DE1077085B - Arrangement for sound absorption of the exhaust system of internal combustion engines in motor vehicles and the like. like - Google Patents

Arrangement for sound absorption of the exhaust system of internal combustion engines in motor vehicles and the like. like

Info

Publication number
DE1077085B
DE1077085B DEB46594A DEB0046594A DE1077085B DE 1077085 B DE1077085 B DE 1077085B DE B46594 A DEB46594 A DE B46594A DE B0046594 A DEB0046594 A DE B0046594A DE 1077085 B DE1077085 B DE 1077085B
Authority
DE
Germany
Prior art keywords
jacket
exhaust system
arrangement
internal combustion
motor vehicles
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.)
Pending
Application number
DEB46594A
Other languages
German (de)
Inventor
Friedrich Boysen
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DEB46594A priority Critical patent/DE1077085B/en
Publication of DE1077085B publication Critical patent/DE1077085B/en
Pending legal-status Critical Current

Links

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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K13/00—Arrangement in connection with combustion air intake or gas exhaust of propulsion units
    • B60K13/04—Arrangement in connection with combustion air intake or gas exhaust of propulsion units concerning exhaust
    • 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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/05—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of air, e.g. by mixing exhaust with air
    • 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
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/02—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a heat exchanger
    • 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
    • F01N2470/24—Concentric tubes or tubes being concentric to housing, e.g. telescopically assembled
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Toxicology (AREA)
  • Exhaust Silencers (AREA)

Description

Anordnung zur Schalldämpfung der Abgasanlage der Verbrennungsmotoren bei Kraftfahrzeugen u. dgl. Die Erfindung betrifft eine Anordnung zur Schalldämpfung der Abgasanlage der Verbrennungsmotoren bei Kraftfahrzeugen u. dgl.Arrangement for soundproofing the exhaust system of the internal combustion engine in motor vehicles and the like. The invention relates to an arrangement for soundproofing the exhaust system of internal combustion engines in motor vehicles and the like.

Es ist bekannt, die Abgasanlagen von Kraftfahrzeugen mit Schallschluckstoff zu umkleiden. Dadurch wird zwar eine gute Dämpfung des Luftschalles erzielt, aber der Körperschall wird nicht wesentlich gemindert.It is known that the exhaust systems of motor vehicles with sound absorbing material to dress up. This achieves good attenuation of the airborne sound, but the structure-borne noise is not significantly reduced.

Zur Kühlung eines gekapselten Verbrennungsmotors in Schienentriebwagen mit Luft ist es zwar auch bekannt, die Luft durch ein über das Dach hinausragendes, verhältnismäßig weites Rohr anzusaugen und nach der Kühlung des Verbrennungsmotors die erwärmte Luft in einem im Ansaugrohr konzentrisch untergebrachten Rohr kleineren Durchmessers, welches seinerseits das Auspuffrohr konzentrisch umgibt, wieder ins Freie zu führen. Durch diese bekannte Anordnung wird wohl eine gute Kühlung des Verbrennungsmotors erreicht, der Körperschall der Abgasanlage des Verbrennungsmotors wird aber nicht wesentlich gedämpft.For cooling an encapsulated internal combustion engine in rail cars with air it is also known to convey the air through a to suck in a relatively wide pipe and after cooling the internal combustion engine the heated air in a smaller pipe that is concentrically housed in the suction pipe Diameter, which in turn concentrically surrounds the exhaust pipe, back into the Free to lead. This known arrangement is a good cooling of the Combustion engine reaches, the structure-borne noise of the exhaust system of the combustion engine but is not significantly attenuated.

Die Erfindung hat zum Ziel, auch den Körperschall in starkem Maße zu dämpfen.The aim of the invention is also to reduce structure-borne noise to a large extent to dampen.

Dies wird gemäß der Erfindung dadurch erreicht, daß zur Minderung des Körperschalls ein an sich bekannter, die Abgasanlage frei umschließender und mit der Fahrzeugkarosserie fest verbundener Mantel zwischen sich und der Abgasanlage ein ruhendes Luftvolumen einschließt.This is achieved according to the invention in that to reduce the structure-borne noise is a known per se, freely enclosing the exhaust system and jacket firmly connected to the vehicle body between itself and the exhaust system includes a resting volume of air.

Durch diese Maßnahme ist die Abgasanlage von dem sie umgebenden Luftraum akustisch getrennt, und der Körperschall kann kaum noch in den Luftraum dringen.As a result of this measure, the exhaust system is separated from the air space surrounding it acoustically separated, and the structure-borne noise can hardly penetrate into the airspace.

Ein besonderer Vorteil der Erfindung ergibt sich, wenn der Mantel als Bestandteil der Karosserie, z. B. als tragender Bauteil derselben, ausgebildet und dadurch organisch in die Karosserieform einbezogen ist. Durch diese Maßnahme können Abschnitte der Karosserie zugleich Abschnitte des Mantels sein.A particular advantage of the invention arises when the jacket as part of the body, e.g. B. as a supporting component of the same formed and is thereby organically incorporated into the body shape. By this measure sections of the body can also be sections of the jacket.

Eine besonders gute Dämpfung wird ferner dadurch erreicht, daß der Mantel aus einem gelochten inneren Mantel und einem von diesem durch Schallschluckstoff getrennten äußeren Mantel besteht. Der Körperschall wird bei dieser Bauform von dem Schallschluckstof gedämpft und kann nicht wesentlich nach außen dringen. Es ist zwar bekannt, das Gehäuse eines Schalldämpfers aus zwei oder mehreren dicht übereinanderliegenden Metallblechen herzustellen, zwischen die schalldämpfender Werkstoff in dünner Schicht gelegt ist.A particularly good damping is also achieved in that the Jacket made of a perforated inner jacket and one of this with sound-absorbing material separate outer sheath. With this design, the structure-borne noise is generated by attenuated by the sound absorbing substance and cannot penetrate significantly to the outside. It Although it is known, the housing of a muffler consists of two or more tightly Produce superimposed metal sheets, between the sound-absorbing Material is laid in a thin layer.

Außerdem ist bekannt, bei einem Schallabschirmer zum Dämpfen des Leerlaufgeräusches eines Verbrennungsmotors das Eingangsrohr zwischen Verbrennungsmotor und Schalldämpfer mit Öffnungen zu versehen und mit einem wellenförmigen Mantel zu umschließen, der außen von einem schallschluckenden Stoff in Form eines Asbestmantels oder von Asbestschnüren umgeben ist. Durch die bekannten Maßnahmen wird aber nicht die gleiche günstige Wirkung erzielt wie durch einen Mantel aus einem gelochten inneren Mantel, einer Schicht aus Schallschluckstoff und einem äußeren Mantel, zumal wenn dieser Mantel die Abgasanlage frei umschließt, also keine akustische Verbindung zwischen der Abgasanlage und dem Mantel besteht.It is also known to use a sound shield to dampen idling noise of an internal combustion engine, the inlet pipe between the internal combustion engine and the muffler to be provided with openings and to enclose with a wave-shaped jacket, the outside of a sound-absorbing material in the form of an asbestos jacket or asbestos cords is surrounded. However, the known measures do not result in the same favorable Effect achieved as if by a jacket made of a perforated inner jacket, a Layer of sound absorbing material and an outer jacket, especially if this jacket is used encloses the exhaust system freely, i.e. no acoustic connection between the exhaust system and the coat consists.

Um den in dem Mantel auftretenden Wärmestau zu beseitigen, kann dieser nach einem weiteren Merkmal der Erfindung an seinem vorderen Ende mit einer Luftzuführung versehen sein. Dadurch wird die zwischen der Abgasanlage und dem Mantel befindliche Abwärme beseitigt und eine Kühlung der Abgasanlage herbeigeführt.In order to eliminate the build-up of heat occurring in the jacket, this can according to a further feature of the invention at its front end with an air supply be provided. This removes the one located between the exhaust system and the jacket Waste heat is eliminated and the exhaust system is cooled.

Um eine bessere Zugänglichkeit für die Abgasanlage zu schaffen, kann der Mantel ganz oder teilweise aufklappbar sein. Dies kommt besonders für solche Abgasanlagen in Frage, deren Teile des öfteren ausgewechselt werden, wie z. B. bei Versuchsfahrzeugen od. dgl.To create better accessibility for the exhaust system, can the coat can be fully or partially opened. This is especially true for those Exhaust systems in question, the parts of which are often replaced, such. B. at Test vehicles or the like.

In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt; und zwar zeigt Abb. 1 die eine Seitenansicht einer Anordnung nach der Erfindung geschnitten, Abb.2 den Grundriß hierzu und Abb. 3 einen Schnitt nach der LinieA-A in Abb. 1. Die Abgasanlage 1 ist an dem Kraftfahrzeug 2 in bekannter Weise gelagert. Sie ist von einem Mantel 3 umschlossen, wobei der Mantel 3 einen fahrzeugeigenen Bauteil bildet. Der Dämpfungsmantel3 ist zweckmäßig als tragender Bauteil ausgebildet und an die Karosserie 4 des Kraftfahrzeuges 2 angeschlossen, wobei er auch einen Teil der, Karosserie bilden kann. Die Blechwand 5 der Karosserie 4 ist über den Fahrzeugboden 6 heruntergezogen und bildet mit diesem zusammen einen Dämpfungskanal 7, in dem sich die Abgasanlage befindet. Der Mantel 3 ist aus einem gelochten inneren Mantel 8 und einem durch Schallschluckstoff 10 getrennten äußeren Mantel 9 zusammengesetzt. Er ist um die Achse 11 klappbar und kann mittels des Verschlusses 12 verriegelt werden. An seinem vorderen Ende ist eine Öffnung 13 angeordnet, durch die hindurch Luft zur Abgasanlage gelangt. Die Abgasanlage 1 ist innerhalb des Mantels 3 freischwebend gelagert, so daß keinerlei schalleitende Berührungspunkte zwischen ihr und dem Mantel vorhanden sind.In the drawing, an embodiment of the invention is shown; namely Fig. 1 shows a side view of an arrangement according to the invention cut, Fig.2 the plan for this and Fig. 3 a section along the line A-A in Fig. 1. The exhaust system 1 is mounted on the motor vehicle 2 in a known manner. It is enclosed by a jacket 3, the jacket 3 being a vehicle's own Component forms. The damping jacket3 is expediently designed as a load-bearing component and connected to the body 4 of the motor vehicle 2, where he also has a Part of the body that can form. The sheet metal wall 5 of the body 4 is pulled down over the vehicle floor 6 and forms one with this Damping channel 7, in which the exhaust system is located. The jacket 3 is made of one perforated inner jacket 8 and a separated by sound absorbing material 10 outer Sheath 9 composed. It can be folded about the axis 11 and can by means of the lock 12 can be locked. At its front end an opening 13 is arranged through through which air reaches the exhaust system. The exhaust system 1 is inside the jacket 3 suspended so that no sound-conducting points of contact between her and the coat are in place.

Der Mantel 3 könnte sich auch lediglich über den Hauptschalldämpfer 14 und/oder den Nachschalldämpfer 15 erstrecken, wobei die Verbindungsleitung 16 gegen Körperschall isoliert ist.The jacket 3 could also only be on the main silencer 14 and / or the rear muffler 15 extend, the connecting line 16 is insulated against structure-borne noise.

Claims (5)

PATENTANSPRÜCHE: 1. Anordnung zur Schalldämpfung der Abgasanlage der Verbrennungsmotoren bei Kraftfahrzeugen u. dgl., dadurch gekennzeichnet, daß zur Minderung des Körperschalls ein an sich bekannter, die Abgasanlage frei umschließender und mit der Fahrzeugkarosserie fest verbundener Mantel zwischen sich und der Abgasanlage ein ruhendes Luftvolumen einschließt. PATENT CLAIMS: 1. Arrangement for soundproofing the exhaust system of Internal combustion engines in motor vehicles and the like, characterized in that for Reduction of structure-borne noise is known per se and freely enclosing the exhaust system and jacket firmly connected to the vehicle body between itself and the exhaust system includes a resting volume of air. 2. Anordnung nach Anspruch 1, dadurch gekennzeichnet, daß der Mantel (3) als Bestandteil der Karosserie (4), z. B. als tragender Bauteil derselben, ausgebildet ist. 2. Arrangement according to claim 1, characterized in that that the jacket (3) as part of the body (4), for. B. as a supporting component the same, is formed. 3. Anordnung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Mantel (3) aus einem gelochten inneren Mantel (8) und einem von diesem durch Schallschluckstoff (10) getrennten äußeren Mantel (9) besteht. 3. Arrangement according to claim 1 or 2, characterized in that that the jacket (3) consists of a perforated inner jacket (8) and one of this through Sound-absorbing material (10) consists of a separate outer jacket (9). 4. Anordnung nach einem der Ansprüche 1 bis 3; dadurch gekennzeichnet, daß der Mantel (3) ganz oder teilweise aufklappbar ist. 4. Arrangement according to any one of claims 1 to 3; characterized in that the jacket (3) wholly or is partially hinged. 5. Anordnung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Mantel (3) an seinem vorderen Ende mit einer Öffnung (13) ins Freie versehen ist. In Betracht gezogene Druckschriften: Deutsche Patentschriften Nr. 841830, 526 321, 721824. 5. Arrangement according to one of claims 1 to 4, characterized in that the jacket (3) is provided at its front end with an opening (13) to the outside. Considered publications: German Patent Nos. 841830, 526 321, 721824.
DEB46594A 1957-10-29 1957-10-29 Arrangement for sound absorption of the exhaust system of internal combustion engines in motor vehicles and the like. like Pending DE1077085B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEB46594A DE1077085B (en) 1957-10-29 1957-10-29 Arrangement for sound absorption of the exhaust system of internal combustion engines in motor vehicles and the like. like

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB46594A DE1077085B (en) 1957-10-29 1957-10-29 Arrangement for sound absorption of the exhaust system of internal combustion engines in motor vehicles and the like. like

Publications (1)

Publication Number Publication Date
DE1077085B true DE1077085B (en) 1960-03-03

Family

ID=6967976

Family Applications (1)

Application Number Title Priority Date Filing Date
DEB46594A Pending DE1077085B (en) 1957-10-29 1957-10-29 Arrangement for sound absorption of the exhaust system of internal combustion engines in motor vehicles and the like. like

Country Status (1)

Country Link
DE (1) DE1077085B (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3810653A (en) * 1970-05-21 1974-05-14 Daimler Benz Ag Motor vehicles equipped with gas cushion
DE3221378A1 (en) * 1982-06-05 1983-12-08 Rheinmetall GmbH, 4000 Düsseldorf Armoured vehicle
DE3409667A1 (en) * 1984-03-16 1985-09-26 Audi AG, 8070 Ingolstadt Rear part of a motor vehicle
DE4032605A1 (en) * 1990-09-19 1992-03-26 Eckard Design Gmbh Electric powered road vehicle - has hollow section running along vehicle to accommodate batteries as central torsion tube
FR2763899A1 (en) * 1997-05-29 1998-12-04 Renault Exhaust system for motor vehicle with internal combustion engine
FR2858356A1 (en) * 2003-08-01 2005-02-04 Robert Denis Joseph Mazenq Exhaust pipe isolating device for vehicle, has isolation gutter fixed by clamping plate to exhaust assembly and including tube, silencer and extinguishing box, where gutter is fixed under plain heated sheets

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE526321C (en) * 1931-06-04 Valentin Van Horn Silencer
DE721824C (en) * 1941-06-13 1942-06-19 Eberspaecher J Sound absorber on the inlet pipe between the engine and the muffler, especially for dampening idle noise
DE841830C (en) * 1941-10-30 1952-06-19 Maybach Motorenbau G M B H Cooling of encapsulated internal combustion engines in rail cars

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE526321C (en) * 1931-06-04 Valentin Van Horn Silencer
DE721824C (en) * 1941-06-13 1942-06-19 Eberspaecher J Sound absorber on the inlet pipe between the engine and the muffler, especially for dampening idle noise
DE841830C (en) * 1941-10-30 1952-06-19 Maybach Motorenbau G M B H Cooling of encapsulated internal combustion engines in rail cars

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3810653A (en) * 1970-05-21 1974-05-14 Daimler Benz Ag Motor vehicles equipped with gas cushion
DE3221378A1 (en) * 1982-06-05 1983-12-08 Rheinmetall GmbH, 4000 Düsseldorf Armoured vehicle
DE3409667A1 (en) * 1984-03-16 1985-09-26 Audi AG, 8070 Ingolstadt Rear part of a motor vehicle
DE4032605A1 (en) * 1990-09-19 1992-03-26 Eckard Design Gmbh Electric powered road vehicle - has hollow section running along vehicle to accommodate batteries as central torsion tube
FR2763899A1 (en) * 1997-05-29 1998-12-04 Renault Exhaust system for motor vehicle with internal combustion engine
FR2858356A1 (en) * 2003-08-01 2005-02-04 Robert Denis Joseph Mazenq Exhaust pipe isolating device for vehicle, has isolation gutter fixed by clamping plate to exhaust assembly and including tube, silencer and extinguishing box, where gutter is fixed under plain heated sheets

Similar Documents

Publication Publication Date Title
DE1576775C3 (en) Internal combustion engine with sound-insulating casing
DE19504223A1 (en) Intake silencer for internal combustion engine
DE2616053A1 (en) INTAKE SILENCER FOR MOTORCYCLES
DE10144972C1 (en) Fluid guidance, in particular in the form of a raw air hose for sucking raw air into an air filter of a motor vehicle
DE4314204C1 (en) Exhaust system for an internal combustion engine of a vehicle
DE1884804U (en) SILENCERS FOR COMBUSTION ENGINES.
DE2547523B2 (en) Internal combustion engine with noise-dampening casing
DE2850816A1 (en) COMBUSTION MACHINE
DE1476543A1 (en) Silencer
DE1476632B2 (en) Resonator muffler
DE3431078A1 (en) DEVICE FOR DAMPING THE INLET NOISE OF COMBUSTION ENGINES
DE1077085B (en) Arrangement for sound absorption of the exhaust system of internal combustion engines in motor vehicles and the like. like
DE2844269C2 (en) Internal combustion engine with sound-absorbing casing
DE3026730C2 (en) Exhaust system with silencer and suspension
DE10360495B4 (en) Intake duct with noise damping
DE3704006C2 (en)
DE60020231T2 (en) AIR INTAKE DEVICE FOR A INTERNAL COMBUSTION ENGINE
DE3707617A1 (en) Intake pipe for an internal combustion engine
DE809497C (en) Muffler for internal combustion engines of motor vehicles
DE2022851C3 (en) Exhaust system for internal combustion engines
DE969092C (en) Soundproofing system consisting of a line with a large volume and main silencer, especially for motorcycles
DE3149632A1 (en) Exhaust silencer for internal combustion engines
DE599977C (en) Sound absorbers, especially for internal combustion engines, with built-in sound-absorbing elements
DE660302C (en) Silencer for internal combustion engines, in which the exhaust gases are passed several times in succession through brushes
DE3149622C2 (en)