EP4105456B1 - Silencer for an exhaust gas system of a combustion engine - Google Patents

Silencer for an exhaust gas system of a combustion engine Download PDF

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Publication number
EP4105456B1
EP4105456B1 EP22172212.7A EP22172212A EP4105456B1 EP 4105456 B1 EP4105456 B1 EP 4105456B1 EP 22172212 A EP22172212 A EP 22172212A EP 4105456 B1 EP4105456 B1 EP 4105456B1
Authority
EP
European Patent Office
Prior art keywords
housing
silencer
opening
region
outlet pipe
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
EP22172212.7A
Other languages
German (de)
French (fr)
Other versions
EP4105456A1 (en
Inventor
Thomas Müller
Philipp Kratz
Benjamin Röhr
Thomas Uhlemann
Nicolas Mettenleiter
Frank Berkemer
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 EP4105456A1 publication Critical patent/EP4105456A1/en
Application granted granted Critical
Publication of EP4105456B1 publication Critical patent/EP4105456B1/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
    • 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
    • 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
    • F01N1/02—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
    • 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
    • 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
    • F01N13/1844—Mechanical joints
    • 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
    • F01N13/1872—Construction facilitating manufacture, assembly, or disassembly the assembly using stamp-formed parts or otherwise deformed sheet-metal
    • F01N13/1877—Construction facilitating manufacture, assembly, or disassembly the assembly using stamp-formed parts or otherwise deformed sheet-metal the channels or tubes thereof being made integrally with the housing
    • 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
    • F01N13/1894—Construction facilitating manufacture, assembly, or disassembly the housing of the assembly consisting of two or more parts, e.g. two half-shells the parts being assembled in longitudinal direction
    • 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
    • F01N2490/10—Two or more expansion chambers in parallel
    • 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
    • F01N2490/14—Dead or resonance chambers connected to gas flow tube by relatively short side-tubes
    • 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 according to the preamble of claim 1.
  • a silencer according to the preamble of claim 1 is from the US 2013/0153329 A1 known.
  • a silencer housing of this known silencer is constructed with two housing shells. In one of the two housing shells, an outlet opening for receiving an outlet pipe is formed in a central region in the direction of a housing longitudinal axis.
  • the DE 10 2011 102 611 A1 discloses a silencer with a silencer housing constructed with two housing shells. An outlet pipe of the silencer passes through a housing opening formed in half in each of the two housing shells. An inlet pipe of the silencer passes through a housing opening formed in one of the housing shells.
  • the DE 10 2011 077 183 A1 discloses a silencer with a wound silencer housing, in which a circumferential wall is formed by a circumferential wall part wrapped circumferentially around intermediate walls and end walls. In the peripheral wall part, housing openings are formed in different peripheral areas to accommodate an inlet pipe or an outlet pipe.
  • the DE 10 2012 206 871 A1 discloses a silencer with a silencer housing constructed with two housing shells.
  • a housing opening for receiving an outlet pipe is formed in half in each of the two housing shells.
  • a housing opening is formed, through which an exhaust pipe socket fixed on the inside of this housing shell extends.
  • a silencer for an exhaust system of an internal combustion engine comprises a silencer housing surrounding a silencer interior with at least two housing parts that are adjacent to one another and connected to one another in an adjacent area and at least one that penetrates the silencer housing in the area of a housing opening formed in the silencer housing Outlet pipe, wherein at least one housing opening through which an outlet pipe passes is formed completely in one of the housing parts.
  • the connection of such an outlet pipe to the silencer housing can be used as Two-part connection can be realized, in the area of which only this outlet pipe and the housing part of the silencer housing are connected to one another to provide a gas-tight seal, which completely provides the housing opening through which the outlet pipe passes.
  • This process is much easier, can be carried out with greater reliability and less waste than a connection process in which three or four parts of a silencer or an exhaust system have to be connected to one another.
  • the design of a silencer according to the invention enables the positioning of an outlet pipe with a greater degree of freedom, which also enables the structural design inside the silencer, in particular with a view to a lighter and therefore more cost-effective, space-saving structure and to reducing pollutant emissions with a greater degree of freedom.
  • the silencer housing comprises two housing shells, each providing a housing part and connected to one another in the adjacent area by material connection and/or positive connection. At least one housing opening formed completely in one of the housing parts is formed in one of the housing shells.
  • a particularly compact design in a longitudinal direction of a silencer is achieved in that the silencer housing has a circumferential wall which is elongated in the direction of a longitudinal axis of the housing and an end wall at both axial end regions of the circumferential wall and at least one housing opening which is completely formed in one of the housing parts is formed in the circumferential wall. Since the silencer housing is constructed with two housing shells, each of the housing shells can provide a section of the two end walls and a section of the peripheral wall.
  • the silencer housing is flattened orthogonally to the longitudinal axis of the housing and at least one complete housing opening formed in one of the housing parts is formed in an area of the peripheral wall that provides a broad side of the silencer housing.
  • this broad side can be oriented downwards, so that when such a silencer forms a rear silencer, exhaust gas released from an outlet pipe is ejected in a downward direction.
  • At least one housing opening formed completely in one of the housing shells is formed in a substantially non-curved region of the peripheral wall.
  • a compact design is supported by the fact that at least one outlet pipe passing through the silencer housing in the area of a housing opening completely formed in one of the housing shells has a longitudinal center axis This outlet pipe is angled in the area of its length region passing through the housing opening with respect to an opening center axis. Furthermore, it can be provided that at least one
  • Silencer housing in the area of a housing opening completely formed in one of the housing parts does not protrude beyond the silencer housing in the direction of the longitudinal axis of the housing.
  • an edge region surrounding this housing opening is reshaped in the direction away from the silencer interior.
  • the outlet pipe then does not rest on an edge of the silencer housing formed, for example, by stamping, but rather on a surface area formed by forming.
  • an outlet pipe passing through at least one housing opening completely formed in one of the housing parts can extend from the interior of the silencer beyond the edge region surrounding this housing opening.
  • an outlet pipe passing through at least one housing opening completely formed in one of the housing parts ends essentially flush with the edge region surrounding this housing opening.
  • At least one connection is formed completely in one of the housing shells
  • the outlet pipe passing through the housing opening is connected by welding to the silencer housing in the area of the edge area surrounding this housing opening.
  • an outlet pipe passing through at least one housing opening completely formed in one of the housing shells can be formed in one piece with its length region extending in the area of the housing opening and outside the silencer interior and can provide an exhaust gas outlet opening for releasing exhaust gas to the environment.
  • An end pipe that is usually present and provides an additional component, which is to be connected to the exhaust pipe leading out of the silencer interior and passing through the silencer housing, is therefore not required in the structure according to the invention.
  • This also has a particularly advantageous effect on the weight and volume of a silencer or an exhaust system constructed with it and makes it possible to use the available installation space efficiently, especially for the silencer with regard to the sound attenuation characteristics and pollutant emissions.
  • the invention further relates to an exhaust system for an internal combustion engine, comprising a silencer constructed according to the invention.
  • the silencer is a rear silencer, and an exhaust gas outlet opening on an outlet pipe passing through at least one housing opening completely formed in one of the housing parts is provided for releasing exhaust gas to the environment.
  • the in Fig. 1 Silencer 10 shown can provide a rear silencer of an exhaust system, generally designated 12, of an internal combustion engine on a vehicle.
  • the silencer 10 comprises a silencer housing, generally designated 14, which in the illustrated embodiment is constructed with two housing shells 20, 22 each providing a housing part 16 or 18.
  • the silencer 10 is constructed in such a way that, even when installed in a vehicle, the housing shell 20 is an upper housing shell, i.e. oriented upwards in the height direction, and the housing shell 22 is a lower housing shell, i.e. oriented downwards in the height direction or facing the ground Housing shell is.
  • Each of the two housing shells 20, 22 is preferably provided as a formed sheet metal part and has a connecting edge 26, 28 that is bent outwards with respect to a silencer interior 24.
  • the two connecting edges 26, 28 provide an adjoining area 29 of the housing shells 20, 22, in which they rest against one another and are connected to one another, for example by welding.
  • the two housing shells 20, 22 could be connected to one another in these edge regions 26, 28 by a positive connection formed by flanging.
  • the two housing shells 20, 22 provide a peripheral wall 30 surrounding a housing longitudinal axis L on the silencer housing 14, each of the two housing shells 20, 22 providing approximately half of the peripheral wall 30.
  • the two housing shells 20, 22 together each provide an end wall 32, 34, with each of the two housing shells 20, 22 also providing approximately half of a respective end wall.
  • a housing opening 36 is formed, which is penetrated by an inlet pipe 38.
  • the housing opening 36 is positioned in such a way that it lies essentially half in the two housing shells 20, 22 and thus interrupts the connecting edges 26, 28 forming the adjacent area 29.
  • an edge region 39, 40 is formed on each of the housing shells 20, 22, which is shaped away from the silencer interior 24 and provides an approximately cylindrical structure of the housing opening 36, with which the inlet pipe 38 is firmly and gas-tightly connected, for example by welding. How this can happen Fig.
  • inlet pipe 38 protrudes slightly outwards beyond the silencer housing 14 in the area of the edge regions 39, 40 or can end flush with the two edge regions 39, 40.
  • An exhaust gas from the area of an internal combustion engine leading to the silencer 10 of the exhaust system 12 can be inserted into the inlet pipe 38 and connected firmly and gas-tight to the inlet pipe 38 and possibly also the two housing shells 20, 22 of the silencer housing 14 by welding.
  • the inlet pipe 38 passes through an intermediate wall 42 arranged in the silencer interior 24 and held between the two housing shells 20, 22 and extends into a chamber 44 formed in the silencer interior 24.
  • an outlet pipe 46 adjoins the inlet pipe 38 and is fixed to the inlet pipe 38, for example by welding and/or by a press connection connected gas-tight.
  • the outlet pipe 46 passes through a housing opening 48, described in more detail below, in the lower housing shell 22 and, with its length region 50 passing through the housing opening 48, extends slightly beyond the housing opening 48 out of the silencer housing 14.
  • the inlet pipe 38 is open via a plurality of openings 54 to the silencer interior 24, in particular to the chamber 52. Furthermore, in the length region of the inlet tube 38 extending in the chamber 52, a resonator tube 56 branches off from it, which passes through an associated opening in the intermediate wall 42 and thus provides a Helmholtz resonator together with the chamber 44.
  • the course of the inlet pipe 38 and the outlet pipe 36 in the silencer interior 24 is only shown as an example. More than the two chambers 44, 52 shown could be provided in the silencer interior 24, which could communicate with one another via one or more pipes extending exclusively in the silencer interior 24.
  • at least one inlet pipe 38 is provided, via which exhaust gas is introduced into the silencer interior 24, and at least one outlet pipe 46 is provided, via which exhaust gas leaves the silencer housing 14.
  • the inlet pipe 38 and the outlet pipe 46 do not necessarily have to connect directly to one another, but could, for example, also be open to one or different chambers and in this way be connected to one another in a connection that guides the exhaust gas through the silencer housing 14.
  • the housing opening 48 provided in association with the outlet pipe 46 is formed in the area of the peripheral wall 30 of the silencer housing 14.
  • the silencer housing 14 is flattened transversely to its longitudinal axis L and thus essentially represents two Fig. 2 Broadsides 58, 60 shown above and below as well as two in Fig. 2 Narrow sides 62, 64 shown on the right and left are ready.
  • the housing opening 48 through which the outlet pipe 46 extends, is provided in the broad side 60 of the lower housing shell 20.
  • the lower housing shell 22 is essentially non-curved, i.e. has an area 66 lying essentially in a plane E, in which the housing opening 48 penetrated by the outlet pipe 46 is formed.
  • the non-curved region 66 of the lower housing shell 22, which lies essentially in the plane E the lower housing shell 22 is deformed in a region surrounding the housing opening 48 in the direction of the silencer interior 24 in order to provide an edge region 68 which preferably essentially completely surrounds the housing opening 48 .
  • the outlet pipe 46 rests on the inside of this edge region 68, so that sharp-edged contact is avoided.
  • the outlet pipe 46 can be firmly and gas-tightly connected to the lower housing shell 22 by means of a weld seam guided, for example, along an outwardly oriented end face of the edge region 68.
  • the housing opening 48 is formed in the essentially non-curved region 66 of the section of the peripheral wall 30 provided on the lower housing shell 22 and lying in the plane E, this can be compared, for example, with a circular cross-sectional contour of the outlet pipe 46 in its length region 50 passing through the housing opening 48 simple geometric configuration, in particular with an elliptical circumferential contour, since the outlet pipe 46 is oriented in such a way that its length region 50, which extends through the housing opening 48, is oriented at an angle with its longitudinal center axis A present in this length region 50 with respect to an opening center axis M of the housing opening 48.
  • the opening center axis M is essentially orthogonal to the plane E in which the region 66 of the lower housing shell 22 having the housing opening 48 lies.
  • the outlet pipe 46 which can be constructed in one piece or from several pipe segments, extends through the housing opening 48 and over the edge region 68 out.
  • This length region 50 of the outlet pipe 46 is formed in one piece and provides an exhaust gas outlet opening 70 of the outlet pipe 46 or the silencer 10.
  • the outlet pipe 46, with its length region 50 extending through the housing opening 48 and outside the same, is designed in such a way that it essentially does not protrude beyond the overall outer circumferential contour of the silencer housing 14, particularly downwards. Even in the direction of the longitudinal axis L of the housing, the outlet pipe 48 does not protrude beyond the outer circumferential contour of the silencer housing 14, which in Fig.
  • outlet pipe 46 Since the outlet pipe 46, with its length region 50 which passes through the housing opening 48 and also provides the exhaust gas outlet opening 70, only protrudes outwards for a comparatively short time beyond the silencer housing 14, there is no risk of a tailpipe trembling occurring due to vibrations present in a vehicle.
  • the silencer shown in the figures could be designed differently in various areas.
  • two or more outlet pipes could be guided out of the silencer housing 14 in the manner shown in the figures in connection with the outlet pipe 46.
  • the housing opening 36 provided in association with the inlet pipe 38 could also be be provided completely in one of the two housing shells 20, 22, preferably in the area of the peripheral wall 30.

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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 gemäß dem Oberbegriff des Anspruchs 1.The present invention relates to a silencer for an exhaust system of an internal combustion engine according to the preamble of claim 1.

Ein Schalldämpfer gemäß dem Oberbegriff des Anspruchs 1 ist aus der US 2013/0153329 A1 bekannt. Ein Schalldämpfergehäuse dieses bekannten Schalldämpfers ist mit zwei Gehäuseschalen aufgebaut. In einer der beiden Gehäuseschalen ist in einem in Richtung einer Gehäuselängsachse zentralen Bereich eine Auslassöffnung zur Aufnahme eines Auslassrohrs gebildet.A silencer according to the preamble of claim 1 is from the US 2013/0153329 A1 known. A silencer housing of this known silencer is constructed with two housing shells. In one of the two housing shells, an outlet opening for receiving an outlet pipe is formed in a central region in the direction of a housing longitudinal axis.

Die DE 10 2011 102 611 A1 offenbart einen Schalldämpfer mit einem mit zwei Gehäuseschalen aufgebauten Schalldämpfergehäuse. Ein Auslassrohr des Schalldämpfers durchsetzt eine in jeder der beiden Gehäuseschalen hälftig ausgebildete Gehäuseöffnung. Ein Einlassrohr des Schalldämpfers durchsetzt eine in einer der Gehäuseschalen ausgebildete Gehäuseöffnung.The DE 10 2011 102 611 A1 discloses a silencer with a silencer housing constructed with two housing shells. An outlet pipe of the silencer passes through a housing opening formed in half in each of the two housing shells. An inlet pipe of the silencer passes through a housing opening formed in one of the housing shells.

Die DE 10 2011 077 183 A1 offenbart einen Schalldämpfer mit einem Wickel-Schalldämpfergehäuse, bei welchem eine Umfangswandung durch ein in Umfangsrichtung um Zwischenwände und Stirnwände gewickeltes Umfangswandungsteil gebildet ist. In dem Umfangswandungsteil sind in verschiedenen Umfangsbereichen Gehäuseöffnungen zur Aufnahme eines Einlassrohrs bzw. eines Auslassrohrs ausgebildet.The DE 10 2011 077 183 A1 discloses a silencer with a wound silencer housing, in which a circumferential wall is formed by a circumferential wall part wrapped circumferentially around intermediate walls and end walls. In the peripheral wall part, housing openings are formed in different peripheral areas to accommodate an inlet pipe or an outlet pipe.

Die DE 10 2012 206 871 A1 offenbart einen Schalldämpfer mit einem mit zwei Gehäuseschalen aufgebauten Schalldämpfergehäuse. Eine Gehäuseöffnung zur Aufnahme eines Auslassrohrs ist hälftig in jeder der beiden Gehäuseschalen ausgebildet. In einem Eckbereich von einer der Gehäuseschalen ist eine Gehäuseöffnung gebildet, durch welche ein an einer Innenseite dieser Gehäuseschale festgelegter Abgasrohrstutzen sich hindurch erstreckt.The DE 10 2012 206 871 A1 discloses a silencer with a silencer housing constructed with two housing shells. A housing opening for receiving an outlet pipe is formed in half in each of the two housing shells. In a corner region of one of the housing shells, a housing opening is formed, through which an exhaust pipe socket fixed on the inside of this housing shell extends.

Es ist die Aufgabe der vorliegenden Erfindung, einen einfach und kostengünstig mit geringem Ausschuss in der Produktion herstellbaren, im Betrieb gleichwohl zuverlässigen Schalldämpfer bereitzustellen.It is the object of the present invention to provide a silencer that can be produced easily and cost-effectively with little waste in production and is nevertheless reliable in operation.

Erfindungsgemäß wird diese Aufgabe gelöst durch einen Schalldämpfer für eine Abgasanlage einer Brennkraftmaschine gemäß Anspruch 1. Dieser Schalldämpfer umfasst ein einen Schalldämpferinnenraum umgebendes Schalldämpfergehäuse mit wenigstens zwei in einem Angrenzungsbereich aneinander angrenzenden und miteinander verbundenen Gehäuseteilen und wenigstens ein das Schalldämpfergehäuse im Bereich einer im Schalldämpfergehäuse gebildeten Gehäuseöffnung durchsetzendes Auslassrohr, wobei wenigstens eine von einem Auslassrohr durchsetzte Gehäuseöffnung vollständig in einem der Gehäuseteile ausgebildet 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 surrounding a silencer interior with at least two housing parts that are adjacent to one another and connected to one another in an adjacent area and at least one that penetrates the silencer housing in the area of a housing opening formed in the silencer housing Outlet pipe, wherein at least one housing opening through which an outlet pipe passes is formed completely in one of the housing parts.

Da bei dem erfindungsgemäß aufgebauten Schalldämpfer zumindest im Zusammenhang mit einem, vorzugsweise im Zusammenhang mit jedem Auslassrohr vorgesehen ist, dass dieses das Schalldämpfergehäuse in einem Bereich durchsetzt, in welchem nicht zwei Gehäuseteile des Schalldämpfers aneinander angrenzen, kann die Verbindung eines derartigen Auslassrohrs mit dem Schalldämpfergehäuse als zwei-Teile-Verbindung realisiert werden, in deren Bereich nur dieses Auslassrohr und das Gehäuseteil des Schalldämpfergehäuses miteinander zum Bereitstellen eines gasdichten Abschlusses verbunden werden, welches die von dem Auslassrohr durchsetzte Gehäuseöffnung vollständig bereitstellt. Dieser Vorgang ist wesentlich leichter, mit größerer Zuverlässigkeit und geringerem Ausschuss durchführbar, als ein Verbindungsvorgang, in welchem drei oder vier Teile eines Schalldämpfers bzw. einer Abgasanlage miteinander zu verbinden sind. Gleichzeitig ermöglicht die erfindungsgemäße Ausgestaltung eines Schalldämpfers das Positionieren eines Auslassrohrs mit einem größeren Freiheitsgrad, was auch die bauliche Ausgestaltung im Inneren des Schalldämpfers insbesondere mit Hinblick auf einen leichteren und somit auch kostengünstigeren, raumsparenden Aufbau und auf die Verringerung des Schadstoffausstoßes mit größerem Freiheitsgrad ermöglicht.Since in the silencer constructed according to the invention it is provided at least in connection with one, preferably in connection with each, outlet pipe that this passes through the silencer housing in an area in which two housing parts of the silencer do not adjoin one another, the connection of such an outlet pipe to the silencer housing can be used as Two-part connection can be realized, in the area of which only this outlet pipe and the housing part of the silencer housing are connected to one another to provide a gas-tight seal, which completely provides the housing opening through which the outlet pipe passes. This process is much easier, can be carried out with greater reliability and less waste than a connection process in which three or four parts of a silencer or an exhaust system have to be connected to one another. At the same time, the design of a silencer according to the invention enables the positioning of an outlet pipe with a greater degree of freedom, which also enables the structural design inside the silencer, in particular with a view to a lighter and therefore more cost-effective, space-saving structure and to reducing pollutant emissions with a greater degree of freedom.

Das Schalldämpfergehäuse umfasst zwei jeweils ein Gehäuseteil bereitstellende, in dem Angrenzungsbereich miteinander durch Materialschluss oder/und Formschluss verbundene Gehäuseschalen. Wenigstens eine vollständig in einem der Gehäuseteile ausgebildete Gehäuseöffnung ist in einer der Gehäuseschalen ausgebildet.The silencer housing comprises two housing shells, each providing a housing part and connected to one another in the adjacent area by material connection and/or positive connection. At least one housing opening formed completely in one of the housing parts is formed in one of the housing shells.

Eine insbesondere in einer Längsrichtung eines Schalldämpfers kompakte Bauweise wird dadurch erreicht, dass das Schalldämpfergehäuse eine in Richtung einer Gehäuselängsachse langgestreckte Umfangswandung und an beiden axialen Endbereichen der Umfangswandung eine Stirnwandung aufweist und wenigstens eine vollständig in einem der Gehäuseteile ausgebildete Gehäuseöffnung in der Umfangswandung ausgebildet ist. Da das Schalldämpfergehäuse mit zwei Gehäuseschalen aufgebaut ist, kann dabei jede der Gehäuseschalen jeweils einen Abschnitt der beiden Stirnwandungen und einen Abschnitt der Umfangswandung bereitstellen.A particularly compact design in a longitudinal direction of a silencer is achieved in that the silencer housing has a circumferential wall which is elongated in the direction of a longitudinal axis of the housing and an end wall at both axial end regions of the circumferential wall and at least one housing opening which is completely formed in one of the housing parts is formed in the circumferential wall. Since the silencer housing is constructed with two housing shells, each of the housing shells can provide a section of the two end walls and a section of the peripheral wall.

Zur Unterbringung unter dem Unterboden eines Fahrzeugs kann es vorteilhaft sein, wenn das Schalldämpfergehäuse orthogonal zur Gehäuselängsachse abgeflacht ist und wenigstens eine vollständige in einem der Gehäuseteile ausgebildete Gehäuseöffnung in einem eine Breitseite des Schalldämpfergehäuses bereitstellenden Bereich der Umfangswandung ausgebildet ist. Bei Einbau in ein Fahrzeug kann diese Breitseite nach unten orientiert sein, so dass dann, wenn ein derartiger Schalldämpfer eine Endschalldämpfer bildet, aus einem Auslassrohr abgegebenes Abgas in Richtung nach unten ausgestoßen wird.For accommodation under the underbody of a vehicle, it can be advantageous if the silencer housing is flattened orthogonally to the longitudinal axis of the housing and at least one complete housing opening formed in one of the housing parts is formed in an area of the peripheral wall that provides a broad side of the silencer housing. When installed in a vehicle, this broad side can be oriented downwards, so that when such a silencer forms a rear silencer, exhaust gas released from an outlet pipe is ejected in a downward direction.

Für einen leicht zu realisierenden Zusammenbau ist wenigstens eine vollständig in einer der Gehäuseschalen ausgebildete Gehäuseöffnung in einem im Wesentlichen ungekrümmten Bereich der Umfangswandung ausgebildet.For an easy-to-implement assembly, at least one housing opening formed completely in one of the housing shells is formed in a substantially non-curved region of the peripheral wall.

Eine kompakte Bauart wird dadurch unterstützt, dass bei wenigstens einem das Schalldämpfergehäuse im Bereich einer vollständig in einer der Gehäuseschalen ausgebildeten Gehäuseöffnung durchsetzenden Auslassrohr eine Längsmittenachse dieses Auslassrohrs im Bereich seines die Gehäuseöffnung durchsetzenden Längenbereichs bezüglich einer Öffnungsmittenachse angewinkelt ist. Ferner kann hierfür vorgesehen sein, dass wenigstens ein dasA compact design is supported by the fact that at least one outlet pipe passing through the silencer housing in the area of a housing opening completely formed in one of the housing shells has a longitudinal center axis This outlet pipe is angled in the area of its length region passing through the housing opening with respect to an opening center axis. Furthermore, it can be provided that at least one

Schalldämpfergehäuse im Bereich einer vollständig in einem der Gehäuseteile ausgebildeten Gehäuseöffnung durchsetzendes Auslassrohr in Richtung der Gehäuselängsachse nicht über das Schalldämpfergehäuse hervorsteht. Um eine Anlagewechselwirkung zwischen einem Auslassrohr und dem Schalldämpfergehäuse an einem scharfkantigen Bereich desSilencer housing in the area of a housing opening completely formed in one of the housing parts does not protrude beyond the silencer housing in the direction of the longitudinal axis of the housing. To avoid contact interaction between an outlet pipe and the silencer housing on a sharp-edged area of the

Schalldämpfergehäuses zu vermeiden, ist im Bereich wenigstens einer vollständig in einer der Gehäuseschalen ausgebildeten Gehäuseöffnung ein diese Gehäuseöffnung umgebender Randbereich in Richtung von dem Schalldämpferinnenraum weg umgeformt. Das Auslassrohr liegt dann nicht an einer beispielsweise durch Stanzen gebildeten Kante des Schalldämpfergehäuses, sondern an einem durch Umformen gebildeten Flächenbereich an.To avoid the silencer housing, in the area of at least one housing opening completely formed in one of the housing shells, an edge region surrounding this housing opening is reshaped in the direction away from the silencer interior. The outlet pipe then does not rest on an edge of the silencer housing formed, for example, by stamping, but rather on a surface area formed by forming.

Um den den Schalldämpfer verlassenen Abgasstrom in einer definierten Richtung leiten zu können, kann ein wenigstens eine vollständig in einem der Gehäuseteile ausgebildete Gehäuseöffnung durchsetzendes Auslassrohr sich aus dem Schalldämpferinnenraum über den diese Gehäuseöffnung umgebenden Randbereich hinaus erstrecken.In order to be able to direct the exhaust gas flow leaving the silencer in a defined direction, an outlet pipe passing through at least one housing opening completely formed in one of the housing parts can extend from the interior of the silencer beyond the edge region surrounding this housing opening.

Soll eine sehr kompakte über die Außenkontur eines Fahrzeugs möglichst wenig hervorstehende Form des Schalldämpfers erreicht werden, kann vorgesehen sein, dass ein wenigstens eine vollständig in einem der Gehäuseteile ausgebildete Gehäuseöffnung durchsetzendes Auslassrohr im Wesentlichen bündig mit dem diese Gehäuseöffnung umgebenden Randbereich endet.If a very compact shape of the silencer that protrudes as little as possible beyond the outer contour of a vehicle is to be achieved, it can be provided that an outlet pipe passing through at least one housing opening completely formed in one of the housing parts ends essentially flush with the edge region surrounding this housing opening.

Um eine einfach zu realisierende, gasdichte und mechanisch stabile Verbindung zwischen einem Auslassrohr und dem Schalldämpfergehäuse zu erreichen, ist ein wenigstens eine vollständig in einer der Gehäuseschalen ausgebildete Gehäuseöffnung durchsetzendes Auslassrohr mit dem Schalldämpfergehäuse im Bereich des diese Gehäuseöffnung umgebenden Randbereichs durch Verschweißen verbunden.In order to achieve an easy-to-implement, gas-tight and mechanically stable connection between an outlet pipe and the silencer housing, at least one connection is formed completely in one of the housing shells The outlet pipe passing through the housing opening is connected by welding to the silencer housing in the area of the edge area surrounding this housing opening.

Bei einer besonders vorteilhaften Ausgestaltung kann ein wenigstens eine vollständig in einer der Gehäuseschalen ausgebildete Gehäuseöffnung durchsetzendes Auslassrohr mit seinem im Bereich der Gehäuseöffnung und außerhalb des Schalldämpferinnenraums sich erstreckenden Längenbereich einstückig ausgebildet sein und eine Abgasaustrittsöffnung zur Abgabe von Abgas zur Umgebung bereitstellen. Dies bedeutet, dass insbesondere auch in demjenigen Bereich, in welchem das Auslassrohr das Schalldämpfergehäuse durchsetzt, nicht zwei Rohrabschnitte zum Bereitstellen des Auslassrohrs miteinander und gegebenenfalls auch dem Schalldämpfergehäuse verbunden werden müssen. Ein üblicherweise vorhandenes und ein zusätzliches Bauteil bereitstellendes Endrohr, welches an das Abgas aus dem Schalldämpferinnenraum herausführende und das Schalldämpfergehäuse durchsetzende Auslassrohr anzubinden ist, ist bei dem erfindungsgemäßen Aufbau daher nicht erforderlich. Auch dies wirkt sich besonders vorteilhaft auf das Gewicht und das Volumen eines Schalldämpfers bzw. einer damit aufgebauten Abgasanlage aus und ermöglicht es, den zur Verfügung stehenden Bauraum effizient insbesondere auch für den Schalldämpfer mit Hinblick auf die Schalldämpfungscharakteristik und den Schadstoffausstoß zu nutzen.In a particularly advantageous embodiment, an outlet pipe passing through at least one housing opening completely formed in one of the housing shells can be formed in one piece with its length region extending in the area of the housing opening and outside the silencer interior and can provide an exhaust gas outlet opening for releasing exhaust gas to the environment. This means that, especially in the area in which the outlet pipe passes through the silencer housing, two pipe sections do not have to be connected to one another and possibly also to the silencer housing in order to provide the outlet pipe. An end pipe that is usually present and provides an additional component, which is to be connected to the exhaust pipe leading out of the silencer interior and passing through the silencer housing, is therefore not required in the structure according to the invention. This also has a particularly advantageous effect on the weight and volume of a silencer or an exhaust system constructed with it and makes it possible to use the available installation space efficiently, especially for the silencer with regard to the sound attenuation characteristics and pollutant emissions.

Die Erfindung betrifft ferner eine Abgasanlage für eine Brennkraftmaschine, umfassend einen erfindungsgemäß aufgebauten Schalldämpfer.The invention further relates to an exhaust system for an internal combustion engine, comprising a silencer constructed according to the invention.

Bei einer besonders bevorzugten Ausgestaltung ist der Schalldämpfer ein Endschalldämpfer, und eine Abgasaustrittsöffnung an einem wenigstens eine vollständig in einem der Gehäuseteile ausgebildete Gehäuseöffnung durchsetzenden Auslassrohr ist zur Abgabe von Abgas zur Umgebung vorgesehen.In a particularly preferred embodiment, the silencer is a rear silencer, and an exhaust gas outlet opening on an outlet pipe passing through at least one housing opening completely formed in one of the housing parts is provided for releasing exhaust gas to the environment.

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

Fig. 1
eine Seitenansicht eines Schalldämpfers in Blickrichtung I in Fig. 2;
Fig. 2
eine Axialansicht des Schalldämpfers in der Fig. 1 in Blickrichtung II in Fig. 1;
Fig. 3
eine Querschnittansicht des Schalldämpfers der Fig. 1, geschnitten längs einer Linie III-III in Fig. 1;
Fig. 4
eine Draufsicht des Schalldämpfers der Fig. 1 in Blickrichtung IV bei weggelassener oberer Gehäuseschale.
The present invention is described in detail below with reference to the accompanying figures. It shows:
Fig. 1
a side view of a silencer in the viewing direction I in Fig. 2 ;
Fig. 2
an axial view of the silencer in the Fig. 1 in viewing direction II in Fig. 1 ;
Fig. 3
a cross-sectional view of the silencer Fig. 1 , cut along a line III-III in Fig. 1 ;
Fig. 4
a top view of the silencer of the Fig. 1 in viewing direction IV with the upper housing shell omitted.

Der in Fig. 1 dargestellte Schalldämpfer 10 kann einen Endschalldämpfer einer allgemein mit 12 bezeichneten Abgasanlage einer Brennkraftmaschine an einem Fahrzeug bereitstellen. Der Schalldämpfer 10 umfasst ein allgemein mit 14 bezeichnetes Schalldämpfergehäuse, welches im dargestellten Ausgestaltungsbeispiel mit zwei jeweils ein Gehäuseteil 16 bzw. 18 bereitstellenden Gehäuseschalen 20, 22 aufgebaut ist. Der Schalldämpfer 10 ist so aufgebaut, dass er auch bei Einbau in ein Fahrzeug die Gehäuseschale 20 eine obere, also in Höhenrichtung nach oben orientiert liegende Gehäuseschale ist, und die Gehäuseschale 22 eine untere, also in der Höhenrichtung nach unten bzw. dem Boden zugewandt orientierte Gehäuseschale ist.The in Fig. 1 Silencer 10 shown can provide a rear silencer of an exhaust system, generally designated 12, of an internal combustion engine on a vehicle. The silencer 10 comprises a silencer housing, generally designated 14, which in the illustrated embodiment is constructed with two housing shells 20, 22 each providing a housing part 16 or 18. The silencer 10 is constructed in such a way that, even when installed in a vehicle, the housing shell 20 is an upper housing shell, i.e. oriented upwards in the height direction, and the housing shell 22 is a lower housing shell, i.e. oriented downwards in the height direction or facing the ground Housing shell is.

Jede der beiden Gehäuseschalen 20, 22 ist vorzugsweise als Blechumformteil bereitgestellt und weist einen bezüglich eines Schalldämpferinnenraums 24 nach außen abgebogenen Verbindungsrand 26, 28 auf. Die beiden Verbindungsränder 26, 28 stellen einen Angrenzungsbereich 29 der Gehäuseschalen 20, 22 bereit, in welchem diese aneinander anliegen und beispielsweise durch Verschweißen miteinander verbunden sind. Alternativ oder zusätzlich könnten in diesen Randbereichen 26, 28 die beiden Gehäuseschalen 20, 22 durch einen durch Umbördeln gebildeten Formschluss miteinander verbunden sein.Each of the two housing shells 20, 22 is preferably provided as a formed sheet metal part and has a connecting edge 26, 28 that is bent outwards with respect to a silencer interior 24. The two connecting edges 26, 28 provide an adjoining area 29 of the housing shells 20, 22, in which they rest against one another and are connected to one another, for example by welding. Alternatively or additionally, the two housing shells 20, 22 could be connected to one another in these edge regions 26, 28 by a positive connection formed by flanging.

Die beiden Gehäuseschalen 20, 22 stellen an dem Schalldämpfergehäuse 14 eine eine Gehäuselängsachse L umgebende Umfangswand 30 bereit, wobei jede der beiden Gehäuseschalen 20, 22 näherungsweise etwa die Hälfte der Umfangswand 30 bereitstellt. In den beiden axialen Endbereichen des Schalldämpfergehäuses 14 stellen die beiden Gehäuseschalen 20, 22 zusammen jeweils eine Stirnwandung 32, 34 bereit, wobei auch hier jede der beiden Gehäuseschalen 20, 22 näherungsweise etwa die Hälfte einer jeweiligen Stirnwandung bereitstellt.The two housing shells 20, 22 provide a peripheral wall 30 surrounding a housing longitudinal axis L on the silencer housing 14, each of the two housing shells 20, 22 providing approximately half of the peripheral wall 30. In the two axial end regions of the silencer housing 14, the two housing shells 20, 22 together each provide an end wall 32, 34, with each of the two housing shells 20, 22 also providing approximately half of a respective end wall.

An der in Fig. 1 rechts dargestellten Stirnwandung 34 ist eine Gehäuseöffnung 36 gebildet, welche von einem Einlassrohr 38 durchsetzt ist. Die Gehäuseöffnung 36 ist derart positioniert, dass sie im Wesentlichen jeweils hälftig in den beiden Gehäuseschalen 20, 22 liegt und somit die den Angrenzungsbereich 29 bildenden Verbindungsränder 26, 28 unterbricht. Im Bereich der Gehäuseöffnung 36 ist an jeder der Gehäuseschalen 20, 22 ein in Richtung vom Schalldämpferinnenraum 24 weg umgeformter und näherungsweise eine zylindrische Struktur der Gehäuseöffnung 36 bereitstellender Randbereich 39, 40 gebildet, mit welchen das Einlassrohr 38 beispielsweise durch Verschweißen fest und gasdicht verbunden ist. Dabei kann, wie dies die Fig. 1 andeutet, das Einlassrohr 38 im Bereich der Randbereiche 39, 40 geringfügig nach außen über das Schalldämpfergehäuse 14 hervorstehen oder kann mit den beiden Randbereichen 39, 40 bündig enden. In das Einlassrohr 38 kann ein Abgas aus dem Bereich einer Brennkraftmaschine zum Schalldämpfer 10 führendes Abgasrohr der Abgasanlage 12 eingesetzt und mit dem Einlassrohr 38 und ggf. auch den beiden Gehäuseschalen 20, 22 des Schalldämpfergehäuses 14 durch Verschweißen fest und gasdicht verbunden werden.At the in Fig. 1 In the end wall 34 shown on the right, a housing opening 36 is formed, which is penetrated by an inlet pipe 38. The housing opening 36 is positioned in such a way that it lies essentially half in the two housing shells 20, 22 and thus interrupts the connecting edges 26, 28 forming the adjacent area 29. In the area of the housing opening 36, an edge region 39, 40 is formed on each of the housing shells 20, 22, which is shaped away from the silencer interior 24 and provides an approximately cylindrical structure of the housing opening 36, with which the inlet pipe 38 is firmly and gas-tightly connected, for example by welding. How this can happen Fig. 1 indicates that the inlet pipe 38 protrudes slightly outwards beyond the silencer housing 14 in the area of the edge regions 39, 40 or can end flush with the two edge regions 39, 40. An exhaust gas from the area of an internal combustion engine leading to the silencer 10 of the exhaust system 12 can be inserted into the inlet pipe 38 and connected firmly and gas-tight to the inlet pipe 38 and possibly also the two housing shells 20, 22 of the silencer housing 14 by welding.

In dem dargestellten Ausgestaltungsbeispiel durchsetzt das Einlassrohr 38 eine im Schalldämpferinnenraum 24 angeordnete und zwischen den beiden Gehäuseschalen 20, 22 festgehaltene Zwischenwand 42 und erstreckt sich in eine im Schalldämpferinnenraum 24 gebildete Kammer 44. Im Bereich der Kammer 44 schließt an das Einlassrohr 38 ein Auslassrohr 46 an und ist mit dem Einlassrohr 38 beispielsweise durch Verschweißen oder/und durch eine Pressverbindung fest und gasdicht verbunden. Das Auslassrohr 46 durchsetzt eine nachfolgend detaillierter beschriebene Gehäuseöffnung 48 in der unteren Gehäuseschale 22 und erstreckt sich mit seinem die Gehäuseöffnung 48 durchsetzenden Längenbereich 50 geringfügig über die aus Gehäuseöffnung 48 aus dem Schalldämpfergehäuse 14 heraus.In the illustrated embodiment, the inlet pipe 38 passes through an intermediate wall 42 arranged in the silencer interior 24 and held between the two housing shells 20, 22 and extends into a chamber 44 formed in the silencer interior 24. In the area of the chamber 44, an outlet pipe 46 adjoins the inlet pipe 38 and is fixed to the inlet pipe 38, for example by welding and/or by a press connection connected gas-tight. The outlet pipe 46 passes through a housing opening 48, described in more detail below, in the lower housing shell 22 and, with its length region 50 passing through the housing opening 48, extends slightly beyond the housing opening 48 out of the silencer housing 14.

Im Bereich einer von der Kammer 44 durch die Zwischenwand 42 getrennten weiteren Kammer 52 ist das Einlassrohr 38 über eine Mehrzahl von Öffnungen 54 zum Schalldämpferinnenraum 24, insbesondere zur Kammer 52, offen. Ferner zweigt in dem in der Kammer 52 sich erstreckenden Längenbereich des Einlassrohrs 38 von diesem ein Resonatorrohr 56 ab, welches eine zugeordnete Öffnung in der Zwischenwand 42 durchsetzt und somit zusammen mit der Kammer 44 einen Helmholtz-Resonator bereitstellt.In the area of a further chamber 52 separated from the chamber 44 by the intermediate wall 42, the inlet pipe 38 is open via a plurality of openings 54 to the silencer interior 24, in particular to the chamber 52. Furthermore, in the length region of the inlet tube 38 extending in the chamber 52, a resonator tube 56 branches off from it, which passes through an associated opening in the intermediate wall 42 and thus provides a Helmholtz resonator together with the chamber 44.

Es ist darauf hinzuweisen, dass der Verlauf des Einlassrohrs 38 und des Auslassrohrs 36 im Schalldämpferinnenraum 24 nur beispielhaft dargestellt ist. Es könnten im Schalldämpferinnenraum 24 mehr als die beiden dargestellten Kammern 44, 52 vorgesehen sein, die über ein oder mehrere ausschließlich im Schalldämpferinnenraum 24 sich erstreckende Rohre miteinander kommunizieren könnten. Für die Zwecke der vorliegenden Erfindung ist maßgebend, dass zumindest ein Einlassrohr 38 vorgesehen ist, über welches Abgas in den Schalldämpferinnenraum 24 eingeleitet wird, und zumindest ein Auslassrohr 46 vorgesehen ist, über welches Abgas das Schalldämpfergehäuse 14 verlässt. Das Einlassrohr 38 und das Auslassrohr 46 müssen dabei nicht zwingend unmittelbar einander anschließen, sondern könnten beispielsweise auch zu einer oder zu verschiedenen Kammern offen sein und auf diese Art und Weise in einer das Abgas durch das Schalldämpfergehäuse 14 führenden Verbindung miteinander stehen.It should be noted that the course of the inlet pipe 38 and the outlet pipe 36 in the silencer interior 24 is only shown as an example. More than the two chambers 44, 52 shown could be provided in the silencer interior 24, which could communicate with one another via one or more pipes extending exclusively in the silencer interior 24. For the purposes of the present invention, it is important that at least one inlet pipe 38 is provided, via which exhaust gas is introduced into the silencer interior 24, and at least one outlet pipe 46 is provided, via which exhaust gas leaves the silencer housing 14. The inlet pipe 38 and the outlet pipe 46 do not necessarily have to connect directly to one another, but could, for example, also be open to one or different chambers and in this way be connected to one another in a connection that guides the exhaust gas through the silencer housing 14.

Die in Zuordnung zu dem Auslassrohr 46 vorgesehene Gehäuseöffnung 48 ist im Bereich der Umfangswandung 30 des Schalldämpfergehäuses 14 ausgebildet. Das Schalldämpfergehäuse 14 ist quer zu seiner Gehäuselängsachse L abgeflacht und stellt somit im Wesentlichen zwei in Fig. 2 oben bzw. unten dargestellte Breitseiten 58, 60 sowie zwei in Fig. 2 rechts und links dargestellte Schmalseiten 62, 64 bereit.The housing opening 48 provided in association with the outlet pipe 46 is formed in the area of the peripheral wall 30 of the silencer housing 14. The silencer housing 14 is flattened transversely to its longitudinal axis L and thus essentially represents two Fig. 2 Broadsides 58, 60 shown above and below as well as two in Fig. 2 Narrow sides 62, 64 shown on the right and left are ready.

Die Gehäuseöffnung 48, durch welche das Auslassrohr 46 sich hindurch erstreckt, ist in der Breitseite 60 der unteren Gehäuseschale 20 vorgesehen. In demjenigen Bereichen, in welchen die Gehäuseöffnung 48 in der unteren Gehäuseschale 22 gebildet ist, ist die untere Gehäuseschale 22 im Wesentlichen ungekrümmt ausgebildet, weist also einen im Wesentlichen in einer Ebene E liegenden Bereich 66 auf, in welchem die vom Auslassrohr 46 durchsetzte Gehäuseöffnung 48 gebildet ist. In dem ungekrümmten, im Wesentlichen in der Ebene E liegenden Bereich 66 der unteren Gehäuseschale 22 ist die untere Gehäuseschale 22 in einem die Gehäuseöffnung 48 umgebenden Bereich in Richtung vom Schalldämpferinnenraum 24 weg verformt, um einen die Gehäuseöffnung 48 vorzugsweise im Wesentlichen vollständig umgebenden Randbereich 68 bereitzustellen. An der Innenseite dieses Randbereichs 68 liegt das Auslassrohr 46 an, so dass ein scharfkantiger Anlagekontakt vermieden ist. Durch eine beispielsweise entlang einer nach außen orientierten Stirnseite des Randbereichs 68 geführte Schweißnaht kann das Auslassrohr 46 mit der unteren Gehäuseschale 22 fest und gasdicht verbunden werden.The housing opening 48, through which the outlet pipe 46 extends, is provided in the broad side 60 of the lower housing shell 20. In those areas in which the housing opening 48 is formed in the lower housing shell 22, the lower housing shell 22 is essentially non-curved, i.e. has an area 66 lying essentially in a plane E, in which the housing opening 48 penetrated by the outlet pipe 46 is formed. In the non-curved region 66 of the lower housing shell 22, which lies essentially in the plane E, the lower housing shell 22 is deformed in a region surrounding the housing opening 48 in the direction of the silencer interior 24 in order to provide an edge region 68 which preferably essentially completely surrounds the housing opening 48 . The outlet pipe 46 rests on the inside of this edge region 68, so that sharp-edged contact is avoided. The outlet pipe 46 can be firmly and gas-tightly connected to the lower housing shell 22 by means of a weld seam guided, for example, along an outwardly oriented end face of the edge region 68.

Da die Gehäuseöffnung 48 in den im Wesentlichen ungekrümmten und in der Ebene E liegenden Bereich 66 des an der unteren Gehäuseschale 22 vorgesehenen Abschnitts der Umfangswandung 30 ausgebildet ist, kann diese bei beispielsweise kreisrunder Querschnittskontur des Auslassrohrs 46 in seinem die Gehäuseöffnung 48 durchsetzenden Längenbereich 50 in vergleichsweise einfacher geometrischer Ausgestaltung, insbesondere mit elliptischer Umfangskontur bereitgestellt werden, da das Auslassrohr 46 derart orientiert ist, dass dessen durch die Gehäuseöffnung 48 sich hindurch erstreckender Längenbereich 50 mit seiner in diesem Längenbereich 50 vorhandenen Längsmittenachse A bezüglich einer Öffnungsmittenachse M der Gehäuseöffnung 48 angewinkelt orientiert ist. Dabei steht die Öffnungsmittenachse M zu der Ebene E, in welcher der die Gehäuseöffnung 48 aufweisende Bereich 66 der unteren Gehäuseschale 22 liegt, im Wesentlichen orthogonal.Since the housing opening 48 is formed in the essentially non-curved region 66 of the section of the peripheral wall 30 provided on the lower housing shell 22 and lying in the plane E, this can be compared, for example, with a circular cross-sectional contour of the outlet pipe 46 in its length region 50 passing through the housing opening 48 simple geometric configuration, in particular with an elliptical circumferential contour, since the outlet pipe 46 is oriented in such a way that its length region 50, which extends through the housing opening 48, is oriented at an angle with its longitudinal center axis A present in this length region 50 with respect to an opening center axis M of the housing opening 48. The opening center axis M is essentially orthogonal to the plane E in which the region 66 of the lower housing shell 22 having the housing opening 48 lies.

Bei dem in den Fig. 1 bis 4 dargestellten Aufbau des Schalldämpfers 10 erstreckt das Auslassrohr 46, welches einstückig oder aus mehreren Rohrsegmenten aufgebaut sein kann, sich durch die Gehäuseöffnung 48 hindurch und über den Randbereich 68 hinaus. Dieser Längenbereich 50 des Auslassrohrs 46 ist einstückig ausgebildet und stellt eine Abgasaustrittsöffnung 70 des Auslassrohrs 46 bzw. des Schalldämpfers 10 bereit. Gleichwohl ist das Auslassrohr 46 mit seinem durch die Gehäuseöffnung 48 sich hindurch und außerhalb derselben sich erstreckenden Längenbereich 50 so gestaltet, dass es über die Gesamtaußenumfangskontur des Schalldämpfergehäuses 14 insbesondere nach unten hin im Wesentlichen nicht hervorsteht. Auch in Richtung der Gehäuselängsachse L steht das Auslassrohr 48 nicht über die Außenumfangskontur des Schalldämpfergehäuses 14 hervor, was in Fig. 4 deutlich zu erkennen ist. Somit wird eine sehr kompakte und wenig Bauraum im Bereich eines Unterbodens eines Fahrzeugs beanspruchende Bauweise des Schalldämpfers 10 erreicht, bei welcher gleichwohl das vergleichsweise große Volumen im Schalldämpferinnenraum 24 effizient zur Schalldämmung genutzt werden kann. Da die vom Auslassrohr 46 durchsetzte Gehäuseöffnung 48 vollständig in einem der Gehäuseteile 16, 18, insbesondere der unteren Gehäuseschale 22, ausgebildet ist, wird in demjenigen Bereich, in welchem das Auslassrohr 46 diese Gehäuseöffnung 48 durchsetzt und mit dem diese Gehäuseöffnung 48 bereitstellenden Gehäuseteil 18 durch Verschweißen verbunden wird, nur eine Verbindung zwischen zwei Bauteilen erreicht, welche in vergleichsweise einfacher Art und Weise mit hoher Präzision und somit wenig Ausschuss bei der Herstellung eines derartigen Schalldämpfers 10 erzeugt werden kann. Da das Auslassrohr 46 mit seinem die Gehäuseöffnung 48 durchsetzenden und auch die Abgasaustrittsöffnung 70 bereitstellenden Längenbereich 50 nur vergleichsweise kurz über das Schalldämpfergehäuse 14 nach außen hervorsteht, besteht nicht die Gefahr, dass durch in einem Fahrzeug vorhandene Schwingungen ein Endrohr-Zittern auftritt.With the one in the Fig. 1 to 4 In the illustrated structure of the silencer 10, the outlet pipe 46, which can be constructed in one piece or from several pipe segments, extends through the housing opening 48 and over the edge region 68 out. This length region 50 of the outlet pipe 46 is formed in one piece and provides an exhaust gas outlet opening 70 of the outlet pipe 46 or the silencer 10. Nevertheless, the outlet pipe 46, with its length region 50 extending through the housing opening 48 and outside the same, is designed in such a way that it essentially does not protrude beyond the overall outer circumferential contour of the silencer housing 14, particularly downwards. Even in the direction of the longitudinal axis L of the housing, the outlet pipe 48 does not protrude beyond the outer circumferential contour of the silencer housing 14, which in Fig. 4 can be clearly seen. This results in a very compact design of the silencer 10 that takes up little space in the area of the underbody of a vehicle, in which the comparatively large volume in the interior of the silencer 24 can be used efficiently for sound insulation. Since the housing opening 48 through which the outlet pipe 46 passes is completely formed in one of the housing parts 16, 18, in particular the lower housing shell 22, in the area in which the outlet pipe 46 passes through this housing opening 48 and with the housing part 18 providing this housing opening 48 Welding is connected, only a connection between two components is achieved, which can be produced in a comparatively simple manner with high precision and thus little waste in the production of such a silencer 10. Since the outlet pipe 46, with its length region 50 which passes through the housing opening 48 and also provides the exhaust gas outlet opening 70, only protrudes outwards for a comparatively short time beyond the silencer housing 14, there is no risk of a tailpipe trembling occurring due to vibrations present in a vehicle.

Abschließend ist darauf hinzuweisen, dass, ohne von den Prinzipien der vorliegenden Erfindung abzuweichen, der in den Figuren dargestellte Schalldämpfer in verschiedenen Bereichen anders ausgeführt sein könnte. So könnten beispielsweise zwei oder mehrere Auslassrohre in der in den Figuren im Zusammenhang mit dem Auslassrohr 46 dargestellten Art und Weise aus dem Schalldämpfergehäuse 14 heraus geführt sein. Ferner könnte beispielsweise auch die in Zuordnung zu dem Einlassrohr 38 vorgesehene Gehäuseöffnung 36 vollständig in einer der beiden Gehäuseschalen 20, 22, vorzugsweise im Bereich der Umfangswandung 30 vorgesehen sein.Finally, it should be noted that, without departing from the principles of the present invention, the silencer shown in the figures could be designed differently in various areas. For example, two or more outlet pipes could be guided out of the silencer housing 14 in the manner shown in the figures in connection with the outlet pipe 46. Furthermore, for example, the housing opening 36 provided in association with the inlet pipe 38 could also be be provided completely in one of the two housing shells 20, 22, preferably in the area of the peripheral wall 30.

Claims (8)

  1. A silencer for an exhaust gas system of an internal combustion engine, comprising a silencer housing (14) which surrounds a silencer interior (24) with at least two housing portions (16, 18) which are adjacent to each other in an abutment region (29) and which are connected to each other and at least one outlet pipe (46) which extends through the silencer housing (14) in the region of a housing opening (48) which is formed in the silencer housing (14), wherein at least one housing opening (48) through which an outlet pipe (46) extends is completely formed in one of the housing portions (16, 18), wherein the silencer housing (14) comprises two housing shells (20, 22) which each provide a housing portion (16, 18) and which are each connected to each other in the abutment region (29) by means of material engagement and/or positive-locking engagement, wherein at least one housing opening (48) which is completely formed in one of the housing portions (20, 22) is formed in one of the housing shells (20, 22), wherein the silencer housing (14) presents a circumferential wall (30) which is elongate in the direction of a longitudinal housing axis (L) and comprises at both axial end regions of the circumferential wall (30) an end wall (32, 34) and in that at least one housing opening (48) which is completely formed in one of the housing portions (16, 18) is formed in the circumferential wall (30),
    characterized in that
    - at least one housing opening (48) which is completely formed in one of the housing shells (20, 22) is formed in a substantially non-curved region (66) of the circumferential wall (30), laying in a plane (E),
    - in at least one outlet pipe (46) passing through the silencer housing (14) in the region of a housing opening (48) formed completely in one of the housing shells (20, 22), a longitudinal centre axis (A) of this outlet pipe (46) is angled in the region of its longitudinal region (50) passing through the housing opening (48) with respect to an opening centre axis (M) which is essentially orthogonal to the plane (E),
    - in the region of at least one housing opening (48) formed completely in one of the housing shells (20, 22), the housing shell (20, 22) is deformed in the direction away from the silencer interior (24) to provide an edge region (68) surrounding this housing opening (48),
    - an outlet pipe (46) passing through at least one housing opening (48) formed completely in one of the housing shells (20, 22) is connected to the silencer housing (14) in the region of the edge region (68) surrounding this housing opening (48) by welding.
  2. The silencer as claimed in claim 1, characterized in that the silencer housing (14) is flattened orthogonally to the longitudinal housing axis (L), and in that at least one housing opening (48) which is completely formed in one of the housing shells (20, 22) is formed in a region of the circumferential wall (30) providing a broad side (60) of the silencer housing (14).
  3. The silencer as claimed in one of the preceding claims, characterized in that at least one outlet pipe (46) which extends through the silencer housing (14) in the region of a housing opening (48) which is completely formed in one of the housing shells (20, 22) does not protrude over the silencer housing (14) in the direction of a longitudinal housing axis (L).
  4. The silencer as claimed in one of the preceding claims, characterized in that an outlet pipe (46) which extends through at least one housing opening (48) which is completely formed in one of the housing shells (20, 22) extends out of the silencer interior (24) beyond the edge region (68) surrounding this housing opening (48).
  5. The silencer as claimed in one of the preceding claims, characterized in that an outlet pipe (46) which extends through at least one housing opening (48) which is completely formed in one of the housing shells (20, 22) terminates substantially flush with the edge region (68) surrounding this housing opening (48).
  6. The silencer as claimed in one of the preceding claims, characterized in that an outlet pipe (46) which extends through at least one housing opening (48) which is completely formed in one of the housing shells (16, 18) is constructed integrally with its longitudinal region (50) extending in the region of the housing opening (48) and outside the silencer interior (24) and provides an exhaust gas outlet opening (70) for discharging exhaust gas to the environment.
  7. An exhaust gas system for an internal combustion engine comprising a silencer (10) according to any one of the preceding claims.
  8. The exhaust gas system according to claim 7, characterized in that the silencer (10) is an end silencer, and in that an exhaust gas outlet opening (70) is provided on an outlet pipe (46) which extends through at least one housing opening (48) which is completely formed in one of the housing shells (16, 18) for discharging exhaust gas to the environment.
EP22172212.7A 2021-06-15 2022-05-09 Silencer for an exhaust gas system of a combustion engine Active EP4105456B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102021115392.1A DE102021115392A1 (en) 2021-06-15 2021-06-15 Silencer for an exhaust system of an internal combustion engine

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EP4105456A1 EP4105456A1 (en) 2022-12-21
EP4105456B1 true EP4105456B1 (en) 2024-01-03

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US (1) US11840948B2 (en)
EP (1) EP4105456B1 (en)
CN (1) CN115478928A (en)
DE (1) DE102021115392A1 (en)
ZA (1) ZA202206574B (en)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19611133A1 (en) * 1996-03-21 1997-09-25 Eberspaecher J Muffler arrangement
DE102011077183B4 (en) * 2011-06-08 2015-05-21 Eberspächer Exhaust Technology GmbH & Co. KG Silencer and manufacturing process
CN103174493A (en) * 2011-12-20 2013-06-26 凯特利迪克·科姆巴森公司 Quiet muffler
DE102012206871A1 (en) * 2012-04-25 2013-10-31 Friedrich Boysen Gmbh & Co. Kg Silencer for motor vehicle engine, comprises exhaust gas pipe fitting attached at exhaust gas inlet opening or exhaust gas outlet opening, where connection between exhaust pipe pipe fitting and housing is formed as soldered connection
DE102015102611A1 (en) * 2015-02-24 2016-08-25 Eberspächer Exhaust Technology GmbH & Co. KG Exhaust gas routing system for an internal combustion engine
DE102017124750A1 (en) * 2017-10-23 2019-04-25 Eberspächer Exhaust Technology GmbH & Co. KG Muffler insert, muffler with this and method of making a muffler insert
JP6667561B2 (en) 2018-01-26 2020-03-18 フタバ産業株式会社 Exhaust unit

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ZA202206574B (en) 2024-04-24
US11840948B2 (en) 2023-12-12
EP4105456A1 (en) 2022-12-21
CN115478928A (en) 2022-12-16
DE102021115392A1 (en) 2022-12-15
US20220397050A1 (en) 2022-12-15

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