EP1500798B1 - Silencieux et ligne d'échappement - Google Patents

Silencieux et ligne d'échappement Download PDF

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Publication number
EP1500798B1
EP1500798B1 EP04015174.8A EP04015174A EP1500798B1 EP 1500798 B1 EP1500798 B1 EP 1500798B1 EP 04015174 A EP04015174 A EP 04015174A EP 1500798 B1 EP1500798 B1 EP 1500798B1
Authority
EP
European Patent Office
Prior art keywords
exhaust pipe
resonant element
silencer
resonator
sound absorber
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.)
Active
Application number
EP04015174.8A
Other languages
German (de)
English (en)
Other versions
EP1500798A1 (fr
Inventor
Rolf Dr. Jebasinki
Thomas Tauschek
Marco Jess
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.)
Eberspaecher Exhaust Technology GmbH and Co KG
Original Assignee
Eberspaecher Exhaust Technology GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eberspaecher Exhaust Technology GmbH and Co KG filed Critical Eberspaecher Exhaust Technology GmbH and Co KG
Publication of EP1500798A1 publication Critical patent/EP1500798A1/fr
Application granted granted Critical
Publication of EP1500798B1 publication Critical patent/EP1500798B1/fr
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Anticipated expiration legal-status Critical

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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
    • F01N13/1838—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
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/003—Silencing apparatus characterised by method of silencing by using dead chambers communicating with gas flow passages
    • F01N1/006—Silencing apparatus characterised by method of silencing by using dead chambers communicating with gas flow passages comprising at least one perforated tube extending from inlet to outlet of the silencer
    • 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
    • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
    • F01N1/04—Silencing apparatus characterised by method of silencing by using resonance having sound-absorbing materials in resonance chambers
    • 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
    • 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
    • F01N2310/00—Selection of sound absorbing or insulating material
    • F01N2310/04—Metallic wool, e.g. steel wool, copper wool 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
    • F01N2470/02—Tubes being perforated
    • F01N2470/04—Tubes being perforated characterised by shape, disposition or dimensions of apertures
    • 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

Definitions

  • the invention relates to a silencer according to the preamble of claim 1 for an exhaust system of a motor vehicle. Furthermore, the invention relates to an exhaust system for a motor vehicle, with a silencer according to the invention.
  • the pressure pulses produced in the exhaust gas by the combustion process in the internal combustion engine lead in the exhaust gas flow flowing through the exhaust system to the formation of sound waves in different frequency ranges.
  • silencers in particular the audible for human hearing frequencies are to be damped.
  • the sound waves are transmitted from the exhaust system to the body or the chassis of the vehicle and this stimulates to vibrate.
  • GB 403651 A discloses a muffler having a central perforated tube partially surrounded by a resonator body.
  • a muffler for an exhaust system of a motor vehicle is known in the sound waves of different frequency ranges be damped by the combination of a resonator with a sound absorber, which are arranged in a common muffler housing.
  • the resonator in this case is a branched off from the exhaust pipe resonator tube, which communicates with the exhaust pipe in flow communication.
  • the sound absorber which is intended to dampen the high-frequency sound waves, is arranged at a distance from the resonator tube in the silencer housing and likewise communicates with the exhaust pipe in fluid communication.
  • a disadvantage of this known muffler is in particular that the muffler due to the combination of the resonator tube with the sound absorber has a large volume compared with conventional mufflers.
  • the invention solves the problem by a muffler with the features of claim 1. Furthermore, the invention solves the problem by an exhaust system according to claim 11, which is equipped with a muffler according to the invention.
  • both the exhaust pipe itself and the sound absorber are used as functional elements of the resonator simultaneously, thus forming part of the resonator.
  • a tubular resonator body is used, which is in flow communication with the exhaust pipe, the exhaust pipe circumferentially surrounds at the same time, but spaced from the exhaust pipe while the sound absorber is at least partially inserted into the open end of the resonator.
  • the gas volume in the resonator with which the low-frequency components of the sound waves are to be damped is thus limited by the inner surface of the resonance body, the outer surface of the section enclosed by the resonator body of the exhaust pipe and the outer surface of the inserted into the sound box sound absorber.
  • the resonant body is in a particularly preferred embodiment of the invention silencer at its open end expanded so that viewed in a plane transverse to the longitudinal direction of the resonator in the plane of the Inner surface of the resonator and the outer surface of the sound absorber limited flow cross-section corresponds at least approximately to the flow cross section, which is bounded by the inner surface of the resonator and the outer surface of the exhaust pipe in a parallel second plane.
  • the resonance body may be fixed with its end opposite the open end to the outer surface of the exhaust pipe.
  • the distance of the inner surface of the resonator to the outer surface of the exhaust pipe in the circumferential direction of the exhaust pipe viewed at least approximately constant in order to avoid unwanted turbulence in the resonator, which could possibly lead to the formation of audible flow noise.
  • the distance of the inner surface of the resonator to the outer surface of the exhaust pipe is preferably at least partially constant viewed in the longitudinal direction of the resonator.
  • the exhaust pipe and the resonance body preferably has an at least approximately circular cross-section, wherein the tubular resonance body is arranged concentrically to the exhaust pipe.
  • the exhaust pipe in cross section, for example, oval.
  • the cross section of the resonance body should be adapted to the cross section of the exhaust pipe and arranged symmetrically to the exhaust pipe.
  • the sound absorber is designed in a particularly preferred embodiment of the muffler according to the invention so that the sound absorber completely surrounds the exhaust pipe in the circumferential direction, wherein the sound absorber is attached to the exhaust pipe at the same time.
  • a sound absorber having a slid onto the exhaust pipe absorber housing, which is at least approximately gas-tight with the exhaust pipe in flow connection interior relative to the muffler housing, and with a damping material, such as mineral wool, steel wool and the like , is filled for sound absorption.
  • a sound absorber designed in this way has the advantage, in particular in production, that the sound absorber can be pushed onto the exhaust pipe as a prefabricated assembled unit and subsequently firmly connected to it, for example by welding.
  • absorber housing in this development preferably a tube piece enclosing the exhaust pipe is used, which is closed at its ends and fastened to the exhaust pipe.
  • a plurality of openings are preferably formed on the exhaust pipe through which exhaust gases between the exhaust pipe and the resonator or the sound absorber can flow back and forth, wherein by providing a plurality of openings instead of a single opening the exhaust pipe is hardly affected in its rigidity.
  • the openings are particularly preferably formed as slots which extend in the longitudinal direction of the exhaust pipe.
  • the sum of the surface areas of the flow-through surfaces of the openings in the exhaust pipe in fluid communication with the resonance body should correspond approximately to 0.8 to 1 times the flow cross-section viewed in a plane transverse to the longitudinal direction of the resonance body, that of the inner surface of the resonance body and the outer surface of the exhaust pipe is limited to ensure that the entire volume of gas in the resonator is vibrated and a sufficiently high damping effect is ensured.
  • the sum of the flow cross-sections of the openings is less than 0.8 times the flow cross-section of the resonator, if, for example, for reasons of production technology or reasons of insufficient rigidity of the exhaust pipe, the size and number of openings is limited ,
  • each elevation should preferably correspond to half the distance between the remaining between the inner surface of the resonator and the outer surface of the sound absorber gap into which the elevation protrudes.
  • the invention relates to an exhaust system for a motor vehicle, which is equipped with a silencer according to the invention.
  • Fig. 1 is a schematic sectional view of an inventive muffler 10 is shown for an exhaust system in a motor vehicle.
  • the muffler 10 is conventionally either connected via flanges to the piping of the exhaust system or already integrated directly into the exhaust system.
  • the muffler 10 has a muffler housing 12, which has a hollow cylindrical shape in the illustrated embodiment.
  • the muffler housing 12 is closed at its two open ends in each case by a cover 14 or 16.
  • a hollow-cylindrical exhaust pipe 18 which is passed through formed on the two covers 14 and 16 openings 20 and 22 in the longitudinal direction of the muffler housing 12.
  • the exhaust pipe 18 is gas-tight welded to the two covers 14 and 16 of the muffler housing 12.
  • a resonance body 24 of a resonator 26 is arranged concentrically around the exhaust pipe 18.
  • the likewise formed as a tube resonating body 24 is with its one open end on the inside of in Fig. 1 attached left cover 14, extends in the longitudinal direction of the muffler housing 12 and terminates at a small distance in front of the inside of the second cover 16, so that the other end of the tubular resonance body 24 remains open.
  • the resonator 24 has a cylindrical portion 28 which merges into a flared cylindrical portion 30, which forms about 3/4 of the length of the resonator 24.
  • a sound absorber 32 is disposed in the flared portion 30 of the sound box 24, in the flared portion 30 of the sound box 24, a sound absorber 32 is disposed.
  • the sound absorber 32 has an absorber housing 34, which is formed as a tube piece enclosing the exhaust pipe 18, which is closed at its ends and connected in a gas-tight manner to the exhaust pipe 18.
  • a damping material 36 such as rock wool, steel wool and the like, recorded, with the guided into the absorber housing 34 medium and high-frequency sound waves can be converted by friction into heat and damped in this way.
  • the radial elevations 38 are each dimensioned in their length so that they correspond to approximately half the gap height between the inner surface of the resonator 24 and the outer surface of the sound absorber 32. They are intended to prevent the resonating body 24 vibrating during damping from colliding with the inside of the silencer housing 12.
  • a plurality of extending in the longitudinal direction of the exhaust pipe 18 slots 40 and 42 are formed on the exhaust pipe.
  • the slots 40 are in fluid communication with the volume of gas bounded by the inner surface of the sound box 24, the outer surface of the exhaust pipe 18, and the outer surface of the sound absorber 32.
  • the slots 42 connect the exhaust pipe 18 to the interior of the sealed to the outside absorber housing 30.
  • FIGS. 2 and 3 are cuts along in the Fig. 1 shown section lines II-II and III-III shown. It shows Fig. 2 the section II-II through the exhaust pipe 18 and the unexpanded portion 28 of the resonator 24, while Fig. 3 the section III-III through the resonator body 24, the sound absorber 32 and the exhaust pipe 18 shows.
  • the volume of the resonator 26 is limited in the region of the unexpanded portion 28 of the resonator 24 through the inner surface of the resonator 24 and the outer surface of the exhaust pipe 18 and defines in this sectional plane has a flow cross-section A 1 over the entire length of not expanded portion 28 is approximately constant.
  • the volume of the resonator 26 in the region of the widened portion 30 of the resonator 24 is limited by the inner surface of the resonator 24 and the outer surface of the sound absorber 32 and defined in FIG this sectional plane has a flow cross section A 2 . Again, the flow cross-section A 2 remains approximately constant over the length of the widened portion 30.
  • the radial distance of the aluminum surface of the exhaust pipe 18 to the inner surface resonating body 24 in the unexpanded portion 28 of the resonator 24 and the radial distance of the outer surface of the sound absorber 32 to the inner surface of the resonator 24 each chosen so that the two flow cross-sections A 1 and A 2 correspond to each other at least approximately.
  • the number of slots 40 which connect the exhaust pipe 18 and the resonator 26 with each other, and their flow cross sections are again chosen so that they at least 0.8 to 1 times, preferably 0.9 times, the flow cross section A 1 and A 2 , which ensures that a sufficient volume flow of the exhaust gas can communicate with the resting in the resonator 24 gas column for vibration damping.
  • an exhaust gas stream flows through the exhaust pipe 18, in which in particular due to the pulsed operation of the internal combustion engine resulting pressure pulses or sound waves propagate.
  • the exhaust gas flow communicates with the gas column resting in the resonator 26, the sound waves acting in the exhaust gas stream exciting the gas column in the resonator 26 to oscillate.
  • the vibrating gas column in turn stimulates the resonance body 24 to vibrate, which dampens due to its mass and its material properties low-frequency components of the resulting vibrations, so that in low-frequency sound waves are attenuated in the exhaust stream.
  • the sound waves present in the exhaust gas stream penetrate into the sound absorber 32 via the slots 42. In particular, the energy of medium and high frequency sound waves due to friction in the Damping material is converted into heat. Subsequently, the sound-damped exhaust gas stream flows out of the muffler 10.

Landscapes

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

Claims (11)

  1. Silencieux pour une installation de gaz d'échappement d'un véhicule automobile, comprenant un boîtier de silencieux (12) à travers lequel est guidé un tuyau d'échappement (18) pour le guidage de flux de gaz d'échappement à rendre silencieux, le tuyau d'échappement (18) étant en liaison fluidique avec un résonateur (26) disposé dans le boîtier de silencieux (12) ainsi qu'avec un absorbeur de son (32) disposé dans le boîtier de silencieux (12) et rempli d'un matériau d'amortissement pour l'absorption du son, un corps de résonance (24) de forme tubulaire, entourant le tuyau d'échappement (18) dans sa direction périphérique et disposé à distance du tuyau d'échappement (18) servant de résonateur (26), l'absorbeur de son (32) étant introduit au moins en partie dans l'extrémité ouverte du corps de résonance,
    caractérisé en ce que
    le corps de résonance (24) est élargi à son extrémité ouverte de telle sorte que, considéré dans un plan transversal à la direction longitudinale du corps de résonance (24), la section transversale d'écoulement (A2) limitée dans le plan par la surface interne du corps de résonance (24) et par la surface externe de l'absorbeur de son (32) corresponde au moins approximativement à la section transversale d'écoulement (A) qui est limitée par la surface intérieure du corps de résonance (24) et par la surface extérieure du tuyau d'échappement (18), considéré dans un deuxième plan parallèle.
  2. Silencieux selon la revendication 1, caractérisé en ce que le corps de résonance (24) est fixé avec son autre extrémité au côté intérieur du boîtier de silencieux (12) ou à la surface extérieure du tuyau d'échappement (18).
  3. Silencieux selon la revendication 1 ou 2, caractérisé en ce que la distance de la surface intérieure du corps de résonance (24) à la surface extérieure du tuyau d'échappement (18), considérée dans la direction périphérique d'échappement (18), est au moins approximativement constante, la distance, considérée de préférence également dans la direction longitudinale du corps de résonance (24), étant au moins en partie constante.
  4. Silencieux selon la revendication 1, 2 ou 3, caractérisé en ce que le tuyau d'échappement (18) et le corps de résonance (24) présentent une section transversale au moins approximativement circulaire et le corps de résonance de forme tubulaire (24) est disposé concentriquement par rapport au tuyau d'échappement (18).
  5. Silencieux selon l'une quelconque des revendications 1 à 4, caractérisé en ce que l'absorbeur de son (32) entoure complètement le tuyau d'échappement (18) dans sa direction périphérique et est fixé à celui-ci.
  6. Silencieux selon l'une quelconque des revendications 1 à 5, caractérisé en ce que l'absorbeur de son (32) présente un boîtier d'absorbeur (34) poussé sur le tuyau d'échappement (18), dont l'espace intérieur en liaison fluidique avec le tuyau d'échappement (18) est au moins approximativement étanche aux gaz par rapport au boîtier de silencieux (12), et qui est rempli d'un matériau d'amortissement (36) pour absorber les sons.
  7. Silencieux selon la revendication 6, caractérisé en ce que le boîtier d'absorbeur (34) est une pièce tubulaire entourant le tuyau d'échappement (18) qui est fermée au niveau de ses extrémités et qui est fixée au tuyau d'échappement (18).
  8. Silencieux selon l'une quelconque des revendications 1 à 7, caractérisé en ce que le corps de résonance (24) et/ou l'absorbeur de son (32) sont en liaison fluidique avec le tuyau d'échappement (18) par le biais de plusieurs ouvertures, de préférence des fentes (40, 42).
  9. Silencieux selon la revendication 8, caractérisé en ce que la somme des sections transversales d'écoulement des ouvertures (40) au niveau du tuyau d'échappement (18), en liaison fluidique avec le corps de résonance (24) correspond à 0,8 à 1 fois la section transversale d'écoulement (A1, A2), considérée dans un plan transversalement à la direction longitudinale du corps de résonance (24), qui est limitée par la surface intérieure du corps de résonance (24) et la surface extérieure du tuyau d'échappement (18).
  10. Silencieux selon l'une quelconque des revendications précédentes, caractérisé en ce qu'au niveau ou à proximité de l'extrémité ouverte du corps de résonance (24) sont prévus des rehaussements (38) saillant radialement vers l'intérieur, la hauteur de chaque rehaussement (38) correspondant de préférence à la moitié de la distance de la fente subsistant entre la surface intérieure du corps de résonance (24) et la surface extérieure de l'absorbeur de son (32), dans laquelle pénètre le rehaussement (38).
  11. Installation de gaz d'échappement pour un véhicule automobile comprenant un silencieux (10) selon l'une quelconque des revendications 1 à 10.
EP04015174.8A 2003-07-24 2004-06-29 Silencieux et ligne d'échappement Active EP1500798B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2003133645 DE10333645A1 (de) 2003-07-24 2003-07-24 Schalldämpfer sowie Abgasanlage
DE10333645 2003-07-24

Publications (2)

Publication Number Publication Date
EP1500798A1 EP1500798A1 (fr) 2005-01-26
EP1500798B1 true EP1500798B1 (fr) 2016-09-28

Family

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Application Number Title Priority Date Filing Date
EP04015174.8A Active EP1500798B1 (fr) 2003-07-24 2004-06-29 Silencieux et ligne d'échappement

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EP (1) EP1500798B1 (fr)
DE (1) DE10333645A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011100083A2 (fr) * 2010-02-11 2011-08-18 Faurecia Emissions Control Technologies, Usa, Llc Silencieux en plastique à chambre helmholtz
DE102011114351A1 (de) * 2011-09-27 2014-06-12 Mann + Hummel Gmbh Abgasschalldämpfer
FR3011617B1 (fr) * 2013-10-03 2015-10-23 Poujoulat Dispositif attenuateur de bruit pour un conduit d'evacuation de fumee equipant une chaudiere
CN107327650A (zh) * 2017-08-01 2017-11-07 北京市劳动保护科学研究所 一种管道消声器及具有该消声器的管道系统

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB403651A (en) * 1931-06-20 1933-12-20 Burgess Lab Inc C F Silencer for gaseous currents
US2115103A (en) * 1936-12-21 1938-04-26 Buffalo Pressed Steel Company Muffler
DE1114105B (de) * 1957-12-16 1961-09-21 Diehl K G Gleiskette fuer Fahrzeuge, insbesondere gummigelagerte Gleiskette
GB1522999A (en) * 1975-12-20 1978-08-31 Saab Scania Ab Silencers for damping sound waves in gases
DE3509033C2 (de) * 1985-03-13 1994-05-05 Mueller Bbm Gmbh Schalldämpfer
DE8806069U1 (fr) * 1988-05-06 1988-06-30 Roth-Technik Gmbh, 7560 Gaggenau, De
JPH09144986A (ja) * 1995-11-27 1997-06-03 Nissan Motor Co Ltd 吸音ダクト構造体
DE29607010U1 (de) 1996-04-18 1997-08-14 Gillet Heinrich Gmbh Schalldämpfer

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DE10333645A1 (de) 2005-02-24
EP1500798A1 (fr) 2005-01-26

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