WO2008156695A1 - Exhaust manifold having improved nvh characteristics - Google Patents
Exhaust manifold having improved nvh characteristics Download PDFInfo
- Publication number
- WO2008156695A1 WO2008156695A1 PCT/US2008/007440 US2008007440W WO2008156695A1 WO 2008156695 A1 WO2008156695 A1 WO 2008156695A1 US 2008007440 W US2008007440 W US 2008007440W WO 2008156695 A1 WO2008156695 A1 WO 2008156695A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- housing
- tubes
- exhaust manifold
- half shell
- flange
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/18—Construction facilitating manufacture, assembly, or disassembly
- F01N13/1888—Construction facilitating manufacture, assembly, or disassembly the housing of the assembly consisting of two or more parts, e.g. two half-shells
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/08—Other arrangements or adaptations of exhaust conduits
- F01N13/10—Other arrangements or adaptations of exhaust conduits of exhaust manifolds
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2230/00—Combination of silencers and other devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2470/00—Structure or shape of gas passages, pipes or tubes
- F01N2470/02—Tubes being perforated
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49398—Muffler, manifold or exhaust pipe making
Definitions
- This invention generally relates to an exhaust manifold that may be incorporated into an internal combustion engine, and more particularly to an exhaust manifold having exhaust tubes within an exhaust manifold housing that may improve noise, vibration and harness characteristics of the manifold housing.
- a cylinder head In an internal combustion engine, a cylinder head is positioned atop an engine block having cylinders (or combustion chambers) extending therethrough. Upper portions of each combustion chamber extend through the cylinder head, where the upper portion of each combustion chamber corresponds with each cylinder of the engine block.
- the cylinder head may also house intake valves, exhaust valves, camshaft(s), rocker arms and pushrods, and numerous other mechanisms as is known in the art.
- an intake manifold and an exhaust manifold are typically coupled to the cylinder head.
- the intake manifold is typically located between the carburetor and the cylinder head to supply an air-fuel mixture to each combustion chamber through internal intake ports in the cylinder head.
- the intake manifold contains fuel injectors that supply an air-fuel mixture to each combustion chamber.
- the exhaust manifold is typically coupled to the side of the cylinder head opposite the intake manifold (i.e. the "exhaust side").
- the exhaust manifold collects exhaust gases exiting from each combustion chamber through internal exhaust ports in the cylinder head.
- the exhaust manifold then transfers the exhaust gases to an exhaust pipe of an exhaust system.
- the exhaust manifold is coupled to the cylinder head at the exhaust ports of the cylinder head such that the exhaust manifold collects exhaust gases exiting each combustion chamber within the manifold housing and transfers the exhaust gases to the exhaust pipe.
- the NVH problems present objectionable noise and vibration from the exhaust pulses.
- the NVH passes from the manifold housing into the engine compartment, and ultimately onto the passenger compartment.
- the sharing of exhaust pulses among cylinders via the exhaust manifold i.e. "cross-talk" may compound the NVH problems and may result in further objectionable noise and vibration.
- the NVH transmitted and experienced by the passengers is bothersome and undesirable.
- the exhaust manifold assembly may consist of an upper half shell secured to a lower half shell to form a housing.
- the upper half shell and/or the lower half shell may have one or more tubes extending within the interior of the housing.
- An inlet flange and an outlet flange may be attached to one of the shells.
- the inlet flange may be attached to a cylinder head to receive exhaust gases from the cylinder head.
- the exhaust gases may be received by the one or more tubes.
- the improved exhaust manifold assembly may reduce NVH.
- FIG. 1 is a cross-sectional view of an embodiment of an exhaust manifold in accordance with the present invention.
- the manifold 10 may include a lower half shell 20 and an upper half shell (not shown).
- the lower half shell 20 and the upper half shell may be integrally formed, attached, such as by welding or fastening, or otherwise joined together.
- the upper half shell and the lower half shell 20 may be joined to define a housing 25.
- the housing 25 may be defined between the upper half shell and the lower half shell 20.
- the housing 25 may have an outlet flange 40 providing fluid communication between an interior 15 of the housing 25 and an exterior 16 of the housing 25.
- the outlet flange 40 may have an opening 55 permitting fluid communication between the remainder of the exhaust system and the housing 25.
- the outlet flange 40 may be sized and shaped for attachment to a remaining portion of the exhaust system (e.g. exhaust piping, turbocharger, etc.).
- the outlet flange 40 may be connected to the housing 25, such as to the upper half shell and/or the lower half shell 20.
- the outlet flange 40 may be coupled to a first side 36 of the housing 25.
- the outlet flange 40 may be integrally formed with the lower half shell 20 and/or the upper half shell.
- the outlet flange 40 may be a separate piece which is secured to one of or both of the half shells via, for example fasteners, a press-fit, welding, brazing, an adhesive or the like.
- the upper half shell may have a portion of the outlet flange 40
- the lower half shell 20 may have a corresponding portion of the outlet flange 40 such that joining the upper half shell and the lower half shell 20 results in formation of the outlet flange 40.
- An inlet flange 30 may be connected to the housing 25.
- the inlet flange 30 may be secured to one of or both of the upper half shell and the lower half shell 20 by way of fasteners, a press-fit, welding, brazing, an adhesive or in another manner that will be appreciated by a person of ordinary skill in the art.
- the inlet flange 30 may be integrally formed with the upper half shell or the lower half shell 20 or may be separately connected to the housing 25.
- the inlet flange 30 may be formed by the joining of the upper shell and the lower half shell 20.
- the upper half shell may have a portion of the inlet flange 30 and the lower half shell 20 may have a corresponding portion of the inlet flange 30 such that joining the upper half shell and the lower half shell 20 results in formation of the inlet flange 30.
- the inlet flange 30 may be positioned adjacent to or at a second side 35 of the housing 25, which may be adjacent to the manifold 10.
- the second side 35 of the housing 25 may be opposite to the first side 36 of the housing 25 where the outlet flange 40 may be attached.
- the inlet flange 20 may be secured to the exhaust side of a cylinder head, for example.
- the inlet flange 30 may comprise one or more openings 50 (or apertures).
- Each of the openings 50 may provide fluid communication between the interior 15 of the housing 25 and the exterior 16 of the housing 25.
- the openings 50 may transmit exhaust gases from the cylinder head into the housing 25.
- the number of the openings 50 may correspond to the number of the exhaust ports in the cylinder head.
- the number of the openings 50 may be greater than or less than the number of the exhaust ports in the cylinder head.
- the inlet flange 30 may have at least one of the openings 50 receiving exhaust gases from two or more of the exhaust ports of the cylinder head.
- the inlet flange 30 may have at least two of the openings 50 receiving exhaust gases from one of the exhaust ports of the cylinder head.
- a person of ordinary skill in the art should not be deemed as limited to any number of the openings 50.
- the inlet flange 30 may have any number of the openings 50 and may attach to the cylinder head in any manner capable of transmitting exhaust gases from a cylinder head to the interior of the housing 25.
- One or more tubes (or pipes) 60 may be positioned within the housing 25.
- the one or more tubes 60 are hereinafter referred to as "the tubes 60" for simplicity and clarity purposes and not to limit the present invention to requiring two or more of the tubes 60. It is clearly contemplated that "the tubes 60" may consist of a single tube.
- the tubes 60 may be any shape capable of transmitting fluids, such as exhaust gases therethrough.
- the tubes 60 may be cylindrical pipes for transmitting fluids through the housing 25.
- the tubes 60 may be separated from one another such that NVH, such as noise and vibrations from one of the tubes 60 is not transmitted to another one of the tubes 60.
- the tubes 60 may absorb the NVH and dampen the NVH felt or otherwise received by the upper half shell and the lower half shell 20.
- Each of the tubes 60 may be attached to the inlet flange 30, the outlet flange 40, and/or the housing 25.
- the tubes 60 may be secured within the housing 25 via fasteners, a press-fit, welding, brazing, an adhesive or the like.
- the tubes 60 may be attached to or connected to the housing 25 to support the tubes, for example.
- the tubes 60 may simply rest on any suitable surface within the housing 25 or rest on mesh rings or pads 70 positioned between each tube 60 and any suitable surface within the housing 25.
- the pads 70 may be attached to the upper half shell or the lower half shell 20 to support the tubes 60.
- the tubes 60 may be attached at the openings 50 of the inlet flange 30.
- the tubes 60 may extend from the inlet flange 30 to the outlet flange 40.
- the tubes 60 may be attached to the inlet flange 30 and the outlet flange 40.
- the tubes 60 may be die cast or formed by other methods and processes known to those skilled in the art.
- the upper half shell and the lower half shell 20 may be die cast or overmolded around the tubes 60.
- the tubes 60 may be positioned within a mold at predetermined angles and lengths.
- the upper half shell and/or the lower half shell 20 may be cast with the tubes 60.
- the tubes 60 may be integrally formed with the upper half shell and/or the lower half shell 20.
- each of the tubes 60 is secured to the inlet flange 30 and terminates within the housing 25, without attachment to the outlet flange 40.
- the tubes 60 may terminate a distance from the outlet flange 40. hi such an example, the distance may be sufficient for the exhaust gases to mix within the interior 15 of the housing 25 prior to exiting at the outlet flange 40. Termination of the tubes 60 short of the opening 55 of the outlet flange 40 may permit the exhaust gases exiting the tubes 60 to mix within the housing 25 prior to passing through the opening 55 and onto other components of the exhaust assembly, such as a HEGO sensor and/or catalytic converter. Properly mixing the exhaust gases within the housing 25 prior to exiting at the outlet flange 40 may reduce inaccurate emission readings and limit problems with emissions controls.
- the tubes 60 may be attached to the outlet flange 40 without attachment to the inlet flange 30.
- the tubes 60 may extend from the outlet flange 40 towards the inlet flange 30 and terminate a distance from the inlet flange 30.
- the tubes 60 may extend within the housing 25 without attachment to the inlet flange 30 and the outlet flange 40 in another embodiment of the present invention, hi such an embodiment, the tubes 60 may terminate a first distance from the inlet flange 30 and a second distance from the outlet flange 40. The first distance may be substantially similar to or different from the second distance.
- the tubes 60 may combine embodiments herein described. For example, one of the tubes 60 may be attached to the inlet flange 30, and another one of the tubes 60 may not be attached to the inlet flange 30 and the outlet flange 40. To this end, the tubes 60 may have different lengths and dimensions.
- the tubes 60 may have a wall structure 62 for preventing or at least limiting fluid communication from an interior 64 of the tubes 60 to the interior 15 of the housing 25.
- the wall structure 62 of the tubes 60 may be metallic, plastic, or other material, preferably capable of transmitting relatively high temperature fluids therethrough.
- the wall structure 62 may have one or more layers separating an interior 64 of the tubes 60 from the interior 15 of the housing 25.
- the wall structure 62 may have one or more apertures or perforations (not shown) for permitting fluid communication from the interior 64 of the tubes 60 into the interior 15 of the housing 25.
- the perforations (or apertures) may provide limited fluid communication to the interior 15 of the housing 25 such that a portion of the exhaust gases exit the tubes 60 into the interior 15 of the housing 25.
- the tubes 60 may be arranged such that exhaust gases flow through each of the tubes 60 towards the opening 55 of the outlet flange 40.
- the tubes 60 may capture exhaust pulses exiting the cylinders thereby insulating the outer shell of manifold 10 from sound waves associated with these exhaust pulses leading to NVH improvement of the manifold 10 and vehicle as a whole.
- the tubes 60 may allow more flow separation of exhaust gases exiting each cylinder thereby significantly reducing, or even eliminating, NVH problems from cross-talk among cylinders.
- the tubes 60 may also absorb thermal energy from the exhaust gases thereby reducing thermal energy transferred to and absorbed by other components of the manifold 10 thus improving overall durability of the manifold 10.
- the tubes 60 may be configured to provide additional NVH benefits, such as damping noise and vibration within the manifold 10 and/or tuning the manifold 10 to enhance the sound quality of the exhaust system and the entire vehicle.
- additional NVH benefits such as damping noise and vibration within the manifold 10 and/or tuning the manifold 10 to enhance the sound quality of the exhaust system and the entire vehicle.
- some degree of tuning and/or damping may be possible by the appropriate selection of various physical characteristics of each tube 60, such as length, cross-sectional shape, endform, wall structure, tube wall thickness, perforations or apertures in the wall structure of the tubes 60, material composition, or the like.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112008001638T DE112008001638T5 (en) | 2007-06-13 | 2008-06-13 | Exhaust or exhaust manifold with improved NVH properties |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US93437607P | 2007-06-13 | 2007-06-13 | |
US60/934,376 | 2007-06-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2008156695A1 true WO2008156695A1 (en) | 2008-12-24 |
Family
ID=40156531
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2008/007440 WO2008156695A1 (en) | 2007-06-13 | 2008-06-13 | Exhaust manifold having improved nvh characteristics |
Country Status (4)
Country | Link |
---|---|
US (1) | US20090007552A1 (en) |
KR (1) | KR20100066430A (en) |
DE (1) | DE112008001638T5 (en) |
WO (1) | WO2008156695A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009030937A1 (en) * | 2009-06-24 | 2011-01-05 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Exhaust manifold, has primary exhaust gas pipe permeating connection region of collector and projecting into hollow space defined by collector, where exhaust gas is discharged from cylinders via pipes and fed to collector |
JP5890257B2 (en) * | 2012-06-06 | 2016-03-22 | フタバ産業株式会社 | Exhaust system parts |
EP2961956B1 (en) * | 2013-02-28 | 2019-06-12 | Faurecia Emissions Control Technologies, USA, LLC | Exhaust manifold with turbo support |
US8910470B2 (en) | 2013-05-17 | 2014-12-16 | Ford Global Technologies, Llc | Exhaust system having a flow rotation element and method for operation of an exhaust system |
US9238992B2 (en) | 2013-05-17 | 2016-01-19 | Ford Global Technologies, Llc | Exhaust system having a flow rotation element and method for operation of an exhaust system |
DE102014103820A1 (en) * | 2014-03-20 | 2015-09-24 | Benteler Automobiltechnik Gmbh | Exhaust manifold for an exhaust system of an internal combustion engine |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5572868A (en) * | 1994-02-21 | 1996-11-12 | Aisin Takaoka Co., Ltd. | Exhaust manifold |
US6247552B1 (en) * | 1994-12-16 | 2001-06-19 | J. Eberspächer Gmbh & Co. | Air gap-insulated exhaust manifold |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3798769A (en) * | 1972-01-25 | 1974-03-26 | Mc Culloch Corp | Apparatus for reducing the operating noise of a chain saw |
US5373119A (en) * | 1990-11-23 | 1994-12-13 | Kioritz Corporation | Exhaust muffler for internal combustion engine |
JP3349089B2 (en) * | 1997-08-08 | 2002-11-20 | 株式会社日本自動車部品総合研究所 | exhaust manifold |
WO2006035188A1 (en) * | 2004-09-29 | 2006-04-06 | Renault S.A.S. | Double-walled exhaust manifold |
-
2008
- 2008-06-13 DE DE112008001638T patent/DE112008001638T5/en not_active Withdrawn
- 2008-06-13 US US12/157,790 patent/US20090007552A1/en not_active Abandoned
- 2008-06-13 WO PCT/US2008/007440 patent/WO2008156695A1/en active Application Filing
- 2008-06-13 KR KR1020107000659A patent/KR20100066430A/en not_active Application Discontinuation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5572868A (en) * | 1994-02-21 | 1996-11-12 | Aisin Takaoka Co., Ltd. | Exhaust manifold |
US6247552B1 (en) * | 1994-12-16 | 2001-06-19 | J. Eberspächer Gmbh & Co. | Air gap-insulated exhaust manifold |
Also Published As
Publication number | Publication date |
---|---|
DE112008001638T5 (en) | 2011-02-17 |
KR20100066430A (en) | 2010-06-17 |
US20090007552A1 (en) | 2009-01-08 |
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