EP0057623A2 - Exhaust gas silencer of a heat engine - Google Patents

Exhaust gas silencer of a heat engine Download PDF

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Publication number
EP0057623A2
EP0057623A2 EP82400070A EP82400070A EP0057623A2 EP 0057623 A2 EP0057623 A2 EP 0057623A2 EP 82400070 A EP82400070 A EP 82400070A EP 82400070 A EP82400070 A EP 82400070A EP 0057623 A2 EP0057623 A2 EP 0057623A2
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EP
European Patent Office
Prior art keywords
tubes
boss
cup
silencer
chamber
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.)
Granted
Application number
EP82400070A
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German (de)
French (fr)
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EP0057623A3 (en
EP0057623B1 (en
Inventor
Jean-Pierre Buchwalder
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.)
Peugeot Cycles SA
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Peugeot Cycles SA
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Filing date
Publication date
Application filed by Peugeot Cycles SA filed Critical Peugeot Cycles SA
Priority to AT82400070T priority Critical patent/ATE20953T1/en
Publication of EP0057623A2 publication Critical patent/EP0057623A2/en
Publication of EP0057623A3 publication Critical patent/EP0057623A3/en
Application granted granted Critical
Publication of EP0057623B1 publication Critical patent/EP0057623B1/en
Expired 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
    • 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
    • F01N1/084—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling the gases flowing through the silencer two or more times longitudinally in opposite directions, e.g. using parallel or concentric tubes

Definitions

  • exhaust mufflers for combustion engines are to minimize the noise generated by the exhaust. However, they must avoid overly braking the flow of these gases because the power of the engine would be reduced, but moreover they must have the smallest possible volume because the space available for their mounting is small, especially when it 'acts of exhaust silencer of motor vehicle.
  • silencers generally comprise a cylindrical envelope which is closed by end cups crimped onto it and in which tubes, supported by internal cups and communicating with each other in end chambers adjacent to the closure cups, guide the gas in a zigzag path.
  • the envelopes of these silencers can have a circular, oval, or other section, depending on the space available under the body for example, but in all cases each end chamber connecting the successive tubes must have a relatively large volume to avoid braking. of the gas flow, so that the size of the silencer is still often troublesome.
  • the object of the present invention is to remedy this drawback by providing an exhaust gas silencer in which the volume of the end chamber is reduced without causing braking of the gas flow and even by reducing this braking.
  • the subject of this invention is in fact a silencer for exhaust gases from a heat engine comprising an external cylindrical envelope and gas guide tubes, interconnected by at least one end chamber delimited inside the envelope by a flat intermediate cup for supporting the tubes and an end cup, in which the end cup comprises, at right of two successive tubes a rounded and hollow boss, projecting outwards, the top of which is separated from the intermediate cup by a distance slightly greater than the radius of the tubes, while the thickness of the chamber around this boss is smaller than the diameter of these tubes, so that the boss guides the change in direction of the flow of gases between these tubes.
  • the large base of the elliptical boss has a dimension which corresponds substantially to the distance between the opposite generatrices of two successive tubes of a silencer, while its small dimension is similar to the diameter of one of these tubes.
  • the rounded boss thus forms a flow guide wall, the direction of which is gradually reversed, which reduces the formation of turbulence and pressure losses.
  • the distance between the cup itself, that is to say its flat part, and the end of the tubes can be relatively small, which makes it possible to reduce the length of the cylindrical envelope and, by next, the total size of the silencer.
  • the muffler thus represented comprises a casing 1, of cylindrical shape, closed at each of its ends by a cup, respectively 2, 4.
  • the cup 2 is traversed by an exhaust gas inlet tube 6, while the cup 4 is crossed by an outlet tube 8 for these gases into the atmosphere.
  • the open end of the gas inlet tube 6 is fixed in an interior cup 10, which delimits with the corresponding end cup 4 a chamber 12.
  • the open end of the outlet tube 8 is fixed in an internal cup 14, which defines with the corresponding end cup 2 a gas chamber 16.
  • a third tube 18 connects the chambers 12 and 16, so that the gas entering through the tube 6 travels in a zigzag path forcing it to change direction twice before exiting through tube 8.
  • the end cup 2 which supports the inlet tube 6, is constituted by a planar element provided with a peripheral rim 20 directed towards the outside and having a length sufficient to be folded down and fixed by crimping on the extreme edge of the envelope 1. Furthermore, the cup 2 has a rounded boss 22, projecting outwards, which, as shown more clearly in FIG. 2, has a form base substantially elliptical.
  • the large dimension of this base corresponds substantially to the sum of the two orifices provided in the cup 14 for fixing the tubes 18 and 8, and of the cup portion which separates them, that is to say the distance which separates the two generators furthest from the tubes 18 and 8.
  • the small dimension of this boss 22 is slightly larger than the diameter of one of the tubes 18 or 8.
  • the boss 22 is obtained by stamping the cup 2 outwards, so that its wall is gradually curved and forms a surface for guiding and deflecting the flow of gas between the tubes 18 and 8.
  • the cylindrical envelope 1 having an oval base
  • the tubes 6, 18 and 8 are aligned on the major axis of this oval. Consequently, the cup 2, which also has an oval shape, has a hole for the passage of the tube 6 which is aligned with the large dimension of the boss 22.
  • the cup 4 is produced in the same way as the cup 2 and, like it, has a rounded boss 24 projecting outwards, as well as a passage orifice for the tube 8 aligned with the large dimension of the boss 24.
  • each of these cups 2 or 4 the depth of the boss is relatively large and the projection from the top to the outside of the flat part corresponds substantially to the radius of the tube 18 or 8.
  • this end cup is fixed to the envelope 1, at a relatively small axial distance from the intermediate cup 10, 14, so that the chamber 12, 16 has, around the boss 22, an axial dimension which is at most equal to the diameter of the tube 6, 18 or 8 , while at the right of the top of the boss its dimension corresponds to that of a classic extreme chamber.
  • the exhaust gases entering through the tube 6 change direction, on the one hand in the chamber 12 between the ends of the tubes 6 and 18 and the wall of the boss 24, and on the other hand in the chamber 16 between the ends of the tubes 18 and 8 and the wall of the boss 22.
  • the shape of the bosses 22 and 24 is such that these portions of the chambers 12 and 16 practically form a continuation of the tubes 6 or 18 in which, thanks to the absence of any guide wall between the tubes and the boss, the direction of the gases is changed without sudden encounter of these with the wall and with minimal braking. Consequently, it can be seen that it is no longer necessary to give the chambers 12 and 16 a large volume and that the cups 2 and 4 can be mounted much closer to the interior cups 10 and 14 than in conventional silencers. For example, the cups 2 and 4 can be brought closer to a distance corresponding to the depth of the boss 22 or 24 and thus keep a sufficient volume to, in cooperation with the particular shape of the boss, prevent braking of the fluid by facilitating its flow.
  • cups according to the invention can be used on mufflers of various types, for example on mufflers such as that shown in FIG. 3, the outer envelope 21 of which is a cylinder with a circular base.
  • the three tubes 6, 18 and 8 are no longer aligned and each end cups 26 has a boss 28, similar in shape to boss 22 or 24, and a hole for passage of the inlet tube 6, or outlet 8, formed on the side of this boss, and preferably centered on the median axis corresponding to its smallest dimension.
  • FIG. 4 shows a silencer which comprises only two tubes, a gas inlet tube 30 and a gas outlet tube 32, both fixed in the same flat end cup 34. These two tubes cross the length of the cylindrical casing 31 and open into a chamber closed by an end cup 36.
  • This cup 36 has a boss 38 for guiding and reversing the flow of gas, which projects outside the silencer and the base of which corresponds substantially to the assembly of the two end orifices of the tubes. It is obvious that if the muffler were to have more than three tubes, at least one of the end cups could have several similar bosses, each guiding the flow of fluid between two successive tubes.
  • the silencer obtained has a smaller footprint than that of a conventional silencer and, moreover, provides significantly better noise attenuation.
  • Such a type of muffler is therefore particularly suitable for reducing the noise generated by the exit of exhaust gases from motor vehicles, in which the space available under the bodywork is generally extremely reduced, but also in many other applications. this is mainly due to its high efficiency and reduced cost.

Abstract

At least one of the ends of the silencer an end chamber is defined between an intermediate planar dished wall and an end dished wall which is provided with a rounded and hollow boss. The boss substantially extends two exhaust gas tubes in front of which it is located and its apex is spaced from the intermediate dished wall by a distance which is slightly greater than the radius of the tubes so that the boss guides the change in direction of the gas flow between the tubes.

Description

Les silencieux de gaz d'échappement des moteurs thermiques ont pour principale fonction de réduire au maximum les bruits engendrés par la sortie des gaz. Ils doivent cependant éviter de trop freiner l'écoulement de ces gaz car la puissance du moteur en serait réduite, mais par ailleurs ils doivent avoir un volume le plus réduit possible car la place disponible pour leur montage est faible, tout particulièrement lorsqu'il s'agit de silencieux d'échappement de véhicule automobile.The main function of exhaust mufflers for combustion engines is to minimize the noise generated by the exhaust. However, they must avoid overly braking the flow of these gases because the power of the engine would be reduced, but moreover they must have the smallest possible volume because the space available for their mounting is small, especially when it 'acts of exhaust silencer of motor vehicle.

C'est pourquoi ces silencieux comprennent généralement une enveloppe cylindrique qui est fermée par des coupelles d'extrémité serties sur elle et dans laquelle des tubes, supportés par des coupelles intérieures et communiquant entre eux dans des chambres d'extrémité adjacentes aux coupelles de fermeture, guident le gaz selon un trajet en zig-zag.This is why these silencers generally comprise a cylindrical envelope which is closed by end cups crimped onto it and in which tubes, supported by internal cups and communicating with each other in end chambers adjacent to the closure cups, guide the gas in a zigzag path.

Les enveloppes de ces silencieux peuvent avoir une section circulaire, ovale, ou autre, selon la place disponible sous la carrosserie par exemple, mais dans tous les cas chaque chambre d'extrémité reliant les tubes successifs doit présenter un volume relativement important pour éviter le freinage de l'écoulement des gaz, de sorte que l'encombrement du silencieux reste encore souvent gênant.The envelopes of these silencers can have a circular, oval, or other section, depending on the space available under the body for example, but in all cases each end chamber connecting the successive tubes must have a relatively large volume to avoid braking. of the gas flow, so that the size of the silencer is still often troublesome.

La présente invention a pour but de remédier à cet inconvénient en fournissant un silencieux de gaz d'échappement dans lequel le volume de la chambre d'extrémité soit réduit sans provoquer de freinage de l'écoulement de gaz et même en diminuant ce freinage.The object of the present invention is to remedy this drawback by providing an exhaust gas silencer in which the volume of the end chamber is reduced without causing braking of the gas flow and even by reducing this braking.

Cette invention a en effet pour objet un silencieux de gaz d'échappement de moteur thermique comportant une enveloppe cylindrique extérieure et des tubes de guidage des gaz, reliés entre eux par au moins une chambre extrême délimitée à l'intérieur de l'enveloppe par une coupelle intermédiaire plane de support des tubes et une coupelle d'extrémité, dans lequel la coupelle d'extrémité comporte, au droit de deux tubes successifs un bossage arrondi et creux, en saillie vers l'extérieur, dont le sommet est séparé de la coupelle intermédiaire par une distance légèrement supérieure au rayon des tubes, tandis que l'épaisseur de la chambre autour de ce bossage est inférieure au diamètre de ces tubes, de sorte que le bossage guide le changement de direction de l'écoulement des gaz entre ces tubes.The subject of this invention is in fact a silencer for exhaust gases from a heat engine comprising an external cylindrical envelope and gas guide tubes, interconnected by at least one end chamber delimited inside the envelope by a flat intermediate cup for supporting the tubes and an end cup, in which the end cup comprises, at right of two successive tubes a rounded and hollow boss, projecting outwards, the top of which is separated from the intermediate cup by a distance slightly greater than the radius of the tubes, while the thickness of the chamber around this boss is smaller than the diameter of these tubes, so that the boss guides the change in direction of the flow of gases between these tubes.

En pratique la grande base du bossage elliptique a une dimension qui correspond sensiblement à la distance entre les génératrices opposées de deux tubes successifs d'un silencieux, tandis que sa petite dimension est analogue au diamètre de l'un de ces tubes.In practice, the large base of the elliptical boss has a dimension which corresponds substantially to the distance between the opposite generatrices of two successive tubes of a silencer, while its small dimension is similar to the diameter of one of these tubes.

Le bossage arrondi forme ainsi une paroi de guidage de l'écoulement, dont la direction est renversée progressivement, ce qui diminue la formation de turbulences et les pertes de charge.The rounded boss thus forms a flow guide wall, the direction of which is gradually reversed, which reduces the formation of turbulence and pressure losses.

Grâce à ce guidage la distance entre la coupelle elle-même, c'est-à-dire sa partie plane, et l'extrémité des tubes peut être relativement faible, ce qui permet de réduire la longueur de l'enveloppe cylindrique et, par suite, l'encombrement total du silencieux.Thanks to this guidance, the distance between the cup itself, that is to say its flat part, and the end of the tubes can be relatively small, which makes it possible to reduce the length of the cylindrical envelope and, by next, the total size of the silencer.

La description ci-dessous de modes de réalisation donnés à titre d'exemples non limitatifs, et représentés aux dessins annexés,fera apparaître plus clairement les avantages et caractéristiques de l'invention.The description below of embodiments given by way of nonlimiting examples, and represented in the appended drawings, will show more clearly the advantages and characteristics of the invention.

Sur ces dessins :

  • - la Fig. 1 est une vue schématique en coupe longitudinale d'un silencieux selon l'invention;
  • la Fig. 2 est une vue en perspective, à plus grande échelle, de l'une des parties extrêmes du silencieux de la Fig. 1;
  • la Fig. 3 est une vue analogue à la Fig. 2 d'un autre mode de réalisation du silencieux;
  • la Fig. 4 est une vue en élévation d'une autre variante de réalisation de l'invention.
In these drawings:
  • - Fig. 1 is a schematic view in longitudinal section of a silencer according to the invention;
  • Fig. 2 is a perspective view, on a larger scale, of one of the end parts of the silencer of FIG. 1;
  • Fig. 3 is a view similar to FIG. 2 of another embodiment of the silencer;
  • Fig. 4 is an elevational view of another alternative embodiment of the invention.

Le silencieux ainsi représenté comporte une enveloppe 1, de forme cylindrique, fermée à chacune de ses extrémités par une coupelle, respectivement 2, 4. La coupelle 2 est traversée par un tube 6 d'entrée des gaz d'échappement, tandis que la coupelle 4 est traversée par un tube 8 de sortie de ces gaz dans l'atmosphère.The muffler thus represented comprises a casing 1, of cylindrical shape, closed at each of its ends by a cup, respectively 2, 4. The cup 2 is traversed by an exhaust gas inlet tube 6, while the cup 4 is crossed by an outlet tube 8 for these gases into the atmosphere.

A l'intérieur de l'enveloppe 1 l'extrémité ouverte du tube d'entrée de gaz 6 est fixée dans une coupelle intérieure 10, qui délimite avec la coupelle d'extrémité correspondante 4 une chambre 12. De la même manière, l'extrémité ouverte du tube de sortie 8 est fixée dans une coupelle intérieure 14, qui délimite avec la coupelle d'extrémité correspondante 2 une chambre de gaz 16. Un troisième tube 18 relie les chambres 12 et 16, de sorte que le gaz entrant par le tube 6 parcourt une trajectoire en zig-zag l'obligeant à changer deux fois de direction avant de sortir par le tube 8.Inside the casing 1 the open end of the gas inlet tube 6 is fixed in an interior cup 10, which delimits with the corresponding end cup 4 a chamber 12. In the same way, the open end of the outlet tube 8 is fixed in an internal cup 14, which defines with the corresponding end cup 2 a gas chamber 16. A third tube 18 connects the chambers 12 and 16, so that the gas entering through the tube 6 travels in a zigzag path forcing it to change direction twice before exiting through tube 8.

La coupelle d'extrémité 2 qui supporte le tube d'entrée 6, est constituée par un élément plan muni d'un rebord périphérique 20 dirigé vers l'extérieur et ayant une longueur suffisante pour être rabattu et fixé par sertissage sur le bord extrême de l'enveloppe 1. En outre la coupelle 2 comporte un bossage arrondi 22, en saillie vers l'extérieur, qui, comme le montre plus clairement la Fig. 2, a une base de forme sensiblement elliptique. La grande dimension de cette base correspond sensiblement à la somme des deux orifices ménagés dans la coupelle 14 pour la fixation des tubes 18 et 8, et de la portion de coupelle qui les sépare, c'est-à-dire à la distance qui sépare les deux génératrices les plus éloignées des tubes 18 et 8. La petite dimension de ce bossage 22 est, elle, légèrement supérieure au diamètre de l'un des tubes 18 ou 8.The end cup 2 which supports the inlet tube 6, is constituted by a planar element provided with a peripheral rim 20 directed towards the outside and having a length sufficient to be folded down and fixed by crimping on the extreme edge of the envelope 1. Furthermore, the cup 2 has a rounded boss 22, projecting outwards, which, as shown more clearly in FIG. 2, has a form base substantially elliptical. The large dimension of this base corresponds substantially to the sum of the two orifices provided in the cup 14 for fixing the tubes 18 and 8, and of the cup portion which separates them, that is to say the distance which separates the two generators furthest from the tubes 18 and 8. The small dimension of this boss 22 is slightly larger than the diameter of one of the tubes 18 or 8.

De préférence le bossage 22 est obtenu par emboutissage de la coupelle 2 vers l'extérieur, de sorte que sa paroi s'incurve progressivement et forme une surface de guidage et de déviation de l'écoulement du gaz entre les tubes 18 et 8.Preferably, the boss 22 is obtained by stamping the cup 2 outwards, so that its wall is gradually curved and forms a surface for guiding and deflecting the flow of gas between the tubes 18 and 8.

Dans le mode de réalisation représenté sur les Figs. 1 et 2, l'enveloppe cylindrique 1 ayant une base ovale, les tubes 6, 18 et 8 sont alignés sur le grand axe de cet ovale. En conséquence la coupelle 2, qui a également une forme ovale, comporte un orifice de passage du tube 6 qui est aligné avec la grande dimension du bossage 22.In the embodiment shown in Figs. 1 and 2, the cylindrical envelope 1 having an oval base, the tubes 6, 18 and 8 are aligned on the major axis of this oval. Consequently, the cup 2, which also has an oval shape, has a hole for the passage of the tube 6 which is aligned with the large dimension of the boss 22.

La coupelle 4 est réalisée de la même manière que la coupelle 2 et comporte, comme elle, un bossage 24 arrondi et en saillie vers l'extérieur, ainsi qu'un orifice de passage du tube 8 aligné avec la grande dimension du bossage 24.The cup 4 is produced in the same way as the cup 2 and, like it, has a rounded boss 24 projecting outwards, as well as a passage orifice for the tube 8 aligned with the large dimension of the boss 24.

Dans chacune de ces coupelles 2 ou 4 la profondeur du bossage est relativement importante et la saillie du sommet à l'extérieur de la partie plane correspond sensiblement au rayon du tube 18 ou 8. Par contre, cette coupelle d'extrémité est fixée à l'enveloppe 1, à une distance axiale relativement faible de la coupelle intermédiaire 10, 14, de sorte que la chambre 12, 16 a, autour du bossage 22, une dimension axiale qui est au plus égale au diamètre du tube 6, 18 ou 8, tandis qu'au droit du sommet du bossage sa dimension correspond à celle d'une chambre extrême classique.In each of these cups 2 or 4 the depth of the boss is relatively large and the projection from the top to the outside of the flat part corresponds substantially to the radius of the tube 18 or 8. By cons, this end cup is fixed to the envelope 1, at a relatively small axial distance from the intermediate cup 10, 14, so that the chamber 12, 16 has, around the boss 22, an axial dimension which is at most equal to the diameter of the tube 6, 18 or 8 , while at the right of the top of the boss its dimension corresponds to that of a classic extreme chamber.

Dans un tel silencieux les gaz d'échappement pénétrant par le tube 6 changent de direction, d'une part dans la chambre 12 entre les extrémités des tubes 6 et 18 et la paroi du bossage 24, et d'autre part dans la chambre 16 entre les extrémités des tubes 18 et 8 et la paroi du bossage 22. La forme des bossages 22 et 24 est telle que ces portions des chambres 12 et 16 forment pratiquement une continuation des tubes 6 ou 18 dans lesquels, grâce à l'absence de toute paroi de guidage entre les tubes et le bossage, le changement de direction des gaz s'effectue sans rencontre brutale de ceux-ci avec la paroi et avec un freinage minimal. En conséquence, on constate qu'il n'est plus nécessaire de donner aux chambres 12 et 16 un volume important et que les coupelles 2 et 4 peuvent être montées beaucoup plus près des coupelles intérieures 10 et 14 que dans les silencieux classiques. Par exemple les coupelles 2 et 4 peuvent être rapprochées d'une distance correspondant à la profondeur du bossage 22 ou 24 et conserver ainsi un volume suffisant pour, en coopération avec la forme particulière du bossage, éviter le freinage du fluide en facilitant son écoulement.In such a silencer the exhaust gases entering through the tube 6 change direction, on the one hand in the chamber 12 between the ends of the tubes 6 and 18 and the wall of the boss 24, and on the other hand in the chamber 16 between the ends of the tubes 18 and 8 and the wall of the boss 22. The shape of the bosses 22 and 24 is such that these portions of the chambers 12 and 16 practically form a continuation of the tubes 6 or 18 in which, thanks to the absence of any guide wall between the tubes and the boss, the direction of the gases is changed without sudden encounter of these with the wall and with minimal braking. Consequently, it can be seen that it is no longer necessary to give the chambers 12 and 16 a large volume and that the cups 2 and 4 can be mounted much closer to the interior cups 10 and 14 than in conventional silencers. For example, the cups 2 and 4 can be brought closer to a distance corresponding to the depth of the boss 22 or 24 and thus keep a sufficient volume to, in cooperation with the particular shape of the boss, prevent braking of the fluid by facilitating its flow.

En conséquence on obtient un silencieux qui, avec un encombrement plus réduit, assure une atténuation efficace des bruits. Par ailleurs la réduction de l'encombrement, c'est-à-dire notamment la réduction de la longueur de l'enveloppe 1, se traduit par une réduction de poids et, par suite, une réduction de prix du silencieux.As a result we obtain a silencer which, with a smaller footprint, ensures effective attenuation of noise. Furthermore, the reduction in size, that is to say in particular the reduction in the length of the casing 1, results in a reduction in weight and, consequently, a reduction in the price of the silencer.

Bien entendu des coupelles selon l'invention peuvent être utilisées sur des silencieux de types divers, par exemple sur des silencieux tels que celui représenté sur la Fig. 3, dont l'enveloppe extérieure 21 est un cylindre à base circulaire. Dans ce cas les trois tubes 6, 18 et 8 ne sont plus alignés et chacune des coupelles d'extrémité 26 comporte un bossage 28, de forme analogue au bossage 22 ou 24, et un trou de passage du tube d'entrée 6, ou de sortie 8, ménagé sur le côté de ce bossage, et de préférence centré sur l'axe médian correspondant à sa plus petite dimension.Of course, cups according to the invention can be used on mufflers of various types, for example on mufflers such as that shown in FIG. 3, the outer envelope 21 of which is a cylinder with a circular base. In this case the three tubes 6, 18 and 8 are no longer aligned and each end cups 26 has a boss 28, similar in shape to boss 22 or 24, and a hole for passage of the inlet tube 6, or outlet 8, formed on the side of this boss, and preferably centered on the median axis corresponding to its smallest dimension.

De la même manière l'invention s'étend aux silencieux comportant un nombre plus grand ou plus petit de tubes. Par exemple la Fig. 4 montre un silencieux qui comporte seulement deux tubes, un tube 30 d'entrée du gaz et un tube 32 de sortie du gaz, fixés tous les deux dans une même coupelle d'extrémité plate 34. Ces deux tubes traversent la longueur de l'enveloppe cylindrique 31 et débouchent dans une chambre fermée par une coupelle d'extrémité 36. Cette coupelle 36 comporte un bossage 38 de guidage et de renversement de l'écoulement du gaz, qui fait saillie à l'extérieur du silencieux et dont la base correspond sensiblement à l'ensemble des deux orifices d'extrémité des tubes. Il est bien évident que si le silencieux devait comporter plus de trois tubes, l'une au moins des coupelles d'extrémité pourrait comporter plusieurs bossages analogues, assurant chacun le guidage de l'écoulement de fluide entre deux tubes successifs.In the same way, the invention extends to silencers comprising a larger or smaller number of tubes. For example, FIG. 4 shows a silencer which comprises only two tubes, a gas inlet tube 30 and a gas outlet tube 32, both fixed in the same flat end cup 34. These two tubes cross the length of the cylindrical casing 31 and open into a chamber closed by an end cup 36. This cup 36 has a boss 38 for guiding and reversing the flow of gas, which projects outside the silencer and the base of which corresponds substantially to the assembly of the two end orifices of the tubes. It is obvious that if the muffler were to have more than three tubes, at least one of the end cups could have several similar bosses, each guiding the flow of fluid between two successive tubes.

Dans tous les cas le silencieux obtenu a un encombrement inférieur à celui d'un silencieux de type classique et, en outre, assure une atténuation des bruits nettement meilleure. Un tel type de silencieux est donc tout particulièrement adapté à la réduction des bruits engendrés par la sortie des gaz d'échappement des véhicules automobiles, dans lesquels la place disponible sous la carrosserie est généralement extrêmement-réduite, mais également dans de nombreuses autres applications en raison notamment de sa grande efficacité et de son coût réduit.In all cases, the silencer obtained has a smaller footprint than that of a conventional silencer and, moreover, provides significantly better noise attenuation. Such a type of muffler is therefore particularly suitable for reducing the noise generated by the exit of exhaust gases from motor vehicles, in which the space available under the bodywork is generally extremely reduced, but also in many other applications. this is mainly due to its high efficiency and reduced cost.

Claims (5)

1. Silencieux de gaz d'échappement de moteur thermique comportant une enveloppe cylindrique extérieure et des tubes de guidage des gaz, reliés entre eux par au moins une chambre extrême délimitée à l'intérieur de l'enveloppe par une coupelle intermédiaire plane de support des tubes et une coupelle d'extrémité, caractérisé en ce que la coupelle d'extrémité (2,4,26,36) comporte, au droit de deux tubes successifs (18,8-6,18-30,32), un bossage (22,24,28,38) arrondi et creux, en saillie vers l'extérieur, dont le sommet est séparé de la coupelle intermédiaire (10,14) par une distance légèrement supérieure au rayon des tubes, tandis que l'épaisseur de la chambre (12,16) autour de ce bossage est inférieure au diamètre de ces tubes, de sorte que le bossage guide le changement de direction de l'écoulement des gaz entre ces tubes.1. A combustion engine exhaust silencer comprising an outer cylindrical envelope and gas guide tubes, interconnected by at least one extreme chamber delimited inside the envelope by a flat intermediate cup for supporting the tubes and an end cup, characterized in that the end cup (2,4,26,36) comprises, in line with two successive tubes (18,8-6,18-30,32), a boss (22,24,28,38) rounded and hollow, projecting outwards, the apex of which is separated from the intermediate cup (10,14) by a distance slightly greater than the radius of the tubes, while the thickness of the chamber (12,16) around this boss is smaller than the diameter of these tubes, so that the boss guides the change in direction of the flow of gases between these tubes. 2. Silencieux suivant la revendication 1, caractérisé en ce que la base du bossage (22,24,28,38) a une petite dimension qui est légèrement supérieure au diamètre de l'un des tubes, tandis que sa grande dimension correspond sensiblement à la distance entre les deux génératrices les plus éloignées des deux tubes successifs.2. Silencer according to claim 1, characterized in that the base of the boss (22,24,28,38) has a small dimension which is slightly greater than the diameter of one of the tubes, while its large dimension corresponds substantially to the distance between the two generators furthest from the two successive tubes. 3. Silencieux suivant l'une des revendications 1 et 2, caractérisé en ce que la coupelle d'extrémité, qui a une forme ovale correspondant à celle de la section de l'enveloppe extérieure (1), comporte un orifice de passage d'un tube d'entrée ou de sortie des gaz (6,8) qui est aligné avec le grand axe de la base du bossage (22).3. Muffler according to one of claims 1 and 2, characterized in that the end cup, which has an oval shape corresponding to that of the section of the outer casing (1), has a passage opening for a gas inlet or outlet tube (6,8) which is aligned with the major axis of the base of the boss (22). 4. Silencieux suivant l'une des revendications 1 et 2, caractérisé en ce que la coupelle (26), qui a une forme circulaire analogue à celle de la section de l'enveloppe extérieure (21), comporte un orifice de passage d'un tube d'entrée ou de sortie des gaz (6,8) qui est situé à côté du bossage (28).4. Muffler according to one of claims 1 and 2, characterized in that the cup (26), which has a circular shape similar to that of the section of the outer casing (21), comprises an orifice for the passage of a gas inlet or outlet tube (6,8) which is located next to the boss (28). 5. Silencieux suivant l'une des revendications 1 à 4, caractérisé en ce qu'il comporte plus de trois tubes et en ce qu'au moins l'une des coupelles d'extrémité comporte plusieurs bossages analogues.5. Muffler according to one of claims 1 to 4, characterized in that it comprises more than three tubes and in that at least one of the end cups has several similar bosses.
EP82400070A 1981-02-02 1982-01-15 Exhaust gas silencer of a heat engine Expired EP0057623B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82400070T ATE20953T1 (en) 1981-02-02 1982-01-15 EXHAUST SILENCER OF A THERMAL ENGINE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8101940A FR2499151B1 (en) 1981-02-02 1981-02-02 CLOSING CUP FOR AUTOMOTIVE EXHAUST MUFFLERS AND MUFFLER COMPRISING SUCH A CUP
FR8101940 1981-02-02

Publications (3)

Publication Number Publication Date
EP0057623A2 true EP0057623A2 (en) 1982-08-11
EP0057623A3 EP0057623A3 (en) 1982-08-25
EP0057623B1 EP0057623B1 (en) 1986-07-23

Family

ID=9254727

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82400070A Expired EP0057623B1 (en) 1981-02-02 1982-01-15 Exhaust gas silencer of a heat engine

Country Status (7)

Country Link
US (1) US4381045A (en)
EP (1) EP0057623B1 (en)
JP (1) JPS57148015A (en)
AT (1) ATE20953T1 (en)
DE (1) DE3272058D1 (en)
ES (1) ES263609Y (en)
FR (1) FR2499151B1 (en)

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GB2198475B (en) * 1986-12-04 1990-09-26 Tenneco Inc Muffler with flow director plates

Also Published As

Publication number Publication date
ATE20953T1 (en) 1986-08-15
EP0057623A3 (en) 1982-08-25
EP0057623B1 (en) 1986-07-23
US4381045A (en) 1983-04-26
FR2499151A1 (en) 1982-08-06
FR2499151B1 (en) 1985-12-13
ES263609Y (en) 1983-06-01
JPS57148015A (en) 1982-09-13
ES263609U (en) 1982-11-01
DE3272058D1 (en) 1986-08-28

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