EP3734033B1 - Exhaust silencer for an exhaust gas system of a combustion engine - Google Patents

Exhaust silencer for an exhaust gas system of a combustion engine Download PDF

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Publication number
EP3734033B1
EP3734033B1 EP20164452.3A EP20164452A EP3734033B1 EP 3734033 B1 EP3734033 B1 EP 3734033B1 EP 20164452 A EP20164452 A EP 20164452A EP 3734033 B1 EP3734033 B1 EP 3734033B1
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EP
European Patent Office
Prior art keywords
resonator
chamber
partition
pipe
flow volume
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
EP20164452.3A
Other languages
German (de)
French (fr)
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EP3734033B8 (en
EP3734033A1 (en
Inventor
Nicolas Mettenleiter
Thomas Uhlemann
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
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Eberspaecher Exhaust Technology GmbH and Co KG
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Publication of EP3734033A1 publication Critical patent/EP3734033A1/en
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Publication of EP3734033B8 publication Critical patent/EP3734033B8/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/02—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
    • F01N13/007—Apparatus used as intake or exhaust silencer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
    • 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
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/02—Two or more expansion chambers in series connected by means of 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
    • F01N2490/02—Two or more expansion chambers in series connected by means of tubes
    • F01N2490/04—Two or more expansion chambers in series connected by means of tubes the gases flowing longitudinally from inlet to outlet only in one 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
    • 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 an exhaust silencer for an exhaust system of an internal combustion engine.
  • Helmholtz resonators In order to be able to influence the sound damping behavior of exhaust silencers or to be able to predefine them in a defined manner, it is known to integrate Helmholtz resonators into such exhaust silencers.
  • a Helmholtz resonator comprises in an exhaust gas silencer a generally closed resonator volume in a resonator chamber that is not traversed by the exhaust gas flow passing through the exhaust gas silencer and which is open via a resonator neck to the flow volume inside a silencer housing through which the exhaust gas flow flows.
  • the volume of the resonator chamber and the dimensions of the resonator neck in particular the cross-sectional area of an opening in the resonator neck and the length of the resonator neck, it is possible to tune to particularly critical or relevant frequencies to be attenuated.
  • an exhaust silencer according to the preamble of claim 1 is known.
  • an exhaust gas inlet and an exhaust gas outlet are open to a flow volume formed between two resonator chambers.
  • a resonator neck is provided which is provided by a respective tube and via which a respective resonator chamber is open to the flow volume.
  • two Helmholtz resonators can be constructed with a single resonator tube, whereby each of these two Helmholtz resonators can be tuned to a particularly critical frequency by suitable dimensioning, i.e. the two Helmholtz resonators can be provided with different resonance frequencies.
  • the silencer housing can comprise a circumferential wall 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 two partition walls between the end walls, the first resonator chamber being separated from the flow volume by a first partition wall and the second resonator chamber by a second partition wall is separated from the flow volume.
  • the flow volume is to be regarded as the volume through which the exhaust gas flows in the interior of the silencer housing and which is provided in one or more chambers or pipes through which the exhaust gas flow flows.
  • the volume of the resonator chambers which is basically open to this flow volume via the resonator necks and into which exhaust gas can in principle also enter via the associated resonator necks, is nevertheless not part of the flow volume.
  • the flow volume can comprise a flow chamber formed between the first partition and the second partition.
  • This flow chamber can, for example, be the only chamber provided in the interior of the muffler housing and through which the exhaust gas flow to be conducted through the exhaust muffler can flow.
  • a plurality of partition walls formed via pipes and / or with openings chambers communicating with one another and through which the exhaust gas flow can flow may be provided.
  • the first resonator neck penetrate the first partition or / and be open to the first resonator chamber in the area of the first partition, and that the second resonator neck penetrate the second partition and / and in the area the second partition is open to the second resonator chamber.
  • the first partition next to the opening provided by the first resonator neck does not have an opening providing a connection between the flow volume and the first resonator chamber, and that the second partition next to the opening provided by the second resonator neck has no opening providing a connection between the flow volume and the second resonator chamber.
  • the resonator tube should have at least one connection in its section extending in the flow volume in a tube wall of the resonator tube having pipe wall opening between the flow volume and a pipe interior of the resonator pipe.
  • the resonator tube has an opening section with a plurality of tube wall openings in its section extending in the flow volume.
  • the effect of the resonator tube provided in association with two Helmholtz resonators as two resonator necks can be achieved, for example, by the resonator tube in a first length region adjoining the opening section at a first axial end region of the opening section provides the first resonator neck and provides the second resonator neck in a second length region adjoining the opening portion at a second axial end region of the opening section.
  • the first resonator chamber can be formed between one of the two end walls and the first partition wall
  • the second resonator chamber can be formed between the other of the two end walls and the second partition wall
  • Such a compact structure can be supported by the fact that the resonator tube penetrates the flow chamber and is open with a first axial end region to the first resonator chamber and / or lies in the first resonator chamber and is open with a second axial end region to the second resonator chamber and / or in the second resonator chamber, and that the resonator tube has the at least one tube wall opening in its section extending in the flow chamber.
  • the exhaust gas inlet comprises an inlet pipe which is open in the area of one of the two end walls and which provides an inlet channel
  • the exhaust gas outlet is in the area the other of the two end walls comprises an outlet pipe which is open and which provides an outlet channel
  • the inlet pipe can be passed through one of the two resonator chambers and the outlet pipe can be passed through the other of the two resonator chambers.
  • the inlet pipe nor the outlet pipe is open to the resonator chamber through which it passes, so that the resonator chambers actually only have a connection to the flow volume through the resonator necks assigned to them.
  • the inlet pipe can be open to the flow volume in the area of the intermediate wall separating one of the two resonator chambers from the flow volume
  • the outlet pipe can be open to the flow volume in the area of the intermediate housing wall separating the other of the two resonator chambers from the flow volume.
  • the first resonator chamber formed between one of the two end walls and the first partition wall and the flow chamber formed between the first partition wall and the second partition wall can be arranged in succession in the direction of the longitudinal axis of the housing and the second resonator chamber formed between the second intermediate wall and the other of the two end walls may be provided.
  • the two Helmholtz resonators provided therein and cooperating or constructed with a single resonator tube can be easily tuned to different resonance frequencies by the first resonator chamber and the second resonator chamber having different resonator chamber volumes and / or the first resonator neck and the second resonator neck have mutually different resonator neck lengths.
  • the resonator tube could also have different cross-sectional dimensions in the areas in which the resonator tube provides the two resonator necks in order to thereby also have an influence on the resonance frequencies or to be able to provide different resonance frequencies.
  • the resonator tube have a constant cross-sectional dimension over its entire length for a design that is particularly easy to realize structurally.
  • an exhaust silencer is generally designated 10.
  • the exhaust silencer 10 comprises a silencer housing 12 with a circumferential wall 14 which is elongated in the direction of a longitudinal axis A of the housing and is, for example, essentially cylindrical and, for example, constructed with sheet metal material and / or a form fit connected in a gas-tight manner.
  • a first intermediate wall 24 and a second intermediate wall 26 are connected to the peripheral wall 14 in an essentially gas-tight manner, for example by a material seal.
  • the end walls 20, 22 and the intermediate walls 24, 26 are also preferably made of sheet metal.
  • An exhaust gas inlet, generally designated 28, comprises an inlet pipe 30, which is connected to the end wall 20 provided at the axial end region 16 of the circumferential wall 14 on the one hand and the first intermediate wall 24 on the other hand, for example by a material seal, essentially gas-tight and in its interior an inlet channel leading to a flow chamber 32 34 provides.
  • the inlet pipe 30 thus forms an inlet opening of the exhaust gas inlet 28 that is open to the inlet channel 34.
  • the inlet pipe 30 is open to the flow chamber 32. It should be pointed out that in the illustrated embodiment, the inlet pipe 30 ends in the area of the first partition 24. This could also extend beyond the first partition 24 into the flow chamber 32.
  • An exhaust gas outlet generally designated 36, comprises an outlet pipe 38 connected in a gastight manner to the second partition 26 on the one hand and the end wall 22 provided on the axial end region 18 of the peripheral wall 14 on the other hand 10 can leave.
  • the outlet pipe 38 is with its outlet channel 40 to the environment or an area of an exhaust system that follows in the flow direction.
  • the outlet pipe 38 is connected to the latter or is open to the flow chamber 32. It should also be pointed out here that, contrary to what is shown, the outlet pipe 38 could extend beyond the second end wall 26 into the flow chamber 32.
  • both the inlet pipe 30 and the outlet pipe 38 can extend beyond the end walls 20 and 22 connected to them out of the muffler housing 12 in order to implement an easier connection to areas of an exhaust system following upstream or downstream be able.
  • the inlet channel 34, the outlet channel 40 and the flow chamber 32 provide a flow volume 42 through which the exhaust gas to be conducted through the exhaust silencer 10 can flow.
  • two resonator chambers 44, 46 are integrated into the exhaust gas silencer 10.
  • the first resonator chamber 44 which is essentially axially delimited by these walls, is assigned to a first Helmholtz resonator 48.
  • a second Helmholtz resonator 50 is assigned essentially through this axially delimited second resonator chamber 46.
  • the inlet pipe 30 passes through the first resonator chamber 44, the inlet pipe 30 not providing an opening that is open to the first resonator chamber 44, that is to say it is closed off from the latter.
  • the outlet pipe 38 passes through the second resonator chamber 46 and likewise has no opening open to it, so that the outlet pipe 38 is basically closed off from the second resonator chamber 46.
  • a resonator tube generally designated 52 In the interior of the muffler housing 12, a resonator tube generally designated 52 is provided.
  • the resonator tube 52 basically has three length regions 54, 56, 58 adjoining one another in the direction of the housing longitudinal axis A.
  • the length area 54 of the resonator tube 52 which is positioned approximately in the mid-length area of the resonator tube 52, constitutes an opening section 60 ready, in which the resonator tube 52 or a tube interior formed therein is open to the flow chamber 32 or to the flow volume 42 via a plurality of tube wall openings 64 provided in a tube wall 62 of the resonator tube 52.
  • the pipe wall openings 64 can for example be arranged in a plurality of rows of openings extending in the direction of the housing longitudinal axis A in a substantially regular opening pattern and thus a substantially uniformly acting connection between the pipe interior and the flow chamber 32 in the circumferential direction of the pipe wall 62 of the resonator pipe 52 manufacture.
  • the axial end region 66 of the opening section 60 closer to the first partition wall 24 forms a first resonator neck 68 of the first Helmholtz resonator 48.
  • the length region 56 or the first resonator neck 68 provided by this length region 56 penetrates an opening in the first Intermediate wall 24 and is preferably connected to this in a substantially gas-tight manner.
  • a first axial end region 70 of the resonator tube 52 which in the example shown extends beyond the first partition wall 24 and is positioned and engages into the first resonator chamber 44, the resonator tube 52 or the first resonator neck 68 is open to the first resonator chamber 44 and is thus in Connection with this essentially the first Helmholtz resonator 48 ready.
  • the first partition wall 24 has no further openings that establish a connection between the first resonator chamber 24 and the flow volume 42 or the flow chamber 32 of the same.
  • the length region 58 forms a second resonator neck 74 and is open to the second resonator chamber 26 in the region of a second axial end region 76 of the resonator tube 52.
  • the second length region 58 extends beyond the second end wall 26 and engages in the second resonator chamber 46 and in connection therewith essentially provides the second Helmholtz resonator 50.
  • the second partition 26 also has no further openings which provide a connection between the second resonator chamber 46 and the flow volume 42 or the flow chamber 32.
  • the volumes of the two resonator chambers 44, 46 which volumes are essentially limited by the end walls 20, 22 and intermediate walls 24, 26 axially delimiting the resonator chambers 44, 46 and the peripheral wall 14, and of which the inlet pipe 30 or
  • the volume occupied by the outlet pipe 38 is to be subtracted, and the appropriately suitable dimensioning of the resonator necks 68, 74 allows the resonance frequencies of the two Helmholtz resonators 48, 50 to be fixed or matched to particularly critical frequencies in a defined manner.
  • the resonator tube 52 is designed in the direction of the housing longitudinal axis A with an essentially constant cross-sectional dimension, in particular also with a constant inner diameter, so that an influence on the respective resonance frequency of the Helmholtz resonators in the area of Resonator necks 68, 74 are taken essentially by suitable selection of the length thereof.
  • This in turn can take place in that the opening section 54 is positioned appropriately between the two axial end regions 70, 76 of the Resonator 52, however, is arranged within the axial extent of the resonator chamber 32 and is also provided with a suitable extension in the direction of the longitudinal axis A of the housing.
  • the two resonator chambers 44, 46 are each arranged axially directly adjacent to the flow volume 42 through which the resonator tube 52 passes, in particular the flow chamber 32, in the construction according to the invention, on the one hand, an axially compact design is achieved and, on the other hand, the possibility is created that the only one Resonator tube 52 which can provide the resonator necks 68, 74 assigned to the two Helmholtz resonators 48, 50.
  • the flow volume has several flow chambers.
  • a further partition could be provided between the two partition walls 24, 26, in which a connection is established between these chambers, for example through one or more openings and / or one or more tubes penetrating them, so that the fluid flowing from the inlet 28 to the outlet 36 Exhaust gas can flow through all these chambers.
  • the opening section 54 could then be arranged in one of these chambers or could be arranged lying in both chambers or could be divided into two areas, each of which is positioned in one of the flow chambers assigned to the flow volume 42.
  • no further partition dividing the flow volume 42 into several chambers is provided between the first partition 24 and the second partition 26.
  • the exhaust gas outlet could also have a plurality of outlet pipes, then for example forming respective tail pipes.

Description

Die vorliegende Erfindung betrifft einen Abgasschalldämpfer für eine Abgasanlage einer Brennkraftmaschine.The present invention relates to an exhaust silencer for an exhaust system of an internal combustion engine.

Um das Schalldämpfungsverhalten von Abgasschalldämpfern beeinflussen bzw. definiert vorgeben zu können, ist es bekannt, in derartige Abgasschalldämpfer Helmholtz-Resonatoren zu integrieren. Ein derartiger Helmholtz-Resonator umfasst in einem Abgasschalldämpfer ein im Allgemeinen grundsätzlich abgeschlossenes, also von dem durch den Abgasschalldämpfer hindurchgeführten Abgasstrom nicht durchströmtes Resonatorvolumen in einer Resonatorkammer, die über einen Resonatorhals zu dem von dem Abgasstrom durchströmten Strömungsvolumen im Inneren eines Schalldämpfergehäuses offen ist. Durch die geeignete Auswahl des Volumens der Resonatorkammer und der Abmessung des Resonatorhalses, insbesondere der Querschnittsfläche einer Öffnung des Resonatorhalses und der Länge des Resonatorhalses, kann eine Abstimmung auf besonders kritische bzw. relevante zu bedämpfende Frequenzen vorgenommen werden.In order to be able to influence the sound damping behavior of exhaust silencers or to be able to predefine them in a defined manner, it is known to integrate Helmholtz resonators into such exhaust silencers. Such a Helmholtz resonator comprises in an exhaust gas silencer a generally closed resonator volume in a resonator chamber that is not traversed by the exhaust gas flow passing through the exhaust gas silencer and which is open via a resonator neck to the flow volume inside a silencer housing through which the exhaust gas flow flows. By suitably selecting the volume of the resonator chamber and the dimensions of the resonator neck, in particular the cross-sectional area of an opening in the resonator neck and the length of the resonator neck, it is possible to tune to particularly critical or relevant frequencies to be attenuated.

Aus der EP 3 098 413 A1 ist ein Abgasschalldämpfer gemäß dem Oberbegriff des Anspruchs 1 bekannt. Bei diesem Abgasschalldämpfer sind ein Abgaseinlass und ein Abgasauslass zu einem zwischen zwei Resonatorkammern gebildeten Strömungsvolumen offen. In Zuordnung zu jeder Resonatorkammer ist ein durch ein jeweiliges Rohr bereitgestellter Resonatorhals vorgesehen, über welchen eine jeweilige Resonatorkammer zu dem Strömungsvolumen offen ist.From the EP 3 098 413 A1 an exhaust silencer according to the preamble of claim 1 is known. In this exhaust silencer, an exhaust gas inlet and an exhaust gas outlet are open to a flow volume formed between two resonator chambers. In association with each resonator chamber, a resonator neck is provided which is provided by a respective tube and via which a respective resonator chamber is open to the flow volume.

Es ist die Aufgabe der vorliegenden Erfindung, einen Abgasschalldämpfer für eine Abgasanlage einer Brennkraftmaschine, insbesondere in einem Fahrzeug, vorzusehen, welcher bei baulich einfacher Ausgestaltung ein breites Schalldämpfungsspektrum bereitstellt.It is the object of the present invention to provide an exhaust silencer for an exhaust system of an internal combustion engine, in particular in a vehicle, which provides a broad spectrum of sound attenuation with a structurally simple design.

Erfindungsgemäß wird diese Aufgabe gelöst durch einen Abgasschalldämpfer für eine Abgasanlage einer Brennkraftmaschine, insbesondere in einem Fahrzeug, umfassend in einem Schalldämpfergehäuse:

  • ein von Abgas durchströmbares Strömungsvolumen mit einem Abgaseinlass und einem Abgasauslass,
  • eine über einen ersten Resonatorhals zu dem Strömungsvolumen offene erste Resonatorkammer,
  • eine über einen zweiten Resonatorhals zu dem Strömungsvolumen offene zweite Resonatorkammer,
  • ein den ersten Resonatorhals und den zweiten Resonatorhals bereitstellendes Resonatorrohr.
According to the invention, this object is achieved by an exhaust silencer for an exhaust system of an internal combustion engine, in particular in a vehicle, comprising in a silencer housing:
  • a flow volume through which exhaust gas can flow, with an exhaust gas inlet and an exhaust gas outlet,
  • a first resonator chamber open to the flow volume via a first resonator neck,
  • a second resonator chamber open to the flow volume via a second resonator neck,
  • a resonator tube providing the first resonator neck and the second resonator neck.

Bei einem erfindungsgemäß aufgebauten Abgasschalldämpfer können mit einem einzigen Resonatorrohr zwei Helmholtz-Resonatoren aufgebaut werden, wobei jeder dieser beiden Helmholtz-Resonatoren durch geeignete Dimensionierung auf eine besonders kritische Frequenz abgestimmt werden kann, die beiden Helmholtz-Resonatoren also mit unterschiedlichen Resonanzfrequenzen bereitgestellt werden können. Dies führt bei technisch einfach zu realisierender und eine geringe Anzahl an Bauteilen erfordernder Ausgestaltung zu einem durch den Einsatz zweier Helmholtz-Resonatoren erweiterten Dämpfungsspektrum.In the case of an exhaust silencer constructed according to the invention, two Helmholtz resonators can be constructed with a single resonator tube, whereby each of these two Helmholtz resonators can be tuned to a particularly critical frequency by suitable dimensioning, i.e. the two Helmholtz resonators can be provided with different resonance frequencies. In the case of a design that is technically easy to implement and requires a small number of components, this leads to an attenuation spectrum that is expanded through the use of two Helmholtz resonators.

Das Schalldämpfergehäuse kann eine in Richtung einer Gehäuselängsachse langgestreckte Umfangswand und an beiden axialen Endbereichen der Umfangswand jeweils eine Stirnwand sowie zwischen den Stirnwänden wenigstens zwei Zwischenwände umfassen, wobei die erste Resonatorkammer durch eine erste Zwischenwand von dem Strömungsvolumen getrennt ist und die zweite Resonatorkammer durch eine zweite Zwischenwand von dem Strömungsvolumen getrennt ist. Es ist in diesem Zusammenhang darauf hinzuweisen, dass im Sinne der vorliegenden Erfindung das Strömungsvolumen als das im Inneren des Schalldämpfergehäuses von dem Abgas durchströmte und in einer oder mehreren Kammern bzw. von dem Abgasstrom durchströmten Rohren bereitgestellte Volumen zu betrachten ist. Das Volumen der Resonatorkammern, das über die Resonatorhälse zu diesem Strömungsvolumen grundsätzlich offen ist und in welches über die zugeordneten Resonatorhälse grundsätzlich auch Abgas eintreten kann, ist gleichwohl nicht Teil des Strömungsvolumens.The silencer housing can comprise a circumferential wall 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 two partition walls between the end walls, the first resonator chamber being separated from the flow volume by a first partition wall and the second resonator chamber by a second partition wall is separated from the flow volume. It should be pointed out in this context that, in the context of the present invention, the flow volume is to be regarded as the volume through which the exhaust gas flows in the interior of the silencer housing and which is provided in one or more chambers or pipes through which the exhaust gas flow flows. The volume of the resonator chambers, which is basically open to this flow volume via the resonator necks and into which exhaust gas can in principle also enter via the associated resonator necks, is nevertheless not part of the flow volume.

Das Strömungsvolumen kann eine zwischen der ersten Zwischenwand und der zweiten Zwischenwand gebildete Strömungskammer umfassen. Diese Strömungskammer kann beispielsweise die einzige im Inneren des Schalldämpfergehäuses bereitgestellte und von dem durch den Abgasschalldämpfer hindurch zu leitenden Abgasstrom durchströmbare Kammer sein. Es können aber auch mehrere über Rohre oder/und mit Öffnungen ausgebildete Zwischenwände miteinander kommunizierende und von dem Abgasstrom durchströmbare Kammern vorgesehen sein.The flow volume can comprise a flow chamber formed between the first partition and the second partition. This flow chamber can, for example, be the only chamber provided in the interior of the muffler housing and through which the exhaust gas flow to be conducted through the exhaust muffler can flow. However, it is also possible for a plurality of partition walls formed via pipes and / or with openings chambers communicating with one another and through which the exhaust gas flow can flow may be provided.

Um eine Verbindung der Resonatorkammern mit dem Strömungsvolumen bereitzustellen, wird vorgeschlagen, dass der erste Resonatorhals die erste Zwischenwand durchsetzt oder/und im Bereich der ersten Zwischenwand zu der ersten Resonatorkammer offen ist, und dass der zweite Resonatorhals die zweite Zwischenwand durchsetzt oder/und im Bereich der zweiten Zwischenwand zu der zweiten Resonatorkammer offen ist. Um dabei die Volumina der Resonatorkammern effizient für die damit bereitzustellenden Helmholtz-Resonatoren nutzen zu können, ist vorzugsweise weiter vorgesehen, dass die erste Zwischenwand neben der durch den ersten Resonatorhals bereitgestellten Öffnung keine eine Verbindung zwischen dem Strömungsvolumen und der ersten Resonatorkammer bereitstellende Öffnung aufweist, und dass die zweite Zwischenwand neben der durch den zweiten Resonatorhals bereitgestellten Öffnung keine eine Verbindung zwischen dem Strömungsvolumen und der zweiten Resonatorkammer bereitstellende Öffnung aufweist.In order to provide a connection between the resonator chambers and the flow volume, it is proposed that the first resonator neck penetrate the first partition or / and be open to the first resonator chamber in the area of the first partition, and that the second resonator neck penetrate the second partition and / and in the area the second partition is open to the second resonator chamber. In order to be able to use the volumes of the resonator chambers efficiently for the Helmholtz resonators to be provided with them, it is preferably further provided that the first partition next to the opening provided by the first resonator neck does not have an opening providing a connection between the flow volume and the first resonator chamber, and that the second partition next to the opening provided by the second resonator neck has no opening providing a connection between the flow volume and the second resonator chamber.

Um bei Ausgestaltung mit einem einzigen Resonatorrohr für zwei Helmholtz-Resonatoren eine Verbindung der durch dieses Resonatorrohr bereitgestellten Resonatorhälse mit dem Strömungsvolumen bereitstellen zu können, wird vorgeschlagen, dass das Resonatorrohr in seinem in dem Strömungsvolumen sich erstreckenden Abschnitt in einer Rohrwand des Resonatorrohrs wenigstens eine eine Verbindung zwischen dem Strömungsvolumen und einem Rohrinnenraum des Resonatorrohrs herstellende Rohrwandöffnung aufweist. Insbesondere kann dabei vorgesehen sein, dass das Resonatorrohr in seinem in dem Strömungsvolumen sich erstreckenden Abschnitt einen Öffnungsabschnitt mit einer Mehrzahl von Rohrwandöffnungen aufweist.In order to be able to provide a connection between the resonator necks provided by this resonator tube and the flow volume in the configuration with a single resonator tube for two Helmholtz resonators, it is proposed that the resonator tube should have at least one connection in its section extending in the flow volume in a tube wall of the resonator tube having pipe wall opening between the flow volume and a pipe interior of the resonator pipe. In particular, it can be provided that the resonator tube has an opening section with a plurality of tube wall openings in its section extending in the flow volume.

Die Wirkung des in Zuordnung zu zwei Helmholtz-Resonatoren vorgesehenen Resonatorrohrs als zwei Resonatorhälse kann beispielsweise dadurch erreicht werden, dass das Resonatorrohr in einem an einem ersten axialen Endbereich des Öffnungsabschnitts an den Öffnungsabschnitt anschließenden ersten Längenbereich den ersten Resonatorhals bereitstellt und in einem an einem zweiten axialen Endbereich des Öffnungsabschnitts an den Öffnungsabschnitt anschließenden zweiten Längenbereich den zweiten Resonatorhals bereitstellt.The effect of the resonator tube provided in association with two Helmholtz resonators as two resonator necks can be achieved, for example, by the resonator tube in a first length region adjoining the opening section at a first axial end region of the opening section provides the first resonator neck and provides the second resonator neck in a second length region adjoining the opening portion at a second axial end region of the opening section.

Für einen kompakten Aufbau kann die erste Resonatorkammer zwischen einer der beiden Stirnwände und der ersten Zwischenwand gebildet sein, und die zweite Resonatorkammer kann zwischen der anderen der beiden Stirnwände und der zweiten Zwischenwand gebildet sein.For a compact structure, the first resonator chamber can be formed between one of the two end walls and the first partition wall, and the second resonator chamber can be formed between the other of the two end walls and the second partition wall.

Ein derartiger kompakter Aufbau kann dadurch unterstützt werden, dass das Resonatorrohr die Strömungskammer durchsetzt und mit einem ersten axialen Endbereich zur ersten Resonatorkammer offen ist oder/und in der ersten Resonatorkammer liegt und mit einem zweiten axialen Endbereich zur zweiten Resonatorkammer offen ist oder/und in der zweiten Resonatorkammer liegt, und dass das Resonatorrohr in seinem in der Strömungskammer sich erstreckenden Abschnitt die wenigstens eine Rohrwandöffnung aufweist.Such a compact structure can be supported by the fact that the resonator tube penetrates the flow chamber and is open with a first axial end region to the first resonator chamber and / or lies in the first resonator chamber and is open with a second axial end region to the second resonator chamber and / or in the second resonator chamber, and that the resonator tube has the at least one tube wall opening in its section extending in the flow chamber.

Um den durch den Abgasschalldämpfer hindurch zu führenden Abgasstrom in diesen einleiten zu können und aus diesem wieder abführen zu können, wird vorgeschlagen, dass der Abgaseinlass ein im Bereich einer der beiden Stirnwände offenes und einen Einlasskanal bereitstellendes Einlassrohr umfasst, und dass der Abgasauslass ein im Bereich der anderen der beiden Stirnwände offenes und einen Auslasskanal bereitstellendes Auslassrohr umfasst.In order to be able to introduce the exhaust gas flow to be guided through the exhaust gas silencer into the latter and to be able to discharge it again from it, it is proposed that the exhaust gas inlet comprises an inlet pipe which is open in the area of one of the two end walls and which provides an inlet channel, and that the exhaust gas outlet is in the area the other of the two end walls comprises an outlet pipe which is open and which provides an outlet channel.

Um eine Strömungsverbindung mit dem Strömungsvolumen bzw. der dieses bzw. einen wesentlichen Teil desselben bereitstellenden Strömungskammer erhalten zu können, kann das Einlassrohr durch eine der beiden Resonatorkammern hindurchgeführt sein, und das Auslassrohr kann durch die andere der beiden Resonatorkammern hindurchgeführt sein. Dabei kann insbesondere vorgesehen sein, dass weder das Einlassrohr, noch das Auslassrohr zu der von diesem jeweils durchsetzten Resonatorkammer offen ist, so dass die Resonatorkammern tatsächlich nur durch die diesen jeweils zugeordneten Resonatorhälse eine Verbindung zum Strömungsvolumen haben.In order to be able to obtain a flow connection with the flow volume or the flow chamber providing this or a substantial part of it, the inlet pipe can be passed through one of the two resonator chambers and the outlet pipe can be passed through the other of the two resonator chambers. In particular, it can be provided that neither the inlet pipe nor the outlet pipe is open to the resonator chamber through which it passes, so that the resonator chambers actually only have a connection to the flow volume through the resonator necks assigned to them.

Ferner kann das Einlassrohr im Bereich der die eine der beiden Resonatorkammern von dem Strömungsvolumen trennenden Zwischenwand zu dem Strömungsvolumen offen sein, und das Auslassrohr kann im Bereich der die andere der beiden Resonatorkammern von dem Strömungsvolumen trennenden Gehäusezwischenwand zu dem Strömungsvolumen offen sein.Furthermore, the inlet pipe can be open to the flow volume in the area of the intermediate wall separating one of the two resonator chambers from the flow volume, and the outlet pipe can be open to the flow volume in the area of the intermediate housing wall separating the other of the two resonator chambers from the flow volume.

Um bei kompakter Bauart die Wechselwirkung des in Zuordnung zu zwei Helmholtz-Resonatoren vorgesehenen Resonatorrohrs zu ermöglichen, können in Richtung der Gehäuselängsachse aufeinanderfolgend die zwischen einer der beiden Stirnwände und der ersten Zwischenwand gebildete erste Resonatorkammer, die zwischen der ersten Zwischenwand und der zweiten Zwischenwand gebildete Strömungskammer und die zwischen der zweiten Zwischenwand und der anderen der beiden Stirnwände gebildete zweite Resonatorkammer vorgesehen sein.In order to enable the interaction of the resonator tube provided in association with two Helmholtz resonators with a compact design, the first resonator chamber formed between one of the two end walls and the first partition wall and the flow chamber formed between the first partition wall and the second partition wall can be arranged in succession in the direction of the longitudinal axis of the housing and the second resonator chamber formed between the second intermediate wall and the other of the two end walls may be provided.

Bei dem erfindungsgemäßen Abgasschalldämpfer können die beiden darin vorgesehenen und mit einem einzigen Resonatorrohr zusammenwirkenden bzw. aufgebauten Helmholtz-Resonatoren einfach auf unterschiedliche Resonanzfrequenzen abgestimmt werden, indem die erste Resonatorkammer und die zweite Resonatorkammer zueinander unterschiedliche Resonatorkammervolumina aufweisen oder/und der erste Resonatorhals und der zweite Resonatorhals zueinander unterschiedliche Resonatorhalslängen aufweisen. Grundsätzlich könnte auch in den Bereichen, in welchen das Resonatorrohr die beiden Resonatorhälse bereitstellt, das Resonatorrohr unterschiedliche Querschnittsabmessungen aufweisen, um auch dadurch einen Einfluss auf die Resonanzfrequenzen zu nehmen bzw. unterschiedliche Resonanzfrequenzen bereitstellen zu können. Da jedoch insbesondere die Auswahl der Länge der Resonatorhälse im Kontext der Ausgestaltung des Resonatorrohrs eine deutlich einfachere Möglichkeit der Beeinflussung der Resonanzfrequenzen bietet, wird für eine baulich besonders einfach zu realisierende Ausgestaltung vorgeschlagen, dass das Resonatorrohr über seine gesamte Länge eine konstante Querschnittsabmessung aufweist.In the exhaust gas silencer according to the invention, the two Helmholtz resonators provided therein and cooperating or constructed with a single resonator tube can be easily tuned to different resonance frequencies by the first resonator chamber and the second resonator chamber having different resonator chamber volumes and / or the first resonator neck and the second resonator neck have mutually different resonator neck lengths. In principle, the resonator tube could also have different cross-sectional dimensions in the areas in which the resonator tube provides the two resonator necks in order to thereby also have an influence on the resonance frequencies or to be able to provide different resonance frequencies. However, since in particular the selection of the length of the resonator necks in the context of the design of the resonator tube offers a much simpler way of influencing the resonance frequencies, it is proposed that the resonator tube have a constant cross-sectional dimension over its entire length for a design that is particularly easy to realize structurally.

Die vorliegende Erfindung wird nachfolgend mit Bezug auf die beiliegende Fig. 1 detailliert beschrieben, welche einen offen dargestellten Abgasschalldämpfer zeigt.The present invention will be explained hereinafter with reference to the accompanying Fig. 1 described in detail, which shows an exhaust silencer shown openly.

In Fig. 1 ist ein Abgasschalldämpfer allgemein mit 10 bezeichnet. Der Abgasschalldämpfer 10 umfasst ein Schalldämpfergehäuse 12 mit einer in Richtung einer Gehäuselängsachse A langgestreckten, beispielsweise im Wesentlichen zylindrisch ausgebildeten und z.B. mit Blechmaterial aufgebauten Umfangswand 14. An beiden axialen Endbereichen 16, 18 ist die Umfangswand 14 jeweils mit einer Stirnwand 20, 22 beispielsweise durch Materialschluss oder/und Formschluss gasdicht verbunden. In zwischen den beiden Stirnwänden 20, 22 liegenden Längenbereichen sind mit der Umfangswand 14 eine erste Zwischenwand 24 und eine zweite Zwischenwand 26 beispielsweise durch Materialschluss im Wesentlichen gasdicht verbunden. Auch die Stirnwände 20, 22 und die Zwischenwände 24, 26 sind vorzugsweise aus Blechmaterial hergestellt.In Fig. 1 an exhaust silencer is generally designated 10. The exhaust silencer 10 comprises a silencer housing 12 with a circumferential wall 14 which is elongated in the direction of a longitudinal axis A of the housing and is, for example, essentially cylindrical and, for example, constructed with sheet metal material and / or a form fit connected in a gas-tight manner. In the length regions lying between the two end walls 20, 22, a first intermediate wall 24 and a second intermediate wall 26 are connected to the peripheral wall 14 in an essentially gas-tight manner, for example by a material seal. The end walls 20, 22 and the intermediate walls 24, 26 are also preferably made of sheet metal.

Ein allgemein mit 28 bezeichneter Abgaseinlass umfasst ein Einlassrohr 30, das an die am axialen Endbereich 16 der Umfangswand 14 vorgesehene Stirnwand 20 einerseits und die erste Zwischenwand 24 andererseits beispielsweise durch Materialschluss im Wesentlichen gasdicht angeschlossen ist und in seinem Inneren einen zu einer Strömungskammer 32 führenden Einlasskanal 34 bereitstellt. Im Bereich der Stirnwand 20 bildet somit das Einlassrohr 30 eine zu dem Einlasskanal 34 offene Einlassöffnung des Abgaseinlasses 28. Im Bereich der ersten Zwischenwand 24 ist das Einlassrohr 30 zu der Strömungskammer 32 offen. Dabei ist darauf hinzuweisen, dass im dargestellten Ausgestaltungsbeispiel das Einlassrohr 30 im Bereich der ersten Zwischenwand 24 endet. Dieses könnte auch über die erste Zwischenwand 24 hinaus sich in die Strömungskammer 32 hinein erstrecken.An exhaust gas inlet, generally designated 28, comprises an inlet pipe 30, which is connected to the end wall 20 provided at the axial end region 16 of the circumferential wall 14 on the one hand and the first intermediate wall 24 on the other hand, for example by a material seal, essentially gas-tight and in its interior an inlet channel leading to a flow chamber 32 34 provides. In the area of the end wall 20, the inlet pipe 30 thus forms an inlet opening of the exhaust gas inlet 28 that is open to the inlet channel 34. In the area of the first partition 24, the inlet pipe 30 is open to the flow chamber 32. It should be pointed out that in the illustrated embodiment, the inlet pipe 30 ends in the area of the first partition 24. This could also extend beyond the first partition 24 into the flow chamber 32.

Ein allgemein mit 36 bezeichneter Abgasauslass umfasst ein an die zweite Zwischenwand 26 einerseits und die am axialen Endbereich 18 der Umfangswand 14 vorgesehene Stirnwand 22 andererseits gasdicht angebundenes Auslassrohr 38. Im Auslassrohr 38 ist ein Auslasskanal 40 gebildet, über welchen die Strömungskammer 32 durchströmendes Abgas den Abgasschalldämpfer 10 verlassen kann. Im Bereich der Stirnwand 22 ist das Auslassrohr 38 mit seinem Auslasskanal 40 zur Umgebung bzw. einem in Strömungsrichtung folgenden Bereich einer Abgasanlage offen. Im Bereich der zweiten Zwischenwand 26 ist das Auslassrohr 38 an diese angebunden bzw. zur Strömungskammer 32 offen. Es ist auch hier darauf hinzuweisen, dass, anders als dargestellt, das Auslassrohr 38 sich über die zweite Stirnwand 26 hinausgehend in die Strömungskammer 32 hinein erstrecken könnte. Ferner ist darauf hinzuweisen, dass sowohl das Einlassrohr 30, als auch das Auslassrohr 38 hinausgehend über die damit verbundenen Stirnwände 20 bzw. 22 sich aus dem Schalldämpfergehäuse 12 hinaus erstrecken können, um eine leichtere Anbindung an stromaufwärts bzw. stromabwärts folgende Bereiche einer Abgasanlage realisieren zu können.An exhaust gas outlet, generally designated 36, comprises an outlet pipe 38 connected in a gastight manner to the second partition 26 on the one hand and the end wall 22 provided on the axial end region 18 of the peripheral wall 14 on the other hand 10 can leave. In the area of the end wall 22, the outlet pipe 38 is with its outlet channel 40 to the environment or an area of an exhaust system that follows in the flow direction. In the area of the second intermediate wall 26, the outlet pipe 38 is connected to the latter or is open to the flow chamber 32. It should also be pointed out here that, contrary to what is shown, the outlet pipe 38 could extend beyond the second end wall 26 into the flow chamber 32. It should also be pointed out that both the inlet pipe 30 and the outlet pipe 38 can extend beyond the end walls 20 and 22 connected to them out of the muffler housing 12 in order to implement an easier connection to areas of an exhaust system following upstream or downstream be able.

Der Einlasskanal 34, der Auslasskanal 40 und die Strömungskammer 32 stellen in dem dargestellten Beispiel ein von dem durch den Abgasschalldämpfer 10 hindurch zu leitenden Abgas durchströmbares Strömungsvolumen 42 bereit. Zusätzlich zu diesem Strömungsvolumen 42 sind in den Abgasschalldämpfer 10 zwei Resonatorkammern 44, 46 integriert. Die zwischen der Stirnwand 20 und der ersten Zwischenwand 24 gebildete, d. h. im Wesentlichen axial durch diese Wände begrenzte erste Resonatorkammer 44 ist einem ersten Helmholtz-Resonator 48 zugeordnet. Die zwischen der zweiten Zwischenwand 26 und der Stirnwand 22 gebildete, d. h. im Wesentlichen durch diese axial begrenzte zweite Resonatorkammer 46 ist einem zweiten Helmholtz-Resonator 50 zugeordnet. Dabei durchsetzt das Einlassrohr 30 die erste Resonatorkammer 44, wobei das Einlassrohr 30 keine zur ersten Resonatorkammer 44 offene Öffnung bereitstellt, gegenüber dieser also abgeschlossen ist. Das Auslassrohr 38 durchsetzt die zweite Resonatorkammer 46 und weist gleichermaßen keine zu dieser offene Öffnung auf, so dass das Auslassrohr 38 gegenüber der zweiten Resonatorkammer 46 grundsätzlich abgeschlossen ist.In the example shown, the inlet channel 34, the outlet channel 40 and the flow chamber 32 provide a flow volume 42 through which the exhaust gas to be conducted through the exhaust silencer 10 can flow. In addition to this flow volume 42, two resonator chambers 44, 46 are integrated into the exhaust gas silencer 10. The one formed between the end wall 20 and the first intermediate wall 24, i. H. The first resonator chamber 44, which is essentially axially delimited by these walls, is assigned to a first Helmholtz resonator 48. The one formed between the second intermediate wall 26 and the end wall 22, i. H. A second Helmholtz resonator 50 is assigned essentially through this axially delimited second resonator chamber 46. In this case, the inlet pipe 30 passes through the first resonator chamber 44, the inlet pipe 30 not providing an opening that is open to the first resonator chamber 44, that is to say it is closed off from the latter. The outlet pipe 38 passes through the second resonator chamber 46 and likewise has no opening open to it, so that the outlet pipe 38 is basically closed off from the second resonator chamber 46.

Im Inneren des Schalldämpfergehäuses 12 ist ein allgemein mit 52 bezeichnetes Resonatorrohr vorgesehen. Das Resonatorrohr 52 weist grundsätzlich drei in Richtung der Gehäuselängsachse A aneinander anschließende Längenbereiche 54, 56, 58 auf. Der näherungsweise im Längenmittenbereich des Resonatorrohrs 52 positionierte Längenbereich 54 des Resonatorrohrs 52 stellt einen Öffnungsabschnitt 60 bereit, in welchem das Resonatorrohr 52 bzw. ein darin gebildeter Rohrinnenraum über eine Vielzahl von in einer Rohrwand 62 des Resonatorrohrs 52 vorgesehenen Rohrwandöffnungen 64 zur Strömungskammer 32 bzw. zum Strömungsvolumen 42 offen ist. Die Rohrwandöffnungen 64 können beispielsweise in einer Vielzahl von in Richtung der Gehäuselängsachse A sich erstreckenden Reihen von Öffnungen in einem im Wesentlichen regelmäßigen Öffnungsmuster angeordnet sein und somit in Umfangsrichtung der Rohrwand 62 des Resonatorrohrs 52 eine im Wesentlichen gleichmäßig wirkende Verbindung zwischen dem Rohrinnenraum und der Strömungskammer 32 herstellen.In the interior of the muffler housing 12, a resonator tube generally designated 52 is provided. The resonator tube 52 basically has three length regions 54, 56, 58 adjoining one another in the direction of the housing longitudinal axis A. The length area 54 of the resonator tube 52, which is positioned approximately in the mid-length area of the resonator tube 52, constitutes an opening section 60 ready, in which the resonator tube 52 or a tube interior formed therein is open to the flow chamber 32 or to the flow volume 42 via a plurality of tube wall openings 64 provided in a tube wall 62 of the resonator tube 52. The pipe wall openings 64 can for example be arranged in a plurality of rows of openings extending in the direction of the housing longitudinal axis A in a substantially regular opening pattern and thus a substantially uniformly acting connection between the pipe interior and the flow chamber 32 in the circumferential direction of the pipe wall 62 of the resonator pipe 52 manufacture.

Der in einem der ersten Zwischenwand 24 näher gelegenen axialen Endbereich 66 des Öffnungsabschnitts 60 anschließende Längenbereich 56 bildet einen ersten Resonatorhals 68 des ersten Helmholtz-Resonators 48. Der Längenbereich 56 bzw. der durch diesen Längenbereich 56 bereitgestellte erste Resonatorhals 68 durchsetzt eine Öffnung in der ersten Zwischenwand 24 und ist vorzugsweise im Wesentlichen gasdicht an diese angebunden. In einem ersten axialen Endbereich 70 des Resonatorrohrs 52, welcher im dargestellten Beispiel über die erste Zwischenwand 24 sich hinaus erstreckend in die erste Resonatorkammer 44 eingreifend positioniert ist, ist das Resonatorrohr 52 bzw. der erste Resonatorhals 68 zur ersten Resonatorkammer 44 offen und stellt somit in Verbindung mit dieser im Wesentlichen den ersten Helmholtz-Resonator 48 bereit. Neben der für den Längenbereich 56 des Resonatorrohrs 52 bereitgestellten bzw. diesen aufnehmenden Öffnung weist die erste Zwischenwand 24 keine weiteren, eine Verbindung zwischen der ersten Resonatorkammer 24 und dem Strömungsvolumen 42 bzw. der Strömungskammer 32 desselben herstellenden Öffnungen auf.The axial end region 66 of the opening section 60 closer to the first partition wall 24 forms a first resonator neck 68 of the first Helmholtz resonator 48. The length region 56 or the first resonator neck 68 provided by this length region 56 penetrates an opening in the first Intermediate wall 24 and is preferably connected to this in a substantially gas-tight manner. In a first axial end region 70 of the resonator tube 52, which in the example shown extends beyond the first partition wall 24 and is positioned and engages into the first resonator chamber 44, the resonator tube 52 or the first resonator neck 68 is open to the first resonator chamber 44 and is thus in Connection with this essentially the first Helmholtz resonator 48 ready. In addition to the opening provided for or accommodating the length region 56 of the resonator tube 52, the first partition wall 24 has no further openings that establish a connection between the first resonator chamber 24 and the flow volume 42 or the flow chamber 32 of the same.

Der an einen zweiten axialen Endbereich 72 des Öffnungsabschnitts 60 anschließende Längenbereich 58 des Resonatorrohrs 52 durchsetzt eine Öffnung in der zweiten Zwischenwand 26 und ist mit dieser vorzugsweise im Wesentlichen gasdicht verbunden. Der Längenbereich 58 bildet einen zweiten Resonatorhals 74 und ist im Bereich eines zweiten axialen Endbereichs 76 des Resonatorrohrs 52 zur zweiten Resonatorkammer 26 offen. Der zweite Längenbereich 58 erstreckt sich über die zweite Stirnwand 26 hinaus in die zweite Resonatorkammer 46 eingreifend und stellt in Verbindung mit dieser im Wesentlichen den zweiten Helmholtz-Resonator 50 bereit. Auch die zweite Zwischenwand 26 weist neben der vom Resonatorrohr 52 durchsetzten Öffnung keine weiteren Öffnungen auf, die eine Verbindung zwischen der zweiten Resonatorkammer 46 und dem Strömungsvolumen 42 bzw. der Strömungskammer 32 bereitstellen.The length region 58 of the resonator tube 52 adjoining a second axial end region 72 of the opening section 60 penetrates an opening in the second intermediate wall 26 and is preferably connected to it in a substantially gas-tight manner. The length region 58 forms a second resonator neck 74 and is open to the second resonator chamber 26 in the region of a second axial end region 76 of the resonator tube 52. The second length region 58 extends beyond the second end wall 26 and engages in the second resonator chamber 46 and in connection therewith essentially provides the second Helmholtz resonator 50. In addition to the opening through which the resonator tube 52 passes, the second partition 26 also has no further openings which provide a connection between the second resonator chamber 46 and the flow volume 42 or the flow chamber 32.

Über die Rohrwandöffnungen 64 ist eine akustische Anbindung der beiden Helmholtz-Resonatoren 48, 50 bzw. der Resonatorhälse 68, 74 derselben an das Strömungsvolumen 42 bzw. das durch das Strömungsvolumen 42 hindurchströmende und Schall transportierende Abgas realisiert. Obgleich dieses Abgas auch die Volumina der Resonatorkammern 44, 46 und den Rohrinnenraum des Resonatorrohrs 52 füllen wird, nehmen weder die Volumina 44, 46, noch der Rohrinnenraum des Resonatorrohrs 52, mit Ausnahme des von Abgas grundsätzlich durchströmbaren Öffnungsabschnitts 54, an der Abgasströmung teil und sind daher im Sinne der vorliegenden Erfindung auch nicht als Teil des Strömungsvolumens zu betrachten.An acoustic connection of the two Helmholtz resonators 48, 50 or the resonator necks 68, 74 of the same to the flow volume 42 or the exhaust gas flowing through the flow volume 42 and transporting sound is realized via the pipe wall openings 64. Although this exhaust gas will also fill the volumes of the resonator chambers 44, 46 and the pipe interior of the resonator pipe 52, neither the volumes 44, 46 nor the pipe interior of the resonator pipe 52, with the exception of the opening section 54 through which exhaust gas can basically flow, participate in the exhaust gas flow and are therefore also not to be regarded as part of the flow volume in the context of the present invention.

Durch die Auswahl der Volumina der beiden Resonatorkammern 44, 46, welche Volumina im Wesentlichen begrenzt sind durch die die Resonatorkammern 44, 46 axial begrenzenden Stirnwände 20, 22 und Zwischenwände 24, 26 sowie die Umfangswand 14, und von welchen jeweils das vom Einlassrohr 30 bzw. vom Auslassrohr 38 eingenommene Volumen abzuziehen ist, und die entsprechend geeignete Dimensionierung der Resonatorhälse 68, 74 können die Resonanzfrequenzen der beiden Helmholtz-Resonatoren 48, 50 festgelegt bzw. definiert auf besonders kritische Frequenzen abgestimmt werden. Dabei ist zu erkennen, dass bei der besonders einfachen baulichen Ausgestaltung das Resonatorrohr 52 in Richtung der Gehäuselängsachse A mit im Wesentlichen konstanter Querschnittsabmessung, insbesondere also auch konstantem Innendurchmesser, ausgebildet ist, so dass eine Einflussnahme auf die jeweilige Resonanzfrequenz der Helmholtz-Resonatoren im Bereich der Resonatorhälse 68, 74 im Wesentlichen durch die geeignete Auswahl der Länge derselben genommen wird. Dies wiederum kann dadurch erfolgen, dass der Öffnungsabschnitt 54 an geeigneter Positionierung zwischen den beiden axialen Endbereichen 70, 76 des Resonators 52, jedoch innerhalb der axialen Erstreckung der Resonatorkammer 32 angeordnet und auch mit geeigneter Ausdehnung in Richtung der Gehäuselängsachse A bereitgestellt wird. Je länger der Öffnungsabschnitt 54 des Resonatorrohrs 52 ist, desto kürzer ist die noch zur Verfügung stehende Länge der beiden die Resonatorhälse 68, 76 bereitstellenden Längenbereiche 56, 58.By selecting the volumes of the two resonator chambers 44, 46, which volumes are essentially limited by the end walls 20, 22 and intermediate walls 24, 26 axially delimiting the resonator chambers 44, 46 and the peripheral wall 14, and of which the inlet pipe 30 or The volume occupied by the outlet pipe 38 is to be subtracted, and the appropriately suitable dimensioning of the resonator necks 68, 74 allows the resonance frequencies of the two Helmholtz resonators 48, 50 to be fixed or matched to particularly critical frequencies in a defined manner. It can be seen that in the particularly simple structural design, the resonator tube 52 is designed in the direction of the housing longitudinal axis A with an essentially constant cross-sectional dimension, in particular also with a constant inner diameter, so that an influence on the respective resonance frequency of the Helmholtz resonators in the area of Resonator necks 68, 74 are taken essentially by suitable selection of the length thereof. This in turn can take place in that the opening section 54 is positioned appropriately between the two axial end regions 70, 76 of the Resonator 52, however, is arranged within the axial extent of the resonator chamber 32 and is also provided with a suitable extension in the direction of the longitudinal axis A of the housing. The longer the opening section 54 of the resonator tube 52, the shorter the length still available of the two length regions 56, 58 providing the resonator necks 68, 76.

Dadurch, dass bei dem erfindungsgemäßen Aufbau die beiden Resonatorkammern 44, 46 axial jeweils unmittelbar anschließend an das vom Resonatorrohr 52 durchsetzte Strömungsvolumen 42, insbesondere die Strömungskammer 32, angeordnet sind, wird einerseits eine axial kompakte Bauart erreicht und andererseits die Möglichkeit geschaffen, dass das einzige Resonatorrohr 52 die den beiden Helmholtz-Resonatoren 48, 50 zugeordneten Resonatorhälse 68, 74 bereitstellen kann.Because the two resonator chambers 44, 46 are each arranged axially directly adjacent to the flow volume 42 through which the resonator tube 52 passes, in particular the flow chamber 32, in the construction according to the invention, on the one hand, an axially compact design is achieved and, on the other hand, the possibility is created that the only one Resonator tube 52 which can provide the resonator necks 68, 74 assigned to the two Helmholtz resonators 48, 50.

Es ist dabei darauf hinzuweisen, dass dies auch erreicht werden kann, wenn das Strömungsvolumen mehrere Strömungskammern aufweist. Beispielsweise könnte zwischen den beiden Zwischenwänden 24, 26 eine weitere Zwischenwand vorgesehen sein, in welcher beispielsweise durch eine oder mehrere Öffnungen oder/und ein oder mehrere diese durchsetzende Rohre eine Verbindung zwischen diesen Kammern hergestellt ist, so dass das vom Einlass 28 zum Auslass 36 strömende Abgas all diese Kammern durchströmen kann. Der Öffnungsabschnitt 54 könnte dann in einer dieser Kammern angeordnet sein oder könnte in beiden Kammern liegend angeordnet sein oder in zwei Bereiche unterteilt sein, von welchen jeder in einer der dem Strömungsvolumen 42 zuzurechnenden Strömungskammern positioniert ist. Bei der dargestellten besonders bevorzugten Ausgestaltungsart ist jedoch zwischen der ersten Zwischenwand 24 und der zweiten Zwischenwand 26 keine weitere das Strömungsvolumen 42 in mehrere Kammern unterteilende Zwischenwand vorgesehen. Auch könnte beispielsweise der Abgasauslass mehrere, dann beispielsweise jeweilige Endrohre bildende Auslassrohre aufweisen.It should be pointed out that this can also be achieved if the flow volume has several flow chambers. For example, a further partition could be provided between the two partition walls 24, 26, in which a connection is established between these chambers, for example through one or more openings and / or one or more tubes penetrating them, so that the fluid flowing from the inlet 28 to the outlet 36 Exhaust gas can flow through all these chambers. The opening section 54 could then be arranged in one of these chambers or could be arranged lying in both chambers or could be divided into two areas, each of which is positioned in one of the flow chambers assigned to the flow volume 42. In the particularly preferred embodiment shown, however, no further partition dividing the flow volume 42 into several chambers is provided between the first partition 24 and the second partition 26. For example, the exhaust gas outlet could also have a plurality of outlet pipes, then for example forming respective tail pipes.

Claims (16)

  1. Exhaust muffler for an exhaust system of an internal combustion engine, especially in a vehicle, comprising in a muffler housing:
    - a flow volume (42), through which exhaust gas can flow, with an exhaust gas inlet (28) and with an exhaust gas outlet (36),
    - a first resonator chamber (44) open to the flow volume (42) via a first resonator neck (68),
    - a second resonator chamber (46) open to the flow volume (42) via a second resonator neck (74),
    characterized by a resonator pipe (52) providing the first resonator neck (68) and the second resonator neck (74).
  2. Exhaust muffler in accordance with claim 1, characterized in that the muffler housing (12) comprises a circumferential wall (14) elongated in the direction of a housing longitudinal axis (A) and a respective front wall (20, 22) at both axial end areas (16, 18) of the circumferential wall (14) as well as at least two partitions (24, 26) between the front walls (20, 22), wherein the first resonator chamber (44) is separated from the flow volume (42) by a first partition (24) and the second resonator chamber (46) is separated from the flow volume (42) by a second partition (26).
  3. Exhaust muffler in accordance with claim 2, characterized in that the flow volume (42) comprises a flow chamber (32) formed between the first partition (24) and the second partition (26).
  4. Exhaust muffler in accordance with claim 2 or 3, characterized in that the first resonator neck (68) passes through the first partition (24) or/and is open towards the first resonator chamber (44) in the area of the first partition (24), and that the second resonator neck (74) passes through the second partition (26) or/and is open towards the second resonator chamber (46) in the area of the second partition (26).
  5. Exhaust muffler in accordance with claim 4, characterized in that the first partition (24) has no opening providing a connection between the flow volume (42) and the first resonator chamber (44) in addition to the opening provided by the first resonator neck (68), and that the second partition (26) has no opening providing a connection between the flow volume (42) and the second resonator chamber (46) in addition to the opening provided by the second resonator neck (74).
  6. Exhaust muffler in accordance with one of the above claims, characterized in that the resonator pipe (52) has at least one pipe wall opening (64) establishing a connection between the flow volume (42) and a pipe interior of the resonator pipe (52) in a pipe wall (62) of the resonator pipe (52) in its section extending in the flow volume (42).
  7. Exhaust muffler in accordance with claim 6, characterized in that the resonator pipe (52) has an opening section (54) with a plurality of pipe wall openings (64) in its section extending in the flow volume (42).
  8. Exhaust muffler in accordance with claim 7, characterized in that the resonator pipe (52) provides the first resonator neck (68) in a first length area (56) adjoining the opening section (54) at a first axial end area (66) of the opening section (54) and it provides the second resonator neck (74) in a second length area (58) adjoining the opening section (54) at a second axial end area (72) of the opening section (54).
  9. Exhaust muffler in accordance with one of the claims 2-7, characterized in that the first resonator chamber (44) is formed between one of the two front walls (20, 22) and the first partition (24), and that the second resonator chamber (46) is formed between the other of the two front walls (20, 22) and the second partition (26).
  10. Exhaust muffler in accordance with claim 3, in combination with claim 6 and in combination with claim 9, characterized in that the resonator pipe (52) passes through the flow chamber (32) and is open with a first axial end area (70) towards the first resonator chamber (44) or/and is located in the first resonator chamber (44) and is open with a second axial end area (76) towards the second resonator chamber (46) or/and is located in the second resonator chamber (46), and that the resonator pipe (52) has the at least one pipe wall opening (64) in its section extending in the flow chamber (32).
  11. Exhaust muffler in accordance with one of the claims 2-10, characterized in that the exhaust gas inlet (28) comprises an inlet pipe (30), which is open in the area of one of the two front walls (20, 22) and provides an inlet duct (34), and that the exhaust gas outlet (36) comprises an outlet pipe (38), which is open in the area of the other of the two front walls (20, 22) and provides an outlet duct (40).
  12. Exhaust muffler in accordance with claim 11, characterized in that the inlet pipe (30) is passed through one of the two resonator chambers (44, 46), and that the outlet pipe (38) is passed through the other of the two resonator chambers (44, 46).
  13. Exhaust muffler in accordance with claim 12, characterized in that the inlet pipe (30) is open towards the flow volume (42) in the area of the partition (24) separating one of the two resonators chambers (44, 46) from the flow volume (42), and that the outlet pipe (38) is open towards the flow volume (42) in the area of the housing partition (26) separating the other of the two resonator chambers (44, 46) from the flow volume (42).
  14. Exhaust muffler in accordance with claim 3 or one of the claims 4-13, if referred to claim 3, characterized in that the first resonator chamber (44) formed between one of the two front walls (20, 22) and the first partition (24), the flow chamber (32) formed between the first partition (24) and the second partition (26) and the second resonator chamber (46) formed between the second partition (26) and the other of the two front walls (20, 22) are provided following one another in the direction of the housing longitudinal axis (A).
  15. Exhaust muffler in accordance with one of the above claims, characterized in that the first resonator chamber (44) and the second resonator chamber (46) have mutually different resonator chamber volumes, or/and that the first resonator neck (68) and the second resonator neck (74) have mutually different resonator neck lengths.
  16. Exhaust muffler in accordance with one of the above claims, characterized in that the resonator pipe (52) has a constant cross-sectional dimension over its entire length.
EP20164452.3A 2019-05-02 2020-03-20 Exhaust silencer for an exhaust gas system of a combustion engine Active EP3734033B8 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019111270.2A DE102019111270A1 (en) 2019-05-02 2019-05-02 Exhaust silencer for an exhaust system of an internal combustion engine

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Publication Number Publication Date
EP3734033A1 EP3734033A1 (en) 2020-11-04
EP3734033B1 true EP3734033B1 (en) 2021-07-21
EP3734033B8 EP3734033B8 (en) 2021-08-25

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US (1) US11643953B2 (en)
EP (1) EP3734033B8 (en)
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DE (1) DE102019111270A1 (en)

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Also Published As

Publication number Publication date
CN111878192A (en) 2020-11-03
EP3734033B8 (en) 2021-08-25
EP3734033A1 (en) 2020-11-04
CN111878192B (en) 2022-05-31
US20200347761A1 (en) 2020-11-05
US11643953B2 (en) 2023-05-09
DE102019111270A1 (en) 2020-11-05

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