EP0391014B1 - Absorption silencer for internal combustion engines, especially for all-terrain vehicles - Google Patents

Absorption silencer for internal combustion engines, especially for all-terrain vehicles Download PDF

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Publication number
EP0391014B1
EP0391014B1 EP89830558A EP89830558A EP0391014B1 EP 0391014 B1 EP0391014 B1 EP 0391014B1 EP 89830558 A EP89830558 A EP 89830558A EP 89830558 A EP89830558 A EP 89830558A EP 0391014 B1 EP0391014 B1 EP 0391014B1
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EP
European Patent Office
Prior art keywords
envelope
silencer
resistant
annular
tube
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.)
Expired - Lifetime
Application number
EP89830558A
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German (de)
French (fr)
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EP0391014A2 (en
EP0391014A3 (en
Inventor
Franco Acerbis
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Acerbis Italia SpA
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Acerbis Italia SpA
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Publication date
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Priority to AT89830558T priority Critical patent/ATE103371T1/en
Publication of EP0391014A2 publication Critical patent/EP0391014A2/en
Publication of EP0391014A3 publication Critical patent/EP0391014A3/en
Application granted granted Critical
Publication of EP0391014B1 publication Critical patent/EP0391014B1/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1861—Construction facilitating manufacture, assembly, or disassembly the assembly using parts formed by casting or moulding
    • 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
    • F01N1/24—Silencing apparatus characterised by method of silencing by using sound-absorbing materials
    • 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
    • F01N13/16—Selection of particular materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1805—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1805—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body
    • F01N13/1827—Sealings specially adapted for exhaust systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1838—Construction facilitating manufacture, assembly, or disassembly characterised by the type of connection between parts of exhaust or silencing apparatus, e.g. between housing and tubes, between tubes and baffles
    • 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
    • F01N2310/00—Selection of sound absorbing or insulating material
    • F01N2310/02—Mineral wool, e.g. glass wool, rock wool, asbestos or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/10—Tubes having non-circular cross section
    • 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
    • F01N2530/00—Selection of materials for tubes, chambers or housings
    • F01N2530/18—Plastics material, e.g. polyester resin

Definitions

  • the present invention relates to an improved absorption silencer for internal combustion engines, in particular for all-terrain vehicles.
  • exhaust systems for motor vehicles essentially consist of an exhaust pipe proper and a silencer, also called an "exhaust pipe”, which is basically intended to reduce noise at exhaust to legal limits.
  • exhaust pipe also called an "exhaust pipe”
  • the shapes and dimensions of both the exhaust pipe and the muffler are decisive, but negatively and negatively affect the performance of the engine itself by preventing the free flow of the burnt gases at the outlet, and this in particular. for two-stroke engines, most often used on all-terrain vehicles.
  • the silencers known today and made up of a metal casing which delimits the expansion chamber of essentially cylindrical shape with a diameter greater than that of the exhaust tube but of limited size are of two types: the first operating by "resonance or reflection”, comprises several chambers inserted in series or in parallel with the gas outlet tube and which acoustically filter out most of the exhaust noise; and the second type operating by “absorption”, comprises a sound-absorbing material, for example rock wool, placed between the perforated exhaust tube and the envelope and which, by its vibration, dissipates the energy of exhaust gas.
  • the object of the present invention is to eliminate the aforementioned drawbacks by providing an absorption type muffler which allows a reduction in both exhaust noise and thermal losses, an increase in its service life and the possibility of replacing only the envelope in the event of rupture.
  • said envelope is made of synthetic thermoplastic material such as nylon or PPS, and the annular seals are made of silicone or viton.
  • the solution proposed by the present invention allows the production of a silencer which reduces the exhaust noise by approximately 4-5 dBA, reduces the dispersion of heat towards the outside and strongly attenuates the vibrations of the envelope which is advantageously achievable by rotational molding and therefore without welding, and which in addition can be mounted on the exhaust tube of removably so that it can be easily and quickly replaced without requiring disassembly or replacement of the exhaust pipe.
  • FIG. 1 shows a front view, partly in section, of an absorption silencer according to the invention
  • FIG. 2 shows a sectional view along line A-A of Fig 1
  • FIG. 3 shows, in section, the detail of the connection between the casing and the exhaust tube of the silencer of FIG. 1.
  • this silencer on the tube as follows.
  • the first part 10 of the casing 1 with the corresponding annular seal 20 mounted in the seat 14, is threaded onto the perforated tube 5 by its rear end and thus slid up to the stop 16 provided at the front end of the tube 5 ; after having filled said part 10 of the envelope with rock wool or similar material, the second part 18, already provided with the annular seal 21, is mounted by threading it onto the rear end of the tube 5, and bringing it close to the first part of the envelope until it is joined to it by interlocking interlocking.
  • at least one radial screw 17 for connection is advantageously provided.

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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)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Characterised By The Charging Evacuation (AREA)
  • Road Paving Structures (AREA)

Abstract

The absorption silencer is for the engine of a cross-country vehicle in particular, having a perforated exhaust tube on which stuffing of heat-resistant and sound-insulating material such as mineral wool is wound. It comprises a casing in sections for assembly together, of heat-resistant material, threaded on and detachably fixed to the tube, with the stuffing in between. These are secured by front and rear annular joints, of heat-resistant and partly elastic material, and which seal the saing so that the exhaust gas cannot escape.

Description

La présente invention concerne un silencieux à absorption perfectionné pour moteurs à explosion, en particulier pour véhicules tout-terrain.The present invention relates to an improved absorption silencer for internal combustion engines, in particular for all-terrain vehicles.

Il est connu que les dispositifs d'échappement pour véhicules motorisés sont essentiellement constitués d'un tube d'échappement proprement dit et d'un silencieux, appelé également "pot d'échappement", et qui est fondamentalement destiné à abaisser le bruit à l'échappement jusqu'aux limites légales. Dans ce but, les formes et les dimensions aussi bien du tube d'échappement que du silencieux sont déterminantes, mais influent négativement et pesamment sur les performances du moteur lui-même en empêchant le libre écoulement des gaz brûlés en sortie, et cela en particulier pour les moteurs à deux temps, utilisés le plus souvents sur les véhicules tous terrains.It is known that exhaust systems for motor vehicles essentially consist of an exhaust pipe proper and a silencer, also called an "exhaust pipe", which is basically intended to reduce noise at exhaust to legal limits. For this purpose, the shapes and dimensions of both the exhaust pipe and the muffler are decisive, but negatively and negatively affect the performance of the engine itself by preventing the free flow of the burnt gases at the outlet, and this in particular. for two-stroke engines, most often used on all-terrain vehicles.

Il est connu que les silencieux connus aujourd'hui et constitués d'une enveloppe métallique qui délimite la chambre d'expansion de forme essentiellement cylindrique avec un diamètre supérieur à celui du tube d'échappement mais d'encombrement limité, sont de deux types: le premier fonctionnant par "résonance ou réflexion", comprend plusieurs chambres insérées en série ou en parallèle avec le tube de sortie des gaz et qui filtrent d'un point de vue acoustique la plus grande partie du bruit d'échappement; et le deuxième type fonctionnant par "absorption", comprend un matériau insonorisant, par exemple de la laine de roche, placé entre le tube perforé d'échappement et l'enveloppe et qui, de par sa vibration, dissipe en chaleur l'énergie des gaz d'échappement.It is known that the silencers known today and made up of a metal casing which delimits the expansion chamber of essentially cylindrical shape with a diameter greater than that of the exhaust tube but of limited size, are of two types: the first operating by "resonance or reflection", comprises several chambers inserted in series or in parallel with the gas outlet tube and which acoustically filter out most of the exhaust noise; and the second type operating by "absorption", comprises a sound-absorbing material, for example rock wool, placed between the perforated exhaust tube and the envelope and which, by its vibration, dissipates the energy of exhaust gas.

Ces silencieux connus à ce jour présentent la caractéristique commune consistant en ce que l'enveloppe est réalisée en métal en une ou plusieurs parties fixées ensemble, au moyen de soudures, et ce fait entraîne une série d'inconvénients non négligeables; en effet, si l'on tient compte des performances élevées exigées du moteur, les sollicitations imposées au dispositif d'échappement sont lourdes et la transmission de la chaleur et des vibrations directement au silencieux provoquent une perte thermique, une usure rapide et favorise la rupture de l'enveloppe au niveau des soudures. A chaque fois qu'une rupture d'un composant survient, il est nécessaire de remplacer le système d'échappement tout entier et cela entraîne une dépense importante. Par ailleurs, il se trouve que les limites légales actuelles du bruit produit par les gaz d'échappement sur les véhicules motorisés, en particulier ceux de compétition et de tout-terrain, rendent ces silencieux inadaptés aux exigences aussi bien techniques qu'économiques.These silencers known to date have the common characteristic that the casing is made of metal in one or more parts fixed together, by means of welds, and this fact leads to a series of significant drawbacks; in fact, if the high performance required of the engine is taken into account, the stresses imposed on the exhaust system are heavy and the transmission of heat and vibrations directly to the silencer cause thermal loss, rapid wear and promotes breakage. of the envelope at the welds. Whenever a component failure occurs, it is necessary to replace the entire exhaust system and this results in significant expense. In addition, it turns out that the current legal limits of noise produced by exhaust gases on motor vehicles, in particular those of competition and off-road, make these silencers unsuited to the requirements as well technical as economic.

On connaît, d'après le document US - A - 4 239 091 un silencieux à absorption comprenant une enveloppe à plusieurs éléments destinée à être enfilée et fixée sur le tube perforé d'échappement au moyen d'étaux et de vis et en coopération de deux garnitures d'étanchéité l'une antérieure et l'autre postérieure.Document US-A-4 239 091 discloses an absorption silencer comprising a casing with several elements intended to be threaded and fixed to the perforated exhaust tube by means of clamps and screws and in cooperation with two seals, one anterior and the other posterior.

Mais ce silencieux connu ne permet pas un montage ou démontage manuel rapide, sûr et fiable sans utilisation d'aucun outil.However, this known silencer does not allow rapid, safe and reliable manual assembly or disassembly without the use of any tool.

La présente invention a pour but d'éliminer les inconvénients précités en réalisant un silencieux du type à absorption qui permette une réduction aussi bien du bruit d'échappement que des pertes thermiques, une augmentation de sa durée de vie et la possibilité de ne remplacer que l'enveloppe en cas de rupture.The object of the present invention is to eliminate the aforementioned drawbacks by providing an absorption type muffler which allows a reduction in both exhaust noise and thermal losses, an increase in its service life and the possibility of replacing only the envelope in the event of rupture.

Ce résultat a été atteint conformément à l'invention en réalisant un silencieux à absorption ayant les caracteristiques prévues dans la revendication 1.This result was achieved in accordance with the invention by producing an absorption silencer having the characteristics provided in claim 1.

Avantageusement, ladite enveloppe est réalisée en matériau thermoplastique synthétique tel que du nylon ou du PPS, et les joints annulaires sont réalisés en silicone ou en viton.Advantageously, said envelope is made of synthetic thermoplastic material such as nylon or PPS, and the annular seals are made of silicone or viton.

La solution proposée par la présente invention permet la réalisation d'un silencieux qui réduit le bruit d'échappement d'environ 4-5 dBA, diminue la dispersion de la chaleur vers l'extérieur et atténue fortement les vibrations de l'enveloppe qui est avantageusement réalisable par moulage rotationnel et de ce fait sans soudures, et qui en outre peut être monté sur le tube d'échappement de manière amovible de sorte qu'il peut être facilement et rapidement remplacé sans nécessiter le démontage ni le remplacement du tube d'échappement.The solution proposed by the present invention allows the production of a silencer which reduces the exhaust noise by approximately 4-5 dBA, reduces the dispersion of heat towards the outside and strongly attenuates the vibrations of the envelope which is advantageously achievable by rotational molding and therefore without welding, and which in addition can be mounted on the exhaust tube of removably so that it can be easily and quickly replaced without requiring disassembly or replacement of the exhaust pipe.

Ces avantages et caractéristiques ainsi que d'autres seront plus et mieux compris de chaque homme du métier à la lumière de la description qui va suivre et à l'aide des dessins annexés donnés à titre d'exemplification pratique de l'invention, mais à ne pas considérer dans le sens limitatif; dessins sur lesquels: la FIG. 1 représente une vue de face, en partie en coupe, d'un silencieux à absorption conformément à l'invention; la FIG. 2 représente une vue en coupe suivant la ligne A-A de la Fig 1; la FIG. 3 représente, en coupe, le détail de la connexion entre l'enveloppe et le tube d'échappement du silencieux de la Fig. 1.These advantages and characteristics as well as others will be more and better understood by each person skilled in the art in the light of the description which will follow and with the aid of the appended drawings given by way of practical example of the invention, but to do not consider in the limiting sense; drawings in which: FIG. 1 shows a front view, partly in section, of an absorption silencer according to the invention; FIG. 2 shows a sectional view along line A-A of Fig 1; FIG. 3 shows, in section, the detail of the connection between the casing and the exhaust tube of the silencer of FIG. 1.

Réduit à sa structure essentielle et en référence aux dessins annexés, un silencieux à absorption pour moteur à explosion, en particulier pour véhicules tout-terrain, conformément à l'invention, comprend:

  • une enveloppe 1 constituée d'une première partie 10 et d'une deuxième partie 18, la première 10 de forme essentiellement cylindrique avec deux ailettes supérieures 16 de fixation au cadre ou châssis du véhicule et avec l'extrémité antérieure 11 présentant une section réduite pour former un siège annulaire interne 14 de diamètre légèrement supérieur à celui du tube d'échappement 5, et avec l'extrémité postérieure 17 pourvue d'une gorge annulaire externe 19, et l'autre partie 18 de forme essentiellement cylindrique, avec l'extrémité postérieure pourvue d'un siège annulaire interne 12 de diamètre légèrement supérieur à celui du tube d'échappement 5 et dont l'extrémité antérieure est emboîtable par encastrement et avec forçage élastique sur l'extrémité postérieure 17 de la première partie 10; lesdites parties 10 et 18 de l'enveloppe 1 étant réalisées en matériau thermoplastique tel que du nylon ou du PPS selon le procédé du moulage rotationnel;
  • deux joints annulaires 20, 21 pourvus, sur leur surface extérieure, d'une gorge annulaire 22, 23 de section correspondant respectivement à celle desdits sièges annulaires 14 et 12 et qui sont destinés à relier de manière amovible et partiellement élastique ladite enveloppe 1 avec ledit tube 5 en correspondance des deux extrémités de l'enveloppe 1; lesdits joints étant réalisés en matériau thermorésistant et partiellement élastique tel que du silicone ou du viton; en correspondance du joint antérieur 20, le tube 5 est avantageusement pourvu d'un anneau élastique 50 en métal avec une butée 51 d'arrêt pour ledit joint 20;
  • un rembourrage 13 en matériau insonorisant et thermorésistant, telle que de la laine de verre ou de roche, enroulée autour du tube perforé d'échappement 5.
Reduced to its essential structure and with reference to the accompanying drawings, an absorption silencer for an internal combustion engine, in particular for all-terrain vehicles, in accordance with the invention, comprises:
  • an envelope 1 consisting of a first part 10 and a second part 18, the first 10 of essentially cylindrical shape with two upper fins 16 for fixing to the frame or chassis of the vehicle and with the front end 11 having a reduced section for form an internal annular seat 14 with a diameter slightly greater than that of the exhaust tube 5, and with the rear end 17 provided with an external annular groove 19, and the other part 18 of essentially cylindrical shape, with the rear end provided with an internal annular seat 12 of diameter slightly greater than that of the exhaust tube 5 and the front end of which is nestable by embedding and with elastic forcing on the rear end 17 of the first part 10; said parts 10 and 18 of the envelope 1 being made of thermoplastic material such as nylon or PPS according to the method of rotational molding;
  • two annular seals 20, 21 provided, on their outer surface, with an annular groove 22, 23 of section corresponding respectively to that of said annular seats 14 and 12 and which are intended to connect in a removable and partially elastic manner said casing 1 with said tube 5 corresponding to the two ends of the envelope 1; said seals being made of heat-resistant and partially elastic material such as silicone or viton; in correspondence with the front seal 20, the tube 5 is advantageously provided with an elastic ring 50 made of metal with a stop 51 for stopping said seal 20;
  • padding 13 made of sound-absorbing and heat-resistant material, such as glass or rock wool, wrapped around the perforated exhaust tube 5.

Le montage de ce silencieux sur le tube d'echappement s'effectue de la manière suivante. La première partie 10 de l'enveloppe 1 avec le joint annulaire correspondant 20 monté dans le siège 14, est enfilé sur le tube perforé 5 par son extrémité postérieure et glissé ainsi jusqu'à la butée 16 prévue à l'extrémité antérieure du tube 5; après avoir rempli ladite partie 10 de l'enveloppe avec la laine de roche ou matériau similaire, on monte la deuxième partie 18 déjà pourvue du joint annulaire 21 en l'enfilant sur l'extrémité postérieure du tube 5, et en l'approchant de la première partie de l'enveloppe jusqu'à l'unir à celle-ci par emboîtement à encastrement. Pour assurer la stabilité de l'union des deux parties de l'enveloppe, au-moins une vis radiale 17 de liaison est avantageusement prévue.The mounting of this silencer on the tube as follows. The first part 10 of the casing 1 with the corresponding annular seal 20 mounted in the seat 14, is threaded onto the perforated tube 5 by its rear end and thus slid up to the stop 16 provided at the front end of the tube 5 ; after having filled said part 10 of the envelope with rock wool or similar material, the second part 18, already provided with the annular seal 21, is mounted by threading it onto the rear end of the tube 5, and bringing it close to the first part of the envelope until it is joined to it by interlocking interlocking. To ensure the stability of the union of the two parts of the envelope, at least one radial screw 17 for connection is advantageously provided.

Claims (3)

  1. Absorption silencer for internal combustion engines, particularly for cross-country vehicles, consisting of a perforated exhaust pipe (5) on which a filling (13) of thermally-resistant and soundproof material is wound and an envelope (1), where this envelope consists of two parts (10, 18) and made of a thermally-resistant material and intended to be fixed on the exhaust pipe (5) with interposition of the said sound-proofing material (3) by means of two annular joints (20, 21), one at the front (20) and the other at the rear (21), of a thermally-resistant and partially elastic material and also suitable for ensuring the leak-tightness of the envelope (1) to the exhaust gas, characterized by the fact that the said parts (10, 18) of the envelope can be assembled end to end by rigid fixing, where the said annular joints (20, 21) are provided with an annular throat (22, 23) corresponding to the annular seat (14, 12) of the parts (10, 18) of the envelope (1) and where the exhaust pipe (5), corresponding to the front joint (20) is provided with an elastic ring (50) of metal with a stop (51).
  2. Silencer in accordance with Claim 1, characterized by the fact that the said annular joints (20, 21) are made in a single part of silicone or viton.
  3. Silencer in accordance with part 1, characterized by the fact that the said two parts (10, 18) of the envelope (1) are made of synthetic thermoplastic material such as nylon or PPS according to the rotational moulding process.
EP89830558A 1989-04-07 1989-12-20 Absorption silencer for internal combustion engines, especially for all-terrain vehicles Expired - Lifetime EP0391014B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89830558T ATE103371T1 (en) 1989-04-07 1989-12-20 ABSORPTION SILENCER FOR ENGINE ENGINES, ESPECIALLY FOR OFF-ROAD VEHICLES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT939589 1989-04-07
IT8909395A IT1233289B (en) 1989-04-07 1989-04-07 ABSORPTION SILENCER FOR COMBUSTION ENGINES, IN PARTICULAR FOR OFF-ROAD VEHICLES

Publications (3)

Publication Number Publication Date
EP0391014A2 EP0391014A2 (en) 1990-10-10
EP0391014A3 EP0391014A3 (en) 1990-12-05
EP0391014B1 true EP0391014B1 (en) 1994-03-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP89830558A Expired - Lifetime EP0391014B1 (en) 1989-04-07 1989-12-20 Absorption silencer for internal combustion engines, especially for all-terrain vehicles

Country Status (6)

Country Link
US (1) US5033580A (en)
EP (1) EP0391014B1 (en)
AT (1) ATE103371T1 (en)
DE (1) DE68914139T2 (en)
ES (1) ES2054093T3 (en)
IT (1) IT1233289B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999027238A1 (en) * 1997-11-21 1999-06-03 Skone James, Robert, Edmund Silencer
US7325652B2 (en) * 2001-11-06 2008-02-05 Ocv Intellectual Capital, Llc Bumper/muffler assembly
US7510050B2 (en) * 2004-01-27 2009-03-31 Emler Don R Vehicle exhaust systems
US7934580B2 (en) * 2006-04-12 2011-05-03 Ocv Intellectual Capital, Llc Long fiber thermoplastic composite muffler system
US7942237B2 (en) * 2006-04-12 2011-05-17 Ocv Intellectual Capital, Llc Long fiber thermoplastic composite muffler system with integrated reflective chamber
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Also Published As

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ES2054093T3 (en) 1994-08-01
IT8909395A0 (en) 1989-04-07
IT1233289B (en) 1992-03-26
ATE103371T1 (en) 1994-04-15
US5033580A (en) 1991-07-23
DE68914139T2 (en) 1994-11-03
EP0391014A2 (en) 1990-10-10
DE68914139D1 (en) 1994-04-28
EP0391014A3 (en) 1990-12-05

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