EP0806554A1 - Exhaust system for internal combustion engines - Google Patents

Exhaust system for internal combustion engines Download PDF

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Publication number
EP0806554A1
EP0806554A1 EP97400994A EP97400994A EP0806554A1 EP 0806554 A1 EP0806554 A1 EP 0806554A1 EP 97400994 A EP97400994 A EP 97400994A EP 97400994 A EP97400994 A EP 97400994A EP 0806554 A1 EP0806554 A1 EP 0806554A1
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EP
European Patent Office
Prior art keywords
monolithic element
internal combustion
exhaust
catalytic converter
combustion engine
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.)
Withdrawn
Application number
EP97400994A
Other languages
German (de)
French (fr)
Inventor
Bernard Dechereux
Patrick Gastaldi
Thierry Fillion
Christophe Gondion
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
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 Renault SAS filed Critical Renault SAS
Publication of EP0806554A1 publication Critical patent/EP0806554A1/en
Withdrawn legal-status Critical Current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
    • F01N13/08—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
    • 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
    • F01N13/009—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 having two or more separate purifying devices arranged in series
    • 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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • 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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
    • 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
    • F01N2470/18—Structure or shape of gas passages, pipes or tubes the axis of inlet or outlet tubes being other than the longitudinal axis of apparatus

Definitions

  • the present invention relates to an exhaust device for a multi-cylinder internal combustion engine intended in particular to equip a motor vehicle, and more particularly to an exhaust device suitable for homogenizing the flow of burnt gases through a catalytic converter when this is arranged downstream of an elbow.
  • the exhaust gas exhaust device of a multi-cylinder internal combustion engine comprises an exhaust manifold fixed to the cylinder head of the engine and an exhaust line formed by tubes, a catalytic converter, trigger, muffler, etc. which extends to the outlet to the open air.
  • one solution disclosed by document FR-A1-2,703,297, consists in using a monolithic element with a curved honeycomb structure. This solution is however complex to carry out and therefore expensive to manufacture.
  • the present invention therefore aims to remedy these various drawbacks with an exhaust device for an internal combustion engine allowing a homogeneous distribution of the exhaust gases inside a catalytic converter located near and at the outlet of '' an elbow that is simple and economical to make.
  • the exhaust device for a multicylinder internal combustion engine comprises an exhaust manifold which is fixed to the cylinder head of the engine and an exhaust line provided with a catalytic converter of the type comprising inlet ends and outlet, and an oblong body in which is housed a first monolithic element comprising multiple channels arranged longitudinally and coated with catalytic substances, the exhaust line being shaped so that the path of the burnt gases forms a bend before entering the catalytic converter.
  • the exhaust device for an internal combustion engine is characterized in that flow rectifier means are arranged at the elbow, the flow rectifier means being formed by a second monolithic element, the channels of which are arranged in the axis of the first monolithic element.
  • the inlet end of the burnt gases in the second monolithic element is truncated.
  • the longitudinal channels of the second monolithic element are coated with an active catalytic substance such as a priming catalyst.
  • the inlet end of the second monolithic element forms an angle between 15 ° and 30 ° with the plane normal to the longitudinal axis of the second monolithic element.
  • the elbow extends to the level of the connection of a turbocharger with the catalytic converter.
  • the elbow extends at the connection of the exhaust manifold with the exhaust line.
  • the catalytic converter is connected directly to the exhaust manifold, the second monolithic element being inserted partly in the inlet of the catalytic converter and partly in the exhaust manifold.
  • the exhaust manifold consists of a single oblong capacity of triangular shape and suitable volume, the part of the cavity coming from the front with the engine cylinder head forming the base of the triangle, the opposite vertex of the triangular cavity having a single outlet opening intended to be connected directly to the catalytic converter, the catalytic converter then being arranged perpendicular to the exhaust manifold.
  • the outlet end of the burnt gases from the second monolithic element is truncated parallel to its inlet end and / or the inlet and outlet ends of the first monolithic element are truncated parallel to the outlet end of the second monolithic element.
  • the first monolithic element and the second monolithic element are one.
  • FIGS. 1a and 1b show a first embodiment of the exhaust device according to the invention
  • the exhaust manifold 101 consists of a single oblong capacity, of triangular shape in the plane of the cylinder head 104, this capacity having a single outlet opening, in its lower part, intended to be connected directly to a catalytic converter 102. Connecting the catalytic converter 102 to the manifold exhaust 101 is carried out perpendicularly, thereby obtaining a compact assembly in the engine compartment. The connection of the catalytic converter 102 with the exhaust pipe 101 forms an elbow 107 causing a change of direction of 90 ° in the burnt gases.
  • the catalytic converter 102 is also connected to an exhaust line 103 comprising conventional elements such as an expansion pot and a silencer not shown in the figures.
  • the catalytic converter 102 comprises a first monolithic element 105 consisting of a regular network of channels parallel to each other and arranged in the longitudinal axis of the catalytic converter 102. These channels are coated with a active catalytic substance, for example based on precious metals and metal oxide, allowing the treatment of polluting substances contained in the burnt gases.
  • a second monolithic element 106 is arranged at the level of the elbow 107 formed by the connection of the manifold 101 with the catalytic converter 102.
  • the second monolithic element 106 comprises, similarly to the first monolithic element 105, multiple channels oriented in the axis of the first monolithic element 105 so as to bring the gas flow in the direction thereof, these channels being able to be coated of substances active catalysts for the treatment of burnt gases.
  • the inlet end 108 of the burnt gases of the second monolithic element 106 is truncated so as to have an inlet face inclined in the direction of the flow of the burnt gases.
  • the inclination of this inlet end 108 is, in the example, between 15 ° and 30 ° and depends on several parameters including the diameter of the monolithic element 106 and the characteristics of the cavity forming the exhaust manifold 101.
  • This inclination of the inlet end 108 makes it possible to increase the passage section, in the direction of the burnt gases, of the channels of the second monolithic element 106 and thus to obtain better filling of the latter.
  • the length of the second monolithic element 106 is adapted so that the outlet face of the latter is situated approximately at the level of the inlet of the diverging portion of the catalytic converter 102.
  • the substantially homogeneous distribution of the gases in the channels of the monolithic element 106 then allows the homogeneous diffusion of the burnt gases at the inlet of the diverging part of the catalytic converter 102 and therefore a homogeneous distribution of the gases in the channels of the first monolithic element 105. This arrangement allows thus optimizing the efficiency of the catalytic converter 102.
  • the installation of the monolithic element 106 in the elbow 107 therefore makes it possible to reduce strongly uneven distribution of the burnt gases in the catalytic converter 102, linked to the presence of the elbow 107, and thus reduce the risks of premature aging of the catalytic converter 102.
  • FIG. 2 shows a second embodiment of the exhaust device according to the invention, for an internal combustion engine comprising a turbocharger 212 interposed between an exhaust manifold, not shown in the figure, and a catalytic converter 202 similar to that of the device of FIG. 1b, arranged perpendicular to the axis of the turbocharger 212 so as to keep a compact assembly.
  • the elbow 207 formed by the connection of the outlet of the turbine of the turbocharger 212 with the inlet of the catalytic converter 202 comprises a second monolithic element 206 whose function and advantages are identical to those described for the device in FIG. 1b.
  • the immediate proximity of the catalytic converter 202 with the turbocharger 212 then makes it possible to maintain a temperature of the burnt gases sufficient for the correct operation of the catalytic converter 202.
  • Figure 3 shows a third embodiment of the exhaust device according to the invention.
  • the first monolithic element 305 of the catalytic converter 302 and the second monolithic element 306 located in the elbow 307 differ from the elements described for the first embodiment of the exhaust device according to the invention of Figure 1b.
  • the inlet 310 and outlet 311 ends of the first monolithic element 305 as well as the outlet end 309 of the second monolithic element 306 are truncated parallel to the inlet end 308 of the second monolithic element 306, the inclination is chosen according to criteria similar to those described for the first embodiment of the exhaust device of Figure 1b.
  • the divergent cone of the catalytic converter 302 is adapted so that its entry surface coincides with the exit end 309 of the second monolithic element 306 and that its exit surface coincides with the entry end 310 of the first element monolithic 305.
  • the inclination of the inlet end 308 of the second monolithic element 306 makes it possible, as for the first embodiment of FIG. 1b, to homogenize the flow of the burnt gases in the channels of the second monolithic element 306 and therefore to homogenize the diffusion of the burnt gases at the input of the first monolithic element 305.
  • the inclination of the ends of the first and second monolithic element 305 and 306 parallel to the inlet end 308 makes it possible to maintain an identical length of all the channels of the monolithic elements.
  • the coefficient of pressure losses of a channel being linked to its length, the equality of the length of the channels makes it possible to obtain identical pressure drop coefficients in each channel, which is favorable for a homogeneous distribution of the gases burned in the first and second monolithic element 305 and 306.
  • the inclination of the outlet end 311 of the first monolithic element 305 in the direction of the exhaust line 303 also makes it possible to make the connection of the catalytic converter 302 with the exhaust line 303 more compact by making a perpendicular connection of the exhaust line 303 on the catalytic converter 302 at the level of the space freed by the inclination of the outlet end 311.
  • a second monolithic element 306 according to the exhaust device according to the invention therefore makes it possible to straighten and homogenize the flow at the outlet of an elbow and to participate in the purification of the burnt gases thanks to the catalytic substances it contains.
  • the third embodiment of FIG. 3 therefore presents an optimization of the exhaust device presented in FIG. 1b.
  • Figure 4 shows a fourth embodiment of the exhaust device according to the invention.
  • only the second monolithic element 406 located in the elbow differs from the elements described for the first embodiment of the exhaust device of FIG. 1b.
  • the monolithic element 406 used in this embodiment is a conventional monolith whose inlet faces 408 and outlet 409 are perpendicular to the axis of the monolith.
  • This monolithic element 406 has the particularity of having an inlet face 408 disposed at the outlet opening of the collector 401 and in the extension of the lower face of the latter.
  • the second monolithic element 406 has a length adapted so that the outlet face 409 of the latter is disposed approximately at the level of the inlet of the diverging portion of the catalytic converter 402 so as to optimize the diffusion of the exhaust gases at the outlet from the second monolithic 406.
  • This embodiment while remaining less effective than the embodiments presented in FIGS. 1b to 3, makes it possible to clearly improve the diffusion of the burnt gases downstream of the first monolithic element 405 of the catalytic converter 402 compared to the diffusion obtained when the second monolithic element 406 is not present.
  • This embodiment has the advantage of being industrializable with very low cost and of providing a marked improvement in the diffusion of the burnt gases through the catalytic converter and in improving the purification of the burnt gases.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Silencers (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

The exhaust consists of a manifold (301) connected to the engine cylinder head (304), and an exhaust pipe (303) with a catalytic chamber (302) having an intake and an outlet and containing a block (305) with multiple lengthwise channels coated with catalytic substances. The gases have to pass round a bend (307) before entering the converter. The system has an exhaust gas flow rectifier (306) situated at the level of the bend between the manifold and converter and made in the form of a second multi-channel block with its channels lying coaxially with those of the first block. The intake end (308) of the second block is truncated, and its channels are coated with an active catalytic product. The angle of the bend is close to 90 degrees, with the intake of the rectifier forming an angle of 15 - 30 degrees with a plane normal to its axis.

Description

La présente invention se rapporte à un dispositif d'échappement pour un moteur à combustion interne multicylindre destiné notamment à équiper un véhicule automobile, et plus particulièrement à un dispositif d'échappement adapté pour homogénéiser l'écoulement des gaz brûlés à travers un pot catalytique lorsque celui-ci est disposé en aval d'un coude.The present invention relates to an exhaust device for a multi-cylinder internal combustion engine intended in particular to equip a motor vehicle, and more particularly to an exhaust device suitable for homogenizing the flow of burnt gases through a catalytic converter when this is arranged downstream of an elbow.

Classiquement, le dispositif d'échappement des gaz de combustion d'un moteur à combustion interne multicylindre comprend un collecteur d'échappement fixé à la culasse du moteur et une ligne d'échappement formée de tubes, d'un pot catalytique, de pots de détente, de silencieux, etc.. qui s'étend jusqu'à la bouche de sortie à l'air libre.Conventionally, the exhaust gas exhaust device of a multi-cylinder internal combustion engine comprises an exhaust manifold fixed to the cylinder head of the engine and an exhaust line formed by tubes, a catalytic converter, trigger, muffler, etc. which extends to the outlet to the open air.

Il est connu pour réduire le temps d'amorçage du pot catalytique de rapprocher ce dernier du collecteur d'échappement de façon à limiter les pertes thermiques et à conserver une température élevée aux gaz de combustion entrant dans le pot catalytique.It is known to reduce the priming time of the catalytic converter to bring the latter closer to the exhaust manifold so as to limit the heat losses and to maintain a high temperature for the combustion gases entering the catalytic converter.

Cette disposition ainsi que les contraintes d'implantation dans le compartiment moteur du véhicule implique, le plus souvent, la présence d'un coude dans le circuit des gaz brûlés, à l'entrée du pot catalytique. Le coude en amont du pot catalytique perturbe alors l'écoulement des gaz brûlés en entrée du pot catalytique, ce qui entraîne une mauvaise répartition des gaz à travers la section d'entrée de l'élément monolithique du pot catalytique pouvant occasionner un vieillissement prématuré de celui-ci.This arrangement, as well as the installation constraints in the engine compartment of the vehicle, most often implies the presence of an elbow in the burnt gas circuit, the entry of the catalytic converter. The bend upstream of the catalytic converter then disturbs the flow of the burnt gases entering the catalytic converter, which leads to a poor distribution of the gases through the entry section of the monolithic element of the catalytic converter which can cause premature aging of this one.

Pour améliorer la répartition des gaz brûlés dans un pot catalytique situé au niveau d'un coude, une solution, divulguée par le document FR-A1-2.703.297, consiste à utiliser un élément monolithique à structure en nid d'abeille courbe. Cette solution est toutefois complexe à réaliser et donc chère à fabriquer.To improve the distribution of the burnt gases in a catalytic converter located at an elbow, one solution, disclosed by document FR-A1-2,703,297, consists in using a monolithic element with a curved honeycomb structure. This solution is however complex to carry out and therefore expensive to manufacture.

La présente invention a donc pour but de remédier à ces divers inconvénients grâce à un dispositif d'échappement pour moteur à combustion interne permettant une répartition homogène des gaz d'échappement à l'intérieur d'un pot catalytique situé à proximité et en sortie d'un coude et qui soit simple et économique à réaliser.The present invention therefore aims to remedy these various drawbacks with an exhaust device for an internal combustion engine allowing a homogeneous distribution of the exhaust gases inside a catalytic converter located near and at the outlet of '' an elbow that is simple and economical to make.

Le dispositif d'échappement pour moteur à combustion interne multicylindre selon l'invention comprend un collecteur d'échappement venant se fixer à la culasse du moteur et une ligne d'échappement munie d'un pot catalytique du type comportant des extrémités d'entrée et de sortie, et un corps oblong dans lequel est logé un premier élément monolithique comportant de multiples canaux disposés longitudinalement et revêtu de substances catalytiques, la ligne d'échappement étant conformée de sorte que le trajet des gaz brûlés forme un coude avant l'entrée dans le pot catalytique.The exhaust device for a multicylinder internal combustion engine according to the invention comprises an exhaust manifold which is fixed to the cylinder head of the engine and an exhaust line provided with a catalytic converter of the type comprising inlet ends and outlet, and an oblong body in which is housed a first monolithic element comprising multiple channels arranged longitudinally and coated with catalytic substances, the exhaust line being shaped so that the path of the burnt gases forms a bend before entering the catalytic converter.

Selon l'invention, le dispositif d'échappement pour moteur à combustion interne est caractérisé en ce que des moyens redresseur de flux sont disposés au niveau du coude, les moyens redresseur de flux étant formés par un second élément monolithique dont les canaux sont disposés dans l'axe du premier élément monolithique.According to the invention, the exhaust device for an internal combustion engine is characterized in that flow rectifier means are arranged at the elbow, the flow rectifier means being formed by a second monolithic element, the channels of which are arranged in the axis of the first monolithic element.

Selon une autre caractéristique du dispositif d'échappement pour moteur à combustion interne objet de l'invention, l'extrémité d'entrée des gaz brûlés dans le second élément monolithique est tronquée.According to another characteristic of the exhaust device for internal combustion engine object of the invention, the inlet end of the burnt gases in the second monolithic element is truncated.

Selon une autre caractéristique du dispositif d'échappement pour moteur à combustion interne objet de l'invention, les canaux longitudinaux du second élément monolithique sont revêtus d'une substance catalytique active tel qu'un catalyseur d'amorçage.According to another characteristic of the exhaust device for an internal combustion engine object of the invention, the longitudinal channels of the second monolithic element are coated with an active catalytic substance such as a priming catalyst.

Selon une autre caractéristique du dispositif d'échappement pour moteur à combustion interne objet de l'invention, lorsque l'angle du coude est proche de 90°, l'extrémité d'entrée du second élément monolithique forme un angle compris entre 15° et 30° avec le plan normal à l'axe longitudinal du second élément monolithique.According to another characteristic of the exhaust device for internal combustion engine object of the invention, when the angle of the elbow is close to 90 °, the inlet end of the second monolithic element forms an angle between 15 ° and 30 ° with the plane normal to the longitudinal axis of the second monolithic element.

Selon une autre caractéristique du dispositif d'échappement pour moteur à combustion interne objet de l'invention, le coude s'étend au niveau de la connexion d'un turbocompresseur avec le pot catalytique.According to another characteristic of the exhaust device for internal combustion engine object of the invention, the elbow extends to the level of the connection of a turbocharger with the catalytic converter.

Selon encore une autre caractéristique du dispositif d'échappement pour moteur à combustion interne objet de l'invention, le coude s'étend au niveau de la connexion du collecteur d'échappement avec la ligne d'échappement.According to yet another characteristic of the exhaust device for internal combustion engine object of the invention, the elbow extends at the connection of the exhaust manifold with the exhaust line.

Selon une autre caractéristique du dispositif d'échappement pour moteur à combustion interne objet de l'invention, le pot catalytique est relié directement au collecteur d'échappement, le second élément monolithique étant inséré pour partie dans l'entrée du pot catalytique et pour partie dans le collecteur d'échappement.According to another characteristic of the exhaust device for an internal combustion engine object of the invention, the catalytic converter is connected directly to the exhaust manifold, the second monolithic element being inserted partly in the inlet of the catalytic converter and partly in the exhaust manifold.

Selon une autre caractéristique du dispositif d'échappement pour moteur à combustion interne objet de l'invention, le collecteur d'échappement est constitué par une unique capacité oblongue de forme triangulaire et de volume adapté, la partie de la cavité venant de face avec la culasse du moteur formant la base du triangle, le sommet opposé de la cavité triangulaire comportant une unique ouverture de sortie destinée à être raccordée directement au pot catalytique, le pot catalytique étant alors disposé perpendiculairement au collecteur d'échappement.According to another characteristic of the exhaust device for internal combustion engine object of the invention, the exhaust manifold consists of a single oblong capacity of triangular shape and suitable volume, the part of the cavity coming from the front with the engine cylinder head forming the base of the triangle, the opposite vertex of the triangular cavity having a single outlet opening intended to be connected directly to the catalytic converter, the catalytic converter then being arranged perpendicular to the exhaust manifold.

Selon une autre caractéristique du dispositif d'échappement pour moteur à combustion interne objet de l'invention, l'extrémité de sortie des gaz brûlés du second élément monolithique est tronquée parallèlement à son extrémité d'entrée et/ou les extrémités d'entrée et de sortie du premier élément monolithique sont tronquées parallèlement à l'extrémité de sortie du second élément monolithique.According to another characteristic of the exhaust device for an internal combustion engine which is the subject of the invention, the outlet end of the burnt gases from the second monolithic element is truncated parallel to its inlet end and / or the inlet and outlet ends of the first monolithic element are truncated parallel to the outlet end of the second monolithic element.

Selon une autre caractéristique du dispositif d'échappement pour moteur à combustion interne objet de l'invention, le premier élément monolithique et le second élément monolithique ne font qu'un.According to another characteristic of the exhaust device for internal combustion engine object of the invention, the first monolithic element and the second monolithic element are one.

On comprendra mieux les buts, aspects et avantages de la présente invention, d'après la description donnée ci-après de différents modes de réalisation de l'invention, présentés à titre d'exemples non limitatifs, en se référant aux dessins annexés, dans lesquels :

  • la figure la est une vue en perspective d'un premier mode de réalisation du dispositif d'échappement selon l'invention ;
  • la figure 1b est une vue en coupe du premier mode de réalisation du dispositif d'échappement selon l'invention, suivant la ligne B-B de la figure 1a ;
  • la figure 2 est une vue similaire à la figure 1b montrant un second mode de réalisation du dispositif d'échappement selon l'invention ;
  • la figure 3 est une vue similaire à la figure 1b montrant un troisième mode de réalisation du dispositif d'échappement selon l'invention.
  • la figure 4 est une vue similaire à la figure 1b montrant un quatrième mode de réalisation du dispositif d'échappement selon l'invention.
The objects, aspects and advantages of the present invention will be better understood from the description given below of various embodiments of the invention, presented by way of non-limiting examples, with reference to the accompanying drawings, in which :
  • Figure la is a perspective view of a first embodiment of the exhaust device according to the invention;
  • Figure 1b is a sectional view of the first embodiment of the exhaust device according to the invention, along the line BB of Figure 1a;
  • Figure 2 is a view similar to Figure 1b showing a second embodiment of the exhaust device according to the invention;
  • Figure 3 is a view similar to Figure 1b showing a third embodiment of the exhaust device according to the invention.
  • Figure 4 is a view similar to Figure 1b showing a fourth embodiment of the exhaust device according to the invention.

Les pièces de fonction équivalente mais de réalisation différente ont été numérotées avec les mêmes chiffres des dizaines et des unités mais précédées du chiffre correspondant au numéro de la figure. Pour faciliter la lecture des dessins, les pièces qui demeurent identiques d'un mode de réalisation à l'autre sont repérées suivant le système de numérotation précité, ainsi la culasse est successivement désigné 104, 204, 304 et 404. Par ailleurs, seuls les éléments nécessaires à la compréhension de l'invention ont été figurés.Parts of equivalent function but of different construction have been numbered with the same tens and units digits but preceded by the number corresponding to the number in the figure. To facilitate reading of the drawings, the parts which remain identical from one embodiment to the other are identified according to the aforementioned numbering system, thus the cylinder head is successively designated 104, 204, 304 and 404. Furthermore, only the elements necessary for understanding the invention have been figured.

En se reportant aux figures 1a et 1b qui présentent un premier mode de réalisation du dispositif d'échappement selon l'invention, on voit une partie de la culasse 104 d'un moteur à combustion interne de type à quatre cylindres en ligne sur laquelle est fixé un collecteur d'échappement 101 présentant une paroi latérale servant de bride de fixation à travers laquelle sont ménagés des orifices de passage destinés à être positionnés en regard des orifices de sorties des conduits d'échappement de la culasse 104.Referring to Figures 1a and 1b which show a first embodiment of the exhaust device according to the invention, there is seen a portion of the cylinder head 104 of an internal combustion engine of the type with four cylinders in line on which is fixed an exhaust manifold 101 having a side wall serving as a fixing flange through which are formed passage orifices intended to be positioned opposite the outlet orifices of the exhaust ducts of the cylinder head 104.

Le collecteur d'échappement 101 est constitué par une unique capacité oblongue, de forme triangulaire dans le plan de la culasse 104, cette capacité possédant une unique ouverture de sortie, dans sa partie inférieure, destinée à être raccordée directement à un pot catalytique 102. Le raccordement du pot catalytique 102 au collecteur d'échappement 101 s'effectue perpendiculairement, permettant ainsi d'obtenir un ensemble compact dans le compartiment moteur. La liaison du pot catalytique 102 avec le pot d'échappement 101 forme un coude 107 entraînant un changement de direction de 90° des gaz brûlés.The exhaust manifold 101 consists of a single oblong capacity, of triangular shape in the plane of the cylinder head 104, this capacity having a single outlet opening, in its lower part, intended to be connected directly to a catalytic converter 102. Connecting the catalytic converter 102 to the manifold exhaust 101 is carried out perpendicularly, thereby obtaining a compact assembly in the engine compartment. The connection of the catalytic converter 102 with the exhaust pipe 101 forms an elbow 107 causing a change of direction of 90 ° in the burnt gases.

Le pot catalytique 102 est par ailleurs connecté à une ligne d'échappement 103 comportant des éléments classiques tels qu'un pot de détente et un silencieux non représentés sur les figures.The catalytic converter 102 is also connected to an exhaust line 103 comprising conventional elements such as an expansion pot and a silencer not shown in the figures.

Conformément aux figures 1a et 1b, on voit que le pot catalytique 102 comporte un premier élément monolithique 105 constitué d'un réseau régulier de canaux parallèles entre eux et disposés dans l'axe longitudinal du pot catalytique 102. Ces canaux sont revêtus d'une substance catalytique active, par exemple à base de métaux précieux et d'oxyde métalliques, permettant le traitement des substances polluantes contenues dans les gaz brûlés.In accordance with FIGS. 1a and 1b, it can be seen that the catalytic converter 102 comprises a first monolithic element 105 consisting of a regular network of channels parallel to each other and arranged in the longitudinal axis of the catalytic converter 102. These channels are coated with a active catalytic substance, for example based on precious metals and metal oxide, allowing the treatment of polluting substances contained in the burnt gases.

En se reportant à la figure 1b, on voit qu'un second élément monolithique 106 est disposé au niveau du coude 107 formé par la connexion du collecteur 101 avec le pot catalytique 102.Referring to FIG. 1b, it can be seen that a second monolithic element 106 is arranged at the level of the elbow 107 formed by the connection of the manifold 101 with the catalytic converter 102.

Le second élément monolithique 106 comporte, de façon similaire au premier élément monolithique 105, de multiples canaux orientés dans l'axe du premier élément monolithique 105 de façon à amener le flux de gaz dans la direction de celui-ci, ces canaux pouvant être revêtus de substances catalytiques actives permettant le traitement des gaz brûlés.The second monolithic element 106 comprises, similarly to the first monolithic element 105, multiple channels oriented in the axis of the first monolithic element 105 so as to bring the gas flow in the direction thereof, these channels being able to be coated of substances active catalysts for the treatment of burnt gases.

L'extrémité d'entrée 108 des gaz brûlés du second élément monolithique 106 est tronquée de manière à présenter une face d'entrée inclinée en direction du flux des gaz brûlés. L'inclinaison de cette extrémité d'entrée 108 est, dans l'exemple, comprise entre 15° et 30° et dépend de plusieurs paramètres dont le diamètre de l'élément monolithique 106 et des caractéristiques de la cavité formant le collecteur d'échappement 101.The inlet end 108 of the burnt gases of the second monolithic element 106 is truncated so as to have an inlet face inclined in the direction of the flow of the burnt gases. The inclination of this inlet end 108 is, in the example, between 15 ° and 30 ° and depends on several parameters including the diameter of the monolithic element 106 and the characteristics of the cavity forming the exhaust manifold 101.

Cette inclinaison de l'extrémité d'entrée 108 permet d'augmenter la section de passage, en direction des gaz brûlés, des canaux du second élément monolithique 106 et ainsi d'obtenir un meilleur remplissage de ces derniers.This inclination of the inlet end 108 makes it possible to increase the passage section, in the direction of the burnt gases, of the channels of the second monolithic element 106 and thus to obtain better filling of the latter.

La longueur du second élément monolithique 106 est adaptée de façon à ce que la face de sortie de ce dernier soit située approximativement au niveau de l'entrée du divergent du pot catalytique 102.The length of the second monolithic element 106 is adapted so that the outlet face of the latter is situated approximately at the level of the inlet of the diverging portion of the catalytic converter 102.

La répartition sensiblement homogène des gaz dans les canaux de l'élément monolithique 106 permet alors la diffusion homogène des gaz brûlés en entrée du divergent du pot catalytique 102 et donc une répartition homogène des gaz dans les canaux du premier élément monolithique 105. Cette disposition permet ainsi d'optimiser l'efficacité du pot catalytique 102.The substantially homogeneous distribution of the gases in the channels of the monolithic element 106 then allows the homogeneous diffusion of the burnt gases at the inlet of the diverging part of the catalytic converter 102 and therefore a homogeneous distribution of the gases in the channels of the first monolithic element 105. This arrangement allows thus optimizing the efficiency of the catalytic converter 102.

La mise en place de l'élément monolithique 106 dans le coude 107 permet donc de réduire fortement les inégalités de répartition des gaz brûlés dans le pot catalytique 102, liées à la présence du coude 107, et ainsi de réduire les risques de vieillissement prématuré du pot catalytique 102.The installation of the monolithic element 106 in the elbow 107 therefore makes it possible to reduce strongly uneven distribution of the burnt gases in the catalytic converter 102, linked to the presence of the elbow 107, and thus reduce the risks of premature aging of the catalytic converter 102.

La figure 2 présente un second mode de réalisation du dispositif d'échappement selon l'invention, pour un moteur à combustion interne comportant un turbocompresseur 212 intercalé entre un collecteur d'échappement, non figuré sur la figure, et un pot catalytique 202 semblable à celui du dispositif de la figure 1b, disposé perpendiculairement à l'axe du turbocompresseur 212 de manière à conserver un ensemble compact.FIG. 2 shows a second embodiment of the exhaust device according to the invention, for an internal combustion engine comprising a turbocharger 212 interposed between an exhaust manifold, not shown in the figure, and a catalytic converter 202 similar to that of the device of FIG. 1b, arranged perpendicular to the axis of the turbocharger 212 so as to keep a compact assembly.

Le coude 207 formé par la connexion de la sortie de la turbine du turbocompresseur 212 avec l'entrée du pot catalytique 202 comporte un second élément monolithique 206 dont la fonction et les avantages sont identiques à ceux décrits pour le dispositif de la figure 1b.The elbow 207 formed by the connection of the outlet of the turbine of the turbocharger 212 with the inlet of the catalytic converter 202 comprises a second monolithic element 206 whose function and advantages are identical to those described for the device in FIG. 1b.

La proximité immédiate du pot catalytique 202 avec le turbocompresseur 212 permet alors de conserver une température des gaz brûlés suffisante pour le fonctionnement correct du pot catalytique 202.The immediate proximity of the catalytic converter 202 with the turbocharger 212 then makes it possible to maintain a temperature of the burnt gases sufficient for the correct operation of the catalytic converter 202.

La figure 3 présente un troisième mode de réalisation du dispositif d'échappement selon l'invention. Sur cette figure, le premier élément monolithique 305 du pot catalytique 302 et le second élément monolithique 306 situé dans le coude 307 diffèrent des éléments décrits pour le premier mode de réalisation du dispositif d'échappement selon l'invention de la figure 1b.Figure 3 shows a third embodiment of the exhaust device according to the invention. In this figure, the first monolithic element 305 of the catalytic converter 302 and the second monolithic element 306 located in the elbow 307 differ from the elements described for the first embodiment of the exhaust device according to the invention of Figure 1b.

En effet, les extrémités d'entrée 310 et de sortie 311 du premier élément monolithique 305 ainsi que l'extrémité de sortie 309 du second élément monolithique 306 sont tronquées parallèlement à l'extrémité d'entrée 308 du second élément monolithique 306 dont l'inclinaison est choisie selon des critères semblables à ceux décrits pour le premier mode de réalisation du dispositif d'échappement de la figure 1b. Le cône divergent du pot catalytique 302 est adapté de façon à ce que sa surface d'entrée coïncide avec l'extrémité de sortie 309 du second élément monolithique 306 et que sa surface de sortie coïncide avec l'extrémité d'entrée 310 du premier élément monolithique 305.Indeed, the inlet 310 and outlet 311 ends of the first monolithic element 305 as well as the outlet end 309 of the second monolithic element 306 are truncated parallel to the inlet end 308 of the second monolithic element 306, the inclination is chosen according to criteria similar to those described for the first embodiment of the exhaust device of Figure 1b. The divergent cone of the catalytic converter 302 is adapted so that its entry surface coincides with the exit end 309 of the second monolithic element 306 and that its exit surface coincides with the entry end 310 of the first element monolithic 305.

L'inclinaison de l'extrémité d'entrée 308 du second élément monolithique 306 permet, tout comme pour le premier mode de réalisation de la figure 1b, d'homogénéiser l'écoulement des gaz brûlés dans les canaux du second élément monolithique 306 et donc d'homogénéiser la diffusion des gaz brûlés en entrée du premier élément monolithique 305.The inclination of the inlet end 308 of the second monolithic element 306 makes it possible, as for the first embodiment of FIG. 1b, to homogenize the flow of the burnt gases in the channels of the second monolithic element 306 and therefore to homogenize the diffusion of the burnt gases at the input of the first monolithic element 305.

Par ailleurs, l'inclinaison des extrémités des premier et second élément monolithique 305 et 306 parallèlement à l'extrémité d'entrée 308 permet de conserver une longueur identique de tous les canaux des éléments monolithiques. Le coefficient de pertes de charge d'un canal étant lié à sa longueur, l'égalité de la longueur des canaux permet d'obtenir des coefficients de pertes de charge identiques dans chaque canal ce qui est favorable à une répartition homogène des gaz brûlés dans les premier et second élément monolithique 305 et 306.Furthermore, the inclination of the ends of the first and second monolithic element 305 and 306 parallel to the inlet end 308 makes it possible to maintain an identical length of all the channels of the monolithic elements. The coefficient of pressure losses of a channel being linked to its length, the equality of the length of the channels makes it possible to obtain identical pressure drop coefficients in each channel, which is favorable for a homogeneous distribution of the gases burned in the first and second monolithic element 305 and 306.

L'inclinaison de l'extrémité de sortie 311 du premier élément monolithique 305 en direction de la ligne d'échappement 303 permet aussi de rendre plus compact la connexion du pot catalytique 302 avec la ligne d'échappement 303 en réalisant une connexion perpendiculaire de la ligne d'échappement 303 sur le pot catalytique 302 au niveau de l'espace libéré par l'inclinaison de l'extrémité de sortie 311.The inclination of the outlet end 311 of the first monolithic element 305 in the direction of the exhaust line 303 also makes it possible to make the connection of the catalytic converter 302 with the exhaust line 303 more compact by making a perpendicular connection of the exhaust line 303 on the catalytic converter 302 at the level of the space freed by the inclination of the outlet end 311.

La mise en place d'un second élément monolithique 306 suivant le dispositif d'échappement selon l'invention permet donc de redresser et d'homogénéiser le flux en sortie d'un coude et de participer à la purification des gaz brûlés grâce aux substances catalytiques qu'il contient.The installation of a second monolithic element 306 according to the exhaust device according to the invention therefore makes it possible to straighten and homogenize the flow at the outlet of an elbow and to participate in the purification of the burnt gases thanks to the catalytic substances it contains.

Le troisième mode de réalisation de la figure 3 présente donc une optimisation du dispositif d'échappement présenté sur la figure 1b.The third embodiment of FIG. 3 therefore presents an optimization of the exhaust device presented in FIG. 1b.

La figure 4 présente un quatrième mode de réalisation du dispositif d'échappement selon l'invention. Sur cette figure, seul le second élément monolithique 406 situé dans le coude diffère des éléments décrits pour le premier mode de réalisation du dispositif d'échappement de la figue 1b.Figure 4 shows a fourth embodiment of the exhaust device according to the invention. In this figure, only the second monolithic element 406 located in the elbow differs from the elements described for the first embodiment of the exhaust device of FIG. 1b.

L'élément monolithique 406 utilisé dans ce mode de réalisation est un monolithe classique dont les faces d'entrée 408 et de sortie 409 sont perpendiculaires à l'axe du monolithe. Cet élément monolithique 406 présente la particularité d'avoir une face d'entrée 408 disposée au niveau de l'ouverture de sortie du collecteur 401 et dans le prolongement de la face inférieure de ce dernier.The monolithic element 406 used in this embodiment is a conventional monolith whose inlet faces 408 and outlet 409 are perpendicular to the axis of the monolith. This monolithic element 406 has the particularity of having an inlet face 408 disposed at the outlet opening of the collector 401 and in the extension of the lower face of the latter.

Le second élément monolithique 406 possède une longueur adaptée de façon à ce que la face de sortie 409 de ce dernier soit disposée approximativement au niveau de l'entrée du divergent du pot catalytique 402 de façon à optimiser la diffusion des gaz d'échappement en sortie du second monolithique 406.The second monolithic element 406 has a length adapted so that the outlet face 409 of the latter is disposed approximately at the level of the inlet of the diverging portion of the catalytic converter 402 so as to optimize the diffusion of the exhaust gases at the outlet from the second monolithic 406.

Ce mode de réalisation, tout en restant moins efficace que les modes de réalisations présentés sur les figures 1b à 3, permet d'améliorer nettement la diffusion des gaz brûlés en aval du premier élément monolithique 405 du pot catalytique 402 par rapport à la diffusion obtenue lorsque le second élément monolithique 406 n'est pas présent.This embodiment, while remaining less effective than the embodiments presented in FIGS. 1b to 3, makes it possible to clearly improve the diffusion of the burnt gases downstream of the first monolithic element 405 of the catalytic converter 402 compared to the diffusion obtained when the second monolithic element 406 is not present.

Ce mode de réalisation présente l'avantage d'être industrialisable avec un très faible coût et d'apporter une nette amélioration de la diffusion des gaz brûlés à travers le pot catalytique et d'améliorer la purification des gaz brûlés.This embodiment has the advantage of being industrializable with very low cost and of providing a marked improvement in the diffusion of the burnt gases through the catalytic converter and in improving the purification of the burnt gases.

Bien entendu, l'invention n'est nullement limitée aux modes de réalisation décrits et illustrés qui n'ont été donnés qu'à titre d'exemple.Of course, the invention is in no way limited to the embodiments described and illustrated which have been given by way of example only.

Au contraire, l'invention comprend tous les équivalents techniques des moyens décrits ainsi que leurs combinaisons si celles-ci sont effectuées suivant son esprit.On the contrary, the invention includes all the technical equivalents of the means described and their combinations if these are carried out according to the spirit.

Claims (9)

Dispositif d'échappement pour moteur à combustion interne multicylindre comprenant un collecteur d'échappement (101;301;401) venant se fixer à la culasse (104;304;404) du moteur et une ligne d'échappement (103;203;303;403) munie d'un pot catalytique (102;202;302;402) du type comportant des extrémités d'entrée et de sortie, et un corps oblong dans lequel est logé un premier élément monolithique (105;205;305;405) comportant de multiples canaux disposés longitudinalement et revêtu de substances catalytiques, ladite ligne d'échappement (103;203;303;403) étant conformée de sorte que le trajet des gaz brûlés forme un coude (107;207;307;407) avant l'entrée dans le pot catalytique (102;202;302;402), caractérisé en ce que des moyens redresseur de flux (106;206;306;406) sont disposés au niveau du coude (107;207;307;407) formé par la connexion dudit collecteur d'échappement (101;301;401) avec ladite ligne d'échappement (103;303;403), lesdits moyens redresseur de flux étant formés par un second élément monolithique (106;206;306;406) dont les canaux sont disposés dans l'axe dudit premier élément monolithique (105;205;305;405).Exhaust device for a multicylinder internal combustion engine comprising an exhaust manifold (101; 301; 401) which is fixed to the cylinder head (104; 304; 404) of the engine and an exhaust line (103; 203; 303 ; 403) provided with a catalytic converter (102; 202; 302; 402) of the type comprising inlet and outlet ends, and an oblong body in which is housed a first monolithic element (105; 205; 305; 405 ) having multiple channels arranged longitudinally and coated with catalytic substances, said exhaust line (103; 203; 303; 403) being shaped so that the path of the burnt gases forms a bend (107; 207; 307; 407) before the inlet into the catalytic converter (102; 202; 302; 402), characterized in that flow rectifier means (106; 206; 306; 406) are arranged at the elbow (107; 207; 307; 407) formed by the connection of said exhaust manifold (101; 301; 401) with said exhaust line (103; 303; 403), said flow rectifier means nt formed by a second monolithic element (106; 206; 306; 406) whose channels are arranged in the axis of said first monolithic element (105; 205; 305; 405). Dispositif d'échappement pour moteur à combustion interne selon la revendication 1, caractérisé en ce que l'extrémité d'entrée (108;208;308) du second élément monolithique (106;206;306) est tronquée.Exhaust device for an internal combustion engine according to claim 1, characterized in that the inlet end (108; 208; 308) of the second monolithic element (106; 206; 306) is truncated. Dispositif d'échappement pour moteur à combustion interne selon l'une quelconque des revendications 1 à 2, caractérisé en ce que les canaux longitudinaux du second élément monolithique (106;206;306;406) sont revêtus d'une substance catalytique active tel qu'un catalyseur d'amorçage.Exhaust device for internal combustion engine according to any one of claims 1 to 2, characterized in that the longitudinal channels of the second monolithic element (106; 206; 306; 406) are coated with an active catalytic substance such as 'a priming catalyst. Dispositif d'échappement pour moteur à combustion interne selon l'une quelconque des revendications 2 à 3, caractérisé en ce que lorsque l'angle dudit coude (107;207;307) est proche de 90°, l'extrémité d'entrée (108;208;308) dudit second élément monolithique (106;206;306) forme un angle compris entre 15° et 30° avec le plan normal à l'axe longitudinal dudit second élément monolithique (106;206;306).Exhaust device for internal combustion engine according to any one of claims 2 to 3, characterized in that when the angle of said elbow (107; 207; 307) is close to 90 °, the inlet end ( 108; 208; 308) of said second monolithic element (106; 206; 306) forms an angle between 15 ° and 30 ° with the plane normal to the longitudinal axis of said second monolithic element (106; 206; 306). Dispositif d'échappement pour moteur à combustion interne selon l'une quelconque des revendications 1 à 4, caractérisé en ce que ledit coude (207) s'étend au niveau de la connexion d'un turbocompresseur (212) avec ledit pot catalytique (202).Exhaust device for internal combustion engine according to any one of claims 1 to 4, characterized in that said elbow (207) extends at the connection of a turbocharger (212) with said catalytic converter (202 ). Dispositif d'échappement pour moteur à combustion interne selon l'une quelconque des revendications 1 à 5, caractérisé en ce que ledit pot catalytique (102;302;402) est relié directement au collecteur d'échappement (101;301;401), le second élément monolithique (106;306;406) étant inséré pour partie dans l'entrée du pot catalytique (102;302;402) et pour partie dans le collecteur d'échappement (101;301;401).Exhaust device for an internal combustion engine according to any one of Claims 1 to 5, characterized in that the said catalytic converter (102; 302; 402) is connected directly to the exhaust manifold (101; 301; 401), the second monolithic element (106; 306; 406) being inserted partly into the inlet of the catalytic converter (102; 302; 402) and partly into the exhaust manifold (101; 301; 401). Dispositif d'échappement pour moteur à combustion interne selon la revendication 6, caractérisé en ce que ledit collecteur d'échappement (101;301;401) est constitué par une unique capacité oblongue de forme triangulaire et de volume adapté, la partie de la cavité venant de face avec la culasse (104;304;404) du moteur formant la base du triangle, le sommet opposé de la cavité triangulaire comportant une unique ouverture de sortie destinée à être raccordée directement au pot catalytique (102;302;402), ledit pot catalytique (102;302;402) étant alors disposé perpendiculairement audit collecteur d'échappement (101;301;401).Exhaust device for internal combustion engine according to claim 6, characterized in that said exhaust manifold (101; 301; 401) is constituted by a single oblong capacity of triangular shape and of suitable volume, the part of the cavity coming from the front with the cylinder head (104; 304; 404) of the engine forming the base of the triangle, the opposite top of the triangular cavity having a single outlet opening intended to be connected directly to the catalytic converter (102; 302; 402), said catalytic converter (102; 302; 402) then being arranged perpendicular to said exhaust manifold (101; 301; 401). Dispositif d'échappement pour moteur à combustion interne selon l'une quelconque des revendications 2 à 8, caractérisé en ce que l'extrémité de sortie (309) des gaz brûlés du second élément monolithique (306) est tronquée parallèlement à son extrémité d'entrée (308) et/ou les extrémités d'entrée (310) et de sortie (311) du premier élément monolithique (305) sont tronquées parallèlement à l'extrémité de sortie (309) du second élément monolithique (306).Exhaust device for an internal combustion engine according to any one of Claims 2 to 8, characterized in that the outlet end (309) of the burnt gases from the second monolithic element (306) is truncated parallel to its end of inlet (308) and / or the inlet (310) and outlet (311) ends of the first monolithic element (305) are truncated parallel to the outlet end (309) of the second monolithic element (306). Dispositif d'échappement pour moteur à combustion interne selon l'une quelconque des revendications 1 à 9, caractérisé en ce que le premier élément monolithique (105;205;305;405) et le second élément monolithique (106;206;306;406) ne font qu'un.Exhaust device for an internal combustion engine according to any one of Claims 1 to 9, characterized in that the first monolithic element (105; 205; 305; 405) and the second monolithic element (106; 206; 306; 406 ) Only do one.
EP97400994A 1996-05-10 1997-05-02 Exhaust system for internal combustion engines Withdrawn EP0806554A1 (en)

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FR9605826A FR2748518B1 (en) 1996-05-10 1996-05-10 EXHAUST DEVICE FOR INTERNAL COMBUSTION ENGINE
FR9605826 1996-05-10

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FR3060409A1 (en) * 2016-12-16 2018-06-22 Peugeot Citroen Automobiles Sa GAS TREATMENT DEVICE WITH BEVEL TREATMENT BODY
EP3234315B1 (en) * 2014-12-18 2019-08-28 Renault S.A.S. Vehicle powertrain assembly with improved exhaust gas cleaning system

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FR2860035A1 (en) * 2003-09-19 2005-03-25 Renault Sa Exhaust assembly for overfed heat engine, has wall joint that is provided between exhaust gas collector and conical divergent pipe connected to primary catalyst
EP3234315B1 (en) * 2014-12-18 2019-08-28 Renault S.A.S. Vehicle powertrain assembly with improved exhaust gas cleaning system
FR3060409A1 (en) * 2016-12-16 2018-06-22 Peugeot Citroen Automobiles Sa GAS TREATMENT DEVICE WITH BEVEL TREATMENT BODY

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