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WO2004048767A1 - Conduite de recyclage des gaz d'echappement d'un moteur a combustion interne - Google Patents

Conduite de recyclage des gaz d'echappement d'un moteur a combustion interne Download PDF

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Publication number
WO2004048767A1
WO2004048767A1 PCT/GB2003/005214 GB0305214W WO2004048767A1 WO 2004048767 A1 WO2004048767 A1 WO 2004048767A1 GB 0305214 W GB0305214 W GB 0305214W WO 2004048767 A1 WO2004048767 A1 WO 2004048767A1
Authority
WO
WIPO (PCT)
Prior art keywords
egr
inlet
pipe assembly
liner tube
end fitting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/GB2003/005214
Other languages
English (en)
Inventor
Stuart Morrison
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ford Global Technologies LLC
Original Assignee
Ford Global Technologies LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ford Global Technologies LLC filed Critical Ford Global Technologies LLC
Publication of WO2004048767A1 publication Critical patent/WO2004048767A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/12—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems characterised by means for attaching parts of an EGR system to each other or to engine parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/11—Manufacture or assembly of EGR systems; Materials or coatings specially adapted for EGR systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/50—Arrangements or methods for preventing or reducing deposits, corrosion or wear caused by impurities

Definitions

  • the invention relates to exhaust gas recirculation (EGR) pipe assemblies for internal combustion engines.
  • EGR exhaust gas recirculation
  • Fig.1 of the accompanying drawings is a perspective view showing an internal combustion engine 11 with a typical EGR pipe assembly 12.
  • the engine 11 is a V8 type and has an engine block comprising a crankcase and cylinder block 13 and cylinder heads 14 and 15.
  • An inlet duct for the supply of air into the engine includes a pair of inlet manifolds 16, one for each bank of cylinders, which in Fig.1 are largely obscured by other parts of the air intake system, e.g. intercoolers etc.
  • Each inlet manifold 16 is of generally conventional form and is fast with a respective cylinder head 14, 15.
  • Exhaust ducts in the form of two exhaust manifolds 17 and 18, one for each bank of cylinders, are provided to duct exhaust gas away from the engine 11 through the usual arrangement of exhaust pipes, catalyst assemblies and silencers.
  • a respective EGR control valve 21 is fast with each inlet manifold 16 and is supplied with exhaust gas from a respective exhaust manifold 17 by the respective EGR pipe assembly 12.
  • the EGR control valve 21 and associated EGR pipe assembly 12 for only one bank of cylinders is visible, the corresponding components for the other bank of cylinders being substantially identical .
  • Each EGR pipe assembly 12 comprises an inlet body or end fitting rigidly connected to the exhaust duct, an outlet body or end fitting rigidly connected to the inlet duct, an EGR passage in the inlet body for the flow of EGR gas from the exhaust duct, an EGR passage in the outlet body for the flow of EGR gas into the inlet duct and a flexible gas-tight tube including a convoluted portion generally coaxial with the EGR passages and having its ends welded or brazed to the end fittings.
  • a problem with the typical EGR pipe assembly 12 is that the convoluted pipe portion can reach temperatures of around 750°C. Such temperatures, when combined with the stresses induced by thermal expansion and contraction of the various engine, exhaust and EGR components, are liable to cause hot sail corrosion which shows as grain boundary etching or erosion in the material of the convoluted pipe (typically stainless steel) and failure may occur after prolonged use.
  • EGR pipe assembly for an internal combustion engine having an engine block and inlet and exhaust ducts fast with the engine block
  • the EGR pipe assembly comprising an inlet body adapted to be rigidly connected to the exhaust duct, an outlet body adapted to be rigidly connected to the inlet duct, an EGR passage in the inlet body for the flow of EGR gas from the exhaust duct, an EGR passage in the outlet body for the flow of EGR gas into the inlet duct, a flexible convoluted gas-tight tube generally coaxial with the EGR passages and having one end sealed and secured to the inlet body and the other end sealed and secured to the outlet body and a liner tube extending generally coaxially and with a substantial radial clearance through the flexible tube to conduct EGR flow from the inlet body to the outlet body, wherein the liner tube is rigidly secured at one end to one of said bodies and has its other end in close non-abutting proximity to the other of said bodies.
  • a quantity of stagnant EGR gas is trapped between the liner tube and the flexible tube so that the flexible tube is appreciably cooler than it would otherwise be but there is no sliding or other abutting contact of the liner tube with the other of the inlet and outlet bodies to cause wear or rattles during normal use of the engine .
  • said other end of the liner tube has a small axial clearance with the adjacent body. Otherwise, said other end of the liner tube may extend into the EGR passage of the adjacent end fitting with a substantial radial clearance.
  • the invention also provides, according to another aspect thereof, an internal combustion engine having an engine block, inlet and exhaust ducts fast with the engine block and an EGR pipe assembly according to said one aspect of the invention connected between the exhaust duct and the inlet duct.
  • the inlet duct includes an EGR control valve, the outlet body being directly connected to the EGR control valve
  • Fig.2 is a side elevation of an EGR pipe assembly according to the invention
  • Fig.3 is a cross-section on the line Ill-Ill in Fig.2
  • Fig.4 is a view in the direction of arrow "A" in Fig.2
  • Fig.5 is a scrap section based on Fig.3 showing a modification
  • an EGR pipe assembly 112 which is a direct replacement for that shown in Fig.1 and which includes an inlet body or end fitting 125 having a flange 126 for connection to the exhaust manifold 17, an outlet body or end fitting 127 having a flange 128 for connection to the EGR control valve 21.
  • Each flange 126, 128 has holes 131 , 132 for fixing screws or studs, the holes 131 in flange 126 being elongated to allow for easy assembly to the exhaust manifold 17 without imposing a torsional load in the EGR pipe assembly 112.
  • Each end fitting 125, 127 has a through passage, conveniently referred to as an EGR passage 133, 134, the EGR passage 133 in the inlet end fitting 125 being for the flow of EGR gas from the exhaust manifold 17 and the EGR passage 134 in the outlet end fitting 127 being for the flow of EGR gas into the EGR control valve 21 and hence into the inlet manifold 16.
  • a flexible gas-tight tube 135 having plain cylindrical end portions 136 and an intermediate convoluted portion 137 has its ends sealed and secured to the end fittings 125 and 127 by, brazing, welding or other convenient means and is generally coaxial with the EGR passages 133 and 134.
  • each end portion 136 extends over the adjacent cylindrical end portion of the respective end fitting 125, 127 for location and alignment.
  • a liner tube 141 extends generally coaxially through the flexible tube 135 to conduct EGR flow from the inlet end fitting 125 to the outlet end fitting 127, the end adjacent the inlet end fitting being inserted into a matching end bore 142 in the EGR passage 133 and rigidly secured by brazing.
  • the other end of the liner tube 141 is in close non-abutting proximity to the outlet end fitting 127, its end face 143 having a small axial clearance "b" with the adjacent end face 144 of the end fitting 127.
  • the adjacent end of the EGR passage 134 in the outlet end fitting 127 has a generally cylindrical recess 145.
  • the liner tube 141, the flexible tube 135 and the end fittings 125, 127 are typically made from stainless steel, type T321.
  • the EGR pipe assembly 112 is required to accommodate the dimensional variations in distance and angle between the interface of the flange 126 with the exhaust manifold 17 and the interface of the flange 128 with the EGR valve 21 as the engine is operated between extremes such as full load, idle and static cold soak.
  • the convoluted portion 137 of the tube 135 flexes to accommodate these dimensional variations but the liner tube 141 stays rigid with the inlet end fitting 125 so that its end adjacent the outlet end fitting 127 moves relative to it, such movement being unrestricted by virtue of the clearance "b". If the clearance "b" is taken up, e.g.
  • the recess 145 can accommodate such dimensional variations by providing additional radial clearance.
  • EGR gas passing through the EGR pipe assembly 112 heats the end fittings 125, 127 and the liner tube 141 to a temperature of around 750 °C.
  • the annular gap 151 between the liner tube 141 and the flexible tube 135 protects the flexible tube from the main flow of EGR gas, the gas trapped in the space formed by the annular gap being relatively stagnant.
  • the flexible tube 135 can dissipate heat by radiation and by convection to the surrounding atmosphere so that its temperature, particularly in the convoluted portion
  • the recess 145 is deeper than that shown in Figs. 2 to 4 and the adjacent end of the liner tube 141 extends part way into the recess.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

La présente invention concerne une conduite de recyclage des gaz d'échappement (112) comprenant un embout d'entrée (125) destiné à être connecté à un collecteur d'échappement du moteur, un embout de sortie (127) destiné à être connecté à une soupape de commande de recyclage des gaz d'échappement, et un tube flexible (135) présentant une partie spiralée (137) entre des parties d'extrémité cylindriques (136) dont les extrémités sont soudées sur les embouts (125) et (127). Une gaine (141) s'étend de façon généralement coaxiale à l'intérieur du tube flexible (135) pour conduire le flux de gaz d'échappement à recycler de l'embout d'entrée (125) à l'embout de sortie (127), une extrémité étant insérée dans un orifice d'extrémité correspondant (142) pratiqué dans l'embout d'entrée (125) et fixé de façon rigide par soudure. L'autre extrémité de la gaine (141) se trouve à proximité de l'embout de sortie (127), sans être contigu à celui-ci, sa face d'extrémité (143) ayant un petit jeu axial 'b' avec la face d'extrémité adjacente (144) de l'embout (142).
PCT/GB2003/005214 2002-11-28 2003-11-27 Conduite de recyclage des gaz d'echappement d'un moteur a combustion interne Ceased WO2004048767A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0227721A GB2395751A (en) 2002-11-28 2002-11-28 Internal Combustion Engine EGR Pipe Assembly
GB0227721.8 2002-11-28

Publications (1)

Publication Number Publication Date
WO2004048767A1 true WO2004048767A1 (fr) 2004-06-10

Family

ID=9948658

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2003/005214 Ceased WO2004048767A1 (fr) 2002-11-28 2003-11-27 Conduite de recyclage des gaz d'echappement d'un moteur a combustion interne

Country Status (2)

Country Link
GB (1) GB2395751A (fr)
WO (1) WO2004048767A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101289311B1 (ko) * 2011-06-10 2013-07-24 이정대 배기가스 재순환 출구 파이프 및 그 제조방법
KR101288481B1 (ko) * 2011-06-10 2013-07-26 이정대 배기가스 재순환 출구 파이프 및 그 제조방법

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5158061A (en) * 1991-11-29 1992-10-27 Ford Motor Company Exhaust gas recirculation supply tube for automotive engine
EP0645528A1 (fr) * 1993-09-28 1995-03-29 Metex Corporation Raccord flexible pour un tuyau d'échappement d'automobile
US5437479A (en) * 1992-10-06 1995-08-01 Feodor Burgmann Dichtungswerke Gmbh & Co. Flexible connection arrangement for the two pipe portions particularly for motor vehicle exhausts
US5609144A (en) * 1996-01-16 1997-03-11 Ford Motor Company Articulated exhaust gas recirculation supply tube for automotive engine
EP0791731A1 (fr) * 1996-02-23 1997-08-27 Witzenmann GmbH Metallschlauch-Fabrik Pforzheim Elément de conduite flexible pour éléments tubulaires
US5775737A (en) * 1996-06-25 1998-07-07 Feodor Burgmann Dichtungswerke Gmbh & Co. Conduit vibration decoupling device
US6240969B1 (en) * 1999-02-05 2001-06-05 Witzenmann Gmbh Metallschlauch-Fabrik Pforzheim Conduit element for exhaust gas conduits of motor vehicles

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4134466A1 (de) * 1991-10-18 1993-04-22 Eberspaecher J Doppelwandiges luftisoliertes rohr fuer abgasanlagen in fahrzeugen
JPH09317953A (ja) * 1996-05-24 1997-12-12 Mitsubishi Heavy Ind Ltd 熱応力を低減させる配管構造
JP4474785B2 (ja) * 2001-03-28 2010-06-09 アイシン精機株式会社 排気ガス還流装置導入部構造

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5158061A (en) * 1991-11-29 1992-10-27 Ford Motor Company Exhaust gas recirculation supply tube for automotive engine
US5437479A (en) * 1992-10-06 1995-08-01 Feodor Burgmann Dichtungswerke Gmbh & Co. Flexible connection arrangement for the two pipe portions particularly for motor vehicle exhausts
EP0645528A1 (fr) * 1993-09-28 1995-03-29 Metex Corporation Raccord flexible pour un tuyau d'échappement d'automobile
US5609144A (en) * 1996-01-16 1997-03-11 Ford Motor Company Articulated exhaust gas recirculation supply tube for automotive engine
EP0791731A1 (fr) * 1996-02-23 1997-08-27 Witzenmann GmbH Metallschlauch-Fabrik Pforzheim Elément de conduite flexible pour éléments tubulaires
US5775737A (en) * 1996-06-25 1998-07-07 Feodor Burgmann Dichtungswerke Gmbh & Co. Conduit vibration decoupling device
US6240969B1 (en) * 1999-02-05 2001-06-05 Witzenmann Gmbh Metallschlauch-Fabrik Pforzheim Conduit element for exhaust gas conduits of motor vehicles

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101289311B1 (ko) * 2011-06-10 2013-07-24 이정대 배기가스 재순환 출구 파이프 및 그 제조방법
KR101288481B1 (ko) * 2011-06-10 2013-07-26 이정대 배기가스 재순환 출구 파이프 및 그 제조방법

Also Published As

Publication number Publication date
GB0227721D0 (en) 2003-01-08
GB2395751A (en) 2004-06-02

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