EP0434578A1 - Exhaust outlet with venturi - Google Patents

Exhaust outlet with venturi Download PDF

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Publication number
EP0434578A1
EP0434578A1 EP90420545A EP90420545A EP0434578A1 EP 0434578 A1 EP0434578 A1 EP 0434578A1 EP 90420545 A EP90420545 A EP 90420545A EP 90420545 A EP90420545 A EP 90420545A EP 0434578 A1 EP0434578 A1 EP 0434578A1
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EP
European Patent Office
Prior art keywords
outlet
exhaust
exhaust outlet
downstream
orifice
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Withdrawn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
EP90420545A
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German (de)
French (fr)
Inventor
Paul Deville
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Devil SA
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Devil SA
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Publication date
Application filed by Devil SA filed Critical Devil SA
Publication of EP0434578A1 publication Critical patent/EP0434578A1/en
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    • 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
    • F01N13/20—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 flared outlets, e.g. of fish-tail shape
    • 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
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • 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
    • F01N13/082—Other arrangements or adaptations of exhaust conduits of tailpipe, e.g. with means for mixing air with exhaust for exhaust cooling, dilution or evacuation

Definitions

  • the present invention relates to exhaust outlets intended to form the end zone of an exhaust line of an internal combustion engine.
  • the exhaust outlets are generally intended to be connected at the outlet of an exhaust gas conduction pipe, for example the outlet of a silencer, and they comprise an inlet orifice provided with means for connection to said pipe. conduction of exhaust gas, and an outlet orifice open to the open air for the outlet of gases, gas conduction means ensuring the passage of gases from the inlet orifice to the orifice exit.
  • the exhaust outlets are formed of a simple cylindrical tube.
  • the exhaust outlet comprises an inner tube surrounded by a cylindrical outer envelope.
  • the inner tube has an upstream portion which narrows and is connected to a downstream portion which widens, to provide an annular space between the inner tube and the outer casing.
  • the fumes produced in the crankcase are introduced into the annular space, where they are burned by the heat given off by the exhaust gases through the inner tube.
  • the narrowed and then flared shape of the inner tube associated with the cylindrical shape of the outer envelope, has the effect of increasing the heat exchanges between the exhaust gases and the fumes.
  • the shape shown in the drawings, not specified in the description is such that the ratio between the narrowed portion section and the cylindrical downstream portion section is approximately 0.25. This form is unfavorable to the performance of the engine, and disadvantageously modifies the sound of the exhaust by a shift towards the treble.
  • Facing noise corresponds to the very brief rise in noise level of an exhaust when the accelerator is suddenly released. It is a noise peak in relatively low frequencies, of the order of 100 hertz, which follows the continuous noise produced by the exhaust when the engine is in continuous operation, and which precedes the subsequent reduction in noise following the decrease in engine speed.
  • the measurement of the face noise is part of the standard tests for homologation of exhausts.
  • the present invention has in particular for object to reduce the noise produced by an exhaust outlet, and more particularly the noise of restoration, without disturbing the operation of the engine and in particular without appreciably decreasing the power which it can deliver.
  • a particular embodiment of the present invention also makes it possible to very significantly reduce the deposits of solid or liquid particles in the vicinity of the outlet orifice of the exhaust. This avoids that liquid particles brought in by the exhaust gases drip through the outlet orifice, and that solid particles settle around the outlet orifice, producing a degradation of the aesthetic appearance of the outlet. exhaust.
  • the above effects are obtained by retaining the internal aunterlic qualities of the exhaust outlet, that is to say without disturbing the power developed by the internal combustion engine to which the outlet of exhaust.
  • Another advantage of the invention is to slightly modify the tone of the exhaust outlet, by producing a slightly lower tone by eliminating certain high components. frequencies.
  • the axial tubular pipe comprises an upstream portion of axial venturi-shaped pipe, bounded by upstream walls of convergent venturi at an open angle connecting, in a narrowed portion, to downstream walls of divergent venturi at a smaller angle, the tubular pipe axial further comprising a downstream cylindrical portion of axial pipe connected continuously to the downstream walls of venturi.
  • the ratio between the narrowed portion section of the venturi and the downstream cylindrical portion section of the axial tubular pipe is between approximately 0.35 and 0.70. Good results have been obtained in particular for a ratio equal to approximately 0.50.
  • the shape of the inner tube described or drawn in document WO-A-8,905,394 is not suitable for obtaining such an effect of reducing the reduction noise without disturbing the operation of the engine.
  • the downstream cylindrical portion of axial tubular channel is connected to an intermediate expansion chamber which itself connects to an outlet tube leading the gases to the outlet orifice.
  • the central area of intermediate expansion chamber wall includes at least one outlet for dust and liquids in its lower part.
  • the intermediate expansion chamber has the effect of capturing the solid or liquid particles which are entrained by the exhaust gases, these particles being advantageously evacuated by the orifice for evacuating dust and liquids. In this way, the exhaust outlet keeps its cleanliness to the maximum in the vicinity of the outlet orifice.
  • the collecting tube comprises lights distributed around the periphery of its wall, and an air inlet is provided for the admission of outside air through the lights.
  • the air drawn back by the lights is recirculated and dilutes the exhaust gases.
  • this recirculation of fresh air improves the flow of gases and produces a peripheral layer of fresh air at the outlet, which protects the area of the outlet from hot and polluted gases. .
  • the exhaust outlet comprises an inlet port 1 shaped for its connection to an exhaust gas conduction pipe not shown in the figures, and an outlet port 2 open to open air for gas outlet.
  • the exhaust outlet conducts the gases from the inlet orifice 1 to the outlet orifice 2, by an axial tubular pipe comprising an upstream portion 18 in the form of a venturi, and a downstream cylindrical portion 3 connected to said upstream portion 18.
  • the upstream portion 18 in the form of a venturi is limited by upstream walls 16 converging at an open angle A connecting, in a narrowed portion 15, to downstream walls 17 and diverging at an angle B smaller than the angle A.
  • the angle open A upstream walls 16 is advantageously between 60 and 90 degrees approximately.
  • the angle B of downstream walls 17 is advantageously between 7 and 30 degrees approximately.
  • the venturi is characterized by the ratio between the minimum passage section S1 or section of the narrowed portion 15, and the maximum passage section S2 or section of the downstream cylindrical portion 3.
  • the relationship between the section S1 of narrowed portion and the section S2 of cylindrical downstream portion is between 0.35 and 0.70 approximately, advantageously equal to approximately 0.50.
  • the upstream walls 16 of venturi are connected to the inlet port 1, and the section of the inlet port is larger than the section S2 of downstream cylindrical portion.
  • downstream cylindrical portion 3 continues up to the outlet orifice 2, and ends in a rounded edge 10 turned towards the outside.
  • An outer casing 12 covers all of the lateral faces of upstream portion 18 in the form of a venturi and of downstream cylindrical portion 3.
  • the outer casing 12 is connected to the upstream walls 16.
  • the periphery of the rim 10, forming the outlet orifice 2 is non-contiguous with the end edge 13 of the outer casing 12, defining an annular passage 14.
  • the outer casing 12 can for example be cylindrical, or conical, flaring in the direction of the outlet orifice 2.
  • the upstream exhaust outlet portion is identical to that of Figure 1.
  • the downstream cylindrical portion 3 is connected to an intermediate expansion chamber 4
  • An outlet tube 5 conducts the exhaust gases from the intermediate expansion chamber 4 to the outlet orifice 2.
  • the intermediate expansion chamber 4 comprises a first portion 6 with divergent walls in the direction of flow of the exhaust gas, adjacent to the junction with the downstream cylindrical portion 3, and comprises a second portion 7 with walls converging in the direction of flow of the exhaust gases, adjacent to the junction with the outlet tube 5.
  • the divergent walls of the first portion 6 substantially form a cone, the angle of the apex of which may advantageously be between 70 and 100 degrees approximately, for example close to 90 degrees. It is the same converging walls of the second portion 7 of expansion chamber.
  • downstream cylindrical portion 3 advantageously has a smaller section than the section of the outlet tube 5.
  • first portion 6 of intermediate expansion chamber are advantageously connected to the walls of second portion 7 according to a central zone 8 of wall of intermediate expansion chamber having a rounded profile.
  • the central zone 8 of the wall of the intermediate expansion chamber advantageously comprises at least one discharge orifice 9, in its lower part, for the evacuation of dust and liquids brought in by the gases. exhaust in the downstream cylindrical portion 3 and trapped in the expansion chamber 4.
  • An outer casing 12 also covers all of the lateral faces of the upstream portion 18 in the form of a venturi, of the downstream cylindrical portion 3, of the intermediate expansion chamber 4 and of the outlet tube 5, as shown in the figure.
  • this exhaust outlet is shown along a longitudinal axis I-I in the vertical direction.
  • this exhaust outlet is intended to be used preferably in a horizontal position, that is to say with its longitudinal axis I-I disposed horizontally or at a slight inclination relative to the horizontal.
  • the lower wall of the outer casing 12 can advantageously be divergent, or inclined downward, to facilitate the evacuation of dust and liquids originating from the intermediate expansion chamber 4 and evacuated through the evacuation orifice 9.
  • the outlet tube 5 is cylindrical and ends with the rounded flange 10 turned towards the outside, forming the outlet orifice 2.
  • the outlet tube advantageously comprises lights 11 distributed around the periphery of its wall, for example lights oblong inclined with respect to the longitudinal axis II.
  • the exhaust gases flow into the downstream cylindrical portion 3.
  • the first portion 6 of the expansion chamber is strongly in depression compared to the rest of the chamber, and captures the particles in suspension in the exhaust gases. These particles are deposited in the lower part of the expansion chamber 4, and are evacuated by gravity through the lower evacuation orifice 9.
  • the first portion of the outlet tube 5 is in slight depression, and air is sucked in from the outside. through the lights 11 and the annular passage 14 air inlet.
  • the sucked air entering through the ports 11 dilutes the exhaust gases.
  • This air circulation improves the flow of gases and creates a peripheral air layer which protects the rim 10 from deposits of solid or liquid particles still in suspension in the exhaust gases.
  • This air circulation also improves the ventilation behavior of the exhaust outlet, and avoids disturbing the power of the internal combustion engine despite the presence of the expansion chamber 4.
  • the outer casing 12 protects the axial tubular pipe. Its function is also to create a volume around the central parts of the exhaust outlet, a volume which gives a more serious sound characteristic of the exhaust, by eliminating certain high frequency components.
  • the different tubular parts of the exhaust outlet may be cylindrical or conical in revolution, that is to say have a circular cross section.
  • the different tubular parts can have an oval, polygonal or other cross section.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Processes For Solid Components From Exhaust (AREA)

Abstract

The exhaust outlet according to the invention comprises an upstream section (18) in the shape of a venturi, limited by convergent upstream walls (16) having an open angle and connecting, in a narrowed section (15), with divergent downstream walls (17) having a more reduced angle, and a downstream cylindrical portion (3) continuously connected to the downstream walls (17) of the upstream portion (18). The presence of the upstream portion (18) in the shape of a venturi allows a substantial reduction in exhaust noise without significantly affecting the power available from the engine. <IMAGE>

Description

La présente invention concerne les sorties d'échappement destinées à former la zone d'extrémité d'une ligne d'échappement de moteur à combustion interne.The present invention relates to exhaust outlets intended to form the end zone of an exhaust line of an internal combustion engine.

Les sorties d'échappement sont généralement destinées à être raccordées en sortie d'une canalisation de conduction de gaz d'échappement, par exemple la sortie d'un silencieux, et elles comprennent un orifice d'entrée muni de moyens de raccordement à ladite canalisation de conduction de gaz d'échappement, et un orifice de sortie ouvert à l'air libre pour la sortie des gaz, des moyens de conduction des gaz assurant le passage des gaz depuis l'orifice d'entrée jusqu'à l'orifice de sortie.The exhaust outlets are generally intended to be connected at the outlet of an exhaust gas conduction pipe, for example the outlet of a silencer, and they comprise an inlet orifice provided with means for connection to said pipe. conduction of exhaust gas, and an outlet orifice open to the open air for the outlet of gases, gas conduction means ensuring the passage of gases from the inlet orifice to the orifice exit.

Dans leur forme la plus dépouillée, les sorties d'échappement sont formées d'un simple tube cylindrique.In their most stripped form, the exhaust outlets are formed of a simple cylindrical tube.

Dans une réalisation spécifique décrite dans le document WO-A-8 905 394, la sortie d'échappement comprend un tube intérieur entouré d'une enveloppe extérieure cylindrique. Le tube intérieur comporte une portion amont qui se rétrécit et se raccorde à une portion aval qui s'élargit, pour ménager un espace annulaire entre le tube intérieur et l'enveloppe extérieure. Les fumées produites dans le carter moteur sont introduites dans l'espace annulaire, où elles sont brûlées par la chaleur dégagée par les gaz d'échappement à travers le tube intérieur. La forme rétrécie puis évasée du tube intérieur, associée à la forme cylindrique de l'enveloppe extérieure, a pour effet d'augmenter les échanges thermiques entre les gaz d'échappement et les fumées. La forme représentée sur les dessins, non précisée dans la description, est telle que le rapport entre la section de partie rétrécie et la section de portion aval cylindrique est d'environ 0,25. Cette forme est défavorable au rendement du moteur, et modifie désavantageusement la sonorité de l'échappement par un décalage vers les aigus.In a specific embodiment described in document WO-A-8,905,394, the exhaust outlet comprises an inner tube surrounded by a cylindrical outer envelope. The inner tube has an upstream portion which narrows and is connected to a downstream portion which widens, to provide an annular space between the inner tube and the outer casing. The fumes produced in the crankcase are introduced into the annular space, where they are burned by the heat given off by the exhaust gases through the inner tube. The narrowed and then flared shape of the inner tube, associated with the cylindrical shape of the outer envelope, has the effect of increasing the heat exchanges between the exhaust gases and the fumes. The shape shown in the drawings, not specified in the description, is such that the ratio between the narrowed portion section and the cylindrical downstream portion section is approximately 0.25. This form is unfavorable to the performance of the engine, and disadvantageously modifies the sound of the exhaust by a shift towards the treble.

On a toujours cherché à réduire le bruit produit par l'échappement d'un moteur à combustion interne, notamment en disposant un ou plusieurs silencieux dans la ligne d'échappement. Le bruit d'un système d'échappement peut être aisément mesuré, pour divers régimes du moteur à combustion interne, et pour des régimes continus aussi bien que pour des régimes transitoires. Des essais normalisés ont été définis pour l'homologation d'échappements de véhicules équipant des moteurs à combustion interne.We have always sought to reduce the noise produced by the exhaust of an internal combustion engine, in particular by having one or more silencers in the exhaust line. The noise of an exhaust system can be easily measured, for various speeds of the internal combustion engine, and for continuous speeds as well as for transient speeds. Standard tests have been defined for the approval of exhaust systems for vehicles fitted with internal combustion.

On doit notamment distinguer d'une part le bruit d'échappement produit en régime continu du moteur, le moteur étant alors à vide, à régime stabilisé, et d'autre part le bruit de ravalement. Le bruit de ravalement correspond à l'élévation très brève du niveau sonore d'un échappement lorsqu'on relache brutalement l'accélérateur. Il s'agit d'un pic de bruit dans des fréquences relativement basses, de l'ordre de 100 hertz, qui suit le bruit continu produit par l'échappement lorsque le moteur est en régime continu, et qui précède la diminution ultérieure de bruit faisant suite à la diminution du régime moteur. La mesure du bruit de ravalement fait partie des essais normalisés d'homologation des échappements.One must in particular distinguish on the one hand the exhaust noise produced in continuous engine speed, the engine then being idle, at steady speed, and on the other hand the noise of restoration. Facing noise corresponds to the very brief rise in noise level of an exhaust when the accelerator is suddenly released. It is a noise peak in relatively low frequencies, of the order of 100 hertz, which follows the continuous noise produced by the exhaust when the engine is in continuous operation, and which precedes the subsequent reduction in noise following the decrease in engine speed. The measurement of the face noise is part of the standard tests for homologation of exhausts.

Parallèlement, on a constaté qu'une réduction de bruit d'échappement entraîne assez souvent une réduction de la puissance que peut délivrer le moteur à combustion interne auquel est raccordé l'échappement. Ainsi, pour un même régime moteur, un premier échappement connecté au moteur et produisant un bruit relativement faible conduira généralement à une diminution de puissance moteur par rapport à un échappement procurant un bruit plus élevé.At the same time, it has been found that a reduction in exhaust noise quite often leads to a reduction in the power that can be delivered by the internal combustion engine to which the exhaust is connected. Thus, for the same engine speed, a first exhaust connected to the engine and producing a relatively low noise will generally lead to a reduction in engine power compared to an exhaust providing a higher noise.

La présente invention a notamment pour objet de réduire le bruit produit par une sortie d'échappement, et plus particulièrement le bruit de ravalement, sans perturber le fonctionnement du moteur et notamment sans diminuer sensiblement la puissance qu'il peut délivrer.The present invention has in particular for object to reduce the noise produced by an exhaust outlet, and more particularly the noise of restoration, without disturbing the operation of the engine and in particular without appreciably decreasing the power which it can deliver.

Une réalisation particulière de la présente invention permet en outre de réduire très sensiblement les dépôts de particules solides ou liquides au voisinage de l'orifice de sortie de l'échappement. On évite ainsi que des particules liquides amenées par les gaz d'échappement s'égouttent par l'orifice de sortie, et que des particules solides se déposent autour de l'orifice de sortie, produisant une dégradation de l'aspect esthétique de la sortie d'échappement.A particular embodiment of the present invention also makes it possible to very significantly reduce the deposits of solid or liquid particles in the vicinity of the outlet orifice of the exhaust. This avoids that liquid particles brought in by the exhaust gases drip through the outlet orifice, and that solid particles settle around the outlet orifice, producing a degradation of the aesthetic appearance of the outlet. exhaust.

Selon l'invention, les effets ci-dessus sont obtenus en conservant les qualités aérauliques internes de la sortie d'échappement, c'est-à-dire sans perturber la puissance développée par le moteur à combustion interne auquel est raccordée la sortie d'échappement.According to the invention, the above effects are obtained by retaining the internal aeraulic qualities of the exhaust outlet, that is to say without disturbing the power developed by the internal combustion engine to which the outlet of exhaust.

Un autre avantage de l'invention est de modifier légèrement la sonorité de la sortie d'échappement, en produisant une sonorité légèrement plus grave par élimination de certaines composantes hautes fréquences.Another advantage of the invention is to slightly modify the tone of the exhaust outlet, by producing a slightly lower tone by eliminating certain high components. frequencies.

Pour atteindre ces objets ainsi que d'autres, la sortie d'échappement selon l'invention comprend:

  • un orifice d'entrée, muni de moyens de raccordement à une canalisation de conduction de gaz d'échappement,
  • un orifice de sortie ouvert à l'air libre pour la sortie des gaz,
  • une canalisation tubulaire axiale assurant le passage des gaz depuis l'orifice d'entrée jusqu'à l'orifice de sortie.
To achieve these and other objects, the exhaust outlet according to the invention comprises:
  • an inlet orifice, provided with means for connection to an exhaust gas conduction pipe,
  • an outlet open to the open air for the outlet of gases,
  • an axial tubular pipe ensuring the passage of gases from the inlet orifice to the outlet orifice.

La canalisation tubulaire axiale comporte une portion amont de canalisation axiale en forme de venturi, limitée par des parois amont de venturi convergentes à angle ouvert se raccordant, dans une partie rétrécie, à des parois aval de venturi divergentes à angle plus réduit, la canalisation tubulaire axiale comportant en outre une portion aval cylindrique de canalisation axiale raccordée de manière continue aux parois aval de venturi.The axial tubular pipe comprises an upstream portion of axial venturi-shaped pipe, bounded by upstream walls of convergent venturi at an open angle connecting, in a narrowed portion, to downstream walls of divergent venturi at a smaller angle, the tubular pipe axial further comprising a downstream cylindrical portion of axial pipe connected continuously to the downstream walls of venturi.

Le rapport entre la section de partie rétrécie de venturi et la section de portion aval cylindrique de canalisation tubulaire axiale est compris entre 0,35 et 0,70 environ. De bons résultats ont été obtenus en particulier pour un rapport égal à 0,50 environ.The ratio between the narrowed portion section of the venturi and the downstream cylindrical portion section of the axial tubular pipe is between approximately 0.35 and 0.70. Good results have been obtained in particular for a ratio equal to approximately 0.50.

Une telle structure à venturi réduit très sensiblement le bruit de ravalement. Cet effet de diminution sensible de bruit de ravalement est vraisemblablement dû au fait que la zone de rétrécissement constitue un obstacle pour les ondes acoustiques provenant de l'orifice de sortie et se propageant vers l'orifice d'entrée, et constitue également un obstacle pour les ondes acoustiques provenant de la canalisation d'échappement et se dirigeant vers l'orifice d'entrée. Tous se passe comme si l'on réduisait ainsi le volume de la colonne gazeuse située depuis l'orifice de sortie en direction du silencieux de sortie. Cette réduction de volume fait disparaître certaines fréquences de résonance basse correspondant au bruit de ravalement.Such a venturi structure very significantly reduces the noise of facing. This effect of appreciably reducing the reduction noise is probably due to the fact that the narrowing zone constitutes an obstacle for the acoustic waves coming from the outlet orifice and propagating towards the inlet orifice, and also constitutes an obstacle for the acoustic waves coming from the exhaust pipe and going towards the inlet. All happens as if the volume of the gas column located from the outlet orifice was reduced in the direction of the outlet silencer. This reduction in volume causes certain low resonance frequencies to disappear, corresponding to the back-up noise.

La forme de tube intérieur décrite ou dessinée dans le document WO-A-8 905 394 n'est pas adaptée pour obtenir un tel effet de diminution du bruit de ravalement sans perturber le fonctionnement du moteur.The shape of the inner tube described or drawn in document WO-A-8,905,394 is not suitable for obtaining such an effect of reducing the reduction noise without disturbing the operation of the engine.

Selon un mode de réalisation particulier, la portion aval cylindrique de canalisation tubulaire axiale se raccorde à une chambre intermédiaire de détente se raccordant elle-même à un tube de sortie conduisant les gaz jusqu'à l'orifice de sortie. La zone centrale de paroi de chambre intermédiaire de détente comprend au moins un orifice d'évacuation de poussières et de liquides dans sa partie inférieure. La chambre intermédiaire de détente a pour effet de capter les particules solides ou liquides qui sont entraînées par les gaz d'échappement, ces particules étant avantageusement évacuées par l'orifice d'évacuation de poussières et de liquides. De cette manière, la sortie d'échappement conserve au maximum sa propreté au voisinage de l'orifice de sortie.According to a particular embodiment, the downstream cylindrical portion of axial tubular channel is connected to an intermediate expansion chamber which itself connects to an outlet tube leading the gases to the outlet orifice. The central area of intermediate expansion chamber wall includes at least one outlet for dust and liquids in its lower part. The intermediate expansion chamber has the effect of capturing the solid or liquid particles which are entrained by the exhaust gases, these particles being advantageously evacuated by the orifice for evacuating dust and liquids. In this way, the exhaust outlet keeps its cleanliness to the maximum in the vicinity of the outlet orifice.

Selon un mode de réalisation avantageux, le tube collecteur comprend des lumières réparties sur le pourtour de sa paroi, et une entrée d'air est prévue pour l'admission d'air extérieur à travers les lumières. L'air réaspiré par les lumières est recirculé et dilue les gaz d'échappement. En outre, cette recirculation d'air frais améliore l'écoulement des gaz et produit une couche périphérique d'air frais au niveau de l'orifice de sortie, qui protège la zone de l'orifice de sortie par rapport aux gaz chauds et pollués.According to an advantageous embodiment, the collecting tube comprises lights distributed around the periphery of its wall, and an air inlet is provided for the admission of outside air through the lights. The air drawn back by the lights is recirculated and dilutes the exhaust gases. In addition, this recirculation of fresh air improves the flow of gases and produces a peripheral layer of fresh air at the outlet, which protects the area of the outlet from hot and polluted gases. .

D'autres objets, caractéristiques et avantages de la présente invention ressortiront de la description suivante de modes de réalisation particuliers, faite en relation avec les figures jointes, dans lesquelles:

  • la figure 1 est une coupe longitudinale d'une sortie d'échappement selon un premier mode de réalisation de la présente invention; et
  • la figure 2 est une coupe longitudinale d'une sortie d'échappement selon un second mode de réalisation de la présente invention.
Other objects, characteristics and advantages of the present invention will emerge from the following description of particular embodiments, made in relation to the attached figures, in which:
  • Figure 1 is a longitudinal section of an exhaust outlet according to a first embodiment of the present invention; and
  • Figure 2 is a longitudinal section of an exhaust outlet according to a second embodiment of the present invention.

Comme le représentent les figures, la sortie d'échappement selon l'invention comprend un orifice d'entrée 1 conformé pour son raccordement à une canalisation de conduction de gaz d'échappement non représentée sur les figures, et un orifice de sortie 2 ouvert à l'air libre pour la sortie des gaz. La sortie d'échappement conduit les gaz depuis l'orifice d'entrée 1 jusqu'à l'orifice de sortie 2, par une canalisation tubulaire axiale comportant une portion amont 18 en forme de venturi, et une portion aval 3 cylindrique raccordée à ladite portion amont 18.As shown in the figures, the exhaust outlet according to the invention comprises an inlet port 1 shaped for its connection to an exhaust gas conduction pipe not shown in the figures, and an outlet port 2 open to open air for gas outlet. The exhaust outlet conducts the gases from the inlet orifice 1 to the outlet orifice 2, by an axial tubular pipe comprising an upstream portion 18 in the form of a venturi, and a downstream cylindrical portion 3 connected to said upstream portion 18.

La portion amont 18 en forme de venturi est limitée par des parois amont 16 convergentes à angle A ouvert se raccordant, dans une partie rétrécie 15, à des parois aval 17 et divergentes à angle B plus réduit que l'angle A. L'angle ouvert A des parois amont 16 est avantageusement compris entre 60 et 90 degrés environ. L'angle B des parois aval 17 est avantageusement compris entre 7 et 30 degrés environ. Le venturi est caractérisé par le rapport entre la section de passage minimale S1 ou section de la partie rétrécie 15, et la section de passage maximale S2 ou section de la portion aval cylindrique 3. Le rapport entre la section S1 de partie rétrécie et la section S2 de portion aval cylindrique est compris entre 0,35 et 0,70 environ, avantageusement égal à 0,50 environ.The upstream portion 18 in the form of a venturi is limited by upstream walls 16 converging at an open angle A connecting, in a narrowed portion 15, to downstream walls 17 and diverging at an angle B smaller than the angle A. The angle open A upstream walls 16 is advantageously between 60 and 90 degrees approximately. The angle B of downstream walls 17 is advantageously between 7 and 30 degrees approximately. The venturi is characterized by the ratio between the minimum passage section S1 or section of the narrowed portion 15, and the maximum passage section S2 or section of the downstream cylindrical portion 3. The relationship between the section S1 of narrowed portion and the section S2 of cylindrical downstream portion is between 0.35 and 0.70 approximately, advantageously equal to approximately 0.50.

Dans les modes de réalisation représentés, les parois amont 16 de venturi se raccordent à l'orifice d'entrée 1, et la section de l'orifice d'entrée est plus grande que la section S2 de portion aval cylindrique.In the embodiments shown, the upstream walls 16 of venturi are connected to the inlet port 1, and the section of the inlet port is larger than the section S2 of downstream cylindrical portion.

Dans le mode de réalisation représenté sur la figure 1, la portion aval cylindrique 3 se poursuit jusqu'à l'orifice de sortie 2, et se termine par un rebord 10 arrondi retourné vers l'extérieur.In the embodiment shown in FIG. 1, the downstream cylindrical portion 3 continues up to the outlet orifice 2, and ends in a rounded edge 10 turned towards the outside.

Une enveloppe extérieure 12 recouvre la totalité des faces latérales de portion amont 18 en forme de venturi et de portion aval cylindrique 3. Dans la zone de l'orifice d'entrée 1, l'enveloppe extérieure 12 se raccorde aux parois amont 16. Par contre, dans la zone de l'orifice de sortie 2, la périphérie du rebord 10, formant l'orifice de sortie 2, est non-jointive avec le bord extrême 13 de l'enveloppe extérieure 12, définissant un passage annulaire 14. L'enveloppe extérieure 12 peut par exemple être cylindrique, ou conique s'évasant en direction de l'orifice de sortie 2.An outer casing 12 covers all of the lateral faces of upstream portion 18 in the form of a venturi and of downstream cylindrical portion 3. In the region of the inlet orifice 1, the outer casing 12 is connected to the upstream walls 16. By against, in the zone of the outlet orifice 2, the periphery of the rim 10, forming the outlet orifice 2, is non-contiguous with the end edge 13 of the outer casing 12, defining an annular passage 14. L the outer casing 12 can for example be cylindrical, or conical, flaring in the direction of the outlet orifice 2.

Dans le mode de réalisation de la figure 2, la portion amont de sortie d'échappement est identique à celle de la figure 1. Par contre, dans ce mode de réalisation, la portion aval cylindrique 3 se raccorde à une chambre intermédiaire de détente 4. Un tube de sortie 5 conduit les gaz d'échappement depuis la chambre intermédiaire de détente 4 jusqu'à l'orifice de sortie 2. La chambre intermédiaire de détente 4 comprend une première portion 6 à parois divergentes dans le sens d'écoulement des gaz d'échappement, adjacente à la jonction avec la portion aval cylindrique 3, et comprend une seconde portion 7 à parois convergentes dans le sens d'écoulement des gaz d'échappement, adjacente à la jonction avec le tube de sortie 5.In the embodiment of Figure 2, the upstream exhaust outlet portion is identical to that of Figure 1. On the other hand, in this embodiment, the downstream cylindrical portion 3 is connected to an intermediate expansion chamber 4 An outlet tube 5 conducts the exhaust gases from the intermediate expansion chamber 4 to the outlet orifice 2. The intermediate expansion chamber 4 comprises a first portion 6 with divergent walls in the direction of flow of the exhaust gas, adjacent to the junction with the downstream cylindrical portion 3, and comprises a second portion 7 with walls converging in the direction of flow of the exhaust gases, adjacent to the junction with the outlet tube 5.

Les parois divergentes de première portion 6 forment sensiblement un cône dont l'angle au sommet peut avantageusement être compris entre 70 et 100 degrés environ, par exemple voisin de 90 degrés. Il en est de même des parois convergentes de seconde portion 7 de chambre de détente.The divergent walls of the first portion 6 substantially form a cone, the angle of the apex of which may advantageously be between 70 and 100 degrees approximately, for example close to 90 degrees. It is the same converging walls of the second portion 7 of expansion chamber.

De bons résultats ont été obtenus en prévoyant une chambre de détente 4 dont la section maximale, dans la zone de raccordement entre la première portion 6 et la seconde portion 7, est au moins 50% plus grande que la section de portion aval cylindrique 3.Good results have been obtained by providing an expansion chamber 4, the maximum section of which, in the connection zone between the first portion 6 and the second portion 7, is at least 50% larger than the section of downstream cylindrical portion 3.

Dans le mode de réalisation représenté sur la figure 2, la portion aval cylindrique 3 présente avantageusement une section plus petite que la section du tube de sortie 5.In the embodiment shown in FIG. 2, the downstream cylindrical portion 3 advantageously has a smaller section than the section of the outlet tube 5.

Les parois de première portion 6 de chambre intermédiaire de détente se raccordent avantageusement aux parois de seconde portion 7 selon une zone centrale 8 de paroi de chambre intermédiaire de détente présentant un profil arrondi. Dans le mode de réalisation de la figure 2, la zone centrale 8 de paroi de chambre intermédiaire de détente comprend avantageusement au moins un orifice d'évacuation 9, dans sa partie inférieure, pour l'évacuation des poussières et des liquides amenés par les gaz d'échappement dans la portion aval cylindrique 3 et piégés dans la chambre de détente 4.The walls of first portion 6 of intermediate expansion chamber are advantageously connected to the walls of second portion 7 according to a central zone 8 of wall of intermediate expansion chamber having a rounded profile. In the embodiment of FIG. 2, the central zone 8 of the wall of the intermediate expansion chamber advantageously comprises at least one discharge orifice 9, in its lower part, for the evacuation of dust and liquids brought in by the gases. exhaust in the downstream cylindrical portion 3 and trapped in the expansion chamber 4.

Une enveloppe extérieure 12 recouvre également la totalité des faces latérales de la portion amont 18 en forme de venturi, de la portion aval cylindrique 3, de la chambre intermédiaire de détente 4 et du tube de sortie 5, comme le représente la figure.An outer casing 12 also covers all of the lateral faces of the upstream portion 18 in the form of a venturi, of the downstream cylindrical portion 3, of the intermediate expansion chamber 4 and of the outlet tube 5, as shown in the figure.

Pour la commodité du dessin, on a représenté cette sortie d'échappement selon un axe longitudinal I-I dans le sens vertical. Naturellement, en position d'utilisation, cette sortie d'échappement est destinée à être utilisée de préférence en position horizontale, c'est-à-dire avec son axe longitudinal I-I disposé horizontalement ou selon une faible inclinaison par rapport à l'horizontale.For the convenience of the drawing, this exhaust outlet is shown along a longitudinal axis I-I in the vertical direction. Naturally, in the position of use, this exhaust outlet is intended to be used preferably in a horizontal position, that is to say with its longitudinal axis I-I disposed horizontally or at a slight inclination relative to the horizontal.

La paroi inférieure de l'enveloppe extérieure 12 peut avantageusement être divergente, ou inclinée vers le bas, pour faciliter l'évacuation des poussières et liquides provenant de la chambre intermédiaire de détente 4 et s'évacuant par l'orifice d'évacuation 9.The lower wall of the outer casing 12 can advantageously be divergent, or inclined downward, to facilitate the evacuation of dust and liquids originating from the intermediate expansion chamber 4 and evacuated through the evacuation orifice 9.

Le tube de sortie 5 est cylindrique et se termine par le rebord 10 arrondi retourné vers l'extérieur, formant l'orifice de sortie 2. Le tube de sortie comprend avantageusement des lumières 11 réparties sur le pourtour de sa paroi, par exemple des lumières oblongues inclinées par rapport à l'axe longitudinal I-I.The outlet tube 5 is cylindrical and ends with the rounded flange 10 turned towards the outside, forming the outlet orifice 2. The outlet tube advantageously comprises lights 11 distributed around the periphery of its wall, for example lights oblong inclined with respect to the longitudinal axis II.

En cours de fonctionnement, dans l'un et l'autre des modes de réalisation des figures 1 et 2, les sorties d'échappement selon la présente invention, par la présence de la portion amont 18 en forme de venturi, permettent de réduire sensiblement le bruit de ravalement. Des essais comparatifs ont pu être effectués, en banc d'essais, sur une même voiture équipée d'une ligne d'échappement spéciale ne comportant que des silencieux à passage direct. Un premier test a été effectué en équipant la voiture avec un tube de sortie cylindrique sans venturi. Un second test a été effectué en équipant la voiture avec un tube de sortie selon le mode de réalisation de la figure 1. Un troisième test a été effectué en équipant la voiture avec un tube de sortie selon le mode de réalisation de la figure 2. Dans les second et troisième tests, des dimensions différentes de venturis ont pu être essayées, avec des rapports de section compris entre 0,35 et 0,70 environ. Pour chaque test, des mesures ont été effectuées: niveau sonore lorsque le moteur est en régime stabilisé; niveau sonore de ravalement, au moment où l'on relache brusquement l'accélérateur du moteur; puissance maximale développée par le moteur. Ces mesures ont été effectuées pour plusieurs vitesses de rotation du moteur.During operation, in both of the embodiments of FIGS. 1 and 2, the exhaust outlets according to the present invention, by the presence of the upstream portion 18 in the form of a venturi, make it possible to significantly reduce the noise of restoration. Comparative tests have been carried out on a test bench on the same car fitted with a special exhaust line comprising only direct-passing silencers. A first test was carried out by equipping the car with a cylindrical outlet tube without venturi. A second test was carried out by equipping the car with an outlet tube according to the embodiment of FIG. 1. A third test was carried out by equipping the car with an outlet tube according to the embodiment of FIG. 2. In the second and third tests, different dimensions of venturis could be tested, with section ratios between approximately 0.35 and 0.70. For each test, measurements were made: noise level when the engine is in steady state; sound level of restoration, when the engine accelerator is suddenly released; maximum power developed by the engine. These measurements were made for several engine rotation speeds.

Les mesures ont montré que la présence du venturi 18 dans la sortie d'échappement permet de diminuer d'au moins un décibel le bruit de ravalement statique en régime moteur normalisé pour les essais d'homologation des systèmes d'échappement, et cela sans affecter de manière sensible la puissance du moteur, la puissance maximale étant restée constante à moins de 1% près.The measurements have shown that the presence of the venturi 18 in the exhaust outlet makes it possible to reduce by at least one decibel the noise of static reduction in normalized engine speed for the homologation tests of the exhaust systems, and this without affecting appreciably the engine power, the maximum power having remained constant within 1%.

Dans le mode de réalisation de la figure 2, après passage dans le venturi 18, les gaz d'échappement s'écoulent dans la portion aval cylindrique 3. Dans la chambre de détente 4, la première portion 6 de chambre de détente se trouve fortement en dépression par rapport au reste de la chambre, et capte les particules en suspension dans les gaz d'échappement. Ces particules se déposent dans la partie basse de la chambre de détente 4, et sont évacuées par gravité par l'orifice d'évacuation inférieur 9.In the embodiment of FIG. 2, after passing through the venturi 18, the exhaust gases flow into the downstream cylindrical portion 3. In the expansion chamber 4, the first portion 6 of the expansion chamber is strongly in depression compared to the rest of the chamber, and captures the particles in suspension in the exhaust gases. These particles are deposited in the lower part of the expansion chamber 4, and are evacuated by gravity through the lower evacuation orifice 9.

Du fait de la diminution de section du tube de sortie 5 par rapport à la section maximale de la chambre de détente 4, la première portion du tube de sortie 5 se trouve en légère dépression, et de l'air est aspiré de l'extérieur par les lumières 11 et le passage annulaire 14 d'entrée d'air. L'air aspiré pénétrant par les lumières 11 dilue les gaz d'échappement. Cette circulation d'air améliore l'écoulement des gaz et réalise une couche périphérique d'air qui protège le rebord 10 des dépôts de particules solides ou liquides encore en suspension dans les gaz d'échappement. Cette circulation d'air améliore en outre le comportement aéraulique de la sortie d'échappement, et évite de perturber la puissance du moteur à explosion malgré la présence de la chambre de détente 4.Due to the reduction in section of the outlet tube 5 relative to the maximum section of the expansion chamber 4, the first portion of the outlet tube 5 is in slight depression, and air is sucked in from the outside. through the lights 11 and the annular passage 14 air inlet. The sucked air entering through the ports 11 dilutes the exhaust gases. This air circulation improves the flow of gases and creates a peripheral air layer which protects the rim 10 from deposits of solid or liquid particles still in suspension in the exhaust gases. This air circulation also improves the ventilation behavior of the exhaust outlet, and avoids disturbing the power of the internal combustion engine despite the presence of the expansion chamber 4.

L'enveloppe extérieure 12 assure la protection de la canalisation tubulaire axiale. Sa fonction est également de créer un volume autour des parties centrales de la sortie d'échappement, volume qui donne une sonorité plus grave caractéristique de l'échappement, par élimination de certaines composantes hautes fréquences.The outer casing 12 protects the axial tubular pipe. Its function is also to create a volume around the central parts of the exhaust outlet, a volume which gives a more serious sound characteristic of the exhaust, by eliminating certain high frequency components.

Dans les modes de réalisation qui ont été représentés, les différentes parties tubulaires de la sortie d'échappement peuvent être cylindriques ou côniques de révolution, c'est-à-dire présenter une section transversale circulaire.In the embodiments which have been shown, the different tubular parts of the exhaust outlet may be cylindrical or conical in revolution, that is to say have a circular cross section.

En alternative, les différentes parties tubulaires peuvent présenter une section transversale ovale, polygonale ou autre.Alternatively, the different tubular parts can have an oval, polygonal or other cross section.

La présente invention n'est pas limitée aux modes de réalisation qui ont été explicitement décrits, mais elle en inclut les diverses variantes et généralisations contenues dans le domaine des revendications ci-après.The present invention is not limited to the embodiments which have been explicitly described, but it includes the various variants and generalizations thereof contained in the field of claims below.

Claims (11)

Sortie d'échappement, destinée à former la zone d'extrémité d'une ligne d'échappement de moteur à combustion interne, comprenant un orifice d'entrée (1) muni de moyens de raccordement à une canalisation de conduction de gaz d'échappement, et un orifice de sortie (2) ouvert à l'air libre pour la sortie des gaz, une canalisation tubulaire axiale assurant le passage des gaz depuis l'orifice d'entrée (1) jusqu'à l'orifice de sortie (2), caractérisée en ce que la canalisation tubulaire axiale comprend: - une portion amont (18) de canalisation axiale en forme de venturi, limitée par des parois amont (16) de venturi convergentes à angle ouvert A se raccordant, dans une partie rétrécie (15), à des parois aval (17) de venturi divergentes à angle plus réduit B, - une portion aval (3) cylindrique de canalisation axiale raccordée de manière continue aux parois aval (17) de venturi, - le rapport entre la section S1 de partie rétrécie (15) et la section S2 de portion aval cylindrique (3) étant compris entre 0,35 et 0,70 environ. Exhaust outlet, intended to form the end zone of an exhaust line of an internal combustion engine, comprising an inlet orifice (1) provided with means for connection to an exhaust gas conduction pipe , and an outlet orifice (2) open to the open air for the outlet of the gases, an axial tubular duct ensuring the passage of the gases from the inlet orifice (1) to the outlet orifice (2 ), characterized in that the axial tubular pipe comprises: - an upstream portion (18) of axial pipe in the form of a venturi, bounded by upstream walls (16) of convergent venturi at an open angle A connecting, in a narrowed portion (15), to downstream walls (17) of venturi diverging at a smaller angle B, a cylindrical downstream portion (3) of axial duct connected continuously to the downstream walls (17) of venturi, - The ratio between the section S1 of the narrowed portion (15) and the section S2 of the downstream cylindrical portion (3) being between about 0.35 and 0.70. Sortie d'échappement selon la revendication 1, caractérisée en ce que l'angle ouvert A des parois amont (16) est compris entre 60 et 90 degrés environ.Exhaust outlet according to claim 1, characterized in that the open angle A of the upstream walls (16) is between approximately 60 and 90 degrees. Sortie d'échappement selon l'une des revendications 1 ou 2, caractérisée en ce que l'angle B des parois aval (17) est compris entre 7 et 30 degrés environ.Exhaust outlet according to one of claims 1 or 2, characterized in that the angle B of the downstream walls (17) is between approximately 7 and 30 degrees. Sortie d'échappement selon l'une quelconque des revendications 1 à 3, caractérisée en ce que les parois amont (16) se raccordent à l'orifice d'entrée (1).Exhaust outlet according to any one of Claims 1 to 3, characterized in that the upstream walls (16) are connected to the inlet orifice (1). Sortie d'échappement selon la revendication 4, caractérisée en ce que la section de l'orifice d'entrée (1) est plus grande que la section S2 de portion aval cylindrique (3).Exhaust outlet according to claim 4, characterized in that the section of the inlet orifice (1) is larger than the section S2 of downstream cylindrical portion (3). Sortie d'échappement selon l'une quelconque des revendications 1 à 5, caractérisée en ce que la portion aval cylindrique (3) se raccorde à une chambre intermédiaire de détente (4) se raccordant elle-même à un tube de sortie (5) conduisant les gaz jusqu'à l'orifice de sortie (2).Exhaust outlet according to any one of Claims 1 to 5, characterized in that the downstream cylindrical portion (3) is connected to an intermediate expansion chamber (4) which itself connects to an outlet tube (5) leading the gases to the outlet (2). Sortie d'échappement selon la revendication 6, caractérisée en ce que le tube de sortie (5) présente une section plus grande que la section S2 de portion aval cylindrique (3).Exhaust outlet according to claim 6, characterized in that the outlet tube (5) has a larger section than the section S2 of downstream cylindrical portion (3). Sortie d'échappement selon l'une des revendications 6 ou 7, caractérisée en ce que la zone centrale (8) de paroi de chambre intermédiaire de détente (4) comprend au moins un orifice d'évacuation (9) de poussières et de liquides dans sa partie inférieure.Exhaust outlet according to either of Claims 6 and 7, characterized in that the central zone (8) of the wall of the intermediate expansion chamber (4) comprises at least one discharge orifice (9) for dust and liquids in its lower part. Sortie d'échappement selon l'une quelconque des revendications 6 à 8, caractérisée en ce que le tube de sortie (5) comprend des lumières (11) réparties sur le pourtour de sa paroi, associées à une entrée d'air (14) pour l'admission d'air extérieur à travers les lumières (11) vers l'intérieur du tube de sortie (5).Exhaust outlet according to any one of Claims 6 to 8, characterized in that the outlet tube (5) comprises lights (11) distributed around the periphery of its wall, associated with an air inlet (14) for the admission of outside air through the openings (11) towards the inside of the outlet tube (5). Sortie d'échappement selon l'une quelconque des revendications 1 à 9, caractérisée en ce qu'elle comprend une enveloppe extérieure (12) recouvrant les faces latérales de la canalisation tubulaire axiale depuis l'orifice d'entrée (1) jusqu'à l'orifice de sortie (2).Exhaust outlet according to any one of claims 1 to 9, characterized in that it comprises an outer casing (12) covering the lateral faces of the axial tubular pipe from the inlet orifice (1) to the outlet (2). Sortie d'échappement selon la revendication 10, caractérisée en ce que l'enveloppe extérieure (12) est conique, s'évasant en direction de l'orifice de sortie (2).Exhaust outlet according to claim 10, characterized in that the outer casing (12) is conical, widening in the direction of the outlet orifice (2).
EP90420545A 1989-12-20 1990-12-13 Exhaust outlet with venturi Withdrawn EP0434578A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8917206A FR2656038A1 (en) 1989-12-20 1989-12-20 EXHAUST VENTURI EXHAUST.
FR8917206 1989-12-20

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EP0434578A1 true EP0434578A1 (en) 1991-06-26

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EP (1) EP0434578A1 (en)
JP (1) JPH03290013A (en)
DE (1) DE434578T1 (en)
ES (1) ES2023619A4 (en)
FR (1) FR2656038A1 (en)
PT (1) PT96244A (en)

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FR2467974A1 (en) * 1979-10-25 1981-04-30 Letang Et Remy Sa Exhaust silencer for motor vehicle - has perforated tube through cylindrical shell formed from two halves with wire insulation
US4690245A (en) * 1983-03-17 1987-09-01 Stemco, Inc. Flattened venturi, method and apparatus for making
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US1654078A (en) * 1926-02-09 1927-12-27 Hall Charles Ward Muffler for gas engines
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GB986576A (en) * 1961-09-07 1965-03-17 Gruenzweig & Hartmann Silencer
GB2054779A (en) * 1979-07-26 1981-02-18 Deere & Co Exhaust system pipe and exhaust system with suck a pipe
FR2467974A1 (en) * 1979-10-25 1981-04-30 Letang Et Remy Sa Exhaust silencer for motor vehicle - has perforated tube through cylindrical shell formed from two halves with wire insulation
US4690245A (en) * 1983-03-17 1987-09-01 Stemco, Inc. Flattened venturi, method and apparatus for making
WO1989005394A1 (en) * 1987-11-30 1989-06-15 Caterpillar Inc. Crankcase fumes disposal system
WO1990004706A1 (en) * 1988-10-21 1990-05-03 Donaldson Company, Inc. In-line constricted sound-attenuating system

Also Published As

Publication number Publication date
DE434578T1 (en) 1991-11-28
JPH03290013A (en) 1991-12-19
FR2656038A1 (en) 1991-06-21
ES2023619A4 (en) 1992-02-01
US5174113A (en) 1992-12-29
PT96244A (en) 1991-09-30

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