EP2131015A1 - Silencer for an exhaust gas system - Google Patents

Silencer for an exhaust gas system Download PDF

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Publication number
EP2131015A1
EP2131015A1 EP09155257A EP09155257A EP2131015A1 EP 2131015 A1 EP2131015 A1 EP 2131015A1 EP 09155257 A EP09155257 A EP 09155257A EP 09155257 A EP09155257 A EP 09155257A EP 2131015 A1 EP2131015 A1 EP 2131015A1
Authority
EP
European Patent Office
Prior art keywords
volume
neck
housing
side openings
exhaust pipes
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.)
Granted
Application number
EP09155257A
Other languages
German (de)
French (fr)
Other versions
EP2131015B1 (en
Inventor
Thomas Uhlemann
Peter Gorke
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
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by J Eberspaecher GmbH and Co KG filed Critical J Eberspaecher GmbH and Co KG
Publication of EP2131015A1 publication Critical patent/EP2131015A1/en
Application granted granted Critical
Publication of EP2131015B1 publication Critical patent/EP2131015B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F01N1/003Silencing apparatus characterised by method of silencing by using dead chambers communicating with gas flow passages
    • F01N1/006Silencing apparatus characterised by method of silencing by using dead chambers communicating with gas flow passages comprising at least one perforated tube extending from inlet to outlet of the silencer
    • 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
    • F01N13/00Exhaust 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
    • F01N13/011Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more purifying devices arranged in parallel
    • F01N13/017Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more purifying devices arranged in parallel the purifying devices are arranged in a single housing
    • 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
    • F01N13/00Exhaust 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
    • F01N13/04Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more silencers in parallel, e.g. having interconnections for multi-cylinder engines
    • 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
    • F01N2470/00Structure or shape of gas passages, pipes or tubes
    • F01N2470/14Plurality of outlet tubes, e.g. in parallel or with different length
    • 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
    • F01N2470/00Structure or shape of gas passages, pipes or tubes
    • F01N2470/16Plurality of inlet tubes, e.g. discharging into different chambers

Definitions

  • the present invention relates to a silencer for an at least partially twin-flow exhaust system of an internal combustion engine, in particular of a motor vehicle.
  • the invention also relates to an exhaust system equipped with such a silencer.
  • the exhaust gas generated by the internal combustion engine is discharged via two separate floods.
  • a double-flow design can be useful, for example, in V-engines or boxer engines.
  • the two strands of the twin-flow exhaust system can be assigned to common silencer, for example.
  • Such a silencer in this case comprises a housing which encloses an interior space, and two exhaust pipes through which exhaust gas can flow in parallel and which are respectively led through the interior of the housing.
  • a silencer can be designed as a Helmholtz resonator. The interior of the housing then serves as a resonance volume.
  • a T-shaped neck body may be provided, which is communicatively connected via a cross tube to the two exhaust pipes and from which an extending between the exhaust pipes extending tube, which is open to the interior of the housing.
  • a cross tube to the two exhaust pipes and from which an extending between the exhaust pipes extending tube, which is open to the interior of the housing.
  • the present invention is concerned with the problem of providing for a muffler of the type mentioned or for an exhaust system equipped therewith with an improved embodiment, which is characterized in particular by the fact that the muffler is comparatively compact and comparatively inexpensive to produce, at the same time a sufficient Damping effect should be feasible.
  • the invention is based on the general idea to form the neck body by means of two sheet-shaped longitudinal walls, which are spaced apart and abut respectively on both exhaust pipes. Between these longitudinal walls, a neck volume is limited, which is open on the one hand to the resonant volume, ie to the interior of the housing and in the other side side openings of the exhaust pipes open.
  • the neck body receives an extremely easy to implement structure that can be produced inexpensively and also comparatively easy gas-tight connect with the exhaust pipes. For example, only straight welds are required, which are relatively easy to produce with high quality.
  • the neck body between the two exhaust pipes requires little installation space, since the two longitudinal walls are supported directly on the exhaust pipes, so that lying between the two longitudinal walls wall portions of the exhaust pipes form lateral boundaries of the neck volume and thus contribute to the realization of the neck body.
  • the proposed neck body comes with a comparatively small distance between the exhaust pipes to a sufficient neck volume for to realize the desired Helmholtz resonator. Accordingly, the proposed muffler can build comparatively compact.
  • the neck body may also have a sheet-like transverse wall which limits the neck volume on the one hand of the side openings, so that the neck volume only on the other hand, the side openings to the resonance volume is open. Due to this construction, the formed Helmholtz resonator has only a single neck volume, whereby it can be designed specifically for a specific resonance frequency.
  • the neck body is formed by a U-shaped sheet metal part, whose legs form the longitudinal walls and whose two legs connecting base forms the transverse wall.
  • this sheet metal part may be formed in particular from a single piece of sheet metal.
  • Fig. 1 to 8 comprises a muffler 1, which can be used in a not shown here, at least partially twin-flow exhaust system of an internal combustion engine, which may be arranged in particular in a motor vehicle, a housing 2, the interior 3 encloses.
  • the housing 2 consists, for example, of two frontally arranged bottoms 4 and of two half-shells 5, which surround the interior 3 laterally and in which the bottoms 4 are used for longitudinal limitation of the interior 3.
  • Fig. 1 is the observer facing half-shell 5 omitted to allow insight into the interior 3 of the housing 2.
  • the housing 2 has through the two half-shells 5 and through the two floors 4 an extremely simple and inexpensive construction. In principle, however, other designs for the housing 2 are conceivable.
  • a one-piece tubular body can be used instead of the two half-shells 5.
  • the muffler 1 also has exactly two or at least two exhaust pipes 6, which can be flowed through in parallel by the exhaust gas of the internal combustion engine and which are respectively guided through the inner space 3.
  • the exhaust pipes 6 are guided through the two bottoms 4.
  • the bottoms 4 have for this purpose annular collar 7, in which end portions of the exhaust pipes 6 are inserted.
  • Each exhaust pipe 6 has within the housing 2 in the Fig. 4, 5 and 8th recognizable side opening 8. These side openings 8 are expediently arranged on the two exhaust pipes 6 so that they face each other. In particular, they are aligned with each other.
  • the muffler 1 further includes a neck body 9, which serves to connect the two side openings 8 communicating with the interior 3 of the housing 2, in such a way that in this case a Helmholtz resonator is formed.
  • the interior 3 of the housing 2 then serves as resonance volume of the Helmholtz resonator, while the neck body 9 encloses a neck volume 10 which defines the neck of the Helmholtz resonator.
  • the neck body 9 has two sheet-shaped longitudinal walls 11, each at both exhaust pipes 6 abut.
  • the longitudinal walls 11 are spaced from each other and define the aforementioned neck volume 10.
  • the longitudinal walls 11 are arranged so that the side openings 8 open into the neck volume 10 between them.
  • the two longitudinal walls 11 are open to the interior 3, that is to say to the resonant volume of the Helmholtz resonator designated below by 12.
  • the neck body 9 is disposed entirely within the housing 2, in particular spaced from the housing 2 positioned.
  • the neck body 9 also has a sheet-like transverse wall 13, which likewise forms a boundary of the neck volume 10. Accordingly, the neck volume 10 on the one hand of the side openings 8 is limited by the transverse wall 13 and on the other hand, the side openings 8 to the resonance volume 12 open. As a result, the neck volume 10 can be precisely determined, which simplifies the design of the Helmholtz resonator to a specific resonant frequency.
  • the neck body 9 according to the 6 and 7 produce by means of a U-shaped sheet metal part 14, which may be formed in particular from a single piece of sheet metal.
  • Legs 15 of the U-sheet metal part 14 form the longitudinal walls 11, while the two legs 15 interconnecting base 16 of the U-sheet metal part 14 forms the transverse wall 13.
  • the Helmholtz resonator For the design of the Helmholtz resonator, it has proven to be favorable to arrange the two side openings 8 in the region of the transverse wall 13. As a result, virtually the entire neck volume 10 is available for generating a vibrating air mass.
  • the neck body 9 can also be dispensed with the transverse wall 13, so that the neck volume 10 then on both sides of the side openings 8 to the resonance volume 12 is open.
  • the neck body 9 then has two mutually opposite openings, with which it communicates with the resonance volume 12 and with the interior 3.
  • the side openings 8 are located within the neck volume 10.
  • the Helmholtz resonator acts uniformly for both exhaust pipes 6.
  • the two exhaust pipes 6 are guided in a straight line and parallel to each other through the housing 2.
  • the exhaust pipes 6 in the example between the plates 4 each have a constant cross section, which facilitates in particular the attachment of the neck body 9.
  • other designs are conceivable here as well.
  • the longitudinal walls 11 and the possibly existing transverse wall 13 are each "sheet-shaped" configured. This means in the present context, a substantially flat configuration of the walls, that is, the respective wall is dimensioned considerably larger in the longitudinal direction and in the width direction than in the thickness direction. Furthermore, the longitudinal walls 11 are each configured just here. Further, the investment areas in which the longitudinal walls 11 abut the exhaust pipes 6, designed here in a straight line, which is a gas-tight Connection between the longitudinal walls 11 and the exhaust pipes 6 simplified.
  • the neck body 9 may be welded or soldered to the exhaust pipes 6.
  • the bottoms 4 can be welded or soldered to the half-shells 5. Also, the two half-shells 5 can be attached to each other by welds or solder joints.
  • the exhaust pipes 6 may be soldered or welded at their ends to the collar 7 of the bottom 4.
  • the housing 2 may have a cross-section in the shape of a horizontal figure 8, that is, the half-shells 5 are each concave outwards.
  • the stability of the housing 2 can be increased.
  • this also the vibration behavior of the housing 2 can be influenced in the desired manner.
  • this also allows the resonance volume 12 to be defined for the design of the Helmholtz resonator.
  • the side openings 8 are provided with a circular cross-section. Fits to the transverse wall 13 in longitudinal section, such as in Fig. 7 clearly semicircular design. The radii of the side openings 8 and the transverse wall 3 are suitably coordinated with each other.

Abstract

The silencer (1) comprises housing (2) which encloses an interior space, where an exhaust gas flows through two parallel exhaust gas pipes (6) that are guided through the interior space. Each exhaust gas pipe has a lateral opening (8) in the housing, where a neck body (9) interactively connects both the lateral openings of the exhaust gas pipes for forming a Helmholtz resonator with the interior space of the housing.

Description

Die vorliegende Erfindung betrifft einen Schalldämpfer für eine zumindest teilweise zweiflutige Abgasanlage einer Brennkraftmaschine, insbesondere eines Kraftfahrzeugs. Die Erfindung betrifft außerdem eine mit einem derartigen Schalldämpfer ausgestattete Abgasanlage.The present invention relates to a silencer for an at least partially twin-flow exhaust system of an internal combustion engine, in particular of a motor vehicle. The invention also relates to an exhaust system equipped with such a silencer.

Bei zweiflutigen Abgasanlagen wird das von der Brennkraftmaschine erzeugte Abgas über zwei getrennte Fluten abgeführt. Eine derartige zweiflutige Bauweise kann bspw. bei V-Motoren oder Boxermotoren zweckmäßig sein. Den beiden Strängen der zweiflutigen Abgasanlage können gemeinsame Schalldämpfer zugeordnet sein, bspw. um Rohrresonanzen zu bedämpfen. Ein derartiger Schalldämpfer umfasst dabei ein Gehäuse, das einen Innenraum umschließt, sowie zwei parallel von Abgas durchströmbare Abgasrohre, die jeweils durch den Innenraum des Gehäuses hindurchgeführt sind. Grundsätzlich kann ein derartiger Schalldämpfer als Helmholtz-Resonator ausgestaltet sein. Der Innenraum des Gehäuses dient dann als Resonanzvolumen. Zur Anbindung dieses Resonanzvolumens an die Abgasrohre kann bspw. ein T-förmiger Halskörper vorgesehen sein, der über ein Querrohr an die beiden Abgasrohre kommunizierend angeschlossen ist und von dem ein sich zwischen den Abgasrohren erstreckendes Längsrohr abgeht, das zum Innenraum des Gehäuses hin offen ist. Bei einer derartigen Bauweise ist vergleichsweise viel Bauraum zwischen den beiden Abgasrohren erforderlich, um das Längsrohr dieses Halskörpers unterbringen zu können. Ferner ist es häufig problematisch, das Querrohr gasdicht mit den beiden Abgasrohren zu verbinden. Ferner gestaltet sich die Herstellung des T-förmigen Halskörpers vergleichsweise aufwendig und somit teuer.In dual-flow exhaust systems, the exhaust gas generated by the internal combustion engine is discharged via two separate floods. Such a double-flow design can be useful, for example, in V-engines or boxer engines. The two strands of the twin-flow exhaust system can be assigned to common silencer, for example. To dampen pipe resonances. Such a silencer in this case comprises a housing which encloses an interior space, and two exhaust pipes through which exhaust gas can flow in parallel and which are respectively led through the interior of the housing. In principle, such a silencer can be designed as a Helmholtz resonator. The interior of the housing then serves as a resonance volume. To connect this resonance volume to the exhaust pipes, for example, a T-shaped neck body may be provided, which is communicatively connected via a cross tube to the two exhaust pipes and from which an extending between the exhaust pipes extending tube, which is open to the interior of the housing. In such a construction comparatively much space between the two exhaust pipes is required to accommodate the longitudinal tube of this neck body can. Furthermore, it is often problematic to connect the cross tube gas-tight with the two exhaust pipes. Furthermore, the production of the T-shaped neck body designed comparatively expensive and therefore expensive.

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 dadurch auszeichnet, dass der Schalldämpfer vergleichsweise kompakt baut und vergleichsweise preiswert herstellbar ist, wobei gleichzeitig eine hinreichende Dämpfungswirkung realisierbar sein soll.The present invention is concerned with the problem of providing for a muffler of the type mentioned or for an exhaust system equipped therewith with an improved embodiment, which is characterized in particular by the fact that the muffler is comparatively compact and comparatively inexpensive to produce, at the same time a sufficient Damping effect should be feasible.

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, den Halskörper mit Hilfe von zwei blechförmigen Längswänden zu bilden, die voneinander beabstandet sind und jeweils an beiden Abgasrohren anliegen. Zwischen diesen Längswänden ist ein Halsvolumen begrenzt, das einerseits zum Resonanzvolumen, also zum Innenraum des Gehäuses hin offen ist und in das andererseits Seitenöffnungen der Abgasrohre einmünden. Durch diese Bauweise erhält der Halskörper eine extrem einfach realisierbare Struktur, die sich preiswert herstellen lässt und die sich außerdem vergleichsweise einfach gasdicht mit den Abgasrohren verbinden lässt. Beispielsweise sind nur geradlinige Schweißnähte erforderlich, die vergleichsweise einfach mit hoher Qualität herstellbar sind. Desweiteren benötigt der Halskörper zwischen den beiden Abgasrohren nur wenig Einbauraum, da sich die beiden Längswände an den Abgasrohren direkt abstützen, so dass zwischen den beiden Längswänden liegende Wandabschnitte der Abgasrohre seitliche Begrenzungen des Halsvolumens bilden und somit zur Realisierung des Halskörpers beitragen. Somit kommt der vorgeschlagene Halskörper mit einem vergleichsweise kleinen Abstand zwischen den Abgasrohren aus, um ein ausreichendes Halsvolumen für den gewünschten Helmholtz-Resonator zu realisieren. Dementsprechend kann der vorgeschlagene Schalldämpfer vergleichsweise kompakt bauen.The invention is based on the general idea to form the neck body by means of two sheet-shaped longitudinal walls, which are spaced apart and abut respectively on both exhaust pipes. Between these longitudinal walls, a neck volume is limited, which is open on the one hand to the resonant volume, ie to the interior of the housing and in the other side side openings of the exhaust pipes open. By this construction, the neck body receives an extremely easy to implement structure that can be produced inexpensively and also comparatively easy gas-tight connect with the exhaust pipes. For example, only straight welds are required, which are relatively easy to produce with high quality. Furthermore, the neck body between the two exhaust pipes requires little installation space, since the two longitudinal walls are supported directly on the exhaust pipes, so that lying between the two longitudinal walls wall portions of the exhaust pipes form lateral boundaries of the neck volume and thus contribute to the realization of the neck body. Thus, the proposed neck body comes with a comparatively small distance between the exhaust pipes to a sufficient neck volume for to realize the desired Helmholtz resonator. Accordingly, the proposed muffler can build comparatively compact.

Entsprechend einer vorteilhaften Ausführungsform kann der Halskörper außerdem eine blechförmige Querwand aufweisen, die das Halsvolumen einerseits der Seitenöffnungen begrenzt, so dass das Halsvolumen nur andererseits der Seitenöffnungen zum Resonanzvolumen offen ist. Durch diese Bauweise besitzt der gebildete Helmholtz-Resonator nur ein einziges Halsvolumen, wodurch er gezielt auf eine bestimmte Resonanzfrequenz ausgelegt werden kann.According to an advantageous embodiment of the neck body may also have a sheet-like transverse wall which limits the neck volume on the one hand of the side openings, so that the neck volume only on the other hand, the side openings to the resonance volume is open. Due to this construction, the formed Helmholtz resonator has only a single neck volume, whereby it can be designed specifically for a specific resonance frequency.

Besonders vorteilhaft ist eine Weiterbildung, bei welcher der Halskörper durch ein U-förmiges Blechteil gebildet ist, dessen Schenkel die Längswände bilden und dessen die beiden Schenkel miteinander verbindende Basis die Querwand bildet. Dabei kann dieses Blechteil insbesondere aus einem einzigen Blechstück geformt sein. Insgesamt ergibt sich dadurch eine besonders preiswerte Ausführungsform für den Halskörper und somit für den Schalldämpfer.Particularly advantageous is a development in which the neck body is formed by a U-shaped sheet metal part, whose legs form the longitudinal walls and whose two legs connecting base forms the transverse wall. In this case, this sheet metal part may be formed in particular from a single piece of sheet metal. Overall, this results in a particularly inexpensive embodiment of the neck body and thus for the muffler.

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 are explained in more detail in the following description, wherein the same reference numerals refer to the same or similar or functionally identical components.

Es zeigen, jeweils schematisch,

Fig. 1
eine aufgeschnittene Draufsicht auf einen Schalldämpfer,
Fig. 2
eine Frontansicht des Schalldämpfers entsprechend einer Blickrichtung II in Fig. 1,
Fig. 3
eine Seitenansicht des Schalldämpfers entsprechend einer Blickrichtung III in Fig. 1,
Fig. 4
einen Querschnitt des Schalldämpfers entsprechend Schnittlinien IV in Fig. 1,
Fig. 5
einen Längsschnitt des Schalldämpfers entsprechend Schnittlinien V in Fig. 1,
Fig. 6
eine Draufsicht auf einen Halskörper des Schalldämpfers,
Fig. 7
eine Seitenansicht des Halskörpers,
Fig. 8
eine perspektivische Ansicht des Schalldämpfers.
Show, in each case schematically,
Fig. 1
a cutaway top view of a muffler,
Fig. 2
a front view of the muffler according to a line of sight II in Fig. 1 .
Fig. 3
a side view of the muffler according to a line of sight III in Fig. 1 .
Fig. 4
a cross-section of the muffler according to section lines IV in Fig. 1 .
Fig. 5
a longitudinal section of the muffler according to section lines V in Fig. 1 .
Fig. 6
a plan view of a neck body of the muffler,
Fig. 7
a side view of the neck body,
Fig. 8
a perspective view of the muffler.

Entsprechend den Fig. 1 bis 8 umfasst ein Schalldämpfer 1, der bei einer hier nicht näher dargestellten, zumindest teilweise zweiflutigen Abgasanlage einer Brennkraftmaschine, die insbesondere in einem Kraftfahrzeug angeordnet sein kann, zum Einsatz kommen kann, ein Gehäuse 2, das einen Innenraum 3 umschließt. Das Gehäuse 2 besteht bspw. aus zwei stirnseitig angeordneten Böden 4 sowie aus zwei Halbschalen 5, die den Innenraum 3 seitlich umschließen und in welche die Böden 4 zur Längsbegrenzung des Innenraums 3 eingesetzt sind. In Fig. 1 ist die dem Betrachter zugewandte Halbschale 5 weggelassen, um einen Einblick in den Innenraum 3 des Gehäuses 2 zu ermöglichen. Das Gehäuse 2 besitzt durch die beiden Halbschalen 5 und durch die beiden Böden 4 einen extrem einfachen und preiswerten Aufbau. Grundsätzlich sind jedoch auch andere Bauweisen für das Gehäuse 2 denkbar. Beispielsweise kann ein einteiliger Rohrkörper anstelle der beiden Halbschalen 5 verwendet werden.According to the Fig. 1 to 8 comprises a muffler 1, which can be used in a not shown here, at least partially twin-flow exhaust system of an internal combustion engine, which may be arranged in particular in a motor vehicle, a housing 2, the interior 3 encloses. The housing 2 consists, for example, of two frontally arranged bottoms 4 and of two half-shells 5, which surround the interior 3 laterally and in which the bottoms 4 are used for longitudinal limitation of the interior 3. In Fig. 1 is the observer facing half-shell 5 omitted to allow insight into the interior 3 of the housing 2. The housing 2 has through the two half-shells 5 and through the two floors 4 an extremely simple and inexpensive construction. In principle, however, other designs for the housing 2 are conceivable. For example, a one-piece tubular body can be used instead of the two half-shells 5.

Der Schalldämpfer 1 weist außerdem genau zwei oder zumindest zwei Abgasrohre 6 auf, die vom Abgas der Brennkraftmaschine parallel durchströmbar sind und die jeweils durch den Innenraum 3 hindurch geführt sind. Im Einzelnen sind die Abgasrohre 6 durch die beiden Böden 4 hindurch geführt. Die Böden 4 weisen hierzu ringförmige Kragen 7 auf, in welche Endabschnitte der Abgasrohre 6 eingesteckt sind. Jedes Abgasrohr 6 weist innerhalb des Gehäuses 2 eine in den Fig. 4, 5 und 8 erkennbare Seitenöffnung 8 auf. Diese Seitenöffnungen 8 sind an den beiden Abgasrohren 6 zweckmäßig so angeordnet, dass sie einander zugewandt sind. Insbesondere sind sie zueinander fluchtend ausgerichtet.The muffler 1 also has exactly two or at least two exhaust pipes 6, which can be flowed through in parallel by the exhaust gas of the internal combustion engine and which are respectively guided through the inner space 3. In detail, the exhaust pipes 6 are guided through the two bottoms 4. The bottoms 4 have for this purpose annular collar 7, in which end portions of the exhaust pipes 6 are inserted. Each exhaust pipe 6 has within the housing 2 in the Fig. 4, 5 and 8th recognizable side opening 8. These side openings 8 are expediently arranged on the two exhaust pipes 6 so that they face each other. In particular, they are aligned with each other.

Der Schalldämpfer 1 enthält ferner einen Halskörper 9, der dazu dient, die beiden Seitenöffnungen 8 mit dem Innenraum 3 des Gehäuses 2 kommunizierend zu verbinden, und zwar derart, dass dabei ein Helmholtz-Resonator ausgebildet wird. Der Innenraum 3 des Gehäuses 2 dient dann als Resonanzvolumen des Helmholtz-Resonators, während der Halskörper 9 ein Halsvolumen 10 umschließt, das den Hals des Helmholtz-Resonators definiert. Der Halskörper 9 weist zwei blechförmige Längswände 11 auf, die jeweils an beiden Abgasrohren 6 anliegen. Die Längswände 11 sind voneinander beabstandet und begrenzen das zuvor genannte Halsvolumen 10. Dabei sind die Längswände 11 so angeordnet, dass zwischen ihnen die Seitenöffnungen 8 in das Halsvolumen 10 einmünden. Ferner sind die beiden Längswände 11 zum Innenraum 3, also zu dem im Folgenden mit 12 bezeichneten Resonanzvolumen des Helmholtz-Resonators offen.The muffler 1 further includes a neck body 9, which serves to connect the two side openings 8 communicating with the interior 3 of the housing 2, in such a way that in this case a Helmholtz resonator is formed. The interior 3 of the housing 2 then serves as resonance volume of the Helmholtz resonator, while the neck body 9 encloses a neck volume 10 which defines the neck of the Helmholtz resonator. The neck body 9 has two sheet-shaped longitudinal walls 11, each at both exhaust pipes 6 abut. The longitudinal walls 11 are spaced from each other and define the aforementioned neck volume 10. The longitudinal walls 11 are arranged so that the side openings 8 open into the neck volume 10 between them. Furthermore, the two longitudinal walls 11 are open to the interior 3, that is to say to the resonant volume of the Helmholtz resonator designated below by 12.

Im gezeigten Beispiel ist der Halskörper 9 vollständig innerhalb des Gehäuses 2 angeordnet, und zwar insbesondere beabstandet vom Gehäuse 2 positioniert. Der Halskörper 9 weist bei der gezeigten Ausführungsform außerdem eine blechförmige Querwand 13 auf, die ebenfalls eine Begrenzung des Halsvolumens 10 bildet. Dementsprechend ist das Halsvolumen 10 einerseits der Seitenöffnungen 8 durch die Querwand 13 begrenzt und andererseits der Seitenöffnungen 8 zum Resonanzvolumen 12 offen. Hierdurch kann das Halsvolumen 10 genau festgelegt werden, was die Auslegung des Helmholtz-Resonators auf eine bestimmte Resonanzfrequenz vereinfacht.In the example shown, the neck body 9 is disposed entirely within the housing 2, in particular spaced from the housing 2 positioned. In the embodiment shown, the neck body 9 also has a sheet-like transverse wall 13, which likewise forms a boundary of the neck volume 10. Accordingly, the neck volume 10 on the one hand of the side openings 8 is limited by the transverse wall 13 and on the other hand, the side openings 8 to the resonance volume 12 open. As a result, the neck volume 10 can be precisely determined, which simplifies the design of the Helmholtz resonator to a specific resonant frequency.

Zweckmäßig lässt sich der Halskörper 9 entsprechend den Fig. 6 und 7 mit Hilfe eines U-förmigen Blechteils 14 herstellen, das insbesondere aus einem einzigen Blechstück geformt sein kann. Schenkel 15 des U-Blechteils 14 bilden die Längswände 11, während eine die beiden Schenkel 15 miteinander verbindende Basis 16 des U-Blechteils 14 die Querwand 13 bildet.Appropriately, the neck body 9 according to the 6 and 7 produce by means of a U-shaped sheet metal part 14, which may be formed in particular from a single piece of sheet metal. Legs 15 of the U-sheet metal part 14 form the longitudinal walls 11, while the two legs 15 interconnecting base 16 of the U-sheet metal part 14 forms the transverse wall 13.

Für die Auslegung des Helmholtz-Resonators hat es sich als günstig herausgestellt, die beiden Seitenöffnungen 8 im Bereich der Querwand 13 anzuordnen. Hierdurch steht quasi das gesamte Halsvolumen 10 zur Erzeugung einer schwingenden Luftmasse zur Verfügung.For the design of the Helmholtz resonator, it has proven to be favorable to arrange the two side openings 8 in the region of the transverse wall 13. As a result, virtually the entire neck volume 10 is available for generating a vibrating air mass.

Bei einer alternativen Ausführungsform, die hier nicht dargestellt ist, kann auch auf die Querwand 13 verzichtet werden, so dass das Halsvolumen 10 dann beiderseits der Seitenöffnungen 8 zum Resonanzvolumen 12 offen ist. Der Halskörper 9 weist dann zwei einander gegenüberliegende Öffnungen auf, mit denen er mit dem Resonanzvolumen 12 bzw. mit dem Innenraum 3 kommuniziert. Durch die Auswahl unterschiedlicher Abstände zwischen diesen Öffnungen und den Seitenöffnungen 8 ist es insbesondere möglich, den Helmholtz-Resonator für zwei verschiedene Resonanzfrequenzen auszulegen. Dies kann für bestimmte Anwendungen von Vorteil sein.In an alternative embodiment, which is not shown here, can also be dispensed with the transverse wall 13, so that the neck volume 10 then on both sides of the side openings 8 to the resonance volume 12 is open. The neck body 9 then has two mutually opposite openings, with which it communicates with the resonance volume 12 and with the interior 3. By selecting different distances between these openings and the side openings 8, it is in particular possible to design the Helmholtz resonator for two different resonance frequencies. This may be beneficial for certain applications.

Bei der hier gezeigten Ausführungsform liegen sich die Seitenöffnungen 8 innerhalb des Halsvolumens 10 gegenüber. Hierdurch wirkt der Helmholtz-Resonator gleichförmig für beide Abgasrohre 6.In the embodiment shown here, the side openings 8 are located within the neck volume 10. As a result, the Helmholtz resonator acts uniformly for both exhaust pipes 6.

Beim gezeigten Beispiel sind die beiden Abgasrohre 6 geradlinig sowie zueinander parallel durch das Gehäuse 2 hindurchgeführt. Grundsätzlich sind jedoch auch andere Bauformen mit schräg verlaufenden Abgasrohren oder mit gekrümmten Abgasrohren denkbar. Ferner besitzen die Abgasrohre 6 im Beispiel zwischen den Böden 4 jeweils einen konstanten Querschnitt, was insbesondere die Anbringung des Halskörpers 9 erleichtert. Jedoch sind auch hier andere Bauformen denkbar.In the example shown, the two exhaust pipes 6 are guided in a straight line and parallel to each other through the housing 2. In principle, however, other types with obliquely extending exhaust pipes or with curved exhaust pipes are conceivable. Furthermore, the exhaust pipes 6 in the example between the plates 4 each have a constant cross section, which facilitates in particular the attachment of the neck body 9. However, other designs are conceivable here as well.

Die Längswände 11 und die ggf. vorhandene Querwand 13 sind jeweils "blechförmig" ausgestaltet. Dies bedeutet im vorliegenden Zusammenhang eine im Wesentlichen flache Ausgestaltung der Wände, dass heißt, die jeweilige Wand ist in Längsrichtung und in Breitenrichtung jeweils erheblich größer dimensioniert als in Dickenrichtung. Desweiteren sind die Längswände 11 hier jeweils eben ausgestaltet. Ferner sind die Anlagebereiche, in denen die Längswände 11 an den Abgasrohren 6 anliegen, hier geradlinig ausgestaltet, was eine gasdichte Verbindung zwischen den Längswänden 11 und den Abgasrohren 6 vereinfacht. Beispielsweise kann der Halskörper 9 mit den Abgasrohren 6 verschweißt oder verlötet sein. Ebenso können die Böden 4 mit den Halbschalen 5 verschweißt oder verlötet sein. Auch können die beiden Halbschalen 5 aneinander durch Schweißverbindungen oder Lötverbindungen befestigt sein. Auch die Abgasrohre 6 können an ihren Enden mit dem Kragen 7 der Böden 4 verlötet oder verschweißt sein.The longitudinal walls 11 and the possibly existing transverse wall 13 are each "sheet-shaped" configured. This means in the present context, a substantially flat configuration of the walls, that is, the respective wall is dimensioned considerably larger in the longitudinal direction and in the width direction than in the thickness direction. Furthermore, the longitudinal walls 11 are each configured just here. Further, the investment areas in which the longitudinal walls 11 abut the exhaust pipes 6, designed here in a straight line, which is a gas-tight Connection between the longitudinal walls 11 and the exhaust pipes 6 simplified. For example, the neck body 9 may be welded or soldered to the exhaust pipes 6. Likewise, the bottoms 4 can be welded or soldered to the half-shells 5. Also, the two half-shells 5 can be attached to each other by welds or solder joints. The exhaust pipes 6 may be soldered or welded at their ends to the collar 7 of the bottom 4.

Entsprechend den Fig. 2, 4 und 8 kann das Gehäuse 2 gemäß der hier gezeigten Ausführungsform einen Querschnitt in Form einer liegenden Acht aufweisen, dass heißt, die Halbschalen 5 sind jeweils nach außen konkav geformt. Durch diese Einbuchtungen der Halbschalen 5 kann zum einen die Stabilität des Gehäuses 2 erhöht werden. Zum anderen kann dadurch auch das Schwingungsverhalten des Gehäuses 2 in gewünschter Weise beeinflusst werden. Desweiteren lässt sich dadurch auch das Resonanzvolumen 12 zur Auslegung des Helmholtz-Resonators definieren.According to the Fig. 2 . 4 and 8th For example, according to the embodiment shown here, the housing 2 may have a cross-section in the shape of a horizontal figure 8, that is, the half-shells 5 are each concave outwards. By these indentations of the half-shells 5, on the one hand, the stability of the housing 2 can be increased. On the other hand, this also the vibration behavior of the housing 2 can be influenced in the desired manner. Furthermore, this also allows the resonance volume 12 to be defined for the design of the Helmholtz resonator.

Entsprechend der hier gezeigten Ausführungsform sind die Seitenöffnungen 8 mit einem kreisförmigen Querschnitt versehen. Passend dazu ist die Querwand 13 im Längsschnitt, wie zum Beispiel in Fig. 7 ersichtlich halbkreisförmig gestaltet. Die Radien der Seitenöffnungen 8 und der Querwand 3 sind dabei zweckmäßig aufeinander abgestimmt.According to the embodiment shown here, the side openings 8 are provided with a circular cross-section. Fits to the transverse wall 13 in longitudinal section, such as in Fig. 7 clearly semicircular design. The radii of the side openings 8 and the transverse wall 3 are suitably coordinated with each other.

Claims (10)

Schalldämpfer für eine zumindest teilweise zweiflutige Abgasanlage einer Brennkraftmaschine, insbesondere eines Kraftfahrzeugs, - mit einem Gehäuse (2), das einen Innenraum (3) umschließt, - mit zwei parallel von Abgas durchströmbaren Abgasrohren (6), die jeweils durch den Innenraum (3) hindurchgeführt sind und die jeweils innerhalb des Gehäuses (2) eine Seitenöffnung (8) aufweisen, - mit einem Halskörper (9), der die beiden Seitenöffnungen (8) der Abgasrohre (6) zur Ausbildung eines Helmholtz-Resonators mit dem als Resonanzvolumen (12) dienenden Innenraum (3) des Gehäuses (2) kommunizierend verbindet, - wobei der Halskörper (9) zwei blechförmige Längswände (11) aufweist, die jeweils an beiden Abgasrohren (6) anliegen und die ein Halsvolumen (10) begrenzen, in das die Seitenöffnungen (8) der Abgasrohre (6) einmünden und das zum Resonanzvolumen (12) offen ist. Silencer for an at least partially twin-flow exhaust system of an internal combustion engine, in particular of a motor vehicle, - With a housing (2) which encloses an interior space (3), with two exhaust pipes (6) which can be flowed through in parallel by exhaust gas, which pass through the inner space (3) and which each have a side opening (8) inside the housing (2), - With a neck body (9) communicating the two side openings (8) of the exhaust pipes (6) for forming a Helmholtz resonator communicating with the resonant volume (12) serving as interior space (3) of the housing (2) - Wherein the neck body (9) has two sheet-shaped longitudinal walls (11) which abut respectively on two exhaust pipes (6) and which delimit a neck volume (10) into which the side openings (8) of the exhaust pipes (6) open and that to the resonance volume (12) is open. Schalldämpfer nach Anspruch 1,
dadurch gekennzeichnet,
dass der Halskörper (9) eine blechförmige Querwand (13) aufweist, die das Halsvolumen (10) einerseits der Seitenöffnungen (8) begrenzt, so dass insbesondere das Halsvolumen (10) nur andererseits der Seitenöffnungen (8) zum Resonanzvolumen (12) offen ist.
Silencer according to claim 1,
characterized,
in that the neck body (9) has a plate-shaped transverse wall (13) which delimits the neck volume (10) on the one hand of the side openings (8), so that in particular the neck volume (10) is open to the resonance volume (12) only on the other side of the side openings (8) ,
Schalldämpfer nach Anspruch 2,
dadurch gekennzeichnet,
dass der Halskörper (9) durch ein U-förmiges Blechteil (14) gebildet ist, dessen Schenkel (15) die Längswände (11) bilden und dessen Basis (16) die Querwand (13) bildet und die beiden Schenkel (15) miteinander verbindet.
Silencer according to claim 2,
characterized,
in that the neck body (9) is formed by a U-shaped sheet metal part (14) whose legs (15) form the longitudinal walls (11) and whose base (16) forms the transverse wall (13) and connects the two legs (15) to one another ,
Schalldämpfer nach Anspruch 3,
dadurch gekennzeichnet,
dass das Blechteil (14) aus einem einzigen Blechstück geformt ist.
Silencer according to claim 3,
characterized,
that the sheet metal part (14) is formed from a single piece of sheet metal.
Schalldämpfer nach einem der Ansprüche 2 bis 4,
dadurch gekennzeichnet,
dass die beiden Seitenöffnungen (8) im Bereich der Querwand (13) angeordnet sind.
Silencer according to one of claims 2 to 4,
characterized,
that the two side openings (8) are arranged in the region of the transverse wall (13).
Schalldämpfer nach Anspruch 1,
dadurch gekennzeichnet,
dass das Halsvolumen (10) beiderseits der Seitenöffnungen (8) zum Resonanzvolumen (12) offen ist.
Silencer according to claim 1,
characterized,
in that the neck volume (10) is open on both sides of the side openings (8) to the resonance volume (12).
Schalldämpfer nach einem der Ansprüche 1 bis 6,
dadurch gekennzeichnet,
dass sich die Seitenöffnungen (8) im Halsvolumen (10) gegenüber liegen.
Silencer according to one of claims 1 to 6,
characterized,
that the side openings (8) in the neck volume (10) are opposite.
Schalldämpfer nach einem der Ansprüche 1 bis 7,
dadurch gekennzeichnet,
dass die Abgasrohre (6) geradlinig und zueinander parallel durch das Gehäuse (2) hindurchgeführt sind.
Silencer according to one of claims 1 to 7,
characterized,
that the exhaust pipes (6) are guided in a straight line and parallel to one another by the housing (2).
Schalldämpfer nach einem der Ansprüche 1 bis 8,
dadurch gekennzeichnet,
dass das Gehäuse (2) in Schalenbauweise ausgestaltet ist.
Silencer according to one of claims 1 to 8,
characterized,
that the housing (2) is designed in shell construction.
Abgasanlage für eine Brennkraftmaschine, insbesondere eines Kraftfahrzeugs, die in einem zweiflutigen Abschnitt einen Schalldämpfer (1) nach einem der Ansprüche 1 bis 9 aufweist.Exhaust system for an internal combustion engine, in particular of a motor vehicle, which has a muffler (1) according to one of claims 1 to 9 in a double-flow section.
EP09155257.0A 2008-06-06 2009-03-16 Silencer for an exhaust gas system Active EP2131015B1 (en)

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DE102008027290A1 (en) 2009-12-10
US7874401B2 (en) 2011-01-25
US20090301807A1 (en) 2009-12-10

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