EP1657414B1 - Silencer - Google Patents

Silencer Download PDF

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Publication number
EP1657414B1
EP1657414B1 EP05108715A EP05108715A EP1657414B1 EP 1657414 B1 EP1657414 B1 EP 1657414B1 EP 05108715 A EP05108715 A EP 05108715A EP 05108715 A EP05108715 A EP 05108715A EP 1657414 B1 EP1657414 B1 EP 1657414B1
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EP
European Patent Office
Prior art keywords
tongues
tongue
sliding seat
housing
muffler according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP05108715A
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German (de)
French (fr)
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EP1657414A1 (en
Inventor
Michael Staut
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
Original Assignee
J Eberspaecher GmbH and Co KG
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Publication of EP1657414A1 publication Critical patent/EP1657414A1/en
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Publication of EP1657414B1 publication Critical patent/EP1657414B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • 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
    • F01N13/1872—Construction facilitating manufacture, assembly, or disassembly the assembly using stamp-formed parts or otherwise deformed sheet-metal
    • 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
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F01N1/083—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using transversal baffles defining a tortuous path for the gases or successively throttling gas flow
    • 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

Definitions

  • the present invention relates to a silencer for a gas and airborne sounding conduit, in particular for an exhaust system of an internal combustion engine, preferably in a motor vehicle.
  • a silencer of the type mentioned in the introduction.
  • the muffler is flowed through by the gas transported in the line.
  • the entrained airborne sound enters the muffler with the gas and is attenuated therein, for example by means of reflections, resonances and sound-absorbing materials.
  • the gas then flows out of the muffler at a reduced airborne sound level.
  • Such mufflers are preferably used in exhaust systems of the internal combustion engine, in particular in motor vehicles, in order to dampen the sound generated by the internal combustion engine which propagates through the exhaust system.
  • a muffler for example, to dampen the sound generated by a compressor of an exhaust gas turbocharger.
  • the attenuation of airborne sound may also be of interest in other gas-carrying lines, so that the present invention should in principle not be restricted to applications in internal combustion engines.
  • the two inner floors have only a comparatively small distance from each other, the housing has a particularly high rigidity in this area.
  • the introduction of such an inner bottom at least for series products associated with relatively high costs.
  • this increases the weight of the muffler.
  • the present invention is concerned with the problem of providing a muffler of the type mentioned an improved embodiment, which is characterized in particular by a reduced weight and a low-cost structure.
  • the invention is based on the general idea to attach both inner tubes to one and the same inner bottom and to form at this inner bottom at least one attached to the one inner tube resilient first tongue and at least one attached to the other inner tube, resilient second tongue, which is independent of the at least a first tongue is resiliently movable. Due to this design, the resilient tongues can thermally Conditional changes in length of the inner tubes follow independently, without causing unacceptably high stresses within the inner bottom.
  • a particular advantage of the present invention is that a complete inner bottom can be omitted, which brings a great cost saving and weight reduction.
  • the invention uses the knowledge that in the physicallysteifenden area of the housing sufficient stiffening can be achieved with a single inner bottom, so that a second inner bottom is not required, at least in terms of stiffening of the housing in this housing section. It is also important for the invention that both inner tubes are supported in the region of the sliding seat independently of each other via the one common inner bottom of the housing, resulting in a stable and positionally fixed positioning for both inner tubes in the housing.
  • the tongues may be formed by free cutting or free punching on the inner bottom.
  • the tongues can be made particularly simple and inexpensive.
  • the tongues are integrated into the inner floor or form an integral component with the inner bottom. This integral construction has the advantage that no separately produced tongues need to be attached to the inner bottom with additional work.
  • the inner tubes may be radially spaced apart in the sliding seat region. That is, the inner tubes have in the Sliding seat radial play and do not touch. Such a sliding seat is inevitably leaking, but this is harmless depending on the flow in the silencer. It is advantageous in this non-contact sliding seat that in particular a tension of the two inner tubes can be avoided in the sliding seat due to thermally induced radial expansions, so that the axial mobility of the two inner tubes is ensured in the sliding seat accordingly.
  • a muffler 1 according to the invention comprises a housing 2, in which at least one inner bottom 3 and at least two inner tubes, namely a first inner tube 4 and a second inner tube 5, are arranged.
  • the silencer 1 is here without restriction of the generality as a silencer 1 for an exhaust system of an internal combustion engine, preferably in a motor vehicle, designed. In principle, however, the silencer 1 can be provided for any other gas and airborne sounding line.
  • the inner bottom 3 is used to stiffen the housing 2. It is clear that the housing 2 can in principle also be equipped with more than one inner bottom 3.
  • the inner tubes 4, 5 serve to guide gas in the interior of the housing 2, that is to say in particular for the exhaust gas routing. This means that the muffler 1 at least within its inner tubes 4, 5 of the Airborne transporting gas is flowed through. It is also clear here that the muffler 1 can basically have more than two inner tubes.
  • the muffler 1 can be configured in the usual way as an absorption muffler and accordingly contain absorption materials. Furthermore, the silencer 1 can work with resonance effects and / or with reflections in order to dampen the airborne sound entrained in the gas.
  • the two inner tubes 4, 5 are inserted axially into one another in a sliding seat region 6 characterized by a brace, such that they are axially movable relative to one another.
  • the inner tubes 4, 5 in the sliding seat region 6 radial play 7, that is, the two inner tubes 4, 5 are radially spaced from each other in the sliding seat portion 6.
  • the two inner tubes 4, 5 pass through the inner bottom 3 in the sliding seat region 6. Furthermore, both inner tubes 4, 5 are each fastened to this one common inner bottom 3.
  • the inner bottom 3 according to the Fig. 1 and 2 at least a first tongue 8.
  • two first tongues 8 are provided, which are diametrically opposed.
  • the first tongues 8 are resilient and in each case in the sliding seat region 6 fixedly connected to the first inner tube 4.
  • the first tongues 8 are soldered or welded to the outside of the first inner tube 4.
  • the inner bottom 3 also has at least one second tongue 9.
  • two second tongues 9 are provided, which are diametrically opposite.
  • the first tongues 8 and the second tongues 9 are aligned perpendicular to each other, that is, offset by 90 ° to each other.
  • the second tongues 9 are fixedly connected to the second inner tube 5 and also designed resiliently. It is essential that the second tongues 9 are resiliently movable substantially independently of the first tongues 8. This can be done by a corresponding configuration, in particular with regard to positioning, shaping and dimensioning.
  • the first inner tube 4 can expand axially.
  • This axial movement of the first inner tube 4 is not critical with respect to the second inner tube 5, since the sliding seat region 6 permits an axial adjustment of the two inner tubes 4, 5 relative to one another.
  • the axial adjustment of the first inner tube 4 is likewise not critical, since the first tongues 8 can elastically follow the axial movement of the first inner tube 4 due to their spring elasticity.
  • the spring elasticity of the relatively short first tongues 8 is realized here by the elasticity of the inner bottom 3, on which the first tongues 8 are arranged or formed. The inner bottom 3 is thereby bumped reversible.
  • the length of the second inner tube 5 may also change. Due to the axial mobility relative to the first inner tube 4 in the sliding seat region 6, no tension with the first inner tube 4 can arise. With regard to the inner bottom 3, the changes in length of the second inner tube 5 are also not critical, since the second tongues 9 can follow this axial movements of the second inner tube 5 elastically due to their spring elasticity.
  • the spring elasticity of the second tongues 9 is realized here by a comparatively large length of the second tongues 9. In that regard, it comes with an elastic bending of the second tongues 9 not or only slightly to a bending of the inner bottom 2. In this way disturbing interactions in the elastic yielding of the tongues 8, 9 can be avoided. In that regard, the tongues 8 and 9 are independent of each other resiliently movable.
  • At least the first tongues 8 or at least the second tongues 8, but preferably all the tongues 8, 9 are integrally formed on the inner bottom 3. This is achieved, for example, by free cutting or free punching of the tongues 8, 9 on the inner bottom 3. Alternatively, it would in principle be possible to produce the first tongues 8 and / or the second tongues 9 separately from the inner bottom 3 and then fasten them to the inner bottom 3.
  • the inner bottom 3 extends substantially in a first plane 10.
  • the arrangement of the first tongues 8 is expedient here so that they also extend in the first plane 10.
  • the first tongues 8 are also secured at their free ends 11 substantially in the first plane 10 on the first inner tube 4.
  • the fixing of the first tongues 8 takes place at a free end 12 of the first inner tube 4, that is to say in the sliding seat region 6.
  • the first tongues 8 are thus elastically movable perpendicular to the first plane 10.
  • the second tongues 9 are fastened at their free ends 13 in a second plane 14, which is at a distance from the first plane 10 and runs parallel thereto, on the second inner tube 5.
  • the fixing of the second tongues 9 on the second inner tube 5 also takes place in the region of a free end 15 of the second inner tube 5, ie in the sliding seat region 6.
  • the second tongues 9 each have a substantially rectilinear section 16 which defines the respective free end 13 and extends substantially in the second plane 14.
  • the second tongues 9 are each provided with an angled portion 17, which is angled at one end to the rectilinear portion 16 and the other end is angled from the inner bottom 3. Accordingly, the second tongues 9 are angled at their fixed ends 18 from the inner bottom 3.
  • the second tongues 9 are thus movable elastically perpendicular to the second plane 14.
  • Fig. 1 can be seen, in particular, care is taken during punching or free cutting of the tongues 8, 9 that a resilient yielding of the respective tongues 8, 9 triggers the lowest possible stresses in the inner bottom 3, so that in particular cracking can be avoided.

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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)
  • Surgical Instruments (AREA)

Abstract

The muffler has housing with an inner plate (3) to reinforce the housing and two inner pipes to carry exhaust gas into the housing. The pipes are supported on the housing independent of one another. Two elastic tongues (8, 9) are provided on the plate, where the tongue (9) is connected to one pipe and moves elastically independent of the tongue (8). The tongues are formed through free cuttings or free pressings at the inner plate.

Description

Die vorliegende Erfindung betrifft einen Schalldämpfer für eine Gas und Luftschall transportierende Leitung, insbesondere für eine Abgasanlage einer Brennkraftmaschine, vorzugsweise in einem Kraftfahrzeug.The present invention relates to a silencer for a gas and airborne sounding conduit, in particular for an exhaust system of an internal combustion engine, preferably in a motor vehicle.

Um bei einer gasführenden Leitung, deren Gasströmung Luftschall transportiert, eine Schallemission in die Umgebung zu reduzieren, ist es üblich, in diese Leitung einen Schalldämpfer der eingangs genannten Art einzusetzen. Der Schalldämpfer wird dabei von dem in der Leitung transportierten Gas durchströmt. Gleichzeitig tritt mit dem Gas auch der mitgeführte Luftschall in den Schalldämpfer ein und wird darin, beispielsweise mittels Reflexionen, Resonanzen und schallabsorbierenden Materialien bedämpft. Das Gas strömt dann mit einem reduzierten Luftschallpegel aus dem Schalldämpfer wieder aus. Vorzugsweise kommen derartige Schalldämpfer bei Abgasanlagen vom Brennkraftmaschinen, insbesondere bei Kraftfahrzeugen, zur Anwendung, um den von der Brennkraftmaschine erzeugten Schall, der sich durch die Abgasanlage ausbreitet, zu bedämpfen. Ebenso ist es grundsätzlich möglich, in einer Frischluftanlage einer Brennkraftmaschine einen Schalldämpfer anzuordnen, um beispielsweise den von einem Verdichter eines Abgasturboladers erzeugten Schall zu dämpfen. Die Bedämpfung von Luftschall kann jedoch auch bei anderen gasführenden Leitungen von Interesse sein, so dass die vorliegende Erfindung grundsätzlich nicht auf Anwendungen bei Brennkraftmaschinen eingeschränkt sein soll.In order to reduce a noise emission into the environment in the case of a gas-carrying line, whose gas flow conveys airborne sound, it is customary to use a silencer of the type mentioned in the introduction. The muffler is flowed through by the gas transported in the line. At the same time, the entrained airborne sound enters the muffler with the gas and is attenuated therein, for example by means of reflections, resonances and sound-absorbing materials. The gas then flows out of the muffler at a reduced airborne sound level. Such mufflers are preferably used in exhaust systems of the internal combustion engine, in particular in motor vehicles, in order to dampen the sound generated by the internal combustion engine which propagates through the exhaust system. Likewise, it is basically possible in a fresh air system of an internal combustion engine To arrange a muffler, for example, to dampen the sound generated by a compressor of an exhaust gas turbocharger. The attenuation of airborne sound, however, may also be of interest in other gas-carrying lines, so that the present invention should in principle not be restricted to applications in internal combustion engines.

Sofern die Leitung, in welcher die Schallausbreitung bedämpft werden soll, Heißgase transportiert, wie beispielsweise bei einer Abgasanlage einer Brennkraftmaschine, kommt es zwangsläufig zu thermischen Ausdehnungseffekten. Um hierbei Beschädigungen im Schalldämpfer zu vermeiden, ist es üblich, Innenrohre, die im Inneren eines Gehäuses des Schalldämpfers verlaufen und die Gase führen, so ineinander zu stecken, dass sie relativ zueinander axial beweglich sind und dadurch einen Schiebesitz ausbilden. Thermisch bedingte Ausdehnungseffekte können dadurch in einem solchen Schiebesitz kompensiert werden, da die beiden Innenrohre in diesem Schiebesitz axial zueinander beweglich sind. Des Weiteren ist es üblich, das Gehäuse eines derartigen Schalldämpfers durch wenigstens einen Innenboden auszusteifen, siehe zum Beispiel US 5 581 056 . Je nach Gasführung im Inneren des Schalldämpfers müssen die Innenrohre durch einen solchen Innenboden hindurchgeführt werden. Gleichzeitig werden derartige Innenböden dazu genutzt, die Innenrohre im Gehäuse zu fixieren. Dabei ist es üblich, in der Nähe des Schiebesitzes das eine Innenrohr an einem ersten Innenboden zu befestigen und das andere Innenrohr an einem zweiten Innenboden zu befestigen, der vom ersten Innenboden beabstandet ist. Die beiden Innenböden sind dann beiderseits des Schiebesitzes angeordnet. Um die Innenrohre möglichst effektiv im Gehäuse zu stabilisieren, ist es dabei zweckmäßig, die beiden Innenrohre möglichst nahe am Schiebesitz über die beiden Innenböden abzustützen. Da hierdurch die beiden Innenböden nur einen vergleichsweise geringen Abstand voneinander aufweisen, besitzt das Gehäuse in diesem Bereich eine besonders hohe Steifigkeit. Allerdings ist das Einbringen eines derartigen Innenbodens zumindest bei Serienprodukten mit vergleichsweise hohen Kosten verbunden. Außerdem erhöht sich dadurch das Gewicht des Schalldämpfers.If the line in which the sound propagation is to be damped, transported hot gases, such as in an exhaust system of an internal combustion engine, it inevitably leads to thermal expansion effects. In order to avoid damage in the muffler, it is customary inner tubes that run inside a housing of the muffler and lead the gases into each other so that they are axially movable relative to each other and thereby form a sliding seat. Thermally induced expansion effects can be compensated in such a sliding seat, since the two inner tubes are axially movable relative to each other in this sliding seat. Furthermore, it is customary to stiffen the housing of such a silencer by at least one inner bottom, see for example US 5 581 056 , Depending on the gas flow inside the silencer, the inner tubes must be passed through such an inner bottom. At the same time, such inner floors are used to fix the inner tubes in the housing. It is customary in the vicinity of the sliding seat to attach the one inner tube to a first inner bottom and to attach the other inner tube to a second inner bottom, which is spaced from the first inner bottom. The two inner floors are then on both sides arranged the sliding seat. In order to stabilize the inner tubes as effectively as possible in the housing, it is expedient to support the two inner tubes as close as possible to the sliding seat on the two inner floors. As a result, the two inner floors have only a comparatively small distance from each other, the housing has a particularly high rigidity in this area. However, the introduction of such an inner bottom, at least for series products associated with relatively high costs. In addition, this increases the weight of the muffler.

Die vorliegende Erfindung beschäftigt sich mit dem Problem, für einen Schalldämpfer der eingangs genannten Art eine verbesserte Ausführungsform anzugeben, die sich insbesondere durch ein reduziertes Gewicht und einen preiswerten Aufbau auszeichnet.The present invention is concerned with the problem of providing a muffler of the type mentioned an improved embodiment, which is characterized in particular by a reduced weight and a low-cost structure.

Erfindungsgemäß wird dieses Problem durch den Gegenstand des unabhängigen Anspruchs gelöst. Vorteilhafte Ausführungsformen sind Gegenstand der abhängigen Ansprüche.According to the invention, 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, beide Innenrohre an ein- und demselben Innenboden zu befestigen und hierzu an diesem Innenboden zumindest eine an dem einen Innenrohr befestigte federelastische erste Zunge sowie wenigstens eine am anderen Innenrohr befestigte, federelastische zweite Zunge auszubilden, die unabhängig von der wenigstens einen ersten Zunge federelastisch beweglich ist. Durch diese Bauweise können die federelastischen Zungen den thermisch bedingten Längenänderungen der Innenrohre unabhängig voneinander folgen, ohne dass es dabei zu unzulässig hohen Spannungen innerhalb des Innenbodens kommt. Besonderer Vorteil der vorliegenden Erfindung ist, dass ein kompletter Innenboden entfallen kann, was eine große Kosteneinsparung und eine Gewichtsreduzierung mit sich bringt. Die Erfindung nutzt dabei die Erkenntnis, dass sich in dem auszusteifenden Bereich des Gehäuses eine hinreichende Aussteifung bereits mit einem einzigen Innenboden erzielen lässt, so dass ein zweiter Innenboden zumindest hinsichtlich der Aussteifung des Gehäuses in diesem Gehäuseabschnitt nicht erforderlich ist. Wichtig ist für die Erfindung außerdem, dass beide Innenrohre im Bereich des Schiebesitzes unabhängig voneinander über den einen gemeinsamen Innenboden am Gehäuse abgestützt sind, wodurch sich eine stabile und lagefixierte Positionierung für beide Innenrohre im Gehäuse ergibt.The invention is based on the general idea to attach both inner tubes to one and the same inner bottom and to form at this inner bottom at least one attached to the one inner tube resilient first tongue and at least one attached to the other inner tube, resilient second tongue, which is independent of the at least a first tongue is resiliently movable. Due to this design, the resilient tongues can thermally Conditional changes in length of the inner tubes follow independently, without causing unacceptably high stresses within the inner bottom. A particular advantage of the present invention is that a complete inner bottom can be omitted, which brings a great cost saving and weight reduction. The invention uses the knowledge that in the auszusteifenden area of the housing sufficient stiffening can be achieved with a single inner bottom, so that a second inner bottom is not required, at least in terms of stiffening of the housing in this housing section. It is also important for the invention that both inner tubes are supported in the region of the sliding seat independently of each other via the one common inner bottom of the housing, resulting in a stable and positionally fixed positioning for both inner tubes in the housing.

Gemäß einer vorteilhaften Ausführungsform können die Zungen durch Freischneiden oder Freistanzen am Innenboden ausgebildet sein. Auf diese Weise können die Zungen besonders einfach und preiswert hergestellt werden. Die Zungen sind dabei in den Innenboden integriert bzw. bilden mit dem Innenboden ein integrales Bauteil. Diese Integralbauweise hat den Vorteil, dass keine separat hergestellten Zungen mit zusätzlichem Arbeitsaufwand am Innenboden befestigt werden müssen.According to an advantageous embodiment, the tongues may be formed by free cutting or free punching on the inner bottom. In this way, the tongues can be made particularly simple and inexpensive. The tongues are integrated into the inner floor or form an integral component with the inner bottom. This integral construction has the advantage that no separately produced tongues need to be attached to the inner bottom with additional work.

Bei einer anderen vorteilhaften Ausführungsform können die Innenrohre im Schiebesitzbereich radial voneinander beabstandet sein. Das heißt, die Innenrohre besitzen im Schiebesitz Radialspiel und berühren sich nicht. Ein derartiger Schiebesitz ist zwangsläufig undicht, was jedoch je nach Strömungsführung im Schalldämpfer unschädlich ist. Vorteilhaft ist bei diesem berührungslosen Schiebesitz, dass insbesondere eine Verspannung der beiden Innenrohre miteinander im Schiebesitz aufgrund thermisch bedingter radialer Ausdehnungen vermieden werden können, so dass die axiale Beweglichkeit der beiden Innenrohre im Schiebesitz dementsprechend gewährleistet ist.In another advantageous embodiment, the inner tubes may be radially spaced apart in the sliding seat region. That is, the inner tubes have in the Sliding seat radial play and do not touch. Such a sliding seat is inevitably leaking, but this is harmless depending on the flow in the silencer. It is advantageous in this non-contact sliding seat that in particular a tension of the two inner tubes can be avoided in the sliding seat due to thermally induced radial expansions, so that the axial mobility of the two inner tubes is ensured in the sliding seat accordingly.

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, wie sie in den beigefügten Ansprüchen beansprucht ist.It is understood that the features mentioned above and those yet to be explained not only in the particular combination given, but also in other combinations or alone, without departing from the scope of the present invention, as claimed in the appended claims is.

Ein bevorzugtes Ausführungsbeispiel der Erfindung ist in den Zeichnungen dargestellt und wird in der nachfolgenden Beschreibung näher erläutert, wobei sich gleiche Bezugszeichen auf gleiche oder funktional gleiche oder ähnliche Bauteile beziehen.A preferred embodiment of the invention is illustrated in the drawings and will be explained in more detail in the following description, wherein like reference numerals refer to identical or functionally identical or similar components.

Es zeigen, jeweils schematisch,

Fig. 1
einen Querschnitt durch einen Schalldämpfer nach der Erfindung im Bereich eines Innenbodens, wobei jedoch zur vereinfachten Darstellung Innenrohre weggelassen sind,
Fig. 2
einen Längsschnitt entsprechend den Schnittlinien II in Fig. 1 in einem Schiebesitzbereich der Innenrohre,
Fig. 3
einen Längsschnitt entsprechend den Schnittlinien III in Fig. 1 durch den Schiebesitzbereich.
Show, in each case schematically,
Fig. 1
a cross section through a muffler according to the invention in the region of an inner bottom, but with the inner tube omitted for the sake of simplicity,
Fig. 2
a longitudinal section corresponding to the section lines II in Fig. 1 in a sliding seat area of the inner tubes,
Fig. 3
a longitudinal section corresponding to the section lines III in Fig. 1 through the sliding seat area.

Entsprechend den Fig. 1 bis 3 umfasst ein erfindungsgemäßer Schalldämpfer 1 ein Gehäuse 2, in dem wenigstens ein Innenboden 3 sowie wenigstens zwei Innenrohre, nämlich ein erstes Innenrohr 4 und ein zweites Innenrohr 5, angeordnet sind. Der Schalldämpfer 1 ist hier ohne Beschränkung der Allgemeinheit als Schalldämpfer 1 für eine Abgasanlage einer Brennkraftmaschine, vorzugsweise in einem Kraftfahrzeug, ausgestaltet. Grundsätzlich kann der Schalldämpfer 1 jedoch für eine beliebige andere Gas und Luftschall transportierende Leitung vorgesehen sein.According to the Fig. 1 to 3 a muffler 1 according to the invention comprises a housing 2, in which at least one inner bottom 3 and at least two inner tubes, namely a first inner tube 4 and a second inner tube 5, are arranged. The silencer 1 is here without restriction of the generality as a silencer 1 for an exhaust system of an internal combustion engine, preferably in a motor vehicle, designed. In principle, however, the silencer 1 can be provided for any other gas and airborne sounding line.

Der Innenboden 3 dient zur Aussteifung des Gehäuses 2. Es ist klar, dass das Gehäuse 2 grundsätzlich auch mit mehr als einem Innenboden 3 ausgestattet sein kann. Die Innenrohre 4, 5 dienen zur Gasführung im Inneren des Gehäuses 2, also insbesondere zur Abgasführung. Das heißt, dass der Schalldämpfer 1 zumindest innerhalb seiner Innenrohre 4, 5 von dem den Luftschall transportierenden Gas durchströmt ist. Dabei ist auch hier klar, dass der Schalldämpfer 1 grundsätzlich auch mehr als zwei Innenrohre aufweisen kann. Der Schalldämpfer 1 kann dabei in üblicher Weise als Absorptionsschalldämpfer ausgestaltet sein und dementsprechend Absorptionsmaterialien enthalten. Des Weiteren kann der Schalldämpfer 1 mit Resonanzeffekten und/oder mit Reflektionen arbeiten, um den im Gas mitgeführten Luftschall zu bedämpfen.The inner bottom 3 is used to stiffen the housing 2. It is clear that the housing 2 can in principle also be equipped with more than one inner bottom 3. The inner tubes 4, 5 serve to guide gas in the interior of the housing 2, that is to say in particular for the exhaust gas routing. This means that the muffler 1 at least within its inner tubes 4, 5 of the Airborne transporting gas is flowed through. It is also clear here that the muffler 1 can basically have more than two inner tubes. The muffler 1 can be configured in the usual way as an absorption muffler and accordingly contain absorption materials. Furthermore, the silencer 1 can work with resonance effects and / or with reflections in order to dampen the airborne sound entrained in the gas.

Entsprechend den Fig. 2 und 3 sind die beiden Innenrohre 4, 5 in einem durch eine geschweifte Klammer gekennzeichneten Schiebesitzbereich 6 axial ineinander gesteckt, derart, dass sie relativ zueinander axial beweglich sind. Bei der hier gezeigten speziellen Ausführungsform besitzen die Innenrohre 4, 5 im Schiebesitzbereich 6 Radialspiel 7, das heißt, die beiden Innenrohre 4, 5 sind im Schiebesitzbereich 6 radial voneinander beabstandet.According to the Fig. 2 and 3 the two inner tubes 4, 5 are inserted axially into one another in a sliding seat region 6 characterized by a brace, such that they are axially movable relative to one another. In the specific embodiment shown here, the inner tubes 4, 5 in the sliding seat region 6 radial play 7, that is, the two inner tubes 4, 5 are radially spaced from each other in the sliding seat portion 6.

Die beiden Innenrohre 4, 5 durchsetzen den Innenboden 3 im Schiebesitzbereich 6. Des Weiteren sind beide Innenrohre 4, 5 jeweils für sich an diesem einen gemeinsamen Innenboden 3 befestigt. Hierzu weist der Innenboden 3 gemäß den Fig. 1 und 2 zumindest eine erste Zunge 8 auf. Im vorliegenden Ausführungsbeispiel sind zwei erste Zungen 8 vorgesehen, die sich diametral gegenüberliegen. Die ersten Zungen 8 sind federelastisch ausgestaltet und jeweils im Schiebesitzbereich 6 fest mit dem ersten Innenrohr 4 verbunden. Beispielsweise sind die ersten Zungen 8 außen an das erste Innenrohr 4 angelötet oder angeschweißt.The two inner tubes 4, 5 pass through the inner bottom 3 in the sliding seat region 6. Furthermore, both inner tubes 4, 5 are each fastened to this one common inner bottom 3. For this purpose, the inner bottom 3 according to the Fig. 1 and 2 at least a first tongue 8. In the present embodiment, two first tongues 8 are provided, which are diametrically opposed. The first tongues 8 are resilient and in each case in the sliding seat region 6 fixedly connected to the first inner tube 4. For example, the first tongues 8 are soldered or welded to the outside of the first inner tube 4.

Entsprechend den Fig. 1 und 3 weist der Innenboden 3 außerdem zumindest eine zweite Zunge 9 auf. Im vorliegenden, bevorzugten Ausführungsbeispiel sind zwei zweite Zungen 9 vorgesehen, die sich diametral gegenüber liegen. Zweckmäßig sind die ersten Zungen 8 und die zweiten Zungen 9 senkrecht zueinander ausgerichtet, das heißt um 90° zueinander versetzt angeordnet. Die zweiten Zungen 9 sind fest mit dem zweiten Innenrohr 5 verbunden und ebenfalls federelastisch ausgestaltet. Wesentlich ist, dass die zweiten Zungen 9 im wesentlichen unabhängig von den ersten Zungen 8 federelastisch beweglich sind. Dies kann durch eine entsprechende Ausgestaltung, insbesondere hinsichtlich Positionierung, Formgebung und Dimensionierung erfolgen.According to the Fig. 1 and 3 the inner bottom 3 also has at least one second tongue 9. In the present preferred embodiment, two second tongues 9 are provided, which are diametrically opposite. Appropriately, the first tongues 8 and the second tongues 9 are aligned perpendicular to each other, that is, offset by 90 ° to each other. The second tongues 9 are fixedly connected to the second inner tube 5 and also designed resiliently. It is essential that the second tongues 9 are resiliently movable substantially independently of the first tongues 8. This can be done by a corresponding configuration, in particular with regard to positioning, shaping and dimensioning.

Bei thermisch bedingten Ausdehnungseffekten kann sich das erste Innenrohr 4 axial ausdehnen. Diese Axialbewegung des ersten Innenrohrs 4 ist hinsichtlich des zweiten Innenrohrs 5 unkritisch, da der Schiebesitzbereich 6 eine Axialverstellung der beiden Innenrohre 4, 5 relativ zueinander zulässt. Im Hinblick auf den Innenboden 3 ist die Axialverstellung des ersten Innenrohrs 4 ebenfalls unkritisch, da die ersten Zungen 8 aufgrund ihrer Federelastizität der Axialbewegung des ersten Innenrohrs 4 elastisch folgen können. Die Federelastizität der relativ kurzen ersten Zungen 8 wird hierbei durch die Elastizität des Innenbodens 3 realisiert, an dem die ersten Zungen 8 angeordnet bzw. ausgebildet sind. Der Innenboden 3 wird dadurch reversibel gebeult.In thermally induced expansion effects, the first inner tube 4 can expand axially. This axial movement of the first inner tube 4 is not critical with respect to the second inner tube 5, since the sliding seat region 6 permits an axial adjustment of the two inner tubes 4, 5 relative to one another. With regard to the inner bottom 3, the axial adjustment of the first inner tube 4 is likewise not critical, since the first tongues 8 can elastically follow the axial movement of the first inner tube 4 due to their spring elasticity. The spring elasticity of the relatively short first tongues 8 is realized here by the elasticity of the inner bottom 3, on which the first tongues 8 are arranged or formed. The inner bottom 3 is thereby bumped reversible.

Entsprechendes gilt auch für thermische Ausdehnungen des zweiten Innenrohrs 5. Thermisch bedingt kann sich die Länge des zweiten Innenrohrs 5 ebenfalls ändern. Durch die axiale Beweglichkeit gegenüber dem ersten Innenrohr 4 im Schiebesitzbereich 6 können dabei keine Verspannungen mit dem ersten Innenrohr 4 entstehen. Im Hinblick auf den Innenboden 3 sind die Längenänderungen des zweiten Innenrohrs 5 ebenfalls unkritisch, da die zweiten Zungen 9 aufgrund ihrer Federelastizität diesen Axialbewegungen des zweiten Innenrohrs 5 elastisch folgen können. Die Federelastizität der zweiten Zungen 9 wird hier durch eine vergleichsweise große Länge der zweiten Zungen 9 realisiert. Insoweit kommt es bei einer elastischen Verbiegung der zweiten Zungen 9 nicht oder nur geringfügig zu einer Verbiegung des Innenbodens 2. Auf diese Weise können störende Wechselwirkungen beim elastischen Nachgeben der Zungen 8, 9 vermieden werden. Insoweit sind die Zungen 8 und 9 unabhängig voneinander federelastisch beweglich.The same applies to thermal expansion of the second inner tube 5. Due to thermal reasons, the length of the second inner tube 5 may also change. Due to the axial mobility relative to the first inner tube 4 in the sliding seat region 6, no tension with the first inner tube 4 can arise. With regard to the inner bottom 3, the changes in length of the second inner tube 5 are also not critical, since the second tongues 9 can follow this axial movements of the second inner tube 5 elastically due to their spring elasticity. The spring elasticity of the second tongues 9 is realized here by a comparatively large length of the second tongues 9. In that regard, it comes with an elastic bending of the second tongues 9 not or only slightly to a bending of the inner bottom 2. In this way disturbing interactions in the elastic yielding of the tongues 8, 9 can be avoided. In that regard, the tongues 8 and 9 are independent of each other resiliently movable.

Zweckmäßig sind zumindest die ersten Zungen 8 oder zumindest die zweiten Zungen 8, jedoch vorzugsweise alle Zungen 8, 9 integral am Innenboden 3 ausgebildet. Erreicht wird dies beispielsweise durch Freischneiden oder Freistanzen der Zungen 8, 9 am Innenboden 3. Alternativ wäre es grundsätzlich möglich, die ersten Zungen 8 und/oder die zweiten Zungen 9 separat vom Innenboden 3 herzustellen und anschließend am Innenboden 3 zu befestigen.Suitably, at least the first tongues 8 or at least the second tongues 8, but preferably all the tongues 8, 9 are integrally formed on the inner bottom 3. This is achieved, for example, by free cutting or free punching of the tongues 8, 9 on the inner bottom 3. Alternatively, it would in principle be possible to produce the first tongues 8 and / or the second tongues 9 separately from the inner bottom 3 and then fasten them to the inner bottom 3.

Entsprechend den Fig. 2 und 3 erstreckt sich der Innenboden 3 im wesentlichen in einer ersten Ebene 10. Die Anordnung der ersten Zungen 8 erfolgt hier zweckmäßig so, dass sie sich ebenfalls in der ersten Ebene 10 erstrecken. Gleichzeitig ergibt sich dadurch, dass die ersten Zungen 8 an ihren freien Enden 11 ebenfalls im wesentlichen in der ersten Ebene 10 am ersten Innenrohr 4 befestigt sind. Dabei erfolgt die Fixierung der ersten Zungen 8 an einem freien Ende 12 des ersten Innenrohrs 4, also im Schiebesitzbereich 6. Die ersten Zungen 8 sind somit senkrecht zur ersten Ebene 10 federelastisch beweglich.According to the Fig. 2 and 3 the inner bottom 3 extends substantially in a first plane 10. The arrangement of the first tongues 8 is expedient here so that they also extend in the first plane 10. At the same time results from the fact that the first tongues 8 are also secured at their free ends 11 substantially in the first plane 10 on the first inner tube 4. In this case, the fixing of the first tongues 8 takes place at a free end 12 of the first inner tube 4, that is to say in the sliding seat region 6. The first tongues 8 are thus elastically movable perpendicular to the first plane 10.

Im Unterschied dazu sind die zweiten Zungen 9 an ihren freien Enden 13 in einer von der ersten Ebene 10 beabstandeten und parallel dazu verlaufenden zweiten Ebene 14 am zweiten Innenrohr 5 befestigt. Die Fixierung der zweiten Zungen 9 am zweiten Innenrohr 5 erfolgt dabei ebenfalls im Bereich eines freien Endes 15 des zweiten Innenrohrs 5, also im Schiebesitzbereich 6. Des Weiteren weisen die zweiten Zungen 9 jeweils einen im wesentlichen geradlinigen Abschnitt 16 auf, der das jeweilige freie Ende 13 aufweist und sich im wesentlichen in der zweiten Ebene 14 erstreckt. Außerdem sind die zweiten Zungen 9 jeweils mit einem abgewinkelten Abschnitt 17 ausgestattet, der einenends zum geradlinigen Abschnitt 16 abgewinkelt ist und anderenends vom Innenboden 3 abgewinkelt ist. Dementsprechend sind die zweiten Zungen 9 an ihren festen Enden 18 vom Innenboden 3 abgewinkelt. Die zweiten Zungen 9 sind somit senkrecht zur zweiten Ebene 14 federelastisch beweglich.In contrast, the second tongues 9 are fastened at their free ends 13 in a second plane 14, which is at a distance from the first plane 10 and runs parallel thereto, on the second inner tube 5. The fixing of the second tongues 9 on the second inner tube 5 also takes place in the region of a free end 15 of the second inner tube 5, ie in the sliding seat region 6. Furthermore, the second tongues 9 each have a substantially rectilinear section 16 which defines the respective free end 13 and extends substantially in the second plane 14. In addition, the second tongues 9 are each provided with an angled portion 17, which is angled at one end to the rectilinear portion 16 and the other end is angled from the inner bottom 3. Accordingly, the second tongues 9 are angled at their fixed ends 18 from the inner bottom 3. The second tongues 9 are thus movable elastically perpendicular to the second plane 14.

Wesentlich für die Anbindung der Zungen 8, 9 an den Innenrohren 4, 5 ist, dass durch diese Anbindungen die axiale Beweglichkeit der beiden Innenrohre 4, 5 im Schiebesitzbereich 6 nicht behindert wird. Insbesondere ist z. B. mit Bezug auf Fig. 3 darauf zu achten, dass zwischen dem freien Ende 12 des ersten Innenrohrs 4 und den zweiten Zungen 9 ein hinreichend großer axialer Abstand 19 vorgesehen ist, der auch bei extremen Längendehnungen der beiden Innenrohre 4, 5 eine axiale Kollision zwischen dem freien Ende 12 des ersten Innenrohrs 4 und den zweiten Zungen 9 vermeiden hilft. Dementsprechend sind insbesondere die beiden Ebenen 10 und 14, die parallel zueinander verlaufen, voneinander beabstandet.Essential for the connection of the tongues 8, 9 to the inner tubes 4, 5 is that the axial mobility of the two inner tubes 4, 5 in the sliding seat area 6 is not hindered by these connections. In particular, z. With respect to Fig. 3 make sure that between the free end 12 of the first inner tube 4 and the second tongues 9, a sufficiently large axial distance 19 is provided, even at extreme elongations of the two inner tubes 4, 5, an axial collision between the free end 12 of the first inner tube 4 and the second tongues 9 helps avoid. Accordingly, in particular, the two planes 10 and 14 which are parallel to each other, spaced from each other.

Wie Fig. 1 zu entnehmen ist, wird beim Ausstanzen bzw. Freischneiden der Zungen 8, 9 insbesondere darauf geachtet, dass ein federelastisches Nachgeben der jeweiligen Zungen 8, 9 möglichst geringe Spannungen im Innenboden 3 auslöst, so dass insbesondere eine Rissbildung vermieden werden kann.As Fig. 1 can be seen, in particular, care is taken during punching or free cutting of the tongues 8, 9 that a resilient yielding of the respective tongues 8, 9 triggers the lowest possible stresses in the inner bottom 3, so that in particular cracking can be avoided.

Claims (9)

  1. A muffler for a line conveying gas and airborne sound, in particular for an exhaust system of an internal combustion engine, preferably in a motor vehicle,
    - with a housing (2) in which at least two inside pipes (4, 5) are arranged for carrying gas in the interior of the housing (2) and which has at least one inside bottom (3) for reinforcing the housing (2),
    - wherein the two inside pipes (4, 5) are inserted one inside the other in a sliding seat area (6) and are movable axially relative to one another,
    - wherein the two inside pipes (4, 5) pass through the inside bottom (3) in the sliding seat area (6),
    - wherein the inside bottom (3) has at least one first elastic tongue (8) which is fixedly connected to the one inside pipe (4),
    characterized in that
    - the inside bottom (3) also has at least one elastic second tongue (9) which is fixedly connected to the other inside pipe (5) and which is elastically movable independently of the at least one first tongue (8).
  2. The muffler according to Claim 1,
    characterized in that
    the tongues (8, 9) are formed by free-cutting or free-stamping on the inside bottom (3).
  3. The muffler according Claim 1 or 2,
    characterized in that
    the at least one second tongue (9) is angled away from the inside bottom (3) on its fixed end (18).
  4. The muffler according to any one of Claims 1 to 3,
    characterized in that
    the at least one second tongue (9) is attached to the other inside pipe (5) on its free end (13) in a second plane (14) which is a distance away from the first plane (10) in which the inside bottom (3) extends.
  5. The muffler according to Claim 4,
    characterized in that
    the at least one second tongue (9) has a linear section (16), which comprises the free end (13) and extends essentially in the second plane (14).
  6. The muffler according to any one of Claims 1 to 5,
    characterized in that
    the at least one first tongue (8) is attached to the one inside pipe (4) on its free end (11) in a first plane (10) in which the inside bottom (3) extends.
  7. The muffler according to any one of Claims 1 to 6,
    characterized in that
    the at least one first tongue (8) extends essentially in a first plane (10) in which the inside bottom (3) also extends.
  8. The muffler according to any one of Claims 1 to 7,
    characterized in that
    - two diametrically opposite first tongues (8) are provided, or
    - two diametrically opposite second tongues (9) are provided, or
    - two diametrically opposite first tongues (8) are provided, with two diametrically opposite second tongues (9) provided in between.
  9. The muffler according to any one of Claims 1 to 8,
    characterized in that
    the inside pipes (4, 5) are spaced a distance apart radially in the sliding seat area (6).
EP05108715A 2004-11-10 2005-09-21 Silencer Active EP1657414B1 (en)

Applications Claiming Priority (1)

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DE102004054441A DE102004054441B4 (en) 2004-11-10 2004-11-10 silencer

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EP1657414A1 EP1657414A1 (en) 2006-05-17
EP1657414B1 true EP1657414B1 (en) 2008-08-13

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Also Published As

Publication number Publication date
ATE404783T1 (en) 2008-08-15
US20060096805A1 (en) 2006-05-11
US7434658B2 (en) 2008-10-14
DE102004054441A1 (en) 2006-05-18
EP1657414A1 (en) 2006-05-17
DE102004054441B4 (en) 2006-08-03
DE502005005008D1 (en) 2008-09-25

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