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EP1832726B1 - Component of an exhaust system - Google Patents

Component of an exhaust system Download PDF

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Publication number
EP1832726B1
EP1832726B1 EP07102848.4A EP07102848A EP1832726B1 EP 1832726 B1 EP1832726 B1 EP 1832726B1 EP 07102848 A EP07102848 A EP 07102848A EP 1832726 B1 EP1832726 B1 EP 1832726B1
Authority
EP
European Patent Office
Prior art keywords
pipe
holes
longitudinal
housing
tube
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.)
Ceased
Application number
EP07102848.4A
Other languages
German (de)
French (fr)
Other versions
EP1832726A3 (en
EP1832726A2 (en
Inventor
Thomas Werber
Arnulf Spieth
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
Eberspaecher Exhaust Technology 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.)
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Publication date
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Publication of EP1832726A2 publication Critical patent/EP1832726A2/en
Publication of EP1832726A3 publication Critical patent/EP1832726A3/en
Application granted granted Critical
Publication of EP1832726B1 publication Critical patent/EP1832726B1/en
Ceased legal-status Critical Current
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/24—Silencing apparatus characterised by method of silencing by using sound-absorbing materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/003—Silencing apparatus characterised by method of silencing by using dead chambers communicating with gas flow passages
    • F01N1/006—Silencing 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1805—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body
    • F01N13/1811—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body with means permitting relative movement, e.g. compensation of thermal expansion or vibration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/10—Exhaust treating devices having provisions not otherwise provided for for avoiding stress caused by expansions or contractions due to temperature variations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/02—Tubes being perforated
    • F01N2470/04—Tubes being perforated characterised by shape, disposition or dimensions of apertures

Definitions

  • the present invention relates to an exhaust gas-carrying component of an exhaust system for an internal combustion engine, in particular in a motor vehicle.
  • the invention also relates to an exhaust system equipped with such a component.
  • An exhaust system of an internal combustion engine in particular in motor vehicles, comprises a multiplicity of components which have an exhaust-gas-carrying pipe arranged in a housing.
  • an exhaust-gas-carrying pipe located in mufflers pipes which are arranged in a housing of the muffler. It may be necessary to design a wall of the respective tube permeable to airborne sound, for example, to allow airborne sound to enter an absorption space in which a damping of the airborne sound takes place.
  • the respective pipe may be provided with a perforation, as disclosed in US Pat GB602859 . US4184565 and US5892186 ,
  • pre-silencers are provided with a perforated tube which is enveloped by a housing in the circumferential direction to form an annular absorption chamber.
  • Exhaust systems are exposed to high thermal loads during operation, in particular during a warm-up phase of the internal combustion engine equipped therewith.
  • relatively large temperature differences can arise between an inner tube carrying exhaust gas and an outer housing.
  • tube and housing may be made of different materials with different thermal expansion coefficients. This can lead to greatly different thermal longitudinal expansion of the pipe on the one hand and the housing on the other.
  • the present invention is concerned with the problem of providing an improved embodiment for a component as well as for an exhaust system of the aforementioned type, which is characterized in particular by an inexpensive manufacturability.
  • the invention is based on the general idea of providing the tube with increased elastic flexibility by a selective selection or design of the perforation in its longitudinal direction.
  • the flexibility of the tube can be deliberately designed so that thermally induced longitudinal expansion forces between the tube and the housing can be largely absorbed by a perforation provided with the longitudinal section of the tube by elastic deformation. In principle, slight plastic deformations can be tolerated as long as they do not endanger the pipe or the respective component.
  • the perforation is designed so that the thus provided longitudinal portion of the tube acts as a quasi spring. Thermally induced longitudinal expansion can thus be absorbed elastically by the tube.
  • the spring elasticity of the tube achieved with the aid of the perforation makes it possible to firmly connect the tube to the housing at its two end regions. A sliding seat is then no longer required.
  • the housing may, for. B. be assembled from identical half shells.
  • the tube and / or the housing may be symmetrical be so that in particular no mounting direction must be observed for the pipe.
  • the perforation may be formed by slots whose longitudinal direction extends in each case in the circumferential direction of the tube.
  • the elasticity of the tube in its longitudinal direction can be increased significantly.
  • FIG. 1 shows a simplified longitudinal section through a component of an exhaust system.
  • FIG. 1 includes an exhaust system 1 shown here only partially of an internal combustion engine, not shown at least one component 2, which is integrated, for example, in an exhaust line 3 of the exhaust system 1.
  • the exhaust system 1 is used for discharging exhaust gases of the internal combustion engine, which may be arranged for example in a motor vehicle.
  • the component 2 also serves for the exhaust gas routing, that is, the component 2 is traversed by exhaust gases during operation of the internal combustion engine.
  • the component 2 has a tube 4 and a housing 5.
  • the tube 4 has two longitudinal ends, namely a first longitudinal end 6 and a second longitudinal end 7.
  • the longitudinal ends 6, 7 are open in each case in the longitudinal direction of the tube 4.
  • the tube 4 extends in a straight line, so that the longitudinal ends 6, 7 are axially open.
  • the tube 4 is designed here cylindrical, it may have a circular or elliptical cross-section. In principle, an embodiment with a curved tube 4 is conceivable.
  • the pipe 4 is thus from the one (first) longitudinal end 6 to the other (second) longitudinal end 7 in the operation of the internal combustion engine can be flowed through by the exhaust gas.
  • the tube 4 has a longitudinal section 8, which is characterized here by a curly bracket.
  • the tube 4 has a wall 9 which is provided with a perforation 10.
  • end regions, namely a first end region 11 and a second end region 12 of the tube 4 are each provided with a wall 9 'which has no perforation 10.
  • the tube 4 is designed radially permeable in its longitudinal section 8 for airborne sound.
  • the tube 4 is fixedly connected to the housing 5 with the first end portion 11 having the first longitudinal end 6. Similarly, the tube 4 is also connected to its second end portion 12 having the second longitudinal end 7, fixed to the housing 5.
  • the fixed connection between the housing 5 and the end regions 11, 12 of the tube 4 can be realized, for example, by soldered connections or welded connections or crimp connections or in the same manner. This results in an intensive stiffening of the housing 5 in the end regions 11, 12 associated longitudinal sections of the housing fifth
  • the perforation 10 of the longitudinal section 8 of the tube 4 is specifically designed so that said longitudinal section 8 thermally induced longitudinal expansion forces between the tube 4 and the housing 5 can absorb it, that the longitudinal section 8 elastically deformed.
  • the pipe 4 directly exposed to the exhaust gas becomes much hotter than the housing 5, which can also radiate heat into the environment. This results in a temperature difference between the tube 4 and the housing 5, which leads to greatly different longitudinal expansion in the tube 4 on the one hand and in the housing 5 on the other.
  • the choice of material for the tube 4 and the housing 5 can lead to different longitudinal expansions. Typical examples are austenite and ferrite combinations.
  • the tube 4 tends to expand much more in its longitudinal direction than the housing 5.
  • the tube 4 Since the tube 4 is fixed in the case of the component 2 shown here at its end portions 11, 12 on the housing 5, the tube 4 with respect to the housing 5 is not expand to the required extent, whereby corresponding longitudinal expansion forces between the tube 4 and the housing 5 arise.
  • the tube 4 is softer than the housing 5, whereby the longitudinal section 8 can be upset. Due to the specifically designed perforation 10 this compression takes place largely in the elastic deformation region of the longitudinal section 8. The resulting longitudinal expansion forces can thus be absorbed by the longitudinal section 8 is substantially resilient. Due to the elasticity of the longitudinal section 8 or the tube 4 achieved with the aid of the perforation 10, different longitudinal expansions can be cushioned without excessive forces being exerted on the tube 4, on the housing 5 and on the connection points between the tube 4 and the housing 5.
  • the design of the perforation 10 is carried out so that the longitudinal section 8 can still absorb those thermal longitudinal expansion forces between the tube 4 and housing 5 substantially by elastic deformation, the maximum in the normal operation of the exhaust system 1 and the engine equipped therewith expected temperature difference between Tube 4 and housing 5 may occur.
  • the deformations occurring in the longitudinal section 8 are mainly elastic. It is clear that over the life of the component 2 and plastic deformation can occur. By the perforation 10 it is achieved that the deformations occurring in the longitudinal section 8 occur so far in the elastic region that possibly also occurring plastic deformations cause the pipe 4 in the Intended Lifetime of the component 2 no serious damage to the pipe 4.
  • both end portions 11, 12 can be fixed in the same way with the housing 5, a symmetrical construction for the tube 4 and for the housing 5 is possible. As a result, the assembly of the component 2 can be simplified. Furthermore, the manufacture of the tube 4 and the manufacture of the housing 5 can be simplified. In particular, the housing 5 can be assembled, for example, from two identical half-shells.
  • the perforation 10 is formed by a plurality of oblong holes 13.
  • the individual elongated holes 13 in the wall 9 are arranged so that they extend with their longitudinal direction in the circumferential direction of the tube 4.
  • all elongated holes 13 are preferably of the same size.
  • the slots 13 are arranged here in rows of holes 14. These rows of holes 14 each contain a plurality of spaced apart in the circumferential direction of the tube 4 slots 13 and are adjacent to each other in the longitudinal direction of the tube 4.
  • Each row of holes 14 has four to eight elongated holes 13 or, for example, six elongated holes 13.
  • the elongated holes 13 of each row of holes 14 are offset relative to the slots 13 of an adjacent in the longitudinal direction of the tube 4 row of holes 14 in the circumferential direction of the tube 4.
  • an offset 15 between the oblong holes 13 of a row of holes 14 with respect to the oblong holes 13 of adjacent thereto in the tube longitudinal direction hole row 14 is exactly as large as measured in the tube circumferential direction half length 16 of a slot 13 plus a measured in the tube circumferential direction half Distance 17 between two adjacent oblong holes 13 of the same row of holes 14. This results from row of holes 14 to row of holes 14 with respect to the distances 17 symmetrical overlap of each adjacent slots 13.
  • the Offset 15 can be avoided by the longitudinal section 8 in the tube longitudinal direction continuous web.
  • the distance 17 of adjacent elongated holes 13 of the same row of holes 14 measured in the tube circumferential direction is e.g. According to the invention, a measured in the tube longitudinal direction distance 18 between two adjacent rows of holes 14 may be approximately the same size as a measured in the tube longitudinal width 19 of the elongated holes 13.
  • the perforated longitudinal section 8 expediently extends directly from the first end region 11 to the second end region 12.
  • the component 2 is designed as a silencer, in particular as a front silencer.
  • the housing 5 encloses the tube 4 radially spaced between the end regions 11, 12, whereby radially between the tube 4 and the housing 5, an annular space 20th arises.
  • This annular space 20, also called absorption space is preferably filled with a sound-absorbing material 21 or absorption material.
  • airborne sound which propagates in the exhaust gas can enter the annular space 20 transversely to the flow direction through the perforation 10, as a result of which it is more or less damped by the sound absorption material.
  • the tube 4 passes completely through the housing 5, so that the length of the housing 5 measured in the tube longitudinal direction approximately coincides with that of the tube 4.
  • the tube 4 extends only within a portion of the housing 5. It is conceivable, for example, a funnel-shaped configuration of the tube 4.
  • the tube 4 may for example form an inner funnel, which is arranged in a configured as an outer funnel housing portion to realize an air gap insulation. While such inner funnels are conventionally cantilevered or free-standing at one axial end due to the expected thermal length changes, it is possible through the perforated longitudinal section 8 to connect the tube 4 designed as an inner funnel to the housing at its two end regions 11, 12.

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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 eine abgasführende Komponente einer Abgasanlage für eine Brennkraftmaschine, insbesondere in einem Kraftfahrzeug. Die Erfindung betrifft außerdem eine mit einer derartigen Komponente ausgestattete Abgasanlage.The present invention relates to an exhaust gas-carrying component of an exhaust system for an internal combustion engine, in particular in a motor vehicle. The invention also relates to an exhaust system equipped with such a component.

Eine Abgasanlage einer Brennkraftmaschine, insbesondere bei Kraftfahrzeugen, umfasst eine Vielzahl von Komponenten, die ein in einem Gehäuse angeordnetes, abgasführendes Rohr aufweisen. Beispielsweise befinden sich in Schalldämpfern Rohre, die in einem Gehäuse des Schalldämpfers angeordnet sind. Dabei kann es erforderlich sein, eine Wandung des jeweiligen Rohrs für Luftschall durchlässig auszugestalten, beispielsweise um Luftschall so in einen Absorptionsraum eintreten zu lassen, in dem eine Dämpfung des Luftschalls stattfindet. Zu diesem Zweck kann das jeweilige Rohr mit einer Perforation ausgestattet sein, wie offenbart in GB602859 , US4184565 und US5892186 . Insbesondere sind Vorschalldämpfer mit einem perforierten Rohr ausgestattet, das von einem Gehäuse in Umfangsrichtung unter Ausbildung einer ringförmigen Absorptionskammer umhüllt ist.An exhaust system of an internal combustion engine, in particular in motor vehicles, comprises a multiplicity of components which have an exhaust-gas-carrying pipe arranged in a housing. For example, located in mufflers pipes which are arranged in a housing of the muffler. It may be necessary to design a wall of the respective tube permeable to airborne sound, for example, to allow airborne sound to enter an absorption space in which a damping of the airborne sound takes place. For this purpose, the respective pipe may be provided with a perforation, as disclosed in US Pat GB602859 . US4184565 and US5892186 , In particular, pre-silencers are provided with a perforated tube which is enveloped by a housing in the circumferential direction to form an annular absorption chamber.

Abgasanlagen sind im Betrieb, insbesondere während einer Warmlaufphase der damit ausgestatteten Brennkraftmaschine, hohen thermischen Belastungen ausgesetzt. Dabei können zwischen einem innen liegenden, Abgas führenden Rohr und einem außen liegenden Gehäuse relativ große Temperaturdifferenzen entstehen. Zusätzlich oder alternativ können Rohr und Gehäuse aus unterschiedlichen Materialien mit verschiedenen thermischen Ausdehnungskoeffizienten bestehen. Hierdurch kann es zu stark unterschiedlichen thermischen Längsdehnungen des Rohrs einerseits und des Gehäuses andererseits kommen. Damit hierbei keine kritischen, thermisch bedingten Spannungen zwischen dem Rohr und dem Gehäuse entstehen, ist es üblich, das jeweilige Rohr nur in einem seiner Endbereiche am Gehäuse zu befestigen, während es mit seinem anderen Endbereich über einen Schiebesitz in seiner Längsrichtung verschiebbar am Gehäuse gelagert ist. Hierdurch kann sich das Rohr in seiner Längsrichtung relativ zum Gehäuse bewegen, so dass eine thermisch bedingte Verspannung zwischen Rohr und Gehäuse nicht auftritt. Allerdings ist der Fertigungsaufwand zur Bereitstellung eines derartigen Schiebesitzes relativ groß, da insbesondere relativ enge Herstellungstoleranzen einzuhalten sind. Des Weiteren können derartige Schiebesitze eine Quelle für störende Geräusche bilden.Exhaust systems are exposed to high thermal loads during operation, in particular during a warm-up phase of the internal combustion engine equipped therewith. In this case, relatively large temperature differences can arise between an inner tube carrying exhaust gas and an outer housing. Additionally or alternatively, tube and housing may be made of different materials with different thermal expansion coefficients. This can lead to greatly different thermal longitudinal expansion of the pipe on the one hand and the housing on the other. So that in this case no critical, thermally induced stresses between the tube and the housing arise, it is customary to attach the respective tube only in one of its end regions on the housing, while it is mounted with its other end region via a sliding seat in its longitudinal direction displaceable on the housing , As a result, the tube can move in its longitudinal direction relative to the housing, so that a thermally induced tension between the tube and housing does not occur. However, the production cost for providing such a sliding seat is relatively large, since in particular relatively tight manufacturing tolerances must be adhered to. Furthermore, such sliding seats can form a source of disturbing noises.

Die vorliegende Erfindung beschäftigt sich mit dem Problem, für eine Komponente sowie für eine Abgasanlage der eingangs genannten Art eine verbesserte Ausführungsform anzugeben, die sich insbesondere durch eine preiswerte Herstellbarkeit auszeichnet.The present invention is concerned with the problem of providing an improved embodiment for a component as well as for an exhaust system of the aforementioned type, which is characterized in particular by an inexpensive 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, das Rohr durch eine gezielte Auswahl bzw. Auslegung der Perforation in seiner Längsrichtung mit einer erhöhten elastischen Flexibilität zu versehen. Durch eine geeignete Dimensionierung der Perforation kann die Flexibilität des Rohrs gezielt so ausgelegt werden, dass thermisch bedingte Längsdehnungskräfte zwischen dem Rohr und dem Gehäuse von einem mit der Perforation versehenen Längsabschnitt des Rohrs weitgehend durch elastische Verformung aufgenommen werden können. Grundsätzlich können geringfügige plastische Verformungen toleriert werden, solange diese das Rohr bzw. die jeweilige Komponente nicht gefährden. Die Perforation ist dabei so ausgestaltet, dass der damit versehene Längsabschnitt des Rohrs quasi als Feder wirkt. Thermisch bedingte Längsdehnungen können somit vom Rohr federelastisch aufgenommen werden. Durch die mit Hilfe der Perforation erreichte Federelastizität des Rohrs ist es möglich, das Rohr an seinen beiden Endbereichen fest mit dem Gehäuse zu verbinden. Ein Schiebesitz ist dann nicht mehr erforderlich. Hierdurch wird die Montage der mit dem perforierten Rohr und dem Gehäuse ausgestatteten Komponente bzw. der Abgasanlage deutlich vereinfacht. Insbesondere lassen sich mehr Gleichteile verwenden. Das Gehäuse kann z. B. aus identischen Halbschalen zusammengebaut sein. Das Rohr und/oder das Gehäuse können symmetrisch gestaltet sein, so dass für das Rohr insbesondere keine Montagerichtung beachtet werden muss.The invention is based on the general idea of providing the tube with increased elastic flexibility by a selective selection or design of the perforation in its longitudinal direction. By suitable dimensioning of the perforation, the flexibility of the tube can be deliberately designed so that thermally induced longitudinal expansion forces between the tube and the housing can be largely absorbed by a perforation provided with the longitudinal section of the tube by elastic deformation. In principle, slight plastic deformations can be tolerated as long as they do not endanger the pipe or the respective component. The perforation is designed so that the thus provided longitudinal portion of the tube acts as a quasi spring. Thermally induced longitudinal expansion can thus be absorbed elastically by the tube. The spring elasticity of the tube achieved with the aid of the perforation makes it possible to firmly connect the tube to the housing at its two end regions. A sliding seat is then no longer required. As a result, the assembly of the perforated tube and the housing equipped component or the exhaust system is significantly simplified. In particular, more equal parts can be used. The housing may, for. B. be assembled from identical half shells. The tube and / or the housing may be symmetrical be so that in particular no mounting direction must be observed for the pipe.

Darüber hinaus ergibt sich durch die beiden fest mit dem Gehäuse verbundenen Endbereiche eine signifikante Aussteifung des Gehäuses, wodurch die Komponente in diesem Bereich eine erhöhte Stabilität aufweist.In addition, results from the two firmly connected to the housing end portions a significant stiffening of the housing, whereby the component has an increased stability in this area.

Außerdem ist die Tendenz einer Geräuschentwicklung, wie sie beispielsweise im Bereich eines Schiebesitzes aufgrund von Relativbewegungen entstehen kann, reduziert.In addition, the tendency of a noise, such as may occur in the region of a sliding seat due to relative movements, reduced.

Entsprechend einer vorteilhaften Ausführungsform kann die Perforation durch Langlöcher gebildet sein, deren Längsrichtung sich jeweils in der Umfangsrichtung des Rohrs erstreckt. Bei dieser Bauweise lässt sich die Elastizität des Rohrs in dessen Längsrichtung besonders deutlich vergrößern.According to an advantageous embodiment, the perforation may be formed by slots whose longitudinal direction extends in each case in the circumferential direction of the tube. In this construction, the elasticity of the tube in its longitudinal direction can be increased significantly.

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

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.

Ein bevorzugtes Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird in der nachfolgenden Beschreibung näher erläutert.A preferred embodiment of the invention is illustrated in the drawing and will be explained in more detail in the following description.

Die einzige Figur 1 zeigt einen vereinfachten Längsschnitt durch eine Komponenten einer Abgasanlage.The only FIG. 1 shows a simplified longitudinal section through a component of an exhaust system.

Entsprechend Fig. 1 umfasst eine hier nur zum Teil dargestellte Abgasanlage 1 einer nicht gezeigten Brennkraftmaschine zumindest eine Komponente 2, die zum Beispiel in einen Abgasstrang 3 der Abgasanlage 1 eingebunden ist. Die Abgasanlage 1 dient zum Abführen von Abgasen der Brennkraftmaschine, die zum Beispiel in einem Kraftfahrzeug angeordnet sein kann. Dementsprechend dient auch die Komponente 2 zur Abgasführung, das heißt die Komponente 2 ist im Betrieb der Brennkraftmaschine von Abgasen durchströmt.Corresponding Fig. 1 includes an exhaust system 1 shown here only partially of an internal combustion engine, not shown at least one component 2, which is integrated, for example, in an exhaust line 3 of the exhaust system 1. The exhaust system 1 is used for discharging exhaust gases of the internal combustion engine, which may be arranged for example in a motor vehicle. Accordingly, the component 2 also serves for the exhaust gas routing, that is, the component 2 is traversed by exhaust gases during operation of the internal combustion engine.

Die Komponente 2 weist ein Rohr 4 sowie ein Gehäuse 5 auf. Das Rohr 4 weist zwei Längsenden, nämlich ein erstes Längsende 6 und ein zweites Längsende 7 auf. Die Längsenden 6, 7 sind dabei jeweils in der Längsrichtung des Rohrs 4 offen. Im vorliegenden Fall erstreckt sich das Rohr 4 geradlinig, so dass die Längsenden 6, 7 axial offen sind. Des Weiteren ist das Rohr 4 hier zylindrisch ausgestaltet, wobei es einen kreisförmigen oder elliptischen Querschnitt aufweisen kann. Grundsätzlich ist auch eine Ausführungsform mit gekrümmtem Rohr 4 denkbar.The component 2 has a tube 4 and a housing 5. The tube 4 has two longitudinal ends, namely a first longitudinal end 6 and a second longitudinal end 7. The longitudinal ends 6, 7 are open in each case in the longitudinal direction of the tube 4. In the present case, the tube 4 extends in a straight line, so that the longitudinal ends 6, 7 are axially open. Furthermore, the tube 4 is designed here cylindrical, it may have a circular or elliptical cross-section. In principle, an embodiment with a curved tube 4 is conceivable.

Das Rohr 4 ist somit von dem einen (ersten) Längsende 6 zum anderen (zweiten) Längsende 7 im Betrieb der Brennkraftmaschine vom Abgas durchströmbar. Zwischen seinen Längsenden 6, 7 weist das Rohr 4 einen Längsabschnitt 8 auf, der hier durch eine geschweifte Klammer gekennzeichnet ist. In diesem Längsabschnitt 8 besitzt das Rohr 4 eine Wandung 9, die mit einer Perforation 10 versehen ist. Im Unterschied dazu sind Endbereiche, nämlich ein erster Endbereich 11 und ein zweiter Endbereich 12 des Rohrs 4 jeweils mit einer Wandung 9' versehen, die keine Perforation 10 besitzt.The pipe 4 is thus from the one (first) longitudinal end 6 to the other (second) longitudinal end 7 in the operation of the internal combustion engine can be flowed through by the exhaust gas. Between its longitudinal ends 6, 7, the tube 4 has a longitudinal section 8, which is characterized here by a curly bracket. In this longitudinal section 8, the tube 4 has a wall 9 which is provided with a perforation 10. In contrast, end regions, namely a first end region 11 and a second end region 12 of the tube 4 are each provided with a wall 9 'which has no perforation 10.

Durch die Perforation 10 ist das Rohr 4 in seinem Längsabschnitt 8 für Luftschall radial durchlässig ausgestaltet.Through the perforation 10, the tube 4 is designed radially permeable in its longitudinal section 8 for airborne sound.

Das Rohr 4 ist mit dem ersten Endbereich 11, der das erste Längsende 6 aufweist, fest mit dem Gehäuse 5 verbunden. Ebenso ist das Rohr 4 auch mit seinem zweiten Endbereich 12, der das zweite Längsende 7 aufweist, fest mit dem Gehäuse 5 verbunden. Die feste Verbindung zwischen dem Gehäuse 5 und den Endbereichen 11, 12 des Rohrs 4 kann beispielsweise durch Lötverbindungen oder Schweißverbindungen oder Bördelverbindungen oder auf gleich wirkende Weise realisiert werden. Hierdurch ergibt sich eine intensive Aussteifung des Gehäuses 5 in den Endbereichen 11, 12 zugeordneten Längsabschnitten des Gehäuses 5.The tube 4 is fixedly connected to the housing 5 with the first end portion 11 having the first longitudinal end 6. Similarly, the tube 4 is also connected to its second end portion 12 having the second longitudinal end 7, fixed to the housing 5. The fixed connection between the housing 5 and the end regions 11, 12 of the tube 4 can be realized, for example, by soldered connections or welded connections or crimp connections or in the same manner. This results in an intensive stiffening of the housing 5 in the end regions 11, 12 associated longitudinal sections of the housing fifth

Die Perforation 10 des Längsabschnitts 8 des Rohrs 4 ist gezielt so ausgestaltet, dass besagter Längsabschnitt 8 thermisch bedingte Längsdehnungskräfte zwischen Rohr 4 und Gehäuse 5 dadurch aufnehmen kann, dass sich der Längsabschnitt 8 elastisch verformt. Beispielsweise wird im Betrieb der Abgasanlage 1 das dem Abgas direkt ausgesetzte Rohr 4 sehr viel heißer als das Gehäuse 5, das außerdem Wärme in die Umgebung abstrahlen kann. Hierdurch kommt es zu einer Temperaturdifferenz zwischen Rohr 4 und Gehäuse 5, die zu stark unterschiedlichen Längsdehnungen im Rohr 4 einerseits und im Gehäuse 5 andererseits führt. Zusätzlich oder alternativ kann auch die Werkstoffauswahl für das Rohr 4 und das Gehäuse 5 zu unterschiedlichen Längsdehnungen führen. Typisch sind z.B. Austenit und Ferrit Kombinationen. Das Rohr 4 tendiert dazu, sich deutlich stärker in seiner Längsrichtung auszudehnen als das Gehäuse 5. Da das Rohr 4 bei der hier gezeigten Komponente 2 an seinen Endbereichen 11, 12 am Gehäuse 5 festgelegt ist, kann sich das Rohr 4 gegenüber dem Gehäuse 5 nicht im erforderlichen Maße ausdehnen, wodurch entsprechende Längsdehnungskräfte zwischen dem Rohr 4 und dem Gehäuse 5 entstehen. Durch die Perforation 10 ist das Rohr 4 weicher als das Gehäuse 5, wodurch der Längsabschnitt 8 gestaucht werden kann. Aufgrund der gezielt so ausgelegten Perforation 10 erfolgt diese Stauchung weitgehend im elastischen Verformungsbereich des Längsabschnitts 8. Die entstehenden Längsdehnungskräfte können somit vom Längsabschnitt 8 im wesentlichen federelastisch aufgenommen werden. Durch die mit Hilfe der Perforation 10 erzielte Federelastizität des Längsabschnitts 8 bzw. des Rohrs 4 können unterschiedliche Längsdehnungen abgefedert werden, ohne dass hierbei zu große Kräfte auf das Rohr 4, auf das Gehäuse 5 und auf die Anbindungsstellen zwischen Rohr 4 und Gehäuse 5 wirken. Vorzugsweise erfolgt die Auslegung der Perforation 10 so, dass der Längsabschnitt 8 diejenigen thermischen Längsdehnungskräfte zwischen Rohr 4 und Gehäuse 5 noch im wesentlichen durch elastische Verformung aufnehmen kann, die bei der im normalen Betrieb der Abgasanlage 1 bzw. der damit ausgestatteten Brennkraftmaschine maximal erwarteten Temperaturdifferenz zwischen Rohr 4 und Gehäuse 5 auftreten können.The perforation 10 of the longitudinal section 8 of the tube 4 is specifically designed so that said longitudinal section 8 thermally induced longitudinal expansion forces between the tube 4 and the housing 5 can absorb it, that the longitudinal section 8 elastically deformed. For example, during operation of the exhaust system 1, the pipe 4 directly exposed to the exhaust gas becomes much hotter than the housing 5, which can also radiate heat into the environment. This results in a temperature difference between the tube 4 and the housing 5, which leads to greatly different longitudinal expansion in the tube 4 on the one hand and in the housing 5 on the other. Additionally or alternatively, the choice of material for the tube 4 and the housing 5 can lead to different longitudinal expansions. Typical examples are austenite and ferrite combinations. The tube 4 tends to expand much more in its longitudinal direction than the housing 5. Since the tube 4 is fixed in the case of the component 2 shown here at its end portions 11, 12 on the housing 5, the tube 4 with respect to the housing 5 is not expand to the required extent, whereby corresponding longitudinal expansion forces between the tube 4 and the housing 5 arise. Through the perforation 10, the tube 4 is softer than the housing 5, whereby the longitudinal section 8 can be upset. Due to the specifically designed perforation 10 this compression takes place largely in the elastic deformation region of the longitudinal section 8. The resulting longitudinal expansion forces can thus be absorbed by the longitudinal section 8 is substantially resilient. Due to the elasticity of the longitudinal section 8 or the tube 4 achieved with the aid of the perforation 10, different longitudinal expansions can be cushioned without excessive forces being exerted on the tube 4, on the housing 5 and on the connection points between the tube 4 and the housing 5. Preferably, the design of the perforation 10 is carried out so that the longitudinal section 8 can still absorb those thermal longitudinal expansion forces between the tube 4 and housing 5 substantially by elastic deformation, the maximum in the normal operation of the exhaust system 1 and the engine equipped therewith expected temperature difference between Tube 4 and housing 5 may occur.

Die auftretenden Verformungen im Längsabschnitt 8 sind dabei hauptsächlich elastisch. Es ist klar, dass über die Lebensdauer der Komponente 2 auch plastische Verformungen auftreten können. Durch die Perforation 10 wird erreicht, dass die im Längsabschnitt 8 auftretenden Verformungen soweit im elastischen Bereich auftreten, dass gegebenenfalls auch auftretende plastische Verformungen das Rohr 4 in der Vorgesehen Lebensdauer der Komponente 2 keine ernsthafte Beschädigung des Rohrs 4 bewirken.The deformations occurring in the longitudinal section 8 are mainly elastic. It is clear that over the life of the component 2 and plastic deformation can occur. By the perforation 10 it is achieved that the deformations occurring in the longitudinal section 8 occur so far in the elastic region that possibly also occurring plastic deformations cause the pipe 4 in the Intended Lifetime of the component 2 no serious damage to the pipe 4.

Da beide Endbereiche 11, 12 in gleicher Weise mit dem Gehäuse 5 befestigt werden können, ist eine symmetrische Bauweise für das Rohr 4 und für das Gehäuse 5 möglich. Hierdurch lässt sich die Montage der Komponente 2 vereinfachen. Des Weiteren lässt sich die Herstellung des Rohrs 4 sowie die Herstellung des Gehäuses 5 vereinfachen. Insbesondere lässt sich das Gehäuse 5 z.B. aus zwei identischen Halbschalen zusammenbauen.Since both end portions 11, 12 can be fixed in the same way with the housing 5, a symmetrical construction for the tube 4 and for the housing 5 is possible. As a result, the assembly of the component 2 can be simplified. Furthermore, the manufacture of the tube 4 and the manufacture of the housing 5 can be simplified. In particular, the housing 5 can be assembled, for example, from two identical half-shells.

Bei der hier gezeigten, bevorzugten Ausführungsform ist die Perforation 10 durch eine Vielzahl von Langlöchern 13 gebildet. Dabei sind die einzelnen Langlöcher 13 in der Wandung 9 so angeordnet, dass sie sich mit ihrer Längsrichtung jeweils in der Umfangsrichtung des Rohrs 4 erstrecken. Des Weiteren sind sämtliche Langlöcher 13 vorzugsweise gleich groß ausgebildet. Dabei sind die Langlöcher 13 hier in Lochreihen 14 angeordnet. Diese Lochreihen 14 enthalten jeweils mehrere, in Umfangsrichtung des Rohrs 4 voneinander beabstandete Langlöcher 13 und sind zueinander in der Längsrichtung des Rohrs 4 benachbart. Dabei weißt jede Lochreihe 14 vier bis acht Langlöcher 13 oder beispielsweise sechs Langlöcher 13 auf. Zur Erzielung der gewünschten Federelastizität des Rohrs 4 in der Rohrlängsrichtung sind die Langlöcher 13 einer jeden Lochreihe 14 gegenüber den Langlöchern 13 einer in der Längsrichtung des Rohrs 4 benachbarten Lochreihe 14 in der Umfangsrichtung des Rohrs 4 versetzt angeordnet. Bei der hier gezeigten, bevorzugten Ausführungsform ist ein Versatz 15 zwischen den Langlöchern 13 der einen Lochreihe 14 gegenüber den Langlöchern 13 der dazu in Rohrlängsrichtung benachbarten Lochreihe 14 genau so groß wie eine in Rohrumfangsrichtung gemessene halbe Länge 16 eines Langlochs 13 zuzüglich einen in Rohrumfangsrichtung gemessenen halben Abstand 17 zwischen zwei benachbarten Langlöchern 13 derselben Lochreihe 14. Hierdurch ergibt sich von Lochreihe 14 zu Lochreihe 14 eine bezüglich der Abstände 17 symmetrische Überlappung der jeweils benachbarten Langlöcher 13. Durch den Versatz 15 kann ein durch den Längsabschnitt 8 in Rohrlängsrichtung durchgehender Steg vermieden werden.In the preferred embodiment shown here, the perforation 10 is formed by a plurality of oblong holes 13. The individual elongated holes 13 in the wall 9 are arranged so that they extend with their longitudinal direction in the circumferential direction of the tube 4. Furthermore, all elongated holes 13 are preferably of the same size. Here, the slots 13 are arranged here in rows of holes 14. These rows of holes 14 each contain a plurality of spaced apart in the circumferential direction of the tube 4 slots 13 and are adjacent to each other in the longitudinal direction of the tube 4. Each row of holes 14 has four to eight elongated holes 13 or, for example, six elongated holes 13. To achieve the desired resilience of the tube 4 in the tube longitudinal direction, the elongated holes 13 of each row of holes 14 are offset relative to the slots 13 of an adjacent in the longitudinal direction of the tube 4 row of holes 14 in the circumferential direction of the tube 4. In the preferred embodiment shown here, an offset 15 between the oblong holes 13 of a row of holes 14 with respect to the oblong holes 13 of adjacent thereto in the tube longitudinal direction hole row 14 is exactly as large as measured in the tube circumferential direction half length 16 of a slot 13 plus a measured in the tube circumferential direction half Distance 17 between two adjacent oblong holes 13 of the same row of holes 14. This results from row of holes 14 to row of holes 14 with respect to the distances 17 symmetrical overlap of each adjacent slots 13. By the Offset 15 can be avoided by the longitudinal section 8 in the tube longitudinal direction continuous web.

Der in Rohrumfangsrichtung gemessene Abstand 17 benachbarter Langlöcher 13 derselben Lochreihe 14 beträgt z.B. etwa ein Drittel der Länge 16 eines der Langlöcher 13. Erfindungsgemäß ist ein in Rohrlängsrichtung gemessener Abstand 18 zwischen zwei benachbarten Lochreihen 14 etwa gleich groß gewählt sein, wie eine in der Rohrlängsrichtung gemessene Breite 19 eines der Langlöcher 13. Durch die bevorzugte Dimensionierung der Langlöcher 13 lässt sich in Verbindung mit der gewählten Anordnung der einzelnen Langlöcher 13 die gewünschte Federelastizität des Rohrs 4 in dessen Längsrichtung erzielen.The distance 17 of adjacent elongated holes 13 of the same row of holes 14 measured in the tube circumferential direction is e.g. According to the invention, a measured in the tube longitudinal direction distance 18 between two adjacent rows of holes 14 may be approximately the same size as a measured in the tube longitudinal width 19 of the elongated holes 13. By the preferred dimensioning of the slots 13 can be achieved in connection with the selected arrangement of the individual slots 13, the desired resilience of the tube 4 in the longitudinal direction.

Um die Federelastizität des Rohrs 4 möglichst weich auszugestalten, erstreckt sich der perforierte Längsabschnitt 8 zweckmäßig direkt vom ersten Endbereich 11 bis zum zweiten Endbereich 12.In order to make the spring elasticity of the tube 4 as soft as possible, the perforated longitudinal section 8 expediently extends directly from the first end region 11 to the second end region 12.

Bei der hier gezeigten Ausführungsform ist die Komponente 2 als Schalldämpfer, insbesondere als Vorschalldämpfer, ausgestaltet. Hierzu umschließt das Gehäuse 5 das Rohr 4 zwischen den Endbereichen 11, 12 radial beabstandet, wodurch radial zwischen dem Rohr 4 und dem Gehäuse 5 ein Ringraum 20 entsteht. Dieser Ringraum 20, auch Absorptionsraum genannt, ist vorzugsweise mit einem Schallschluckmaterial 21 oder Absorptionsmaterial befüllt. Im Betrieb der Brennkraftmaschine kann Luftschall, der sich im Abgas ausbreitet, quer zur Strömungsrichtung durch die Perforation 10 in den Ringraum 20 eintreten, wodurch er vom Schallschluckmaterial mehr oder weniger bedämpft wird. Bei einem derartigen Schalldämpfer durchsetzt das Rohr 4 das Gehäuse 5 vollständig, so dass die in Rohrlängsrichtung gemessene Länge des Gehäuses 5 etwa mit derjenigen des Rohrs 4 übereinstimmt.In the embodiment shown here, the component 2 is designed as a silencer, in particular as a front silencer. For this purpose, the housing 5 encloses the tube 4 radially spaced between the end regions 11, 12, whereby radially between the tube 4 and the housing 5, an annular space 20th arises. This annular space 20, also called absorption space, is preferably filled with a sound-absorbing material 21 or absorption material. During operation of the internal combustion engine, airborne sound which propagates in the exhaust gas can enter the annular space 20 transversely to the flow direction through the perforation 10, as a result of which it is more or less damped by the sound absorption material. In such a silencer, the tube 4 passes completely through the housing 5, so that the length of the housing 5 measured in the tube longitudinal direction approximately coincides with that of the tube 4.

Bei einer anderen Ausführungsform kann vorgesehen sein, dass sich das Rohr 4 nur innerhalb eines Teilbereichs des Gehäuses 5 erstreckt. Denkbar ist beispielsweise eine trichterförmige Ausgestaltung des Rohrs 4. Das Rohr 4 kann beispielweise einen Innentrichter bilden, der in einem als Außentrichter ausgestalteten Gehäuseabschnitt angeordnet ist, um eine Luftspaltisolation zu realisieren. Während derartige Innentrichter aufgrund der erwarteten thermischen Längenänderungen herkömmlicherweise an einem axialen Ende fliegend gelagert bzw. freistehend angeordnet sind, ist es durch den perforierten Längsabschnitt 8 möglich, das als Innentrichter ausgestaltete Rohr 4 an seinen beiden Endbereichen 11, 12 fest mit dem Gehäuse zu verbinden.In another embodiment, it can be provided that the tube 4 extends only within a portion of the housing 5. It is conceivable, for example, a funnel-shaped configuration of the tube 4. The tube 4 may for example form an inner funnel, which is arranged in a configured as an outer funnel housing portion to realize an air gap insulation. While such inner funnels are conventionally cantilevered or free-standing at one axial end due to the expected thermal length changes, it is possible through the perforated longitudinal section 8 to connect the tube 4 designed as an inner funnel to the housing at its two end regions 11, 12.

Claims (8)

  1. An exhaust-carrying component of an exhaust system (1) for an internal combustion engine, in particular in a motor vehicle,
    - having a pipe (4) through which exhaust gas can flow from one longitudinal end (6) to the other longitudinal end (7) and which has a longitudinal section (8) between its longitudinal ends (6, 7), the wall (9) of said longitudinal section being provided with perforations (10),
    - having a housing (5) which surrounds the pipe (4) in the circumferential direction and to which the pipe (4) is fixedly connected in one end area (11) having the one longitudinal end (6) and in another end area (12) having the other longitudinal end (7),
    - wherein the perforations (10) are formed by elongated holes (13) whose longitudinal direction extends in the circumferential direction of the pipe (4),
    - wherein the perforations (10) have multiple neighboring rows of holes (14) in the longitudinal direction of the pipe (4), each having several elongated holes (13) spaced a distance apart in the circumferential direction of the pipe (4),
    - wherein the elongated holes (13) of one row of holes (14) area arranged so they are offset in the circumferential direction of the pipe (4) with respect to the elongated holes (13) of a neighboring row of holes (14) in the longitudinal direction of the pipe (4),
    characterized in
    - that each row of holes (14) has four to eight elongated holes (13),
    - that neighboring rows of holes (14) in the longitudinal direction of the pipe (4) are spaced a distance (18) apart from one another that is approximately as great as the width (19) of a elongated hole (13) measured in the longitudinal direction of the pipe (4).
  2. The component according to Claim 1,
    characterized in that
    the perforations (10) are designed so that the longitudinal section (8) can absorb the thermal longitudinal expansion forces occurring between the pipe (4) and the housing (5) essentially through elastic deformation at the maximum expected temperature difference between the pipe (4) and the housing (5) during operation of the exhaust system (1).
  3. The component according to Claim 1 or 2,
    characterized in that
    each row of holes (14) has six elongated holes (13), and/or
    the elongated holes (13) of one row of holes (14) are arranged so they are offset in the circumferential direction of the pipe (4) by half a length (16) of a elongated hole (13) and half the distance (17) between two elongated holes (13) in comparison with the elongated holes (13) of a neighboring row of holes (14) in the longitudinal direction of the pipe (4), and/or
    in one row of holes (14) the distance (17) between neighboring elongated holes (13) measured in the circumferential direction of the pipe (4) is approximately one-third as great as the length (16) of the elongated hole (13) measured in the circumferential direction of the pipe (4).
  4. The component according to any one of Claims 1 to 3,
    characterized in that
    the perforated longitudinal section (8) extends from the one end area (11) to the other end area (12).
  5. The component according to any one of Claims 1 to 4,
    characterized in that
    the housing (5) is spaced a distance away from the pipe (4) radially between the end areas (11, 12) of the pipe (4) so that an annular space (20) is formed radially between the pipe (4) and the housing (5),
    and/or
    the annular space (20) is filled with sound-absorbing material (21).
  6. The component according to any one of Claims 1 to 5,
    characterized in that
    the pipe (4) is designed to be cylindrical or funnel-shaped, and/or
    the pipe (4) has a circular or elliptical cross section.
  7. The component according to any one of Claims 1 to 6,
    characterized in that
    the pipe (4) completely passes through the housing (5), and/or
    the component (2) is a front muffler.
  8. An exhaust system for an internal combustion engine, in particular in a motor vehicle, having at least one component (2) according to any one of Claims 1 to 7.
EP07102848.4A 2006-03-08 2007-02-22 Component of an exhaust system Ceased EP1832726B1 (en)

Applications Claiming Priority (1)

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DE102006011091A DE102006011091A1 (en) 2006-03-08 2006-03-08 Component of an exhaust system

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EP1832726A2 EP1832726A2 (en) 2007-09-12
EP1832726A3 EP1832726A3 (en) 2009-03-25
EP1832726B1 true EP1832726B1 (en) 2017-10-18

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JP (1) JP5389332B2 (en)
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CN105402005A (en) * 2015-12-18 2016-03-16 力帆实业(集团)股份有限公司 Gas exhausting system and pre-muffler thereof
CN110821602A (en) * 2019-11-11 2020-02-21 西安航天动力研究所 A tubular muffler
US11300021B2 (en) * 2019-11-14 2022-04-12 Purem Novi, Inc. Exhaust component with louver bridge for suppressing vehicle exhaust pipe resonances and vehicle exhaust system with exhaust component
JP7290677B2 (en) * 2021-01-27 2023-06-13 フタバ産業株式会社 Damping band and muffler

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Also Published As

Publication number Publication date
EP1832726A3 (en) 2009-03-25
JP2007239749A (en) 2007-09-20
CN101033703B (en) 2012-07-18
US20070209354A1 (en) 2007-09-13
CN101033703A (en) 2007-09-12
US7444806B2 (en) 2008-11-04
JP5389332B2 (en) 2014-01-15
DE102006011091A1 (en) 2007-09-13
EP1832726A2 (en) 2007-09-12

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