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EP2362076A2 - Sound absorber - Google Patents

Sound absorber Download PDF

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Publication number
EP2362076A2
EP2362076A2 EP11150812A EP11150812A EP2362076A2 EP 2362076 A2 EP2362076 A2 EP 2362076A2 EP 11150812 A EP11150812 A EP 11150812A EP 11150812 A EP11150812 A EP 11150812A EP 2362076 A2 EP2362076 A2 EP 2362076A2
Authority
EP
European Patent Office
Prior art keywords
tube
outlet
deflecting
housing
flow
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP11150812A
Other languages
German (de)
French (fr)
Other versions
EP2362076B1 (en
EP2362076A3 (en
Inventor
Peter Gorke
Michael Pommerer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eberspaecher Exhaust Technology GmbH and Co KG
Original Assignee
J Eberspaecher GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by J Eberspaecher GmbH and Co KG filed Critical J Eberspaecher GmbH and Co KG
Publication of EP2362076A2 publication Critical patent/EP2362076A2/en
Publication of EP2362076A3 publication Critical patent/EP2362076A3/en
Application granted granted Critical
Publication of EP2362076B1 publication Critical patent/EP2362076B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F01N1/084—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling the gases flowing through the silencer two or more times longitudinally in opposite directions, e.g. using parallel or concentric tubes

Definitions

  • the present invention relates to a silencer, in particular a rear silencer, for an exhaust system of an internal combustion engine, in particular of a motor vehicle.
  • a so-called rear silencer In an exhaust system, a so-called rear silencer is usually located in an exit-side end section of the exhaust system. A leading out of the rear silencer outlet pipe usually forms a so-called tail pipe or is connected to such a tail pipe.
  • the tailpipe has the open mouth of the exhaust system to the environment.
  • a silencer includes a housing in which there is an exit space from which said exit pipe leads out.
  • it is customary to perform the outlet pipe of the rear silencer and the tailpipe comparatively long. This comparatively much space is needed. Especially with smaller vehicles, only a small amount of space is available.
  • the use of outlet pipes or tailpipes of great length is of particular importance for smaller internal combustion engines with, for example, three or four cylinders, especially if the overall soundproofing is to be realized with less space and less weight.
  • the present invention is concerned with the problem of providing for a muffler of the type mentioned an improved embodiment, which is characterized in particular by a reduced overall volume.
  • the invention is based on the general idea not to design the outlet tube as a single tube, but as a tube assembly, as a tube-in-tube arrangement.
  • a tube-in-tube arrangement has at least one arranged in the housing of the muffler, closed on one side deflecting tube and led out of the housing outlet pipe. Due to the tube-in-tube arrangement, a comparatively long flow path can be realized with a short overall length, which takes place with the aid of corresponding deflections.
  • the tube-in-tube arrangement can build considerably shorter than a comparable tube with the same flow length. Studies have shown that the tube-in-tube arrangement achieves equivalent attenuation in terms of low frequencies as a through-tube. At higher frequencies even a better damping effect is achieved, which is attributed to the cross-sectional jumps in the area of the flow deflections.
  • the proposed construction thus enables a construction space-reduced realization of a silencer with a long flow path in the "outlet pipe" or in the outlet pipe arrangement, in which, moreover, the desired damping effect is ensured for low interference frequencies.
  • the tube-in-tube arrangement can produce a flow path which comprises at least two 180 ° deflections from the outlet space to the outlet tube. This results in a 3-fold stratification for the exhaust gas flow, which ultimately leads to a significant shortening of the outlet tube arrangement in relation to a single tube.
  • the deflecting tube has on its closed side a concavely curved bottom to the outlet tube.
  • the flow resistance of the muffler be reduced.
  • the housing or an outer tube enclosing the deflecting tube may have, on its side facing the open side of the deflecting tube, a concavely curved bottom in relation to the deflecting tube. As a result, the 180 ° deflection is favored, which reduces the flow resistance of the muffler.
  • a Strömungsumschkontur is attached to an open side of the deflection tube.
  • a resistance-reducing flow deflection can also be supported. This may be, for example, a deflecting collar which deflects the flow to the outside or a rounded end region, which likewise favors the flow around the flow.
  • the outlet tube can be provided to equip the outlet tube with a perforation on its inlet side, that is to say within the deflection tube.
  • a perforation can reduce the generation of higher-frequency noise.
  • the outlet pipe may be attached to its inlet side on the deflection tube. This results in a stabilization of the outlet tube within the tube-in-tube arrangement. The attachment of the outlet tube to the deflection tube can be carried out in particular in the region of the perforation.
  • Fig. 1 and 2 includes a muffler 1, which is preferably a rear muffler, a housing 2, which contains an outlet space 3. From the housing 2, an outlet tube assembly 4 is led out, in such a way that the outlet tube assembly 4 is fluidly connected to the inlet side located in the housing 2 outlet space 3.
  • the muffler 1 is integrated in the installed state in a here only partially recognizable exhaust system 5, which belongs to an internal combustion engine, not shown here, which are preferably arranged in a motor vehicle can. If the muffler 1 is preferably configured as a rear muffler 1, it is located in an exit-side end region of the exhaust system 5.
  • the outlet pipe arrangement 4 led out of the housing 2 comprises a so-called tail pipe 6 of the exhaust system 5 or is connected to this tail pipe 6.
  • the tailpipe 6 is characterized in that it has the outlet-side orifice of the exhaust system 5 or the respective strand of the exhaust system 5.
  • the rear silencer 1 is thus located on the tailpipe 6 or close to the tailpipe 6.
  • the outlet tube arrangement 4 is designed as a tube-in-tube arrangement 7. This comprises at least one deflection tube 8 and an outlet tube 9.
  • the deflection tube 8 is arranged in the housing 2 and is closed on one side.
  • the outlet pipe 9 is arranged in the deflection tube 8 and led out of the housing 2. If it is a rear muffler 1, the outlet pipe 9 may be connected to the tailpipe 6 or pass directly into the tailpipe 6 or even form the tailpipe 6.
  • the tube-in-tube arrangement 7 generates a flow path 10 indicated by arrows, which leads from the outlet space 3 to the outlet tube 9 or leads out of the housing 2 through the outlet tube 9.
  • the first 180 ° deflection 11 takes place in the housing 2 at the inlet into the deflecting tube 8.
  • the second 180 ° deflection 12 takes place in the deflecting tube 8 at the entrance to the outlet pipe.
  • the tube-in-tube arrangement 7 has an outer channel 13, which is formed radially between the housing 2 and the deflection tube 8.
  • the outer channel 13 may also be formed between the deflection tube 8 and an outer tube, not shown here, which is arranged within the housing 2 and which surrounds the deflection tube 8.
  • the tube-in-tube arrangement 7 here comprises an inner channel 14, which is formed radially between the deflection tube 8 and the outlet tube 9.
  • the first 180 ° deflection 11 connects the outer channel 13 with the inner channel 14.
  • the second 180 ° deflection 12 connects the inner channel 14 with the interior 15 of the outlet tube 9.
  • the housing 2, the deflection tube 8 and the outlet tube 9 and optionally the outer tube are arranged axially parallel to each other.
  • deflecting tube 8 and outlet tube 9 and optionally the outer tube can be arranged concentrically to each other.
  • all the tubes 8, 9 or the housing 2 involved are arranged eccentrically relative to one another.
  • the outlet tube 9 is arranged concentrically with respect to the housing 2, while the deflection tube 8 is arranged eccentrically to the housing 2 and to the outlet tube 9.
  • Fig. 6 another embodiment shown, in which the deflection tube 8 and the housing 2 show other round, in particular elliptical or oval, cross-sections. Chosen here is an example that leads to an extremely flat design for the muffler 1.
  • the deflection tube 8 and the housing 2 are flattened here so far that at the outlet tube 9, two diametrically opposed contracting points 16 result, in which the deflection tube 8 contacts both the outlet tube 9 and the housing 2.
  • the tubes 8, 9 and the housing 2 can be fastened to one another.
  • the flow-through cross-section of the outer channel 13 with respect to the flow-through cross-section of the inner channel 14 so that the cross-section through which the outer channel 13 flows is smaller than the cross-section through which the inner channel 14 can flow.
  • the cross-section through which the outer channel 13 flows can be the same be as large as the flow-through cross section of the inner channel 14. In this way, an excessive pressure increase is avoided when overflow from the outer channel 13 into the inner channel 14.
  • the cross-section of the inner channel 14 may also be provided here to select the cross-section of the inner channel 14 to be the same size as the cross-section through which the exhaust pipe 9 can flow the flow-through cross sections of the outer channel 13, the inner channel 14 and the outlet pipe 9 can be coordinated with each other with regard to a reduced flow resistance.
  • the deflecting tube 8 may be provided on its closed side with a bottom 17 which is concave towards the outlet tube 9 out.
  • the second 180 ° deflection 12 can be supported or realized with a reduced flow resistance.
  • the housing 2 on its side facing the open side of the deflecting tube 8 side equipped with a traversed by the outlet pipe 9 bottom 18, which is curved concavely towards the deflecting tube 8. By this shaping of the bottom 18, the first 180 ° deflection 11 can be supported or realized with a reduced flow resistance.
  • the deflection tube 8 may have a flow deflection contour 19 on its open side. Again, this is a measure to reduce the flow resistance.
  • the flow deflection contour 19 may be a deflection collar 20 that deflects the flow outward. In contrast, it may vary according to Fig. 8 at the Strömungsumschkontur 19 also act around a rounded end portion 21. Likewise, other configurations, not shown here, for the flow deflection contour 19 are conceivable.
  • the outlet pipe 9 is provided at its inlet side with a perforation 22.
  • a perforation 22 may hinder noise when flowing into the outlet pipe 9.
  • the outlet tube 9 protrudes into the deflection tube 8 far enough that it can be fastened to the deflection tube 8 on its inlet side.
  • the outlet pipe 9 in the region of its perforation 22 on the deflection tube 8, namely attached to the bottom 17.
  • the outlet pipe 9 is stabilized within the tube-in-tube arrangement 7.
  • Fig. 8 an embodiment in which the outlet pipe 9 projects freestanding in the deflection tube 8.
  • FIGS. 7 and 8 These are half-sections, with a dot-dash line 23 representing a line of symmetry with respect to which the respective representation can be supplemented with mirror symmetry.

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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)

Abstract

The silencer (1) has a housing (2), in which an exit space (3) is provided, and an exit tube assembly (4) leading out from the housing, which is connected with intake-side of the exit space. The exit tube assembly has a return pipe (8) and an outlet pipe (9).

Description

Die vorliegende Erfindung betrifft einen Schalldämpfer, insbesondere einen Nachschalldämpfer, für eine Abgasanlage einer Brennkraftmaschine, insbesondere eines Kraftfahrzeugs.The present invention relates to a silencer, in particular a rear silencer, for an exhaust system of an internal combustion engine, in particular of a motor vehicle.

In einer Abgasanlage befindet sich ein sogenannter Nachschalldämpfer üblicherweise in einem austrittsseitigen Endabschnitt der Abgasanlage. Ein aus dem Nachschalldämpfer herausführendes Austrittsrohr bildet üblicherweise ein sogenanntes Endrohr oder ist an ein solches Endrohr angeschlossen. Das Endrohr besitzt die zur Umgebung offene Mündungsöffnung der Abgasanlage. Üblicherweise umfasst ein Schalldämpfer ein Gehäuse, in dem sich ein Austrittsraum befindet, aus dem das genannte Austrittsrohr herausführt. Zur Bedämpfung tieffrequenter Störgeräusche ist es üblich, das Austrittsrohr des Nachschalldämpfers bzw. das Endrohr vergleichsweise lang auszuführen. Hierzu wird vergleichsweise viel Bauraum benötigt. Insbesondere bei kleineren Fahrzeugen steht nur wenig Bauraum zur Verfügung. Die Verwendung von Austrittsrohren bzw. Endrohren großer Länge ist gerade bei kleineren Brennkraftmaschinen mit beispielsweise drei oder vier Zylindern von erhöhter Bedeutung, insbesondere wenn die Schalldämpfung insgesamt mit weniger Bauraum und weniger Gewicht realisiert werden soll.In an exhaust system, a so-called rear silencer is usually located in an exit-side end section of the exhaust system. A leading out of the rear silencer outlet pipe usually forms a so-called tail pipe or is connected to such a tail pipe. The tailpipe has the open mouth of the exhaust system to the environment. Typically, a silencer includes a housing in which there is an exit space from which said exit pipe leads out. To dampen low-frequency noise, it is customary to perform the outlet pipe of the rear silencer and the tailpipe comparatively long. This comparatively much space is needed. Especially with smaller vehicles, only a small amount of space is available. The use of outlet pipes or tailpipes of great length is of particular importance for smaller internal combustion engines with, for example, three or four cylinders, especially if the overall soundproofing is to be realized with less space and less weight.

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 Bauvolumen auszeichnet.The present invention is concerned with the problem of providing for a muffler of the type mentioned an improved embodiment, which is characterized in particular by a reduced overall volume.

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

Die Erfindung beruht auf dem allgemeinen Gedanken, das Austrittsrohr nicht als einzelnes Rohr, sondern als Rohranordnung, und zwar als Rohr-in-Rohr-Anordnung auszugestalten. Eine derartige Rohr-in-Rohr-Anordnung weist zumindest ein im Gehäuse des Schalldämpfers angeordnetes, einseitig verschlossenes Umlenkrohr und ein aus dem Gehäuse herausgeführtes Austrittsrohr auf. Durch die Rohr-in-Rohr-Anordnung kann bei kurzer Baulänge ein vergleichsweise langer Strömungspfad realisiert werden, was mit Hilfe entsprechender Umlenkungen erfolgt. Die Rohr-in-Rohr-Anordnung kann bei gleicher Strömungslänge erheblich kürzer bauen als ein vergleichbares Rohr. Untersuchungen haben gezeigt, dass die Rohr-in-Rohr-Anordnung hinsichtlich der tiefen Frequenzen eine gleichwertige Dämpfung erzielt wie ein durchgehendes Rohr. Bei höheren Frequenzen wird sogar eine bessere Dämpfungswirkung erreicht, was auf die Querschnittssprünge im Bereich der Strömungsumlenkungen zurückgeführt wird.The invention is based on the general idea not to design the outlet tube as a single tube, but as a tube assembly, as a tube-in-tube arrangement. Such a tube-in-tube arrangement has at least one arranged in the housing of the muffler, closed on one side deflecting tube and led out of the housing outlet pipe. Due to the tube-in-tube arrangement, a comparatively long flow path can be realized with a short overall length, which takes place with the aid of corresponding deflections. The tube-in-tube arrangement can build considerably shorter than a comparable tube with the same flow length. Studies have shown that the tube-in-tube arrangement achieves equivalent attenuation in terms of low frequencies as a through-tube. At higher frequencies even a better damping effect is achieved, which is attributed to the cross-sectional jumps in the area of the flow deflections.

Die vorgeschlagene Bauweise ermöglicht somit eine bauraumreduzierte Realisierung eines Schalldämpfers mit langem Strömungsweg im "Austrittsrohr" bzw. in der Austrittsrohranordnung, bei der außerdem die gewünschte Dämpfungswirkung für tiefe Störfrequenzen gewährleistet ist.The proposed construction thus enables a construction space-reduced realization of a silencer with a long flow path in the "outlet pipe" or in the outlet pipe arrangement, in which, moreover, the desired damping effect is ensured for low interference frequencies.

Entsprechend einer vorteilhaften Ausführungsform kann die Rohr-in-Rohr-Anordnung einen Strömungspfad erzeugen, der vom Austrittsraum bis zum Austrittsrohr zumindest zwei 180°-Umlenkungen umfasst. Hierdurch ergibt sich für die Abgasströmung eine 3-fach-Schichtung, was letztlich zu einer signifikanten Verkürzung der Austrittsrohranordnung gegenüber einem Einfachrohr führt.According to an advantageous embodiment, the tube-in-tube arrangement can produce a flow path which comprises at least two 180 ° deflections from the outlet space to the outlet tube. This results in a 3-fold stratification for the exhaust gas flow, which ultimately leads to a significant shortening of the outlet tube arrangement in relation to a single tube.

Bei einer anderen Ausführungsform kann vorgesehen sein, dass das Umlenkrohr an seiner verschlossenen Seite einen zum Austrittsrohr konkav gewölbten Boden aufweist. Hierdurch kann der Durchströmungswiderstand des Schalldämpfers reduziert werden. Zusätzlich oder alternativ kann das Gehäuse oder ein das Umlenkrohr umhüllendes Außenrohr an seiner der offenen Seite des Umlenkrohrs zugewandten Seite einen zum Umlenkrohr konkav gewölbten Boden aufweisen. Hierdurch wird die 180°-Umlenkung begünstigt, was den Durchströmungswiderstand des Schalldämpfers reduziert.In another embodiment, it can be provided that the deflecting tube has on its closed side a concavely curved bottom to the outlet tube. As a result, the flow resistance of the muffler be reduced. In addition or as an alternative, the housing or an outer tube enclosing the deflecting tube may have, on its side facing the open side of the deflecting tube, a concavely curved bottom in relation to the deflecting tube. As a result, the 180 ° deflection is favored, which reduces the flow resistance of the muffler.

Eine weitere optionale Maßnahme zur Reduzierung des Strömungswiderstands ist die Anbringung einer Strömungsumlenkkontur an einer offenen Seite des Umlenkrohrs. Mit Hilfe einer derartigen Strömungsumlenkkontur kann ebenfalls eine widerstandsreduzierende Strömungsumlenkung unterstützt werden. Hierbei kann es sich beispielsweise um einen die Strömung nach außen ablenkenden Ablenkkragen handeln oder um einen abgerundeten Endbereich, der ebenfalls die Umströmung begünstigt.Another optional measure for reducing the flow resistance is the attachment of a Strömungsumlenkkontur on an open side of the deflection tube. With the help of such Strömungsumlenkkontur a resistance-reducing flow deflection can also be supported. This may be, for example, a deflecting collar which deflects the flow to the outside or a rounded end region, which likewise favors the flow around the flow.

Gemäß einer anderen vorteilhaften Ausführungsform kann vorgesehen sein, das Austrittsrohr an seiner Eintrittsseite, also innerhalb des Umlenkrohrs, mit einer Perforation auszustatten. Eine derartige Perforation kann die Entstehung von höherfrequenten Geräuschen reduzieren. Zusätzlich oder alternativ kann das Austrittsrohr an seiner Eintrittsseite am Umlenkrohr befestigt sein. Hierdurch ergibt sich eine Stabilisierung des Austrittsrohrs innerhalb der Rohr-in-Rohr-Anordnung. Die Befestigung des Austrittsrohrs am Umlenkrohr kann insbesondere auch im Bereich der Perforation erfolgen.According to another advantageous embodiment, it can be provided to equip the outlet tube with a perforation on its inlet side, that is to say within the deflection tube. Such a perforation can reduce the generation of higher-frequency noise. Additionally or alternatively, the outlet pipe may be attached to its inlet side on the deflection tube. This results in a stabilization of the outlet tube within the tube-in-tube arrangement. The attachment of the outlet tube to the deflection tube can be carried out in particular in the region of the perforation.

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 not only in the combination specified, but can also be used 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 und 2
je einen stark vereinfachten Längsschnitt durch einen Schalldämpfer, bei verschiedenen Ausführungsformen,
Fig. 3 bis 6
je einen Querschnitt der Schalldämpfer aus den Fig. 1 und 2 entsprechend Schnittlinien III in Fig. 1, bei verschiedenen Ausführungsformen,
Fig. 7 und 8
stark vereinfachte, halbe Längsschnitte des Schalldämpfers bei wei-teren Ausführungsformen.
It show, each schematically
Fig. 1 and 2
each a greatly simplified longitudinal section through a muffler, in various embodiments,
Fig. 3 to 6
depending on a cross section of the muffler from the Fig. 1 and 2 according to section lines III in Fig. 1 in various embodiments,
FIGS. 7 and 8
highly simplified, half longitudinal sections of the muffler in further embodiments.

Entsprechend den Fig. 1 und 2 umfasst ein Schalldämpfer 1, bei dem es sich bevorzugt um einen Nachschalldämpfer handelt, ein Gehäuse 2, das einen Austrittsraum 3 enthält. Aus dem Gehäuse 2 ist eine Austrittsrohranordnung 4 herausgeführt, und zwar derart, dass die Austrittsrohranordnung 4 einlassseitig mit dem im Gehäuse 2 befindlichen Austrittsraum 3 fluidisch verbunden ist.According to the Fig. 1 and 2 includes a muffler 1, which is preferably a rear muffler, a housing 2, which contains an outlet space 3. From the housing 2, an outlet tube assembly 4 is led out, in such a way that the outlet tube assembly 4 is fluidly connected to the inlet side located in the housing 2 outlet space 3.

Der Schalldämpfer 1 ist im eingebauten Zustand in eine hier nur teilweise erkennbare Abgasanlage 5 eingebunden, die zu einer hier nicht gezeigten Brennkraftmaschine gehört, die vorzugsweise in einem Kraftfahrzeug angeordnet sein kann. Sofern der Schalldämpfer 1 bevorzugt als Nachschalldämpfer 1 ausgestaltet ist, befindet er sich in einem austrittsseitigen Endbereich der Abgasanlage 5. Insbesondere umfasst die aus dem Gehäuse 2 herausgeführte Austrittsrohranordnung 4 ein sogenanntes Endrohr 6 der Abgasanlage 5 oder ist an dieses Endrohr 6 angeschlossen. Das Endrohr 6 charakterisiert sich dadurch, dass es die austrittsseitige Mündungsöffnung der Abgasanlage 5 bzw. des jeweiligen Strangs der Abgasanlage 5 aufweist. Der Nachschalldämpfer 1 befindet sich somit am Endrohr 6 bzw. nahe am Endrohr 6.The muffler 1 is integrated in the installed state in a here only partially recognizable exhaust system 5, which belongs to an internal combustion engine, not shown here, which are preferably arranged in a motor vehicle can. If the muffler 1 is preferably configured as a rear muffler 1, it is located in an exit-side end region of the exhaust system 5. In particular, the outlet pipe arrangement 4 led out of the housing 2 comprises a so-called tail pipe 6 of the exhaust system 5 or is connected to this tail pipe 6. The tailpipe 6 is characterized in that it has the outlet-side orifice of the exhaust system 5 or the respective strand of the exhaust system 5. The rear silencer 1 is thus located on the tailpipe 6 or close to the tailpipe 6.

Beim hier vorgestellten Schalldämpfer 1 ist die Austrittsrohranordnung 4 als Rohr-in-Rohr-Anordnung 7 ausgestaltet. Diese umfasst zumindest ein Umlenkrohr 8 und ein Austrittsrohr 9. Das Umlenkrohr 8 ist im Gehäuse 2 angeordnet und ist einseitig verschlossen. Das Austrittsrohr 9 ist im Umlenkrohr 8 angeordnet und aus dem Gehäuse 2 herausgeführt. Sofern es sich um einen Nachschalldämpfer 1 handelt, kann das Austrittsrohr 9 an das Endrohr 6 angeschlossen sein oder unmittelbar in das Endrohr 6 übergehen oder selbst das Endrohr 6 bilden.In the case of the silencer 1 presented here, the outlet tube arrangement 4 is designed as a tube-in-tube arrangement 7. This comprises at least one deflection tube 8 and an outlet tube 9. The deflection tube 8 is arranged in the housing 2 and is closed on one side. The outlet pipe 9 is arranged in the deflection tube 8 and led out of the housing 2. If it is a rear muffler 1, the outlet pipe 9 may be connected to the tailpipe 6 or pass directly into the tailpipe 6 or even form the tailpipe 6.

Im gezeigten Beispiel erzeugt die Rohr-in-Rohr-Anordnung 7 einen durch Pfeile angedeuteten Strömungspfad 10, der vom Austrittsraum 3 bis zum Austrittsrohr 9 führt bzw. durch das Austrittsrohr 9 aus dem Gehäuse 2 führt. Zwischen Austrittsraum 3 und Austrittsrohr 9 beinhaltet dieser Strömungspfad 10 zumindest zwei 180°-Umlenkungen 11 bzw. 12. Die erste 180°-Umlenkung 11 erfolgt im Gehäuse 2 am Eintritt in das Umlenkrohr 8. Die zweite 180°-Umlenkung 12 erfolgt im Umlenkrohr 8 am Eintritt in das Austrittsrohr 9.In the example shown, the tube-in-tube arrangement 7 generates a flow path 10 indicated by arrows, which leads from the outlet space 3 to the outlet tube 9 or leads out of the housing 2 through the outlet tube 9. The first 180 ° deflection 11 takes place in the housing 2 at the inlet into the deflecting tube 8. The second 180 ° deflection 12 takes place in the deflecting tube 8 at the entrance to the outlet pipe. 9

Bei der hier vorgestellten Konfiguration weist die Rohr-in-Rohr-Anordnung 7 einen Außenkanal 13 auf, der radial zwischen dem Gehäuse 2 und dem Umlenkrohr 8 ausgebildet ist. Bei einer anderen Ausführungsform kann der Außenkanal 13 auch zwischen dem Umlenkrohr 8 und einem hier nicht dargestellten Außenrohr ausgebildet sein, das innerhalb des Gehäuses 2 angeordnet ist und das das Umlenkrohr 8 umhüllt. Des Weiteren umfasst die Rohr-in-Rohr-Anordnung 7 hier einen Innenkanal 14, der radial zwischen dem Umlenkrohr 8 und dem Austrittsrohr 9 ausgebildet ist. Die erste 180°-Umlenkung 11 verbindet den Außenkanal 13 mit dem Innenkanal 14. Die zweite 180°-Umlenkung 12 verbindet den Innenkanal 14 mit dem Inneren 15 des Austrittsrohrs 9.In the configuration presented here, the tube-in-tube arrangement 7 has an outer channel 13, which is formed radially between the housing 2 and the deflection tube 8. In another embodiment, the outer channel 13 may also be formed between the deflection tube 8 and an outer tube, not shown here, which is arranged within the housing 2 and which surrounds the deflection tube 8. Furthermore, the tube-in-tube arrangement 7 here comprises an inner channel 14, which is formed radially between the deflection tube 8 and the outlet tube 9. The first 180 ° deflection 11 connects the outer channel 13 with the inner channel 14. The second 180 ° deflection 12 connects the inner channel 14 with the interior 15 of the outlet tube 9.

Zweckmäßig sind das Gehäuse 2, das Umlenkrohr 8 und das Austrittsrohr 9 und gegebenenfalls das Außenrohr zueinander achsparallel ineinander angeordnet. Gemäß Fig. 3 können Gehäuse 2, Umlenkrohr 8 und Austrittsrohr 9 sowie gegebenenfalls das Außenrohr konzentrisch zueinander angeordnet sein. Bei der in Fig. 4 gezeigten Ausführungsform sind alle beteiligten Rohre 8, 9 bzw. das Gehäuse 2 zueinander exzentrisch angeordnet. Bei der in Fig. 5 gezeigten Ausführungsform ist das Austrittsrohr 9 zum Gehäuse 2 konzentrisch angeordnet, während das Umlenkrohr 8 zum Gehäuse 2 und zum Austrittsrohr 9 exzentrisch angeordnet ist.Suitably, the housing 2, the deflection tube 8 and the outlet tube 9 and optionally the outer tube are arranged axially parallel to each other. According to Fig. 3 Housing 2, deflecting tube 8 and outlet tube 9 and optionally the outer tube can be arranged concentrically to each other. At the in Fig. 4 In the embodiment shown, all the tubes 8, 9 or the housing 2 involved are arranged eccentrically relative to one another. At the in Fig. 5 In the embodiment shown, the outlet tube 9 is arranged concentrically with respect to the housing 2, while the deflection tube 8 is arranged eccentrically to the housing 2 and to the outlet tube 9.

Während die Fig. 3 bis 5 Ausführungsformen mit kreisförmigen Querschnitten zeigen, ist in Fig. 6 eine andere Ausführungsform dargestellt, bei der das Umlenkrohr 8 und das Gehäuse 2 andere runde, insbesondere elliptische oder ovale, Querschnitte zeigen. Gewählt ist hier ein Beispiel, das zu einer extrem flachen Bauform für den Schalldämpfer 1 führt. Insbesondere sind das Umlenkrohr 8 und das Gehäuse 2 hier soweit abgeflacht, dass sich am Austrittsrohr 9 zwei diametral gegenüberliegende Kontraktstellen 16 ergeben, in denen das Umlenkrohr 8 sowohl das Austrittsrohr 9 als auch das Gehäuse 2 berührt. Im Bereich dieser Kontaktstellen 16 können die Rohre 8, 9 und das Gehäuse 2 aneinander befestigt sein.While the Fig. 3 to 5 Embodiments with circular cross sections show is in Fig. 6 another embodiment shown, in which the deflection tube 8 and the housing 2 show other round, in particular elliptical or oval, cross-sections. Chosen here is an example that leads to an extremely flat design for the muffler 1. In particular, the deflection tube 8 and the housing 2 are flattened here so far that at the outlet tube 9, two diametrically opposed contracting points 16 result, in which the deflection tube 8 contacts both the outlet tube 9 and the housing 2. In the area of these contact points 16, the tubes 8, 9 and the housing 2 can be fastened to one another.

Zur Reduzierung des Durchströmungswiderstands des Schalldämpfers 1 können unterschiedliche Maßnahmen realisiert werden. Beispielsweise ist es möglich, den durchströmbaren Querschnitt des Außenkanals 13 im Hinblick auf den durchströmbaren Querschnitt des Innenkanals 14 so zu dimensionieren, dass der durchströmbare Querschnitt des Außenkanals 13 kleiner ist als der durchströmbare Querschnitt der Innenkanals 14. Ebenso kann der durchströmbare Querschnitt des Außenkanals 13 gleich groß sein wie der durchströmbare Querschnitt des Innenkanals 14. Hierdurch wird ein übermäßiger Druckanstieg beim Überströmen vom Außenkanal 13 in den Innenkanal 14 vermieden. Zusätzlich oder alternativ kann vorgesehen sein, dass der durchströmbare Querschnitt des Innenkanals 14 kleiner ist als der durchströmbare Querschnitt des Austrittsrohrs 9. Ebenso kann auch hier vorgesehen sein, den durchströmbaren Querschnitt des Innenkanals 14 gleich groß zu wählen wie den durchströmbaren Querschnitt des Austrittsrohrs 9. Allgemein können die durchströmbaren Querschnitte des Außenkanals 13, des Innenkanals 14 und des Austrittsrohrs 9 hinsichtlich eines reduzierten Durchströmungswiderstands aufeinander abgestimmt sein.To reduce the flow resistance of the muffler 1 different measures can be realized. For example, it is possible to dimension the flow-through cross-section of the outer channel 13 with respect to the flow-through cross-section of the inner channel 14 so that the cross-section through which the outer channel 13 flows is smaller than the cross-section through which the inner channel 14 can flow. Likewise, the cross-section through which the outer channel 13 flows can be the same be as large as the flow-through cross section of the inner channel 14. In this way, an excessive pressure increase is avoided when overflow from the outer channel 13 into the inner channel 14. Additionally or alternatively, it may be provided that the flow-through cross section of the inner channel 14 is smaller than the cross-section through which the exhaust pipe 9 can flow. It may also be provided here to select the cross-section of the inner channel 14 to be the same size as the cross-section through which the exhaust pipe 9 can flow the flow-through cross sections of the outer channel 13, the inner channel 14 and the outlet pipe 9 can be coordinated with each other with regard to a reduced flow resistance.

Optional kann vorgesehen sein, gemäß Fig. 2 das Umlenkrohr 8 an seiner verschlossen Seite mit einem Boden 17 zu versehen, der zum Austrittsrohr 9 hin konkav gewölbt ist. Hierdurch kann die zweite 180°-Umlenkung 12 unterstützt bzw. mit einem reduzierten Strömungswiderstand realisiert werden. Zusätzlich oder alternativ hierzu ist im Beispiel der Fig. 2 außerdem das Gehäuse 2 an seiner der offenen Seite des Umlenkrohrs 8 zugewandten Seite mit einem vom Austrittsrohr 9 durchsetzten Boden 18 ausgestattet, der zum Umlenkrohr 8 hin konkav gewölbt ist. Durch diese Formgebung des Bodens 18 kann die erste 180°-Umlenkung 11 unterstützt bzw. mit einem reduzierten Strömungswiderstand realisiert werden.Optionally, it may be provided according to Fig. 2 the deflecting tube 8 to be provided on its closed side with a bottom 17 which is concave towards the outlet tube 9 out. As a result, the second 180 ° deflection 12 can be supported or realized with a reduced flow resistance. Additionally or alternatively, in the example of the Fig. 2 In addition, the housing 2 on its side facing the open side of the deflecting tube 8 side equipped with a traversed by the outlet pipe 9 bottom 18, which is curved concavely towards the deflecting tube 8. By this shaping of the bottom 18, the first 180 ° deflection 11 can be supported or realized with a reduced flow resistance.

Gemäß den Fig. 7 und 8 kann das Umlenkrohr 8 an seiner offenen Seite eine Strömungsumlenkkontur 19 aufweisen. Auch hierbei handelt es sich um eine Maßnahme zur Reduzierung des Strömungswiderstands. Gemäß Fig. 7 kann es sich bei der Strömungsumlenkkontur 19 beispielsweise um einen die Strömung nach außen ablenkenden Ablenkkragen 20 handeln. Im Unterschied dazu kann es sich gemäß Fig. 8 bei der Strömungsumlenkkontur 19 auch um einen abgerundeten Endbereich 21 handeln. Ebenso sind andere, hier nicht gezeigte Konfigurationen für die Strömungsumlenkkontur 19 denkbar.According to the FIGS. 7 and 8 the deflection tube 8 may have a flow deflection contour 19 on its open side. Again, this is a measure to reduce the flow resistance. According to Fig. 7 For example, the flow deflection contour 19 may be a deflection collar 20 that deflects the flow outward. In contrast, it may vary according to Fig. 8 at the Strömungsumlenkkontur 19 also act around a rounded end portion 21. Likewise, other configurations, not shown here, for the flow deflection contour 19 are conceivable.

Bei den Ausführungsformen der Fig. 7 und 8 ist das Austrittsrohr 9 an seiner Eintrittsseite mit einer Perforation 22 versehen. Eine derartige Perforation 22 kann eine Geräuschbildung beim Einströmen in das Austrittsrohr 9 behindern. Bei der in Fig. 7 gezeigten Ausführungsform ragt das Austrittsrohr 9 soweit in das Umlenkrohr 8 hinein, dass es an seiner Eintrittsseite am Umlenkrohr 8 befestigt werden kann. Im Beispiel ist das Austrittsrohr 9 im Bereich seiner Perforation 22 am Umlenkrohr 8, und zwar an dessen Boden 17 befestigt. Hierdurch wird das Austrittsrohr 9 innerhalb der Rohr-in-Rohr-Anordnung 7 stabilisiert. Im Unterschied dazu zeigt Fig. 8 eine Ausführungsform, bei welcher das Austrittsrohr 9 freistehend in das Umlenkrohr 8 hineinragt.In the embodiments of the FIGS. 7 and 8 the outlet pipe 9 is provided at its inlet side with a perforation 22. Such a perforation 22 may hinder noise when flowing into the outlet pipe 9. At the in Fig. 7 In the embodiment shown, the outlet tube 9 protrudes into the deflection tube 8 far enough that it can be fastened to the deflection tube 8 on its inlet side. In the example, the outlet pipe 9 in the region of its perforation 22 on the deflection tube 8, namely attached to the bottom 17. As a result, the outlet pipe 9 is stabilized within the tube-in-tube arrangement 7. In contrast, shows Fig. 8 an embodiment in which the outlet pipe 9 projects freestanding in the deflection tube 8.

Bei den Darstellungen der Fig. 7 und 8 handelt es sich um Halbschnitte, wobei eine strichpunktierte Linie 23 eine Symmetrielinie repräsentiert, bezüglich der die jeweilige Darstellung spiegelsymmetrisch ergänzt werden kann.In the representations of FIGS. 7 and 8 These are half-sections, with a dot-dash line 23 representing a line of symmetry with respect to which the respective representation can be supplemented with mirror symmetry.

Claims (10)

Schalldämpfer, insbesondere Nachschalldämpfer, für eine Abgasanlage (5) einer Brennkraftmaschine, insbesondere eines Kraftfahrzeugs, - mit einem Gehäuse (2), in dem sich ein Austrittsraum (3) befindet, - mit einer aus dem Gehäuse (2) herausführenden Austrittsrohranordnung (4), die einlassseitig mit dem Austrittsraum (3) fluidisch verbunden ist, - wobei die Austrittsrohranordnung (4) als Rohr-in-Rohr-Anordnung (7) ausgestaltet ist, die zumindest ein im Gehäuse (2) angeordnetes, einseitig verschlossenes Umlenkrohr (8) und ein aus dem Gehäuse (2) herausgeführtes Austrittsrohr (9) aufweist. Silencer, in particular rear silencer, for an exhaust system (5) of an internal combustion engine, in particular of a motor vehicle, - With a housing (2) in which an outlet space (3) is located, with an outlet pipe arrangement (4) leading out of the housing (2), which is fluidically connected to the outlet space (3) on the inlet side, - wherein the outlet tube assembly (4) is designed as a tube-in-tube arrangement (7), the at least one in the housing (2) arranged on one side closed deflector tube (8) and an out of the housing (2) led out outlet tube (9) having. Schalldämpfer nach Anspruch 1,
dadurch gekennzeichnet,
dass die Rohr-in-Rohr-Anordnung (7) einen Strömungspfad (10) erzeugt, der vom Austrittsraum (3) bis zum Austrittsrohr (9) mindestens zwei 180°-Umlenkungen (11, 12) aufweist.Silencer according to claim 1,
characterized,
in that the tube-in-tube arrangement (7) generates a flow path (10) which has at least two 180 ° deflections (11, 12) from the outlet space (3) to the outlet tube (9). Schalldämpfer nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
dass die Rohr-in-Rohr-Anordnung (7) einen radial zwischen dem Umlenkrohr (8) und dem Gehäuse (2) oder einen das Umlenkrohr (8) umhüllenden Außenrohr ausgebildeten Außenkanal (13) aufweist.Silencer according to claim 1 or 2,
characterized,
that the tube-in-tube arrangement (7) has a radially between the deflecting pipe (8) and the housing (2) or the deflection tube enveloping (8) outer tube shaped outer channel (13). Schalldämpfer nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet,
dass die Rohr-in-Rohr-Anordnung (7) einen radial zwischen dem Umlenkrohr (8) und dem Austrittsrohr (9) ausgebildeten Innenkanal (14) aufweist.Silencer according to one of claims 1 to 3,
characterized,
that has the tube-in-tube arrangement (7) formed on a radially between the deflecting pipe (8) and the outlet pipe (9) internal channel (14). Schalldämpfer nach Anspruch 3 oder 4,
dadurch gekennzeichnet, - dass der durchströmbare Querschnitt des Außenkanals (13) kleiner ist als oder gleich groß ist wie der durchströmbare Querschnitt des Innenkanals (14), und/oder - dass der durchströmbare Querschnitt des Innenkanals (14) kleiner ist als oder gleich groß ist wie der durchströmbare Querschnitt des Austrittsrohrs (9), und/oder - dass die durchströmbaren Querschnitte des Austrittskanals (9), des Innenkanals (14) und des Außenkanals (13) hinsichtlich eines reduzierten Durchströmungswiderstands aufeinander abgestimmt sind. Silencer according to claim 3 or 4,
characterized, - That the flow-through cross-section of the outer channel (13) is smaller than or equal to the size of the flow-through cross-section of the inner channel (14), and / or - That the durchströmbare cross-section of the inner channel (14) is smaller than or equal to the size of the flow-through cross-section of the outlet pipe (9), and / or - That the flow-through cross-sections of the outlet channel (9), the inner channel (14) and the outer channel (13) are coordinated with respect to a reduced flow resistance. Schalldämpfer nach einem der Ansprüche 1 bis 5,
dadurch gekennzeichnet,
dass das Gehäuse (2) oder ein das Umlenkrohr (8) umhüllendes Außenrohr, das Umlenkrohr (8) und das Austrittsrohr (9) zueinander achsparallel ineinander angeordnet sind.Silencer according to one of claims 1 to 5,
characterized,
in that the housing (2) or an outer tube enclosing the deflecting tube (8), the deflecting tube (8) and the outlet tube (9) are arranged mutually axially parallel to one another. Schalldämpfer nach Anspruch 6,
dadurch gekennzeichnet, - dass das Gehäuse (2) oder ein das Umlenkrohr (8) umhüllendes Außenrohr, das Umlenkrohr (8) und das Austrittsrohr (9) konzentrisch zueinander angeordnet sind, oder - dass zumindest zwei aus der Gruppe Gehäuse (2) oder das Umlenkrohr (8) umhüllendes Außenrohr, Umlenkrohr (8) und Austrittsrohr (9) exzentrisch zueinander angeordnet sind. Silencer according to claim 6,
characterized, - That the housing (2) or the deflection tube (8) enveloping outer tube, the deflection tube (8) and the outlet tube (9) are arranged concentrically to each other, or - That at least two from the group housing (2) or the deflection tube (8) enveloping outer tube, deflecting tube (8) and outlet tube (9) are arranged eccentrically to one another. Schalldämpfer nach einem der Ansprüche 1 bis 7,
dadurch gekennzeichnet, - dass das Umlenkrohr (8) an seiner verschlossenen Seite einen zum Austrittsrohr (9) konkav gewölbten Boden (17) aufweist, und/oder - dass das Gehäuse (2) oder ein das Umlenkrohr (8) umhüllendes Außenrohr an seiner der offenen Seite des Umlenkrohrs (8) zugewandten Seite einen zum Umlenkrohr (8) konkav gewölbten Boden (18) aufweist. Silencer according to one of claims 1 to 7,
characterized, - That the deflection tube (8) on its closed side to the outlet pipe (9) concave curved bottom (17), and / or - That the housing (2) or the deflecting tube (8) enveloping the outer tube at its the open side of the deflecting tube (8) facing side to a deflecting tube (8) concavely curved bottom (18). Schalldämpfer nach einem der Ansprüche 1 bis 8,
dadurch gekennzeichnet, - dass das Umlenkrohr (8) an seiner offenen Seite eine Strömungsumlenkkontur (19) aufweist, - wobei insbesondere vorgesehen sein kann, dass die Strömungsumlenkkontur (19) als ein die Strömung nach außen ablenkender Ablenkkragen (20) ausgestaltet ist oder als abgerundeter Endbereich (21) ausgestaltet ist. Silencer according to one of claims 1 to 8,
characterized, in that the deflecting tube (8) has a flow deflecting contour (19) on its open side, - In particular, it may be provided that the Strömungsumlenkkontur (19) as a flow outwardly deflecting Ablenkkragen (20) is configured or configured as a rounded end portion (21). Schalldämpfer nach einem der Ansprüche 1 bis 9,
dadurch gekennzeichnet, - dass das Austrittsrohr (9) an seiner Eintrittsseite eine Perforation (22) aufweist, und/oder - dass das Austrittsrohr (9) an seiner Eintrittsseite am Umlenkrohr (8) befestigt ist. Silencer according to one of claims 1 to 9,
characterized, - That the outlet pipe (9) has a perforation (22) on its inlet side, and / or - That the outlet pipe (9) is fixed at its inlet side on the deflection tube (8).
EP11150812.3A 2010-02-18 2011-01-13 Sound absorber Active EP2362076B1 (en)

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CN102162386A (en) 2011-08-24
US8302732B2 (en) 2012-11-06
EP2362076B1 (en) 2014-04-02
US20110198150A1 (en) 2011-08-18
DE102010008403A1 (en) 2011-08-18
CN102162386B (en) 2015-06-17
JP2011169323A (en) 2011-09-01
JP6039880B2 (en) 2016-12-07
EP2362076A3 (en) 2012-05-16

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