EP1860291B1 - Silencer intermediate wall - Google Patents

Silencer intermediate wall Download PDF

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Publication number
EP1860291B1
EP1860291B1 EP07106788A EP07106788A EP1860291B1 EP 1860291 B1 EP1860291 B1 EP 1860291B1 EP 07106788 A EP07106788 A EP 07106788A EP 07106788 A EP07106788 A EP 07106788A EP 1860291 B1 EP1860291 B1 EP 1860291B1
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EP
European Patent Office
Prior art keywords
silencer
silencer base
opening
muffler
slits
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.)
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Application number
EP07106788A
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German (de)
French (fr)
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EP1860291A1 (en
Inventor
Robert Hanitzsch
Arnulf Spieth
Thomas Werber
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 Climate Control Systems GmbH and Co KG
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J Eberspaecher GmbH and Co KG
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Publication of EP1860291A1 publication Critical patent/EP1860291A1/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00Silencing apparatus characterised by method of silencing
    • F01N1/08Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F01N1/089Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using two or more expansion chambers in series
    • 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
    • F01N13/18Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1838Construction facilitating manufacture, assembly, or disassembly characterised by the type of connection between parts of exhaust or silencing apparatus, e.g. between housing and tubes, between tubes and baffles
    • 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
    • F01N2260/00Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/10Exhaust treating devices having provisions not otherwise provided for for avoiding stress caused by expansions or contractions due to temperature variations
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2490/00Structure, disposition or shape of gas-chambers
    • F01N2490/08Two or more expansion chambers in series separated by apertured walls only

Definitions

  • the present invention relates to a sheet-metal component, namely a silencer bottom, with at least one passage opening for a tubular component, in particular for an exhaust pipe, according to the preamble of claim 1.
  • a tubular member In a variety of applications, it is necessary to insert and connect a tubular member through a through hole of a sheet-like member.
  • Such an application is for example a muffler bottom of an exhaust system for an internal combustion engine, in particular in a motor vehicle, which is penetrated by an exhaust pipe.
  • a mechanical load in the region of the connection of the tubular component to the sheet-shaped component, ie to the muffler floor may occur, with force peaks causing a peripheral edge of the through opening to tear.
  • annular leaf spring having an outer ring and an inner ring, the are integrally connected to each other on two rings ringseqmentförmige spring arms connected to each other and are resiliently positioned in two planes relative to each other.
  • the present invention addresses the problem of providing an improved embodiment for a silencer floor of the generic type, which is characterized in particular by a better shelf life.
  • the invention is based on the general idea, in a muffler bottom, which has a passage opening for a tubular component, in an area adjacent to the through-opening region to provide at least one slot-shaped component penetrating slot, which runs in the circumferential direction of the through hole or tangentially to the same.
  • One or more such slots cause the operation of the exhaust system or when heating the tubular member an improved force into the muffler floor and lead to a serpentine flow of force around the arranged in the muffler bottom slots around. Due to the serpentine flow pattern, the force is introduced on a much longer path in the muffler floor, so that it is able to absorb the introduced force in the elastic range and thus without deformation or without damage.
  • the at least one slot penetrating the muffler floor can be produced by a suitable cutting operation with or without material removal.
  • Such a punching process can be realized without cutting, whereby the tool used in this case can achieve a long service life and thereby reduces the manufacturing cost of the muffler floor.
  • the slot has at each end a rounding which enlarges the slot width, or the longitudinal end-side end sections of the slot are bent semicircularly. Both variants cause a favorable flow of force in the longitudinal end region of the slot and thereby reduce the risk of tearing the slot end.
  • the described configuration of the longitudinal end regions of the slots thus voltage peaks can be better absorbed and at the same time the life of the muffler floor can be increased.
  • At least two slots have different lengths.
  • the longitudinal extent of the slots can be adjusted individually to the occurring or expected force flow, whereby the muffler floor can be aligned particularly well in the production of the loads occurring in the later operating state.
  • a plurality of slots are arranged along a plurality of radially spaced-apart circles. These circles do not necessarily have the same center and cause a favorable force flow of the force to be introduced in particular in a chosen in the manner of a staggered association arrangement of the slots along the circles.
  • the force flow is forced to a serpentine line, whereby the distance traveled extends. This extended force introduction path causes the material to be able to absorb the introduced force in the elastic region, so that there are no, in particular permanent, plastic deformations during operation.
  • Fig. 1 has a sheet-metal component, namely a muffler bottom 1 at least one through hole 2, here a total of three through holes 2, 2 ', 2 ", wherein at least one through-hole 2, not shown, tubular member, in particular an exhaust pipe, can be performed the sheet-like member is formed here as a muffler floor 1 and may be part of a muffler, not shown, moreover, an exhaust system for an internal combustion engine, in particular a motor vehicle.
  • the muffler floor 1 in a region adjacent to the passage opening 2 a plurality of the muffler floor 1 penetrating slots 3, which extend substantially in the circumferential direction of or tangential to the passage opening 2.
  • the slots 3 can have a curved or a straight course.
  • the muffler floor 1 further, the muffler floor 1 penetrating openings 4, which according to the Fig. 1 arranged in a grid shape offset from one another.
  • the openings 4 are, however, purely exemplary, so that muffler floors 1 according to the Fig. 2 should be included in the invention, which have no additional openings 4.
  • the slots 3 can, for example, a slot width-increasing fillet 5 (see. Fig. 2 ), which cause an improved flow of force within the muffler floor 1.
  • the longitudinal end-side end portions of the slots 3 may also be bent in a semicircle, which causes the same effect.
  • the fillets 5 and the bent end portions are preferably arranged concave to each other and are radially from the respective slot 3 to the outside.
  • the slots 3 are arranged along a plurality of radially spaced circles 6, which either, as in Fig. 1 shown, do not have a common center, or, as in Fig. 2 shown concentric to each other are arranged. Regardless of the arrangement of the circles 6 to each other, the slots 3 are preferably arranged in a kind of offset association to each other along the radially spaced-apart circles 6.
  • Such a staggered dressing is known, for example from the field of masonry and causes in any layer (here circles 6) butt joints between individual slots 3 are continuous.
  • the tubular component (not shown) penetrates at least the passage opening 2 and is fixedly connected to the muffler floor 1 in the region of the passage opening 2, eg by welding or soldering. During operation, this can lead to a heating of the tubular component, so that it expands in the circumferential direction. Such expansion causes a force acting in the circumferential direction on an edge 7 of the through hole 2, which would lead to tearing of the edge 7 in the worst case. In order to prevent such tearing, the slits 3 are provided in the region adjacent to the through-hole 2.
  • the slots 3 thereby cause a deflection of the power flow, whereby the path for the introduction of force is extended, preferably such that the muffler bottom 1 can record the example entered due to the thermal expansion force in the elastic range.
  • the above-described arrangement of the slots 3 in the manner of a staggered bandage along the radially spaced circles 6 causes a forced, serpentine course of the power flow between the slots 3 and thereby extends the force introduction path in a particularly advantageous manner.
  • the arrangement of the slots 3 along the radially spaced circles 6 is to be understood purely as an example, so that, for example, an arrangement of the slots 3 along bent in the circumferential direction of rays is conceivable.
  • the slots 3 may have different lengths and thereby be particularly well adapted to the expected force entry. It is also conceivable that the slots 3 are arranged only on a limiting circumferential segment around the passage opening 2 around, as for example in Fig. 1 is shown, or fully around the through hole 2 around, as shown in Fig. 2 is shown.
  • the sheet-metal component as described above is designed as a muffler floor 1 and thereby forms part of a muffler, for example, for an exhaust system of a motor vehicle.
  • a muffler floor 1 has the task of a partition, which separates two spaces in the muffler from each other.
  • one of the rooms may be an absorption space that may be filled with a sound-absorbing substance or with absorption material.
  • the muffler floor 1 is fixed in this embodiment to a housing, not shown, of the muffler, in particular welded.
  • the Muffler bottom 1 made of a plastic or metal, in particular made of sheet metal, be formed.
  • sheet-like is to be understood here merely that in a Cartesian coordinate system, the component 1 has a significantly smaller thickness than its extension in the longitudinal or width direction.
  • the sheet-metal component that is to say here the muffler bottom 1
  • the invention proposes, in the case of a sheet-metal component 1, namely a silencer base 1 with a passage opening 2 for a tubular component, in the area around the passage opening 2 or in an area adjacent thereto, to provide the silencer floor 1 with penetrating slots 3 are formed and arranged so that an introduction of force through the tubular component, in particular by a thermal expansion thereof, can be accommodated in the elastic region of the silencer bottom 1.
  • the slots 3 are arranged to extend essentially in the circumferential direction or tangentially to the passage opening 2.

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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 ein blechförmiges Bauteil, nämlich einen Schalldämpferboden, mit zumindest einer Durchgangsöffnung für ein rohrförmiges Bauteil, insbesondere für ein Abgasrohr, gemäß dem Oberbegriff des Anspruchs 1.The present invention relates to a sheet-metal component, namely a silencer bottom, with at least one passage opening for a tubular component, in particular for an exhaust pipe, according to the preamble of claim 1.

In einer Vielzahl von Anwendungen ist es erforderlich, ein rohrförmiges Bauteil durch eine Durchgangsöffnung eines blechförmigen Bauteils hindurch zustecken und mit diesem zu verbinden. Eine derartige Anwendung ist beispielsweise ein Schalldämpferboden einer Abgasanlage für eine Brennkraftmaschine, insbesondere in einem Kraftfahrzeug, welcher von einem Abgasrohr durchdrungen ist. Beim Betrieb der Abgasanlage kann es aufgrund unterschiedlicher Temperaturdehnungen zu einer mechanischen Belastung im Bereich der Anbindung des rohrförmigen Bauteils an das blechförmige Bauteil, also an den Schalldämpferboden kommen, wobei Kraftspitzen dazu führen können, dass ein Umfangsrand der Durchgangsöffnung einreißt.In a variety of applications, it is necessary to insert and connect a tubular member through a through hole of a sheet-like member. Such an application is for example a muffler bottom of an exhaust system for an internal combustion engine, in particular in a motor vehicle, which is penetrated by an exhaust pipe. During operation of the exhaust system, due to different thermal expansions, a mechanical load in the region of the connection of the tubular component to the sheet-shaped component, ie to the muffler floor, may occur, with force peaks causing a peripheral edge of the through opening to tear.

Aus der EP 0 828 064 A2 ist eine ringförmige Blattfeder bekannt, die einen Außenring und einen Innenring aufweist, die über mehrere an beiden Ringen integral ausgeformte ringseqmentförmige Federarme miteinander verbunden sind und in zwei Ebenen relativ zueinander federnd positioniert sind.From the EP 0 828 064 A2 is known an annular leaf spring having an outer ring and an inner ring, the are integrally connected to each other on two rings ringseqmentförmige spring arms connected to each other and are resiliently positioned in two planes relative to each other.

Die vorliegende Erfindung beschäftigt sich mit dem Problem, für einen Schalldämpferboden der gattungsgemäßen Art eine verbesserte Ausführungsform anzugeben, die sich insbesondere durch eine bessere Haltbarkeitsdauer auszeichnet.The present invention addresses the problem of providing an improved embodiment for a silencer floor of the generic type, which is characterized in particular by a better shelf life.

Dieses Problem wird durch den Gegenstand des unabhängigen Anspruchs gelöst. Vorteilhafte Ausführungsformen sind Gegenstand der abhängigen Ansprüche.This problem is solved by the subject matter of the independent claim. Advantageous embodiments are the subject of the dependent claims.

Die Erfindung beruht auf dem allgemeinen Gedanken, bei einem Schalldämpferboden, der eine Durchgangsöffnung für ein rohrförmiges Bauteil aufweist, in einem an die Durchgangsöffnung angrenzenden Bereich wenigstens einen das blechförmige Bauteil durchdringenden Schlitz vorzusehen, welcher in Umfangsrichtung der Durchgangsöffnung oder tangential zu derselben verläuft. Ein bzw. mehrere derartiger Schlitze bewirken beim Betrieb der Abgasanlage bzw. beim Erwärmen des rohrförmigen Bauteils eine verbesserte Krafteinleitung in den Schalldämpferboden und führen zu einem schlangenlinienartig verlaufenden Kraftfluss um die im Schalldämpferboden angeordneten Schlitze herum. Aufgrund des schlangenlinienförmigen Kraftflussverlaufs wird die Kraft auf einem deutlich längeren Weg in den Schalldämpferboden eingebracht, so dass dieser in der Lage ist, die eingeleitete Kraft im elastischen Bereich und damit ohne Verformungen bzw. ohne Beschädigungen aufzunehmen. Durch die Beseitigung von Spannungsspitzen, welche den elastischen Bereich des Schalldämpferbodens übersteigen, kann die Lebensdauer der aus dem rohrförmigen und dem blechförmigen Bauteil gebildeten Bauteilanordnung signifikant erhöht werden.The invention is based on the general idea, in a muffler bottom, which has a passage opening for a tubular component, in an area adjacent to the through-opening region to provide at least one slot-shaped component penetrating slot, which runs in the circumferential direction of the through hole or tangentially to the same. One or more such slots cause the operation of the exhaust system or when heating the tubular member an improved force into the muffler floor and lead to a serpentine flow of force around the arranged in the muffler bottom slots around. Due to the serpentine flow pattern, the force is introduced on a much longer path in the muffler floor, so that it is able to absorb the introduced force in the elastic range and thus without deformation or without damage. By eliminating stress peaks that exceed the elastic range of the muffler floor, the life of the component arrangement formed from the tubular and the sheet-metal component can be significantly increased.

Grundsätzlich kann der wenigstens eine den Schalldämpferboden durchdringende Schlitz durch einen geeigneten Schneidvorgang mit oder ohne Materialabtragung hergestellt werden. Bevorzugt wird eine Ausführungsform, bei welcher der jeweilige Schlitz dadurch hergestellt wird, dass ein Bereich des Schalldämpferbodens, der im an die Durchgangsöffnung angrenzenden Bereich liegt, ausgestellt bzw. durchgestellt wird, z.B. durch einen entsprechenden Stanzvorgang. Ein derartiger Stanzvorgang lässt sich spanlos realisieren, wodurch das dabei verwendete Werkzeug eine hohe Standzeit erreichen kann und dadurch die Herstellungskosten für den Schalldämpferboden reduziert.In principle, the at least one slot penetrating the muffler floor can be produced by a suitable cutting operation with or without material removal. Preferred is an embodiment in which the respective slot is made by exposing a portion of the muffler floor lying in the area adjacent to the passage opening, e.g. by a corresponding punching process. Such a punching process can be realized without cutting, whereby the tool used in this case can achieve a long service life and thereby reduces the manufacturing cost of the muffler floor.

Zweckmäßig weist der Schlitz jeweils endseitig eine die Schlitzweite vergrößernde Ausrundung auf oder es sind die längsendseitigen Endabschnitte des Schlitzes halbkreisförmig gebogen. Beide Varianten bewirken einen günstigen Kraftfluss im längsendseitigen Bereich des Schlitzes und vermindern dadurch die Gefahr des Einreißens des Schlitzendes. Durch die beschriebene Ausgestaltung der längsendseitigen Bereiche der Schlitze können somit Spannungsspitzen besser aufgenommen werden und gleichzeitig die Lebensdauer des Schalldämpferbodens erhöht werden.Expediently, the slot has at each end a rounding which enlarges the slot width, or the longitudinal end-side end sections of the slot are bent semicircularly. Both variants cause a favorable flow of force in the longitudinal end region of the slot and thereby reduce the risk of tearing the slot end. The described configuration of the longitudinal end regions of the slots thus voltage peaks can be better absorbed and at the same time the life of the muffler floor can be increased.

Bei einer vorteilhaften Ausführungsform der erfindungsgemäßen Lösung weisen zumindest zwei Schlitze unterschiedliche Längen auf. Die Längserstreckung der Schlitze kann dabei individuell an den auftretenden bzw. erwartenden Kraftfluss angepasst werden, wodurch der Schalldämpferboden bereits in der Fertigung besonders gut auf die im späteren Betriebszustand auftretenden Belastungen ausgerichtet werden kann.In an advantageous embodiment of the solution according to the invention, at least two slots have different lengths. The longitudinal extent of the slots can be adjusted individually to the occurring or expected force flow, whereby the muffler floor can be aligned particularly well in the production of the loads occurring in the later operating state.

Bei einer weiteren vorteilhaften Ausführungsform der erfindungsgemäßen Lösung sind mehrere Schlitze entlang mehrerer, radial zueinander beabstandeter Kreise angeordnet. Diese Kreise müssen nicht unbedingt denselben Mittelpunkt haben und bewirken insbesondere bei einer in der Art eines versetzten Verbandes gewählten Anordnung der Schlitze entlang der Kreise einen günstigen Kraftfluss der einzuleitenden Kraft. Durch die in der Art des versetzten Verbandes angeordneten Schlitze wird der Kraftfluss auf eine Schlangenlinie gezwungen, wodurch sich der zurückgelegte Weg verlängert. Dieser verlängerte Krafteinleitungsweg bewirkt, dass das Material in der Lage ist, die eingeleitete Kraft im elastischen Bereich aufnehmen zu können, so dass es zu keinen, insbesondere bleibenden, plastischen Verformungen während des Betriebs kommt.In a further advantageous embodiment of the solution according to the invention a plurality of slots are arranged along a plurality of radially spaced-apart circles. These circles do not necessarily have the same center and cause a favorable force flow of the force to be introduced in particular in a chosen in the manner of a staggered association arrangement of the slots along the circles. By arranged in the manner of the staggered association slots the force flow is forced to a serpentine line, whereby the distance traveled extends. This extended force introduction path causes the material to be able to absorb the introduced force in the elastic region, so that there are no, in particular permanent, plastic deformations during operation.

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

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

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

Es zeigen, jeweils schematisch,

Fig. 1
ein Schalldämpferboden mit den dieses durchdringenden, erfindungsgemäßen Schlitzen,
Fig. 2
eine Darstellung wie in Fig. 1, jedoch bei einer anderen Ausführungsform.
Show, in each case schematically,
Fig. 1
a muffler floor with the slits penetrating this invention,
Fig. 2
a representation like in Fig. 1 but in another embodiment.

Entsprechend Fig. 1 weist ein blechförmiges Bauteil, nämlich ein Schalldämpferboden 1 zumindest eine Durchgangsöffnung 2 auf, hier insgesamt drei Durchgangsöffnungen 2, 2', 2" , wobei zumindest durch die eine Durchgangsöffnung 2 ein nicht gezeigtes rohrförmiges Bauteil, insbesondere ein Abgasrohr, geführt werden kann. Dementsprechend ist das blechförmige Bauteil hier als Schalldämpferboden 1 ausgebildet und kann Teil eines im Übrigen nicht dargestellten Schalldämpfers einer Abgasanlage für einen Verbrennungsmotor, insbesondere in einem Kraftfahrzeug, sein. Wie der Fig. 1 weiter zu entnehmen ist, weist der Schalldämpferboden 1 in einem an die Durchgangsöffnung 2 angrenzenden Bereich mehrere, den Schalldämpferboden 1 durchdringende Schlitze 3 auf, die im wesentlichen in Umfangsrichtung der oder tangential zur Durchgangsöffnung 2 verlaufen. Die Schlitze 3 können dabei eine gebogenen oder einen geradlinigen Verlauf aufweisen. Neben den Schlitzen 3 kann der Schalldämpferboden 1 weitere, den Schalldämpferboden 1 durchdringende Öffnungen 4 aufweisen, welche gemäß der Fig. 1 rasterförmig versetzt zueinander angeordnet sind. Die Öffnungen 4 sind dabei jedoch rein exemplarisch, so dass auch Schalldämpferböden 1 gemäß der Fig. 2 von der Erfindung mit umfasst sein sollen, welche keine zusätzlichen Öffnungen 4 aufweisen.Corresponding Fig. 1 has a sheet-metal component, namely a muffler bottom 1 at least one through hole 2, here a total of three through holes 2, 2 ', 2 ", wherein at least one through-hole 2, not shown, tubular member, in particular an exhaust pipe, can be performed the sheet-like member is formed here as a muffler floor 1 and may be part of a muffler, not shown, moreover, an exhaust system for an internal combustion engine, in particular a motor vehicle. Again Fig. 1 can be seen further, the muffler floor 1 in a region adjacent to the passage opening 2 a plurality of the muffler floor 1 penetrating slots 3, which extend substantially in the circumferential direction of or tangential to the passage opening 2. The slots 3 can have a curved or a straight course. In addition to the slots 3, the muffler floor 1 further, the muffler floor 1 penetrating openings 4, which according to the Fig. 1 arranged in a grid shape offset from one another. The openings 4 are, however, purely exemplary, so that muffler floors 1 according to the Fig. 2 should be included in the invention, which have no additional openings 4.

Längsendseitig der Schlitze 3 können diese beispielsweise eine die Schlitzweite vergrößernde Ausrundung 5 (vgl. Fig. 2) aufweisen, welche einen verbesserten Kraftfluss innerhalb des Schalldämpferbodens 1 bewirken. Anstatt der Ausrundung 5 können die längsendseitigen Endabschnitte der Schlitze 3 auch halbkreisförmig gebogen sein, was denselben Effekt hervorruft. Die Ausrundungen 5 bzw. die gebogenen Endabschnitte sind vorzugsweise konkav zueinander angeordnet und stehen vom jeweiligen Schlitz 3 radial nach außen ab.Longitudinal end of the slots 3, these can, for example, a slot width-increasing fillet 5 (see. Fig. 2 ), which cause an improved flow of force within the muffler floor 1. Instead of the fillet 5, the longitudinal end-side end portions of the slots 3 may also be bent in a semicircle, which causes the same effect. The fillets 5 and the bent end portions are preferably arranged concave to each other and are radially from the respective slot 3 to the outside.

Dabei sind die Schlitze 3 entlang mehrerer, radial zueinander beabstandeter Kreise 6 angeordnet, welche entweder, wie in Fig. 1 gezeigt, nicht über einen gemeinsamen Mittelpunkt verfügen, oder, wie in Fig. 2 gezeigt, konzentrisch zueinander angeordnet sind. Unabhängig von der Anordnung der Kreise 6 zueinander sind die Schlitze 3 vorzugsweise in einer Art versetztem Verband zueinander entlang der radial zueinander beabstandeten Kreise 6 angeordnet. Ein derartiger versetzter Verband ist beispielsweise aus dem Bereich des Mauerwerks bekannt und bewirkt, dass in keiner Schicht (hier Kreise 6) Stoßfugen zwischen einzelnen Schlitzen 3 durchgängig verlaufen.The slots 3 are arranged along a plurality of radially spaced circles 6, which either, as in Fig. 1 shown, do not have a common center, or, as in Fig. 2 shown concentric to each other are arranged. Regardless of the arrangement of the circles 6 to each other, the slots 3 are preferably arranged in a kind of offset association to each other along the radially spaced-apart circles 6. Such a staggered dressing is known, for example from the field of masonry and causes in any layer (here circles 6) butt joints between individual slots 3 are continuous.

In montiertem Zustand durchdringt das rohrförmige, nicht gezeigte, Bauteil zumindest die Durchgangsöffnung 2 und ist im Bereich der Durchgangsöffnung 2 fest mit dem Schalldämpferboden 1 verbunden, z.B. durch Verschweißen oder Verlöten. Im Betrieb kann es dabei zu einer Erwärmung des rohrförmigen Bauteils kommen, so dass sich dieses in Umfangsrichtung ausdehnt. Eine derartige Ausdehnung bewirkt eine in Umfangsrichtung wirkende Kraft an einem Rand 7 der Durchgangsöffnung 2, welche im ungünstigsten Fall zu einem Einreißen des Randes 7 führen würde. Um ein derartiges Einreißen zu verhindern, sind die Schlitze 3 im an die Durchgangsöffnung 2 angrenzenden Bereich vorgesehen. Die Schlitze 3 bewirken dabei eine Umlenkung des Kraftflusses, wodurch der Weg zur Krafteinleitung verlängert wird, vorzugsweise derart, dass der Schalldämpferboden 1 die beispielsweise aufgrund der Temperaturdehnung eingetragene Kraft im elastischen Bereich aufnehmen kann. Die oben beschriebene Anordnung der Schlitze 3 in der Art eines versetzten Verbandes entlang der radial zueinander beabstandeten Kreise 6 bewirkt dabei einen erzwungenen, schlangenförmigen Verlauf des Kraftflusses zwischen den Schlitzen 3 hindurch und verlängert dadurch den Krafteinleitungsweg in besonders vorteilhafter Weise. Die Anordnung der Schlitze 3 entlang der radial zueinander beabstandeten Kreise 6 ist dabei rein exemplarisch zu verstehen, so dass beispielsweise auch eine Anordnung der Schlitze 3 entlang von in Umfangsrichtung gebogenen Strahlen denkbar ist.In the assembled state, the tubular component (not shown) penetrates at least the passage opening 2 and is fixedly connected to the muffler floor 1 in the region of the passage opening 2, eg by welding or soldering. During operation, this can lead to a heating of the tubular component, so that it expands in the circumferential direction. Such expansion causes a force acting in the circumferential direction on an edge 7 of the through hole 2, which would lead to tearing of the edge 7 in the worst case. In order to prevent such tearing, the slits 3 are provided in the region adjacent to the through-hole 2. The slots 3 thereby cause a deflection of the power flow, whereby the path for the introduction of force is extended, preferably such that the muffler bottom 1 can record the example entered due to the thermal expansion force in the elastic range. The above-described arrangement of the slots 3 in the manner of a staggered bandage along the radially spaced circles 6 causes a forced, serpentine course of the power flow between the slots 3 and thereby extends the force introduction path in a particularly advantageous manner. The arrangement of the slots 3 along the radially spaced circles 6 is to be understood purely as an example, so that, for example, an arrangement of the slots 3 along bent in the circumferential direction of rays is conceivable.

Wie in den Fig. 1 und 2 weiter gezeigt, können die Schlitze 3 unterschiedliche Längen aufweisen und dadurch besonders gut an den zu erwartenden Krafteintrag angepasst sein. Denkbar ist auch, dass die Schlitze 3 nur auf einem begrenzenden Umfangssegment um die Durchgangsöffnung 2 herum angeordnet sind, wie dies beispielsweise in Fig. 1 gezeigt ist, oder aber voll umfänglich um die Durchgangsöffnung 2 herum, wie dies in Fig. 2 gezeigt ist.As in the Fig. 1 and 2 shown further, the slots 3 may have different lengths and thereby be particularly well adapted to the expected force entry. It is also conceivable that the slots 3 are arranged only on a limiting circumferential segment around the passage opening 2 around, as for example in Fig. 1 is shown, or fully around the through hole 2 around, as shown in Fig. 2 is shown.

Generell ist das blechförmige Bauteil wie eingangs beschriebenen als Schalldämpferboden 1 ausgebildet und bildet dadurch einen Teil eines Schalldämpfers, beispielsweise für eine Abgasanlage eines Kraftfahrzeugs. Ein derartiger Schalldämpferboden 1 hat beispielsweise die Aufgabe einer Trennwand, welche zwei Räume im Schalldämpfer voneinander trennt. Dabei kann es sich bei einem der Räume beispielsweise um einen Absorptionsraum handeln, der mit einem Schallschluckstoff oder mit Absorptionsmaterial befüllt sein kann. Der Schalldämpferboden 1 ist bei dieser Ausführungsform an einem nicht gezeigten Gehäuse des Schalldämpfers befestigt, insbesondere angeschweißt. Grundsätzlich kann dabei der Schalldämpferboden 1 aus einem Kunststoff oder aus Metall, insbesondere aus Blech, ausgebildet sein. Unter blechförmig soll hierbei lediglich verstanden werden, dass bei einem kartesischen Koordinatensystem das Bauteil 1 eine deutlich kleinere Dicke aufweist, als dessen Erstreckung in Längs- bzw. Breitenrichtung. Generell kann das blechförmige Bauteil, also hier der Schalldämpferboden 1 grundsätzlich einen beliebigen, dreidimensionalen Verlauf aufweisen und muss sich nicht in einer Ebene erstrecken.In general, the sheet-metal component as described above is designed as a muffler floor 1 and thereby forms part of a muffler, for example, for an exhaust system of a motor vehicle. Such a muffler floor 1, for example, has the task of a partition, which separates two spaces in the muffler from each other. For example, one of the rooms may be an absorption space that may be filled with a sound-absorbing substance or with absorption material. The muffler floor 1 is fixed in this embodiment to a housing, not shown, of the muffler, in particular welded. Basically, while the Muffler bottom 1 made of a plastic or metal, in particular made of sheet metal, be formed. The term sheet-like is to be understood here merely that in a Cartesian coordinate system, the component 1 has a significantly smaller thickness than its extension in the longitudinal or width direction. In general, the sheet-metal component, that is to say here the muffler bottom 1, can in principle have an arbitrary, three-dimensional course and does not have to extend in one plane.

Zusammenfassend lassen sich die wesentlichen Merkmale der erfindungsgemäßen Lösung wie folgt charakterisieren:In summary, the essential features of the solution according to the invention can be characterized as follows:

Die Erfindung schlägt vor, bei einem blechförmigen Bauteil 1, nämlich bei einem Schalldämpferboden 1 mit einer Durchgangsöffnung 2 für ein rohrförmiges Bauteil, im Bereich um die Durchgangsöffnung 2 herum bzw. in einem an diese angrenzenden Bereich, den Schalldämpferboden 1 durchdringende Schlitze 3 vorzusehen, welche so ausgebildet und angeordnet sind, dass eine Krafteinleitung durch das rohrförmige Bauteil, insbesondere durch eine Temperaturdehnung desselben, im elastischen Bereich des Schalldämpferbodens 1 aufgenommen werden kann. Dazu sind die Schlitze 3 im Wesentlichen in Umfangsrichtung oder tangential zur Durchgangsöffnung 2 verlaufend angeordnet.The invention proposes, in the case of a sheet-metal component 1, namely a silencer base 1 with a passage opening 2 for a tubular component, in the area around the passage opening 2 or in an area adjacent thereto, to provide the silencer floor 1 with penetrating slots 3 are formed and arranged so that an introduction of force through the tubular component, in particular by a thermal expansion thereof, can be accommodated in the elastic region of the silencer bottom 1. For this purpose, the slots 3 are arranged to extend essentially in the circumferential direction or tangentially to the passage opening 2.

Claims (10)

  1. A silencer base (1), more preferably a silencer base with at least a through opening (2) for a pipe-shaped component, more preferably for an exhaust pipe, characterized in that the silencer base (1) in a region adjoining the through opening (2) comprises at least one slit (3) penetrating the silencer base (1), which substantially runs in circumferential direction of the through opening (2) or tangentially to the through opening (2).
  2. The silencer base according to Claim 1, characterized
    - in that the slit (3) on each longitudinal end side comprises a rounding (5) enlarging the slit width, or
    - in that the end sections of the slits (3) on the longitudinal end side are bent in the shape of a semicircle.
  3. The silencer base according to Claim 2, characterized in that the roundings (5) or the bent end sections are arranged concavely to each other and from the slit (3) face radially outward.
  4. The silencer base according to any one of the Claims 1 to 3, characterized in that a plurality of slits (3) is arranged along a plurality of circles (6) radially spaced from each other.
  5. The silencer base according to Claim 4, characterized in that the slits (3) are arranged in a kind of offset formation along the circles (6) radially spaced from each other.
  6. The silencer base according to Claim 5, characterized in that the circles (6) touch one another in a point.
  7. The silencer base according to any one of the Claims 1 to 6, characterized in that at least two slits (3) have different lengths.
  8. The silencer base according to any one of the Claims 1 to 7, characterized in that the slits (3) are arranged on a limited circumferential segment about the through opening (2).
  9. The silencer base according to any one of the Claims 1 to 8, characterized in that a pipe-shaped component is permanently connected with the silencer base (1) in the region of the through opening (2).
  10. A silencer for a combustion engine with a silencer base (1) according to any one of the Claims 1 to 9 and a pipe-shaped component which in the installed state penetrates the silencer base (1) in the through opening (2) and on the through opening (2) is connected with the silencer base (1).
EP07106788A 2006-05-23 2007-04-24 Silencer intermediate wall Active EP1860291B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006024576A DE102006024576A1 (en) 2006-05-23 2006-05-23 Sheet-shaped component

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EP1860291A1 EP1860291A1 (en) 2007-11-28
EP1860291B1 true EP1860291B1 (en) 2009-07-22

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US (1) US7543682B2 (en)
EP (1) EP1860291B1 (en)
JP (1) JP5161487B2 (en)
CN (1) CN101078362B (en)
DE (2) DE102006024576A1 (en)

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CN109057918A (en) * 2018-10-15 2018-12-21 上海天纳克排气系统有限公司 The partition of silencer

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DE102006024576A1 (en) 2007-11-29
JP2007315391A (en) 2007-12-06
JP5161487B2 (en) 2013-03-13
EP1860291A1 (en) 2007-11-28
US20080121460A1 (en) 2008-05-29
CN101078362A (en) 2007-11-28
CN101078362B (en) 2010-12-08
DE502007001092D1 (en) 2009-09-03
US7543682B2 (en) 2009-06-09

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