EP3587754B1 - Sound absorber - Google Patents

Sound absorber Download PDF

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Publication number
EP3587754B1
EP3587754B1 EP19181245.2A EP19181245A EP3587754B1 EP 3587754 B1 EP3587754 B1 EP 3587754B1 EP 19181245 A EP19181245 A EP 19181245A EP 3587754 B1 EP3587754 B1 EP 3587754B1
Authority
EP
European Patent Office
Prior art keywords
inner panel
pipe
muffler
panel
accordance
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
EP19181245.2A
Other languages
German (de)
French (fr)
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EP3587754A1 (en
Inventor
Hervé Ferront
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
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Publication of EP3587754A1 publication Critical patent/EP3587754A1/en
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Publication of EP3587754B1 publication Critical patent/EP3587754B1/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
    • 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
    • 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
    • F01N1/026—Annular resonance chambers arranged concentrically to an exhaust passage and communicating with it, e.g. via at least one opening in the exhaust passage
    • 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
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F01N1/10—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling in combination with sound-absorbing materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/007—Apparatus used as intake or exhaust 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
    • 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
    • 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
    • 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
    • F01N2470/24—Concentric tubes or tubes being concentric to housing, e.g. telescopically assembled

Definitions

  • the present invention relates to a silencer which can be provided in a vehicle, for example as a rear silencer in an exhaust system of an internal combustion engine.
  • sound damping units also known as "bombs", which comprise an inner pipe carrying exhaust gas, an outer pipe surrounding this and soundproofing material arranged in a space between the inner pipe and the outer pipe.
  • a silencer according to the preamble of claim 1 is from EP 0 475 398 A1 known.
  • a muffling unit is constructed with an inner pipe that is received in an opening of an inner floor and an opening of an outer floor.
  • the inner tube In its length area extending between the inner floor and the outer floor, the inner tube is surrounded by an outer tube, which is carried in its two end areas on the inner tube. Sound damping material is provided in a volume formed between the inner tube and the outer tube.
  • the object of the present invention is to provide a silencer, in particular a rear silencer, for an exhaust system of an internal combustion engine, in which a simplified assembly of the various components or assemblies thereof is made possible.
  • a muffler for an exhaust system of an internal combustion engine according to claim 1.
  • This muffler comprises a muffler housing with a housing jacket elongated in the direction of a housing longitudinal axis and an outer base connected to the housing jacket at both axial end regions of the housing jacket, wherein the housing jacket with the Outer floors delimiting a silencer interior and in the silencer interior at least one inner floor dividing the silencer interior is arranged, further comprising a silencing unit with an exhaust-conducting inner pipe, an outer pipe surrounding the inner pipe and sound insulation material arranged between the inner pipe and the outer pipe, the inner pipe in an opening of an inner floor and an opening of one of the outer floors or a further inner floor is received and the outer tube is firmly connected to the inner floor and one of the outer floors or further inner floor.
  • the outer tube has a radial distance from the inner tube in each of its axial end regions.
  • this silencer constructed according to the invention connects the silencer unit via the outer tube to an inner floor and one of the outer floors or two inner floors penetrated by the inner tube, it is not necessary to implement a direct connection of the outer tube to the inner tube.
  • a firm integration of the soundproofing unit is ensured by the fact that the outer tube is connected to the inner floor and one of the outer floors or further inner floors by welding.
  • an axial shape receiving the outer tube is formed in the inner bottom and one of the outer floors or further inner bottom.
  • the axial formation formed in the inner floor and that in one of the outer floors or further inner bottom formed axial formation are oriented axially away from each other.
  • the opening provided in the inner base is provided in the area of the axial formation formed in the inner base, and / or that the opening provided in one of the outer bases or further inner bases is provided in the area of the axial formation formed in the outer base or further inner base is provided.
  • the opening formed in the inner bottom can be provided on the inner bottom, surrounding a neck which is axially oriented away from the axial formation provided in the inner bottom, and surrounds the inner tube, and / or can on
  • One of the outer floors or further inner floors surrounding the opening formed in the outer floor or further inner floor can be provided with a neck which surrounds the inner tube and is oriented axially away in the direction of the axial formation provided in the outer floor or further inner floor.
  • the neck is oriented axially away in the direction of a respective formation, that is, it is not positioned so as to engage in the interior space provided by the formation, in which interior the outer tube and also the sound insulation material can be positioned to engage, mutual interference of such a neck can, in particular, also occur the sound insulation material can be avoided.
  • a firm connection of the inner tube can be achieved in that the inner tube is firmly connected to the neck provided on the inner floor, preferably by welding, and / or that the inner tube is firmly connected to the neck provided on one of the outer floors or further inner floors, preferably by welding is. Furthermore, it can be provided for a simple structure that the neck provided on the inner bottom and the one on the one the necks provided for the outer bottoms or further inner bottoms are oriented axially away from one another.
  • the outer tube is cylindrical.
  • a plurality of openings penetrating a pipe wall of the inner pipe can be provided in the length region of the inner pipe surrounded by the soundproofing material.
  • the sound insulation material essentially completely fills an intermediate space formed between the outer pipe and the inner pipe.
  • the sound insulation material can comprise fiber material and / or foamed material.
  • the inner floor and / or one of the outer floors or further inner floors can be provided in a simple manner as a shaped sheet metal part with the structure to be provided according to the invention.
  • the invention also relates to an exhaust system comprising a silencer constructed according to the invention.
  • Fig. 1 shows a length range of a muffler for an exhaust system of an internal combustion engine in a simplified longitudinal section.
  • Fig. 1 shows an end region of a muffler, generally designated 10, for an exhaust system of an internal combustion engine in a vehicle.
  • a muffler 10 can be provided as a rear muffler in the end area of the exhaust system.
  • the muffler 10 comprises a muffler housing 12 with, for example, a substantially cylindrical housing jacket 14 that is elongated in the direction of a housing longitudinal axis A. At both axial end regions of the housing jacket 14, the latter is firmly connected to an outer base 16, for example by flanging and / or welding, so that the Housing jacket 14 delimits a housing interior 18 with the two outer bottoms 16.
  • an inner floor 20 is provided in the housing interior 18 at an axial distance from the outer floor 16.
  • the inner bottom 20 divides the Housing interior 18 into several spatial areas, so that in the illustrated embodiment, a chamber 22 is formed between the illustrated outer base 16 and the inner base 20.
  • the inner bottom 20 can have a perforation so that the chamber 20 is open to the remaining area of the housing interior 18 and can thus form a resonator chamber.
  • a sound attenuation unit generally designated by the reference number 24, comprises an exhaust-gas-carrying inner pipe 26 and an essentially cylindrical outer pipe 28 surrounding the inner pipe 26.
  • An intermediate space 30 formed between the inner pipe 26 and the outer pipe 28 is essentially completely filled with sound-absorbing material 32.
  • the sound attenuation unit 24 can be provided for the sound absorber 10 as a preassembled assembly.
  • the inner pipe 26 can be positioned in the outer pipe 28 and the intermediate space 30 formed between them can then be filled with the sound insulation material 32.
  • the sound insulation material 32 can for example be foamed material which is injected into the space 30 after the defined positioning of the inner pipe 26 with respect to the outer pipe 28.
  • the soundproofing material 32 can alternatively also comprise fiber material, which is plugged into the space 30 or, for example, in the form of a fiber mat, can be wrapped around the inner tube 26 before the inner tube 26 is inserted into the outer tube 28 and then, together with the inner tube 26, into the outer tube 28 can be introduced.
  • the outer tube 28 is at a radial distance from the inner tube 26 in its two axial end regions 34, 36, as well as in the intermediate length regions, and in particular is not directly connected to this in any length region.
  • the cohesion of this sound-damping unit 24 is ensured by the sound-damping material 32 arranged between the inner pipe 26 and the outer pipe 28.
  • a perforation with a plurality of openings 35 penetrating a pipe wall 33 is provided in the inner pipe 26.
  • the silencer assembly 24 is arranged between the outer base 16 shown in this figure and the inner base 20 arranged at an axial distance therefrom and held thereon.
  • the outer base 16 has an axial formation 38 which is dimensioned and adapted to the circumferential contour of the outer tube 28 so that its axial end area 34 can be inserted axially into the axial formation 38 or the spatial area formed therein, for example with a slight interference fit .
  • an opening 40 is formed on the outer base 16, which is surrounded by a neck 42 likewise provided on the outer base 16.
  • the dimensions of the opening 40 or the neck 42 can be selected or matched to the outer circumferential contour of the inner tube 26 in its axial end region 44 such that the inner tube 26 is received with a slight interference fit in the opening 40 or in the neck 42, possibly also protrudes slightly outwards beyond the neck 42. Since the neck 42 is oriented axially away from the formation 38 and does not engage in the formation 38 or the interior space provided by it, there is no interaction between the neck 42 and the sound-absorbing material 32 which is positioned so as to engage in the formation.
  • An axial recess 46 is also provided in the inner bottom 20. This is oriented away from the axial recess 38 provided in the outer base 16 and accommodates the axial end region 36 of the outer tube 28 or the part of the sound-absorbing material 32 also provided in this axial end region 36 of the outer tube 28.
  • the axial formation 46 is preferably adapted in terms of shape and dimensioning to the shape or dimensioning of the outer tube 28 in its axial end region 36, so that the outer tube 28 can be received with its axial end region 36 with a slight interference fit in the axial recess 46.
  • an opening 48 receiving or penetrating an end region 49 of the inner tube 26 is provided and is surrounded by a neck 50 formed on the inner base 20 and extending approximately axially.
  • the neck 50 is oriented away from the axial formation 46, that is to say the interior space formed therein, so that here, too, there is no mutual interference with the area of the sound-absorbing material 32 engaging in the axial formation 46.
  • the neck 50 is also oriented away from the outer base 16, so that the neck 42 provided on the outer base 16 and the neck 50 provided on the inner base 20 are oriented away from one another.
  • the various components or assemblies can be held together firmly by material bonding, that is to say, for example, by welding.
  • the inner base 20 is preferably fixed on the housing jacket 14 by a weld 52, for example a circumferential weld seam or a plurality of weld points.
  • the inner tube 26 is fixed in its axial end region 44 by a weld 54, preferably a circumferential weld seam, on the outer base 16, preferably the neck 42 thereof.
  • the inner tube 26 can also be fixed in its other axial end region 49 by a weld 56, preferably again a circumferential weld seam, on the inner base 20, preferably the neck 50 thereof.
  • a weld 56 preferably again a circumferential weld seam
  • the outer tube 28 can be fixed to the outer base 16 by a weld 60, the weld 60 also being a circumferential weld seam or a May comprise a plurality of spaced apart weld points. If the outer tube 28 is fixed in its two axial end regions 34, 36 on the outer base 16 and on the inner base 20 by welding, which also introduces a comparatively rigid connection between these two bases, it can be advantageous due to the different thermal Expansions of the inner tube 26 on the one hand and of the outer tube 28 on the other hand, the inner tube 26 in its end region 49 is not rigidly connected to the inner base 20.
  • the fixed connection of the outer tube 28 to the inner base 20 and / or the outer base 16, each adjacent to the axial formation 38 or 46 formed therein, ensures that the sound-damping unit 24 is held securely in the muffler 10. This can be supported by the fixed connection of the inner tube 26 in at least one of its two end regions 44, 49 to the outer base 16 or the inner base 20.
  • the principles of the present invention can also be used if the sound-damping unit 24 is carried or supported in its two axial end regions or the two axial end regions 34, 36 of the outer tube 28 on two inner floors arranged in the housing interior 18 of the sound absorber 10. is fixed.

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

Description

Die vorliegende Erfindung betrifft einen Schalldämpfer, welcher in einem Fahrzeug beispielsweise als Nachschalldämpfer in einer Abgasanlage einer Brennkraftmaschine vorgesehen sein kann.The present invention relates to a silencer which can be provided in a vehicle, for example as a rear silencer in an exhaust system of an internal combustion engine.

Um den Schallpegel so weit als möglich zu senken, ist es bekannt, auch als "Bomben" bezeichnete Schalldämpfungseinheiten einzusetzen, welche ein abgasführendes Innenrohr, ein dieses umgebendes Außenrohr und in einem Zwischenraum zwischen dem Innenrohr und dem Außenrohr angeordnetes Schalldämmungsmaterial umfassen.In order to reduce the sound level as much as possible, it is known to use sound damping units, also known as "bombs", which comprise an inner pipe carrying exhaust gas, an outer pipe surrounding this and soundproofing material arranged in a space between the inner pipe and the outer pipe.

Ein Schalldämpfer gemäß dem Oberbegriff des Anspruchs 1 ist aus der EP 0 475 398 A1 bekannt. Bei diesem Schalldämpfer ist eine Schalldämpfungseinheit mit einem Innenrohr aufgebaut, das in einer Öffnung eines Innenbodens und einer Öffnung eines Außenbodens aufgenommen ist. In seinem zwischen dem Innenboden und dem Außenboden sich erstreckenden Längenbereich ist das Innenrohr von einem Außenrohr umgeben, das in seinen beiden Endbereichen am Innenrohr getragen ist. In einem zwischen dem Innenrohr und dem Außenrohr gebildeten Volumen ist Schalldämpfungsmaterial vorgesehen.A silencer according to the preamble of claim 1 is from EP 0 475 398 A1 known. In this muffler, a muffling unit is constructed with an inner pipe that is received in an opening of an inner floor and an opening of an outer floor. In its length area extending between the inner floor and the outer floor, the inner tube is surrounded by an outer tube, which is carried in its two end areas on the inner tube. Sound damping material is provided in a volume formed between the inner tube and the outer tube.

Es ist die Aufgabe der vorliegenden Erfindung, einen Schalldämpfer, insbesondere Nachschalldämpfer, für eine Abgasanlage einer Brennkraftmaschine vorzusehen, bei welchem ein vereinfachtes Zusammensetzen der verschiedenen Komponenten bzw. Baugruppen desselben ermöglicht ist.The object of the present invention is to provide a silencer, in particular a rear silencer, for an exhaust system of an internal combustion engine, in which a simplified assembly of the various components or assemblies thereof is made possible.

Erfindungsgemäß wird diese Aufgabe gelöst durch einen Schalldämpfer, insbesondere Nachschalldämpfer, für eine Abgasanlage einer Brennkraftmaschine gemäß Anspruch 1. Dieser Schalldämpfer umfasst ein Schalldämpfergehäuse mit einem in Richtung einer Gehäuselängsachse langgestreckten Gehäusemantel und an beiden axialen Endbereichen des Gehäusemantels jeweils einen mit dem Gehäusemantel verbundenen Außenboden, wobei der Gehäusemantel mit den Außenböden einen Schalldämpferinnenraum umgrenzt und in dem Schalldämpferinnenraum wenigstens ein den Schalldämpferinnenraum unterteilender Innenboden angeordnet ist, ferner umfassend eine Schalldämpfungseinheit mit einem abgasführenden Innenrohr, einem das Innenrohr umgebenden Außenrohr und zwischen dem Innenrohr und dem Außenrohr angeordnetem Schalldämmungsmaterial, wobei das Innenrohr in einer Öffnung eines Innenbodens und einer Öffnung eines der Außenböden oder eines weiteren Innenbodens aufgenommen ist und das Außenrohr mit dem Innenboden und dem einen der Außenböden oder weiteren Innenboden fest verbunden ist. Das Außenrohr weist in jedem seiner axialen Endbereiche einen radialen Abstand zum Innenrohr auf.According to the invention, this object is achieved by a muffler, in particular a rear muffler, for an exhaust system of an internal combustion engine according to claim 1. This muffler comprises a muffler housing with a housing jacket elongated in the direction of a housing longitudinal axis and an outer base connected to the housing jacket at both axial end regions of the housing jacket, wherein the housing jacket with the Outer floors delimiting a silencer interior and in the silencer interior at least one inner floor dividing the silencer interior is arranged, further comprising a silencing unit with an exhaust-conducting inner pipe, an outer pipe surrounding the inner pipe and sound insulation material arranged between the inner pipe and the outer pipe, the inner pipe in an opening of an inner floor and an opening of one of the outer floors or a further inner floor is received and the outer tube is firmly connected to the inner floor and one of the outer floors or further inner floor. The outer tube has a radial distance from the inner tube in each of its axial end regions.

Da bei diesem erfindungsgemäß aufgebauten Schalldämpfer eine Anbindung der Schalldämpfungseinheit über das Außenrohr an einen Innenboden und einen der Außenböden oder zwei von dem Innenrohr durchsetzte Innenböden erfolgt, ist es nicht erforderlich, eine direkte Anbindung des Außenrohrs an das Innenrohr zu realisieren. Dies vereinfacht den Aufbau, da die Schalldämpfungseinheit mit dem Innenohr, dem Außenrohr und dem Schalldämpfungsmaterial in einfacher Weise hergestellt werden kann, z.B. indem nach Positionierung des Innenrohrs im Außenrohr der dazwischen gebildete Zwischenraum mit dem Schalldämmungsmaterial gefüllt wird. Weitere Maßnahmen zum Herstellen einer festen Anbindung des Außenrohrs an das Innenrohr sind nicht erforderlich.Since this silencer constructed according to the invention connects the silencer unit via the outer tube to an inner floor and one of the outer floors or two inner floors penetrated by the inner tube, it is not necessary to implement a direct connection of the outer tube to the inner tube. This simplifies the construction because the soundproofing unit with the inner ear, the outer pipe and the soundproofing material can be produced in a simple manner, for example by filling the gap formed therebetween with the soundproofing material after the inner pipe has been positioned in the outer pipe. Further measures for establishing a fixed connection between the outer tube and the inner tube are not required.

Eine feste Einbindung der Schalldämpfungseinheit wird dadurch gewährleistet, dass das Außenrohr mit dem Innenboden und dem einen der Außenböden oder weiteren Innenboden durch Verschweißen verbunden ist.A firm integration of the soundproofing unit is ensured by the fact that the outer tube is connected to the inner floor and one of the outer floors or further inner floors by welding.

Um die definierte Positionierung des Außenrohrs bezüglich des Innenbodens einerseits bzw. des einen der Außenböden oder weiteren Innenbodens andererseits in einfacher Weise gewährleisten zu können, ist in dem Innenboden und dem einen der Außenböden oder weiteren Innenboden eine das Außenrohr aufnehmende axiale Ausformung ausgebildet. Dabei ist für eine einfache Aufnahme der Schalldämpfungseinheit vorzugsweise vorgesehen, dass die in dem Innenboden ausgebildete axiale Ausformung und die in dem einen der Außenböden oder weiteren Innenboden ausgebildete axiale Ausformung axial voneinander weg orientiert sind.In order to be able to easily ensure the defined positioning of the outer tube with respect to the inner bottom on the one hand or one of the outer bottoms or further inner bottom on the other hand, an axial shape receiving the outer tube is formed in the inner bottom and one of the outer floors or further inner bottom. For a simple reception of the sound-damping unit, it is preferably provided that the axial formation formed in the inner floor and that in one of the outer floors or further inner bottom formed axial formation are oriented axially away from each other.

Dabei kann vorteilhafter Weise vorgesehen sein, dass die im Innenboden vorgesehene Öffnung im Bereich der im Innenboden ausgebildeten axialen Ausformung vorgesehen ist, oder/und dass die in dem einen der Außenböden oder weiteren Innenboden vorgesehene Öffnung im Bereich der im Außenboden oder weiteren Innenboden ausgebildeten axialen Ausformung vorgesehen ist.It can advantageously be provided that the opening provided in the inner base is provided in the area of the axial formation formed in the inner base, and / or that the opening provided in one of the outer bases or further inner bases is provided in the area of the axial formation formed in the outer base or further inner base is provided.

Um auch in einfacher Weise eine feste und definierte Positionierung des Innenrohrs zu gewährleisten, kann am Innenboden die im Innenboden ausgebildete Öffnung umgebend ein in Richtung von der im Innenboden vorgesehenen axialen Ausformung axial weg orientierter, das Innenrohr umgebender Hals vorgesehen sein, oder/und kann an dem einen der Außenböden oder weiteren Innenboden die im Außenboden oder weiteren Innenboden ausgebildete Öffnung umgebend ein in Richtung von der im Außenboden oder weiteren Innenboden vorgesehenen axialen Ausformung axial weg orientierter, das Innenrohr umgebender Hals vorgesehen sein. Da der Hals in Richtung von einer jeweiligen Ausformung axial weg orientiert ist, also nicht in den durch die Ausformung bereitgestellten Innenraum eingreifend positioniert ist, in welchen Innenraum das Außenrohr und auch das Schalldämmungsmaterial eingreifend positioniert werden können, kann ein gegenseitiges Stören eines derartigen Halses insbesondere mit dem Schalldämmungsmaterial vermieden werden.In order to ensure a fixed and defined positioning of the inner tube in a simple manner, the opening formed in the inner bottom can be provided on the inner bottom, surrounding a neck which is axially oriented away from the axial formation provided in the inner bottom, and surrounds the inner tube, and / or can on One of the outer floors or further inner floors surrounding the opening formed in the outer floor or further inner floor can be provided with a neck which surrounds the inner tube and is oriented axially away in the direction of the axial formation provided in the outer floor or further inner floor. Since the neck is oriented axially away in the direction of a respective formation, that is, it is not positioned so as to engage in the interior space provided by the formation, in which interior the outer tube and also the sound insulation material can be positioned to engage, mutual interference of such a neck can, in particular, also occur the sound insulation material can be avoided.

Dabei kann eine feste Anbindung des Innenrohrs dadurch erreicht werden, dass das Innenrohr mit dem am Innenboden vorgesehenen Hals vorzugsweise durch Verschweißen fest verbunden ist, oder/und dass das Innenrohr mit dem an dem einen der Außenböden oder weiteren Innenboden vorgesehenen Hals vorzugsweise durch Verschweißen fest verbunden ist. Ferner kann für einen einfachen Aufbau vorgesehen sein, dass der am Innenboden vorgesehene Hals und der an dem einen der Außenböden oder weiteren Innenboden vorgesehene Hals axial voneinander weg orientiert sind.A firm connection of the inner tube can be achieved in that the inner tube is firmly connected to the neck provided on the inner floor, preferably by welding, and / or that the inner tube is firmly connected to the neck provided on one of the outer floors or further inner floors, preferably by welding is. Furthermore, it can be provided for a simple structure that the neck provided on the inner bottom and the one on the one the necks provided for the outer bottoms or further inner bottoms are oriented axially away from one another.

Für einen einfachen Aufbau wird vorgeschlagen, dass das Außenrohr zylindrisch ausgebildet ist.For a simple structure, it is proposed that the outer tube is cylindrical.

Um die Schalldämmungscharakteristik des schalldämmenden Materials effizient nutzen zu können, kann in dem vom Schalldämmungsmaterial umgebenen Längenbereich des Innenrohrs eine Mehrzahl von eine Rohrwandung des Innenrohrs durchsetzenden Öffnungen vorgesehen sein.In order to be able to use the soundproofing characteristics of the soundproofing material efficiently, a plurality of openings penetrating a pipe wall of the inner pipe can be provided in the length region of the inner pipe surrounded by the soundproofing material.

Ferner wird für eine effiziente Minderung des Schallpegels vorgeschlagen, dass das Schalldämmungsmaterial einen zwischen dem Außenrohr und dem Innenrohr gebildeten Zwischenraum im Wesentlichen vollständig ausfüllt.Furthermore, for an efficient reduction of the sound level, it is proposed that the sound insulation material essentially completely fills an intermediate space formed between the outer pipe and the inner pipe.

Beispielsweise kann das Schalldämmungsmaterial Fasermaterial oder/und geschäumtes Material umfassen.For example, the sound insulation material can comprise fiber material and / or foamed material.

Der Innenboden oder/und der eine der Außenböden oder weitere Innenboden kann mit der erfindungsgemäß vorzusehenden Struktur in einfacher Art und Weise als Blechumformteil bereitgestellt werden.The inner floor and / or one of the outer floors or further inner floors can be provided in a simple manner as a shaped sheet metal part with the structure to be provided according to the invention.

Die Erfindung betrifft ferner eine Abgasanlage, umfassend einen erfindungsgemäß aufgebauten Schalldämpfer.The invention also relates to an exhaust system comprising a silencer constructed according to the invention.

Die vorliegende Erfindung wird nachfolgend mit Bezug auf die beiliegende Fig. 1 detailliert beschrieben, welche einen Längenbereich eines Schalldämpfers für eine Abgasanlage einer Brennkraftmaschine im vereinfachten Längsschnitt zeigt.The present invention will be explained hereinafter with reference to the accompanying Fig. 1 described in detail, which shows a length range of a muffler for an exhaust system of an internal combustion engine in a simplified longitudinal section.

In Fig. 1 ist ein Endbereich eines allgemein mit 10 bezeichneten Schalldämpfers für eine Abgasanlage einer Brennkraftmaschine in einem Fahrzeug dargestellt. Beispielsweise kann ein derartiger Schalldämpfer 10 als Nachschalldämpfer im Endbereich der Abgasanlage vorgesehen sein.In Fig. 1 shows an end region of a muffler, generally designated 10, for an exhaust system of an internal combustion engine in a vehicle. For example, such a muffler 10 can be provided as a rear muffler in the end area of the exhaust system.

Der Schalldämpfer 10 umfasst ein Schalldämpfergehäuse 12 mit einem beispielsweise im Wesentlichen zylindrischen und in Richtung einer Gehäuselängsachse A langgestreckten Gehäusemantel 14. An beiden axialen Endbereichen des Gehäusemantels 14 ist dieser jeweils mit einem Außenboden 16 beispielsweise durch Umbördeln oder/und Verschweißen fest verbunden, so dass der Gehäusemantel 14 mit den beiden Außenböden 16 einen Gehäuseinnenraum 18 umgrenzt.The muffler 10 comprises a muffler housing 12 with, for example, a substantially cylindrical housing jacket 14 that is elongated in the direction of a housing longitudinal axis A. At both axial end regions of the housing jacket 14, the latter is firmly connected to an outer base 16, for example by flanging and / or welding, so that the Housing jacket 14 delimits a housing interior 18 with the two outer bottoms 16.

Im Gehäuseinnenraum 18 ist im dargestellten Beispiel in axialem Abstand zum Außenboden 16 ein Innenboden 20 vorgesehen. Der Innenboden 20 unterteilt den Gehäuseinnenraum 18 in mehrere Raumbereiche, so dass im dargestellten Ausgestaltungsbeispiel zwischen dem dargestellten Außenboden 16 und dem Innenboden 20 eine Kammer 22 gebildet ist. Aus Schalldämmungsgründen kann beispielsweise der Innenboden 20 eine Perforierung aufweisen, so dass die Kammer 20 zum verbleibenden Bereich des Gehäuseinnenraums 18 offen ist und somit einen Resonatorraum bilden kann.In the example shown, an inner floor 20 is provided in the housing interior 18 at an axial distance from the outer floor 16. The inner bottom 20 divides the Housing interior 18 into several spatial areas, so that in the illustrated embodiment, a chamber 22 is formed between the illustrated outer base 16 and the inner base 20. For reasons of soundproofing, for example, the inner bottom 20 can have a perforation so that the chamber 20 is open to the remaining area of the housing interior 18 and can thus form a resonator chamber.

Eine allgemein mit dem Bezugszeichen 24 bezeichnete Schalldämpfungseinheit umfasst ein abgasführendes Innenrohr 26 sowie ein das Innenrohr 26 umgebendes, im Wesentlichen zylindrisch gestaltetes Außenrohr 28. Ein zwischen dem Innenrohr 26 und dem Außenrohr 28 gebildeter Zwischenraum 30 ist mit schalldämmendem Material 32 im Wesentlichen vollständig gefüllt.A sound attenuation unit, generally designated by the reference number 24, comprises an exhaust-gas-carrying inner pipe 26 and an essentially cylindrical outer pipe 28 surrounding the inner pipe 26. An intermediate space 30 formed between the inner pipe 26 and the outer pipe 28 is essentially completely filled with sound-absorbing material 32.

Die Schalldämpfungseinheit 24 kann für den Schalldämpfer 10 als vormontierte Baugruppe bereitgestellt werden. Dazu kann das Innenrohr 26 im Außenrohr 28 positioniert werden und der dazwischen gebildete Zwischenraum 30 dann mit dem Schalldämmungsmaterial 32 gefüllt werden. Das Schalldämmungsmaterial 32 kann beispielsweise geschäumtes Material sein, welches nach dem definierten Positionieren des Innenrohrs 26 bezüglich des Außenrohrs 28 in den Zwischenraum 30 eingespritzt wird. Das Schalldämmungsmaterial 32 kann alternativ auch Fasermaterial umfassen, welches in den Zwischenraum 30 eingestopft wird oder beispielsweise in Form einer Fasermatte vor dem Einführen des Innenrohrs 26 in das Außenrohr 28 um das Innenrohr 26 gewickelt werden kann und dann zusammen mit dem Innenrohr 26 in das Außenrohr 28 eingeführt werden kann.The sound attenuation unit 24 can be provided for the sound absorber 10 as a preassembled assembly. For this purpose, the inner pipe 26 can be positioned in the outer pipe 28 and the intermediate space 30 formed between them can then be filled with the sound insulation material 32. The sound insulation material 32 can for example be foamed material which is injected into the space 30 after the defined positioning of the inner pipe 26 with respect to the outer pipe 28. The soundproofing material 32 can alternatively also comprise fiber material, which is plugged into the space 30 or, for example, in the form of a fiber mat, can be wrapped around the inner tube 26 before the inner tube 26 is inserted into the outer tube 28 and then, together with the inner tube 26, into the outer tube 28 can be introduced.

Man erkennt, dass das Außenrohr 28 aufgrund seiner zylindrischen Gestalt in seinen beiden axialen Endbereichen 34, 36, ebenso wie in den dazwischen liegenden Längenbereichen, radialen Abstand zum Innenrohr 26 aufweist und insbesondere an dieses in keinem Längenbereich direkt angebunden ist. Ein Zusammenhalt dieser Schalldämpfungseinheit 24 wird über das zwischen dem Innenrohr 26 und dem Außenrohr 28 angeordnete schalldämmende Material 32 gewährleistet. Um die schalldämmende Charakteristik des schalldämmenden Materials 32 effizient nutzen zu können, ist in dem Innenrohr 26 eine Perforierung mit einer Mehrzahl von eine Rohrwandung 33 desselben durchsetzenden Öffnungen 35 vorgesehen.It can be seen that, due to its cylindrical shape, the outer tube 28 is at a radial distance from the inner tube 26 in its two axial end regions 34, 36, as well as in the intermediate length regions, and in particular is not directly connected to this in any length region. The cohesion of this sound-damping unit 24 is ensured by the sound-damping material 32 arranged between the inner pipe 26 and the outer pipe 28. To use the sound-absorbing characteristic of the sound-absorbing material 32 efficiently To be able to, a perforation with a plurality of openings 35 penetrating a pipe wall 33 is provided in the inner pipe 26.

Bei dem in Fig. 1 dargestellten Schalldämpfer 10 ist die Schalldämpfungsbaugruppe 24 zwischen dem in dieser Figur dargestellten Außenboden 16 und dem in axialem Abstand dazu angeordneten Innenboden 20 angeordnet und daran gehalten. Hierzu weist der Außenboden 16 eine axiale Ausformung 38 auf, welche derart dimensioniert und an die Umfangskontur des Außenrohrs 28 angepasst ist, dass dieses mit seinem axialen Endbereich 34 beispielsweise unter leichter Presspassung axial in die axiale Ausformung 38 bzw. den darin gebildeten Raumbereich eingesetzt werden kann. In einem beispielsweise zentral in der axialen Ausformung 38 liegenden Bereich ist am Außenboden 16 eine Öffnung 40 gebildet, die von einem am Außenboden 16 ebenfalls vorgesehenen Hals 42 umgeben ist. Das axial über das Außenrohr 28 bzw. das schalldämmende Material 32 hervorstehende Innenrohr 26 greift mit seinem axialen Endbereich 44 in die Öffnung 40 bzw. den Hals 42 ein. Auch hier kann die Dimensionierung der Öffnung 40 bzw. des Halses 42 so gewählt bzw. auf die Außenumfangskontur des Innenrohrs 26 in seinem axialen Endbereich 44 abgestimmt sein, dass das Innenrohr 26 unter leichter Presspassung in der Öffnung 40 bzw. im Hals 42 aufgenommen ist, ggf. auch geringfügig nach außen über den Hals 42 hervorsteht. Da der Hals 42 in Richtung von der Ausformung 38 axial weg orientiert ist und nicht in die Ausformung 38 bzw. den durch diese bereitgestellten Innenraum eingreift, besteht keine den Zusammenbau erschwerende Wechselwirkung zwischen dem Hals 42 und dem in die Ausformung eingreifend positionierten schalldämmenden Material 32.The in Fig. 1 The silencer 10 shown, the silencer assembly 24 is arranged between the outer base 16 shown in this figure and the inner base 20 arranged at an axial distance therefrom and held thereon. For this purpose, the outer base 16 has an axial formation 38 which is dimensioned and adapted to the circumferential contour of the outer tube 28 so that its axial end area 34 can be inserted axially into the axial formation 38 or the spatial area formed therein, for example with a slight interference fit . In an area located, for example, centrally in the axial recess 38, an opening 40 is formed on the outer base 16, which is surrounded by a neck 42 likewise provided on the outer base 16. The inner tube 26 protruding axially beyond the outer tube 28 or the sound-absorbing material 32 engages with its axial end region 44 in the opening 40 or the neck 42. Here, too, the dimensions of the opening 40 or the neck 42 can be selected or matched to the outer circumferential contour of the inner tube 26 in its axial end region 44 such that the inner tube 26 is received with a slight interference fit in the opening 40 or in the neck 42, possibly also protrudes slightly outwards beyond the neck 42. Since the neck 42 is oriented axially away from the formation 38 and does not engage in the formation 38 or the interior space provided by it, there is no interaction between the neck 42 and the sound-absorbing material 32 which is positioned so as to engage in the formation.

Auch im Innenboden 20 ist eine axiale Ausformung 46 vorgesehen. Diese ist von der im Außenboden 16 vorgesehenen axialen Ausformung 38 weg orientiert und nimmt den axialen Endbereich 36 des Außenrohrs 28 bzw. den in diesem axialen Endbereich 36 des Außenrohrs 28 auch vorgesehenen Teil des schalldämmenden Materials 32 auf. Auch hier ist vorzugsweise die axiale Ausformung 46 hinsichtlich Formgebung und Dimensionierung an die Formgebung bzw. Dimensionierung des Außenrohrs 28 in seinem axialen Endbereich 36 angepasst, so dass das Außenrohr 28 mit seinem axialen Endbereich 36 unter leichter Presspassung in der axialen Ausformung 46 aufgenommen werden kann.An axial recess 46 is also provided in the inner bottom 20. This is oriented away from the axial recess 38 provided in the outer base 16 and accommodates the axial end region 36 of the outer tube 28 or the part of the sound-absorbing material 32 also provided in this axial end region 36 of the outer tube 28. Here, too, the axial formation 46 is preferably adapted in terms of shape and dimensioning to the shape or dimensioning of the outer tube 28 in its axial end region 36, so that the outer tube 28 can be received with its axial end region 36 with a slight interference fit in the axial recess 46.

Im zentralen Beriech der axialen Ausformung 46 des Innenbodens 20 ist eine einen Endbereich 49 des Innenrohrs 26 aufnehmende bzw. von diesem durchsetzte Öffnung 48 vorgesehen und durch einen am Innenboden 20 gebildeten und näherungsweise axial sich erstreckenden Hals 50 umgeben. Der Hals 50 ist von der axialen Ausformung 46, also dem in dieser gebildeten Innenraum, weg orientiert, so dass auch hier kein gegenseitiges Stören mit dem in die axiale Ausformung 46 eingreifenden Bereich des schalldämmenden Materials 32 entsteht. Insbesondere ist zu erkennen, dass auch der Hals 50 vom Außenboden 16 weg orientiert ist, so dass der am Außenboden 16 vorgesehene Hals 42 und der am Innenboden 20 vorgesehene Hals 50 voneinander weg orientiert sind.In the central area of the axial formation 46 of the inner base 20, an opening 48 receiving or penetrating an end region 49 of the inner tube 26 is provided and is surrounded by a neck 50 formed on the inner base 20 and extending approximately axially. The neck 50 is oriented away from the axial formation 46, that is to say the interior space formed therein, so that here, too, there is no mutual interference with the area of the sound-absorbing material 32 engaging in the axial formation 46. In particular, it can be seen that the neck 50 is also oriented away from the outer base 16, so that the neck 42 provided on the outer base 16 and the neck 50 provided on the inner base 20 are oriented away from one another.

Ein fester Zusammenhalt der verschiedenen Komponenten bzw. Baugruppen kann durch Materialschluss, also beispielsweise durch Verschweißen realisiert sein. So ist vorzugsweise der Innenboden 20 durch eine Verschweißung 52, beispielsweise eine umlaufende Schweißnaht oder eine Mehrzahl von Schweißpunkten, am Gehäusemantel 14 festgelegt. Zur Sicherstellung eines gegen den Austritt von Abgas dichten Abschlusses ist das Innenrohr 26 in seinem axialen Endbereich 44 durch eine Verschweißung 54, vorzugsweise eine umlaufende Schweißnaht, am Außenboden 16, vorzugsweise dem Hals 42 desselben, festgelegt. In entsprechender Weise kann, obgleich dies aus Gründen des Abgasdurchtritts nicht zwingend erforderlich ist, kann das Innenrohr 26 auch in seinem anderen axialen Endbereich 49 durch eine Verschweißung 56, vorzugsweise wiederum eine umlaufende Schweißnaht, am Innenboden 20, vorzugsweise dem Hals 50 desselben festgelegt sein. Für eine feste Anbindung der Schalldämpfungsbaugruppe 24 sorgt insbesondere eine materialschlüssige Verbindung des Außenrohrs 28 mit dem im Boden 20 im Bereich einer Verschweißung 58, welche vorzugsweise wiederum als umlaufende Schweißnaht oder eine Mehrzahl von mit Abstand zueinander angeordneten Schweißpunkten ausgebildet sein kann. Alternativ oder zusätzlich kann durch eine Verschweißung 60 das Außenrohr 28 am Außenboden 16 festgelegt sein, wobei auch die Verschweißung 60 eine umlaufende Schweißnaht oder eine Mehrzahl von mit Abstand zueinander angeordneten Schweißpunkten umfassen kann. Wird das Außenrohr 28 in seinen beiden axialen Endbereich 34, 36 am Außenboden 16 bzw. am Innenboden 20 durch Verschweißen festgelegt, wodurch auch eine vergleichsweise starre Verbindung dieser beiden Böden miteinander eingeführt wird, kann es vorteilhaft sein, aufgrund der im Betrieb zu erwartenden verschiedenen thermischen Ausdehnungen des Innenrohrs 26 einerseits und des Außenrohrs 28 andererseits, das Innenrohr 26 in seinem Endbereich 49 nicht starr an den Innenboden 20 anzubinden.The various components or assemblies can be held together firmly by material bonding, that is to say, for example, by welding. Thus, the inner base 20 is preferably fixed on the housing jacket 14 by a weld 52, for example a circumferential weld seam or a plurality of weld points. To ensure a seal against the escape of exhaust gas, the inner tube 26 is fixed in its axial end region 44 by a weld 54, preferably a circumferential weld seam, on the outer base 16, preferably the neck 42 thereof. In a corresponding manner, although this is not absolutely necessary for reasons of the exhaust gas passage, the inner tube 26 can also be fixed in its other axial end region 49 by a weld 56, preferably again a circumferential weld seam, on the inner base 20, preferably the neck 50 thereof. A solid connection between the outer tube 28 and the one in the base 20 in the area of a weld 58, which in turn can preferably be designed as a circumferential weld seam or a plurality of spaced-apart weld points, ensures a firm connection of the sound attenuation assembly 24. Alternatively or additionally, the outer tube 28 can be fixed to the outer base 16 by a weld 60, the weld 60 also being a circumferential weld seam or a May comprise a plurality of spaced apart weld points. If the outer tube 28 is fixed in its two axial end regions 34, 36 on the outer base 16 and on the inner base 20 by welding, which also introduces a comparatively rigid connection between these two bases, it can be advantageous due to the different thermal Expansions of the inner tube 26 on the one hand and of the outer tube 28 on the other hand, the inner tube 26 in its end region 49 is not rigidly connected to the inner base 20.

Durch die feste Anbindung des Außenrohrs 28 an den Innenboden 20 oder/und den Außenboden 16 jeweils angrenzend an die darin gebildete axiale Ausformung 38 bzw. 46 wird eine stabile Halterung der Schalldämpfungseinheit 24 im Schalldämpfer 10 gewährleistet. Dies kann unterstützt werden durch die feste Anbindung des Innenrohrs 26 in zumindest einem seiner beiden Endbereiche 44, 49 an den Außenboden 16 bzw. den Innenboden 20.The fixed connection of the outer tube 28 to the inner base 20 and / or the outer base 16, each adjacent to the axial formation 38 or 46 formed therein, ensures that the sound-damping unit 24 is held securely in the muffler 10. This can be supported by the fixed connection of the inner tube 26 in at least one of its two end regions 44, 49 to the outer base 16 or the inner base 20.

Es wird darauf hingewiesen, dass die Prinzipien der vorliegenden Erfindung auch genutzt werden können, wenn die Schalldämpfungseinheit 24 in ihren beiden axialen Endbereichen bzw. den beiden axialen Endbereichen 34, 36 des Außenrohrs 28 an zwei im Gehäuseinnenraum 18 des Schalldämpfers 10 angeordneten Innenböden getragen bzw. festgelegt ist.It should be noted that the principles of the present invention can also be used if the sound-damping unit 24 is carried or supported in its two axial end regions or the two axial end regions 34, 36 of the outer tube 28 on two inner floors arranged in the housing interior 18 of the sound absorber 10. is fixed.

Claims (12)

  1. Muffler, especially rear muffler, for an exhaust system of an internal combustion engine, comprising a muffler housing (12) with a housing jacket (14) elongated in the direction of a housing longitudinal axis (A) and with a respective outer panel (16) connected to the housing jacket (14) at both axial end areas of the housing jacket (14), wherein the housing jacket (14) defines with the outer panels (16) a muffler interior (18) and at least one inner panel (20) dividing the muffler interior (18) is arranged in the muffler interior (18), further comprising a muffling unit (24) with an exhaust-gas-carrying inner pipe (26), with an outer pipe (28) enclosing the inner pipe (26) and muffling material (32) arranged between the inner pipe (26) and the outer pipe (28), wherein the inner pipe (26) is accommodated in an opening (48) of an inner panel (20) and in an opening (40) of one of the outer panels (16) or of an additional inner panel, characterized in that the outer pipe (28) has a radial distance to the inner pipe (26) in each of its axial end areas (34, 36), that an axial bulge (46) accommodating the outer pipe (28) is formed in the inner panel (20), that an axial bulge (38) accommodating the outer pipe (28) is formed in the one of the outer panels (16) or in the additional inner panel, that the outer pipe (28) accommodated in the axial bulge (46) of the inner panel (20) is connected by welding to the inner panel (20) and that the outer pipe (28) accommodated in the axial bulge (38) of the outer panel (16) or in the additional inner panel is connected by welding to the one of the outer panels (16) or the additional inner panel.
  2. Muffler in accordance with claim 1, characterized in that the opening (48) provided in the inner panel (20) is provided in the area of the axial bulge (46) formed in the inner panel (20), or/and that the opening (40) provided in the one of the outer panels (16) or in the additional inner panel is provided in the area of the axial bulge (38) formed in the outer panel (16) or in the additional inner panel.
  3. Muffler in accordance with claims 1 or 2, characterized in that the axial bulge (46) formed in the inner panel (20) and the axial bulge (38) formed in the one of the outer panels (16) or in the additional inner panel are oriented axially away from one another.
  4. Muffler in accordance with claims 2 or 3, characterized in that a neck (50), which encloses the inner pipe (26), is oriented axially away in the direction of the axial bulge (48) provided in the inner panel (20) and encloses the opening (48) formed in the inner panel (20), is provided at the inner panel (20), or/and that a neck (42), which encloses the inner pipe (26), is oriented axially away in the direction of the axial bulge (38) provided in the outer panel (16) or in the additional inner panel and encloses the opening (40) formed in the outer panel (16) or in the additional inner panel, is provided at the one of the outer panels (16) or at the additional inner panel.
  5. Muffler in accordance with claim 4, characterized in that the inner pipe (26) is permanently connected, preferably by welding, to the neck (50) provided at the inner panel (20), or/and that the inner pipe (26) is permanently connected, preferably by welding, to the neck (42) provided at the one of the outer panels (16) or the additional inner panel.
  6. Muffler in accordance with claims 4 or 5, characterized in that the neck (50) provided at the inner panel (20) and the neck (42) provided at one of the outer panels (16) or at the additional inner panel are oriented axially away from one another.
  7. Muffler in accordance with one of the preceding claims, characterized in that the outer pipe (28) has a cylindrical configuration.
  8. Muffler in accordance with one of the preceding claims, characterized in that a plurality of openings (35) passing through a pipe wall (33) of the inner pipe (26) are provided in the length area of the inner pipe (26), which length area is enclosed by the muffling material (32).
  9. Muffler in accordance with one of the preceding claims, characterized in that the muffling material (32) essentially entirely fills up an intermediate space (30) formed between the outer pipe (28) and the inner pipe (26).
  10. Muffler in accordance with one of the preceding claims, characterized in that the muffling material (32) comprises fiber material or/and foamed material.
  11. Muffler in accordance with one of the preceding claims, characterized in that the inner panel (20) or/and the one of the outer panels (16) or the additional inner panel is a shaped sheet metal part.
  12. Exhaust system, comprising a muffler (10) in accordance with one of the preceding claims.
EP19181245.2A 2018-06-29 2019-06-19 Sound absorber Active EP3587754B1 (en)

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US1732818A (en) * 1927-11-14 1929-10-22 Oldberg Virgil Muffler
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CN110657001B (en) 2021-10-22
CN110657001A (en) 2020-01-07
EP3587754A1 (en) 2020-01-01
US20200003093A1 (en) 2020-01-02
DE102018115742A1 (en) 2020-01-02
US11384665B2 (en) 2022-07-12

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