WO2004048767A1 - Internal combustion engine egr pipe assembly - Google Patents
Internal combustion engine egr pipe assembly Download PDFInfo
- 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
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.
Abstract
An EGR pipe assembly (112) includes an inlet end fitting (125) for connection to an engine exhaust manifold, an outlet end fitting (127) for connection to an EGR control valve and a flexible tube (135) having a convoluted portion (137) between plain cylindrical end portions (136) whose ends are brazed to the end fittings (125) and (127). 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), one end being inserted into a matching end bore (142) in the inlet end fitting (125) 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 (142).
Description
Internal Combustion Engine EGR Pipe Assembly
The invention relates to exhaust gas recirculation (EGR) pipe assemblies for internal combustion engines.
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. In Fig.1 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.
The problem is recognised in US-A-5158061 and US-A-5609144 which both show the use of a telescopic liner pipe to help protect the convoluted pipe. Whilst this may be satisfactory for many purposes, both proposals require the use of metal on metal sliding contact in the liner pipe which can give rise to unwanted wear and noise generation.
It is an object of the present invention to provide an EGR pipe assembly which avoids the problem outlined above.
According to one aspect of the invention there is provided an exhaust gas recirculation
(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 .
Conveniently, 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. Typically, the inlet duct includes an EGR control valve, the outlet body being directly connected to the EGR control valve
The invention will be described by way of example and with further reference to the remainder of the accompanying drawings, of which:-
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; and Fig.5 is a scrap section based on Fig.3 showing a modification
Referring to Figs. 2 to 4, there is shown 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. A significant length of 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. There is a substantial radial clearance or annular gap 151 between the outer surface of the liner tube 141 and the inner surface of the flexible tube 135. The liner tube 141, the flexible tube 135 and the end fittings 125, 127 are typically made from stainless steel, type T321.
In use on the engine 11 , 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. by thermal expansion of the liner tube 141 or movement of one end fitting 125 towards the other 127, 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. However, 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
137, is very much lower, typically 550°C maximum. This keeps the convoluted portion 137 below the temperatures at which hot salt corrosion tends to occur, even though the amount of flexing in the flexible tube 135 is the same. The relatively low temperature of the flexible tube 135 and the unstressed nature of the liner tube 141 avoids the use of high grade, high cost stainless alloys. Under all operating conditions of the engine 11 there is no contact of the liner tube 141 with any other of the components of the EGR pipe assembly 112 (except where it is secured in the inlet end fitting 125) so there is no opportunity for wear or noise from components in abutting or sliding contact.
In the modification shown in Fig.5 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.
While the liner tube 141 has been shown and described as being secured in the inlet end fitting 125, it might, in some circumstances, be fitted in the outlet end fitting 127, with appropriate modifications which might include making the adjacent end of the EGR passage in the inlet end fitting of smaller diameter to form a nozzle which directs the flow into the liner tube. Such an arrangement should not unduly create flow in the space formed by the annular gap 151 between the flexible tube 135 and the liner tube 141.
Claims
1. An exhaust gas recirculation (EGR) pipe assembly (112) for an internal combustion engine (11) having an engine block (13) and inlet duct (16) and an exhaust duct (17, 18) fast with the engine block, the EGR pipe assembly comprising an inlet body (125) adapted to be rigidly connected to the exhaust duct, an outlet body (127) adapted to be rigidly connected to the inlet duct, an EGR passage (133) in the inlet body (125) for the flow of EGR gas from the exhaust duct, an EGR passage (134) in the outlet body (127) for the flow of EGR gas into the inlet duct (16), a flexible convoluted gas-tight tube (135) generally coaxial with the EGR passages (133, 134) and having one end sealed and secured to the inlet body (125) and the other end sealed and secured to the outlet body (127) and a liner tube (141) extending generally coaxially and with a substantial radial clearance through the flexible tube (135) to conduct EGR flow from the inlet body (125) to the outlet body (127), characterised in that the liner tube (141) is rigidly secured at one end to one of said bodies (125 or 127) and has its other end (143) in close non-abutting proximity to the other of said bodies (127 or 125).
2. An EGR pipe assembly according to claim 1 wherein said other end (143) of the liner tube (141) has a small axial clearance with the adjacent body (127).
3. An EGR pipe assembly according to claim 1 wherein said other end (143) of the liner tube (141) extends into the EGR passage (134) of the adjacent end fitting (127) with a substantial radial clearance.
4. An EGR pipe assembly according to and preceding claim wherein the liner tube (141) is rigidly secured at said one end to the inlet body (125).
5. An EGR pipe assembly substantially as described herein with reference to the accompanying drawings.
6. An internal combustion engine (11) having an engine block (13), an inlet duct (16) and an exhaust duct (17, 18) fast with the engine block and an EGR pipe assembly (112) according to any preceding claim connected between the exhaust duct and the inlet duct.
7. An engine according to claim 6 wherein the inlet duct (16) includes an EGR control valve (21), the outlet body (127) being directly connected to the EGR control valve.
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 (en) | 2004-06-10 |
Family
ID=9948658
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB2003/005214 WO2004048767A1 (en) | 2002-11-28 | 2003-11-27 | Internal combustion engine egr pipe assembly |
Country Status (2)
Country | Link |
---|---|
GB (1) | GB2395751A (en) |
WO (1) | WO2004048767A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101289311B1 (en) * | 2011-06-10 | 2013-07-24 | 이정대 | Exhaust Gas Recycling Outlet Pipe and Method for Preparing the Same |
KR101288481B1 (en) * | 2011-06-10 | 2013-07-26 | 이정대 | Exhaust Gas Recycling Outlet Pipe and Method for Preparing the Same |
Citations (7)
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 (en) * | 1993-09-28 | 1995-03-29 | Metex Corporation | Flexible joint for automobile exhaust pipe |
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 (en) * | 1996-02-23 | 1997-08-27 | Witzenmann GmbH Metallschlauch-Fabrik Pforzheim | Flexible connecting element for tubular parts |
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4134466A1 (en) * | 1991-10-18 | 1993-04-22 | Eberspaecher J | DOUBLE-WALLED AIR-INSULATED TUBE FOR EXHAUST SYSTEMS IN VEHICLES |
JPH09317953A (en) * | 1996-05-24 | 1997-12-12 | Mitsubishi Heavy Ind Ltd | Piping structure for reducing thermal stress |
JP4474785B2 (en) * | 2001-03-28 | 2010-06-09 | アイシン精機株式会社 | Exhaust gas recirculation system introduction structure |
-
2002
- 2002-11-28 GB GB0227721A patent/GB2395751A/en not_active Withdrawn
-
2003
- 2003-11-27 WO PCT/GB2003/005214 patent/WO2004048767A1/en active Application Filing
Patent Citations (7)
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 (en) * | 1993-09-28 | 1995-03-29 | Metex Corporation | Flexible joint for automobile exhaust pipe |
US5609144A (en) * | 1996-01-16 | 1997-03-11 | Ford Motor Company | Articulated exhaust gas recirculation supply tube for automotive engine |
EP0791731A1 (en) * | 1996-02-23 | 1997-08-27 | Witzenmann GmbH Metallschlauch-Fabrik Pforzheim | Flexible connecting element for tubular parts |
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101289311B1 (en) * | 2011-06-10 | 2013-07-24 | 이정대 | Exhaust Gas Recycling Outlet Pipe and Method for Preparing the Same |
KR101288481B1 (en) * | 2011-06-10 | 2013-07-26 | 이정대 | Exhaust Gas Recycling Outlet Pipe and Method for Preparing the Same |
Also Published As
Publication number | Publication date |
---|---|
GB2395751A (en) | 2004-06-02 |
GB0227721D0 (en) | 2003-01-08 |
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