EP1914398A1 - Exhaust gas back muffler - Google Patents

Exhaust gas back muffler Download PDF

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Publication number
EP1914398A1
EP1914398A1 EP07013854A EP07013854A EP1914398A1 EP 1914398 A1 EP1914398 A1 EP 1914398A1 EP 07013854 A EP07013854 A EP 07013854A EP 07013854 A EP07013854 A EP 07013854A EP 1914398 A1 EP1914398 A1 EP 1914398A1
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EP
European Patent Office
Prior art keywords
exhaust
exhaust gas
chamber
pipe
perforated
Prior art date
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Granted
Application number
EP07013854A
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German (de)
French (fr)
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EP1914398B1 (en
Inventor
Jörg Winkel
Bernd Stadler
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Dr Ing HCF Porsche AG
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Dr Ing HCF Porsche AG
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Publication of EP1914398A1 publication Critical patent/EP1914398A1/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
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
    • F01N1/04—Silencing apparatus characterised by method of silencing by using resonance having sound-absorbing materials in resonance chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/003—Silencing apparatus characterised by method of silencing by using dead chambers communicating with gas flow passages
    • F01N1/006—Silencing apparatus characterised by method of silencing by using dead chambers communicating with gas flow passages comprising at least one perforated tube extending from inlet to outlet of the silencer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • 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
    • 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
    • F01N1/085—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using a central core throttling gas passage
    • 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
    • F01N1/089—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using two or more expansion chambers in series
    • 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
    • F01N1/10—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling in combination with sound-absorbing materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/16—Silencing apparatus characterised by method of silencing by using movable parts
    • F01N1/166—Silencing apparatus characterised by method of silencing by using movable parts for changing gas flow path through the silencer or for adjusting the dimensions of a chamber or a pipe
    • 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
    • F01N13/02—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 having two or more separate silencers in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/14—Plurality of outlet tubes, e.g. in parallel or with different length
    • 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
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/02—Two or more expansion chambers in series connected by means of tubes

Definitions

  • the invention relates to an exhaust gas silencer for an internal combustion engine according to the preamble of claim 1.
  • the object of the invention is to provide an exhaust gas muffler for a motor vehicle, which has a simple to manufacture and assemblable structure and which generates a damped or unattenuated exhaust noise as a function of an exhaust valve position.
  • the advantages achieved by the invention are that a desired damped and unattenuated exhaust noise during driving can be generated by a closed or open exhaust flap through the internal structure of the exhaust gas muffler.
  • This noise optimization is carried out by the exhaust muffler comprises two exhaust guide tubes, wherein the first exhaust pipe inside the exhaust muffler has an opening for forced exiting exhaust gases from the second exhaust pipe with the shut-off valve closed, in which the exhaust gases of the internal combustion engine can flow directly.
  • the second exhaust-gas guide tube is used to discharge exhaust gases when the exhaust gas is closed
  • shut-off valve with two perforated pipe sections, which are arranged in each of a second and third chamber of the exhaust gas muffler.
  • the now forcibly deflected exhaust gas stream flows through the perforated pipe sections of the exhaust pipe in such a way that a first chamber of Abgasnachschalldämpfers in which the mouth opening of the first exhaust guide tube is arranged, perforated with a holes bottom toward the second chamber and a chamber surrounding the perforated sheet metal pot surrounded by insulating material all around.
  • downstream subsequent third chamber is closed by bottoms, in which a further perforated pipe section of the second exhaust pipe is arranged and which is directly surrounded by an insulating material.
  • the further perforated pipe section of the second exhaust pipe is arranged corresponding to a perforated pipe section of the first exhaust pipe in the third chamber of the exhaust gas muffler.
  • the branched-off exhaust-gas flow is introduced into the perforated pipe section of the first exhaust-gas guide pipe via the one perforated pipe section of the second exhaust-gas guide pipe into the inlet opening of the first exhaust-gas guide pipe and the further branched exhaust gas stream via the other perforated pipe section in the third chamber.
  • the drawing shows a section through a Exhaust rear silencer with the two exhaust guide tubes and the individual chambers.
  • the exhaust gas muffler 1 essentially comprises two mufflers S1 and S2, which are arranged separately from one another via a closed bottom 2 and have the same structure, so that only the one muffler is described.
  • the exhaust gas guide tubes 3 of the exhaust gas muffler are each connected to an exhaust port of an internal combustion engine, which is not shown.
  • the exhaust gases are directed in the direction of the arrow through exhaust guide tubes 3 and depending on the position of an exhaust flap 4 in the exhaust pipe 5 through a further exhaust pipe 6.
  • the exhaust gas guide tubes 6 and 3 are substantially held within the exhaust gas muffler 1 in trays 7, 8, 9, which divide the chambers K1, K2 and K3.
  • the first exhaust gas guide tube 6 has an inner mouth opening 10 which lies in the chamber K1 and it extends through the two adjoining chambers K2 and K3 and opens outwards.
  • the second exhaust pipe 3 extends from an outer mouth 20 through the chambers K1, K2 and K3 and also opens out into the exhaust pipe 5 with the inner exhaust valve 4 a.
  • This second exhaust pipe 3 has in the second chamber K2 a perforated, that is provided with holes pipe region R1, which is surrounded by a perforated metal basket 11. This is covered all around with material 12, which extends to the shell 10 of the exhaust gas muffler. Between the perforated pipe region R1 and the metal basket 11, a distance is provided. A subsequent tube region R2 of the exhaust gas guide tube 3 is perforated, that is, executed with holes which are directly surrounded by insulating material 12a. Corresponding with In the same chamber K3, a tube region R3 of the first exhaust gas guide tube 6 is perforated, ie provided with holes, in this tube region R2.

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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 exhaust gas rear silencer (1) has two silencers that are separated from each other, where exhaust gas flows through silencers, which have an exhaust gas inlet and exhaust gas outlet. Two exhaust guide pipes (3, 6) are provided, where the exhaust gas guide pipe (6) has a discharge opening (10) within the exhaust gas rear silencer (1) for forcibly discharging exhaust gas from the exhaust gas guide pipe (3) with a closed exhaust gas blocking flap (4), where the exhaust gases of an internal-combustion engine directly flows into the discharge opening.

Description

Die Erfindung bezieht sich auf einen Abgasnachschalldämpfer für eine Brennkraftmaschine nach dem Oberbegriff des Anspruchs 1.The invention relates to an exhaust gas silencer for an internal combustion engine according to the preamble of claim 1.

Aus der DE 197 43 446 C2 ist eine Abgasanlage für eine Brennkraftmaschine mit einem Nachschalldämpfer bekannt, bei dem ein Gasaustritt aus einem zweiten Schalldämpfer zeitweise verschließbar ist und dass der zweite Schalldämpfer bei geschlossenem Gasaustritt als Resonator dient.From the DE 197 43 446 C2 an exhaust system for an internal combustion engine with a rear silencer is known in which a gas outlet from a second silencer is temporarily closed and that the second silencer serves as a resonator when the gas outlet is closed.

Aufgabe der Erfindung ist es, einen Abgasnachschalldämpfer für ein Kraftfahrzeug zu schaffen, der einen einfach herzustellenden und zusammensetzbaren Aufbau aufweist und welcher in Abhängigkeit von einer Abgasklappenstellung ein gedämpftes oder nicht gedämpftes Abgasgeräusch erzeugt.The object of the invention is to provide an exhaust gas muffler for a motor vehicle, which has a simple to manufacture and assemblable structure and which generates a damped or unattenuated exhaust noise as a function of an exhaust valve position.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Anspruchs 1 gelöst. Weitere vorteilhafte Merkmale beinhalten die Unteransprüche.This object is achieved by the features of claim 1. Further advantageous features include the subclaims.

Die mit der Erfindung hauptsächlich erzielten Vorteile bestehen darin, dass durch den inneren Aufbau des Abgasnachschalldämpfers ein gewünschtes gedämpftes und nicht gedämpftes Abgasgeräusch im Fahrbetrieb durch eine geschlossene oder geöffnete Abgassperrklappe erzeugt werden kann. Diese Geräuschoptimierung erfolgt, indem der Abgasschalldämpfer zwei Abgasführungsrohre umfasst, wobei das erste Abgasführungsrohr innerhalb des Abgasschalldämpfers eine Einmündungsöffnung für zwangsweise austretende Abgase vom zweiten Abgasführungsrohr bei geschlossener Absperrklappe aufweist, in welches die Abgase der Brennkraftmaschine direkt einströmen können.The advantages achieved by the invention are that a desired damped and unattenuated exhaust noise during driving can be generated by a closed or open exhaust flap through the internal structure of the exhaust gas muffler. This noise optimization is carried out by the exhaust muffler comprises two exhaust guide tubes, wherein the first exhaust pipe inside the exhaust muffler has an opening for forced exiting exhaust gases from the second exhaust pipe with the shut-off valve closed, in which the exhaust gases of the internal combustion engine can flow directly.

Damit bei geschlossener Abgassperrklappe ein gedämpftes Abgasgeräusch erzielbar ist, wird das zweite Abgasführungsrohr zur Ableitung von Abgasen bei geschlossener Absperrklappe mit zwei perforierten Rohrabschnitten versehen, die in jeweils einer zweiten und dritten Kammer des Abgasnachschalldämpfers angeordnet sind. Der nunmehr zwangsweise umgelenkte Abgasstrom strömt durch die perforierten Rohrabschnitte des Abgasführungsrohres in der Weise, dass eine erste Kammer des Abgasnachschalldämpfers, in der die Einmündungsöffnung des ersten Abgasführungsrohres angeordnet ist, einen mit Löchern perforierten Boden zur zweiten Kammer hin sowie einen die Kammer umgebenden perforierten Blechtopf aufweist, der von Dämmmaterial rundherum umgeben ist. Des Weiteren ist die stromab anschließende dritte Kammer von Böden abgeschlossen, in der ein weiterer perforierter Rohrabschnitt des zweiten Abgasführungsrohres angeordnet ist und welcher von einem Dämmmaterial unmittelbar umgeben ist. Der weitere perforierte Rohrabschnitt des zweiten Abgasführungsrohres ist korrespondierend mit einem perforierten Rohrabschnitt des ersten Abgasführungsrohres in der dritten Kammer des Abgasnachschalldämpfers angeordnet.In order for a damped exhaust noise to be achieved when the exhaust-gas barrier flap is closed, the second exhaust-gas guide tube is used to discharge exhaust gases when the exhaust gas is closed Provided shut-off valve with two perforated pipe sections, which are arranged in each of a second and third chamber of the exhaust gas muffler. The now forcibly deflected exhaust gas stream flows through the perforated pipe sections of the exhaust pipe in such a way that a first chamber of Abgasnachschalldämpfers in which the mouth opening of the first exhaust guide tube is arranged, perforated with a holes bottom toward the second chamber and a chamber surrounding the perforated sheet metal pot surrounded by insulating material all around. Furthermore, the downstream subsequent third chamber is closed by bottoms, in which a further perforated pipe section of the second exhaust pipe is arranged and which is directly surrounded by an insulating material. The further perforated pipe section of the second exhaust pipe is arranged corresponding to a perforated pipe section of the first exhaust pipe in the third chamber of the exhaust gas muffler.

Bei einer geschlossenen Abgassperrklappe wird der abgezweigte Abgasstrom über den einen perforierten Rohrabschnitt des zweiten Abgasführungsrohres in die Einmündungsöffnung des ersten Abgasführungsrohres und der weitere abgezweigte Abgasstrom über den anderen perforierten Rohrabschnitt in der dritten Kammer in den perforierten Rohrabschnitt des ersten Abgasführungsrohres eingeleitet.In the case of a closed exhaust-gas barrier flap, the branched-off exhaust-gas flow is introduced into the perforated pipe section of the first exhaust-gas guide pipe via the one perforated pipe section of the second exhaust-gas guide pipe into the inlet opening of the first exhaust-gas guide pipe and the further branched exhaust gas stream via the other perforated pipe section in the third chamber.

Durch die Ummantelung mit Dämmmaterial des einen perforierten Rohrabschnitts des Abgasführungsrohres wird eine Schallisolation erzielt. Über das den Blechtopf umgebende Dämmmaterial wird sowohl eine Schallabsorption als auch ein Wärmeschutz in der Weise erzielt, dass keine Verfärbung des Abgasnachschalldämpfers bzw. des Topfes erfolgt.By cladding with insulation material of a perforated pipe section of the exhaust pipe, a sound insulation is achieved. About the sheet metal surrounding the insulating material both a sound absorption and a thermal protection is achieved in such a way that no discoloration of the exhaust gas muffler or the pot takes place.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im Nachfolgenden näher beschrieben. Die Zeichnung zeigt einen Schnitt durch einen Abgasnachschalldämpfer mit den beiden Abgasführungsrohren sowie den einzelnen Kammern.An embodiment of the invention is illustrated in the drawing and will be described in more detail below. The drawing shows a section through a Exhaust rear silencer with the two exhaust guide tubes and the individual chambers.

Der Abgasnachschalldämpfer 1 umfasst im Wesentlichen zwei Schalldämpfer S1 und S2, die über einen geschlossenen Boden 2 getrennt zueinander angeordnet sind und einen gleichen Aufbau aufweisen, so dass nur der eine Schalldämpfer beschrieben wird.The exhaust gas muffler 1 essentially comprises two mufflers S1 and S2, which are arranged separately from one another via a closed bottom 2 and have the same structure, so that only the one muffler is described.

Die Abgasführungsrohre 3 des Abgasnachschalldämpfers sind jeweils mit einem Abgasanschluss einer Brennkraftmaschine verbunden, der nicht dargestellt ist. Die Abgase werden in Pfeilrichtung durch Abgasführungsrohre 3 und je nach Stellung einer Abgassperrklappe 4 im Abgasrohr 5 durch ein weiteres Abgasführungsrohr 6 geleitet.The exhaust gas guide tubes 3 of the exhaust gas muffler are each connected to an exhaust port of an internal combustion engine, which is not shown. The exhaust gases are directed in the direction of the arrow through exhaust guide tubes 3 and depending on the position of an exhaust flap 4 in the exhaust pipe 5 through a further exhaust pipe 6.

Die Abgasführungsrohre 6 und 3 sind innerhalb des Abgasnachschalldämpfers 1 in Böden 7, 8, 9 im Wesentlichen gehalten, welche die Kammern K1, K2 und K3 unterteilen. Das erste Abgasführungsrohr 6 weist eine innere Einmündungsöffnung 10 auf, die in der Kammer K1 liegt und es erstreckt sich durch die beiden anschließenden Kammern K2 und K3 und mündet nach außen aus.The exhaust gas guide tubes 6 and 3 are substantially held within the exhaust gas muffler 1 in trays 7, 8, 9, which divide the chambers K1, K2 and K3. The first exhaust gas guide tube 6 has an inner mouth opening 10 which lies in the chamber K1 and it extends through the two adjoining chambers K2 and K3 and opens outwards.

Das zweite Abgasführungsrohr 3 erstreckt sich von einer äußeren Einmündungsöffnung 20 durch die Kammern K1, K2 und K3 und mündet ebenfalls nach außen in das Abgasrohr 5 mit der innenliegenden Abgassperrklappe 4 ein.The second exhaust pipe 3 extends from an outer mouth 20 through the chambers K1, K2 and K3 and also opens out into the exhaust pipe 5 with the inner exhaust valve 4 a.

Dieses zweite Abgasführungsrohr 3 weist in der zweiten Kammer K2 einen perforierten, das heißt mit Löchern versehenen Rohrbereich R1 auf, der von einem perforierten Blechkorb 11 umgeben ist. Dieser ist rundherum mit Material 12 abgedeckt, welcher sich bis zur Schale 10 des Abgasnachschalldämpfers erstreckt. Zwischen dem perforierten Rohrbereich R1 und dem Blechkorb 11 ist ein Abstand vorgesehen. Ein anschließender Rohrbereich R2 des Abgasführungsrohres 3 ist perforiert, das heißt mit Löchern ausgeführt, die unmittelbar von Dämmmaterial 12a umgeben sind. Korrespondierend mit diesem Rohrbereich R2 ist in der gleichen Kammer K3 ein Rohrbereich R3 des ersten Abgasführungsrohres 6 perforiert, das heißt, mit Löchern versehen.This second exhaust pipe 3 has in the second chamber K2 a perforated, that is provided with holes pipe region R1, which is surrounded by a perforated metal basket 11. This is covered all around with material 12, which extends to the shell 10 of the exhaust gas muffler. Between the perforated pipe region R1 and the metal basket 11, a distance is provided. A subsequent tube region R2 of the exhaust gas guide tube 3 is perforated, that is, executed with holes which are directly surrounded by insulating material 12a. Corresponding with In the same chamber K3, a tube region R3 of the first exhaust gas guide tube 6 is perforated, ie provided with holes, in this tube region R2.

Bei geöffneter Abgassperrklappe 4 (gestrichelt dargestellt) können die Abgase von der Brennkraftmaschine ungedämpft durch die Abgasführungsrohre 3 und 6 nach außen strömen. Bei geschlossener Abgassperrklappe 4 strömen die Abgase dagegen zwangsweise nur über die perforierten Rohrabschnitte R1 und R2 des zweiten Abgasführungsrohres 3 einerseits durch eine mit Löchern 15 versehene Trennwand 7 zwischen den beiden Kammern K1 und K2 zur Einmündungsöffnung 10 und andererseits durch den perforierten Rohrabschnitt R3 des ersten Abgasrohres 6. Gleichzeitig erfolgt über die Abströmung der Abgase durch das Dämmmaterial 12, 12a ein gedämpftes Abgasgeräusch.With the exhaust flap 4 open (shown in phantom), the exhaust gases from the engine can flow unattenuated through the exhaust guide tubes 3 and 6 to the outside. By contrast, with the exhaust flap 4 closed, the exhaust gases forcibly flow only through the perforated pipe sections R1 and R2 of the second exhaust pipe 3 on the one hand through a partition wall 7 provided with holes 15 between the two chambers K1 and K2 to the mouth opening 10 and on the other hand through the perforated pipe section R3 of the first exhaust pipe 6. At the same time takes place on the outflow of exhaust gases through the insulating material 12, 12 a, a muffled exhaust noise.

Claims (6)

Abgasnachschalldämpfer für eine Brennkraftmaschine mit von Abgasen durchströmte erste und zweite Schalldämpfer, die voneinander getrennt sind und jeweils eine Abgaszu- und abführung durch ein Abgasführungsrohr aufweisen, das in ein stromab anschließendes Abgasrohr einmündet, in dem eine zeitweise verschließbare Abgassperrklappe angeordnet ist, dadurch gekennzeichnet, dass der Abgasnachschalldämpfer (1) zwei Abgasführungsrohre (3, 6) umfasst, wobei das erste Abgasführungsrohr (6) innerhalb des Abgasnachschalldämpfers (1) eine Einmündungsöffnung (10) für zwangsweise austretende Abgase vom zweiten Abgasführungsrohr (3) bei geschlossener Abgassperrklappe (4) aufweist, in welches die Abgase der Brennkraftmaschine direkt einströmen.Exhaust rear silencer for an internal combustion engine with exhaust gases flowed through first and second muffler, which are separated and each have an exhaust gas supply and exhaust through an exhaust pipe leading into a downstream exhaust pipe, in which a temporarily closable exhaust gas damper flap is arranged, characterized in that the exhaust gas rear muffler (1) comprises two exhaust gas guide tubes (3, 6), the first exhaust gas guide tube (6) having within the exhaust gas muffler (1) an outlet opening (10) for forcibly exiting exhaust gases from the second exhaust gas guide tube (3) with the exhaust gas barrier flap (4) closed, in which the exhaust gases of the internal combustion engine flow directly. Abgasnachschalldämpfer nach Anspruch 1, dadurch gekennzeichnet, dass das zweite Abgasführungsrohr (3) zur zwangsweisen Ableitung von Abgasen bei geschlossener Abgassperrklappe (4) zwei perforierte Rohrabschnitte (R1, R2) in jeweils einer zweiten und dritten Kammer (K2, K3) des Abgasnachschalldämpfers (1) aufweist.Exhaust rear silencer according to claim 1, characterized in that the second exhaust pipe (3) for the forced discharge of exhaust gases with closed exhaust shutter (4) has two perforated pipe sections (R1, R2) in each of a second and third chamber (K2, K3) of the exhaust rear silencer (1 ) having. Abgasnachschalldämpfer nach den Ansprüchen 1 oder 2, dadurch gekennzeichnet, dass eine erste Kammer (K1) des Abgasnachschalldämpfers (1) in der die Einmündungsöffnung (10) des ersten Abgasführungsrohres (6) angeordnet ist, einen mit Löchern perforierten Boden (7) zur zweiten Kammer (K2) hin sowie einen die Kammer umgebenden perforierten Blechtopf (11) aufweist, der von Dämmmaterial (12) rundherum umgeben ist.Exhaust rear silencer according to claims 1 or 2, characterized in that a first chamber (K1) of the exhaust gas muffler (1) in which the mouth opening (10) of the first exhaust gas guide tube (6) is arranged, perforated with holes bottom (7) to the second chamber (K2) towards and surrounding the chamber perforated sheet metal pot (11) which is surrounded by insulating material (12) all around. Abgasnachschalldämpfer nach den Ansprüchen 1, 2 oder 3, dadurch gekennzeichnet, dass die stromab anschließende dritte Kammer (K3) von Böden (8, 9) abgeschlossen ist, in der ein weiterer perforierter Rohrabschnitt (R2) des zweiten Abgasführungsrohres (3) angeordnet und welcher von einem Dämmmaterial (12a) unmittelbar umschlossen ist.Exhaust rear silencer according to claims 1, 2 or 3, characterized in that the downstream subsequent third chamber (K3) of trays (8, 9) is completed, in which a further perforated pipe section (R2) of the second exhaust pipe (3) is arranged and which is directly enclosed by an insulating material (12a). Abgasnachschalldämpfer nach Anspruch 4, dadurch gekennzeichnet, dass der weitere perforierte Rohrabschnitt (R2) des zweiten Abgasführungsrohres (B) korrespondierend mit einem perforierten Rohrabschnitt (R3) des ersten Abgasführungsrohres (6) in der dritten Kammer (K3) angeordnet ist.Exhaust rear silencer according to claim 4, characterized in that the further perforated pipe section (R2) of the second exhaust pipe (B) is arranged corresponding to a perforated pipe section (R3) of the first exhaust pipe (6) in the third chamber (K3). Abgasnachschalldämpfer nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass bei geschlossener Abgassperrklappe (4) der abgezweigte Abgasstrom über den einen perforierten Rohrabschnitt (R1) des zweiten Abgasführungsrohres (3) in die Einmündungsöffnung (10) des ersten Abgasführungsrohres (6) und der weitere abgezweigte Abgasstrom über den anderen perforierten Rohrabschnitt (R2) in der dritten Kammer (K3) in den perforierten Rohrabschnitt (R2) des ersten Abgasführungsrohres (6) eintritt.Exhaust rear silencer according to one of the preceding claims, characterized in that with the exhaust flap (4) closed the branched off exhaust stream via the one perforated pipe section (R1) of the second exhaust duct (3) in the mouth opening (10) of the first exhaust duct pipe (6) and the other branched Exhaust gas stream via the other perforated pipe section (R2) in the third chamber (K3) in the perforated pipe section (R2) of the first exhaust gas guide tube (6) occurs.
EP07013854A 2006-10-21 2007-07-14 Exhaust gas back muffler Expired - Fee Related EP1914398B1 (en)

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DE102006049786A DE102006049786B4 (en) 2006-10-21 2006-10-21 1 to exhaust rear silencer

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EP (1) EP1914398B1 (en)
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Also Published As

Publication number Publication date
DE102006049786B4 (en) 2013-12-24
US7562741B2 (en) 2009-07-21
EP1914398B1 (en) 2010-01-20
JP2008101622A (en) 2008-05-01
JP5255812B2 (en) 2013-08-07
US20080093161A1 (en) 2008-04-24
DE102006049786A1 (en) 2008-04-24

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