EP4124731B1 - Silencer - Google Patents

Silencer Download PDF

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Publication number
EP4124731B1
EP4124731B1 EP22181135.9A EP22181135A EP4124731B1 EP 4124731 B1 EP4124731 B1 EP 4124731B1 EP 22181135 A EP22181135 A EP 22181135A EP 4124731 B1 EP4124731 B1 EP 4124731B1
Authority
EP
European Patent Office
Prior art keywords
housing
shell
noise damper
insulating
shells
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
EP22181135.9A
Other languages
German (de)
French (fr)
Other versions
EP4124731A1 (en
Inventor
Martin Strähle
Michaela Weber
Jonathan Lang
Lukas Te-Kaat
Marco Jess
Frank Sühnel
Markus Schmitt
Matthias Scheer
Harald Gerlich
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
Purem 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
Application filed by Purem GmbH filed Critical Purem GmbH
Publication of EP4124731A1 publication Critical patent/EP4124731A1/en
Application granted granted Critical
Publication of EP4124731B1 publication Critical patent/EP4124731B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
    • F01N1/023—Helmholtz resonators
    • 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
    • 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
    • F01N1/089—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using two or more expansion chambers in series
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/14—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having thermal insulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • 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
    • 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
    • F01N13/1888—Construction facilitating manufacture, assembly, or disassembly the housing of the assembly consisting of two or more parts, e.g. two half-shells
    • 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
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/20—Exhaust treating devices having provisions not otherwise provided for for heat or sound protection, e.g. using a shield or specially shaped outer surface of exhaust device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/22—Methods or apparatus for fitting, inserting or repairing different elements by welding or brazing
    • 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
    • F01N2470/18—Structure or shape of gas passages, pipes or tubes the axis of inlet or outlet tubes being other than the longitudinal axis of apparatus
    • 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
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/08—Two or more expansion chambers in series separated by apertured walls only
    • 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
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/15—Plurality of resonance or dead chambers

Definitions

  • the present invention relates to a silencer for an exhaust system of an internal combustion engine.
  • a silencer for an exhaust system of an internal combustion engine is known according to the preamble of claim 1, the silencer housing of which is constructed with two housing shells formed by forming sheet metal material.
  • the two housing shells each have a curved shell body and a housing shell peripheral edge with a contact surface that protrudes outwards from this.
  • the housing shell peripheral edges of the two housing shells are positioned opposite one another below an intermediate storage of an inner plate that divides the interior of the silencer housing into two chambers and are connected to one another by laser welding.
  • the inner plate, together with one of the housing shells forms an inlet area through which exhaust gas flows into one of the chambers.
  • the inner plate, together with the other of the two housing shells forms an outlet area through which exhaust gas exits the other of the two chambers.
  • the two chambers are connected to one another via a plurality of openings formed in the inner plate.
  • a layer of thermal insulation made of high-density fiber material is placed, covering the inner surface of the housing shells that delimit this chamber on the outside.
  • the thermal insulation can be covered on at least one side with a stainless steel foil.
  • fiber material with a lower fiber density than that of the thermal insulation is also housed.
  • a silencer according to the preamble of claim 1 is known from US 2008/0127639 A1
  • This silencer has an insulating shell and an intermediate wall dividing an exhaust gas flow volume in the silencer interior into two chambers with respective connecting edges is arranged between the housing shell connecting edges of two housing shells and is firmly connected to them.
  • An inlet pipe and an outlet pipe are connected to openings formed in one of the two housing shells.
  • the FR 1,244,433 A discloses a silencer in which an inner housing constructed with two housing shells is arranged in a tubular outer housing constructed with two housing shells.
  • the inner housing is received with connecting edges of one of the two housing shells between connecting edges of the outer housing shells and is firmly connected to them.
  • the US 5,907,135 A discloses a silencer in which a tubular outer housing is constructed with two housing shells which are connected to one another in the region of respective connecting edges.
  • a tubular inner housing is also constructed with two housing shells and is received with respective connecting edges thereof between the connecting edges of the outer housing shells.
  • the JP H06-221147 A discloses a silencer in which an intermediate wall is arranged between one of two outer housing shells and an inner housing shell which delimits an exhaust gas flow volume with the latter and is firmly connected to them by welding.
  • a silencer for an exhaust system of an internal combustion engine comprises a silencer housing with at least two Housing shells which delimit the silencer interior and are connected to one another, wherein each housing shell has a housing shell connecting edge which extends in the direction away from the silencer interior and the housing shells are connected to one another by material bonding in the region of their housing shell connecting edges which are arranged opposite one another, and wherein an insulating arrangement which at least partially covers an inner side of at least one housing shell of the housing shells is provided in the silencer interior.
  • the insulation arrangement has at least one insulation shell with an insulation shell connecting edge extending in the direction away from the silencer interior, and the at least one insulation shell is arranged with its insulation shell connecting edge between the housing shell connecting edges of the housing shells arranged opposite one another and is connected in the region of the insulation shell connecting edge to the housing shell connecting edges of the housing shells by material bonding.
  • a stable, simple and cost-effective structure is achieved by using at least three shell-like components that are to be connected to one another, namely the housing shells and the insulating shell, in which the solid and, in particular, tight connection against the escape of exhaust gases is created by a material connection that includes these three components. Further measures are not required to integrate thermal insulation for at least one of the two housing shells that enclose the silencer interior.
  • the material connection connecting the insulation shell connection edge with the housing shell connection edges of the housing shells can comprise a weld seam that preferably runs essentially uninterrupted along the housing shell connection edges and the insulation shell connection edge.
  • This single three-body weld is used, for example, in A single welding process achieves a firm connection between the three shell-like components of the silencer.
  • At least the at least one housing shell of the housing shells can comprise a curved housing shell body surrounded by its housing shell connecting edge and delimiting the silencer interior
  • the at least one insulating shell can comprise a curved insulating shell body surrounded by its insulating shell connecting edge.
  • the insulating shell body and the housing shell body of the at least one housing shell of the housing shells are arranged at a distance from one another.
  • a gap-like intermediate space is thus formed between the insulating shell body and the housing shell body of the at least one housing shell of the housing shells, which provides an insulating layer with the gas accumulating therein.
  • the insulating shell body and the housing shell body of the at least one housing shell of the housing shells can lie against one another locally, for example in the region of formations provided thereon, in order to achieve defined mutual support. In such regions, these shell bodies can be firmly connected to one another, for example by welding.
  • a design which is simple and cost-effective to produce and is particularly suitable for carrying out a welding process can be provided by providing the housing shells and the insulating shell by formed sheet metal parts.
  • a Exhaust gas flow volume can be formed, wherein the exhaust gas flow volume is divided into a plurality of chambers by at least one intermediate wall. At least one intermediate wall is clamped between the insulating shell and the other housing shell of the housing shells. In this way, no additional measures are required to hold such an intermediate wall in a predetermined installation position in the silencer interior. Furthermore, by clamping one or more such intermediate walls, a defined bracing of the insulating shell with respect to the housing shells is achieved, so that the occurrence of vibration excitations leading to noise or damage in the silencer, in particular of the insulating shell, can be practically excluded.
  • the at least one insulating shell extends from a longitudinal end region of the silencer housing to an intermediate wall and covers the at least one housing shell of the housing shells on its inner side in an area extending between the one longitudinal end region of the silencer housing and the intermediate wall, and that in an area extending between the intermediate wall and the other longitudinal end region of the silencer housing, the at least one housing shell of the housing shells is not covered on its inner side by the at least one insulating shell. Furthermore, it can be provided for this purpose that a chamber at least partially filled with sound insulation material is formed between the intermediate wall and the other longitudinal end region of the silencer housing.
  • At least one exhaust gas inlet pipe open to the silencer interior and at least one exhaust gas outlet pipe open to the silencer interior are provided.
  • at least one pipe of the exhaust gas inlet pipe and exhaust gas outlet pipe is connected to the silencer housing in the region of a pipe receiving opening formed between the insulating shell connecting edge and the housing shell connecting edge of the other housing shell of the housing shells, preferably by material bonding.
  • a pipe of the exhaust gas inlet pipe and exhaust gas outlet pipe can be connected to the silencer housing in the region of a pipe receiving opening formed between the housing shell connecting edges of two housing shells, preferably by material bonding.
  • the invention further relates to an exhaust system for an internal combustion engine, in particular in a motor vehicle, comprising at least one silencer according to one of the preceding claims.
  • the Fig. 1 to 3 show a silencer, generally designated 10, for an exhaust system 12 of an internal combustion engine in a vehicle.
  • the silencer 10 comprises a silencer housing 14 with a housing shell 16 and a housing shell 18.
  • Each of the housing shells 16, 18 provided as sheet metal formed parts has a housing shell body 22, 24 curved outwards with respect to a silencer interior 20 delimited by the housing shells 16, 18.
  • Each housing shell body 22, 24 is surrounded by a housing shell connecting edge 26, 28 extending outwards with respect to the silencer interior 20.
  • the two housing shells 16, 18 lie opposite one another with their housing shell connecting edges 26, 28 and are connected in the region of the housing shell connecting edges 26, 28 in the manner described below.
  • An insulating arrangement 32 provided by an insulating shell 30 designed as a formed sheet metal part is provided in the silencer interior 20 delimited by the two housing shells 16, 18.
  • the insulating shell 30 has a curved insulating shell body 34 and an insulating shell connecting edge 36 surrounding it.
  • the insulating shell connecting edge 36 also extends outwards with respect to the silencer interior 20 and lies between the housing shell connecting edges 26, 28 in the assembled state.
  • the insulating shell body 30 is adapted to the curvature of the housing shell 18 in terms of its curvature.
  • the insulating shell body 34 of the insulating shell 30, whose shape is essentially adapted to the shape of the curved housing shell body 24 of the housing shell 18, is spaced apart from the housing shell body 24 when the insulating shell connecting edge 36 is positioned between the housing shell connecting edges 26, 28, so that a gap-like intermediate space 38 is formed between the insulating shell body 34 and the housing shell body 24.
  • the insulating shell 30 extends in the housing shell interior 20 delimited by the housing shells 16, 18 from a first longitudinal end region 40 of the silencer housing 14 to one of three intermediate walls 42, 44, 46 arranged in the silencer interior 20. In the area between the first Between the longitudinal end region 40 of the silencer housing 14 and the intermediate wall 42, the insulating shell 30 covers an inner side 48 of the housing shell 18 while maintaining the intermediate space 38.
  • the intermediate walls 42, 44, 46 divide the silencer interior 20 into four chambers 50, 52, 54, 56.
  • the chamber 50 extends essentially between the intermediate wall 42 and a second longitudinal end region 58 of the silencer housing 40.
  • the chamber 52 lies essentially between the two intermediate walls 42, 44.
  • the chamber 54 lies essentially between the two intermediate walls 44, 46, and the chamber 56 extends essentially between the intermediate wall 46 and the first longitudinal end region 40 of the silencer housing 14.
  • the chambers 50, 52, 54, 56 are connected to one another through openings provided in the intermediate walls 42, 44, 46.
  • the intermediate walls 44, 46 are located in the area in which the insulating shell 30 covers the inside 48 of the housing shell 18. As a result, direct contact between the intermediate walls 44, 46 and the housing shell 18 is not possible. The intermediate walls 44, 46 are therefore held between the insulating shell 30 and the housing shell 16. For this purpose, rib-like formations that protrude inwards and are assigned to one another in pairs can be formed on the insulating shell 30 on the one hand and the housing shell 16 on the other hand, between which the intermediate walls 44, 46 are held firmly and are thus clamped in all directions of movement between the insulating shell 30 and the housing shell 16.
  • the intermediate wall 42 can be positioned in such a way that it adjoins the insulating shell 30 in the direction from the first longitudinal end region 40 to the second longitudinal end region 58 of the silencer housing 14 and is thus held between the housing shells 16, 18 in the region of rib-like formations provided thereon in pairs and projecting inwards.
  • a gap-like intermediate space can be formed between the end region 60 of the insulating shell 30 that is close to the intermediate wall 42 and the intermediate wall 42.
  • the intermediate wall 42 could also be held between the housing shell 16 and the insulating shell 30 if, for example, two rib-like formations are provided on the insulating shell 30 in association with the intermediate wall 42, which receive the latter between them and project inwards.
  • the silencer 10 further comprises an inlet pipe 62 and an outlet pipe 64.
  • the inlet pipe 62 leads into the silencer interior 20 in the region of a pipe receiving opening 66 formed on the silencer housing 14 and passes through the partition walls 44, 46.
  • the inlet pipe 62 In its length region lying between the partition walls 44, 46, the inlet pipe 62 has a perforation 68, via which the inlet pipe 62 is open to the chamber 54.
  • the inlet pipe 62 is open to the chamber 56.
  • the outlet pipe 64 leads into the silencer interior 20 in the region of a pipe receiving opening 70 and passes through the intermediate walls 42, 44, 46. In the region of the chamber 56, the outlet pipe 64 is open to the chamber 56 at its end located in the silencer interior 20.
  • the outlet pipe 64 extends through the soundproofing material 72 arranged in the chamber 50.
  • This can be designed in block form and made of foamed or fibrous material.
  • the soundproofing material 72 could also be designed as a lining which, without occupying the entire volume or essentially the entire volume of the chamber 50, covers the housing shells 16, 18 in the region of the chamber 50 on their respective insides.
  • the pipe receiving opening 66 for the inlet pipe 62 is located in that area of the silencer housing 14 in which the insulating shell 30 covers the housing shell 18 on its inner side 48. Therefore, the pipe receiving opening 66 is essentially between the housing shell connection edge 26 of the Housing shell 16 and the insulating shell connecting edge 36 of the insulating shell 30.
  • the pipe receiving opening 70 for the outlet pipe 64 is provided at the second longitudinal end region 58 of the silencer housing 14 and is thus located in a region in which the housing shell 18 is not covered by the insulating shell 30 and therefore the insulating shell connecting edge 36 is not positioned between the housing shell connecting edges 26, 28.
  • the pipe receiving opening 70 for the outlet pipe 64 is therefore formed between the housing shell connecting edges 26, 28 of the housing shells 16, 18.
  • a silencer insert 74 can first be constructed, which comprises the partition walls 42, 44, 46, the soundproofing material 72, the inlet pipe 62 passing through the partition walls 44, 46, and the outlet pipe 64 passing through the soundproofing material 72 and the partition walls 42, 44, 46.
  • the inlet pipe 62 and the outlet pipe 64 can be connected to the partition walls 42, 44, 46 passed through by them by means of a material bond, for example welding, and/or by means of a press fit.
  • This silencer insert 74 can then be inserted, for example, into the housing shell 16, 18 which is not covered on its inside by the insulating shell 30. In the example shown, this is the housing shell 16.
  • the insulating shell 30 can first be placed on the silencer insert 74 so that it partially covers the housing shell connecting edge 26 of the housing shell 16 with its insulating shell connecting edge 36 and, together with the housing shell connecting edge 26 with its insulating shell connecting edge 36, surrounds the inlet pipe 62 in the region of the pipe receiving opening 66.
  • the other housing shell in the example shown, the housing shell 18, can be placed on top so that it covers the insulating shell 30 or the housing shell 16 and the silencer insert 74 already positioned on the housing shell 16.
  • the housing shell connecting edge 18 of the housing shell 18 then lies on the insulating shell connecting edge 36 in the area in which the insulating shell 30 with its insulating shell connecting edge 36 covers the housing shell connecting edge 26 of the housing shell 16, and lies directly opposite or on the housing shell connecting edge 26 of the housing shell 16 in the area in which the housing shell connecting edge 26 is not covered by the insulating shell connecting edge 36.
  • a step-like transition to a recessed area of the respective housing shell connecting edge can be formed in at least one of the housing shells 16, 18 in the area of their housing shell connecting edge 26, 28 in order to create sufficient receiving space for the insulating shell connecting edge 36 in the area in which the insulating shell connecting edge 36 is to be positioned between the housing shell connecting edges 26, 28.
  • the outlet pipe 64 is held in the region of the pipe receiving opening 70 between the housing shell connecting edges 26, 28 of the housing shells 16, 18, and the intermediate walls 42, 44, 46 are held between the insulating shell 30 and the housing shell 16 or between the housing shell 18 and the housing shell 16.
  • the housing shell connecting edges 26, 28, which partially accommodate the insulating shell connecting edge 36 between them, can be connected to one another by material bonding, preferably welding.
  • a weld seam 76 is formed, preferably running all the way around in the circumferential direction, to obtain a gas-tight seal.
  • the inlet pipe 62 and the outlet pipe 70 are welded to the pipe receiving openings 66 and 70 in their respective areas with the surrounding connection edges by material bonding, preferably welding.
  • a weld seam can be formed that runs completely around the respective pipe receiving opening 66, 70 to obtain a gas-tight seal.
  • the silencer described above can of course be designed differently in various aspects without deviating from the principles of the present invention.
  • the insulating shell could cover one of the housing shells on its entire inside.
  • the insulating shell could be designed in several parts, and an insulating shell could be provided in association with each of the two housing shells, so that two insulating shell connecting edges, possibly abutting one another, are then positioned between the housing shell connecting edges that are to be positioned opposite one another.
  • Insulating material for example an insulating mat, i.e. fiber material, could be arranged between the insulating shell and the housing shell covered by it on its inside in order to improve the thermal insulation even further.
  • both pipes i.e. the inlet pipe and the outlet pipe, must be connected to the housing shells in one area in which at least one of the housing shells is covered by an insulating shell.
  • both pipes could be connected to the silencer housing in an area in which none of the housing shells is covered by an insulating shell.
  • the silencer insert to be arranged in the silencer interior can be designed differently than shown in the embodiment example shown. It could comprise more or fewer partition walls. Furthermore, the silencer insert could be constructed in such a way that a Helmholtz resonator is formed in the silencer interior, and several inlet pipes and/or several outlet pipes could be provided in order to introduce exhaust gas into the silencer or to discharge it from the silencer.

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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 für eine Abgasanlage einer Brennkraftmaschine.The present invention relates to a silencer for an exhaust system of an internal combustion engine.

Aus der EP 1 512 852 B1 ist ein Schalldämpfer für eine Abgasanlage einer Brennkraftmaschine gemäß dem Oberbegriff des Anspruchs 1 bekannt, dessen Schalldämpfergehäuse mit zwei durch Umformen von Blechmaterial gebildeten Gehäuseschalen aufgebaut ist. Die beiden Gehäuseschalen weisen jeweils einen gewölbten Schalenkörper und eine von diesem nach außen hervorstehenden Gehäuseschalen-Umfangsrand mit einer Anlagefläche auf. Die Gehäuseschalen-Umfangsränder der beiden Gehäuseschalen werden unten Zwischenlagerung einer den Innenraum des Schalldämpfergehäuses in zwei Kammern unterteilenden Innenplatte einander gegenüberliegend positioniert und miteinander durch Laserschweißen verbunden. Die Innenplatte bildet zusammen mit einer der Gehäuseschalen einen Eintrittsbereich, über welchen Abgas in eine der Kammern einströmt. Die Innenplatte bildet zusammen mit der anderen der beiden Gehäuseschalen einen Austrittsbereich, über welchen Abgas aus der anderen der beiden Kammern austritt. Über eine Mehrzahl von in der Innenplatte ausgebildeten Öffnungen sind die beiden Kammern in Verbindung miteinander.From the EP 1 512 852 B1 a silencer for an exhaust system of an internal combustion engine is known according to the preamble of claim 1, the silencer housing of which is constructed with two housing shells formed by forming sheet metal material. The two housing shells each have a curved shell body and a housing shell peripheral edge with a contact surface that protrudes outwards from this. The housing shell peripheral edges of the two housing shells are positioned opposite one another below an intermediate storage of an inner plate that divides the interior of the silencer housing into two chambers and are connected to one another by laser welding. The inner plate, together with one of the housing shells, forms an inlet area through which exhaust gas flows into one of the chambers. The inner plate, together with the other of the two housing shells, forms an outlet area through which exhaust gas exits the other of the two chambers. The two chambers are connected to one another via a plurality of openings formed in the inner plate.

In diejenige der beiden Kammern, in welche das Abgas über den Eintrittsbereich eintritt ist eine die Innenoberfläche der diese Kammer nach außen begrenzenden Gehäuseschalen überdeckende Lage einer Wärmeisolierung aus hochdichtem Fasermaterial eingelegt. Die Wärmeisolierung kann an wenigstens einer Seite mit einer Folie aus rostfreiem Stahl überzogen sein. In der Kammer, welche durch die Wärmeisolierung bezüglich der diese Kammer begrenzenden Gehäuseschale thermisch isoliert ist, ist weiterhin Fasermaterial mit geringerer Faserdichte als diejenige der Wärmeisolierung untergebracht.In the chamber into which the exhaust gas enters via the inlet area, a layer of thermal insulation made of high-density fiber material is placed, covering the inner surface of the housing shells that delimit this chamber on the outside. The thermal insulation can be covered on at least one side with a stainless steel foil. In the chamber that is thermally insulated by the thermal insulation with respect to the housing shell that delimits this chamber, fiber material with a lower fiber density than that of the thermal insulation is also housed.

Ein Schalldämpfer gemäß dem Oberbegriff des Anspruchs 1 ist aus der US 2008/0127639 A1 bekannt. Bei diesem Schalldämpfer sind eine Isolierschale und eine ein Abgasströmungsvolumen im Schalldämpferinnenraum in zwei Kammern unterteilende Zwischenwand mit jeweiligen Verbindungsrändern zwischen den Gehäuseschalen-Verbindungsrändern zweier Gehäuseschalen angeordnet und mit diesen fest verbunden. Ein Einlassrohr und ein Auslassrohr sind an in jeweils einer der beiden Gehäuseschalen ausgebildete Öffnungen angebunden.A silencer according to the preamble of claim 1 is known from US 2008/0127639 A1 This silencer has an insulating shell and an intermediate wall dividing an exhaust gas flow volume in the silencer interior into two chambers with respective connecting edges is arranged between the housing shell connecting edges of two housing shells and is firmly connected to them. An inlet pipe and an outlet pipe are connected to openings formed in one of the two housing shells.

Die FR 1,244,433 A offenbart einen Schalldämpfer, bei welchem in einem rohrartigen und mit zwei Gehäuseschalen aufgebauten äußeren Gehäuse ein mit zwei Gehäuseschalen aufgebautes inneres Gehäuse angeordnet ist. Das innere Gehäuse ist mit Verbindungsrändern von einer der beiden Gehäuseschalen desselben zwischen Verbindungsrändern der äußeren Gehäuseschalen aufgenommen und mit diesen fest verbunden.The FR 1,244,433 A discloses a silencer in which an inner housing constructed with two housing shells is arranged in a tubular outer housing constructed with two housing shells. The inner housing is received with connecting edges of one of the two housing shells between connecting edges of the outer housing shells and is firmly connected to them.

Die US 5,907,135 A offenbart einen Schalldämpfer, bei welchem ein rohartiges äußeres Gehäuse mit zwei Gehäuseschalen aufgebaut ist, die im Bereich jeweiliger Verbindungsränder miteinander verbunden sind. Ein rohrartiges inneres Gehäuse ist ebenfalls mit zwei Gehäuseschalen aufgebaut und mit jeweiligen Verbindungsrändern derselben zwischen den Verbindungsrändern der äußeren Gehäuseschalen aufgenommen.The US 5,907,135 A discloses a silencer in which a tubular outer housing is constructed with two housing shells which are connected to one another in the region of respective connecting edges. A tubular inner housing is also constructed with two housing shells and is received with respective connecting edges thereof between the connecting edges of the outer housing shells.

Die JP H06-221147 A offenbart einen Schalldämpfer, bei welchem zwischen einer von zwei äußeren Gehäuseschalen und einer mit dieser ein Abgasströmungsvolumen begrenzenden inneren Gehäuseschale eine Zwischenwand angeordnet und mit diesen durch Verschweißen fest verbunden ist.The JP H06-221147 A discloses a silencer in which an intermediate wall is arranged between one of two outer housing shells and an inner housing shell which delimits an exhaust gas flow volume with the latter and is firmly connected to them by welding.

Es ist die Aufgabe der vorliegenden Erfindung, einen Schalldämpfer für eine Abgasanlage einer Brennkraftmaschine vorzusehen, welcher bei baulich einfacher und einfach herzustellender Ausgestaltung eine thermische Isolierung eines Schalldämpfergehäuses ermöglicht.It is the object of the present invention to provide a silencer for an exhaust system of an internal combustion engine, which enables thermal insulation of a silencer housing with a structurally simple and easy-to-manufacture design.

Erfindungsgemäß wird diese Aufgabe gelöst durch einen Schalldämpfer für eine Abgasanlage einer Brennkraftmaschine gemäß Anspruch 1. Dieser Schalldämpfer umfasst ein Schalldämpfergehäuse mit wenigstens zwei einen Schalldämpferinnenraum umgrenzenden und miteinander verbundenen Gehäuseschalen, wobei jede Gehäuseschale einen sich in Richtung von dem Schalldämpferinnenraum weg erstreckenden Gehäuseschalen-Verbindungsrand aufweist und die Gehäuseschalen im Bereich ihrer einander gegenüberliegend angeordneten Gehäuseschalen-Verbindungsränder miteinander durch Materialschluss verbunden sind, und wobei in dem Schalldämpferinnenraum eine eine Innenseite von wenigstens einer Gehäuseschale der Gehäuseschalen wenigstens bereichsweise überdeckende Isolieranordnung vorgesehen ist.According to the invention, this object is achieved by a silencer for an exhaust system of an internal combustion engine according to claim 1. This silencer comprises a silencer housing with at least two Housing shells which delimit the silencer interior and are connected to one another, wherein each housing shell has a housing shell connecting edge which extends in the direction away from the silencer interior and the housing shells are connected to one another by material bonding in the region of their housing shell connecting edges which are arranged opposite one another, and wherein an insulating arrangement which at least partially covers an inner side of at least one housing shell of the housing shells is provided in the silencer interior.

Bei dem erfindungsgemäßen Schalldämpfer weist die Isolieranordnung wenigstens eine Isolierschale mit einem sich in Richtung vom Schalldämpferinnenraum weg erstreckenden Isolierschalen-Verbindungsrand auf, und die wenigstens eine Isolierschale ist mit ihrem Isolierschalen-Verbindungsrand zwischen den einander gegenüberliegend angeordneten Gehäuseschalen-Verbindungsrändern der Gehäuseschalen angeordnet und ist im Bereich des Isolierschalen-Verbindungsrands mit den Gehäuseschalen-Verbindungsrändern der Gehäuseschalen durch Materialschluss verbunden.In the silencer according to the invention, the insulation arrangement has at least one insulation shell with an insulation shell connecting edge extending in the direction away from the silencer interior, and the at least one insulation shell is arranged with its insulation shell connecting edge between the housing shell connecting edges of the housing shells arranged opposite one another and is connected in the region of the insulation shell connecting edge to the housing shell connecting edges of the housing shells by material bonding.

Bei dem erfindungsgemäß aufgebauten Schalldämpfer wird durch den Einsatz von zumindest drei schalenartig aufgebauten und miteinander zu verbindenden Bauteilen, nämlich den Gehäuseschalen und der Isolierschale, ein stabiler, einfach und kostengünstig herzustellender Aufbau erreicht, bei welchem der feste und insbesondere auch gegen den Austritt von Abgas dichte Verbund von drei schalenartig aufgebauten Bauteilen durch einen diese drei Bauteile einbeziehenden Materialschluss erzeugt wird. Weitere Maßnahmen sind zur Integration einer thermischen Isolierung für zumindest eine der beiden den Schalldämpferinnenraum umgrenzenden Gehäuseschalen nicht erforderlich.In the silencer constructed according to the invention, a stable, simple and cost-effective structure is achieved by using at least three shell-like components that are to be connected to one another, namely the housing shells and the insulating shell, in which the solid and, in particular, tight connection against the escape of exhaust gases is created by a material connection that includes these three components. Further measures are not required to integrate thermal insulation for at least one of the two housing shells that enclose the silencer interior.

Der den Isolierschalen-Verbindungsrand mit den Gehäuseschalen-Verbindungsrändern der Gehäuseschalen verbindende Materialschluss kann eine entlang der Gehäuseschalen-Verbindungsränder und des Isolierschalen-Verbindungsrands vorzugsweise im Wesentlichen unterbrechungsfrei verlaufende Schweißnaht umfassen. Mit dieser einzigen Dreikörpernaht wird beispielsweise in einem einzigen Schweißvorgang die feste Verbindung der drei schalenartig aufgebauten Bauteile des Schalldämpfers erreicht.The material connection connecting the insulation shell connection edge with the housing shell connection edges of the housing shells can comprise a weld seam that preferably runs essentially uninterrupted along the housing shell connection edges and the insulation shell connection edge. This single three-body weld is used, for example, in A single welding process achieves a firm connection between the three shell-like components of the silencer.

Zur Bereitstellung eines ausreichend großen Volumens des Schalldämpferinnenraums kann wenigstens die wenigstens eine Gehäuseschale der Gehäuseschalen, vorzugsweise jede Gehäuseschale, einen von deren Gehäuseschalen-Verbindungsrand umgebenen, den Schalldämpferinnenraum umgrenzenden, gewölbten Gehäuseschalenkörper umfassen, und die wenigstens eine Isolierschale kann einen von deren Isolierschalen-Verbindungsrand umgebenen, gewölbten Isolierschalenkörper umfassen.In order to provide a sufficiently large volume of the silencer interior, at least the at least one housing shell of the housing shells, preferably each housing shell, can comprise a curved housing shell body surrounded by its housing shell connecting edge and delimiting the silencer interior, and the at least one insulating shell can comprise a curved insulating shell body surrounded by its insulating shell connecting edge.

Zum Vermeiden von Anschlaggeräusche und zum Bereitstellen einer guten thermischen Isolierung wird vorgeschlagen, dass der Isolierschalenkörper und der Gehäuseschalenkörper der wenigstens einen Gehäuseschale der Gehäuseschalen zueinander in Abstand angeordnet sind. Somit wird zwischen dem Isolierschalenkörper und dem Gehäuseschalenkörper der wenigstens einen Gehäuseschale der Gehäuseschalen ein spaltartiger Zwischenraum gebildet, welcher mit dem darin sich ansammelnden Gas eine Isolierschicht bereitstellt. Es ist darauf hinzuweisen, dass unter Beibehalt eines derartigen Zwischenraums der Isolierschalenkörper und der Gehäuseschalenkörper der wenigstens einen Gehäuseschale der Gehäuseschalen lokal beispielsweise im Bereich von daran vorgesehenen Ausformungen aneinander anliegen können, um eine definierte gegenseitige Abstützung zu erreichen. In derartigen Bereichen können diese Schalenkörper beispielsweise durch Verschweißung fest miteinander verbunden sein.To avoid impact noises and to provide good thermal insulation, it is proposed that the insulating shell body and the housing shell body of the at least one housing shell of the housing shells are arranged at a distance from one another. A gap-like intermediate space is thus formed between the insulating shell body and the housing shell body of the at least one housing shell of the housing shells, which provides an insulating layer with the gas accumulating therein. It should be noted that while maintaining such an intermediate space, the insulating shell body and the housing shell body of the at least one housing shell of the housing shells can lie against one another locally, for example in the region of formations provided thereon, in order to achieve defined mutual support. In such regions, these shell bodies can be firmly connected to one another, for example by welding.

Eine einfach und kostengünstig herstellbare und insbesondere für die Durchführung eines Schweißvorgangs sich besonders eignende Ausgestaltung kann dadurch vorgesehen werden, dass die Gehäuseschalen und die Isolierschale durch Blechumformteile bereitgestellt sind.A design which is simple and cost-effective to produce and is particularly suitable for carrying out a welding process can be provided by providing the housing shells and the insulating shell by formed sheet metal parts.

Zur definierten Strömungsführung im Schalldämpferinnenraum ist zwischen der Isolierschale und einer anderen Gehäuseschale der Gehäuseschalen ein Abgasströmungsvolumen gebildet sein, wobei das Abgasströmungsvolumen durch wenigstens eine Zwischenwand in eine Mehrzahl von Kammern unterteilt ist. Dabei ist wenigstens eine Zwischenwand zwischen der Isolierschale und der anderen Gehäuseschale der Gehäuseschalen eingespannt gehalten. Auf diese Art und Weise sind keine zusätzlichen Maßnahmen erforderlich, um eine derartige Zwischenwand im Schalldämpferinnenraum in einer vorgegebenen Einbaulage zu halten. Ferner wird durch die Einspannung einer oder mehrerer derartiger Zwischenwände auch eine definierte Verspannung der Isolierschale bezüglich der Gehäuseschalen erreicht, so dass die Entstehung von zu Geräuschen oder Beschädigungen im Schalldämpfer führenden Schwingungsanregungen insbesondere der Isolierschale praktisch ausgeschlossen werden kann.For defined flow guidance in the silencer interior, a Exhaust gas flow volume can be formed, wherein the exhaust gas flow volume is divided into a plurality of chambers by at least one intermediate wall. At least one intermediate wall is clamped between the insulating shell and the other housing shell of the housing shells. In this way, no additional measures are required to hold such an intermediate wall in a predetermined installation position in the silencer interior. Furthermore, by clamping one or more such intermediate walls, a defined bracing of the insulating shell with respect to the housing shells is achieved, so that the occurrence of vibration excitations leading to noise or damage in the silencer, in particular of the insulating shell, can be practically excluded.

Um bei dem Schalldämpfer ein definiertes Schalldämpfungsverhalten einstellen zu können, wird vorgeschlagen, dass die wenigstens eine Isolierschale sich von einem Längsendbereich des Schalldämpfergehäuses bis zu einer Zwischenwand erstreckt und die wenigstens eine Gehäuseschale der Gehäuseschalen an deren Innenseite in einem zwischen dem einen Längsendbereich des Schalldämpfergehäuses und der Zwischenwand sich erstreckenden Bereich überdeckt, und dass in einem zwischen der Zwischenwand und dem anderen Längsendbereich des Schalldämpfergehäuses sich erstreckenden Bereich die wenigstens eine Gehäuseschale der Gehäuseschalen an deren Innenseite nicht von der wenigstens einen Isolierschale überdeckt ist. Weiter kann hierzu vorgesehen sein, dass zwischen der Zwischenwand und dem anderen Längsendbereich des Schalldämpfergehäuses eine wenigstens teilweise mit Schalldämmungsmaterial gefüllte Kammer gebildet ist.In order to be able to set a defined sound damping behavior in the silencer, it is proposed that the at least one insulating shell extends from a longitudinal end region of the silencer housing to an intermediate wall and covers the at least one housing shell of the housing shells on its inner side in an area extending between the one longitudinal end region of the silencer housing and the intermediate wall, and that in an area extending between the intermediate wall and the other longitudinal end region of the silencer housing, the at least one housing shell of the housing shells is not covered on its inner side by the at least one insulating shell. Furthermore, it can be provided for this purpose that a chamber at least partially filled with sound insulation material is formed between the intermediate wall and the other longitudinal end region of the silencer housing.

Zum Einleiten von Abgas in den Schalldämpfer und zum Ausleiten von Abgas aus dem Schalldämpfer sind wenigstens ein zu dem Schalldämpferinnenraum offenes Abgaseinlassrohr und wenigstens ein zu dem Schalldämpferinnenraum offenes Abgasauslassrohr vorgesehen. Um einen festen Anschluss dieser Rohre an das Schalldämpfergehäuse zu erreichen, wird vorgeschlagen, dass wenigstens ein Rohr von Abgaseinlassrohr und Abgasauslassrohr mit dem Schalldämpfergehäuse im Bereich einer zwischen dem Isolierschalen-Verbindungsrand und dem Gehäuseschalen-Verbindungsrand der anderen Gehäuseschale der Gehäuseschalen gebildeten Rohraufnahmeöffnung mit dem Schalldämpfergehäuse vorzugsweise durch Materialschluss verbunden ist. Weiter kann ein Rohr von Abgaseinlassrohr und Abgasauslassrohr mit dem Schalldämpfergehäuse im Bereich einer zwischen den Gehäuseschalen-Verbindungsrändern zweier Gehäuseschalen gebildeten Rohraufnahmeöffnung mit dem Schalldämpfergehäuse vorzugsweise durch Materialschluss verbunden sein.To introduce exhaust gas into the silencer and to discharge exhaust gas from the silencer, at least one exhaust gas inlet pipe open to the silencer interior and at least one exhaust gas outlet pipe open to the silencer interior are provided. In order to achieve a firm connection of these pipes to the silencer housing, it is proposed that at least one pipe of the exhaust gas inlet pipe and exhaust gas outlet pipe is connected to the silencer housing in the region of a pipe receiving opening formed between the insulating shell connecting edge and the housing shell connecting edge of the other housing shell of the housing shells, preferably by material bonding. Furthermore, a pipe of the exhaust gas inlet pipe and exhaust gas outlet pipe can be connected to the silencer housing in the region of a pipe receiving opening formed between the housing shell connecting edges of two housing shells, preferably by material bonding.

Die Erfindung betrifft ferner eine Abgasanlage für eine Brennkraftmaschine, insbesondere in einem Kraftfahrzeug, umfassend wenigstens einen Schalldämpfer nach einem der vorangehenden Ansprüche.The invention further relates to an exhaust system for an internal combustion engine, in particular in a motor vehicle, comprising at least one silencer according to one of the preceding claims.

Die vorliegende Erfindung wird nachfolgend mit Bezug auf die beiliegenden Figuren detailliert beschrieben. Es zeigt:

Fig. 1
eine Seitenansicht eines Schalldämpfers für eine Abgasanlage in einem Kraftfahrzeug;
Fig. 2
eine Draufsicht auf den Schalldämpfer der Fig. 1 in Blickrichtung II bei entfernter oberer Gehäuseschale;
Fig. 3
eine Explosionsdarstellung des Schalldämpfers der Fig. 1;
Fig. 4
eine vergrößerte Darstellung des Details IV in Fig. 1, welche die Verbindung der beiden Gehäuseschalen des Schalldämpfers der Fig. 1 mit einer Isolierschale veranschaulicht.
The present invention is described in detail below with reference to the accompanying figures.
Fig.1
a side view of a silencer for an exhaust system in a motor vehicle;
Fig. 2
a top view of the silencer of the Fig.1 in viewing direction II with the upper housing shell removed;
Fig. 3
an exploded view of the silencer of the Fig.1 ;
Fig.4
an enlarged view of detail IV in Fig.1 , which connects the two housing shells of the silencer of the Fig.1 illustrated with an insulating shell.

Die Fig. 1 bis 3 zeigen einen allgemein mit 10 bezeichneten Schalldämpfer für eine Abgasanlage 12 einer Brennkraftmaschine in einem Fahrzeug. Der Schalldämpfer 10 umfasst ein Schalldämpfergehäuse 14 mit einer Gehäuseschale 16 und einer Gehäuseschale 18. Jede der als Blechumformteile bereitgestellten Gehäuseschalen 16, 18 weist einen bezüglich eines von den Gehäuseschalen 16, 18 umgrenzten Schalldämpferinnenraums 20 nach außen gewölbten Gehäuseschalenkörper 22, 24 auf. Jeder Gehäuseschalenkörper 22, 24 ist von einem bezüglich des Schalldämpferinnenraums 20 nach außen sich erstreckenden Gehäuseschalen-Verbindungsrand 26, 28 umgeben. Die beiden Gehäuseschalen 16, 18 liegen mit ihren Gehäuseschalen-Verbindungsrändern 26, 28 einander gegenüber und sind im Bereich der Gehäuseschalen-Verbindungsränder 26, 28 in nachfolgend beschriebener Art und Weise verbunden.The Fig. 1 to 3 show a silencer, generally designated 10, for an exhaust system 12 of an internal combustion engine in a vehicle. The silencer 10 comprises a silencer housing 14 with a housing shell 16 and a housing shell 18. Each of the housing shells 16, 18 provided as sheet metal formed parts has a housing shell body 22, 24 curved outwards with respect to a silencer interior 20 delimited by the housing shells 16, 18. Each housing shell body 22, 24 is surrounded by a housing shell connecting edge 26, 28 extending outwards with respect to the silencer interior 20. The two housing shells 16, 18 lie opposite one another with their housing shell connecting edges 26, 28 and are connected in the region of the housing shell connecting edges 26, 28 in the manner described below.

In dem von den beiden Gehäuseschalen 16, 18 umgrenzten Schalldämpferinnenraum 20 ist eine durch eine als Blechumformteil ausgebildete Isolierschale 30 bereitgestellte Isolieranordnung 32 vorgesehen. Die Isolierschale 30 weist einen gewölbten Isolierschalenkörper 34 und einen diesen umgebenden Isolierschalen-Verbindungsrand 36. Auch der Isolierschalen-Verbindungsrand 36 erstreckt sich bezüglich des Schalldämpferinnenraums 20 nach außen und liegt im Zusammenbauzustand zwischen den Gehäuseschalen-Verbindungsrändern 26, 28.An insulating arrangement 32 provided by an insulating shell 30 designed as a formed sheet metal part is provided in the silencer interior 20 delimited by the two housing shells 16, 18. The insulating shell 30 has a curved insulating shell body 34 and an insulating shell connecting edge 36 surrounding it. The insulating shell connecting edge 36 also extends outwards with respect to the silencer interior 20 and lies between the housing shell connecting edges 26, 28 in the assembled state.

In Fig. 3 ist zu erkennen, dass der Isolierschalenkörper 30 hinsichtlich seiner Wölbung an die Wölbung der Gehäuseschale 18 angepasst ist. Im Zusammenbauzustand liegt der in seiner Formgebung im Wesentlichen an die Formgebung des gewölbten Gehäuseschalenkörpers 24 der Gehäuseschale 18 angepasste Isolierschalenkörper 34 der Isolierschale 30 bei zwischen den Gehäuseschalen-Verbindungsrändern 26, 28 positioniertem Isolierschalen-Verbindungsrand 36 in Abstand zum Gehäuseschalenkörper 24, so dass zwischen dem Isolierschalenkörper 34 und dem Gehäuseschalenkörper 24 ein spaltartiger Zwischenraum 38 gebildet ist.In Fig. 3 it can be seen that the insulating shell body 30 is adapted to the curvature of the housing shell 18 in terms of its curvature. In the assembled state, the insulating shell body 34 of the insulating shell 30, whose shape is essentially adapted to the shape of the curved housing shell body 24 of the housing shell 18, is spaced apart from the housing shell body 24 when the insulating shell connecting edge 36 is positioned between the housing shell connecting edges 26, 28, so that a gap-like intermediate space 38 is formed between the insulating shell body 34 and the housing shell body 24.

Die Isolierschale 30 erstreckt sich in dem von den Gehäuseschalen 16, 18 umgrenzten Gehäuseschaleninnenraum 20 von einem ersten Längsendbereich 40 des Schalldämpfergehäuses 14 bis zu einer von drei im Schalldämpferinnenraum 20 angeordneten Zwischenwänden 42, 44, 46. In dem zwischen dem ersten Längsendbereich 40 des Schalldämpfergehäuses 14 liegenden Bereich und der Zwischenwand 42 überdeckt die Isolierschale 30 eine Innenseite 48 der Gehäuseschale 18 unter Beibehalt des Zwischenraums 38.The insulating shell 30 extends in the housing shell interior 20 delimited by the housing shells 16, 18 from a first longitudinal end region 40 of the silencer housing 14 to one of three intermediate walls 42, 44, 46 arranged in the silencer interior 20. In the area between the first Between the longitudinal end region 40 of the silencer housing 14 and the intermediate wall 42, the insulating shell 30 covers an inner side 48 of the housing shell 18 while maintaining the intermediate space 38.

Durch die Zwischenwände 42, 44, 46 wird der Schalldämpferinnenraum 20 in vier Kammern 50, 52, 54, 56 unterteilt. Die Kammer 50 erstreckt sich im Wesentlichen zwischen der Zwischenwand 42 und einem zweiten Längsendbereich 58 des Schalldämpfergehäuses 40. Die Kammer 52 liegt im Wesentlichen zwischen den beiden Zwischenwänden 42, 44. Die Kammer 54 liegt im Wesentlichen zwischen den beiden Zwischenwänden 44, 46, und die Kammer 56 erstreckt sich im Wesentlichen zwischen der Zwischenwand 46 und dem ersten Längsendbereich 40 des Schalldämpfergehäuses 14. Durch in den Zwischenwänden 42, 44, 46 vorgesehene Öffnungen stehen die Kammern 50, 52, 54, 56 in Verbindung miteinander.The intermediate walls 42, 44, 46 divide the silencer interior 20 into four chambers 50, 52, 54, 56. The chamber 50 extends essentially between the intermediate wall 42 and a second longitudinal end region 58 of the silencer housing 40. The chamber 52 lies essentially between the two intermediate walls 42, 44. The chamber 54 lies essentially between the two intermediate walls 44, 46, and the chamber 56 extends essentially between the intermediate wall 46 and the first longitudinal end region 40 of the silencer housing 14. The chambers 50, 52, 54, 56 are connected to one another through openings provided in the intermediate walls 42, 44, 46.

Die Zwischenwände 44, 46 liegen in demjenigen Bereich, in welchem die Isolierschale 30 die Innenseite 48 der Gehäuseschale 18 überdeckt. Dadurch ist ein direkter Kontakt zwischen den Zwischenwänden 44, 46 und der Gehäuseschale 18 nicht möglich. Die Zwischenwände 44, 46 sind daher zwischen der Isolierschale 30 und der Gehäuseschale 16 gehalten. Hierzu können an der Isolierschale 30 einerseits und der Gehäuseschale 16 andererseits nach innen hervorstehende, einander paarweise zugeordnete rippenartige Ausformungen gebildet sein, zwischen welchen die Zwischenwände 44, 46 fest gehalten und somit in allen Bewegungsrichtungen zwischen der Isolierschale 30 und der Gehäuseschale 16 eingespannt sind.The intermediate walls 44, 46 are located in the area in which the insulating shell 30 covers the inside 48 of the housing shell 18. As a result, direct contact between the intermediate walls 44, 46 and the housing shell 18 is not possible. The intermediate walls 44, 46 are therefore held between the insulating shell 30 and the housing shell 16. For this purpose, rib-like formations that protrude inwards and are assigned to one another in pairs can be formed on the insulating shell 30 on the one hand and the housing shell 16 on the other hand, between which the intermediate walls 44, 46 are held firmly and are thus clamped in all directions of movement between the insulating shell 30 and the housing shell 16.

Die Zwischenwand 42 kann so positioniert sein, dass sie in Richtung vom ersten Längsendbereich 40 zum zweiten Längsendbereich 58 des Schalldämpfergehäuses 14 an die Isolierschale 30 anschließt und somit zwischen den Gehäuseschalen 16, 18 im Bereich von daran einander paarweise zugeordnet vorgesehenen, nach innen hervorstehenden rippenartigen Ausformungen gehalten ist. Um durch gegenseitiges Anschlagen möglicherweise entstehende Geräusche zu vermeiden, kann zwischen dem der Zwischenwand 42 nahe liegenden Endbereich 60 der Isolierschale 30 und der Zwischenwand 42 ein spaltartiger Zwischenraum gebildet sein. Es ist darauf hinzuweisen, dass alternativ auch die Zwischenwand 42 zwischen der Gehäuseschale 16 und der Isolierschale 30 gehalten sein könnte, wenn beispielsweise an der Isolierschale 30 auch in Zuordnung zu der Zwischenwand 42 zwei diese zwischen sich aufnehmende und nach innen vorstehende rippenartige Ausformungen vorgesehen sind.The intermediate wall 42 can be positioned in such a way that it adjoins the insulating shell 30 in the direction from the first longitudinal end region 40 to the second longitudinal end region 58 of the silencer housing 14 and is thus held between the housing shells 16, 18 in the region of rib-like formations provided thereon in pairs and projecting inwards. In order to avoid noises that may arise from mutual impact, a gap-like intermediate space can be formed between the end region 60 of the insulating shell 30 that is close to the intermediate wall 42 and the intermediate wall 42. It is important to note that It should be pointed out that, alternatively, the intermediate wall 42 could also be held between the housing shell 16 and the insulating shell 30 if, for example, two rib-like formations are provided on the insulating shell 30 in association with the intermediate wall 42, which receive the latter between them and project inwards.

Der Schalldämpfer 10 umfasst ferner ein Einlassrohr 62 sowie ein Auslassrohr 64. Das Einlassrohr 62 führt im Bereich einer am Schalldämpfergehäuse 14 gebildeten Rohraufnahmeöffnung 66 in den Schalldämpferinnenraum 20 und durchsetzt die Zwischenwände 44, 46. In seinem zwischen den Zwischenwänden 44, 46 liegenden Längenbereich weist das Einlassrohr 62 eine Perforation 68 auf, über welche das Einlassrohr 62 zur Kammer 54 offen ist. An seinem im Schalldämpferinnenraum 20 liegenden Ende ist das Einlassrohr 62 zur Kammer 56 offen.The silencer 10 further comprises an inlet pipe 62 and an outlet pipe 64. The inlet pipe 62 leads into the silencer interior 20 in the region of a pipe receiving opening 66 formed on the silencer housing 14 and passes through the partition walls 44, 46. In its length region lying between the partition walls 44, 46, the inlet pipe 62 has a perforation 68, via which the inlet pipe 62 is open to the chamber 54. At its end lying in the silencer interior 20, the inlet pipe 62 is open to the chamber 56.

Das Auslassrohr 64 führt im Bereich einer Rohraufnahmeöffnung 70 in den Schalldämpferinnenraum 20 und durchsetzt die Zwischenwände 42, 44, 46. Im Bereich der Kammer 56 ist das Auslassrohr 64 an seinem im Schalldämpferinnenraum 20 liegenden Ende zur Kammer 56 offen.The outlet pipe 64 leads into the silencer interior 20 in the region of a pipe receiving opening 70 and passes through the intermediate walls 42, 44, 46. In the region of the chamber 56, the outlet pipe 64 is open to the chamber 56 at its end located in the silencer interior 20.

In seinem die Kammer 50 durchsetzenden Längenbereich erstreckt das Auslassrohr 64 sich durch in der Kammer 50 angeordnetes Schalldämmungsmaterial 72 hindurch. Dieses kann blockartig ausgebildet sein und mit geschäumtem oder faserartigem Material aufgebaut sein. Alternativ könnte das Schalldämmungsmaterial 72 auch als Auskleidung ausgebildet sein, welche, ohne das gesamte Volumen oder im Wesentlichen das gesamte Volumen der Kammer 50 zu belegen, die Gehäuseschalen 16, 18 im Bereich der Kammer 50 an deren jeweiliger Innenseite überdeckt.In its length region passing through the chamber 50, the outlet pipe 64 extends through the soundproofing material 72 arranged in the chamber 50. This can be designed in block form and made of foamed or fibrous material. Alternatively, the soundproofing material 72 could also be designed as a lining which, without occupying the entire volume or essentially the entire volume of the chamber 50, covers the housing shells 16, 18 in the region of the chamber 50 on their respective insides.

Die Rohraufnahmeöffnung 66 für das Einlassrohr 62 liegt in demjenigen Bereich des Schalldämpfergehäuses 14, in welchem die Isolierschale 30 die Gehäuseschale 18 an ihrer Innenseite 48 überdeckt. Daher ist die Rohraufnahmeöffnung 66 im Wesentlichen zwischen dem Gehäuseschalen-Verbindungsrand 26 der Gehäuseschale 16 und dem Isolierschalen-Verbindungsrand 36 der Isolierschale 30 gebildet.The pipe receiving opening 66 for the inlet pipe 62 is located in that area of the silencer housing 14 in which the insulating shell 30 covers the housing shell 18 on its inner side 48. Therefore, the pipe receiving opening 66 is essentially between the housing shell connection edge 26 of the Housing shell 16 and the insulating shell connecting edge 36 of the insulating shell 30.

Während die Rohraufnahmeöffnung 66 für das Einlassrohr 62 im Wesentlichen mittig zwischen den beiden Längsendbereichen 40, 58 des Schalldämpfergehäuses 14 positioniert ist, ist die Rohraufnahmeöffnung 70 für das Auslassrohr 64 am zweiten Längsendbereich 58 des Schalldämpfergehäuses 14 vorgesehen und liegt somit in einem Bereich, in welchem die Gehäuseschale 18 nicht von der Isolierschale 30 überdeckt ist und daher der Isolierschalen-Verbindungsrand 36 nicht zwischen den Gehäuseschalen-Verbindungsrändern 26, 28 positioniert ist. Die Rohraufnahmeöffnung 70 für das Auslassrohr 64 ist daher zwischen den Gehäuseschalen-Verbindungsrändern 26, 28 der Gehäuseschalen 16, 18 gebildet.While the pipe receiving opening 66 for the inlet pipe 62 is positioned substantially centrally between the two longitudinal end regions 40, 58 of the silencer housing 14, the pipe receiving opening 70 for the outlet pipe 64 is provided at the second longitudinal end region 58 of the silencer housing 14 and is thus located in a region in which the housing shell 18 is not covered by the insulating shell 30 and therefore the insulating shell connecting edge 36 is not positioned between the housing shell connecting edges 26, 28. The pipe receiving opening 70 for the outlet pipe 64 is therefore formed between the housing shell connecting edges 26, 28 of the housing shells 16, 18.

Beim Zusammenbau des Schalldämpfers 10 kann zunächst ein Schalldämpfereinsatz 74 aufgebaut werden, welcher die Zwischenwände 42, 44, 46, das Schalldämmungsmaterial 72, das die Zwischenwände 44, 46 durchsetzende Einlassrohr 62 und das das Schalldämmungsmaterial 72 sowie die Zwischenwände 42, 44, 46 durchsetzende Auslassrohr 64 umfasst. Zum Herstellen eines festen Verbundes können beispielsweise das Einlassrohr 62 und das Auslassrohr 64 mit dem von diesen durchsetzten Zwischenwänden 42, 44, 46 durch Materialschluss, beispielsweise Verschweißen, oder/und durch Presspassung verbunden werden. Nachfolgend kann dieser Schalldämpfereinsatz 74 beispielsweise in diejenige der Gehäuseschalen 16, 18 eingelegt werden, welche nicht an ihrer Innenseite von der Isolierschale 30 überdeckt ist. Im dargestellten Beispiel ist dies die Gehäuseschale 16. Nach dem Positionieren des Schalldämpfereinsatzes 74 beispielsweise in der Gehäuseschale 16 kann zunächst die Isolierschale 30 auf den Schalldämpfereinsatz 74 aufgesetzt werden, so dass sie mit ihrem Isolierschalen-Verbindungsrand 36 den Gehäuseschalen-Verbindungsrand 26 der Gehäuseschale 16 bereichsweise überdeckt und zusammen mit dem Gehäuseschalen-Verbindungsrand 26 mit ihrem Isolierschalen-Verbindungsrand 36 das Einlassrohr 62 im Bereich der Rohraufnahmeöffnung 66 umgibt.When assembling the silencer 10, a silencer insert 74 can first be constructed, which comprises the partition walls 42, 44, 46, the soundproofing material 72, the inlet pipe 62 passing through the partition walls 44, 46, and the outlet pipe 64 passing through the soundproofing material 72 and the partition walls 42, 44, 46. To produce a solid connection, for example, the inlet pipe 62 and the outlet pipe 64 can be connected to the partition walls 42, 44, 46 passed through by them by means of a material bond, for example welding, and/or by means of a press fit. This silencer insert 74 can then be inserted, for example, into the housing shell 16, 18 which is not covered on its inside by the insulating shell 30. In the example shown, this is the housing shell 16. After positioning the silencer insert 74, for example in the housing shell 16, the insulating shell 30 can first be placed on the silencer insert 74 so that it partially covers the housing shell connecting edge 26 of the housing shell 16 with its insulating shell connecting edge 36 and, together with the housing shell connecting edge 26 with its insulating shell connecting edge 36, surrounds the inlet pipe 62 in the region of the pipe receiving opening 66.

In einem nächsten Arbeitsschritt kann die andere Gehäuseschale, im dargestellten Beispiel also die Gehäuseschale 18, aufgesetzt werden, so dass diese die Isolierschale 30 bzw. die Gehäuseschale 16 und den bereits an der Gehäuseschale 16 positionierten Schalldämpfereinsatz 74 überdeckt. Der Gehäuseschalen-Verbindungsrand 18 der Gehäuseschale 18 liegt in diesem Zustand dann in demjenigen Bereich, in welchem die Isolierschale 30 mit ihrem Isolierschalen-Verbindungsrand 36 den Gehäuseschalen-Verbindungsrand 26 der Gehäuseschale 16 überdeckt, auf dem Isolierschalen-Verbindungsrand 36, und liegt in demjenigen Bereich, in welchem der Gehäuseschalen-Verbindungsrand 26 nicht vom Isolierschalen-Verbindungsrand 36 überdeckt ist, den Gehäuseschalen-Verbindungsrand 26 der Gehäuseschale 16 direkt gegenüber bzw. auf diesem auf. Um in diesem Bereich das Entstehen eines spaltartigen Zwischenraums zu vermeiden, kann in zumindest einer der Gehäuseschalen 16, 18 im Bereich von deren Gehäuseschalen-Verbindungsrand 26, 28 ein stufenartiger Übergang zu einem zurückversetzten Bereich des jeweiligen Gehäuseschalen-Verbindungsrands gebildet sein, um in demjenigen Bereich, in welchem der Isolierschalen-Verbindungsrand 36 zwischen den Gehäuseschalen-Verbindungsrändern 26, 28 zu positionieren ist, ausreichend Aufnahmeraum für die Isolierschalen-Verbindungsrand 36 zu erzeugen.In a next step, the other housing shell, in the example shown, the housing shell 18, can be placed on top so that it covers the insulating shell 30 or the housing shell 16 and the silencer insert 74 already positioned on the housing shell 16. In this state, the housing shell connecting edge 18 of the housing shell 18 then lies on the insulating shell connecting edge 36 in the area in which the insulating shell 30 with its insulating shell connecting edge 36 covers the housing shell connecting edge 26 of the housing shell 16, and lies directly opposite or on the housing shell connecting edge 26 of the housing shell 16 in the area in which the housing shell connecting edge 26 is not covered by the insulating shell connecting edge 36. In order to avoid the formation of a gap-like intermediate space in this area, a step-like transition to a recessed area of the respective housing shell connecting edge can be formed in at least one of the housing shells 16, 18 in the area of their housing shell connecting edge 26, 28 in order to create sufficient receiving space for the insulating shell connecting edge 36 in the area in which the insulating shell connecting edge 36 is to be positioned between the housing shell connecting edges 26, 28.

Nach dem Aufsetzen der Gehäuseschale 18 ist das Auslassrohr 64 im Bereich der Rohraufnahmeöffnung 70 zwischen den Gehäuseschalen-Verbindungsrändern 26, 28 der Gehäuseschalen 16, 18 gehalten, und die Zwischenwände 42, 44, 46 sind zwischen der Isolierschale 30 und der Gehäuseschale 16 bzw. zwischen der Gehäuseschale 18 und der Gehäuseschale 16 gehalten.After the housing shell 18 has been placed in place, the outlet pipe 64 is held in the region of the pipe receiving opening 70 between the housing shell connecting edges 26, 28 of the housing shells 16, 18, and the intermediate walls 42, 44, 46 are held between the insulating shell 30 and the housing shell 16 or between the housing shell 18 and the housing shell 16.

In einem nachfolgenden Arbeitsgang können die bereichsweise den Isolierschalen-Verbindungsrand 36 zwischen sich aufnehmende Gehäuseschalen-Verbindungsränder 26, 28 durch Materialschluss, vorzugsweise Verschweißen, miteinander verbunden werden. Hierzu wird zum Erhalt eines gasdichten Abschlusses eine in Umfangsrichtung vorzugsweise umlaufende Schweißnaht 76 gebildet. Weiter werden das Einlassrohr 62 und das Auslassrohr 70 in ihren jeweils in den Rohraufnahmeöffnungen 66 bzw. 70 liegenden Bereichen mit den diese umgebenden Verbindungsrändern durch Materialschluss, vorzugsweise Verschweißen, verbunden. Auch hier kann zum Erhalt eines gasdichten Abschlusses eine jeweils entlang der jeweiligen Rohraufnahmeöffnung 66, 70 vollständig umlaufende Schweißnaht gebildet werden. Im Bereich der Rohraufnahmeöffnung 66 wird dort, wo die Rohraufnahmeöffnung 66 vom Isolierschalen-Verbindungsrand 36 umgrenzt ist, gleichzeitig auch eine Verbindung zwischen dem Isolierschalen-Verbindungsrand 36 und dem an dessen Formgebung angepassten Gehäuseschalen-Verbindungsrand 28 der Gehäuseschale 18 erzeugt.In a subsequent operation, the housing shell connecting edges 26, 28, which partially accommodate the insulating shell connecting edge 36 between them, can be connected to one another by material bonding, preferably welding. To this end, a weld seam 76 is formed, preferably running all the way around in the circumferential direction, to obtain a gas-tight seal. Furthermore, the inlet pipe 62 and the outlet pipe 70 are welded to the pipe receiving openings 66 and 70 in their respective areas with the surrounding connection edges by material bonding, preferably welding. Here too, a weld seam can be formed that runs completely around the respective pipe receiving opening 66, 70 to obtain a gas-tight seal. In the area of the pipe receiving opening 66, where the pipe receiving opening 66 is bordered by the insulating shell connection edge 36, a connection is simultaneously created between the insulating shell connection edge 36 and the housing shell connection edge 28 of the housing shell 18, which is adapted to its shape.

Bei dem vorangehend beschriebenen Aufbau eines Schalldämpfers wird durch das Anordnen der Isolierschale in dem von den Gehäuseschalen umgrenzten Schalldämpferinnenraum eine bereichsweise thermische Isolierung von einer der Gehäuseschalen erreicht, wobei hierzu lediglich das Einsetzen eines Blechumformteils erforderlich ist. Der zwischen der Isolierschale und der von dieser bereichsweise überdeckten Gehäuseschale gebildete spaltartige Zwischenraum sorgt für eine thermische Isolierung nach außen hin, ohne dass zusätzliche bauliche Maßnahmen erforderlich sind.In the previously described design of a silencer, by arranging the insulating shell in the silencer interior space delimited by the housing shells, a partial thermal insulation of one of the housing shells is achieved, whereby only the insertion of a formed sheet metal part is required. The gap-like space formed between the insulating shell and the housing shell partially covered by it ensures thermal insulation to the outside without the need for additional structural measures.

Es ist abschließend darauf hinzuweisen, dass selbstverständlich der vorangehend beschriebene Schalldämpfer in verschiedenen Aspekten anders ausgeführt sein kann, ohne von den Prinzipien der vorliegenden Erfindung abzuweichen. So könnte beispielsweise die Isolierschale eine der Gehäuseschalen an ihrer gesamten Innenseite überdecken. Die Isolierschale könnte mehrteilig ausgebildet sein, und es könnte in Zuordnung zu beiden Gehäuseschalen jeweils eine Isolierschale vorgesehen sein, so dass zwischen den einander gegenüberliegend zu positionierenden Gehäuseschalen-Verbindungsrändern dann zwei ggf. aneinander anliegende Isolierschalen-Verbindungsränder positioniert sind. Zwischen der Isolierschale und der von dieser an ihrer Innenseite überdeckten Gehäuseschale könnte Isoliermaterial, beispielsweise eine Isoliermatte, also Fasermaterial, angeordnet sein, um die thermische Isolierung noch weiter zu verbessern.Finally, it should be pointed out that the silencer described above can of course be designed differently in various aspects without deviating from the principles of the present invention. For example, the insulating shell could cover one of the housing shells on its entire inside. The insulating shell could be designed in several parts, and an insulating shell could be provided in association with each of the two housing shells, so that two insulating shell connecting edges, possibly abutting one another, are then positioned between the housing shell connecting edges that are to be positioned opposite one another. Insulating material, for example an insulating mat, i.e. fiber material, could be arranged between the insulating shell and the housing shell covered by it on its inside in order to improve the thermal insulation even further.

Weiter ist darauf hinzuweisen, dass beispielsweise beide Rohre, also das Einlassrohr und das Auslassrohr, in einem Bereich mit den Gehäuseschalen verbunden sein könnten, in welchen zumindest eine der Gehäuseschalen von einer Isolierschale überdeckt ist. Alternativ könnten beide Rohre in einem Bereich mit dem Schalldämpfergehäuse verbunden sein, in welchem keine der Gehäuseschalen von einer Isolierschale überdeckt ist.It should also be noted that, for example, both pipes, i.e. the inlet pipe and the outlet pipe, must be connected to the housing shells in one area in which at least one of the housing shells is covered by an insulating shell. Alternatively, both pipes could be connected to the silencer housing in an area in which none of the housing shells is covered by an insulating shell.

Der in dem Schalldämpferinnenraum anzuordnende Schalldämpfereinsatz kann anders ausgeführt sein, als im dargestellten Ausgestaltungsbeispiel gezeigt. Er könnte mehr oder weniger Zwischenwände umfassen. Ferner könnte der Schalldämpfereinsatz so aufgebaut sein, dass im Schalldämpferinnenraum ein Helmholtz-Resonator gebildet wird, und es könnten mehrere Einlassrohre oder/und mehrere Auslassrohre vorgesehen sein, um Abgas in den Schalldämpfer einzuleiten bzw. aus dem Schalldämpfer auszuleiten.The silencer insert to be arranged in the silencer interior can be designed differently than shown in the embodiment example shown. It could comprise more or fewer partition walls. Furthermore, the silencer insert could be constructed in such a way that a Helmholtz resonator is formed in the silencer interior, and several inlet pipes and/or several outlet pipes could be provided in order to introduce exhaust gas into the silencer or to discharge it from the silencer.

Claims (9)

  1. Noise damper for an exhaust gas system of an internal combustion engine, comprising a noise damper housing (14) having at least two interconnected housing shells (16, 18) delimiting a noise damper interior (20), wherein at least one exhaust gas inlet pipe (62) open towards the noise damper interior (20) and at least one exhaust gas outlet pipe (64) open towards the noise damper interior (20) are provided, wherein each housing shell (16, 18) has a housing shell connecting edge (26, 28) extending in a direction away from the noise damper interior (20), and the housing shells (16, 18) are connected to one another by material bonding in the region of their mutually oppositely arranged housing shell connecting edges (26, 28), and wherein an insulating arrangement (32) covering an inner side (48) of at least one of the housing shells (16, 18), at least in certain regions, is provided in the noise damper interior (20), wherein the insulating arrangement (32) has at least one insulating shell (30) with an insulating shell connecting edge (36) extending in a direction away from the noise damper interior (20), and wherein the at least one insulating shell (30) is arranged with its insulating shell connecting edge (36) between the mutually oppositely arranged housing shell connecting edges (26, 28) of the housing shells (16, 18) and is connected by material bonding to the housing shell connecting edges (26, 38) of the housing shells (16, 18) in the region of the insulating shell connecting edge (36),
    wherein an exhaust gas flow volume is formed between the insulating shell (30) and another housing shell (16) of the housing shells (16, 18), wherein the exhaust gas flow volume is subdivided into a plurality of chambers (50, 52, 54, 56) by at least one intermediate wall (42, 44, 46), and in that at least one intermediate wall (44, 46) is held clamped in between the insulating shell (30) and the other housing shell (16) of the housing shells (16, 18),
    characterized in that at least one pipe out of the exhaust gas inlet pipe (62) and the exhaust gas outlet pipe (64) is connected to the noise damper housing (14) in the region of a pipe-receiving opening (66) formed between the insulating shell connecting edge (36) and the housing shell connecting edge (26) of the other housing shell (16) of the housing shells (16, 18).
  2. Noise damper according to claim 1, characterized in that the material bonding connecting the insulating shell connecting edge (36) to the housing shell connecting edges (26, 28) of the housing shells (16, 18) comprises a weld seam (76) which runs, preferably substantially without interruption, along the housing shell connecting edges (26, 28) and the insulating shell connecting edge (36).
  3. Noise damper according to claim 1 or 2, characterized in that at least the at least one housing shell (16) of the housing shells (16, 18), preferably each housing shell (16, 18), comprises a curved housing shell body (22, 24) which is surrounded by the housing shell connecting edge (26, 28) thereof and which delimits the noise damper interior (20), and in that the at least one insulating shell (30) comprises a curved insulating shell body (34) surrounded by the insulating shell connecting edge (36) thereof.
  4. Noise damper according to one of claims 1-3, characterized in that the insulating shell body (34) and the housing shell body (24) of the at least one housing shell (16) of the housing shells (16, 18) are arranged at a distance from one another.
  5. Noise damper according to one of claims 1-4, characterized in that the housing shells (16, 18) and the insulating shell (30) are provided by means of shaped sheet-metal pa rts.
  6. Noise damper according to one of claims 1-5, characterized in that the at least one insulating shell (30) extends from a longitudinal end region (40) of the noise damper housing (14) up to an intermediate wall (42) and covers the at least one housing shell (16) of the housing shells (16, 18) on the inner side (48) thereof in a region extending between the one longitudinal end region (40) of the noise damper housing (14) and the intermediate wall (42), and in that, in a region extending between the intermediate wall (42) and the other longitudinal end region (58) of the noise damper housing (14), the at least one housing shell (16) of the housing shells (16, 18) is not covered on the inner side (48) thereof by the at least one insulating shell (30).
  7. Noise damper according to claim 6, characterized in that a chamber (50) which is at least partially filled with noise-damping material (72) is formed between the intermediate wall (42) and the other longitudinal end region (58) of the noise damper housing (14).
  8. Noise damper according to one of claims 1-7, characterized in that at least one pipe of the exhaust gas inlet pipe (62) and exhaust gas outlet pipe (64) is connected, preferably by material bonding, to the noise damper housing (14) in the region of a pipe-receiving opening (66) formed between the insulating shell connecting edge (36) and the housing shell connecting edge (26) of the other housing shell (16) of the housing shells (16, 18).
  9. Exhaust gas system for an internal combustion engine, in particular in a motor vehicle, comprising at least one noise damper (10) according to one of the preceding claims.
EP22181135.9A 2021-07-26 2022-06-27 Silencer Active EP4124731B1 (en)

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Publication number Priority date Publication date Assignee Title
FR1244433A (en) * 1959-09-17 1960-10-28 Exhaust silencer
US4598790A (en) 1983-01-20 1986-07-08 Honda Giken Kogyo Kabushiki Kaisha Heat and sound insulation device
JPH06221147A (en) 1993-01-25 1994-08-09 Suzuki Motor Corp Exhaust gas muffler device
DE19611133A1 (en) * 1996-03-21 1997-09-25 Eberspaecher J Muffler arrangement
MY121635A (en) * 1996-07-11 2006-02-28 Honda Motor Co Ltd Exhaust muffler
JP3145314B2 (en) 1996-07-11 2001-03-12 本田技研工業株式会社 Exhaust silencer
US5859394A (en) 1997-06-12 1999-01-12 Ap Parts Manufacturing Company Muffler with stamped internal plates defining tubes and separating chambers
DE60135772D1 (en) * 2000-11-07 2008-10-23 Owens Corning Fiberglass Corp BUMPERS / MUFFLER ASSEMBLY
US6789644B2 (en) * 2001-11-06 2004-09-14 Hiraoka Manufacturing Co., Ltd. Engine muffler
US7273129B2 (en) * 2003-09-05 2007-09-25 Faurecia Exhaust Systems, Inc. Muffler with internal heat shield
DE202006013382U1 (en) * 2006-08-31 2008-01-03 Dolmar Gmbh Multi-shell silencer / Hinderschalenkanal
DE102009049462A1 (en) * 2009-10-15 2011-05-05 J. Eberspächer GmbH & Co. KG Exhaust system and Y-distributor

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