US20080038117A1 - Pumping System Employing a Variable-Displacement Vane Pump - Google Patents
Pumping System Employing a Variable-Displacement Vane Pump Download PDFInfo
- Publication number
- US20080038117A1 US20080038117A1 US10/571,704 US57170404A US2008038117A1 US 20080038117 A1 US20080038117 A1 US 20080038117A1 US 57170404 A US57170404 A US 57170404A US 2008038117 A1 US2008038117 A1 US 2008038117A1
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- Prior art keywords
- pump
- pressure
- chamber
- oil
- delivery
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
- F04C14/18—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber
- F04C14/22—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members
- F04C14/223—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members using a movable cam
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
- F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
- F04C2/344—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
- F04C2/3441—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation
- F04C2/3442—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation the surfaces of the inner and outer member, forming the working space, being surfaces of revolution
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2270/00—Control; Monitoring or safety arrangements
- F04C2270/18—Pressure
Definitions
- the present invention relates to a variable-displacement vane pump comprising a main body having a cavity, in which is movable a ring containing a rotor rotating about a fixed axis.
- the rotor has a number of vanes, one end of each of which rests on the inner surface of the ring during rotation.
- Means are also provided which, depending on a control pressure, move the ring between a centred position with respect to the rotation axis of the rotor, in which no pumping action takes place, and a predetermined eccentric position with respect to the rotation axis of the rotor.
- Vane pumps of the above type are currently used to pump various fluids, such as oil in an internal combustion engine.
- a pumping system employing a variable-displacement vane pump, as claimed in claim 1 .
- FIG. 1 shows a first embodiment of the present invention
- FIG. 2 shows a first configuration of a second embodiment
- FIG. 3 shows a second configuration of the second embodiment in FIG. 2 ;
- FIG. 4 shows a first configuration of a detail of the second embodiment in FIGS. 2 and 3 ;
- FIG. 5 shows a second configuration of the FIG. 4 detail
- FIG. 6 shows a third embodiment of the present invention.
- Number 10 in FIG. 1 indicates a variable-delivery vane pump forming part of a pumping system 100 in accordance with the present invention.
- Pump 10 comprises, in known manner, a main body 11 having a cavity 12 in which a ring 13 translates as described in detail later on.
- Ring 13 houses a rotor 14 having a number of vanes 15 , which move radially inside respective radial slits 16 formed in rotor 14 , which is rotated in the direction indicated by arrow W (see below).
- Main body 11 is closed by a cover not shown in the drawings.
- rotor 14 houses a shaft 17 connected mechanically to rotor 14 ; and a floating ring 18 surrounding shaft 17 , and on which the other ends of vanes 15 rest.
- Shaft 17 therefore has a centre P 1 which is fixed at all times; and ring 13 has a centre P 2 .
- the distance P 1 P 2 represents the eccentricity E of pump 10 .
- eccentricity E the delivery of pump 10 can be varied as required by a user device UT downstream from pump 10 (see below).
- User device UT may be defined, for example, by an internal combustion engine (not shown).
- ring 13 has a projection 19 housed partly in a chamber 20 ; and a projection 21 housed partly in a chamber 22 .
- Projections 19 and 21 are located on opposite sides of centre P 2 of ring 13 , and have respective front surfaces A 1 and A 2 facing chambers 20 and 22 respectively.
- surface A 2 is larger than surface A 1 . More specifically, tests and calculations have shown surface A 2 must be 1.4 to 1.7 times larger than surface A 1 .
- a spring 22 a inside chamber 22 exerts a small force on surface A 2 to restore the system to a condition of maximum eccentricity E when system 100 is idle.
- chambers 20 and 22 are formed in main body 11 of pump 10 .
- Main body 11 also comprises an intake port 23 for drawing oil from a tank 24 ; and a delivery port 25 for feeding oil to user device UT.
- a delivery conduit 26 extends from delivery port 25 to feed user device UT.
- a first portion of the oil supplied to user device UT is diverted to chamber 20 by a conduit 27 , and a second portion of the oil is fed to chamber 22 by a conduit 28 .
- the second portion of the oil in conduit 28 is almost all fed to chamber 22 by a conduit 28 a via a dissipating device 29 , in which a calibrated pressure loss occurs as the oil actually flows through it.
- Conduit 28 is connected to a valve 30 by a conduit 28 b.
- Valve 30 comprises a cylinder 31 housing a piston 32 .
- piston 32 comprises a first portion 32 a and a second portion 32 b connected to each other by a rod 32 c.
- Portions 32 a and 32 b are equal in cross section to cylinder 31 , whereas rod 32 c is smaller in cross section than cylinder 31 .
- Cylinder 31 has a port 33 connected hydraulically to chamber 22 by a conduit 34 .
- Conduit 28 b substantially provides for picking up a delivery pressure signal in conduit 28 , so as to act on the front surface A 3 of portion 32 a of piston 32 .
- the dash line in FIG. 1 shows the situation in which port 33 is closed by second portion 32 b.
- the oil is at atmospheric pressure (po).
- Piston 32 is stressed elastically by a suitably sized spring 36 designed to generate a force which only permits movement of piston 32 when the delivery pressure (p 1 ) on surface A 3 reaches a given value.
- a return conduit 37 from user device UT to tank 24 completes pumping system 100 .
- eccentricity E is normally regulated by diverting a portion of the oil supply into a chamber, in which the delivery pressure acts directly on the ring; and an elastic counteracting force, generated by a spring, acts on the opposite side of the ring, so that the pump is set to an eccentricity E value ensuring the oil pressure and flow requested by the user device.
- Incomplete fill has the side effect of generating a force acting in the direction indicated by arrow F 1 in FIG. 1 .
- the user device fails to obtain the required delivery pressure, on account of this undesired force which, as stated, is substantially caused by incomplete oil fill of the gaps between the vanes.
- piston 32 moves into the configuration shown by the continuous line in FIG. 1 , in which rod 32 c of piston 32 is located at port 33 , and so permits oil flow from chamber 22 to conduit 34 , and along conduit 35 into tank 24 .
- Oil therefore also flows along conduit 28 a and through dissipating device 29 , so that, as opposed to the delivery pressure (p 1 ), a lower pressure (p 2 ) is present in chamber 22 .
- the pressure (p 2 ) in chamber 22 is lower than the pressure (p 1 ) in chamber 20 , thus disassociating the two pressures to enable ring 13 to move in the direction indicated by arrow F 1 to establish a balanced eccentricity E value producing the desired oil flow to user deice UT.
- valve 30 also acts as a pressure dissipating device to assist in creating the desired pressure (p 2 ) in chamber 22 .
- the system has also proved stable.
- valve 30 which is regulated solely by delivery pressure (p 1 ) and totally unaffected by undesired internal forces.
- valve 30 opens, and oil flows along conduit 34 , through port 33 , and along conduit 35 to tank 24 , so that the pressure (p 2 ) in chamber 22 is lower than (p 1 ), and ring 13 moves in the direction of arrow F 1 to reduce displacement and therefore oil flow to user device UT.
- dissipating device 29 and valve 30 are replaced by a three-way slide valve 50 .
- Valve 50 comprises a cylinder 51 housing a slide 52 stressed by a spring 53 .
- slide 52 comprises a first portion 52 a, a second portion 52 b, and a third portion 52 c. Portions 52 a and 52 b are connected by a rod 52 d, and portions 52 b and 52 c are connected by a rod 52 e.
- Cylinder 51 comprises four ports 54 , 55 , 56 , 57 . More specifically, port 54 defines the first way of three-way valve 50 , ports 56 and 57 together define the second way, and port 55 defines the third way.
- Slide 52 is controlled by delivery pressure (p 1 ).
- the value of ⁇ 1, which represents the size of port 56 must be greater than ⁇ 2, i.e. the size of the closed area covered by portion 52 b of slide 52 .
- slide 52 begins moving in the direction of arrow F 3 , so that oil flows from port 54 to port 56 , and from port 57 to port 55 and into tank 24 maintained at atmospheric pressure (p 0 ) ( FIGS. 3 , 5 ).
- FIG. 6 shows a third embodiment of the present invention.
- pressure is regulated in chamber 20 as opposed to chamber 22 .
- Chamber 22 in fact houses a spring 60 for opposing the force produced in chamber 20 , and is at atmospheric pressure (p 0 ).
- valve 70 As shown in FIG. 6 , oil is diverted from delivery conduit 26 to a valve 70 which, as before, opens as soon as delivery pressure (p 1 ) exceeds the calibration value (p*) of valve 70 defined by the resistance of a calibration spring 72 a.
- Valve 70 comprises a cylinder 71 housing a piston 72 stressed elastically by spring 72 a.
- delivery pressure (p 1 ) exceeds value (p*) (defined by spring 72 a )
- piston 72 moves to uncover a port 73 in cylinder 71 .
- Oil therefore flows into a conduit 74 fitted with a dissipating device 75 connected to tank 24 by a conduit 76 .
- the pressure (p 2 ) of the oil in chamber 20 is therefore lower than delivery pressure (p 1 ), so that a force is produced which is opposed by the reaction force produced by spring 60 in chamber 22 .
Abstract
A pumping system has a variable-delivery vane pump. The pump has hydraulic pressure regulating dissipating devices for imparting to the oil, in a regulating chamber, a pressure lower than the delivery pressure.
Description
- The present invention relates to a variable-displacement vane pump comprising a main body having a cavity, in which is movable a ring containing a rotor rotating about a fixed axis. The rotor has a number of vanes, one end of each of which rests on the inner surface of the ring during rotation.
- Means are also provided which, depending on a control pressure, move the ring between a centred position with respect to the rotation axis of the rotor, in which no pumping action takes place, and a predetermined eccentric position with respect to the rotation axis of the rotor.
- Vane pumps of the above type are currently used to pump various fluids, such as oil in an internal combustion engine.
- As is known, in pumps of the above type, at high rotation speeds of the shaft connected to the rotor, the gaps between adjacent vanes on the pump fail to fill completely, thus resulting in forces impairing operation of the pump.
- To counteract the increase in such forces, counteracting springs are traditionally used, but are extremely rigid and therefore do not deform easily.
- It is therefore an object of the present invention to provide for hydraulic control of a variable-delivery vane pump, particularly at high speed.
- According to the present invention, there is provided a pumping system employing a variable-displacement vane pump, as claimed in claim 1.
- A number of non-limiting embodiments of the present invention will be described by way of example with reference to the accompanying drawings, in which:
-
FIG. 1 shows a first embodiment of the present invention; -
FIG. 2 shows a first configuration of a second embodiment; -
FIG. 3 shows a second configuration of the second embodiment inFIG. 2 ; -
FIG. 4 shows a first configuration of a detail of the second embodiment inFIGS. 2 and 3 ; -
FIG. 5 shows a second configuration of theFIG. 4 detail; -
FIG. 6 shows a third embodiment of the present invention. -
Number 10 inFIG. 1 indicates a variable-delivery vane pump forming part of apumping system 100 in accordance with the present invention. -
Pump 10 comprises, in known manner, amain body 11 having acavity 12 in which aring 13 translates as described in detail later on. -
Ring 13 houses arotor 14 having a number ofvanes 15, which move radially inside respectiveradial slits 16 formed inrotor 14, which is rotated in the direction indicated by arrow W (see below). -
Main body 11 is closed by a cover not shown in the drawings. - In known manner,
rotor 14 houses ashaft 17 connected mechanically torotor 14; and afloating ring 18 surroundingshaft 17, and on which the other ends ofvanes 15 rest. -
Shaft 17 therefore has a centre P1 which is fixed at all times; andring 13 has a centre P2. - The distance P1P2 represents the eccentricity E of
pump 10. - As is known, by varying eccentricity E, the delivery of
pump 10 can be varied as required by a user device UT downstream from pump 10 (see below). - User device UT may be defined, for example, by an internal combustion engine (not shown).
- As shown in
FIG. 1 ,ring 13 has aprojection 19 housed partly in achamber 20; and aprojection 21 housed partly in achamber 22.Projections ring 13, and have respective front surfaces A1 andA2 facing chambers - A
spring 22 ainside chamber 22 exerts a small force on surface A2 to restore the system to a condition of maximum eccentricity E whensystem 100 is idle. - In the
FIG. 1 embodiment,chambers main body 11 ofpump 10. -
Main body 11 also comprises anintake port 23 for drawing oil from atank 24; and adelivery port 25 for feeding oil to user device UT. - A
delivery conduit 26 extends fromdelivery port 25 to feed user device UT. - As shown in
FIG. 1 , a first portion of the oil supplied to user device UT is diverted tochamber 20 by aconduit 27, and a second portion of the oil is fed tochamber 22 by aconduit 28. - More specifically, the second portion of the oil in
conduit 28 is almost all fed tochamber 22 by aconduit 28 a via adissipating device 29, in which a calibrated pressure loss occurs as the oil actually flows through it. -
Conduit 28 is connected to avalve 30 by aconduit 28 b. -
Valve 30 comprises acylinder 31 housing apiston 32. - More specifically, as shown in
FIG. 1 ,piston 32 comprises afirst portion 32 a and asecond portion 32 b connected to each other by arod 32 c. -
Portions cylinder 31, whereasrod 32 c is smaller in cross section thancylinder 31. -
Cylinder 31 has a port 33 connected hydraulically tochamber 22 by aconduit 34. -
Conduit 28 b substantially provides for picking up a delivery pressure signal inconduit 28, so as to act on the front surface A3 ofportion 32 a ofpiston 32. - The dash line in
FIG. 1 shows the situation in which port 33 is closed bysecond portion 32 b. - As described in more detail later on, as the delivery pressure (p1) increases alongside an increase in the operating speed of
pump 10, greater force is exerted on surface A3 and, on reaching the preload value of a spring 36, movespiston 32 to allow oil flow fromconduit 34 through port 33 and along aconduit 35 intotank 24. - At the start of
conduit 35, the oil is at atmospheric pressure (po). - Piston 32 is stressed elastically by a suitably sized spring 36 designed to generate a force which only permits movement of
piston 32 when the delivery pressure (p1) on surface A3 reaches a given value. - A
return conduit 37 from user device UT to tank 24 completespumping system 100. - In the known art, eccentricity E is normally regulated by diverting a portion of the oil supply into a chamber, in which the delivery pressure acts directly on the ring; and an elastic counteracting force, generated by a spring, acts on the opposite side of the ring, so that the pump is set to an eccentricity E value ensuring the oil pressure and flow requested by the user device.
- As stated, however, at high rotation speed of the shaft, and therefore of the rotor and vanes, the gaps between adjacent vanes fail to fill completely, thus resulting in undesired forces which, in addition to high rotation speed of the rotor, also depend on the temperature and chemical-physical characteristics of the oil.
- Incomplete fill has the side effect of generating a force acting in the direction indicated by arrow F1 in
FIG. 1 . - Consequently, the user device fails to obtain the required delivery pressure, on account of this undesired force which, as stated, is substantially caused by incomplete oil fill of the gaps between the vanes.
- By way of a solution to the problem, an attempt has been made to disassociate control from the above negative internal forces by providing for so-called “hydraulic control”.
- With reference to
FIG. 1 , since, as stated, surface A2 is larger (preferably 1.4 to 1.7 times larger) than surface A1, it follows that, if the delivery pressure (p1) were present in bothchambers gaps 15 a, thus resulting in maximum eccentricity E. - In this case, however, there would be no adjustment. To achieve the desired adjustment, therefore, the oil pressure in
chamber 22 must be made lower than inchamber 20. - Consequently, when the delivery pressure (p1) reaches a value capable of generating sufficient force on surface A3 of
portion 32 a to overcome the elastic force of spring 36,piston 32 moves into the configuration shown by the continuous line inFIG. 1 , in whichrod 32 c ofpiston 32 is located at port 33, and so permits oil flow fromchamber 22 to conduit 34, and alongconduit 35 intotank 24. - Oil therefore also flows along
conduit 28 a and throughdissipating device 29, so that, as opposed to the delivery pressure (p1), a lower pressure (p2) is present inchamber 22. - In other words, the pressure (p2) in
chamber 22 is lower than the pressure (p1) inchamber 20, thus disassociating the two pressures to enablering 13 to move in the direction indicated by arrow F1 to establish a balanced eccentricity E value producing the desired oil flow to user deice UT. - More specifically, as delivery pressure increases to a value (p*) determined by the characteristics of spring 36,
piston 32 begins moving so that part of the oil leaks through port 33. In other words,valve 30 also acts as a pressure dissipating device to assist in creating the desired pressure (p2) inchamber 22. - (p1) and (p*) are equal at the end of the transient state
- The system has also proved stable.
- That is, adjustment continues for as long as permitted by
piston 32, i.e. control is taken over byvalve 30, which is regulated solely by delivery pressure (p1) and totally unaffected by undesired internal forces. - Conversely, in known regulating systems, when delivery pressure (p1) increases, it remains constant for a while, and then decreases.
- With the system employed in
system 100, on the other hand, on reaching the value required by user device UT, pressure (p1) remains constant, even at extremely high rotation speeds ofrotor 14. - When delivery pressure reaches pressure value (p*), substantially determined by the characteristics of spring 36, generation of pressure (p2) commences, and
ring 13 begins moving in the direction of arrow F1 to reduce eccentricity E and therefore the displacement ofpump 10. Consequently, delivery pressure falls, and tends to assume a value below (p*), so thatpiston 32 moves into an intermediate balance position reducing the size of port 33. - Displacement remains fixed up to a given pressure value and, as pump speed increases, tends to increase delivery. When a given pressure value (p*) is reached,
valve 30 opens, and oil flows alongconduit 34, through port 33, and alongconduit 35 totank 24, so that the pressure (p2) inchamber 22 is lower than (p1), andring 13 moves in the direction of arrow F1 to reduce displacement and therefore oil flow to user device UT. - In a second embodiment shown in
FIGS. 2 to 5 , dissipatingdevice 29 andvalve 30 are replaced by a three-way slide valve 50. -
Valve 50 comprises acylinder 51 housing aslide 52 stressed by aspring 53. - As shown more clearly in
FIGS. 4 and 5 , slide 52 comprises afirst portion 52 a, asecond portion 52 b, and athird portion 52 c.Portions rod 52 d, andportions rod 52 e. -
Cylinder 51 comprises fourports port 54 defines the first way of three-way valve 50,ports port 55 defines the third way. -
Slide 52 is controlled by delivery pressure (p1). - As shown in
FIG. 4 , the value of ε1, which represents the size ofport 56, must be greater than ε2, i.e. the size of the closed area covered byportion 52 b ofslide 52. - As shown in
FIGS. 2 and 4 , when delivery pressure (p1) is below a given value (p*), the oil pressure inchamber 22 assumes the delivery pressure (p1) value, pump 10 is set to maximum eccentricity, and no pumping action occurs. - As delivery pressure (p1) increases, slide 52 begins moving in the direction of arrow F3, so that oil flows from
port 54 toport 56, and fromport 57 toport 55 and intotank 24 maintained at atmospheric pressure (p0) (FIGS. 3 , 5). - In other words, oil leaks from
valve 50, thus resulting in a load loss, so that the pressure (p2) of the oil inchamber 22 assumes an intermediate value between delivery pressure (p1) and the atmospheric pressure (p0) oftank 24. -
FIG. 6 shows a third embodiment of the present invention. - Unlike the two embodiments described above, in this case, pressure is regulated in
chamber 20 as opposed tochamber 22. -
Chamber 22 in fact houses aspring 60 for opposing the force produced inchamber 20, and is at atmospheric pressure (p0). - As shown in
FIG. 6 , oil is diverted fromdelivery conduit 26 to avalve 70 which, as before, opens as soon as delivery pressure (p1) exceeds the calibration value (p*) ofvalve 70 defined by the resistance of a calibration spring 72 a. -
Valve 70 comprises acylinder 71 housing apiston 72 stressed elastically by spring 72 a. When delivery pressure (p1) exceeds value (p*) (defined by spring 72 a),piston 72 moves to uncover aport 73 incylinder 71. - Oil therefore flows into a
conduit 74 fitted with a dissipatingdevice 75 connected totank 24 by aconduit 76. - The pressure (p2) of the oil in
chamber 20 is therefore lower than delivery pressure (p1), so that a force is produced which is opposed by the reaction force produced byspring 60 inchamber 22. - The mechanism by which equilibrium is established in
vane pump 10 is the same as described for the other two embodiments.
Claims (6)
1. A pumping system (100) comprising a variable-delivery vane pump (10); the system (100) also comprising a user device (UT) connected to said pump (10) by a delivery conduit (26), and pressure regulating means for adjusting the eccentricity (E) of a ring (13) with respect to a rotor (14), both forming part of said pump (10), so that said pump (10) assumes a balanced configuration such as to supply the oil flow requested by said user device (UT);
the system (100) being characterized in that said pressure regulating means comprise hydraulic dissipating means (29, 30; 50; 70, 75) for imparting to the oil inside a regulating chamber (20, 22) forming part of said pump (10) a pressure (p2) lower than a control pressure (p1).
2. A system (100) as claimed in claim 1 , characterized in that said hydraulic dissipating means comprise a valve (30; 70) and a dissipating device (29; 75).
3. A system (100) as claimed in claim 1 , characterized in that said hydraulic dissipating means comprise a three-way slide valve (50).
4. A system (100) as claimed in claim 1 , characterized in that said pump (10) comprises a hollow main body (11) having at least one chamber (20, 22); and in that said chamber (20, 22) houses a respective projection (19, 21) integral with said ring (13).
5. A system (100) as claimed in claim 4 , characterized in that said projection (21) has a first front surface (A2) greater than a second front surface (A1) of said projection (19).
6. A system (100) as claimed in claim 4 , characterized in that the size of said first front surface (A2) is 1.4 to 1.7 times said second front surface (A1).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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ITBO2003A000528 | 2003-09-12 | ||
IT000528A ITBO20030528A1 (en) | 2003-09-12 | 2003-09-12 | PUMPING SYSTEM USING A PALETTE PUMP |
PCT/EP2004/052140 WO2005026553A1 (en) | 2003-09-12 | 2004-09-10 | Pumping system employing a variable-displacement vane pump |
Publications (1)
Publication Number | Publication Date |
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US20080038117A1 true US20080038117A1 (en) | 2008-02-14 |
Family
ID=34308075
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US10/571,704 Abandoned US20080038117A1 (en) | 2003-09-12 | 2004-09-10 | Pumping System Employing a Variable-Displacement Vane Pump |
Country Status (4)
Country | Link |
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US (1) | US20080038117A1 (en) |
EP (1) | EP1680602B1 (en) |
IT (1) | ITBO20030528A1 (en) |
WO (1) | WO2005026553A1 (en) |
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WO2018051673A1 (en) * | 2016-09-16 | 2018-03-22 | 日立オートモティブシステムズ株式会社 | Variable capacity pump and hydraulic fluid supply system for internal combustion engine |
US20190338771A1 (en) * | 2018-05-02 | 2019-11-07 | GM Global Technology Operations LLC | Variable displacement pump |
US11268509B2 (en) * | 2017-08-03 | 2022-03-08 | Pierburg Pump Technology Gmbh | Variable displacement lubricant vane pump |
US11415128B2 (en) * | 2017-06-22 | 2022-08-16 | Hitachi Astemo, Ltd. | Variable displacement pump and control method therefor |
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US8696326B2 (en) | 2009-05-14 | 2014-04-15 | Magna Powertrain Inc. | Integrated electrical auxiliary oil pump |
US9097251B2 (en) | 2009-06-16 | 2015-08-04 | Pierburg Pump Technology Gmbh | Variable-displacement lubricant pump |
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US20120143470A1 (en) * | 2010-12-06 | 2012-06-07 | GM Global Technology Operations LLC | Method for operating a variable displacement oil pump |
US9394891B2 (en) | 2011-02-21 | 2016-07-19 | Pierburg Pump Technology Gmbh | Variable displacement lubricant pump with a pressure control valve having a preload control arrangement |
WO2013093711A1 (en) | 2011-12-22 | 2013-06-27 | Vhit S.P.A. | Rotary positive displacement pump and method of regulating its displacement |
ITTO20111188A1 (en) * | 2011-12-22 | 2013-06-23 | Vhit Spa | VARIABLE DISPLACEMENT PUMP AND ADJUSTMENT METHOD OF ITS DISPLACEMENT |
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CN105960531A (en) * | 2013-11-21 | 2016-09-21 | 皮尔伯格泵技术有限责任公司 | Variable displacement lubricant pump |
WO2018051673A1 (en) * | 2016-09-16 | 2018-03-22 | 日立オートモティブシステムズ株式会社 | Variable capacity pump and hydraulic fluid supply system for internal combustion engine |
JP2018044523A (en) * | 2016-09-16 | 2018-03-22 | 日立オートモティブシステムズ株式会社 | Variable displacement pump and working fluid supply system of internal combustion engine |
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US11415128B2 (en) * | 2017-06-22 | 2022-08-16 | Hitachi Astemo, Ltd. | Variable displacement pump and control method therefor |
US11268509B2 (en) * | 2017-08-03 | 2022-03-08 | Pierburg Pump Technology Gmbh | Variable displacement lubricant vane pump |
US20190338771A1 (en) * | 2018-05-02 | 2019-11-07 | GM Global Technology Operations LLC | Variable displacement pump |
Also Published As
Publication number | Publication date |
---|---|
WO2005026553A1 (en) | 2005-03-24 |
EP1680602B1 (en) | 2015-11-11 |
EP1680602A1 (en) | 2006-07-19 |
ITBO20030528A1 (en) | 2005-03-13 |
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