US20110232275A1 - Internal combustion engine exhaust cooling system - Google Patents
Internal combustion engine exhaust cooling system Download PDFInfo
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- US20110232275A1 US20110232275A1 US13/053,930 US201113053930A US2011232275A1 US 20110232275 A1 US20110232275 A1 US 20110232275A1 US 201113053930 A US201113053930 A US 201113053930A US 2011232275 A1 US2011232275 A1 US 2011232275A1
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- Prior art keywords
- passage
- exhaust
- coolant
- passages
- arrangement
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P3/12—Arrangements for cooling other engine or machine parts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P2060/00—Cooling circuits using auxiliaries
- F01P2060/16—Outlet manifold
Definitions
- the invention relates to an internal combustion engine exhaust cooling system in which an exhaust gas cooling adapter that is arranged between an exhaust port that opens in a cylinder head and an exhaust branch pipe, and that cools exhaust gas flowing through an exhaust passage by running coolant through a coolant passage formed inside of a wall that surrounds the exhaust passage.
- JP-A-11-49096 JP-A-11-49096
- JP-U-64-15718 JP-U-64-15718
- JP-A-11-49096 a connecting member is provided between a cylinder head and an exhaust branch pipe, and a coolant passage is provided in this connecting member.
- This coolant passage is formed as a concave portion. Coolant introduced from both ends on the lower side of the coolant passage flows directly into the coolant passage on the exhaust branch pipe side.
- a first exhaust gas cooling adapter is arranged between a cylinder head and an exhaust branch pipe, and a second exhaust gas cooling adapter is arranged between the exhaust branch pipe and a turbocharger.
- a coolant passage of the first exhaust gas cooling adapter passes from an inlet provided on a lower side of one end of an arrangement of exhaust passages corresponding to exhaust ports, through the lower side of the arrangement, turns back at the opposite end, and passes through the upper side of the arrangement, and discharges coolant out from an outlet directly above the inlet.
- the exhaust gas that has just come out of the exhaust ports is cooled by the exhaust gas cooling adapter.
- a coolant inlet and a coolant outlet are formed on opposite corners of a cooling passage formed around a single exhaust passage.
- This second exhaust gas cooling adapter runs coolant around the exhaust passage, thus cooling the exhaust gas that has already been cooled by the first exhaust gas cooling adapter.
- Exhaust gas discharged from a combustion chamber of an internal combustion engine via an exhaust port does not flow uniformly through the exhaust passage. That is, the flow of exhaust gas may become uneven or the exhaust gas may bump along due to the shape of the exhaust port, the positional relationship between the exhaust port and an exhaust gas cooling adapter that is connected to the exhaust port, or the shape of the exhaust gas cooling adapter. As a result, a large difference in temperature may occur at the inner surface of the exhaust gas cooling adapter, which may cause the exhaust cooling performance to decrease.
- the concave portion that serves as the coolant passage is provided to supply coolant to the exhaust branch pipe side. Therefore, the shape of the concave portion itself does not sufficiently surround the exhaust passage. Moreover, coolant flows directly out to the exhaust branch pipe side without sufficiently flowing into the concave portion, so the function of cooling the exhaust gas that has been discharged from the exhaust port on the cylinder head side is extremely low. Therefore, this technology does not enable the exhaust passage of the exhaust gas cooling adapter to be efficiently cooled.
- cooling is simply performed a second time in order to protect the turbocharger. Cooling is not aimed at the high temperature exhaust gas from the exhaust port. Moreover, the temperature difference described above is not taken into account, and the flow of coolant is not one that actually addresses the temperature difference.
- the invention thus provides an internal combustion engine exhaust cooling system capable of efficiently cooling an exhaust passage of an exhaust gas cooling adapter without increasing either the size of the exhaust gas cooling adapter or the load on a water-jet pump.
- a first aspect of the invention relates to an internal combustion engine exhaust cooling system that includes an exhaust gas cooling adapter that is arranged between an exhaust port that opens in a cylinder head, and an exhaust branch pipe, and cools exhaust gas that flows through an exhaust passage by running coolant through a coolant passage formed inside of a wall that surrounds the exhaust passage.
- the exhaust gas cooling adapter includes a coolant inlet that introduces coolant into the coolant passage, and a coolant outlet that discharges coolant outside from the coolant passage.
- the coolant passage includes a first passage that is on a high heat receiving side and a second passage that is on a low heat receiving side, the first passage and the second passage being provided according to an offset of an amount of heat received from exhaust gas in a circumferential direction of an inner surface of the exhaust passage, and two middle passages that connect the first passage with the second passage at both ends of the two middle passages.
- a coolant delivery direction of the coolant inlet is a direction from the second passage side of a first middle passage, of the two middle passages, toward the first passage side.
- the coolant outlet discharges coolant from a location where a second middle passage, of the two middle passages, is connected with the first passage, or from near the location.
- coolant that is delivered from the coolant inlet to the coolant passage immediately heads from the second passage side of the first middle passage, of the two middle passages, toward the first passage side.
- the pressure of the coolant delivered from the coolant inlet is sufficiently transmitted to the first passage, while little coolant pressure is transmitted to the second passage.
- coolant flows faster in the first passage than it does in the second passage.
- the flow rate of coolant that flows through the coolant passage is greater in the first passage and smaller in the second passage, so the temperature at the exhaust passage portion on the first passage side that tends to increase can be inhibited from increasing.
- the exhaust passage portion on the second passage side essentially tends not to increase in temperature, so the temperature is able to be inhibited from increasing even if the coolant flow rate is reduced.
- the exhaust passage of the exhaust gas cooling adapter can be efficiently cooled without increasing the total coolant flow rate, so the exhaust gas cooling adapter will not become larger and the load on the water-jet pump will not increase.
- a second aspect of the invention relates to an internal combustion engine exhaust cooling system that includes an exhaust gas cooling adapter that is arranged between an exhaust port that opens in a cylinder head, and an exhaust branch pipe, and cools exhaust gas that flows through an exhaust passage by running coolant through a coolant passage formed inside of a wall that surrounds the exhaust passage.
- the exhaust gas cooling adapter includes a coolant inlet that introduces coolant into the coolant passage, and a coolant outlet that discharges coolant outside from the coolant passage.
- the coolant passage includes an outside passage of a curve and an inside passage of a curve that are provided according to a curve in an exhaust flow produced by a curved shape of the exhaust port, and two middle passages that connect the outside passage with the inside passage at both ends of the two middle passages.
- a coolant delivery direction of the coolant inlet is a direction from the inside passage side of a first middle passage, of the two middle passages, toward the outside passage side.
- the coolant outlet discharges coolant from a location where a second middle passage, of the two middle passages, is connected with the outside passage, or from near the location.
- coolant that is delivered from the coolant inlet to the coolant passage immediately heads from the inside passage side of the first middle passage, of the two middle passages, toward the outside passage side.
- the pressure of the coolant delivered from the coolant inlet is sufficiently transmitted to the first passage, while little coolant pressure is transmitted to the inside passage.
- coolant flows faster in the outside passage than it does in the inside passage, so the flow rate of coolant that flows through the coolant passage is greater in the outside passage and smaller in the inside passage.
- the exhaust port is curved, so a curve is produced in the exhaust flow until the exhaust gas reaches the exhaust gas cooling adapter. Therefore, in the exhaust gas cooling adapter, the inner surface of the exhaust passage that corresponds to the outside of the curve of the exhaust flow tends to increase in temperature due to the fast exhaust flow and the exhaust gas striking it.
- the coolant flow rate is greater in the outside passage, that is a coolant passage that corresponds to an exhaust passage inner surface that tends to increase in temperature, than it is in the inside passage, so an increase in temperature at the exhaust passage portion that tends to increase in temperature can be suppressed.
- the exhaust passage portion that corresponds to the inside passage essentially tends not to increase in temperature, so the temperature is able to be inhibited from increasing even if the coolant flow rate is reduced.
- the exhaust passage of the exhaust gas cooling adapter can be efficiently cooled without increasing the total coolant flow rate, so the exhaust gas cooling adapter will not become larger and the load on the water-jet pump will not increase.
- a third aspect of the invention relates to an internal combustion engine exhaust cooling system that includes an exhaust gas cooling adapter that is arranged between an exhaust port that opens in a cylinder head, and an exhaust branch pipe, and cools exhaust gas that flows through an exhaust passage by running coolant through a coolant passage formed inside of a wall that surrounds the exhaust passage.
- the exhaust gas cooling adapter includes a coolant inlet that introduces coolant into the coolant passage, and a coolant outlet that discharges coolant outside from the coolant passage.
- the coolant passage includes an outside passage of a curve and an inside passage of a curve that are provided according to a curve in an exhaust flow produced by a bent shape of a connecting portion between the exhaust port and the exhaust passage, and two middle passages that connect the outside passage with the inside passage at both ends of the two middle passages.
- a coolant delivery direction of the coolant inlet is a direction from the inside passage side of a first middle passage, of the two middle passages, toward the outside passage side.
- the coolant outlet discharges coolant from a location where a second middle passage, of the two middle passages, is connected with the outside passage, or from near the location.
- coolant that is delivered from the coolant inlet to the coolant passage immediately heads from the inside passage side of the first middle passage, of the two middle passages, toward the outside passage side.
- the pressure of the coolant delivered from the coolant inlet is sufficiently transmitted to the outside passage, while little coolant pressure is transmitted to the inside passage.
- coolant flows faster in the outside passage than it does in the inside passage, so the flow rate of coolant that flows through the coolant passage is greater in the outside passage and smaller in the inside passage.
- the connecting portion of the exhaust port on the cylinder head side and the exhaust passage of the exhaust gas cooling adapter is bent, so a curve is produced in the exhaust flow until the exhaust gas reaches the exhaust gas cooling adapter. Therefore, in the exhaust gas cooling adapter, the inner surface of the exhaust passage that corresponds to the outside of the curve of the exhaust flow tends to increase in temperature due to the fast exhaust flow and the exhaust gas striking it.
- the coolant flow rate is greater in the outside passage, that is a coolant passage that corresponds to an exhaust passage inner surface that tends to increase in temperature, than it is in the inside passage, so an increase in temperature at the exhaust passage portion that tends to increase in temperature can be suppressed.
- the exhaust passage portion that corresponds to the inside passage essentially tends not to increase in temperature, so the temperature is able to be inhibited from increasing even if the coolant flow rate is reduced.
- the exhaust passage of the exhaust gas cooling adapter can be efficiently cooled without increasing the total coolant flow rate, so the exhaust gas cooling adapter will not become larger and the load on the water-jet pump will not increase.
- the coolant outlet may discharge coolant in the same direction as a flow direction of coolant in the first passage.
- the coolant outlet is a passage that discharges coolant in the same direction as the flow direction of coolant in the first passage. Therefore, the flow direction of coolant that has flowed through the first passage at a fast rate does not change when the coolant flows out to the coolant outlet. As a result, the flow resistance does not increase when coolant is discharged from the coolant passage, so the fast coolant flow of the first passage is not impeded. Therefore, the coolant flows more smoothly, which further increases the effects of suppressing the exhaust gas cooling adapter from becoming larger and suppressing the load on the water-jet pump from increasing.
- the coolant outlet may discharge coolant in the same direction as a flow direction of coolant in the outside passage.
- the coolant outlet is a passage that discharges coolant in the same direction as the flow direction of coolant in the outside passage. Therefore, the flow direction of coolant that has flowed through the outside passage at a fast rate does not change when the coolant flows out to the coolant outlet. As a result, the flow resistance does not increase when coolant is discharged from the coolant passage, so the fast coolant flow of the outside passage is not impeded. Therefore, the coolant flows more smoothly, which further increases the effects of suppressing the exhaust gas cooling adapter from becoming larger and suppressing the load on the water-jet pump from increasing.
- a plurality of the exhaust ports may be provided, and each of the plurality of exhaust ports may be arranged and open in a cylinder head.
- a plurality of the exhaust passages may be formed in an arrangement inside the exhaust gas cooling adapter, the arrangement of the plurality of exhaust passages corresponding to an arrangement of the plurality of exhaust ports.
- the exhaust ports may be formed curved in a direction orthogonal to an arrangement direction of the exhaust passages, or the exhaust ports and the exhaust passages may be connected bent in a direction orthogonal to the arrangement direction.
- each of the exhaust ports in the cylinder head and the exhaust passages of the exhaust gas cooling adapter are arranged (i.e., aligned), and, as described above, the exhaust ports are formed curved in a direction orthogonal to the arrangement direction, or the exhaust ports and the exhaust passages are connected bent in a direction orthogonal to the arrangement direction.
- the first passage or the outside passage, and the second passage or the inside passage are formed along the arrangement direction, as described above.
- the coolant flow rate is increased on the side that tends to increase in temperature, and the coolant flow rate is suppressed on the side that tends not to increase in temperature, as described above.
- the exhaust passage of the exhaust gas cooling adapter can be efficiently cooled without increasing the total coolant flow rate, so the exhaust gas cooling adapter will not become larger and the load on the water-jet pump will not increase.
- a plurality of the exhaust ports may be provided, and each of the plurality of exhaust ports may be arranged and open in a cylinder head.
- a plurality of the exhaust passages may be formed in an arrangement inside the exhaust gas cooling adapter, the arrangement of the plurality of exhaust passages corresponding to an arrangement of the plurality of exhaust ports.
- the exhaust ports may be formed curved in a direction orthogonal to an arrangement direction of the exhaust passages, or the exhaust ports and the exhaust passages may be connected bent in a direction orthogonal to the arrangement direction.
- the coolant inlet may deliver coolant from the second passage toward the first passage via a middle passage on one end side in the arrangement direction
- the coolant outlet may discharge coolant from a location where a middle passage on the other end side in the arrangement direction is connected to the first passage, or from near the location.
- each of the exhaust ports in the cylinder head and the exhaust passages of the exhaust gas cooling adapter are arranged (i.e., aligned), and, as described above, the exhaust ports are formed curved in a direction orthogonal to the arrangement direction, or the exhaust ports and the exhaust passages are connected bent in a direction orthogonal to the arrangement direction.
- the first passage and the second passage are formed along the arrangement direction, as described above.
- Arranging the coolant inlet and the coolant outlet in this way with respect to the first passage and the second passage makes it possible to increase the coolant flow rate on the first passage side that tends to increase in temperature, and suppress the coolant flow rate on the second passage side that tends not to increase in temperature, as described above.
- the exhaust passage of the exhaust gas cooling adapter can be efficiently cooled without increasing the total coolant flow rate, so the exhaust gas cooling adapter will not become larger and the load on the water-jet pump will not increase.
- a plurality of the exhaust ports may be provided, and each of the plurality of exhaust ports may be arranged and open in a cylinder head.
- a plurality of the exhaust passages may be formed in an arrangement inside the exhaust gas cooling adapter, the arrangement of the plurality of exhaust passages corresponding to an arrangement of the plurality of exhaust ports.
- the exhaust ports may be formed curved in a direction orthogonal to an arrangement direction of the exhaust passages, or the exhaust ports and the exhaust passages may be connected bent in a direction orthogonal to the arrangement direction.
- the coolant inlet may deliver coolant from the inside passage toward the outside passage via a middle passage on one end side in the arrangement direction
- the coolant outlet may discharge coolant from a location where a middle passage on the other end side in the arrangement direction is connected to the outside passage, or from near the location.
- each of the exhaust ports in the cylinder head and the exhaust passages of the exhaust gas cooling adapter are arranged (i.e., aligned), and, as described above, the exhaust ports are formed curved in a direction orthogonal to the arrangement direction, or the exhaust ports and the exhaust passages are connected bent in a direction orthogonal to the arrangement direction.
- the outside passage and the inside passage are formed along the arrangement direction, as described above.
- Arranging the coolant inlet and the coolant outlet in this way with respect to the outside passage and the inside passage makes it possible to increase the coolant flow rate on the outside passage side that tends to increase in temperature, and suppress the coolant flow rate on the inside passage side that tends not to increase in temperature, as described above.
- the exhaust passage of the exhaust gas cooling adapter can be efficiently cooled without increasing the total coolant flow rate, so the exhaust gas cooling adapter will not become larger and the load on the water-jet pump will not increase.
- the arrangement direction of the exhaust ports in the cylinder head may be a horizontal direction, and the direction orthogonal to the arrangement direction may be vertically downward.
- the coolant flow rate in the coolant passage provided on the vertically upper side and extending in the arrangement direction inside the exhaust gas cooling adapter i.e., the first passage or the outside passage
- the coolant flow rate in the coolant passage provided on the vertically lower side and extending in the arrangement direction i.e., the second passage or the inside passage
- the exhaust passage of the exhaust gas cooling adapter can be efficiently cooled without increasing the total coolant flow rate, so the exhaust gas cooling adapter will not become larger and the load on the water-jet pump will not increase.
- a flow direction guide that guides a flow of coolant delivered from the coolant inlet to a first middle passage, of the two middle passages, may be provided in the coolant passage, in a location near the coolant inlet.
- the flow direction guide that guides the flow of coolant to an appropriate middle passage may be provided in the coolant passage. Doing so makes it easy to appropriately split the flow of the coolant between the first passage and the second passage or between the outside passage and the inside passage, such that the flow rate becomes larger in the first passage or the outside passage.
- FIG. 1 is a longitudinal sectional view of an internal combustion engine exhaust cooling system according to a first example embodiment of the invention
- FIGS. 2A and 2B are perspective views of an exhaust gas cooling adapter used in the internal combustion engine exhaust cooling system
- FIGS. 3A , 3 B, and 3 C are views of the structure of the exhaust gas cooling adapter used in the internal combustion engine exhaust cooling system
- FIGS. 4A , 4 B, and 4 C are views of the structure of the exhaust gas cooling adapter used in the internal combustion engine exhaust cooling system
- FIGS. 5A and 5B are views of the spatial configuration of the water jacket inside the exhaust gas cooling adapter used in the internal combustion engine exhaust cooling system
- FIGS. 6A , 6 B, and 6 C are sectional views of an exhaust gas cooling adapter used in an internal combustion engine exhaust cooling system according to a second example embodiment of the invention.
- FIGS. 7A and 7B are sectional views of exhaust gas cooling adapters used in internal combustion engine exhaust cooling systems according to other example embodiments of the invention.
- FIG. 1 is a longitudinal sectional view of the structure of an exhaust cooling system 4 in an exhaust system of an internal combustion engine 2 according to an example embodiment of the invention.
- This internal combustion engine 2 is a V-type 6 cylinder gasoline engine mounted in a vehicle, and has two banks, one arranged on the left and one arranged on the right, with a bank angle of 60°.
- FIG. 1 shows the exhaust cooling system 4 of the right bank 6 .
- Intake air and fuel are introduced as an air-fuel mixture into a combustion chamber 6 b of a cylinder 6 a in the right bank 6 via an intake port 8 and an intake valve 10 from an intake system during an intake stroke.
- the air-fuel mixture is compressed by a piston 6 c during a compression stroke, and ignited and combusted by a spark plug 6 d during a combustion stroke.
- gas inside the combustion chamber 6 b is discharged as exhaust gas to the exhaust system by opening an exhaust valve 12 during an exhaust stroke.
- Exhaust gas is also discharged to the exhaust system during the exhaust stroke from the other two cylinders of the right bank 6 and the three cylinders of the left bank as well.
- the exhaust system for the right bank 6 side includes an exhaust port 16 (i.e., a total of three exhaust ports for all of the cylinders of the right bank 6 ) formed in a cylinder head 14 , an exhaust gas cooling adapter 18 that is connected to the cylinder head 14 at the opening of the exhaust port 16 , and an exhaust branch pipe 20 that is connected to the exhaust gas cooling adapter 18 .
- an exhaust gas control catalyst and the like are provided downstream in the exhaust system of the right bank 6 .
- the exhaust system of the left bank similarly includes a total of three exhaust ports formed in the cylinder head, an exhaust gas cooling adapter, and an exhaust branch pipe.
- the exhaust gas cooling adapter of the left bank has the same structure as the exhaust gas cooling adapter 18 of the right bank 6 .
- the positional relationship of the axis with the exhaust port side, the angle at which it is mounted to the cylinder head, or the length or curved shape or the like may be different.
- FIGS. 2 to 4 are views of the structure of the exhaust gas cooling adapter 18 of the exhaust system of the right bank 6 .
- FIG. 2A is a perspective view from an exhaust inlet 22 side
- FIG. 2B is a perspective view from an exhaust outlet 24 side.
- FIG. 3A is a plan view
- FIG. 3B is a front view
- FIG. 3C is a bottom view.
- FIG. 4A is a left side view
- FIG. 4B is a right side view
- FIG. 4C is a rear view.
- the spatial configuration of a water jacket 34 on the inside is indicated by the broken line.
- the exhaust gas cooling adapter 18 is arranged between the exhaust port 16 that opens in the cylinder head 14 of the right bank 6 and the exhaust branch pipe 20 , as shown in FIG. 1 .
- the exhaust gas cooling adapter 18 cools exhaust gas discharged from the exhaust port 16 and discharges the cooled exhaust gas to the exhaust branch pipe 20 side, thereby inhibiting heat damage to the exhaust system of the right bank 6 .
- This kind of exhaust gas cooling adapter 18 is molded out of metal material such as aluminum alloy or iron alloy, for example, and has a cylinder head side connecting surface 28 with an open exhaust inlet 22 formed on the exhaust upstream side. Three of these exhaust inlets 22 are provided arranged in a straight line, corresponding to the position and number of the exhaust ports 16 of the cylinder head 14 of the right bank 6 .
- an exhaust branch pipe side connecting surface 30 with an open exhaust outlet 24 is formed on the exhaust downstream side.
- Three of these exhaust outlets 24 are provided arranged in a straight line, corresponding to the exhaust inlets 22 .
- Each exhaust inlet 22 is connected to a corresponding exhaust outlet 24 by a corresponding exhaust passage 32 formed inside the exhaust gas cooling adapter 18 .
- Bolt fastening portions 28 a for fastening the exhaust gas cooling adapter 18 itself to an adapter connecting surface 14 a on the cylinder head 14 side with bolts are formed on the exhaust gas cooling adapter 18 at peripheral portions of the cylinder head side connecting surface 28 .
- the exhaust gas cooling adapter 18 is fixed to the cylinder head 14 by inserting bolts into bolt insertion holes 28 b formed in the bolt fastening portions 28 a and screwing them into threaded holes in the adapter connecting surface 14 a on the cylinder head 14 side.
- the exhaust port 16 on the cylinder head 14 side can be connected with the exhaust passage 32 on the exhaust gas cooling adapter 18 side.
- bolt fastening portions 30 a for fastening the exhaust branch pipe 20 with bolts are formed on the exhaust gas cooling adapter 18 at peripheral portions of the exhaust branch pipe side connecting surface 30 .
- Threaded holes 30 b are formed in these bolt fastening portions 30 a .
- the exhaust branch pipe 20 is connected by screwing in bolts through insertion holes formed in flanges 20 a on the exhaust branch pipe 20 side.
- the exhaust passage 32 on the exhaust gas cooling adapter 18 side can be connected with the exhaust passage 20 b on the exhaust branch pipe 20 side.
- FIGS. 5A and 5B are views of the spatial configuration of the water jacket 34 inside the exhaust gas cooling adapter 18 .
- FIGS. 5A and 5A is a perspective view from the exhaust inlet 22 side
- FIGS. 5A and 5B is a perspective view from the exhaust outlet 24 side.
- a coolant introducing portion 36 is provided on the vertically lower side of the water jacket 34 on the exhaust gas cooling adapter 18
- a coolant discharging portion 38 is provided on the vertically upper side of the water jacket 34 in the exhaust gas cooling adapter 18 .
- Coolant is introduced into the water jacket 34 from a coolant inlet 36 a formed in the coolant introducing portion 36 , and after flowing through the water jacket 34 , is discharged to an external coolant circulation path via a coolant outlet 38 a formed in the coolant discharging portion 38 , as shown by the arrows in FIGS. 5A and 5B .
- the axis X 1 of the exhaust port 16 is at an angle ⁇ to the axis X 2 of the exhaust passage 32 .
- the axes X 1 and X 2 crossing each other, they may also be non-crossing and non-parallel by an angle ⁇ .
- the axis X 2 of the exhaust passage 32 is bent vertically downward at an angle ⁇ with respect to the axis X 1 of the exhaust port 16 . Therefore, the inner peripheral surface 32 a on the vertically upper side of the exhaust passage 32 forms an area that slopes toward the exhaust port 16 .
- the inner peripheral surface 32 b on the vertically lower side is not an area that slopes toward the exhaust port 16 , but instead slopes in the opposite direction, i.e., away from the exhaust port 16 .
- the inner peripheral surface 32 a on the vertically upper side of the exhaust passage 32 has a shape that slopes toward the exhaust port 16 . Therefore, exhaust gas that has been introduced from the exhaust port 16 into the exhaust passage 32 of the exhaust gas cooling adapter 18 strikes the inner peripheral surface 32 a on the vertically upper side comparatively harder than it strikes the inner peripheral surface 32 b on the vertically lower side.
- the exhaust port 16 extends in a curved shape from the combustion chamber 6 b to the exhaust gas cooling adapter 18 , and the vertically upper side is on the outside of the curve. Therefore, high temperature exhaust flows faster at the inner peripheral surface 32 a on the vertically upper side than it does at the inner peripheral surface 32 b on the vertically lower side, so high temperature exhaust gas strikes the inner peripheral surface 32 a on the vertically upper side hard.
- the inner peripheral surface 32 a on the vertically upper side receives a particularly large amount of heat. That is, the inner peripheral surface 32 a on the vertically upper side is a high heat receiving side and the inner peripheral surface 32 b on the vertically lower side is a low heat receiving side.
- the position where coolant is introduced at the coolant inlet 36 a is a position, near the coolant passage 34 b , of the coolant passage 34 d that communicates the coolant passage 34 b on the vertically lower side with the coolant passage 34 a on the vertically upper side on one end side of the exhaust passages 32 in the direction in which the exhaust passages 32 are arranged (also simply referred to as the “arrangement direction”).
- the coolant inlet 36 a delivers coolant toward the coolant passage 34 a on the vertically upper side from a position on the coolant passage 34 b side that is on the vertically lower side.
- the direction in which coolant is delivered from the coolant inlet 36 a is the direction from the coolant passage 34 b side of the coolant passage 34 d , that is one of the middle passages, toward the coolant passage 34 a side.
- the coolant passage 34 b is on the vertically lower side and is a passage on the inside of the curve of the exhaust flow that follows the curve of the exhaust port 16 (the coolant passage 34 b may also be referred to as an “inside passage” in this specification).
- the coolant passage 34 a is on the vertically upper side and is a passage on the outside of the curve of the exhaust flow (the coolant passage 34 a may also be referred to as an “outside passage” in this specification).
- the direction in which coolant is delivered from the coolant inlet 36 a is the direction from the coolant passage 34 b side of the coolant passage 34 d , that is one of the middle passages, toward the coolant passage 34 a side.
- the coolant passage 34 b is on the vertically lower side and is a passage on the inside of the curve of the exhaust flow that follows the bend at the connection of the exhaust port 16 and the exhaust passage 32 (the coolant passage 34 b may also be referred to as an “inside passage” in this specification).
- the coolant passage 34 a is on the vertically upper side and is a passage on the outside of the curve of the exhaust flow (the coolant passage 34 a may also be referred to as an “outside passage” in this specification).
- coolant flows faster through the coolant passage 34 a that is the outside passage than it does through the coolant passage 34 b that is the inside passage.
- the exhaust port 16 is curved in a direction orthogonal to the arrangement direction thereof. Moreover, the connecting portion of the exhaust port 16 and the exhaust passage 32 of the exhaust gas cooling adapter 18 that is connected to the exhaust port 16 is bent in a direction orthogonal to the arrangement direction. The curve and the bend are both vertically downward. In accordance with this, the exhaust flow is in a direction that is orthogonal to the arrangement direction, and curves vertically downward.
- the coolant passage 34 a that is formed in the arrangement direction in the exhaust gas cooling adapter 18 and arranged on the vertically upper side functions as a first passage and an outside passage that corresponds to the inner peripheral surface 32 a on the high heat receiving side of the exhaust passage 32 .
- the coolant passage 34 b that is formed in the arrangement direction and arranged on the vertically lower side functions as a second passage and an inside passage that corresponds to the inner peripheral surface 32 b on the low heat receiving side of the exhaust passage 32 .
- the two coolant passages 34 d and 34 e that connect these coolant passages 34 a and 34 b together at the both ends function as middle passages.
- the flow direction of coolant delivered from the coolant inlet 36 a into the water jacket 34 is toward the coolant passage 34 a side. Therefore, as shown by the arrows in FIGS. 5A and 5B , the main stream of the coolant flows through the coolant passage 34 d that is the first middle passage of the two middle passages (i.e., coolant passages 34 d and 34 e ) from the coolant passage 34 b side toward the coolant passage 34 a side. Accordingly, the amount (i.e., the flow rate) of coolant that flows toward the coolant passage 34 b is small.
- the coolant passage 34 d is located closer to the coolant inlet 36 than the coolant passage 34 e is.
- the pressure of the coolant delivered from the coolant inlet 36 a is sufficiently transmitted to the coolant passage 34 a , while little coolant pressure is transmitted to the coolant passage 34 b .
- coolant flows faster in the coolant passage 34 a than it does in the coolant passage 34 b .
- the flow rate of coolant that flows through the water jacket 34 is greater in the coolant passage 34 a and smaller in the coolant passage 34 b , so the temperature at the inner peripheral surface 32 a on the vertically upper side of the exhaust passage 32 that tends to increase can be inhibited from increasing. Therefore, resistance to boiling at the coolant passage 34 a as a result of heat transfer from the inner peripheral surface 32 a can also be improved.
- the inner peripheral surface 32 b on the vertically lower side essentially tends not to increase in temperature, so the temperature is able to be inhibited from increasing even if the coolant flow rate in the corresponding coolant passage 34 b is reduced. In this way, the exhaust passage 32 of the exhaust gas cooling adapter 18 can be efficiently cooled without increasing the total flow rate of coolant that flows through the water jacket 34 , so the exhaust gas cooling adapter 18 will not become larger and the load on the water-jet pump will not increase.
- the coolant outlet 38 a is a passage that discharges coolant in the same direction as the direction in which coolant flows (i.e., the flow direction of coolant) in the coolant passage 34 a . Therefore, as shown by the arrows in FIGS. 5A and 5B , the flow direction of coolant that has flowed through the coolant passage 34 a at a fast rate does not change when the coolant flows out to the coolant outlet 38 a . As a result, the flow resistance does not increase when the coolant flows out of the coolant passage 34 a , so the fast coolant flow of the coolant passage 34 a is not impeded.
- the coolant flows more smoothly, which further increases the effects of suppressing the exhaust gas cooling adapter 18 from becoming larger and suppressing the load on the water-jet pump from increasing.
- FIG. 6 is a sectional view of exhaust gas cooling adapters 118 , 218 , and 318 used in an exhaust cooling system according to a second example embodiment of the invention.
- the other structure of the exhaust cooling system is the same as it is in the first example embodiment described above.
- a coolant inlet 136 a of a coolant introducing portion 136 that introduces coolant into a water jacket 134 opens into a coolant passage 134 b (that functions as a second passage and an inside passage) that is arranged on the vertically lower side and extends in the direction in which exhaust passages 132 are arranged (i.e., in the arrangement direction of the exhaust passages 132 ), and delivers coolant into this coolant passage 134 b.
- a flow direction guide 136 b is formed on a side of an edge portion of a portion of the coolant inlet 136 a that opens to the coolant passage 134 b side, that is opposite a coolant passage 134 d (that functions as a middle passage) side.
- a tip end of this flow direction guide 136 b points toward the coolant passage 134 d side. Therefore, the pressure of the coolant that has been introduced from the coolant inlet 136 a into the coolant passage 134 b is directed toward the coolant passage 134 d side by the flow direction guide 136 b.
- the main stream of the coolant flows toward the coolant passage 134 d side, and the flow rate of this coolant is large.
- the flow rate of the coolant that flows through the coolant passage 134 b toward the side with a coolant passage 134 e that is a middle passage on the opposite side is small.
- the flow of the coolant (i.e., the coolant pressure) in the coolant passage 134 d turns directly into the flow in a coolant passage 134 a (that functions as a first passage and an outside passage) that is arranged on the vertically upper side and extends in the direction in which the exhaust passages 132 are arranged (i.e., the arrangement direction of the exhaust passages 132 ), and then flows to a coolant discharging portion 138 .
- a coolant passage 134 a that functions as a first passage and an outside passage
- the direction of a coolant outlet 138 a of the coolant discharging portion 138 is the same as the direction of the coolant passage 134 a , so the coolant also flows inside the coolant outlet 138 a without losing any pressure, and is discharged outside as it is from the coolant outlet 138 a.
- a coolant inlet 236 a of a coolant introducing portion 236 that introduces coolant into a water jacket 234 opens into a coolant passage 234 b (that functions as a second passage and an inside passage) that is arranged on the vertically lower side and extends in the direction in which exhaust passages 232 are arranged (i.e., in the arrangement direction of the exhaust passages 232 ), and delivers the coolant into this coolant passage 234 b , similar to FIG. 6A .
- a flow direction guide 236 b is formed on a wall portion side of an opposing exhaust passage 232 , instead of on an edge portion of the coolant inlet 236 a .
- a tip end of this flow direction guide 236 b is formed pointed toward an edge portion of the coolant inlet 236 a , that is on the side opposite a coolant passage 234 d (that functions as a middle passage) side.
- the pressure of the coolant that has been introduced from the coolant inlet 236 a into the coolant passage 234 b is directed toward the coolant passage 234 d side by the sloped surface of the flow direction guide 236 b .
- the main stream of the coolant flows toward the coolant passage 234 d side, and the flow rate of this coolant is large.
- the flow rate of the coolant that flows through the coolant passage 234 b toward the side with a coolant passage 234 e that is a middle passage on the opposite side is small.
- the flow of the coolant (i.e., the coolant pressure) in this coolant passage 234 d turns directly into the flow in a coolant passage 234 a (that functions as a first passage and an outside passage) that is arranged on the vertically upper side and extends in the direction in which the exhaust passages 232 are arranged (i.e., the arrangement direction of the exhaust passages 232 ), and then flows to a coolant discharging portion 238 .
- a coolant passage 234 a that functions as a first passage and an outside passage
- the direction of a coolant outlet 238 a of the coolant discharging portion 238 is the same as the direction of the coolant passage 234 a , so the coolant flows without losing any pressure, and is discharged outside as it is from the coolant outlet 238 a.
- a coolant inlet 336 a of a coolant introducing portion 336 that introduces coolant into a water jacket 334 opens into a coolant passage 334 b (that functions as a second passage and an inside passage) that is arranged on the vertically lower side and extends in the direction in which exhaust passages 332 are arranged (i.e., in the arrangement direction of the exhaust passages 332 ), and delivers the coolant into this coolant passage 334 b .
- a coolant passage 334 b that functions as a second passage and an inside passage
- the coolant inlet 336 a of the coolant introducing portion 336 is farther away from a coolant passage 334 d (that functions as a middle passage) and is provided in a position facing a coolant passage 334 c that connects a coolant passage 334 a (that functions as a first passage and an outside passage) with the coolant passage 334 b at a center portion.
- a flow direction guide 336 b that is formed on an opening edge portion of a coolant inlet 336 a on the side opposite the coolant passage 334 d (that functions as a middle passage) is formed longer and extending toward the coolant passage 334 d side, such that sufficient coolant pressure reliably reaches the coolant passage 334 d.
- the main stream of the coolant flows toward the coolant passage 334 d side, and the flow rate of this coolant is large.
- the flow rate of the coolant that flows through the coolant passage 334 b toward the side with a coolant passage 334 e that is a middle passage on the opposite side is small.
- the flow of the coolant (i.e., the coolant pressure) in the coolant passage 334 d turns directly into the flow in a coolant passage 334 a that is arranged on the vertically upper side and extends in the direction in which the exhaust passages 332 are arranged (i.e., in the arrangement direction of the exhaust passages 332 ), and then flows to a coolant discharging portion 338 .
- the direction of a coolant outlet 338 a of the coolant discharging portion 338 is the same as the direction of the coolant passage 334 a , so the coolant flows without losing any pressure, and is discharged outside as it is from the coolant outlet 338 a.
- the main flow of coolant is able to be directed toward the coolant passage 134 a , 234 a , or 334 a via the coolant passage 134 d , 234 d , or 334 d by the flow direction guide 136 b , 236 b , or 336 b also when the coolant introducing portion 136 , 236 , or 336 is mounted on the coolant passage 134 b , 234 b , or 334 b side in this way.
- the coolant inlet 436 a of a coolant introducing portion 436 when connected to a coolant passage 434 b that functions as a second passage and an inside passage, the coolant inlet 436 a may be formed at an angle such that the main stream of coolant is directed toward a coolant passage 434 d that is a middle passage, instead of using a flow direction guide.
- the flow of the coolant (i.e., the coolant pressure) in the coolant passage 434 d turns directly into the flow in a coolant passage 434 a that functions as a first passage and an outside passage, and then flows to a coolant discharging portion 438 .
- the coolant then flows without losing any pressure, and is discharged outside as it is from a coolant outlet 438 a .
- This structure also enables effects similar to those obtained in the first example embodiment to be obtained.
- the direction of the coolant outlet of the coolant discharging portion follows the flow direction of coolant in the coolant passage that functions as the first passage and the outside passage.
- the direction of a coolant outlet 538 a of a coolant discharging portion 538 may be a direction that is different from the flow direction of coolant in a coolant passage 534 a that functions as a first passage and an outside passage, as shown in FIG. 7B .
- the direction of the coolant outlet 538 a is a direction that is orthogonal to the flow direction of coolant in the coolant passage 534 a .
- FIG. 1 is a view of an example in which the invention is applied to a V-type 6 cylinder internal combustion engine.
- the invention may also be applied to an engine having in-line configuration, as well as to an engine with a number of cylinders other than six, such as four cylinders or eight cylinders or the like.
Abstract
An internal combustion engine exhaust cooling system includes an exhaust gas cooling adapter that is arranged between an exhaust port that opens in a cylinder head, and an exhaust branch pipe, and cools exhaust gas that flows through an exhaust passage by running coolant through a coolant passage formed inside of a wall that surrounds the exhaust passage. The coolant passage includes a first passage and a second passage being provided according to an offset of an amount of heat received from exhaust gas in a circumferential direction of an inner surface of the exhaust passage, and two middle passages that connect the first passage with the second passage at both ends of the two middle passages, and a coolant delivery direction is a direction from the second passage side of a first middle passage, of the two middle passages, toward the first passage side.
Description
- This application claims priority to Japanese Patent Application No. 2010-066974 filed on Mar. 23, 2010, which is incorporated herein by reference in its entirety including the specification, drawings and abstract.
- 1. Field of the Invention
- The invention relates to an internal combustion engine exhaust cooling system in which an exhaust gas cooling adapter that is arranged between an exhaust port that opens in a cylinder head and an exhaust branch pipe, and that cools exhaust gas flowing through an exhaust passage by running coolant through a coolant passage formed inside of a wall that surrounds the exhaust passage.
- 2. Description of the Related Art Japanese Patent Application Publication No. 11-49096 (JP-A-11-49096) and Japanese Utility Model Application Publication No. 64-15718 (JP-U-64-15718), for example, describe technologies for cooling exhaust gas in order to suppress heat damage to the internal combustion engine exhaust system. In JP-A-11-49096, a connecting member is provided between a cylinder head and an exhaust branch pipe, and a coolant passage is provided in this connecting member. This coolant passage is formed as a concave portion. Coolant introduced from both ends on the lower side of the coolant passage flows directly into the coolant passage on the exhaust branch pipe side.
- In JP-U-64-15718, a first exhaust gas cooling adapter is arranged between a cylinder head and an exhaust branch pipe, and a second exhaust gas cooling adapter is arranged between the exhaust branch pipe and a turbocharger. A coolant passage of the first exhaust gas cooling adapter passes from an inlet provided on a lower side of one end of an arrangement of exhaust passages corresponding to exhaust ports, through the lower side of the arrangement, turns back at the opposite end, and passes through the upper side of the arrangement, and discharges coolant out from an outlet directly above the inlet. As a result, the exhaust gas that has just come out of the exhaust ports is cooled by the exhaust gas cooling adapter. With the second exhaust gas cooling adapter, a coolant inlet and a coolant outlet are formed on opposite corners of a cooling passage formed around a single exhaust passage. This second exhaust gas cooling adapter runs coolant around the exhaust passage, thus cooling the exhaust gas that has already been cooled by the first exhaust gas cooling adapter.
- Exhaust gas discharged from a combustion chamber of an internal combustion engine via an exhaust port does not flow uniformly through the exhaust passage. That is, the flow of exhaust gas may become uneven or the exhaust gas may bump along due to the shape of the exhaust port, the positional relationship between the exhaust port and an exhaust gas cooling adapter that is connected to the exhaust port, or the shape of the exhaust gas cooling adapter. As a result, a large difference in temperature may occur at the inner surface of the exhaust gas cooling adapter, which may cause the exhaust cooling performance to decrease.
- With the connecting member in JP-A-11-49096, the concave portion that serves as the coolant passage is provided to supply coolant to the exhaust branch pipe side. Therefore, the shape of the concave portion itself does not sufficiently surround the exhaust passage. Moreover, coolant flows directly out to the exhaust branch pipe side without sufficiently flowing into the concave portion, so the function of cooling the exhaust gas that has been discharged from the exhaust port on the cylinder head side is extremely low. Therefore, this technology does not enable the exhaust passage of the exhaust gas cooling adapter to be efficiently cooled.
- With the first exhaust gas cooling adapter in JP-U-64-15718, exhaust gas discharged from the exhaust port of the internal combustion engine is cooled by running coolant uniformly along the entire periphery of the exhaust passage. With such uniform cooling, in order to sufficiently cool the exhaust gas even at a high temperature portion that occurs due to the temperature difference described above, it is necessary to run an overall large amount of coolant inside the water jacket of the first exhaust gas cooling adapter. Such an approach, however, increases the size of the exhaust gas cooling adapter and increases the load on the water-jet pump. As a result, the internal combustion engine may become heavier and less fuel efficient.
- With the second exhaust gas cooling adapter in JP-U-64-15718, cooling is simply performed a second time in order to protect the turbocharger. Cooling is not aimed at the high temperature exhaust gas from the exhaust port. Moreover, the temperature difference described above is not taken into account, and the flow of coolant is not one that actually addresses the temperature difference.
- The invention thus provides an internal combustion engine exhaust cooling system capable of efficiently cooling an exhaust passage of an exhaust gas cooling adapter without increasing either the size of the exhaust gas cooling adapter or the load on a water-jet pump.
- A first aspect of the invention relates to an internal combustion engine exhaust cooling system that includes an exhaust gas cooling adapter that is arranged between an exhaust port that opens in a cylinder head, and an exhaust branch pipe, and cools exhaust gas that flows through an exhaust passage by running coolant through a coolant passage formed inside of a wall that surrounds the exhaust passage. The exhaust gas cooling adapter includes a coolant inlet that introduces coolant into the coolant passage, and a coolant outlet that discharges coolant outside from the coolant passage. The coolant passage includes a first passage that is on a high heat receiving side and a second passage that is on a low heat receiving side, the first passage and the second passage being provided according to an offset of an amount of heat received from exhaust gas in a circumferential direction of an inner surface of the exhaust passage, and two middle passages that connect the first passage with the second passage at both ends of the two middle passages. A coolant delivery direction of the coolant inlet is a direction from the second passage side of a first middle passage, of the two middle passages, toward the first passage side. Also, the coolant outlet discharges coolant from a location where a second middle passage, of the two middle passages, is connected with the first passage, or from near the location.
- With this internal combustion engine exhaust cooling system, in the exhaust gas cooling adapter, coolant that is delivered from the coolant inlet to the coolant passage immediately heads from the second passage side of the first middle passage, of the two middle passages, toward the first passage side.
- As a result, the pressure of the coolant delivered from the coolant inlet is sufficiently transmitted to the first passage, while little coolant pressure is transmitted to the second passage. Thus, coolant flows faster in the first passage than it does in the second passage. As a result, the flow rate of coolant that flows through the coolant passage is greater in the first passage and smaller in the second passage, so the temperature at the exhaust passage portion on the first passage side that tends to increase can be inhibited from increasing. The exhaust passage portion on the second passage side essentially tends not to increase in temperature, so the temperature is able to be inhibited from increasing even if the coolant flow rate is reduced.
- Therefore, the exhaust passage of the exhaust gas cooling adapter can be efficiently cooled without increasing the total coolant flow rate, so the exhaust gas cooling adapter will not become larger and the load on the water-jet pump will not increase.
- A second aspect of the invention relates to an internal combustion engine exhaust cooling system that includes an exhaust gas cooling adapter that is arranged between an exhaust port that opens in a cylinder head, and an exhaust branch pipe, and cools exhaust gas that flows through an exhaust passage by running coolant through a coolant passage formed inside of a wall that surrounds the exhaust passage. The exhaust gas cooling adapter includes a coolant inlet that introduces coolant into the coolant passage, and a coolant outlet that discharges coolant outside from the coolant passage. The coolant passage includes an outside passage of a curve and an inside passage of a curve that are provided according to a curve in an exhaust flow produced by a curved shape of the exhaust port, and two middle passages that connect the outside passage with the inside passage at both ends of the two middle passages. A coolant delivery direction of the coolant inlet is a direction from the inside passage side of a first middle passage, of the two middle passages, toward the outside passage side. Also, the coolant outlet discharges coolant from a location where a second middle passage, of the two middle passages, is connected with the outside passage, or from near the location.
- In this aspect, in the exhaust gas cooling adapter, coolant that is delivered from the coolant inlet to the coolant passage immediately heads from the inside passage side of the first middle passage, of the two middle passages, toward the outside passage side.
- As a result, the pressure of the coolant delivered from the coolant inlet is sufficiently transmitted to the first passage, while little coolant pressure is transmitted to the inside passage. Thus, coolant flows faster in the outside passage than it does in the inside passage, so the flow rate of coolant that flows through the coolant passage is greater in the outside passage and smaller in the inside passage.
- The exhaust port is curved, so a curve is produced in the exhaust flow until the exhaust gas reaches the exhaust gas cooling adapter. Therefore, in the exhaust gas cooling adapter, the inner surface of the exhaust passage that corresponds to the outside of the curve of the exhaust flow tends to increase in temperature due to the fast exhaust flow and the exhaust gas striking it.
- In this internal combustion engine exhaust cooling system, as described above, the coolant flow rate is greater in the outside passage, that is a coolant passage that corresponds to an exhaust passage inner surface that tends to increase in temperature, than it is in the inside passage, so an increase in temperature at the exhaust passage portion that tends to increase in temperature can be suppressed. The exhaust passage portion that corresponds to the inside passage essentially tends not to increase in temperature, so the temperature is able to be inhibited from increasing even if the coolant flow rate is reduced.
- Therefore, the exhaust passage of the exhaust gas cooling adapter can be efficiently cooled without increasing the total coolant flow rate, so the exhaust gas cooling adapter will not become larger and the load on the water-jet pump will not increase.
- A third aspect of the invention relates to an internal combustion engine exhaust cooling system that includes an exhaust gas cooling adapter that is arranged between an exhaust port that opens in a cylinder head, and an exhaust branch pipe, and cools exhaust gas that flows through an exhaust passage by running coolant through a coolant passage formed inside of a wall that surrounds the exhaust passage. The exhaust gas cooling adapter includes a coolant inlet that introduces coolant into the coolant passage, and a coolant outlet that discharges coolant outside from the coolant passage. The coolant passage includes an outside passage of a curve and an inside passage of a curve that are provided according to a curve in an exhaust flow produced by a bent shape of a connecting portion between the exhaust port and the exhaust passage, and two middle passages that connect the outside passage with the inside passage at both ends of the two middle passages. A coolant delivery direction of the coolant inlet is a direction from the inside passage side of a first middle passage, of the two middle passages, toward the outside passage side. Also, the coolant outlet discharges coolant from a location where a second middle passage, of the two middle passages, is connected with the outside passage, or from near the location.
- In this aspect, in the exhaust gas cooling adapter, coolant that is delivered from the coolant inlet to the coolant passage immediately heads from the inside passage side of the first middle passage, of the two middle passages, toward the outside passage side.
- As a result, the pressure of the coolant delivered from the coolant inlet is sufficiently transmitted to the outside passage, while little coolant pressure is transmitted to the inside passage. Thus, coolant flows faster in the outside passage than it does in the inside passage, so the flow rate of coolant that flows through the coolant passage is greater in the outside passage and smaller in the inside passage.
- The connecting portion of the exhaust port on the cylinder head side and the exhaust passage of the exhaust gas cooling adapter is bent, so a curve is produced in the exhaust flow until the exhaust gas reaches the exhaust gas cooling adapter. Therefore, in the exhaust gas cooling adapter, the inner surface of the exhaust passage that corresponds to the outside of the curve of the exhaust flow tends to increase in temperature due to the fast exhaust flow and the exhaust gas striking it.
- In the foregoing aspect, as described above, the coolant flow rate is greater in the outside passage, that is a coolant passage that corresponds to an exhaust passage inner surface that tends to increase in temperature, than it is in the inside passage, so an increase in temperature at the exhaust passage portion that tends to increase in temperature can be suppressed. The exhaust passage portion that corresponds to the inside passage essentially tends not to increase in temperature, so the temperature is able to be inhibited from increasing even if the coolant flow rate is reduced.
- Therefore, the exhaust passage of the exhaust gas cooling adapter can be efficiently cooled without increasing the total coolant flow rate, so the exhaust gas cooling adapter will not become larger and the load on the water-jet pump will not increase.
- In the aspect described above, the coolant outlet may discharge coolant in the same direction as a flow direction of coolant in the first passage.
- Also, the coolant outlet is a passage that discharges coolant in the same direction as the flow direction of coolant in the first passage. Therefore, the flow direction of coolant that has flowed through the first passage at a fast rate does not change when the coolant flows out to the coolant outlet. As a result, the flow resistance does not increase when coolant is discharged from the coolant passage, so the fast coolant flow of the first passage is not impeded. Therefore, the coolant flows more smoothly, which further increases the effects of suppressing the exhaust gas cooling adapter from becoming larger and suppressing the load on the water-jet pump from increasing.
- In the structure described above, the coolant outlet may discharge coolant in the same direction as a flow direction of coolant in the outside passage.
- Also, the coolant outlet is a passage that discharges coolant in the same direction as the flow direction of coolant in the outside passage. Therefore, the flow direction of coolant that has flowed through the outside passage at a fast rate does not change when the coolant flows out to the coolant outlet. As a result, the flow resistance does not increase when coolant is discharged from the coolant passage, so the fast coolant flow of the outside passage is not impeded. Therefore, the coolant flows more smoothly, which further increases the effects of suppressing the exhaust gas cooling adapter from becoming larger and suppressing the load on the water-jet pump from increasing.
- In the aspect described above, a plurality of the exhaust ports may be provided, and each of the plurality of exhaust ports may be arranged and open in a cylinder head. A plurality of the exhaust passages may be formed in an arrangement inside the exhaust gas cooling adapter, the arrangement of the plurality of exhaust passages corresponding to an arrangement of the plurality of exhaust ports. Further, the exhaust ports may be formed curved in a direction orthogonal to an arrangement direction of the exhaust passages, or the exhaust ports and the exhaust passages may be connected bent in a direction orthogonal to the arrangement direction.
- In this way, each of the exhaust ports in the cylinder head and the exhaust passages of the exhaust gas cooling adapter are arranged (i.e., aligned), and, as described above, the exhaust ports are formed curved in a direction orthogonal to the arrangement direction, or the exhaust ports and the exhaust passages are connected bent in a direction orthogonal to the arrangement direction. With this kind of structure, the first passage or the outside passage, and the second passage or the inside passage, are formed along the arrangement direction, as described above.
- Therefore, the coolant flow rate is increased on the side that tends to increase in temperature, and the coolant flow rate is suppressed on the side that tends not to increase in temperature, as described above. As a result, the exhaust passage of the exhaust gas cooling adapter can be efficiently cooled without increasing the total coolant flow rate, so the exhaust gas cooling adapter will not become larger and the load on the water-jet pump will not increase.
- In the aspect described above, a plurality of the exhaust ports may be provided, and each of the plurality of exhaust ports may be arranged and open in a cylinder head. A plurality of the exhaust passages may be formed in an arrangement inside the exhaust gas cooling adapter, the arrangement of the plurality of exhaust passages corresponding to an arrangement of the plurality of exhaust ports. Further, the exhaust ports may be formed curved in a direction orthogonal to an arrangement direction of the exhaust passages, or the exhaust ports and the exhaust passages may be connected bent in a direction orthogonal to the arrangement direction. Also, the coolant inlet may deliver coolant from the second passage toward the first passage via a middle passage on one end side in the arrangement direction, and the coolant outlet may discharge coolant from a location where a middle passage on the other end side in the arrangement direction is connected to the first passage, or from near the location.
- In this way, each of the exhaust ports in the cylinder head and the exhaust passages of the exhaust gas cooling adapter are arranged (i.e., aligned), and, as described above, the exhaust ports are formed curved in a direction orthogonal to the arrangement direction, or the exhaust ports and the exhaust passages are connected bent in a direction orthogonal to the arrangement direction. With this kind of structure, the first passage and the second passage are formed along the arrangement direction, as described above.
- Arranging the coolant inlet and the coolant outlet in this way with respect to the first passage and the second passage makes it possible to increase the coolant flow rate on the first passage side that tends to increase in temperature, and suppress the coolant flow rate on the second passage side that tends not to increase in temperature, as described above. As a result, the exhaust passage of the exhaust gas cooling adapter can be efficiently cooled without increasing the total coolant flow rate, so the exhaust gas cooling adapter will not become larger and the load on the water-jet pump will not increase.
- In the structure described above, a plurality of the exhaust ports may be provided, and each of the plurality of exhaust ports may be arranged and open in a cylinder head. A plurality of the exhaust passages may be formed in an arrangement inside the exhaust gas cooling adapter, the arrangement of the plurality of exhaust passages corresponding to an arrangement of the plurality of exhaust ports. Further, the exhaust ports may be formed curved in a direction orthogonal to an arrangement direction of the exhaust passages, or the exhaust ports and the exhaust passages may be connected bent in a direction orthogonal to the arrangement direction. Also, the coolant inlet may deliver coolant from the inside passage toward the outside passage via a middle passage on one end side in the arrangement direction, and the coolant outlet may discharge coolant from a location where a middle passage on the other end side in the arrangement direction is connected to the outside passage, or from near the location.
- In this way, each of the exhaust ports in the cylinder head and the exhaust passages of the exhaust gas cooling adapter are arranged (i.e., aligned), and, as described above, the exhaust ports are formed curved in a direction orthogonal to the arrangement direction, or the exhaust ports and the exhaust passages are connected bent in a direction orthogonal to the arrangement direction. With this kind of structure, the outside passage and the inside passage are formed along the arrangement direction, as described above.
- Arranging the coolant inlet and the coolant outlet in this way with respect to the outside passage and the inside passage makes it possible to increase the coolant flow rate on the outside passage side that tends to increase in temperature, and suppress the coolant flow rate on the inside passage side that tends not to increase in temperature, as described above. As a result, the exhaust passage of the exhaust gas cooling adapter can be efficiently cooled without increasing the total coolant flow rate, so the exhaust gas cooling adapter will not become larger and the load on the water-jet pump will not increase.
- In the structure described above, the arrangement direction of the exhaust ports in the cylinder head may be a horizontal direction, and the direction orthogonal to the arrangement direction may be vertically downward.
- When the arrangement direction of the exhaust ports in the cylinder head and the exhaust passages of the exhaust gas cooling adapter are set and the direction of the curve of the exhaust flow is set in this way, the coolant flow rate in the coolant passage provided on the vertically upper side and extending in the arrangement direction inside the exhaust gas cooling adapter (i.e., the first passage or the outside passage) is increased. Also, the coolant flow rate in the coolant passage provided on the vertically lower side and extending in the arrangement direction (i.e., the second passage or the inside passage) is suppressed. Therefore, the exhaust passage of the exhaust gas cooling adapter can be efficiently cooled without increasing the total coolant flow rate, so the exhaust gas cooling adapter will not become larger and the load on the water-jet pump will not increase.
- In the aspect described above, a flow direction guide that guides a flow of coolant delivered from the coolant inlet to a first middle passage, of the two middle passages, may be provided in the coolant passage, in a location near the coolant inlet.
- In this way, the flow direction guide that guides the flow of coolant to an appropriate middle passage may be provided in the coolant passage. Doing so makes it easy to appropriately split the flow of the coolant between the first passage and the second passage or between the outside passage and the inside passage, such that the flow rate becomes larger in the first passage or the outside passage.
- The features, advantages, and technical and industrial significance of this invention will be described in the following detailed description of example embodiments of the invention with reference to the accompanying drawings, in which like numerals denote like elements, and wherein:
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FIG. 1 is a longitudinal sectional view of an internal combustion engine exhaust cooling system according to a first example embodiment of the invention; -
FIGS. 2A and 2B are perspective views of an exhaust gas cooling adapter used in the internal combustion engine exhaust cooling system; -
FIGS. 3A , 3B, and 3C are views of the structure of the exhaust gas cooling adapter used in the internal combustion engine exhaust cooling system; -
FIGS. 4A , 4B, and 4C are views of the structure of the exhaust gas cooling adapter used in the internal combustion engine exhaust cooling system; -
FIGS. 5A and 5B are views of the spatial configuration of the water jacket inside the exhaust gas cooling adapter used in the internal combustion engine exhaust cooling system; -
FIGS. 6A , 6B, and 6C are sectional views of an exhaust gas cooling adapter used in an internal combustion engine exhaust cooling system according to a second example embodiment of the invention; and -
FIGS. 7A and 7B are sectional views of exhaust gas cooling adapters used in internal combustion engine exhaust cooling systems according to other example embodiments of the invention. -
FIG. 1 is a longitudinal sectional view of the structure of anexhaust cooling system 4 in an exhaust system of aninternal combustion engine 2 according to an example embodiment of the invention. Thisinternal combustion engine 2 is a V-type 6 cylinder gasoline engine mounted in a vehicle, and has two banks, one arranged on the left and one arranged on the right, with a bank angle of 60°.FIG. 1 shows theexhaust cooling system 4 of the right bank 6. - Intake air and fuel are introduced as an air-fuel mixture into a
combustion chamber 6 b of acylinder 6 a in the right bank 6 via anintake port 8 and anintake valve 10 from an intake system during an intake stroke. The air-fuel mixture is compressed by apiston 6 c during a compression stroke, and ignited and combusted by aspark plug 6 d during a combustion stroke. Then gas inside thecombustion chamber 6 b is discharged as exhaust gas to the exhaust system by opening anexhaust valve 12 during an exhaust stroke. Exhaust gas is also discharged to the exhaust system during the exhaust stroke from the other two cylinders of the right bank 6 and the three cylinders of the left bank as well. - Here, the exhaust system for the right bank 6 side includes an exhaust port 16 (i.e., a total of three exhaust ports for all of the cylinders of the right bank 6) formed in a
cylinder head 14, an exhaustgas cooling adapter 18 that is connected to thecylinder head 14 at the opening of theexhaust port 16, and anexhaust branch pipe 20 that is connected to the exhaustgas cooling adapter 18. Other than these, an exhaust gas control catalyst and the like are provided downstream in the exhaust system of the right bank 6. The exhaust system of the left bank similarly includes a total of three exhaust ports formed in the cylinder head, an exhaust gas cooling adapter, and an exhaust branch pipe. In this example embodiment, the exhaust gas cooling adapter of the left bank has the same structure as the exhaustgas cooling adapter 18 of the right bank 6. However, the positional relationship of the axis with the exhaust port side, the angle at which it is mounted to the cylinder head, or the length or curved shape or the like may be different. -
FIGS. 2 to 4 are views of the structure of the exhaustgas cooling adapter 18 of the exhaust system of the right bank 6.FIG. 2A is a perspective view from anexhaust inlet 22 side, andFIG. 2B is a perspective view from anexhaust outlet 24 side.FIG. 3A is a plan view,FIG. 3B is a front view, andFIG. 3C is a bottom view.FIG. 4A is a left side view,FIG. 4B is a right side view, andFIG. 4C is a rear view. Incidentally, inFIGS. 2A and 2B , the spatial configuration of awater jacket 34 on the inside is indicated by the broken line. - The exhaust
gas cooling adapter 18 is arranged between theexhaust port 16 that opens in thecylinder head 14 of the right bank 6 and theexhaust branch pipe 20, as shown inFIG. 1 . The exhaustgas cooling adapter 18 cools exhaust gas discharged from theexhaust port 16 and discharges the cooled exhaust gas to theexhaust branch pipe 20 side, thereby inhibiting heat damage to the exhaust system of the right bank 6. - This kind of exhaust
gas cooling adapter 18 is molded out of metal material such as aluminum alloy or iron alloy, for example, and has a cylinder headside connecting surface 28 with anopen exhaust inlet 22 formed on the exhaust upstream side. Three of theseexhaust inlets 22 are provided arranged in a straight line, corresponding to the position and number of theexhaust ports 16 of thecylinder head 14 of the right bank 6. - On the exhaust downstream side, an exhaust branch pipe
side connecting surface 30 with anopen exhaust outlet 24 is formed. Three of theseexhaust outlets 24 are provided arranged in a straight line, corresponding to theexhaust inlets 22. Eachexhaust inlet 22 is connected to acorresponding exhaust outlet 24 by a correspondingexhaust passage 32 formed inside the exhaustgas cooling adapter 18. -
Bolt fastening portions 28 a for fastening the exhaustgas cooling adapter 18 itself to anadapter connecting surface 14 a on thecylinder head 14 side with bolts are formed on the exhaustgas cooling adapter 18 at peripheral portions of the cylinder headside connecting surface 28. The exhaustgas cooling adapter 18 is fixed to thecylinder head 14 by inserting bolts into bolt insertion holes 28 b formed in thebolt fastening portions 28 a and screwing them into threaded holes in theadapter connecting surface 14 a on thecylinder head 14 side. As a result, theexhaust port 16 on thecylinder head 14 side can be connected with theexhaust passage 32 on the exhaustgas cooling adapter 18 side. - Moreover,
bolt fastening portions 30 a for fastening theexhaust branch pipe 20 with bolts are formed on the exhaustgas cooling adapter 18 at peripheral portions of the exhaust branch pipeside connecting surface 30. Threadedholes 30 b are formed in thesebolt fastening portions 30 a. Theexhaust branch pipe 20 is connected by screwing in bolts through insertion holes formed inflanges 20 a on theexhaust branch pipe 20 side. As a result, theexhaust passage 32 on the exhaustgas cooling adapter 18 side can be connected with theexhaust passage 20 b on theexhaust branch pipe 20 side. - In this way, a
water jacket 34 is formed around theexhaust passage 32, inside the wall of the exhaustgas cooling adapter 18 that is mounted to theinternal combustion engine 2.FIGS. 5A and 5B are views of the spatial configuration of thewater jacket 34 inside the exhaustgas cooling adapter 18.FIGS. 5A and 5A is a perspective view from theexhaust inlet 22 side, andFIGS. 5A and 5B is a perspective view from theexhaust outlet 24 side. - As shown in
FIGS. 2 to 4 , acoolant introducing portion 36 is provided on the vertically lower side of thewater jacket 34 on the exhaustgas cooling adapter 18, and acoolant discharging portion 38 is provided on the vertically upper side of thewater jacket 34 in the exhaustgas cooling adapter 18. - Coolant is introduced into the
water jacket 34 from acoolant inlet 36 a formed in thecoolant introducing portion 36, and after flowing through thewater jacket 34, is discharged to an external coolant circulation path via acoolant outlet 38 a formed in thecoolant discharging portion 38, as shown by the arrows inFIGS. 5A and 5B . - As a result, the amount of heat transmitted from high temperature exhaust gas via inner
peripheral surfaces FIG. 1 ) of theexhaust passage 32 is absorbed by the coolant flowing throughcoolant passages water jacket 34, thereby cooling the exhaust gas. The cooled exhaust gas is then discharged to theexhaust branch pipe 20 side. - Here, as shown by the alternate long and short dash lines in
FIG. 1 , the axis X1 of theexhaust port 16 is at an angle θ to the axis X2 of theexhaust passage 32. Instead of the axes X1 and X2 crossing each other, they may also be non-crossing and non-parallel by an angle θ. - In this example embodiment, the axis X2 of the
exhaust passage 32 is bent vertically downward at an angle θ with respect to the axis X1 of theexhaust port 16. Therefore, the innerperipheral surface 32 a on the vertically upper side of theexhaust passage 32 forms an area that slopes toward theexhaust port 16. The innerperipheral surface 32 b on the vertically lower side is not an area that slopes toward theexhaust port 16, but instead slopes in the opposite direction, i.e., away from theexhaust port 16. - In this way, the inner
peripheral surface 32 a on the vertically upper side of theexhaust passage 32 has a shape that slopes toward theexhaust port 16. Therefore, exhaust gas that has been introduced from theexhaust port 16 into theexhaust passage 32 of the exhaustgas cooling adapter 18 strikes the innerperipheral surface 32 a on the vertically upper side comparatively harder than it strikes the innerperipheral surface 32 b on the vertically lower side. - Moreover, the
exhaust port 16 extends in a curved shape from thecombustion chamber 6 b to the exhaustgas cooling adapter 18, and the vertically upper side is on the outside of the curve. Therefore, high temperature exhaust flows faster at the innerperipheral surface 32 a on the vertically upper side than it does at the innerperipheral surface 32 b on the vertically lower side, so high temperature exhaust gas strikes the innerperipheral surface 32 a on the vertically upper side hard. Thus, the innerperipheral surface 32 a on the vertically upper side receives a particularly large amount of heat. That is, the innerperipheral surface 32 a on the vertically upper side is a high heat receiving side and the innerperipheral surface 32 b on the vertically lower side is a low heat receiving side. - In this kind of flow state, high temperature exhaust gas transfers heat to the inner
peripheral surfaces exhaust passage 20 b on theexhaust branch pipe 20 side. Here, in thewater jacket 34, the position where coolant is introduced at thecoolant inlet 36 a is a position, near thecoolant passage 34 b, of thecoolant passage 34 d that communicates thecoolant passage 34 b on the vertically lower side with thecoolant passage 34 a on the vertically upper side on one end side of theexhaust passages 32 in the direction in which theexhaust passages 32 are arranged (also simply referred to as the “arrangement direction”). Thecoolant inlet 36 a delivers coolant toward thecoolant passage 34 a on the vertically upper side from a position on thecoolant passage 34 b side that is on the vertically lower side. - That is, the direction in which coolant is delivered from the
coolant inlet 36 a is the direction from thecoolant passage 34 b side of thecoolant passage 34 d, that is one of the middle passages, toward thecoolant passage 34 a side. Thecoolant passage 34 b is on the vertically lower side and is a passage on the inside of the curve of the exhaust flow that follows the curve of the exhaust port 16 (thecoolant passage 34 b may also be referred to as an “inside passage” in this specification). Thecoolant passage 34 a, on the other hand, is on the vertically upper side and is a passage on the outside of the curve of the exhaust flow (thecoolant passage 34 a may also be referred to as an “outside passage” in this specification). - Also, the direction in which coolant is delivered from the
coolant inlet 36 a is the direction from thecoolant passage 34 b side of thecoolant passage 34 d, that is one of the middle passages, toward thecoolant passage 34 a side. Thecoolant passage 34 b is on the vertically lower side and is a passage on the inside of the curve of the exhaust flow that follows the bend at the connection of theexhaust port 16 and the exhaust passage 32 (thecoolant passage 34 b may also be referred to as an “inside passage” in this specification). Thecoolant passage 34 a, on the other hand, is on the vertically upper side and is a passage on the outside of the curve of the exhaust flow (thecoolant passage 34 a may also be referred to as an “outside passage” in this specification). - Therefore, coolant flows faster through the
coolant passage 34 a that is the outside passage than it does through thecoolant passage 34 b that is the inside passage. The following effects are able to be obtained with the first example embodiment described above. - As described above, the
exhaust port 16 is curved in a direction orthogonal to the arrangement direction thereof. Moreover, the connecting portion of theexhaust port 16 and theexhaust passage 32 of the exhaustgas cooling adapter 18 that is connected to theexhaust port 16 is bent in a direction orthogonal to the arrangement direction. The curve and the bend are both vertically downward. In accordance with this, the exhaust flow is in a direction that is orthogonal to the arrangement direction, and curves vertically downward. - As a result of this curve in the exhaust flow, the
coolant passage 34 a that is formed in the arrangement direction in the exhaustgas cooling adapter 18 and arranged on the vertically upper side functions as a first passage and an outside passage that corresponds to the innerperipheral surface 32 a on the high heat receiving side of theexhaust passage 32. Thecoolant passage 34 b that is formed in the arrangement direction and arranged on the vertically lower side functions as a second passage and an inside passage that corresponds to the innerperipheral surface 32 b on the low heat receiving side of theexhaust passage 32. Also, the twocoolant passages coolant passages - In this exhaust
gas cooling adapter 18, the flow direction of coolant delivered from thecoolant inlet 36 a into thewater jacket 34 is toward thecoolant passage 34 a side. Therefore, as shown by the arrows inFIGS. 5A and 5B , the main stream of the coolant flows through thecoolant passage 34 d that is the first middle passage of the two middle passages (i.e.,coolant passages coolant passage 34 b side toward thecoolant passage 34 a side. Accordingly, the amount (i.e., the flow rate) of coolant that flows toward thecoolant passage 34 b is small. Incidentally, in this example embodiment, thecoolant passage 34 d is located closer to thecoolant inlet 36 than thecoolant passage 34 e is. - As a result, the pressure of the coolant delivered from the
coolant inlet 36 a is sufficiently transmitted to thecoolant passage 34 a, while little coolant pressure is transmitted to thecoolant passage 34 b. Thus, coolant flows faster in thecoolant passage 34 a than it does in thecoolant passage 34 b. As a result, the flow rate of coolant that flows through thewater jacket 34 is greater in thecoolant passage 34 a and smaller in thecoolant passage 34 b, so the temperature at the innerperipheral surface 32 a on the vertically upper side of theexhaust passage 32 that tends to increase can be inhibited from increasing. Therefore, resistance to boiling at thecoolant passage 34 a as a result of heat transfer from the innerperipheral surface 32 a can also be improved. - The inner
peripheral surface 32 b on the vertically lower side essentially tends not to increase in temperature, so the temperature is able to be inhibited from increasing even if the coolant flow rate in thecorresponding coolant passage 34 b is reduced. In this way, theexhaust passage 32 of the exhaustgas cooling adapter 18 can be efficiently cooled without increasing the total flow rate of coolant that flows through thewater jacket 34, so the exhaustgas cooling adapter 18 will not become larger and the load on the water-jet pump will not increase. - Also, the
coolant outlet 38 a is a passage that discharges coolant in the same direction as the direction in which coolant flows (i.e., the flow direction of coolant) in thecoolant passage 34 a. Therefore, as shown by the arrows inFIGS. 5A and 5B , the flow direction of coolant that has flowed through thecoolant passage 34 a at a fast rate does not change when the coolant flows out to thecoolant outlet 38 a. As a result, the flow resistance does not increase when the coolant flows out of thecoolant passage 34 a, so the fast coolant flow of thecoolant passage 34 a is not impeded. - Therefore, the coolant flows more smoothly, which further increases the effects of suppressing the exhaust
gas cooling adapter 18 from becoming larger and suppressing the load on the water-jet pump from increasing. -
FIG. 6 is a sectional view of exhaustgas cooling adapters - With the exhaust
gas cooling adapter 118 shown inFIG. 6A , acoolant inlet 136 a of acoolant introducing portion 136 that introduces coolant into awater jacket 134 opens into acoolant passage 134 b (that functions as a second passage and an inside passage) that is arranged on the vertically lower side and extends in the direction in whichexhaust passages 132 are arranged (i.e., in the arrangement direction of the exhaust passages 132), and delivers coolant into thiscoolant passage 134 b. - A flow direction guide 136 b is formed on a side of an edge portion of a portion of the
coolant inlet 136 a that opens to thecoolant passage 134 b side, that is opposite acoolant passage 134 d (that functions as a middle passage) side. A tip end of this flow direction guide 136 b points toward thecoolant passage 134 d side. Therefore, the pressure of the coolant that has been introduced from thecoolant inlet 136 a into thecoolant passage 134 b is directed toward thecoolant passage 134 d side by the flow direction guide 136 b. - As a result, as shown by the arrows in the drawing, the main stream of the coolant flows toward the
coolant passage 134 d side, and the flow rate of this coolant is large. The flow rate of the coolant that flows through thecoolant passage 134 b toward the side with acoolant passage 134 e that is a middle passage on the opposite side is small. - The flow of the coolant (i.e., the coolant pressure) in the
coolant passage 134 d turns directly into the flow in acoolant passage 134 a (that functions as a first passage and an outside passage) that is arranged on the vertically upper side and extends in the direction in which theexhaust passages 132 are arranged (i.e., the arrangement direction of the exhaust passages 132), and then flows to acoolant discharging portion 138. - The direction of a
coolant outlet 138 a of thecoolant discharging portion 138 is the same as the direction of thecoolant passage 134 a, so the coolant also flows inside thecoolant outlet 138 a without losing any pressure, and is discharged outside as it is from thecoolant outlet 138 a. - With the exhaust
gas cooling adapter 218 shown inFIG. 6B , acoolant inlet 236 a of acoolant introducing portion 236 that introduces coolant into awater jacket 234 opens into acoolant passage 234 b (that functions as a second passage and an inside passage) that is arranged on the vertically lower side and extends in the direction in whichexhaust passages 232 are arranged (i.e., in the arrangement direction of the exhaust passages 232), and delivers the coolant into thiscoolant passage 234 b, similar toFIG. 6A . - However, in the example shown in
FIG. 6B , a flow direction guide 236 b is formed on a wall portion side of an opposingexhaust passage 232, instead of on an edge portion of thecoolant inlet 236 a. A tip end of this flow direction guide 236 b is formed pointed toward an edge portion of thecoolant inlet 236 a, that is on the side opposite acoolant passage 234 d (that functions as a middle passage) side. - Accordingly, the pressure of the coolant that has been introduced from the
coolant inlet 236 a into thecoolant passage 234 b is directed toward thecoolant passage 234 d side by the sloped surface of the flow direction guide 236 b. As a result, as shown by the arrows in the drawing, the main stream of the coolant flows toward thecoolant passage 234 d side, and the flow rate of this coolant is large. The flow rate of the coolant that flows through thecoolant passage 234 b toward the side with acoolant passage 234 e that is a middle passage on the opposite side is small. - The flow of the coolant (i.e., the coolant pressure) in this
coolant passage 234 d turns directly into the flow in acoolant passage 234 a (that functions as a first passage and an outside passage) that is arranged on the vertically upper side and extends in the direction in which theexhaust passages 232 are arranged (i.e., the arrangement direction of the exhaust passages 232), and then flows to acoolant discharging portion 238. - The direction of a
coolant outlet 238 a of thecoolant discharging portion 238 is the same as the direction of thecoolant passage 234 a, so the coolant flows without losing any pressure, and is discharged outside as it is from thecoolant outlet 238 a. - With the exhaust
gas cooling adapter 318 shown inFIG. 6C , acoolant inlet 336 a of acoolant introducing portion 336 that introduces coolant into awater jacket 334 opens into acoolant passage 334 b (that functions as a second passage and an inside passage) that is arranged on the vertically lower side and extends in the direction in whichexhaust passages 332 are arranged (i.e., in the arrangement direction of the exhaust passages 332), and delivers the coolant into thiscoolant passage 334 b. This is the same as inFIG. 6A . - However, compared with
FIG. 6A , thecoolant inlet 336 a of thecoolant introducing portion 336 is farther away from acoolant passage 334 d (that functions as a middle passage) and is provided in a position facing acoolant passage 334 c that connects acoolant passage 334 a (that functions as a first passage and an outside passage) with thecoolant passage 334 b at a center portion. Therefore, a flow direction guide 336 b that is formed on an opening edge portion of acoolant inlet 336 a on the side opposite thecoolant passage 334 d (that functions as a middle passage) is formed longer and extending toward thecoolant passage 334 d side, such that sufficient coolant pressure reliably reaches thecoolant passage 334 d. - As a result, as shown by the arrows in the drawing, the main stream of the coolant flows toward the
coolant passage 334 d side, and the flow rate of this coolant is large. The flow rate of the coolant that flows through thecoolant passage 334 b toward the side with acoolant passage 334 e that is a middle passage on the opposite side is small. - The flow of the coolant (i.e., the coolant pressure) in the
coolant passage 334 d turns directly into the flow in acoolant passage 334 a that is arranged on the vertically upper side and extends in the direction in which theexhaust passages 332 are arranged (i.e., in the arrangement direction of the exhaust passages 332), and then flows to acoolant discharging portion 338. - The direction of a
coolant outlet 338 a of thecoolant discharging portion 338 is the same as the direction of thecoolant passage 334 a, so the coolant flows without losing any pressure, and is discharged outside as it is from thecoolant outlet 338 a. - The following effects are able to be obtained with the second example embodiment described above. The main flow of coolant is able to be directed toward the
coolant passage coolant passage coolant introducing portion coolant passage - As a result, effects similar to those described in the first example embodiment are able to be obtained.
- With an exhaust
gas cooling adapter 418 shown inFIG. 7A , when acoolant inlet 436 a of acoolant introducing portion 436 is connected to acoolant passage 434 b that functions as a second passage and an inside passage, thecoolant inlet 436 a may be formed at an angle such that the main stream of coolant is directed toward acoolant passage 434 d that is a middle passage, instead of using a flow direction guide. - As a result, as shown by the arrows in the drawing, the flow of the coolant (i.e., the coolant pressure) in the
coolant passage 434 d turns directly into the flow in acoolant passage 434 a that functions as a first passage and an outside passage, and then flows to acoolant discharging portion 438. The coolant then flows without losing any pressure, and is discharged outside as it is from acoolant outlet 438 a. This structure also enables effects similar to those obtained in the first example embodiment to be obtained. - In the foregoing example embodiments, the direction of the coolant outlet of the coolant discharging portion follows the flow direction of coolant in the coolant passage that functions as the first passage and the outside passage. Alternatively, however, the direction of a
coolant outlet 538 a of acoolant discharging portion 538 may be a direction that is different from the flow direction of coolant in acoolant passage 534 a that functions as a first passage and an outside passage, as shown inFIG. 7B . In the example shown inFIG. 7B , the direction of thecoolant outlet 538 a is a direction that is orthogonal to the flow direction of coolant in thecoolant passage 534 a. With this structure as well, the pressure of coolant delivered from acoolant inlet 536 a of acoolant introducing portion 536 is transmitted to thecoolant passage 534 a via acoolant passage 534 d that serves as a middle passage, so a sufficiently large coolant flow rate is able to be ensured in thecoolant passage 534 a. As a result, effects similar to those obtained in the first example embodiment are able to be obtained. - Even if the exhaust port and the exhaust passage of the exhaust cooling adaptor are not bent, and there is only the curve of the exhaust port, the inner peripheral surface of the exhaust passage of the exhaust gas cooling adapter that is on the outside of the curve will become the high temperature receiving side, and the coolant passage that corresponds to this inner peripheral surface will become the first passage. Therefore, the effects described above can be obtained by having coolant flow in the manner described in the example embodiments described above.
- Incidentally, even if only the connecting portion of the exhaust port and the exhaust passage of the exhaust gas cooling adapter is bent, the inner peripheral surface of the exhaust passage of the exhaust gas cooling adapter that is on the outside of the bend will become the high temperature receiving side, and the coolant passage that corresponds to this inner peripheral surface will become the first passage. Therefore, the effects described above can be obtained by having coolant flow in the manner described in the example embodiments described above.
-
FIG. 1 is a view of an example in which the invention is applied to a V-type 6 cylinder internal combustion engine. However, the invention may also be applied to an engine having in-line configuration, as well as to an engine with a number of cylinders other than six, such as four cylinders or eight cylinders or the like.
Claims (21)
1. An internal combustion engine exhaust cooling system comprising:
an exhaust gas cooling adapter that is arranged between an exhaust port that opens in a cylinder head, and an exhaust branch pipe, and cools exhaust gas that flows through an exhaust passage by running coolant through a coolant passage formed inside of a wall that surrounds the exhaust passage,
wherein the exhaust gas cooling adapter includes a coolant inlet that introduces coolant into the coolant passage, and a coolant outlet that discharges coolant outside from the coolant passage;
the coolant passage includes a first passage that is on a high heat receiving side and a second passage that is on a low heat receiving side, the first passage and the second passage being provided according to an offset of an amount of heat received from exhaust gas in a circumferential direction of an inner surface of the exhaust passage, and two middle passages that connect the first passage with the second passage at both ends of the two middle passages;
a coolant delivery direction of the coolant inlet is a direction from the second passage side of a first middle passage, of the two middle passages, toward the first passage side; and
the coolant outlet discharges coolant from a location where a second middle passage, of the two middle passages, is connected with the first passage, or from near the location.
2. The internal combustion engine exhaust cooling system according to claim 1 , wherein the first middle passage is located closer to the coolant inlet than the second middle passage is.
3. The internal combustion engine exhaust cooling system according to claim 1 , wherein the coolant outlet discharges coolant in the same direction as a flow direction of coolant in the first passage.
4. The internal combustion engine exhaust cooling system according to claim 1 , wherein a plurality of the exhaust ports are provided;
each of the plurality of exhaust ports is arranged and open in a cylinder head;
a plurality of the exhaust passages are formed in an arrangement inside the exhaust gas cooling adapter,
the arrangement of the plurality of exhaust passages corresponding to an arrangement of the plurality of exhaust ports; and
the exhaust ports are formed curved in a direction orthogonal to an arrangement direction of the exhaust passages, or the exhaust ports and the exhaust passages are connected bent in a direction orthogonal to the arrangement direction.
5. The internal combustion engine exhaust cooling system according to claim 4 , wherein the arrangement direction of the exhaust ports in the cylinder head is a horizontal direction, and the direction orthogonal to the arrangement direction is vertically downward.
6. The internal combustion engine exhaust cooling system according to claim 1 , wherein a plurality of the exhaust ports are provided;
each of the plurality of exhaust ports is arranged and open in a cylinder head; a plurality of the exhaust passages are formed in an arrangement inside the exhaust gas cooling adapter,
the arrangement of the plurality of exhaust passages corresponding to an arrangement of the plurality of exhaust ports;
the exhaust ports are formed curved in a direction orthogonal to an arrangement direction of the exhaust passages, or the exhaust ports and the exhaust passages are connected bent in a direction orthogonal to the arrangement direction;
the coolant inlet delivers coolant from the second passage toward the first passage via a middle passage on one end side in the arrangement direction; and
the coolant outlet discharges coolant from a location where a middle passage on the other end side in the arrangement direction is connected to the first passage, or from near the location.
7. The internal combustion engine exhaust cooling system according to claim 1 , wherein a flow direction guide that guides a flow of coolant delivered from the coolant inlet to a first middle passage, of the two middle passages, is provided in the coolant passage, in a location near the coolant inlet.
8. An internal combustion engine exhaust cooling system comprising:
an exhaust gas cooling adapter that is arranged between an exhaust port that opens in a cylinder head, and an exhaust branch pipe, and cools exhaust gas that flows through an exhaust passage by running coolant through a coolant passage formed inside of a wall that surrounds the exhaust passage,
wherein the exhaust gas cooling adapter includes a coolant inlet that introduces coolant into the coolant passage, and a coolant outlet that discharges coolant outside from the coolant passage;
the coolant passage includes an outside passage of a curve and an inside passage of a curve that are provided according to a curve in an exhaust flow produced by a curved shape of the exhaust port, and two middle passages that connect the outside passage with the inside passage at both ends of the two middle passages;
a coolant delivery direction of the coolant inlet is a direction from the inside passage side of a first middle passage, of the two middle passages, toward the outside passage side; and
the coolant outlet discharges coolant from a location where a second middle passage, of the two middle passages, is connected with the outside passage, or from near the location.
9. The internal combustion engine exhaust cooling system according to claim 8 , wherein the first middle passage is located closer to the coolant inlet than the second middle passage.
10. The internal combustion engine exhaust cooling system according to claim 8 , wherein the exhaust passage is bent with respect to the exhaust port.
11. The internal combustion engine exhaust cooling system according to claim 8 , wherein the coolant outlet discharges coolant in the same direction as a flow direction of coolant in the outside passage.
12. The internal combustion engine exhaust cooling system according to claim 8 , wherein a plurality of the exhaust ports are provided;
each of the plurality of exhaust ports is arranged and open in a cylinder head;
a plurality of the exhaust passages are formed in an arrangement inside the exhaust gas cooling adapter,
the arrangement of the plurality of exhaust passages corresponding to an arrangement of the plurality of exhaust ports; and
the exhaust ports are formed curved in a direction orthogonal to an arrangement direction of the exhaust passages, or the exhaust ports and the exhaust passages are connected bent in a direction orthogonal to the arrangement direction.
13. The internal combustion engine exhaust cooling system according to claim 12 , wherein the arrangement direction of the exhaust ports in the cylinder head is a horizontal direction, and the direction orthogonal to the arrangement direction is vertically downward.
14. The internal combustion engine exhaust cooling system according to claim 8 , wherein a plurality of the exhaust ports are provided;
each of the plurality of exhaust ports is arranged and open in a cylinder head;
a plurality of the exhaust passages are formed in an arrangement inside the exhaust gas cooling adapter,
the arrangement of the plurality of exhaust passages corresponding to an arrangement of the plurality of exhaust ports;
the exhaust ports are formed curved in a direction orthogonal to an arrangement direction of the exhaust passages, or the exhaust ports and the exhaust passages are connected bent in a direction orthogonal to the arrangement direction;
the coolant inlet delivers coolant from the inside passage toward the outside passage via a middle passage on one end side in the arrangement direction; and
the coolant outlet discharges coolant from a location where a middle passage on the other end side in the arrangement direction is connected to the outside passage, or from near the location.
15. The internal combustion engine exhaust cooling system according to claim 8 , wherein a flow direction guide that guides a flow of coolant delivered from the coolant inlet to a first middle passage, of the two middle passages, is provided in the coolant passage, in a location near the coolant inlet.
16. An internal combustion engine exhaust cooling system comprising:
an exhaust gas cooling adapter that is arranged between an exhaust port that opens in a cylinder head, and an exhaust branch pipe, and cools exhaust gas that flows through an exhaust passage by running coolant through a coolant passage formed inside of a wall that surrounds the exhaust passage,
wherein the exhaust gas cooling adapter includes a coolant inlet that introduces coolant into the coolant passage, and a coolant outlet that discharges coolant outside from the coolant passage;
the coolant passage includes an outside passage of a curve and an inside passage of a curve that are provided according to a curve in an exhaust flow produced by a bent shape of a connecting portion between the exhaust port and the exhaust passage, and two middle passages that connect the outside passage with the inside passage at both ends of the two middle passages;
a coolant delivery direction of the coolant inlet is a direction from the inside passage side of a first middle passage, of the two middle passages, toward the outside passage side; and
the coolant outlet discharges coolant from a location where a second middle passage, of the two middle passages, is connected with the outside passage, or from near the location.
17. The internal combustion engine exhaust cooling system according to claim 16 , wherein the first middle passage is located closer to the coolant inlet than the second middle passage.
18. The internal combustion engine exhaust cooling system according to claim 16 , wherein a plurality of the exhaust ports are provided;
each of the plurality of exhaust ports is arranged and open in a cylinder head;
a plurality of the exhaust passages are formed in an arrangement inside the exhaust gas cooling adapter,
the arrangement of the plurality of exhaust passages corresponding to an arrangement of the plurality of exhaust ports; and
the exhaust ports are formed curved in a direction orthogonal to an arrangement direction of the exhaust passages, or the exhaust ports and the exhaust passages are connected bent in a direction orthogonal to the arrangement direction.
19. The internal combustion engine exhaust cooling system according to claim 18 , wherein the arrangement direction of the exhaust ports in the cylinder head is a horizontal direction, and the direction orthogonal to the arrangement direction is vertically downward.
20. The internal combustion engine exhaust cooling system according to claim 16 , wherein a plurality of the exhaust ports are provided;
each of the plurality of exhaust ports is arranged and open in a cylinder head;
a plurality of the exhaust passages are formed in an arrangement inside the exhaust gas cooling adapter, the arrangement of the plurality of exhaust passages corresponding to an arrangement of the plurality of exhaust ports;
the exhaust ports are formed curved in a direction orthogonal to an arrangement direction of the exhaust passages, or the exhaust ports and the exhaust passages are connected bent in a direction orthogonal to the arrangement direction;
the coolant inlet delivers coolant from the inside passage toward the outside passage via a middle passage on one end side in the arrangement direction; and
the coolant outlet discharges coolant from a location where a middle passage on the other end side in the arrangement direction is connected to the outside passage, or from near the location.
21. The internal combustion engine exhaust cooling system according to claim 16 , wherein a flow direction guide that guides a flow of coolant delivered from the coolant inlet to a first middle passage, of the two middle passages, is provided in the coolant passage, in a location near the coolant inlet.
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JPJP2010-066974 | 2010-03-23 | ||
JP2010066974A JP4905573B2 (en) | 2010-03-23 | 2010-03-23 | Internal combustion engine exhaust cooling system |
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US20110232275A1 true US20110232275A1 (en) | 2011-09-29 |
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GB2530558A (en) * | 2014-09-26 | 2016-03-30 | Treemagineers Ltd | Carabiner |
US20160186704A1 (en) * | 2014-12-26 | 2016-06-30 | Mazda Motor Corporation | Exhaust gas recirculation system for engine |
US20160290202A1 (en) * | 2013-11-22 | 2016-10-06 | Toyota Jidosha Kabushiki Kaisha | Exhaust treatment device |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150167583A1 (en) * | 2012-10-01 | 2015-06-18 | Toyota Jidosha Kabushiki Kaisha | Exhaust passage structure for internal combustion engine |
US20160290202A1 (en) * | 2013-11-22 | 2016-10-06 | Toyota Jidosha Kabushiki Kaisha | Exhaust treatment device |
US9657623B2 (en) * | 2013-11-22 | 2017-05-23 | Toyota Jidosha Kabushiki Kaisha | Exhaust treatment device |
GB2530558A (en) * | 2014-09-26 | 2016-03-30 | Treemagineers Ltd | Carabiner |
US20160186704A1 (en) * | 2014-12-26 | 2016-06-30 | Mazda Motor Corporation | Exhaust gas recirculation system for engine |
Also Published As
Publication number | Publication date |
---|---|
CN102200046B (en) | 2014-08-20 |
JP2011196351A (en) | 2011-10-06 |
JP4905573B2 (en) | 2012-03-28 |
CN102200046A (en) | 2011-09-28 |
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Legal Events
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Owner name: TOYOTA JIDOSHA KABUSHIKI KAISHA, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:WATANABE, TETSUJI;MITANI, SHINICHI;INOUE, FUJIO;REEL/FRAME:026022/0320 Effective date: 20101210 |
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