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EP2851526B1 - Silencieux d'échappement - Google Patents

Silencieux d'échappement Download PDF

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Publication number
EP2851526B1
EP2851526B1 EP14190957.2A EP14190957A EP2851526B1 EP 2851526 B1 EP2851526 B1 EP 2851526B1 EP 14190957 A EP14190957 A EP 14190957A EP 2851526 B1 EP2851526 B1 EP 2851526B1
Authority
EP
European Patent Office
Prior art keywords
housing
perforated
micro
exhaust silencer
silencer according
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
EP14190957.2A
Other languages
German (de)
English (en)
Other versions
EP2851526A1 (fr
Inventor
Bernhard Bachner
Klaus Spindler
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.)
Faurecia Emissions Control Technologies Germany GmbH
Original Assignee
Faurecia Emissions Control Technologies Germany GmbH
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
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Priority claimed from DE2003137111 external-priority patent/DE10337111A1/de
Priority claimed from DE2003137110 external-priority patent/DE10337110A1/de
Application filed by Faurecia Emissions Control Technologies Germany GmbH filed Critical Faurecia Emissions Control Technologies Germany GmbH
Priority claimed from EP08000648A external-priority patent/EP1953354A1/fr
Publication of EP2851526A1 publication Critical patent/EP2851526A1/fr
Application granted granted Critical
Publication of EP2851526B1 publication Critical patent/EP2851526B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/161—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general in systems with fluid flow
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F01N1/082—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling the gases passing through porous members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F01N1/083—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using transversal baffles defining a tortuous path for the gases or successively throttling gas flow
    • 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
    • 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

Definitions

  • the present invention relates to an exhaust silencer for the internal combustion engine of a motor vehicle according to the preamble of claim 1.
  • Such a silencer shows the DE 297 10 491 U1 .
  • Exhaust silencers are well known in different versions. Depending on the principle used for sound attenuation, a differentiation is made here between absorption silencers on the one hand and reflection silencers on the other, frequently combining both functional principles in separate chambers within a single exhaust silencer in order to achieve broadband damping.
  • Conventional absorption silencers in this case comprise at least one absorption chamber filled with a fibrous sound-absorbing material, the absorption chamber generally being coupled to the exhaust gas flow via a perforated wall, in particular a perforated pipe.
  • the present invention is directed to an exhaust muffler of the type specified, which, although it has the advantages of conventional absorption muffler in particular with regard to the damping characteristic, manages without fibrous Schallschluckstoff.
  • the silencer according to the invention is free of any fibrous Schallschluckstoff.
  • the present invention takes advantage of the finding that micro-perforated material is suitable for effective sound attenuation in the case of the use of a suitable material under the conditions prevailing in exhaust systems of internal combustion engines, which are characterized in particular by high flow velocities, high pulsations and high temperatures.
  • a micro-perforated flat material in the context of the present invention such a perforated sheet material is considered, the pore size is a maximum of 2.0 mm 2 .
  • Preferred pore sizes are between 0.15 mm 2 and 1.5 mm 2 .
  • the degree of perforation was found to be from 1 to 3% and the equivalent hole diameter from 0.4 to 1.5 mm.
  • the micro-perforated flat material used in the context of the present invention consists of a metallic material, aluminum in particular, namely AL99.5H24, and heat-resistant stainless steel, namely 1.4301 or 1.4828, being considered.
  • the housing at least one radial, between the inside of the housing and the lateral surface of the tube extending intermediate bottom is arranged. The tube with the at least partially perforated wall through the housing.
  • a microperforated flat material with a wall thickness between 0.4 mm and 0.8 mm is particularly preferably used.
  • the microperforated sheet namely such in the form of a microperforated film, to form a multi-layer microperforated wall rests flat against a stiff, perforated support wall and if necessary firmly connected to this.
  • the exhaust silencer according to the invention has at least one intermediate bottom defining two functional chambers, which comprises microperforated flat material. It is particularly advantageous if the respective intermediate floor, with a total thickness of 10 to 20 mm comprises a corrugated or folded microperforated carrier film and two on both sides applied to them microperforated coating films. In this way, limited individual chambers are defined in the space between the two coating films by the corrugated or folded microperforated carrier film, which are coupled by the micro-perforations of the three films to the two adjacent functional chambers.
  • the tube is a corrugated or folded microperforated carrier film and two on both sides applied to this microperforated coating films.
  • the tube should be microperforated essentially over the entire, passing through the housing track and thus sound-absorbing effect over the entire length. At least 90% of the length of the pipe section in the housing is microperforated.
  • the housing extends in accordance with the preferred embodiment substantially concentric with the tube, which has proven to be particularly advantageous.
  • the ratio of the outer diameter of the housing to the outer diameter of the tube, which passes through the housing, is in the range of 2.5 to 4 including, in this context, preferably pipe wall thicknesses between 0.4 to 1.5 mm are provided.
  • At least one radial intermediate space extending between the inside of the housing and the lateral surface of the tube should be arranged in the housing, the ratio of the distance of the end faces of the housing from the distance of the bottom from the end face of the housing closer to 1.8 to 2.2 or from 2.8 to 3.2.
  • the housing at least two spaced-apart radial, are provided between the inner sides of the housing and the lateral surface of the tube extending shelves.
  • the ratio of the distance of the end faces of the housing to the distance of the first intermediate bottom of the nearer end face is in the range of 1.8 to 2.2, and the ratio of the distance of the end faces of the housing to the distance of the second intermediate bottom of the closer him Front side is in the range of 2.8 to 3.2.
  • the ratio of the perforated surface to the total area of the microperforated section Very important for the sound attenuation is the so-called perforation, the ratio of the perforated surface to the total area of the microperforated section.
  • the tube and possibly also the intermediate bottom should have a degree of perforation of 1 to 3%. This ratio has proved to be advantageous.
  • the preferred wall thickness of the tube or shelves in this context should preferably be in the range of 0.4 to 1.5 mm and the equivalent hole diameter between 0.4 and 1.5 mm.
  • At least one functional chamber of the exhaust muffler is lined at least in regions with microperforated flat material.
  • the microperforated flat material can be arranged in particular with a greater or lesser distance from the gas-tight housing wall.
  • At least one functional chamber has a filling of microperforated flat material.
  • the inventive muffler in the frequency range below about 100 Hz compared to conventional absorption mufflers of the same dimensions improved damping behavior.
  • a particularly favorable damping behavior results when the filling of microperforated flat material comprises a plurality of mutually substantially parallel, spaced-apart layers. The distance between the two individual layers of the filling is on the order of between 12 times and 80 times, ideally between 15 times and 40 times the thickness of the microperforated sheet.
  • such a filling, depending on the installation conditions, of a continuous strip of microperforated sheet wound or folded in this case, particularly low production costs arise.
  • the tubes of microperforated sheet material can in particular surround an inner, exhaust-carrying, perforated tube.
  • the damping behavior of the exhaust muffler according to the invention can also be favorably influenced if the microperforated flat material has pores of different shapes and / or different sizes; this contributes to a particularly broadband damping, which makes the exhaust muffler according to the present invention particularly superior to such absorption mufflers according to the prior art.
  • Suitable pore forms include circles, segments, ovals, trapezoids, slits and the like. With regard to the pore sizes, widths of between 0.05 mm and 0.15 mm and lengths of between 0.5 mm and 1.5 mm have proven to be particularly favorable for non-round pores.
  • the in Fig. 1 illustrated muffler comprises a tube 1 and a cylindrical housing 2, which in turn consists of two end floors 3 and 4 and a jacket 5.
  • the housing 2 concentric tube I comprises a
  • the exhaust gas pipe I is coupled to the functional chamber 10, which surrounds the central portion 8 of the exhaust pipe I and by this, the two end floors 3 and 4 and the jacket 5 of the housing is limited.
  • an insert 11 is arranged in the chamber 10. This consists of two concentric spaced-apart tubes 12 and 13 of a microperforated film.
  • the tube 1 in the area within the housing and the tubes 12, 13 may, for. B. be formed from a wound or folded strip of microperforated sheet.
  • the in Fig. 2 illustrated exhaust muffler comprises a housing 14, an exhaust gas inlet pipe 15 and an exhaust gas outlet pipe 16.
  • the interior of the housing 14 is divided by three intermediate floors 17, 18 and 19 in four chambers 20, 21, 22 and 23.
  • the exhaust gas inlet pipe 15 opens into the chamber 23 designed as a Helmholtz chamber. It is also coupled to the chamber 23 via a perforation 24 or a microperforated section.
  • the exhaust gas outlet pipe 16 opens into the chamber 21; via the perforation 25 or the microperforated section, it is further acoustically coupled to the chamber 22.
  • the intermediate floors 17 and 18 are, as illustrated in the detail view, each assembled from three microperforated films by applying microperforated coating films 27 and 28 on both sides to a zigzag-folded, microperforated carrier film 26.
  • a unit comprising a zigzag-folded or corrugated carrier film and a coating film applied thereto may be otherwise As can be deduced from the above explanations, also for lining the housing and / or for application to pipes, eg. As the tubes 1, 12, 13, 15, 16, and / or use gas-impermeable intermediate floors.
  • FIG. 3 an exhaust muffler in the form of a concentric tube resonator.
  • the tube 1 is microperforated over almost the entire distance in the interior of the housing 2 on the entire outer circumference.
  • the microperforated portion of the tube 1 in the interior of the housing 2 is at least 90% of the distance I of the end faces 31, 32 of the housing 2.
  • Inside the housing 2 are two spaced apart, radially extending and between the inside of the housing 2 and the outside the lateral surface of the tube 1 extending shelves 33, 34 are provided. These shelves 33, 34 are fastened on the one hand to the housing 2 and on the other hand to the tube 1. If necessary, the tube 1 has no microperforations in the region of the connection of the intermediate floors 33, 34.
  • the ratio of the distance I of the two end faces 31, 32 to the distance I 1 of the intermediate bottom 33 from the end face 31 which is close to it should be in the range from 1.8 to 2.2.
  • the distance I of the end faces 31, 32 in relation to the distance I 2 of the intermediate wall 34 to the end face 32 should be in the range of 2.8 to 3.2.
  • the ratio of the outer diameter d a of the housing 2 to the outer diameter d i of the tube 1 in the region inside the housing 2 should be in the range of 2.5 to 4.
  • the wall thicknesses of the pipe and the shelves should be in the range of 0.4 to 1.5 mm, the degree of perforation in the range of 1 to 3%. These conditions are, as I said, particularly advantageous.
  • the equivalent hole diameter is in the range of 0.4 to 1.5 mm.
  • the microperforations usually do not give circular but slit or sickle-shaped holes in the wall. The cross-sectional area of these non-circular holes is converted to an equivalent hole diameter.
  • the intermediate floors 33, 34 may be made of microperforated sheet material, similar to FIG. 2 but you do not have to. Even intermediate floors without throughflow already achieve relatively good sound absorption values.
  • the tube 1 in the area inside the housing consists e.g. made of wound flat material, whereby a multiple winding is possible.
  • the microperforated part of the tube 1 may be welded to a non-perforated tube section which protrudes from the housing 2.
  • the shelves 33, 34 may e.g. be attached by crimping or other plastic deformation of the tube 1 and / or the housing 2.
  • a welding or radial clamping connection is of course conceivable.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Exhaust Silencers (AREA)

Claims (13)

  1. Silencieux d'échappement pour le moteur à combustion interne d'un véhicule automobile, comportant un boîtier (2 ; 14) étanche aux gaz présentant une entrée de gaz d'échappement et une sortie de gaz d'échappement et au moins une chambre fonctionnelle (10 ; 20, 21, 22, 23) insonorisante traversée par du gaz et, à l'intérieur du boîtier (2 ; 14), au moins une paroi qui présente des micro-perforations et qui est exposée au flux de gaz d'échappement pulsé,
    au moins un tube transportant du gaz passant à travers le boîtier (2) et étant réalisé au moins par tronçons sous forme de paroi micro-perforée et présentant un degré de perforation (rapport surface ajourée/surface totale) dans la plage de 1 à 3 %,
    caractérisé en ce qu'au moins un fond intermédiaire (33, 34) radial qui s'étend entre le côté intérieur du boîtier (2) et la surface enveloppante du tube (1) est agencé dans le boîtier (2), et
    en ce que le rapport entre la distance (I) des faces frontales (31, 32) du boîtier (2) et la distance (I1, I2) du fond intermédiaire (33, 34) de la face frontale (31, 32) proche de celui-ci est dans la plage de 1,8 à 2,2 ou dans la plage de 2,8 à 3,2.
  2. Silencieux d'échappement selon la revendication 1,
    caractérisé en ce que
    il présente une paroi micro-performée constituée de plusieurs couches, laquelle comporte une paroi de support rigide et ajourée et au moins un matériau plat micro-perforé en appui de manière plane sur celle-ci sous forme de feuille micro-perforée.
  3. Silencieux d'échappement selon l'une des revendications précédentes,
    caractérisé en ce que
    le tube est constitué, au moins par tronçons, d'une feuille support micro-perforée ondulée ou pliée et de deux feuilles de revêtement micro-perforées appliquées des deux côtés sur celle-ci.
  4. Silencieux d'échappement selon l'une des revendications précédentes,
    caractérisé en ce que
    le tube (1) est micro-perforé sensiblement sur pratiquement tout le parcours traversant le boîtier (2).
  5. Silencieux d'échappement selon l'une des revendications précédentes,
    caractérisé en ce que
    le boîtier (2) s'étend sensiblement de manière concentrique par rapport au tube (1).
  6. Silencieux d'échappement selon la revendication 5,
    caractérisé en ce que
    le rapport entre le diamètre extérieur (da) du boîtier (2) et le diamètre extérieur (di) du tube (1) passant à travers le boîtier (2) est compris dans la plage de 2,5 à 4.
  7. Silencieux d'échappement selon l'une des revendications précédentes,
    caractérisé en ce que
    au moins deux fonds intermédiaires (33, 34) radiaux qui sont espacés l'un de l'autre et qui s'étendent entre le côté intérieur du boîtier (2) et la surface enveloppante du tube (1) sont agencés dans le boîtier (2), le rapport entre la distance (I) des faces frontales (31, 32) du boîtier (2) et la distance (I1) d'un fond intermédiaire (33) de la face frontale (31) proche de celui-ci étant dans la plage de 1,8 à 2,2, et le rapport entre la distance (I) des faces frontales (31, 32) du boîtier (2) et la distance (I2) de l'autre fond intermédiaire (34) de la face frontale (32) proche de celui-ci étant dans la plage de 2,5 à 3,2.
  8. Silencieux d'échappement selon l'une des revendications précédentes,
    caractérisé en ce que
    le fond intermédiaire (33, 34) présente un degré de perforation (rapport surface ajourée/surface totale) dans la plage de 1 à 3 %.
  9. Silencieux d'échappement selon l'une des revendications précédentes,
    caractérisé en ce que
    au moins une chambre fonctionnelle (10) est recouverte, au moins par zones, d'un matériau plat micro-perforé ou présente un remplissage (11) en matériau plat micro-perforé.
  10. Silencieux d'échappement selon la revendication 9,
    caractérisé en ce que
    le remplissage (11) en matériau plat micro-perforé comprend plusieurs couches sensiblement parallèles les unes aux autres.
  11. Silencieux d'échappement selon la revendication 10,
    caractérisé en ce que
    la distance entre les couches individuelles est comprise entre 12 fois et 80 fois, de préférence de 15 à 40 fois la valeur de l'épaisseur du matériau plat micro-perforé.
  12. Silencieux d'échappement selon l'une des revendications précédentes,
    caractérisé en ce que
    la paroi est formée par une bande enroulée ou pliée en matériau plat micro-perforé.
  13. Silencieux d'échappement selon l'une des revendications précédentes,
    caractérisé en ce que
    il est prévu plusieurs tubes (12, 13) sensiblement concentriques les uns par rapport aux autres en matériau plat micro-perforé.
EP14190957.2A 2003-08-11 2004-08-11 Silencieux d'échappement Expired - Lifetime EP2851526B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE2003137111 DE10337111A1 (de) 2003-08-11 2003-08-11 Schalldämpfungsvorrichtung für pulsierendes Heißgas
DE2003137110 DE10337110A1 (de) 2003-08-11 2003-08-11 Abgasschalldämpfer
EP08000648A EP1953354A1 (fr) 2003-08-11 2004-08-11 Silencieux d'échappement
EP04019054.8A EP1507071B2 (fr) 2003-08-11 2004-08-11 Silencieux d'échappement

Related Parent Applications (3)

Application Number Title Priority Date Filing Date
EP04019054.8A Division EP1507071B2 (fr) 2003-08-11 2004-08-11 Silencieux d'échappement
EP04019054.8A Division-Into EP1507071B2 (fr) 2003-08-11 2004-08-11 Silencieux d'échappement
EP08000648A Division EP1953354A1 (fr) 2003-08-11 2004-08-11 Silencieux d'échappement

Publications (2)

Publication Number Publication Date
EP2851526A1 EP2851526A1 (fr) 2015-03-25
EP2851526B1 true EP2851526B1 (fr) 2018-05-23

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Application Number Title Priority Date Filing Date
EP14190957.2A Expired - Lifetime EP2851526B1 (fr) 2003-08-11 2004-08-11 Silencieux d'échappement
EP04019054.8A Expired - Lifetime EP1507071B2 (fr) 2003-08-11 2004-08-11 Silencieux d'échappement

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Application Number Title Priority Date Filing Date
EP04019054.8A Expired - Lifetime EP1507071B2 (fr) 2003-08-11 2004-08-11 Silencieux d'échappement

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Publication number Priority date Publication date Assignee Title
DE102005054397C5 (de) * 2005-11-15 2010-02-11 Westa-Holding Gmbh & Co. Kg Rohrschalldämpfer mit Mikroöffnungen
DE102006020155A1 (de) * 2005-12-15 2007-06-21 Friedrich Boysen Gmbh & Co. Kg Abgasanlage für Brennkraftmaschinen
DE102010061994A1 (de) 2010-11-25 2012-05-31 Gardner Denver Deutschland Gmbh Gebläse-Anordnung
US9970340B2 (en) 2013-02-12 2018-05-15 Faurecia Emissions Control Technologies, Usa, Llc Vehicle exhaust system with resonance damping
BR112017004638A2 (pt) * 2014-09-09 2017-12-05 3M Innovative Properties Co dispositivo acústico
CN106368863A (zh) * 2015-07-23 2017-02-01 曼胡默尔有限责任公司 消音器以及包括该消音器的进气系统
CN110800041A (zh) * 2017-06-28 2020-02-14 3M创新有限公司 微穿孔管道
CN110847980A (zh) * 2019-11-19 2020-02-28 上海钟音环保设备有限公司 一种管道多层微穿孔板消声器及其加工方法
WO2023283007A2 (fr) * 2021-06-04 2023-01-12 Berg Daren Suppresseur de bruit d'arme à feu

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WO1999024708A1 (fr) 1997-11-12 1999-05-20 Stankiewicz Gmbh Conduite parcourue par des gaz, a effet d'absorption des sons
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DE20120470U1 (de) 2001-12-18 2003-04-30 Friedrich Boysen GmbH & Co. KG, 72213 Altensteig Schalldämpfungseinrichtung

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EP1507071A1 (fr) 2005-02-16
EP2851526A1 (fr) 2015-03-25
EP1507071B1 (fr) 2016-07-13
EP1507071B8 (fr) 2016-09-21
EP1507071B2 (fr) 2019-10-16

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