FR2926845A1 - Flexible exhaust pipe element for motor vehicle, has flexible inner and outer tubes maintained in relative position by end flanges, where inner tube defines central passage, and annular channel formed between inner and outer tubes - Google Patents

Flexible exhaust pipe element for motor vehicle, has flexible inner and outer tubes maintained in relative position by end flanges, where inner tube defines central passage, and annular channel formed between inner and outer tubes Download PDF

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Publication number
FR2926845A1
FR2926845A1 FR0850449A FR0850449A FR2926845A1 FR 2926845 A1 FR2926845 A1 FR 2926845A1 FR 0850449 A FR0850449 A FR 0850449A FR 0850449 A FR0850449 A FR 0850449A FR 2926845 A1 FR2926845 A1 FR 2926845A1
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France
Prior art keywords
exhaust
outer tubes
flexible
tubes
exhaust pipe
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.)
Pending
Application number
FR0850449A
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French (fr)
Inventor
Erwann Gaiffas
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.)
Renault SAS
Original Assignee
Renault SAS
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Filing date
Publication date
Application filed by Renault SAS filed Critical Renault SAS
Priority to FR0850449A priority Critical patent/FR2926845A1/en
Publication of FR2926845A1 publication Critical patent/FR2926845A1/en
Pending legal-status Critical Current

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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
    • F01N13/1805—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body
    • F01N13/1811—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body with means permitting relative movement, e.g. compensation of thermal expansion or vibration
    • F01N13/1816—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body with means permitting relative movement, e.g. compensation of thermal expansion or vibration the pipe sections being joined together by flexible tubular elements only, e.g. using bellows or strip-wound pipes
    • 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
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/06—Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor
    • 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
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
    • F02M26/15—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system in relation to engine exhaust purifying apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L11/00—Hoses, i.e. flexible pipes
    • F16L11/20—Double-walled hoses, i.e. two concentric hoses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L11/00—Hoses, i.e. flexible pipes
    • F16L11/22—Multi-channel hoses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L27/00—Adjustable joints, Joints allowing movement
    • F16L27/10—Adjustable joints, Joints allowing movement comprising a flexible connection only, e.g. for damping vibrations
    • F16L27/1004—Adjustable joints, Joints allowing movement comprising a flexible connection only, e.g. for damping vibrations introduced in exhaust pipes for hot gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/18—Double-walled pipes; Multi-channel pipes or pipe assemblies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/18—Double-walled pipes; Multi-channel pipes or pipe assemblies
    • F16L9/19—Multi-channel pipes or pipe assemblies
    • 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
    • F01N2470/08—Gas passages being formed between the walls of an outer shell and an inner chamber
    • 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
    • F01N2470/24—Concentric tubes or tubes being concentric to housing, e.g. telescopically assembled
    • 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
    • F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
    • F02M26/21—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system with EGR valves located at or near the connection to the intake system

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Exhaust Silencers (AREA)

Abstract

The element (4) has two metallic flexible coaxial inner and outer tubes (41, 42) maintained in relative position by end flanges (43) provided with passage holes (44), where the tube (41) defines a central passage (46), and an annular channel (45) is formed between the tubes. The passage allows the passing of exhaust gas from an engine towards an exhaust line. The channel allows the passing of recirculated gas from the exhaust line towards the engine.

Description

Elément de conduite d'échappement flexible, et ensemble de motorisation comportant un tel élément, notamment pour un véhicule avec circuit de recirculation des gaz d'échappement. La présente invention concerne un élément e conduite d'échappement flexible, notamment pour un véhicule automobile, disposée entre un moteur et une ligne d'échappement. Flexible exhaust pipe element, and motor assembly comprising such an element, in particular for a vehicle with exhaust gas recirculation circuit. The present invention relates to a flexible exhaust pipe element, especially for a motor vehicle, disposed between a motor and an exhaust line.

Dans des installations comportant un circuit de recirculation des gaz d'échappement, couramment appelé EGR , à basse pression, dont la prise de gaz est située dans la ligne d'échappement après un dispositif de post-traitement des gaz d'échappement, il faut assurer le retour de ces gaz vers l'admission d'air du moteur. Il est donc nécessaire d'avoir deux circuits séparés pour permettre la circulation de ces deux flux de gaz d'échappement. On connaît déjà des flexibles d'échappement doubles à flux parallèles. Mais une telle disposition où les deux éléments de conduits sont disposés l'un à côté de l'autre, même si chacun garde sa flexibilité propre, a tendance à limiter les possibilités de mouvements relatifs entre moteur et ligne d'échappement. In installations comprising an exhaust gas recirculation circuit, commonly called EGR, at low pressure, whose gas intake is located in the exhaust line after an aftertreatment device of the exhaust gases, it is necessary to ensure the return of these gases to the engine air intake. It is therefore necessary to have two separate circuits to allow the circulation of these two streams of exhaust gas. Double exhaust hoses with parallel flows are already known. But such an arrangement where the two duct elements are arranged next to each other, even if each keeps its own flexibility, tends to limit the possibilities of relative movements between engine and exhaust line.

La présente invention vise à résoudre ce problème et à améliorer le découplage entre ligne d'échappement et moteur dans des systèmes comportant un circuit de recirculation des gaz d'échappement à basse pression. The present invention aims to solve this problem and to improve the decoupling between the exhaust line and the engine in systems comprising a low-pressure exhaust gas recirculation circuit.

Avec ces objectifs en vue, l'invention a pour objet un élément de conduite d'échappement flexible, notamment pour un véhicule avec circuit de recirculation des gaz d'échappement, caractérisé en ce qu'il comporte deux tubes flexibles coaxiaux définissant un passage central dans le tube intérieur et un canal annulaire entre les deux tubes. With these objectives in view, the invention relates to a flexible exhaust pipe element, in particular for a vehicle with exhaust gas recirculation circuit, characterized in that it comprises two coaxial flexible tubes defining a central passage in the inner tube and an annular channel between the two tubes.

Une telle disposition permet de conserver une flexibilité optimale avec un effet de rotule, c'est-à-dire que la liaison entre moteur et ligne d'échappement et mobile dans toutes les directions, sans brider une possibilité de mouvement comme cela se produit si deux tubes sont disposés en parallèle. Such an arrangement allows to maintain optimal flexibility with a ball joint effect, that is to say that the connection between the engine and exhaust line and mobile in all directions, without restricting a possibility of movement as occurs if two tubes are arranged in parallel.

L'invention a aussi pour objet un ensemble de motorisation comportant un moteur, une ligne d'échappement, un circuit de recirculation des gaz d'échappement, caractérisé en ce qu'il comporte un élément de conduite d'échappement flexible formé de deux tubes flexibles coaxiaux, définissant respectivement un passage pour les gaz d'échappement du moteur vers la ligne d'échappement et un passage pour les gaz recirculés de la ligne d'échappement vers le moteur. The invention also relates to an engine assembly comprising a motor, an exhaust line, an exhaust gas recirculation circuit, characterized in that it comprises a flexible exhaust pipe element formed of two tubes. coaxial hoses, respectively defining a passage for engine exhaust gases to the exhaust line and a passage for recirculated gases from the exhaust line to the engine.

Préférentiellement, les gaz d'échappement du moteur vers la ligne d'échappement passent dans le tube central et les gaz recirculés passent dans l'espace annulaire entre les deux tubes. Preferably, the exhaust gas from the engine to the exhaust line passes through the central tube and the recirculated gases pass into the annular space between the two tubes.

D'autres caractéristiques et avantages apparaîtront dans la description qui va être faite d'un élément de flexible d'échappement conforme à l'invention et de son utilisation dans un ensemble de motorisation avec recirculation des gaz d'échappement à basse pression. Other features and advantages will become apparent in the description that will be made of an exhaust hose element according to the invention and its use in a motor assembly with recirculation of low pressure exhaust gas.

On se reportera aux dessins annexés dans lesquels : 35 - la figure 1 est une vue de l'ensemble de motorisation, - la figure 2 est une vue en coupe axiale de l'élément de conduite d'échappement selon l'invention, - la figure 3 est une vue en bout de cet élément. Referring to the accompanying drawings in which: - Figure 1 is a view of the motor assembly, - Figure 2 is an axial sectional view of the exhaust pipe element according to the invention, - the Figure 3 is an end view of this element.

L'ensemble de motorisation représenté figure 1 comporte un moteur 1 pourvu du répartiteur d'admission 11, et une ligne d'échappement 2 dont on a représenté que l'élément de post-traitement des gaz 21. Le circuit de recirculation des gaz d'échappement à basse pression comporte un premier tuyau 31 piqué sur une tuyauterie d'échappement 22 en aval de l'élément de post-traitement 21, et un deuxième tuyau 32 relié au répartiteur d'admission 11. The motor assembly shown in FIG. 1 comprises a motor 1 provided with the intake distributor 11, and an exhaust line 2, which has been shown as the post-treatment element for the gases 21. The recirculation circuit of the gases low pressure exhaust includes a first pipe 31 stitched on an exhaust pipe 22 downstream of the post-treatment element 21, and a second pipe 32 connected to the inlet distributor 11.

Une première tubulure d'échappement 23 est liée rigidement au moteur, et une deuxième tubulure 24 est liée rigidement à l'élément de post-traitement 21. A first exhaust pipe 23 is rigidly connected to the engine, and a second pipe 24 is rigidly connected to the post-treatment element 21.

Un élément de liaison 4 flexible est formé de deux tubes flexibles coaxiaux, par exemple métalliques : un tube intérieur 41 et un tube extérieur 42, maintenus en position relative par exemple par des brides d'extrémité 43 comportant des lumières de passage 44. L'élément de liaison 4 est placé entre d'une part la première tubulure d'échappement 23 et le deuxième tuyau 32 du circuit de recirculation et, d'autre part, la deuxième tubulure 24 et le premier tuyau 31 du circuit de recirculation. A flexible connecting element 4 is formed of two coaxial flexible tubes, for example metallic tubes: an inner tube 41 and an outer tube 42, held in relative position for example by end flanges 43 having passage apertures 44. connecting element 4 is placed between on the one hand the first exhaust pipe 23 and the second pipe 32 of the recirculation circuit and, on the other hand, the second pipe 24 and the first pipe 31 of the recirculation circuit.

Les brides 43 sont fixées respectivement sur des contre-brides 15 et 25 respectivement solidaires de la première tubulure d'échappement 23 et de et la deuxième tubulure 24, de sorte que le tube intérieur 41 de l'élément de liaison 4 est connecté de manière étanche entre la première tubulure d'échappement 23 et la deuxième tubulure 24. Par ailleurs, le premier tuyau 31 du circuit de recirculation est connecté à la contre-bride 25 et le deuxième tuyau 32 du circuit de recirculation est connecté à la contre-bride 15, de sorte que les dits premier et deuxième tuyau du circuit de recirculation soient reliés de manière étanche par le canal annulaire 45 déterminé entre les deux tubes flexibles 41 et 42. The flanges 43 are fixed respectively on counter-flanges 15 and 25 respectively integral with the first exhaust pipe 23 and with and the second pipe 24, so that the inner pipe 41 of the connecting element 4 is connected in such a way that between the first exhaust pipe 23 and the second pipe 24. Furthermore, the first pipe 31 of the recirculation circuit is connected to the counter-flange 25 and the second pipe 32 of the recirculation circuit is connected to the counter-flange. 15, so that said first and second pipes of the recirculation circuit are sealingly connected by the annular channel 45 determined between the two flexible tubes 41 and 42.

Ainsi, le comme on le voit figure 1, le flux de gaz d'échappement sortant du moteur passe dans le passage central 46 du tube intérieur 41, et le flux de gaz remontant de la ligne d'échappement vers le répartiteur d'admission passe dans le canal annulaire 45 entre le tube intérieur 41 et le tube extérieur 42. Thus, as shown in FIG. 1, the flow of exhaust gas leaving the engine passes through the central passage 46 of the inner tube 41, and the flow of gas going up from the exhaust line to the intake distributor passes in the annular channel 45 between the inner tube 41 and the outer tube 42.

Les déplacements relatifs entre le moteur et la ligne d'échappement sont absorbés par les déformations de l'élément de liaison permises par la flexibilité des deux tubes 41 et 42, flexibilité qui, parce que les tubes sont coaxiaux, est identique dans toutes les directions. The relative displacements between the engine and the exhaust line are absorbed by the deformations of the connecting element permitted by the flexibility of the two tubes 41 and 42, flexibility which, because the tubes are coaxial, is identical in all directions .

Claims (7)

REVENDICATIONS 1. Elément de conduite d'échappement flexible, notamment pour un véhicule avec circuit de recirculation des gaz d'échappement, caractérisé en ce qu'il comporte deux tubes flexibles coaxiaux (41 ; 42) définissant un passage central (46) dans le tube intérieur et un canal annulaire (45) entre les deux tubes. A flexible exhaust pipe element, in particular for a vehicle with an exhaust gas recirculation circuit, characterized in that it comprises two coaxial flexible tubes (41; 42) defining a central passage (46) in the tube. interior and an annular channel (45) between the two tubes. 2. Elément de conduite d'échappement selon la revendication 1, caractérisé en ce que les tubes flexibles coaxiaux comportent un tube intérieur (41) et un tube extérieur (42), maintenus en position relative par des brides d'extrémité (43) comportant des lumières de passage (44). Exhaust pipe element according to claim 1, characterized in that the coaxial flexible tubes comprise an inner tube (41) and an outer tube (42), held in relative position by end flanges (43) comprising passing lights (44). 3. Elément de conduite d'échappement selon la revendication 1, caractérisé en ce que les tubes flexibles coaxiaux (41 ; 42) sont métalliques. Exhaust pipe element according to claim 1, characterized in that the coaxial flexible tubes (41; 42) are metallic. 4. Ensemble de motorisation comportant un moteur (1), une ligne d'échappement (2), un circuit (31, 32) de recirculation des gaz d'échappement, caractérisé en ce qu'il comporte un élément (4) de conduite d'échappement flexible formé de deux tubes flexibles coaxiaux (41 ; 42), définissant respectivement un passage (46) pour les gaz d'échappement du moteur vers la ligne d'échappement et un passage (45) pour les gaz recirculés de la ligne d'échappement vers le moteur. 4. Motorization assembly comprising a motor (1), an exhaust line (2), a circuit (31, 32) for recirculating the exhaust gas, characterized in that it comprises a driving element (4). flexible exhaust system consisting of two coaxial flexible tubes (41; 42), defining respectively a passage (46) for the engine exhaust gases towards the exhaust line and a passage (45) for the recirculated gases of the line exhaust to the engine. 5. Ensemble de motorisation selon la revendication 4, caractérisé en ce que les gaz d'échappement du moteur vers la ligne d'échappement passent dans le tube central (41) et les gaz recirculés passent dans l'espace annulaire (45) entre les deux tubes. Motor assembly according to Claim 4, characterized in that the exhaust gases from the engine to the exhaust line pass into the central tube (41) and the recirculated gases pass into the annular space (45) between them. two tubes. 6. Ensemble de motorisation selon la revendication 4, caractérisé en ce que les tubes flexibles coaxiaux comportent un tube intérieur (41) et un tube extérieur (42), maintenus en position relative par des brides d'extrémité (43) comportant des lumières de passage (44). 6. Motorization assembly according to claim 4, characterized in that the coaxial flexible tubes comprise an inner tube (41) and an outer tube (42), maintained in relative position by end flanges (43) having passage (44). 7. Ensemble de motorisation selon la revendication 4, caractérisé en ce que les tubes flexibles coaxiaux 10 (41 ; 42) sont métalliques. 7. Motorization assembly according to claim 4, characterized in that the coaxial flexible tubes (41; 42) are metallic.
FR0850449A 2008-01-24 2008-01-24 Flexible exhaust pipe element for motor vehicle, has flexible inner and outer tubes maintained in relative position by end flanges, where inner tube defines central passage, and annular channel formed between inner and outer tubes Pending FR2926845A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR0850449A FR2926845A1 (en) 2008-01-24 2008-01-24 Flexible exhaust pipe element for motor vehicle, has flexible inner and outer tubes maintained in relative position by end flanges, where inner tube defines central passage, and annular channel formed between inner and outer tubes

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Application Number Priority Date Filing Date Title
FR0850449A FR2926845A1 (en) 2008-01-24 2008-01-24 Flexible exhaust pipe element for motor vehicle, has flexible inner and outer tubes maintained in relative position by end flanges, where inner tube defines central passage, and annular channel formed between inner and outer tubes

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FR2926845A1 true FR2926845A1 (en) 2009-07-31

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FR0850449A Pending FR2926845A1 (en) 2008-01-24 2008-01-24 Flexible exhaust pipe element for motor vehicle, has flexible inner and outer tubes maintained in relative position by end flanges, where inner tube defines central passage, and annular channel formed between inner and outer tubes

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014055009A1 (en) * 2012-10-03 2014-04-10 Scania Cv Ab Exhaust gas aftertreatment system and motor vehicles comprising such an aftertreatment system
DE102013109338A1 (en) * 2013-08-28 2015-03-05 Witzenmann Gmbh Decoupling element for an exhaust system
DE102013111313A1 (en) * 2013-10-14 2015-04-16 Witzenmann Gmbh Conduit for an exhaust system with exhaust gas recirculation
DE102013111033B4 (en) 2012-10-08 2019-10-17 Witzenmann Gmbh Method and device for thermal management of a vehicle exhaust system

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Publication number Priority date Publication date Assignee Title
US5609144A (en) * 1996-01-16 1997-03-11 Ford Motor Company Articulated exhaust gas recirculation supply tube for automotive engine
US20030006301A1 (en) * 2001-06-18 2003-01-09 Calsonic Kansei Corporation Double pipe exhaust manifold
EP1331388A2 (en) * 2002-01-28 2003-07-30 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Exhaust gas recirculation device for engines
WO2003067044A1 (en) * 2001-12-06 2003-08-14 Stt Emtec Ab A device for exhaust gas purification
EP1770250A2 (en) * 2005-09-28 2007-04-04 Witzenmann GmbH Heat exchanger for exhaust pipes
FR2908831A1 (en) * 2006-11-22 2008-05-23 Renault Sas ARRANGEMENT FOR THE ASSEMBLY OF AN EXHAUST GAS DERIVATION DRIVE HAVING AN UPPER END FRONT PORTION BY A DEPOLLUTION DEVICE

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5609144A (en) * 1996-01-16 1997-03-11 Ford Motor Company Articulated exhaust gas recirculation supply tube for automotive engine
US20030006301A1 (en) * 2001-06-18 2003-01-09 Calsonic Kansei Corporation Double pipe exhaust manifold
WO2003067044A1 (en) * 2001-12-06 2003-08-14 Stt Emtec Ab A device for exhaust gas purification
EP1331388A2 (en) * 2002-01-28 2003-07-30 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Exhaust gas recirculation device for engines
EP1770250A2 (en) * 2005-09-28 2007-04-04 Witzenmann GmbH Heat exchanger for exhaust pipes
FR2908831A1 (en) * 2006-11-22 2008-05-23 Renault Sas ARRANGEMENT FOR THE ASSEMBLY OF AN EXHAUST GAS DERIVATION DRIVE HAVING AN UPPER END FRONT PORTION BY A DEPOLLUTION DEVICE

Cited By (4)

* Cited by examiner, † Cited by third party
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