EP0337877A1 - Silencer for internal-combustion engines - Google Patents

Silencer for internal-combustion engines Download PDF

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Publication number
EP0337877A1
EP0337877A1 EP89400996A EP89400996A EP0337877A1 EP 0337877 A1 EP0337877 A1 EP 0337877A1 EP 89400996 A EP89400996 A EP 89400996A EP 89400996 A EP89400996 A EP 89400996A EP 0337877 A1 EP0337877 A1 EP 0337877A1
Authority
EP
European Patent Office
Prior art keywords
shells
internal
silencer
composite material
circuit
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
EP89400996A
Other languages
German (de)
French (fr)
Other versions
EP0337877B1 (en
Inventor
Pierre Roubinet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Renault SAS
Regie Nationale des Usines Renault
Original Assignee
Renault SAS
Regie Nationale des Usines Renault
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Publication of EP0337877A1 publication Critical patent/EP0337877A1/en
Application granted granted Critical
Publication of EP0337877B1 publication Critical patent/EP0337877B1/en
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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
    • F01N13/1872—Construction facilitating manufacture, assembly, or disassembly the assembly using stamp-formed parts or otherwise deformed sheet-metal
    • F01N13/1877—Construction facilitating manufacture, assembly, or disassembly the assembly using stamp-formed parts or otherwise deformed sheet-metal the channels or tubes thereof being made integrally with the housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F01N13/0097—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
    • 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
    • F01N13/1861—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
    • 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
    • F01N13/14—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 thermal insulation
    • 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
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/24—Methods or apparatus for fitting, inserting or repairing different elements by bolts, screws, rivets 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
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/30—Removable or rechangeable blocks or cartridges, e.g. for filters
    • 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
    • F01N2470/02—Tubes being perforated
    • 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
    • F01N2530/20—Plastics material, e.g. polyester resin reinforced with mineral or metallic fibres
    • 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
    • F01N2530/26—Multi-layered walls

Definitions

  • the present invention relates to a silencer for an internal combustion engine consisting of an internal gas channeling circuit housed in an outer casing.
  • the present invention relates to a new design of exhaust silencers and to the development of new composite materials having good heat resistance.
  • the design of the silencer provides good thermal insulation so that the temperature of the enclosure remains limited.
  • the design of the enclosure provides good thermal insulation which allows the internal circuit to rise faster and higher in temperature (therefore less condensate) and good sound insulation.
  • the silencer according to the invention is characterized in that the gas circuit includes insulating flanges which are housed in the half-shells and partitions which are supported on the half-shells made of composite material and having on the outside cooling ribs.
  • the silencer has an internal gas circuit consisting of a metal tube 1 forming a baffle and two partitions 2. This circuit is made of steel protected against internal corrosion. It is integral with two insulating flanges 3 made of refractory material placed on the two ends of the tube 1.
  • This circuit is wrapped in an external envelope formed by two half-shells 4 of composite material in the form of glass-polyester prepreg or glass-phenolic prepreg. Insulating shims 5 made of refractory cardboard are placed in the half-shells 4 in line with the partitions 2.
  • the assembly is carried out in such a way that the half-shells 4 are not in direct contact with the metallic central circuit, as indicated in FIG. 2 which is a longitudinal half-section of the assembled silencer.
  • Two metal rings 6 fixed on the tube 1 make it possible to correctly position the insulating washers 3.
  • the flanges 3 engage in grooves housed in the caps 41 of the half-shells.
  • the flanges 3 have an outwardly curved shape, which makes it possible to lengthen the distance between the connections on the hot tube 1 (inlet and outlet) which are outside the envelope.
  • Washers 9 made of refractory fibers can be placed inside the steel flanges 3 so as to reduce heat exchanges with the hot gases circulating inside the silencer.
  • the two half-shells are assembled together by screws, collars or rivets 7 with the interposition of a silicone seal 8 as shown in Figure 3 which is a half cross-section in the assembly area.
  • the assembly elements of the two half-shells can come from molding. For example, these assembly elements can act by clipping.
  • the half-shells 4 can be compression molded, by placing on the press punch a cloth of verranne and a blank of prepreg.
  • Closing the press ensures complete filling of the mold, including the imprints of the ribs arranged in the die.
  • the molds are heated to a constant temperature between 100 and 200 ° C (150 ° C in the present example), the polymerization is thus carried out between one and two minutes depending on the thickness of the part to be molded and the reactivity of the resin used.
  • the half-shells thus molded have the particularity of presenting on their internal face a layer of unimpregnated verranne fabric 14 (see FIG. 4) forming a certain thermal insulation, and of presenting on their external face cooling ribs 42 obtained from molding .
  • the insulation of the internal face can be increased by the presence of a layer of glass wool or rock as it already exists in many metallic silencers to attenuate the sound emission.
  • the internal insulation layer may be missing.
  • the polyester resin constituting the main part of the matrix is calcined on a small thickness of the internal face of the envelope.
  • the glass fiber thus exposed remains in place, thus forming an insulating layer which stops the progression of the calcination of the matrix. It is therefore sufficient to provide the ablative allowance at the time of design.
  • the shell is made with a composite material comprising glass fibers, pulverulent fillers and an organic matrix.
  • the arrangement and distribution of the constituents is such that heat exchanges are favored towards the outside and reduced towards the inside so that the temperature of the shell does not exceed 200 ° C.
  • the prepreg is made with an impregnation paste and it comprises 27% glass by weight in the form of rovings cut to 25 and / or 50 mm in length, and this prepreg can be easily manufactured using the machine described in patent 74/12176 of the applicant.
  • the prepreg intended for molding the half-shells is manufactured on the same machine as previously but by incorporating hollow glass microspheres in the impregnation paste supplying the upper coating, while the lower coating is supplied with a dough without microspheres.
  • microspheres for example those corresponding to the reference B37 / 2000 of the company 3M, have a particle size greater than 50 ⁇ m and are thus filtered by the sheet of cut glass fibers.
  • microspheres therefore form an insulating layer on top of the prepreg.
  • the molding of the half-shells is thus carried out by placing the face of the prepreg filled with hollow microspheres on the punch side, with or without the interposition of verranne fabric.

Landscapes

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

Abstract

The present invention relates to a silencer for internal-combustion engines, consisting of an internal gas-conducting circuit (1) accommodated in an outer casing (4), characterised in that the gas circuit (1) comprises insulating collars (3) which are seated in the half-shells and partitions (2) which bear on the half-shells produced from composite material, with a refractory material (5) being interposed. <IMAGE>

Description

La présente invention se rapporte à un silencieux pour moteur à explosion constitué par un circuit intérieur de canalisation des gaz logé dans une enveloppe extérieure.The present invention relates to a silencer for an internal combustion engine consisting of an internal gas channeling circuit housed in an outer casing.

Pour réduire le bruit produit par les moteurs à explosion, notamment ceux des véhicules automobiles, il est de pratique courante de placer des silencieux dans les circuits des gaz d'échappement.To reduce the noise produced by internal combustion engines, particularly those of motor vehicles, it is common practice to place silencers in the exhaust gas circuits.

Ces silencieux sont réalisés en tôle d'acier et subissent des corrosions internes (condensats acides) et externes (projection d'eau, de boue et de sel).These silencers are made of sheet steel and undergo internal (acidic condensate) and external (water, mud and salt spray) corrosion.

La solution consistant à remplacer tout ou partie de l'acier ordinaire par de l'acier inoxydable est onéreuse.The solution consisting in replacing all or part of the ordinary steel by stainless steel is expensive.

La présente invention se rapporte à une nouvelle conception des silencieux d'échappement et à la mise au point de nouveaux matériaux composites présentant une bonne tenue à la chaleur. La conception du silencieux assure une bonne isolation thermique de sorte que la température de l'enveloppe reste limitée. La conception de l'enveloppe apporte une bonne isolation thermique qui permet au circuit interne de monter plus rapidement et plus haut en température (donc moins de condensats) et une bonne isolation phonique..The present invention relates to a new design of exhaust silencers and to the development of new composite materials having good heat resistance. The design of the silencer provides good thermal insulation so that the temperature of the enclosure remains limited. The design of the enclosure provides good thermal insulation which allows the internal circuit to rise faster and higher in temperature (therefore less condensate) and good sound insulation.

Le silencieux selon l'invention est caractérisé par le fait que le circuit des gaz comprend des collerettes isolantes qui se logent dans les demi-coquilles et des cloisons qui s'appuient sur les demi-coquilles réalisées en matériau composite et présentant sur l'extérieur des nervures de refroidissement.The silencer according to the invention is characterized in that the gas circuit includes insulating flanges which are housed in the half-shells and partitions which are supported on the half-shells made of composite material and having on the outside cooling ribs.

L' invention va maintenant être décrite avec plus de détails en se référant à un mode de réalisation donné à titre d'exemple et représenté par les dessins annexés sur lesquels :

  • - La figure 1 représente une vue éclatée d'un silencieux selon l'invention,
  • - La figure 2 est une demi-coupe longitudinale d'un silencieux assemblé,
  • - La figure 3 est une demi-coupe transversale du même silencieux,
  • - La figure 4 est une vue de détail d'une demi-coquille,
  • - La figure 5 est une variante de montage des collerettes.
The invention will now be described in more detail with reference to an embodiment given by way of example and represented by the appended drawings in which:
  • FIG. 1 represents an exploded view of a silencer according to the invention,
  • - Figure 2 is a longitudinal half-section of an assembled silencer,
  • - Figure 3 is a half cross-section of the same silencer,
  • FIG. 4 is a detailed view of a half-shell,
  • - Figure 5 is an alternative mounting of the flanges.

En se référant à la figure 1, le silencieux comporte un circuit des gaz interne constitué d'un tube métallique 1 formant chicane et de deux cloisons 2. Ce circuit est en acier protégé contre la corrosion interne. Il est solidaire de deux collerettes isolantes 3 en matériau réfractaire placées sur les deux extrémités du tube 1.Referring to Figure 1, the silencer has an internal gas circuit consisting of a metal tube 1 forming a baffle and two partitions 2. This circuit is made of steel protected against internal corrosion. It is integral with two insulating flanges 3 made of refractory material placed on the two ends of the tube 1.

Ce circuit est enveloppé dans une enveloppe externe formée de deux demi-coquilles 4 en matériau composite sous forme de préimprégné verre-polyester ou de préimprégné verre-phénolique. Des cales isolantes 5 en carton réfractaire sont placées dans les demi-coquilles 4 au droit des cloisons 2.This circuit is wrapped in an external envelope formed by two half-shells 4 of composite material in the form of glass-polyester prepreg or glass-phenolic prepreg. Insulating shims 5 made of refractory cardboard are placed in the half-shells 4 in line with the partitions 2.

L' assemblage est réalisé de telle façon que les demi-coquilles 4 ne soient pas en contact direct avec le circuit central métallique, comme l'indique la figure 2 qui est une demi-coupe longitudinale du silencieux assemblé.The assembly is carried out in such a way that the half-shells 4 are not in direct contact with the metallic central circuit, as indicated in FIG. 2 which is a longitudinal half-section of the assembled silencer.

Deux bagues métalliques 6 fixées sur le tube 1 (par soudage, brasage ou sertissage) permettent de positionner correctement les rondelles isolantes 3. Les collerettes 3 s'engagent dans des rainures logées dans les chapeaux 41 des demi-coquilles. Dans la variante de la figure 5, les collerettes 3 ont une forme galbée vers l'extérieur, ce qui permet d'allonger la distance entre les liaisons sur le tube chaud 1 (entrée et sortie) qui sont à l'extérieur de l'enveloppe. Des rondelles 9 en fibres réfractaires peuvent être disposées à l'intérieur des collerettes en acier 3 de manière à réduire les échanges thermiques avec les gaz chauds circulant à l'intérieur du silencieux.Two metal rings 6 fixed on the tube 1 (by welding, soldering or crimping) make it possible to correctly position the insulating washers 3. The flanges 3 engage in grooves housed in the caps 41 of the half-shells. In the variant of FIG. 5, the flanges 3 have an outwardly curved shape, which makes it possible to lengthen the distance between the connections on the hot tube 1 (inlet and outlet) which are outside the envelope. Washers 9 made of refractory fibers can be placed inside the steel flanges 3 so as to reduce heat exchanges with the hot gases circulating inside the silencer.

Les deux demi-coquilles sont assemblées entre elles par des vis, colliers ou rivets 7 avec interposition d'un joint silicone 8 ainsi que le montre la figure 3 qui est une demi-coupe transversale dans la zone d'assemblage. Les éléments d'assemblage des deux demi-coquilles peuvent venir de moulage. Par exemple ces éléments d'assemblage peuvent agir par clipsage.The two half-shells are assembled together by screws, collars or rivets 7 with the interposition of a silicone seal 8 as shown in Figure 3 which is a half cross-section in the assembly area. The assembly elements of the two half-shells can come from molding. For example, these assembly elements can act by clipping.

Les demi-coquilles 4 peuvent être moulées par compression, en plaçant sur le poinçon de la presse un tissu de verranne et un flan de préimprégné.The half-shells 4 can be compression molded, by placing on the press punch a cloth of verranne and a blank of prepreg.

La fermeture de la presse assure le remplissage complet du moule, y compris tes empreintes des nervures disposées dans la matrice.Closing the press ensures complete filling of the mold, including the imprints of the ribs arranged in the die.

Les moules sont chauffés à une température constante comprise entre 100 et 200°C (150°C dans le présent exemple), la polymé­risation s'effectue ainsi entre une à deux minutes suivant l'épaisseur de la pièce à mouler et la réactivité de la résine utilisée.The molds are heated to a constant temperature between 100 and 200 ° C (150 ° C in the present example), the polymerization is thus carried out between one and two minutes depending on the thickness of the part to be molded and the reactivity of the resin used.

Les demi-coquilles ainsi moulées ont la particularité de pré­senter sur leur face interne une couche de tissu de verranne non imprégnée 14 (voir figure 4) formant une certaine isolation thermique, et de présenter sur leur face externe des nervures de refroidissement 42 obtenues de moulage.The half-shells thus molded have the particularity of presenting on their internal face a layer of unimpregnated verranne fabric 14 (see FIG. 4) forming a certain thermal insulation, and of presenting on their external face cooling ribs 42 obtained from molding .

L'isolation de la face interne peut être augmentée par la pré­sence d'une couche de laine de verre ou de roche comme cela existe déjà dans beaucoup de silencieux métalliques pour at­ténuer l'émission sonore.The insulation of the internal face can be increased by the presence of a layer of glass wool or rock as it already exists in many metallic silencers to attenuate the sound emission.

La couche d'isolation interne peut être absente. La résine polyester constituant l'essentiel de la matrice se calcine sur une faible épaisseur de la face interne de l'enveloppe. La fibre de verre ainsi mise à nue reste en place en formant ainsi une couche isolante qui stoppe la progression de la calcination de la matrice. Il suffit donc de prévoir la surépaisseur ablative au moment de la conception.The internal insulation layer may be missing. The polyester resin constituting the main part of the matrix is calcined on a small thickness of the internal face of the envelope. The glass fiber thus exposed remains in place, thus forming an insulating layer which stops the progression of the calcination of the matrix. It is therefore sufficient to provide the ablative allowance at the time of design.

La coquille est réalisée avec un matériau composite comportant des fibres de verre, des charges pulvérulentes et une matrice organique. La disposition et la répartition des constituants est telle que les échanges thermiques sont favorisés vers l'ex­térieur et réduits vers l'intérieur afin que la température de la coquille ne dépasse pas 200°C.The shell is made with a composite material comprising glass fibers, pulverulent fillers and an organic matrix. The arrangement and distribution of the constituents is such that heat exchanges are favored towards the outside and reduced towards the inside so that the temperature of the shell does not exceed 200 ° C.

Il est alors possible d'utiliser certaines résines polyester insaturées ou des résines phénoliques.It is then possible to use certain unsaturated polyester resins or phenolic resins.

A titre indicatif, le préimprégné est réalisé avec une pâte d'imprégnation et il comporte 27 % de verre en poids sous forme de stratifils coupés à 25 et/ou 50 mm de longueur, et ce préimprégné peut être facilement fabriqué à l'aide de la machine décrite dans le brevet 74/12176 de la demanderesse.As an indication, the prepreg is made with an impregnation paste and it comprises 27% glass by weight in the form of rovings cut to 25 and / or 50 mm in length, and this prepreg can be easily manufactured using the machine described in patent 74/12176 of the applicant.

La présence de noir de carbone extra-conducteur accroît les conductibilités thermique et électrique, mais il confère à la pâte une thixotropie qui gêne l'imprégnation des fibres de verre au cours de la fabrication du préimprégné.The presence of extra-conductive carbon black increases the thermal and electrical conductivities, but it gives the paste a thixotropy which hinders the impregnation of the glass fibers during the preparation of the prepreg.

Selon une variante le préimprégné destiné au moulage des demi-coquilles est fabriqué sur la même machine que précédemment mais en incorporant des microsphères de verre creuses dans la pâte d'imprégnation alimentant l'enduction supérieure, tandis que l'enduction inférieure est alimentée avec une pâte sans microsphères.According to a variant, the prepreg intended for molding the half-shells is manufactured on the same machine as previously but by incorporating hollow glass microspheres in the impregnation paste supplying the upper coating, while the lower coating is supplied with a dough without microspheres.

Ces microsphères, par exemple celles correspondant à la référence B37/2000 de la Société 3M, ont une granulométrie supérieure à 50 µm et sont ainsi filtrées par la nappe de fibres de verre coupées.These microspheres, for example those corresponding to the reference B37 / 2000 of the company 3M, have a particle size greater than 50 μm and are thus filtered by the sheet of cut glass fibers.

De plus, elles ont une densité apparente inférieure à celle de la résine.In addition, they have an apparent density lower than that of the resin.

Ces microsphères forment donc une couche isolante sur le dessus du préimprégné.These microspheres therefore form an insulating layer on top of the prepreg.

Le moulage des demi-coquilles s'effectue ainsi en plaçant la face du préimprégné garnie de microsphères creuses côté poinçon, avec ou sans interposition de tissu de verranne.The molding of the half-shells is thus carried out by placing the face of the prepreg filled with hollow microspheres on the punch side, with or without the interposition of verranne fabric.

Claims (5)

1 - Silencieux pour moteur à explosion constitué par un cir­cuit (1) intérieur de canalisation des gaz logé dans une en­veloppe extérieure (4), caractérisé par le fait que le cir­cuit (1) des gaz comprend des collerettes isolantes (3) qui se logent dans les demi-coquilles et des cloisons (2) qui s'ap­puient sur les demi-coquilles réalisées en matériau composite avec interposition de matériau réfractaire (5).1 - Muffler for internal combustion engine consisting of a circuit (1) inside the gas pipeline housed in an outer casing (4), characterized in that the circuit (1) of the gases comprises insulating flanges (3) which are housed in the half-shells and partitions (2) which rest on the half-shells made of composite material with the interposition of refractory material (5). 2 - Silencieux selon la revendication 1 caractérisé par le fait que les demi-coquilles (4) présentent sur l'extérieur des ner­vures de refroidissement (42).2 - Muffler according to claim 1 characterized in that the half-shells (4) have on the outside of the cooling ribs (42). 3 - Silencieux selon l'une quelconque des revendications précé­dentes caractérisé par le fait que le matériau composite est constitué des fibres de verre, de charges pulvérulentes et d'une matrice organique.3 - Muffler according to any one of the preceding claims, characterized in that the composite material consists of glass fibers, pulverulent fillers and an organic matrix. 4 - Silencieux selon l'une quelconque des revendications pré­cédentes, caractérisé par le fait que le matériau composite comprend des microsphères de verre.4 - Muffler according to any one of the preceding claims, characterized in that the composite material comprises glass microspheres. 5 - Silencieux selon l'une quelconque des revendications précédentes, caractérisé par le fait que les collerettes (3) sont galbées vers l'extérieur.5 - Muffler according to any one of the preceding claims, characterized in that the flanges (3) are curved outwards.
EP19890400996 1988-04-12 1989-04-11 Silencer for internal-combustion engines Expired - Lifetime EP0337877B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8804810 1988-04-12
FR8804810A FR2629864B1 (en) 1988-04-12 1988-04-12 SILENCER FOR EXPLOSION ENGINES

Publications (2)

Publication Number Publication Date
EP0337877A1 true EP0337877A1 (en) 1989-10-18
EP0337877B1 EP0337877B1 (en) 1992-05-13

Family

ID=9365218

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890400996 Expired - Lifetime EP0337877B1 (en) 1988-04-12 1989-04-11 Silencer for internal-combustion engines

Country Status (4)

Country Link
EP (1) EP0337877B1 (en)
DE (1) DE68901487D1 (en)
ES (1) ES2031374T3 (en)
FR (1) FR2629864B1 (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992008881A1 (en) * 1990-11-09 1992-05-29 Ab Volvo Motor vehicle muffler
EP0563843A1 (en) * 1992-03-31 1993-10-06 MARMITTE ZARA S.p.A. Method for manufacturing mufflers for motor vehicles and mufflers obtained thereby
EP0884456A2 (en) * 1997-06-13 1998-12-16 Jean-Claude Philippron Muffler
EP1253302A1 (en) * 2001-04-27 2002-10-30 J. Eberspächer GmbH Co. KG Exhaust silencer
WO2007120680A1 (en) * 2006-04-12 2007-10-25 Ocv Intellectual Capital, Llc Long fiber thermoplastic composite muffler system with integrated crash management
JP2010513772A (en) * 2006-12-14 2010-04-30 オーシーヴィー インテレクチュアル キャピタル リミテッド ライアビリティ カンパニー Long fiber thermoplastic composite muffler system with integral reflection chamber
DE102010041666A1 (en) * 2010-09-29 2012-05-03 Röchling Automotive AG & Co. KG Exhaust gas guiding device for passenger car, has spring element provided such that radial movement of gas channel is allowed against spring force in region of aperture according to inner edge
EP2639423A1 (en) * 2012-03-15 2013-09-18 J. Eberspächer GmbH & Co. KG Exhaust gas silencer
CN104963745A (en) * 2015-06-01 2015-10-07 上海佛吉亚红湖排气系统有限公司 Automobile silencer damping cotton opening filling technology
WO2022163274A1 (en) * 2021-01-26 2022-08-04 三恵技研工業株式会社 Exhaust structure

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US6668972B2 (en) 2000-11-07 2003-12-30 Owens Corning Fiberglas Technology, Inc. Bumper/muffler assembly
US7934580B2 (en) 2006-04-12 2011-05-03 Ocv Intellectual Capital, Llc Long fiber thermoplastic composite muffler system
CN105332780A (en) * 2015-10-29 2016-02-17 安徽助成信息科技有限公司 Heat insulation cover for exhaust silencer

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US4589516A (en) * 1984-02-20 1986-05-20 Honda Giken Kogyo Kabushiki Kaisha Muffler for internal combustion engines

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DE2323264A1 (en) * 1973-05-09 1974-11-21 Volkswagenwerk Ag EXHAUST SILENCER FOR COMBUSTION MACHINERY
EP0057142A2 (en) * 1981-01-23 1982-08-04 Industeler S.A. Silencer made of corrosion-resisting material for exhaust muffler of motor vehicles
GB2129490A (en) * 1982-10-26 1984-05-16 Alan William Richards Corrosion resistant exhaust silencers
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Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992008881A1 (en) * 1990-11-09 1992-05-29 Ab Volvo Motor vehicle muffler
US5332873A (en) * 1990-11-09 1994-07-26 Ab Volvo Motor vehicle muffler
EP0563843A1 (en) * 1992-03-31 1993-10-06 MARMITTE ZARA S.p.A. Method for manufacturing mufflers for motor vehicles and mufflers obtained thereby
EP0884456A2 (en) * 1997-06-13 1998-12-16 Jean-Claude Philippron Muffler
EP0884456A3 (en) * 1997-06-13 1999-06-16 Jean-Claude Philippron Muffler
EP1253302A1 (en) * 2001-04-27 2002-10-30 J. Eberspächer GmbH Co. KG Exhaust silencer
WO2007120680A1 (en) * 2006-04-12 2007-10-25 Ocv Intellectual Capital, Llc Long fiber thermoplastic composite muffler system with integrated crash management
JP2009533601A (en) * 2006-04-12 2009-09-17 オーシーヴィー インテレクチュアル キャピタル リミテッド ライアビリティ カンパニー Long fiber thermoplastic composite muffler system with integrated collision management
US7730996B2 (en) 2006-04-12 2010-06-08 Ocv Intellectual Capital, Llc Long fiber thermoplastic composite muffler system with integrated crash management
JP2010513772A (en) * 2006-12-14 2010-04-30 オーシーヴィー インテレクチュアル キャピタル リミテッド ライアビリティ カンパニー Long fiber thermoplastic composite muffler system with integral reflection chamber
DE102010041666A1 (en) * 2010-09-29 2012-05-03 Röchling Automotive AG & Co. KG Exhaust gas guiding device for passenger car, has spring element provided such that radial movement of gas channel is allowed against spring force in region of aperture according to inner edge
EP2639423A1 (en) * 2012-03-15 2013-09-18 J. Eberspächer GmbH & Co. KG Exhaust gas silencer
DE102012204114A1 (en) * 2012-03-15 2013-09-19 Eberspächer Exhaust Technology GmbH & Co. KG Muffler unit
JP2013194736A (en) * 2012-03-15 2013-09-30 Eberspaecher Exhaust Technology Gmbh & Co Kg Muffler
CN103410597A (en) * 2012-03-15 2013-11-27 J·埃贝斯佩歇合资公司 Muffler unit
US8939254B2 (en) 2012-03-15 2015-01-27 Eberspächer Exhaust Technology GmbH & Co. KG Muffler unit
DE102012204114B4 (en) * 2012-03-15 2015-03-26 Eberspächer Exhaust Technology GmbH & Co. KG Muffler unit
EP2639423B1 (en) 2012-03-15 2016-06-22 Eberspächer Exhaust Technology GmbH & Co. KG Exhaust gas silencer
CN103410597B (en) * 2012-03-15 2016-12-28 埃贝斯佩歇废气技术合资公司 Muffler unit and the gas extraction system for motor vehicles
CN104963745A (en) * 2015-06-01 2015-10-07 上海佛吉亚红湖排气系统有限公司 Automobile silencer damping cotton opening filling technology
CN104963745B (en) * 2015-06-01 2018-02-06 上海佛吉亚红湖排气系统有限公司 A kind of automotive muffler noise elimination cotton fills opening process
WO2022163274A1 (en) * 2021-01-26 2022-08-04 三恵技研工業株式会社 Exhaust structure
JP7453736B2 (en) 2021-01-26 2024-03-21 三恵技研工業株式会社 exhaust structure

Also Published As

Publication number Publication date
FR2629864A1 (en) 1989-10-13
DE68901487D1 (en) 1992-06-17
EP0337877B1 (en) 1992-05-13
ES2031374T3 (en) 1992-12-01
FR2629864B1 (en) 1991-03-01

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