EP1785602B1 - Silencer - Google Patents

Silencer Download PDF

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Publication number
EP1785602B1
EP1785602B1 EP06122631A EP06122631A EP1785602B1 EP 1785602 B1 EP1785602 B1 EP 1785602B1 EP 06122631 A EP06122631 A EP 06122631A EP 06122631 A EP06122631 A EP 06122631A EP 1785602 B1 EP1785602 B1 EP 1785602B1
Authority
EP
European Patent Office
Prior art keywords
branch
resonator
pipe
housing
chamber
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.)
Revoked
Application number
EP06122631A
Other languages
German (de)
French (fr)
Other versions
EP1785602A1 (en
Inventor
Thomas Uhlemann
Rolf Dr. Jebasinski
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
J Eberspaecher GmbH and Co KG
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Application filed by J Eberspaecher GmbH and Co KG filed Critical J Eberspaecher GmbH and Co KG
Publication of EP1785602A1 publication Critical patent/EP1785602A1/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00Silencing apparatus characterised by method of silencing
    • F01N1/02Silencing apparatus characterised by method of silencing by using resonance
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00Silencing apparatus characterised by method of silencing
    • F01N1/02Silencing apparatus characterised by method of silencing by using resonance
    • F01N1/023Helmholtz resonators
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2490/00Structure, disposition or shape of gas-chambers
    • F01N2490/15Plurality of resonance or dead chambers

Definitions

  • the present invention relates to a silencer for an exhaust system of an internal combustion engine, in particular in a motor vehicle, having the features of the preamble of claim 1.
  • the invention also relates to an exhaust system equipped with such a silencer.
  • Silencers are well known in exhaust systems of internal combustion engines and regularly serve to reduce the noise emission of the internal combustion engine.
  • silencers which work with a Helmholtz resonator.
  • a Helmholtz resonator has a resonator chamber, which is coupled via a connecting tube, the so-called resonator neck, with the sound source to be damped.
  • the Helmholtz resonator acts in the manner of a spring-mass oscillator whose "spring” is formed by the volume of the resonator and whose "mass” is determined by the volume of the Resonatorhalses.
  • the spring-mass oscillator or the Helmholtz resonator has a resonant frequency at which the damping effect with respect to airborne sound is particularly pronounced.
  • Silencers that work with a Helmholtz resonator are regularly limited in their damping effect on a relatively narrow frequency range. Furthermore As a rule, the production of such silencers is comparatively complex.
  • a muffler for an exhaust system of an internal combustion engine which contains a plurality of separate resonator chambers in a housing.
  • several branch pipes branch off from an exhaust-carrying pipe in a branch section, which branches open in different resonator chambers.
  • the resonator chambers form with the respective associated branch pipe Helmholtz resonators, which have different resonance frequencies.
  • Such a silencer is based on the general idea of forming a plurality of resonator chambers in a single housing of the silencer and branching off a plurality of branch pipes from a common, exhaust-carrying pipe in a single branching section, which discharge into different resonator chambers.
  • the muffler has a plurality of Helmholtz resonators, which are each formed by a resonator and a branch pipe as a resonator neck, said Helmholtz resonators are designed so that they have different resonance frequencies.
  • the muffler can thus attenuate at least two different frequencies or frequency ranges.
  • the muffler according to the invention is also characterized by a comparatively simple Structure and thus by a relatively inexpensive manufacturability.
  • the present invention is concerned with the problem of specifying for a silencer of the type mentioned or for an exhaust system equipped therewith an improved embodiment, which is characterized in particular by an improved damping effect or by a simplified manufacturability.
  • the invention is based on the general idea to additionally arrange an absorption chamber in the housing, such that it encloses a longitudinal portion of the tube and communicates with it.
  • an absorption chamber in the housing, such that it encloses a longitudinal portion of the tube and communicates with it.
  • high-frequency or higher-frequency noise components can be damped.
  • the overall damping effect of the muffler can be improved.
  • the exhaust-carrying pipe can be passed through the housing and / or through at least one or through all resonator chambers.
  • One or more or all branch pipes can run within the housing or by one or be passed through a plurality of resonator chambers.
  • the individual resonator chambers can be arranged one behind the other in a longitudinal direction of the housing and, in particular, have identical cross sections along this longitudinal direction.
  • the branch section, in which all branch pipes branch off from the exhaust-carrying pipe, can be arranged completely within one of the resonator chambers.
  • Fig. 1 and 2 includes an exhaust system 1, at least one exhaust line 2, in which a silencer 3 is integrated.
  • the exhaust system 1 belongs to an internal combustion engine, not shown, and serves for discharging exhaust gases during operation of the internal combustion engine.
  • the internal combustion engine is arranged together with the exhaust system 1 in a motor vehicle.
  • the muffler 3 has an exhaust pipe leading tube 4, which is connected in the assembled state of the muffler 3 to the tubular exhaust line 2 and is involved in this.
  • the exhaust gases of the internal combustion engine are thus passed through the pipe 4.
  • the tube 4 extends in a straight line.
  • the muffler 3 also has a housing 5.
  • the tube 4 extends through the housing 5 through, so it enters at unspecified axial end faces in the housing 5 and from it.
  • the tube 4 in the housing 5 is arranged so that it is radially spaced along its entire circumference by an unspecified, lying between the end faces of the casing 5.
  • the housing 5 contains at least two resonator chambers; in the embodiment shown, three resonator chambers, namely a first resonator chamber 6, a second resonator chamber 7 and a third resonator chamber 8 are provided by way of example. In principle, more than three resonator chambers can also be accommodated in the housing 5.
  • the individual resonator chambers 6, 7, 8 are separated from each other and are preferably sealed gas-tight against each other.
  • the resonator chambers 6, 7, 8 with respect to a longitudinal direction of the housing 5, which is preferably parallel to the longitudinal direction of the tube 4, axially arranged one behind the other.
  • the second resonator chamber 7 is arranged axially between the first resonator chamber 6 and the third resonator chamber 8.
  • partition walls For the axial separation of adjacent resonator chambers 6, 7, 8 partition walls, namely a first partition wall 9 for separating the first resonator 6 of the second resonator 7 and a second partition 10 for separating the second resonator 7 of the third resonator chamber 8 are provided.
  • the partitions 9, 10 are preferably designed and arranged in the housing 5, that they separate the respectively adjacent resonator chambers 6, 7, 8 gas-tight from each other.
  • the tube 4 is passed through the partitions 9, 10, including the partitions 9, 10 corresponding, unspecified passage openings.
  • the partitions 9, 10 extend parallel to each other and parallel to the axial end faces of the housing 5. In this way, the tube 4 is simultaneously passed through all the resonator chambers 6, 7, 8.
  • the muffler 3 is also equipped with a plurality of branch pipes, here with three branch pipes, namely a first branch pipe 11, a second branch pipe 12 and a third branch pipe 13.
  • branch pipes 11, 12, 13 are provided as resonator chambers 6, 7, 8.
  • Each branch pipe 11, 12, 13 branches off from the pipe 4 in an axially limited branch section 14 of the pipe 4.
  • Each branch pipe 11, 12, 13 is open at its end remote from the branch section 14.
  • each branch pipe 11, 12, 13 opens into another resonator chamber 6, 7, 8.
  • the first branch pipe 11 opens in the first resonator chamber 6.
  • the second branch pipe 12 opens in the second resonator chamber 7 and the third branch pipe 13 opens into the third resonator 8.
  • three Helmholtz resonators are formed, each consisting of exactly one resonator 6, 7, 8 and exactly one branch pipe 11, 12, 13 as Resonatorhals ,
  • the three Helmholtz resonators of the silencer 3 shown are designated according to their components with 6-11, 7-12 and 8-13.
  • the three Helmholtz resonators 6-11, 7-12, 8-13 have different resonance frequencies, so that the silencer 3 can attenuate three different frequencies or frequency ranges in the present case.
  • the branch pipes 11, 12, 13 are disposed completely within the housing 5, preferably circumferentially spaced in the radial direction to the shell of the housing 5.
  • the branch portion 14 is preferably disposed entirely within the housing 5.
  • the branch section 14 is arranged completely within one of the resonator chambers, here in the first resonator chamber 6. Accordingly, the second branch pipe 12 extends through the first resonator chamber 6 to open in the second resonator chamber 7.
  • the third branch pipe 13 extends through the first resonator chamber 6 and through the second resonator chamber 7 to open in the third resonator chamber 8. Accordingly, the second branch pipe 12 is passed through the first partition wall 9, while the third branch pipe 13 is passed through both partition walls 9, 10.
  • the individual branch pipes 11, 12, 13 go in Branch portion 14 substantially radially from the pipe 4 from.
  • the individual branch pipes 11, 12, 13 branch off in the branching section 14 in the circumferential direction of the pipe 4, ie distributed in the circumferential direction, in each case separately from the pipe 4.
  • the first branch pipe 11 has a straight, relative to the tube 4 radial course
  • the second branch pipe 12 and the third branch pipe 13 are angled by about 90 ° ,
  • These two branch pipes 12, 13 thus have an unspecified radial section and an unspecified axial section.
  • the respective radial section extends in a straight line from the branch section 14 with respect to the tube 4 in the radial direction and merges within the first resonator chamber 6 via a 90 ° bend into the axial section which extends parallel to the longitudinal direction of the tube 4.
  • the three Helmholtz resonators 6-11, 7-12, 8-13 have different resonance frequencies, they may differ from one another with respect to the volumes of the resonator chambers 6, 7, 8 and / or the branch pipes 11, 12, 13.
  • the three branch pipes 11, 12, 13 are of different lengths and also provided with different cross sections.
  • the resonator chambers 6, 7, 8 have the same cross-sections with respect to the longitudinal direction of the housing 5. In order nevertheless to achieve different volumes for the resonator chambers 6, 7, 8, they can have different axial extensions in the housing longitudinal direction exhibit.
  • the first resonator chamber 6 in the housing longitudinal direction is longer than the other two resonator chambers 7, 8.
  • the volumes of the second resonator chamber 7 and the third resonator chamber 8 are approximately equal.
  • the muffler 3 also has an absorption chamber 15 which communicates with the pipe 4.
  • the absorption chamber 15 is arranged in the housing 5.
  • a sleeve 16 is provided, which is preferably arranged in the housing 5 so that it encloses the tube 4 axially parallel, preferably concentrically, in a longitudinal section. In this way, the absorption chamber 15 is formed radially between the tube 4 and the sleeve 16.
  • the sleeve 16 is closed at its axial ends with unspecified bottoms, through which the tube 4 is passed.
  • the sleeve 16 is dimensioned and arranged with respect to the tube 4 so that the absorption chamber 15 in the longitudinal section completely envelops the tube 4 in the circumferential direction. Furthermore, the sleeve 16 is preferably dimensioned and arranged in the housing 5 such that it does not touch the jacket of the housing 5.
  • the sleeve 16 and thus the absorption chamber 15 are in the present case in the axial direction, ie in the longitudinal direction of the tube 4 and in the longitudinal direction of the housing 5 dimensioned so that they extend through both partitions 9, 10.
  • the absorption chamber 15 or the sleeve 16 extends through the second resonator chamber 7 and into the first resonator chamber 6 on the one hand and into the third resonator chamber 8 on the other hand.
  • the pipe 4 is designed to be permeable to airborne sound in the longitudinal section enveloped by the absorption chamber 15. This is achieved by way of example by means of a perforation 17, which may be formed by a plurality of individual holes 18, for example.
  • the absorption chamber 15 is sealed gas-tight with respect to the resonator chambers 6, 7, 8. With the help of the absorption chamber 15 high-frequency or higher-frequency noise components can be damped.
  • the absorption chamber 15 may be filled with a suitable absorption material 19.
  • the tube 4, the sleeve 16 and the branch pipes 12, 13 are inserted through the axial end faces of the housing 5 or through the partitions 9, 10 or through the bottoms of the sleeve 16, in particular gas-tight connections possible are.
  • at least partially sliding seats may be provided to compensate for thermally induced expansion effects can. Such sliding seats can be realized sufficiently gas-tight.
  • the individual components of the muffler 3, in particular the tube 4, the sleeve 16, the branch pipes 11, 12, 13, the housing 5 and the partitions 9, 10 are preferably made of metal, in particular steel or stainless steel.

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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 Abgaseinanlage einer Brennkraftmaschine, insbesondere in einem Kraftfahrzeug, mit den Merkmalen des Oberbegriffs des Anspruchs 1. Die Erfindung betrifft außerdem eine mit einem derartigen Schalldämpfer ausgestattete Abgasanlage.The present invention relates to a silencer for an exhaust system of an internal combustion engine, in particular in a motor vehicle, having the features of the preamble of claim 1. The invention also relates to an exhaust system equipped with such a silencer.

Schalldämpfer sind bei Abgasanlagen von Brennkraftmaschinen allgemein bekannt und dienen regelmäßig zur Reduzierung der Schallemission der Brennkraftmaschine. Zur gezielten Bedämpfung bestimmter Frequenzen sind Schalldämpfer bekannt, die mit einem Helmholtz-Resonator arbeiten. Ein derartiger Helmholtz-Resonator weist eine Resonatorkammer auf, die über ein Verbindungsrohr, dem sogenannten Resonatorhals, mit der zu bedämpfenden Schallquelle gekoppelt ist. Der Helmholtz-Resonator wirkt dabei nach Art eines Feder-Masse-Schwingers, dessen "Feder" durch das Volumen der Resonatorkammer gebildet ist und dessen "Masse" durch das Volumen des Resonatorhalses bestimmt ist. Der Feder-Masse-Schwinger bzw. der Helmholtz-Resonator besitzt eine Resonanzfrequenz, bei der die Dämpfungswirkung bezüglich Luftschall besonders deutlich ausgeprägt ist.Silencers are well known in exhaust systems of internal combustion engines and regularly serve to reduce the noise emission of the internal combustion engine. For targeted damping of certain frequencies, silencers are known which work with a Helmholtz resonator. Such a Helmholtz resonator has a resonator chamber, which is coupled via a connecting tube, the so-called resonator neck, with the sound source to be damped. The Helmholtz resonator acts in the manner of a spring-mass oscillator whose "spring" is formed by the volume of the resonator and whose "mass" is determined by the volume of the Resonatorhalses. The spring-mass oscillator or the Helmholtz resonator has a resonant frequency at which the damping effect with respect to airborne sound is particularly pronounced.

Schalldämpfer, die mit einem Helmholtz-Resonator arbeiten, sind bezüglich ihrer Dämpfungswirkung regelmäßig auf einen relativ engen Frequenzbereich eingeschränkt. Des Weiteren gestaltet sich die Herstellung derartiger Schalldämpfer in der Regel vergleichsweise aufwändig.Silencers that work with a Helmholtz resonator are regularly limited in their damping effect on a relatively narrow frequency range. Furthermore As a rule, the production of such silencers is comparatively complex.

Aus der US 3,434,565 ist ein Schalldämpfer für eine Abgasanlage einer Brennkraftmaschine bekannt, der in einem Gehäuse mehrere voneinander getrennte Resonatorkammern enthält. Dabei zweigen von einem abgasführenden Rohr in einem Abzweigabschnitt mehrere Abzweigrohre ab, die in verschiedenen Resonatorkammern münden. Die Resonatorkammern bilden dabei mit dem jeweils zugehörigen Abzweigrohr Helmholtz-Resonatoren, die verschiedene Resonanzfrequenzen besitzen.From the US 3,434,565 a muffler for an exhaust system of an internal combustion engine is known, which contains a plurality of separate resonator chambers in a housing. In this case, several branch pipes branch off from an exhaust-carrying pipe in a branch section, which branches open in different resonator chambers. The resonator chambers form with the respective associated branch pipe Helmholtz resonators, which have different resonance frequencies.

Ein derartiger Schalldämpfer beruht auf dem allgemeinen Gedanken, in einem einzigen Gehäuse des Schalldämpfers mehrere Resonatorkammern auszubilden und von einem gemeinsamen, Abgas führenden Rohr in einem einzigen Abzweigabschnitt mehrere Abzweigrohre abzuzweigen, die in verschiedenen Resonatorkammern münden. Hierdurch besitzt der Schalldämpfer mehrere Helmholtz-Resonatoren, die jeweils durch eine Resonatorkammer und ein Abzweigrohr als Resonatorhals gebildet sind, wobei diese Helmholtz-Resonatoren so ausgelegt sind, dass sie unterschiedliche Resonanzfrequenzen aufweisen. Durch die wenigstens zwei Resonanzfrequenzen kann der Schalldämpfer somit wenigstens zwei verschiedene Frequenzen bzw. Frequenzbereiche bedämpfen. Durch die Abzweigung der Abzweigrohre in einem gemeinsamen Abzweigabschnitt des Abgas führenden Rohres und die Unterbringung aller Resonatorkammern in einem gemeinsamen Gehäuse zeichnet sich der erfindungsgemäße Schalldämpfer außerdem durch einen vergleichsweise einfachen Aufbau und somit durch eine relativ preiswerte Herstellbarkeit aus.Such a silencer is based on the general idea of forming a plurality of resonator chambers in a single housing of the silencer and branching off a plurality of branch pipes from a common, exhaust-carrying pipe in a single branching section, which discharge into different resonator chambers. As a result, the muffler has a plurality of Helmholtz resonators, which are each formed by a resonator and a branch pipe as a resonator neck, said Helmholtz resonators are designed so that they have different resonance frequencies. As a result of the at least two resonance frequencies, the muffler can thus attenuate at least two different frequencies or frequency ranges. By the diversion of the branch pipes in a common branch portion of the exhaust pipe leading and the accommodation of all resonator chambers in a common housing, the muffler according to the invention is also characterized by a comparatively simple Structure and thus by a relatively inexpensive manufacturability.

Die vorliegende Erfindung beschäftigt sich mit dem Problem, für einen Schalldämpfer der eingangs genannten Art bzw. für eine damit ausgestattete Abgasanlage eine verbesserte Ausführungsform anzugeben, die sich insbesondere durch eine verbesserte Dämpfungswirkung bzw. durch eine vereinfachte Herstellbarkeit auszeichnet.The present invention is concerned with the problem of specifying for a silencer of the type mentioned or for an exhaust system equipped therewith an improved embodiment, which is characterized in particular by an improved damping effect or by a simplified manufacturability.

Dieses Problem wird erfindungsgemäß durch die Gegenstände der unabhängigen Ansprüche gelöst. Vorteilhafte Ausführungsformen sind Gegenstand der abhängigen Ansprüche.This problem is solved according to the invention by the subject matters of the independent claims. Advantageous embodiments are the subject of the dependent claims.

Die Erfindung beruht auf dem allgemeinen Gedanken, im Gehäuse zusätzlich eine Absorptionskammer anzuordnen, derart, dass sie einen Längsabschnitt des Rohrs umhüllt und mit diesem kommuniziert. Mit Hilfe der Absorptionskammer können hochfrequente bzw. höherfrequente Geräuschanteile gedämpft werden. Somit lässt sich insgesamt die Dämpfungswirkung des Schalldämpfers verbessern.The invention is based on the general idea to additionally arrange an absorption chamber in the housing, such that it encloses a longitudinal portion of the tube and communicates with it. With the help of the absorption chamber high-frequency or higher-frequency noise components can be damped. Thus, the overall damping effect of the muffler can be improved.

Der kompakte Aufbau des Schalldämpfers kann durch weitere Maßnahmen bzw. Merkmale verbessert werden, die kumulativ oder alternativ realisierbar sind. Beispielsweise kann das Abgas führende Rohr durch das Gehäuse und/oder durch wenigstens eine oder durch sämtliche Resonatorkammern hindurchgeführt sein. Eines oder mehrere oder sämtliche Abzweigrohre können innerhalb des Gehäuses verlaufen bzw. durch eine oder mehrere Resonatorkammern hindurchgeführt sein. Die einzelnen Resonatorkammern können in einer Längsrichtung des Gehäuses hintereinander angeordnet sein und insbesondere entlang dieser Längsrichtung gleiche Querschnitte aufweisen. Der Abzweigabschnitt, in dem sämtliche Abzweigrohre vom Abgas führenden Rohr abzweigen, kann vollständig innerhalb einer der Resonatorkammern angeordnet sein.The compact design of the muffler can be improved by further measures or features that are cumulative or alternatively feasible. For example, the exhaust-carrying pipe can be passed through the housing and / or through at least one or through all resonator chambers. One or more or all branch pipes can run within the housing or by one or be passed through a plurality of resonator chambers. The individual resonator chambers can be arranged one behind the other in a longitudinal direction of the housing and, in particular, have identical cross sections along this longitudinal direction. The branch section, in which all branch pipes branch off from the exhaust-carrying pipe, can be arranged completely within one of the resonator chambers.

Weitere wichtige Merkmale und Vorteile der Erfindung ergeben sich aus den Unteransprüchen, aus den Zeichnungen und aus der zugehörigen Figurenbeschreibung anhand der Zeichnungen.Other important features and advantages of the invention will become apparent from the dependent claims, from the drawings and from the associated figure description with reference to the drawings.

Es versteht sich, dass die vorstehend genannten und die nachstehend noch zu erläuternden Merkmale nicht nur in der jeweils angegebenen Kombination, sondern auch in anderen Kombinationen oder in Alleinstellung verwendbar sind, ohne den Rahmen der vorliegenden Erfindung zu verlassen.It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.

Bevorzugte Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden in der nachfolgenden Beschreibung näher erläutert, wobei sich gleiche Bezugszeichen auf gleiche oder ähnliche oder funktional gleiche Bauteile beziehen.Preferred embodiments of the invention are illustrated in the drawings and will be described in more detail in the following description, wherein like reference numerals refer to the same or similar or functionally identical components.

Es zeigen, jeweils schematisch,

Fig. 1
einen stark vereinfachten, prinzipiellen Längsschnitt durch einen Schalldämpfer,
Fig. 2
einen Querschnitt des Schalldämpfers entsprechend Schnittlinien II in Fig. 1.
Show, in each case schematically,
Fig. 1
a very simplified, fundamental longitudinal section through a silencer,
Fig. 2
a cross section of the muffler according to section lines II in Fig. 1 ,

Entsprechend den Fig. 1 und 2 umfasst eine Abgasanlage 1 zumindest einen Abgasstrang 2, in den ein Schalldämpfer 3 eingebunden ist. Die Abgasanlage 1 gehört zu einer nicht dargestellten Brennkraftmaschine und dient zum Abführen von Abgasen im Betrieb der Brennkraftmaschine. Vorzugsweise ist die Brennkraftmaschine zusammen mit der Abgasanlage 1 in einem Kraftfahrzeug angeordnet.According to the Fig. 1 and 2 includes an exhaust system 1, at least one exhaust line 2, in which a silencer 3 is integrated. The exhaust system 1 belongs to an internal combustion engine, not shown, and serves for discharging exhaust gases during operation of the internal combustion engine. Preferably, the internal combustion engine is arranged together with the exhaust system 1 in a motor vehicle.

Der Schalldämpfer 3 weist ein Abgas führendes Rohr 4 auf, das im montierten Zustand des Schalldämpfers 3 an den rohrförmigen Abgasstrang 2 angeschlossen bzw. in diesen eingebunden ist. Die Abgase der Brennkraftmaschine werden somit durch das Rohr 4 geleitet. Im gezeigten Beispiel erstreckt sich das Rohr 4 geradlinig.The muffler 3 has an exhaust pipe leading tube 4, which is connected in the assembled state of the muffler 3 to the tubular exhaust line 2 and is involved in this. The exhaust gases of the internal combustion engine are thus passed through the pipe 4. In the example shown, the tube 4 extends in a straight line.

Der Schalldämpfer 3 weist außerdem ein Gehäuse 5 auf. Vorzugsweise erstreckt sich das Rohr 4 durch das Gehäuse 5 hindurch, tritt also an nicht näher bezeichneten axialen Stirnseiten in das Gehäuse 5 ein bzw. daraus aus. Im vorliegenden Fall ist das Rohr 4 im Gehäuse 5 so angeordnet, dass es entlang seines gesamten Umfangs von einem nicht näher bezeichneten, zwischen den Stirnseiten liegenden Mantel des Gehäuses 5 radial beabstandet ist. Das Gehäuse 5 enthält zumindest zwei Resonatorkammern; bei der gezeigten Ausführungsform sind beispielhaft drei Resonatorkammern, nämlich eine erste Resonatorkammer 6, eine zweite Resonatorkammer 7 und eine dritte Resonatorkammer 8 vorgesehen. Grundsätzlich können im Gehäuse 5 auch mehr als drei Resonatorkammern untergebracht sein. Die einzelnen Resonatorkammern 6, 7, 8 sind voneinander getrennt und sind vorzugsweise gegeneinander gasdicht abgeschottet. Im gezeigten Ausführungsbeispiel sind die Resonatorkammern 6, 7, 8 bezüglich einer Längsrichtung des Gehäuses 5, die vorzugsweise parallel zur Längsrichtung des Rohrs 4 verläuft, axial hintereinander angeordnet. Hierdurch ist die zweite Resonatorkammer 7 axial zwischen der ersten Resonatorkammer 6 und der dritten Resonatorkammer 8 angeordnet.The muffler 3 also has a housing 5. Preferably, the tube 4 extends through the housing 5 through, so it enters at unspecified axial end faces in the housing 5 and from it. In the present case, the tube 4 in the housing 5 is arranged so that it is radially spaced along its entire circumference by an unspecified, lying between the end faces of the casing 5. The housing 5 contains at least two resonator chambers; in the embodiment shown, three resonator chambers, namely a first resonator chamber 6, a second resonator chamber 7 and a third resonator chamber 8 are provided by way of example. In principle, more than three resonator chambers can also be accommodated in the housing 5. The individual resonator chambers 6, 7, 8 are separated from each other and are preferably sealed gas-tight against each other. In the embodiment shown, the resonator chambers 6, 7, 8 with respect to a longitudinal direction of the housing 5, which is preferably parallel to the longitudinal direction of the tube 4, axially arranged one behind the other. As a result, the second resonator chamber 7 is arranged axially between the first resonator chamber 6 and the third resonator chamber 8.

Zur axialen Trennung benachbarter Resonatorkammern 6, 7, 8 sind im Gehäuse 5 Trennwände, nämlich eine erste Trennwand 9 zur Abtrennung der ersten Resonatorkammer 6 von der zweiten Resonatorkammer 7 sowie eine zweite Trennwand 10 zur Abtrennung der zweiten Resonatorkammer 7 von der dritten Resonatorkammer 8 vorgesehen. Die Trennwände 9, 10 sind vorzugsweise so ausgestaltet und im Gehäuse 5 angeordnet, dass sie die jeweils aneinander angrenzenden Resonatorkammern 6, 7, 8 gasdicht voneinander trennen. Das Rohr 4 ist durch die Trennwände 9, 10 hindurchgeführt, wozu die Trennwände 9, 10 entsprechende, nicht näher bezeichnete Durchgangsöffnungen aufweisen. Im Beispiel erstrecken sich die Trennwände 9, 10 parallel zueinander und parallel zu den axialen Stirnseiten des Gehäuses 5. Auf diese Weise ist das Rohr 4 gleichzeitig durch alle Resonatorkammern 6, 7, 8 hindurchgeführt.For the axial separation of adjacent resonator chambers 6, 7, 8 partition walls, namely a first partition wall 9 for separating the first resonator 6 of the second resonator 7 and a second partition 10 for separating the second resonator 7 of the third resonator chamber 8 are provided. The partitions 9, 10 are preferably designed and arranged in the housing 5, that they separate the respectively adjacent resonator chambers 6, 7, 8 gas-tight from each other. The tube 4 is passed through the partitions 9, 10, including the partitions 9, 10 corresponding, unspecified passage openings. In the example, the partitions 9, 10 extend parallel to each other and parallel to the axial end faces of the housing 5. In this way, the tube 4 is simultaneously passed through all the resonator chambers 6, 7, 8.

Der Schalldämpfer 3 ist außerdem mit mehreren Abzweigrohren, hier mit drei Abzweigrohren, nämlich einem ersten Abzweigrohr 11, einem zweiten Abzweigrohr 12 und einem dritten Abzweigrohr 13 ausgestattet. Vorzugsweise sind gleich viele Abzweigrohre 11, 12, 13 vorgesehen wie Resonatorkammern 6, 7, 8. Jedes Abzweigrohr 11, 12, 13 zweigt vom Rohr 4 in einem axial begrenzten Abzweigabschnitt 14 des Rohrs 4 ab. Jedes Abzweigrohr 11, 12, 13 ist an seinem vom Abzweigabschnitt 14 entfernten Ende offen. Dabei mündet jedes Abzweigrohr 11, 12, 13 in einer anderen Resonatorkammer 6, 7, 8. Im vorliegenden Fall mündet das erste Abzweigrohr 11 in der ersten Resonatorkammer 6. Das zweite Abzweigrohr 12 mündet in der zweiten Resonatorkammer 7 und das dritte Abzweigrohr 13 mündet in der dritten Resonatorkammer 8. Auf diese Weise sind drei Helmholtz-Resonatoren ausgebildet, die jeweils aus genau einer Resonatorkammer 6, 7, 8 und genau einem Abzweigrohr 11, 12, 13 als Resonatorhals bestehen. Die drei Helmholtz-Resonatoren des gezeigten Schalldämpfers 3 werden entsprechend ihrer Komponenten mit 6-11, 7-12 bzw. 8-13 bezeichnet. Die drei Helmholtz-Resonatoren 6-11, 7-12, 8-13 besitzen unterschiedliche Resonanzfrequenzen, so dass der Schalldämpfer 3 im vorliegenden Fall drei verschiedene Frequenzen bzw. Frequenzbereiche bedämpfen kann.The muffler 3 is also equipped with a plurality of branch pipes, here with three branch pipes, namely a first branch pipe 11, a second branch pipe 12 and a third branch pipe 13. Preferably, the same number of branch pipes 11, 12, 13 are provided as resonator chambers 6, 7, 8. Each branch pipe 11, 12, 13 branches off from the pipe 4 in an axially limited branch section 14 of the pipe 4. Each branch pipe 11, 12, 13 is open at its end remote from the branch section 14. In this case, each branch pipe 11, 12, 13 opens into another resonator chamber 6, 7, 8. In the present case, the first branch pipe 11 opens in the first resonator chamber 6. The second branch pipe 12 opens in the second resonator chamber 7 and the third branch pipe 13 opens into the third resonator 8. In this way, three Helmholtz resonators are formed, each consisting of exactly one resonator 6, 7, 8 and exactly one branch pipe 11, 12, 13 as Resonatorhals , The three Helmholtz resonators of the silencer 3 shown are designated according to their components with 6-11, 7-12 and 8-13. The three Helmholtz resonators 6-11, 7-12, 8-13 have different resonance frequencies, so that the silencer 3 can attenuate three different frequencies or frequency ranges in the present case.

Vorzugsweise sind die Abzweigrohre 11, 12, 13 vollständig innerhalb des Gehäuses 5 angeordnet, und zwar vorzugsweise umfangsmäßig in radialer Richtung beabstandet zum Mantel des Gehäuses 5. Auch der Abzweigabschnitt 14 ist vorzugsweise vollständig innerhalb des Gehäuses 5 angeordnet. Im vorliegenden Fall ist der Abzweigabschnitt 14 vollständig innerhalb einer der Resonatorkammern, hier in der ersten Resonatorkammer 6 angeordnet. Dementsprechend erstreckt sich das zweite Abzweigrohr 12 durch die erste Resonatorkammer 6 hindurch, um in der zweiten Resonatorkammer 7 zu münden. Das dritte Abzweigrohr 13 erstreckt sich durch die erste Resonatorkammer 6 und durch die zweite Resonatorkammer 7 hindurch, um in der dritten Resonatorkammer 8 zu münden. Dementsprechend ist das zweite Abzweigrohr 12 durch die erste Trennwand 9 hindurchgeführt, während das dritte Abzweigrohr 13 durch beide Trennwände 9, 10 hindurchgeführt ist. Im vorliegenden Fall gehen die einzelnen Abzweigrohre 11, 12, 13 im Abzweigabschnitt 14 im wesentlichen radial vom Rohr 4 ab. Dabei zweigen die einzelnen Abzweigrohre 11, 12, 13 im Abzweigabschnitt 14 in der Umfangsrichtung des Rohrs 4 voneinander beabstandet, also in Umfangsrichtung verteilt, jeweils separat vom Rohr 4 ab. Hierdurch ergibt sich im Abzweigabschnitt 14 quasi eine sternförmige Anordnung der abgehenden Abzweigrohre 11, 12, 13. Während das erste Abzweigrohr 11 einen geradlinigen, bezüglich des Rohrs 4 radialen Verlauf aufweist, sind das zweite Abzweigrohr 12 und das dritte Abzweigrohr 13 um etwa 90° abgewinkelt. Diese beiden Abzweigrohre 12, 13 besitzen somit einen nicht näher bezeichneten Radialabschnitt und einen nicht näher bezeichneten Axialabschnitt. Der jeweilige Radialabschnitt erstreckt sich vom Abzweigabschnitt 14 bezüglich des Rohrs 4 in radialer Richtung geradlinig und geht innerhalb der ersten Resonatorkammer 6 über einen 90°-Bogen in den Axialabschnitt über, der sich parallel zur Längsrichtung des Rohrs 4 erstreckt.Preferably, the branch pipes 11, 12, 13 are disposed completely within the housing 5, preferably circumferentially spaced in the radial direction to the shell of the housing 5. Also, the branch portion 14 is preferably disposed entirely within the housing 5. In the present case, the branch section 14 is arranged completely within one of the resonator chambers, here in the first resonator chamber 6. Accordingly, the second branch pipe 12 extends through the first resonator chamber 6 to open in the second resonator chamber 7. The third branch pipe 13 extends through the first resonator chamber 6 and through the second resonator chamber 7 to open in the third resonator chamber 8. Accordingly, the second branch pipe 12 is passed through the first partition wall 9, while the third branch pipe 13 is passed through both partition walls 9, 10. In the present case, the individual branch pipes 11, 12, 13 go in Branch portion 14 substantially radially from the pipe 4 from. In this case, the individual branch pipes 11, 12, 13 branch off in the branching section 14 in the circumferential direction of the pipe 4, ie distributed in the circumferential direction, in each case separately from the pipe 4. This results in the branch section 14 quasi a star-shaped arrangement of the outgoing branch pipes 11, 12, 13. While the first branch pipe 11 has a straight, relative to the tube 4 radial course, the second branch pipe 12 and the third branch pipe 13 are angled by about 90 ° , These two branch pipes 12, 13 thus have an unspecified radial section and an unspecified axial section. The respective radial section extends in a straight line from the branch section 14 with respect to the tube 4 in the radial direction and merges within the first resonator chamber 6 via a 90 ° bend into the axial section which extends parallel to the longitudinal direction of the tube 4.

Damit die drei Helmholtz-Resonatoren 6-11, 7-12, 8-13 unterschiedliche Resonanzfrequenzen aufweisen, können sie sich hinsichtlich der Volumina der Resonatorkammern 6, 7, 8 und/oder der Abzweigrohre 11, 12, 13 voneinander unterscheiden. Im Beispiel sind die drei Abzweigrohre 11, 12, 13 unterschiedlich lang und außerdem mit unterschiedlichen Querschnitten versehen. Die Resonatorkammern 6, 7, 8 weisen im Beispiel bezüglich der Längsrichtung des Gehäuses 5 gleiche Querschnitte auf. Um dennoch unterschiedliche Volumina für die Resonatorkammern 6, 7, 8 zu erzielen, können sie in der Gehäuselängsrichtung unterschiedliche axiale Erstreckungen aufweisen. Beispielsweise ist die erste Resonatorkammer 6 in der Gehäuselängsrichtung länger als die anderen beiden Resonatorkammern 7, 8. Im Beispiel sind die Volumina der zweiten Resonatorkammer 7 und der dritten Resonatorkammer 8 etwa gleich groß.So that the three Helmholtz resonators 6-11, 7-12, 8-13 have different resonance frequencies, they may differ from one another with respect to the volumes of the resonator chambers 6, 7, 8 and / or the branch pipes 11, 12, 13. In the example, the three branch pipes 11, 12, 13 are of different lengths and also provided with different cross sections. In the example, the resonator chambers 6, 7, 8 have the same cross-sections with respect to the longitudinal direction of the housing 5. In order nevertheless to achieve different volumes for the resonator chambers 6, 7, 8, they can have different axial extensions in the housing longitudinal direction exhibit. For example, the first resonator chamber 6 in the housing longitudinal direction is longer than the other two resonator chambers 7, 8. In the example, the volumes of the second resonator chamber 7 and the third resonator chamber 8 are approximately equal.

Durch die Unterbringung der Resonatorkammern 6, 7, 8 des Rohrs 4 und der Abzweigrohre 11, 12, 13 in einem gemeinsamen Gehäuse 5 besitzt der Schalldämpfer 3 einen vergleichsweise einfachen Aufbau, der relativ preiswert realisierbar ist. Hierzu trägt der gemeinsame Abzweigabschnitt 14 bei, in dem sämtliche Abzweigrohre 11, 12, 13 vom Rohr 4 abzweigen. Die axiale Abmessung des Abzweigabschnitts 14 entspricht im gezeigten Ausführungsbeispiel dem in der Längsrichtung des Rohrs 4 gemessenen Durchmesser eines der Abzweigrohre, hier des ersten Abzweigrohrs 11. Hierdurch baut der Abzweigabschnitt 14 extrem kurz. Vorzugsweise kann der Abzweigabschnitt 14 ein bezüglich der daran angrenzenden axialen Abschnitte des Rohrs 4 ein separat hergestellter Rohrabschnitt sein, der insbesondere mit den Radialabschnitten der Abzweigrohre 11, 12, 13 oder mit den kompletten Abzweigrohren 11, 12, 13 vormontierbar ist. Hierdurch wird eine vormontierbare Einheit geschaffen, die im Rahmen der Endmontage relativ einfach in das Rohr 4 und in das Gehäuse 5 einbaubar ist.By accommodating the resonator chambers 6, 7, 8 of the pipe 4 and the branch pipes 11, 12, 13 in a common housing 5, the muffler 3 has a comparatively simple structure, which can be realized relatively inexpensively. This contributes to the common branch section 14, in which all branch pipes 11, 12, 13 branch off from the pipe 4. The axial dimension of the branch section 14 corresponds in the embodiment shown to the measured in the longitudinal direction of the tube 4 diameter of the branch pipes, here the first branch pipe 11. As a result, the branch section 14 builds extremely short. The branching section 14 may preferably be a separately produced pipe section with respect to the axial sections of the pipe 4 adjoining it, which pipe section can be preassembled in particular with the radial sections of the branch pipes 11, 12, 13 or with the complete branch pipes 11, 12, 13. As a result, a pre-assembled unit is created, which is relatively easy to install in the pipe 4 and in the housing 5 in the context of final assembly.

Bei der hier gezeigten, besonderen Ausführungsform weist der Schalldämpfer 3 außerdem eine Absorptionskammer 15 auf, die mit dem Rohr 4 kommuniziert. Die Absorptionskammer 15 ist dabei im Gehäuse 5 angeordnet. Zur Ausbildung der Absorptionskammer 15 ist eine Hülse 16 vorgesehen, die im Gehäuse 5 vorzugsweise so angeordnet ist, dass sie das Rohr 4 achsparallel, vorzugsweise konzentrisch, in einem Längsabschnitt umhüllt. Auf diese Weise ist die Absorptionskammer 15 radial zwischen dem Rohr 4 und der Hülse 16 ausgebildet. Die Hülse 16 ist an ihren axialen Enden mit nicht näher bezeichneten Böden verschlossen, durch die das Rohr 4 hindurchgeführt ist. Vorzugsweise ist die Hülse 16 so dimensioniert und bezüglich des Rohrs 4 so angeordnet, dass die Absorptionskammer 15 in besagtem Längsabschnitt das Rohr 4 in Umfangsrichtung vollständig umhüllt. Des Weiteren ist die Hülse 16 vorzugsweise so dimensioniert und im Gehäuse 5 angeordnet, dass sie den Mantel des Gehäuses 5 nicht berührt.In the particular embodiment shown here, the muffler 3 also has an absorption chamber 15 which communicates with the pipe 4. The absorption chamber 15 is arranged in the housing 5. To form the absorption chamber 15, a sleeve 16 is provided, which is preferably arranged in the housing 5 so that it encloses the tube 4 axially parallel, preferably concentrically, in a longitudinal section. In this way, the absorption chamber 15 is formed radially between the tube 4 and the sleeve 16. The sleeve 16 is closed at its axial ends with unspecified bottoms, through which the tube 4 is passed. Preferably, the sleeve 16 is dimensioned and arranged with respect to the tube 4 so that the absorption chamber 15 in the longitudinal section completely envelops the tube 4 in the circumferential direction. Furthermore, the sleeve 16 is preferably dimensioned and arranged in the housing 5 such that it does not touch the jacket of the housing 5.

Die Hülse 16 und somit die Absorptionskammer 15 sind im vorliegenden Fall in axialer Richtung, also in Längsrichtung des Rohrs 4 bzw. in Längsrichtung des Gehäuses 5 so dimensioniert, dass sie sich durch beide Trennwände 9, 10 hindurcherstrecken. Gleichzeitig erstreckt sich die Absorptionskammer 15 bzw. die Hülse 16 durch die zweite Resonatorkammer 7 hindurch und einerseits in die erste Resonatorkammer 6 hinein und andererseits auch in die dritte Resonatorkammer 8 hinein.The sleeve 16 and thus the absorption chamber 15 are in the present case in the axial direction, ie in the longitudinal direction of the tube 4 and in the longitudinal direction of the housing 5 dimensioned so that they extend through both partitions 9, 10. At the same time, the absorption chamber 15 or the sleeve 16 extends through the second resonator chamber 7 and into the first resonator chamber 6 on the one hand and into the third resonator chamber 8 on the other hand.

Damit der im Abgas mitgeführte Luftschall in die Absorptionskammer 15 eintreten kann, ist das Rohr 4 in dem von der Absorptionskammer 15 umhüllten Längsabschnitt für Luftschall durchlässig ausgestaltet. Erreicht wird dies exemplarisch mit Hilfe einer Perforation 17, die beispielsweise durch eine Vielzahl einzelner Löcher 18 gebildet sein kann. Die Absorptionskammer 15 ist gegenüber den Resonatorkammern 6, 7, 8 gasdicht abgedichtet. Mit Hilfe der Absorptionskammer 15 können hochfrequente bzw. höherfrequente Geräuschanteile bedämpft werden. Die Absorptionskammer 15 kann mit einem geeigneten Absorptionsmaterial 19 befüllt sein.In order for the airborne sound entrained in the exhaust gas to enter the absorption chamber 15, the pipe 4 is designed to be permeable to airborne sound in the longitudinal section enveloped by the absorption chamber 15. This is achieved by way of example by means of a perforation 17, which may be formed by a plurality of individual holes 18, for example. The absorption chamber 15 is sealed gas-tight with respect to the resonator chambers 6, 7, 8. With the help of the absorption chamber 15 high-frequency or higher-frequency noise components can be damped. The absorption chamber 15 may be filled with a suitable absorption material 19.

Wie bereits weiter oben erwähnt, sind das Rohr 4, die Hülse 16 und die Abzweigrohre 12, 13 durch die axialen Stirnseiten des Gehäuses 5 bzw. durch die Trennwände 9, 10 bzw. durch die Böden der Hülse 16 hindurchgesteckt, wobei insbesondere gasdichte Anbindungen möglich sind. Ebenso können zumindest teilweise Schiebesitze vorgesehen sein, um thermisch bedingte Ausdehnungseffekte ausgleichen zu können. Derartige Schiebesitze lassen sich hinreichend gasdicht realisieren. Die einzelnen Komponenten des Schalldämpfers 3, insbesondere das Rohr 4, die Hülse 16, die Abzweigrohre 11, 12, 13, das Gehäuse 5 und die Trennwände 9, 10 sind vorzugsweise aus Metall, insbesondere aus Stahl oder Edelstahl, hergestellt.As already mentioned above, the tube 4, the sleeve 16 and the branch pipes 12, 13 are inserted through the axial end faces of the housing 5 or through the partitions 9, 10 or through the bottoms of the sleeve 16, in particular gas-tight connections possible are. Likewise, at least partially sliding seats may be provided to compensate for thermally induced expansion effects can. Such sliding seats can be realized sufficiently gas-tight. The individual components of the muffler 3, in particular the tube 4, the sleeve 16, the branch pipes 11, 12, 13, the housing 5 and the partitions 9, 10 are preferably made of metal, in particular steel or stainless steel.

Claims (9)

  1. A silencer for an exhaust system (1) of a combustion engine, more preferably in a motor vehicle,
    - with a housing (5), in which at least two resonator chambers (6, 7, 8) are separated from one another,
    - with a pipe (4) conducting exhaust gas from which in a branch-off section (14) at least two branch-off pipes (11, 12, 13) which terminate in different resonator chambers (6, 7, 8) branch off,
    - wherein the respective resonator chamber (6, 7, 8) with the corresponding branch-off pipe (11, 12, 13) in each case forms a Helmholtz resonator (6-11, 7-12, 8-13),
    - wherein the at least two Helmholtz resonators (6-11, 7-12, 8-13) have different resonance frequencies,
    characterized in that
    in the housing (5) an absorption chamber (15) is arranged which is communicatingly connected with the pipe (4) and which is embodied in a sleeve (16) which envelopes a longitudinal section of the pipe (4) parallel to the axis.
  2. The silencer according to Claim 1,
    characterized by at least one of the following characteristics:
    - the pipe (4) is passed through the housing (5);
    - the pipe (4) is passed through at least one resonator chamber (6, 7, 8) or through all resonator chambers (6, 7, 8).
  3. The silencer according to Claim 1 or 2,
    characterized by at least one of the following characteristics:
    - at least one of the branch-off pipes (12, 13) is passed through at least one resonator chamber (6, 7) ;
    - at least one of the branch-off pipes (11, 12, 13) or all branch-off pipes (11, 12, 13) are arranged within the housing (5);
    - at least one of the branch-off pipes (11, 12, 13) or all branch-off pipes (11, 12, 13) branch off radially from the pipe (4);
    - at least two or all branch-off pipes (11, 12, 13) differ from one another with regard to their length and/or with regard to their cross section;
    - the branch-off pipes (11, 12, 13) branch off from the pipe (4) in the branch-off section (14) substantially star-like;
    - at least one of the branch-off pipes (12, 13) is passed through at least one separating wall (9, 10) separating two adjacent resonator chambers (6, 7, 8) from each other;
    - at least one of the branch-off pipes (12, 13) comprises a section which extends parallel to the pipe (4).
  4. The silencer according to any one of the Claims 1 to 3,
    characterized by at least one of the following characteristics:
    - with regard to a housing longitudinal direction at least two or all resonator chambers (6, 7, 8) are axially arranged one after the other in the housing (5);
    - at least two of the resonator chambers (6, 7, 8) differ from one another with regard to their volume;
    - all resonator chambers (6, 7, 8) have the same cross section in the housing longitudinal direction;
    - at least two resonator chambers (6, 7, 8) have different axial extensions with regard to the housing longitudinal direction.
  5. The silencer according to any one of the Claims 1 to 4,
    characterized by at least one of the following characteristics:
    - the branch-off section (14) is arranged within the housing (5);
    - the branch-off section (14) is arranged within one of the resonator chambers (6);
    - a longitudinal extension of the branch-off section (14) in the longitudinal direction of the pipe (4) corresponds to the diameter of one of the branch-off pipes (11) measured in the longitudinal direction of the pipe (4).
  6. The silencer according to any one of the Claims 1 to 5,
    characterized in that
    each Helmholtz resonator (6-11, 7-12, 8-13) comprises only one single resonator chamber (6, 7, 8) and only one single branch-off pipe (11, 12, 13).
  7. The silencer according to any one of the Claims 1 to 6,
    characterized in that
    for each resonator chamber (6, 7, 8) exactly one branch-off pipe (11, 12, 13) is provided.
  8. The silencer according to any one of the Claims 1 to 7,
    characterized by at least one of the following characteristics:
    - the absorption chamber (15) completely envelopes a longitudinal section of the pipe (4) in circumferential direction;
    - the absorption chamber (15) and/or the sleeve (16) extend/s in at least one resonator chamber (6, 7, 8) or through at least one resonator chamber (6, 7, 8);
    - the absorption chamber (15) and/or the sleeve (16) are/is sealed gas-tight relative to the resonator chambers (6, 7, 8);
    - the absorption chamber (15) and/or the sleeve (16) extend/s through at least one separating wall (9, 10) separating two adjacent resonator chambers (6, 7, 8) from one another;
    - the pipe (4) comprises a perforation (17) in a region which communicates with the absorption chamber (15);
    - the absorption chamber (15) is filled with an absorption material (19).
  9. An exhaust system for a combustion engine, more preferably in a motor vehicle,
    characterized by at least one silencer (3) according to any one of the Claims 1 to 8.
EP06122631A 2005-11-10 2006-10-20 Silencer Revoked EP1785602B1 (en)

Applications Claiming Priority (1)

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DE102005054002.3A DE102005054002B4 (en) 2005-11-10 2005-11-10 silencer

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EP1785602B1 true EP1785602B1 (en) 2008-10-08

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DE102005054002A1 (en) 2007-05-16
US20070102236A1 (en) 2007-05-10
DE102005054002B4 (en) 2021-08-12
EP1785602A1 (en) 2007-05-16

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