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EP0298379A1 - Exhaust silencer - Google Patents

Exhaust silencer Download PDF

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Publication number
EP0298379A1
EP0298379A1 EP88110513A EP88110513A EP0298379A1 EP 0298379 A1 EP0298379 A1 EP 0298379A1 EP 88110513 A EP88110513 A EP 88110513A EP 88110513 A EP88110513 A EP 88110513A EP 0298379 A1 EP0298379 A1 EP 0298379A1
Authority
EP
European Patent Office
Prior art keywords
exhaust silencer
housing
outlet pipe
exhaust
silencer 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.)
Withdrawn
Application number
EP88110513A
Other languages
German (de)
French (fr)
Inventor
Peter Dipl.-Ing. Krause
Edgar Dipl.-Ing. Neubert (Fh)
Manfred Doll
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.)
PAUL GILLET GmbH
Gillet Paul GmbH
Original Assignee
PAUL GILLET GmbH
Gillet Paul GmbH
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 PAUL GILLET GmbH, Gillet Paul GmbH filed Critical PAUL GILLET GmbH
Publication of EP0298379A1 publication Critical patent/EP0298379A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
    • 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
    • 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
    • F01N1/24—Silencing apparatus characterised by method of silencing by using sound-absorbing materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N2470/00—Structure or shape of exhaust gas passages, pipes or tubes
    • F01N2470/02—Tubes being perforated
    • F01N2470/04—Tubes being perforated characterised by shape, disposition or dimensions of apertures
    • 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 exhaust gas passages, pipes or tubes
    • F01N2470/10—Tubes having non-circular cross section
    • 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
    • F01N2490/15—Plurality of resonance or dead 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
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/15—Plurality of resonance or dead chambers
    • F01N2490/155—Plurality of resonance or dead chambers being disposed one after the other in flow direction
    • 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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/005—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for draining or otherwise eliminating condensates or moisture accumulating in the apparatus

Definitions

  • the invention relates to an exhaust gas silencer, in particular for internal combustion engines in motor vehicles according to the preamble of claim 1.
  • Exhaust silencers of this type are known, for example, from DE-B-32 41 887, DE-A-35 29 010, GB-B-986 576 or GB-B-415 446.
  • Exhaust silencers usually have a closed housing, usually with an oval or round cross-section, which is often divided into chambers by partitions. A standard version is the division into three chambers.
  • the exhaust gases are introduced into the muffler housing via an inlet pipe and led out of the muffler via an outlet pipe. If necessary, both pipes penetrate the partition walls.
  • Every exhaust silencer is to reduce the acoustic energy in the exhaust gases as effectively as possible without excessively braking the exhaust gas flow.
  • the physical phenomena of absorption and reflection are used for this purpose.
  • absorption the pipes carrying the exhaust gases are surrounded by chambers which are filled with absorption material, usually rock or basalt wool, and these are coupled with the help suitable perforations in the pipe walls acoustically. This results in a damping of the high frequencies and thus an improvement in the subjective acoustic impression.
  • absorption the pipes carrying the exhaust gases are surrounded by chambers which are filled with absorption material, usually rock or basalt wool, and these are coupled with the help suitable perforations in the pipe walls acoustically. This results in a damping of the high frequencies and thus an improvement in the subjective acoustic impression.
  • reflection sudden changes in the cross-section of the pipes and chambers are provided in the exhaust gas flow, or suitable resonance spaces are acoustically coupled with the aid of the perforations in the pipes. These per
  • the shape of the muffler housing and the shape of the gas-carrying pipes have an influence on the achievable sound absorption.
  • housings with an oval cross-section have a relatively larger surface area than those with a circular cross-section.
  • the surface is also less rigid due to the lower curvature in sections.
  • Such housings therefore emit more surface noise.
  • Similar conditions also apply to the exhaust pipes. If pipes with a small diameter are used, the sound-emitting surface is reduced. If the pipe diameter is made too small, however, the exhaust gas flow becomes too fast and the coupling to the absorption or reflection spaces deteriorates.
  • the arrangement of the exhaust pipes in the housing has a significant influence on the achievable sound absorption due to the reflection of the sound energy on the inner wall of the housing.
  • the present invention is therefore based on the object of specifying an exhaust muffler of the type mentioned, which requires only a few parts and is therefore light and inexpensive, and which also has simple production methods can be produced.
  • the inlet pipe and / or outlet pipe can be surrounded by a special absorption chamber, which is then covered with absorption material, e.g. B. rock or basalt wool is filled.
  • absorption material e.g. B. rock or basalt wool
  • the inner end of the outlet pipe is lowered to the bottom of the housing.
  • the condensate is created a path between the various chambers so that it can collect under the effect of the exhaust gas pressure in the chamber in which the outlet pipe opens.
  • housing 1 shows a housing 1, usually with a round or oval cross section, of an exhaust silencer.
  • the interior of the housing 1 is divided into three chambers 3, 4, 5 by means of two partition walls 2, which are perforated here. These chambers 3, 4, 5 act as reflection or resonance spaces.
  • an inlet pipe 6 is provided which penetrates the end wall of the housing 1 and both partition walls 2 and whose end 7 is closed in this exemplary embodiment, i. H. is squeezed. Perforations 8, 9 allow the exhaust gases to enter the housing 1 of the exhaust silencer and acoustically couple the chambers 4, 5 to the inlet pipe 6.
  • an outlet pipe 10 is provided, which likewise penetrates an end wall of the housing 1 and both partition walls 2.
  • the inner end 11 of the outlet pipe 10 is open in this embodiment.
  • it is lowered to the bottom of the housing 1 so that the condensate collecting there - the chamber 3 has the lowest exhaust gas back pressure - can be expelled with the exhaust gas flow.
  • Perforations 12 in the outlet pipe 10 acoustically couple the middle chamber 4 to the outlet pipe 10 or the exhaust gas flow.
  • An absorption chamber 14 is filled around the outlet pipe 10, which is filled with absorption material 15.
  • the acoustic coupling of the absorption chamber 15 to the outlet pipe 10 takes place with the aid of longitudinal slots 13 in the pipe wall. These longitudinal slots have the advantage that, even if the absorption material 15 is blown out over time, no whistling noises occur.
  • Inlet tube 6 and outlet tube 10 are partially provided with longitudinal beads 16, 17 and 18, 19, the more precise shape and size of which can be seen in FIG. 2.
  • These longitudinal beads 16 ... 19 initially reduce the cross-section of the pipes 6, 10.
  • the effect of these longitudinal beads on the reduction of the sound energy in the exhaust gases is greater than in the case of cross-sectional jumps of the same magnitude which were made according to the prior art, even though the sound emitting
  • the surface of the pipes 6, 10 is larger than in the case of undeformed pipes with the same exhaust gas-carrying cross-section and although in the area of the longitudinal beads 16 ... 19 the speed of the exhaust gases is accelerated and the coupling through the perforations 8, 9, 12, 13 is thereby deteriorated.
  • inlet pipe and outlet pipe 10 are equipped with identical longitudinal beads 16, 17 and 19, 18, so that both pipes 6, 10 can be manufactured with the same tool.

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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 invention relates to an exhaust silencer for motor vehicles. An inlet tube (6), perforated in sections, and an outlet tube (10), perforated in sections, are located in a closed housing (1), split by separating walls into chambers, if required. The inlet tube (6) and/or outer tube (10) are provided at least partially with longitudinal fins (16, 18) in the region of the perforations (8), two longitudinal fins (16, 18) in each case preferably being located opposite one another. The acoustic effect of these longitudinal fins (16, 18) is better than the cross-sectional change would lead one to expect; the negative effects of the relatively large surface and the increase in the exhaust speed are more than compensated for. <IMAGE>

Description

Die Erfindung betrifft einen Abgasschalldämpfer, insbesondere für Brennkraftmaschinen in Kraftfahrzeugen gemäß dem Oberbegriff des Anspruchs 1.The invention relates to an exhaust gas silencer, in particular for internal combustion engines in motor vehicles according to the preamble of claim 1.

Derartige Abgasschalldämpfer sind beispielsweise bekannt aus der DE-B-32 41 887, der DE-A-35 29 010, der GB-B-986 576 oder der GB-B-415 446.Exhaust silencers of this type are known, for example, from DE-B-32 41 887, DE-A-35 29 010, GB-B-986 576 or GB-B-415 446.

Abgasschalldämpfer besitzen üblicherweise ein geschlossenes Gehäuse, meist mit ovalem oder rundem Querschnitt, das im Inneren oft durch Zwischenwände in Kammern unterteilt ist. Eine Standardausführung ist die Unterteilung in drei Kammern. Die Abgase werden über ein Einlaßrohr in das Schalldämpfergehäuse eingeführt und über ein Auslaßrohr aus diesem wieder herausgeführt. Beide Rohre durchdringen gegebenenfalls die Zwischenwände.Exhaust silencers usually have a closed housing, usually with an oval or round cross-section, which is often divided into chambers by partitions. A standard version is the division into three chambers. The exhaust gases are introduced into the muffler housing via an inlet pipe and led out of the muffler via an outlet pipe. If necessary, both pipes penetrate the partition walls.

Infolge der Abkühlung der heißen Abgase am kalten Schalldämpfergehäuse kondensiert ein Teil der Feuchtigkeit und sammelt sich am Boden des Gehäuses. Um dieses Kondensat, das säurehaltig ist und deshalb eine starke Korrosionswirkung besitzt, aus dem Gehäuse austreiben zu können, ist es bekannt, das Auslaßrohr wenigstens im Bereich seines inneren Endes auf dem Gehäuseboden abzusenken, um das Kondensat mit der Abgasströmung auszublasen.As a result of the cooling of the hot exhaust gases on the cold muffler housing, part of the moisture condenses and collects at the bottom of the housing. In order to be able to drive this condensate, which is acidic and therefore has a strong corrosion effect, out of the housing, it is known to lower the outlet pipe at least in the region of its inner end on the housing base in order to blow out the condensate with the exhaust gas flow.

Aufgabe eines jeden Abgasschalldämpfers ist es, die in den Abgasen steckende akustische Energie möglichst wirksam zu reduzieren, ohne die Abgasströmung übermäßig zu bremsen. Zu diesem Zweck werden die physikalischen Phänomene der Absorption und der Reflexion eingesetzt. Zum Zweck der Absorption umgibt man die die Abgase führenden Rohre mit Kammern, die mit Absorptionsmaterial, meist Stein- oder Basaltwolle, gefüllt sind, und koppelt diese mit Hilfe geeigneter Perforationen in den Rohrwänden akustisch an. Hierdurch erreicht man eine Dämpfung der hohen Frequenzen und damit eine Verbesserung des subjektiven akustischen Eindrucks. Zum Zweck der Reflexion sieht man im Abgasstrom möglichst sprunghafte Querschnittsveränderungen der Rohre und Kammern vor oder koppelt geeignete Resonanzräume mit Hilfe der Perforationen in den Rohren akustisch an. Diese Perforationen sind üblicherweise als runde Löcher, in Sonderfällen jedoch auch als Längsschlitze ausgeführt.The task of every exhaust silencer is to reduce the acoustic energy in the exhaust gases as effectively as possible without excessively braking the exhaust gas flow. The physical phenomena of absorption and reflection are used for this purpose. For the purpose of absorption, the pipes carrying the exhaust gases are surrounded by chambers which are filled with absorption material, usually rock or basalt wool, and these are coupled with the help suitable perforations in the pipe walls acoustically. This results in a damping of the high frequencies and thus an improvement in the subjective acoustic impression. For the purpose of reflection, sudden changes in the cross-section of the pipes and chambers are provided in the exhaust gas flow, or suitable resonance spaces are acoustically coupled with the aid of the perforations in the pipes. These perforations are usually designed as round holes, but in special cases also as longitudinal slots.

Es ist bekannt, daß die Form des Schalldämpfergehäuses und die Form der gasführenden Rohre Einfluß auf die erreichbare Schalldämpfung haben. So haben beispielsweise Gehäuse mit ovalem Querschnitt eine verhältnismäßig größere Oberfläche als solche mit kreisrundem Querschnitt. Auch ist die Oberfläche wegen der abschnittsweise geringeren Krümmung weniger steif. Solche Gehäuse strahlen deshalb mehr Oberflächenschall ab. Ähnliche Verhältnisse herrschen auch bei den abgasführenden Rohren. Verwendet man Rohre mit kleinem Durchmesser, verringert sich die schallabstrahlende Oberfläche. Macht man den Rohrdurchmesser jedoch zu klein, wird die Abgasströmung zu schnell und die Ankopplung an die Absorptions- bzw. Reflexionsräume verschlechtert sich. Schließlich hat auch die Anordnung der abgasführenden Rohre im Gehäuse einen erheblichen Einfluß auf die erreichbare Schalldämpfung aufgrund der Reflexion der Schallenergie an der Innenwand des Gehäuses.It is known that the shape of the muffler housing and the shape of the gas-carrying pipes have an influence on the achievable sound absorption. For example, housings with an oval cross-section have a relatively larger surface area than those with a circular cross-section. The surface is also less rigid due to the lower curvature in sections. Such housings therefore emit more surface noise. Similar conditions also apply to the exhaust pipes. If pipes with a small diameter are used, the sound-emitting surface is reduced. If the pipe diameter is made too small, however, the exhaust gas flow becomes too fast and the coupling to the absorption or reflection spaces deteriorates. Finally, the arrangement of the exhaust pipes in the housing has a significant influence on the achievable sound absorption due to the reflection of the sound energy on the inner wall of the housing.

Die derzeit bestehenden Vorschriften bezüglich der Reduzierung des von den Verbrennungsmotoren von Kraftfahrzeugen erzeugten Lärms bedingen einen erheblichen mechanischen Aufwand bei der Konstruktion der Abgasschalldämpfer. Der vorliegenden Erfindung liegt deshalb die Aufgabe zugrunde, einen Abgasschalldämpfer der eingangs genannten Art anzugeben, der nur wenige Teile benötigt und daher leicht und preiswert ist, und der gleichzeitig mit einfachen Produktionsmethoden herstellbar ist.The current regulations regarding the reduction of noise generated by the internal combustion engines of motor vehicles require considerable mechanical effort in the construction of the exhaust silencers. The present invention is therefore based on the object of specifying an exhaust muffler of the type mentioned, which requires only a few parts and is therefore light and inexpensive, and which also has simple production methods can be produced.

Diese Aufgabe wird gelöst durch die kennzeichnenden Merkmale des Anspruchs 1.This object is achieved by the characterizing features of claim 1.

Die Herstellung derartiger Längssicken in Einlaßrohr bzw. Auslaßrohr, besonders wenn sie gemäß einer bevorzugten Ausgestaltung der Erfindung sich jeweils paarweise gegenüberliegen, ist einfach. Überraschenderweise hat sich gezeigt, daß die akustische Wirkung dieser Längssicken größer ist als angesichts der Querschnittsveränderung zu erwarten war und die negativen Auswirkungen einer relativ großen Rohroberfläche und der Abgasgeschwindigkeitsvergrößerung überkompensiert. Offensichtlich beeinflussen diese Längssicken die akustischen Eigenschaften der Rohre und damit des ganzen Abgasschalldämpfers positiv.The production of such longitudinal beads in the inlet pipe or outlet pipe, especially if they are in pairs in accordance with a preferred embodiment of the invention, is simple. Surprisingly, it has been shown that the acoustic effect of these longitudinal beads is greater than was to be expected in view of the change in cross section and more than compensates for the negative effects of a relatively large pipe surface area and the increase in exhaust gas velocity. Obviously, these longitudinal beads have a positive effect on the acoustic properties of the pipes and thus of the entire exhaust silencer.

Gemäß einer Ausgestaltung der Erfindung können Einlaßrohr und/ oder Auslaßrohr von einer speziellen Absorptionskammer umgeben sein, die dann mit Absorptionsmaterial, z. B. Stein- oder Basaltwolle, gefüllt ist. In diesem Fall empfiehlt es sich, die Perforationen im Rohr, über die die Absorptionskammer akustisch an den Abgasstrom angekoppelt wird, als Längsschlitze auszubilden, um für den Fall, daß das Absorptionsmaterial im Laufe der Zeit ausgeblasen wird, Pfeifgeräusche zu vermeiden.According to one embodiment of the invention, the inlet pipe and / or outlet pipe can be surrounded by a special absorption chamber, which is then covered with absorption material, e.g. B. rock or basalt wool is filled. In this case, it is advisable to design the perforations in the pipe, via which the absorption chamber is acoustically coupled to the exhaust gas flow, as longitudinal slots, in order to avoid whistling noises in the event that the absorption material is blown out over time.

Um das sich im Gehäuse des Abgasschalldämpfers sammelnde Kondensat mit Hilfe der Abgasströmung austreiben zu können, wird das innere Ende des Auslaßrohrs auf den Boden des Gehäuses abgesenkt. Mit Hilfe von Spaltöffnungen, die in den Zwischenwänden im Bereich des Bodens des Gehäuses angeordnet sind, wird dem Kondensat ein Weg zwischen den verschiedenen Kammern geschaffen, so daß es sich unter der Wirkung des Abgasdrucks in der Kammer sammeln kann, in der das Auslaßrohr mündet.In order to be able to expel the condensate collecting in the housing of the exhaust muffler with the aid of the exhaust gas flow, the inner end of the outlet pipe is lowered to the bottom of the housing. With the help of stomata, which are arranged in the intermediate walls in the region of the bottom of the housing, the condensate is created a path between the various chambers so that it can collect under the effect of the exhaust gas pressure in the chamber in which the outlet pipe opens.

Anhand der Zeichnung soll die Erfindung in Form eines Ausführungsbeispiels näher erläutert werden. Es zeigen

  • Fig. 1 eine Draufsicht auf einen Abgasschalldämpfer mit aufgeschnittenem Gehäuse und
  • Fig. 2 einen Querschnitt entlang der Linie II-II in Fig. 1.
The invention will be explained in more detail in the form of an exemplary embodiment with reference to the drawing. Show it
  • Fig. 1 is a plan view of an exhaust silencer with a cut housing and
  • FIG. 2 shows a cross section along the line II-II in FIG. 1.

In Fig. 1 erkennt man ein Gehäuse 1, üblicherweise mit rundem oder ovalem Querschnitt, eines Abgasschalldämpfers. Das Innere des Gehäuses 1 ist mit Hilfe von zwei Trennwänden 2, die hier perforiert sind, in drei Kammern 3,4,5 unterteilt. Diese Kammern 3,4,5 wirken als Reflexions- bzw. Resonanzräume.1 shows a housing 1, usually with a round or oval cross section, of an exhaust silencer. The interior of the housing 1 is divided into three chambers 3, 4, 5 by means of two partition walls 2, which are perforated here. These chambers 3, 4, 5 act as reflection or resonance spaces.

Um die von der Verbrennungskraftmaschine kommenden Abgase in das Gehäuse 1 einführen zu können, ist ein Einlaßrohr 6 vorgesehen, welches die Stirnwand des Gehäuses 1 und beide Trennwände 2 durchstößt und dessen Ende 7 in diesem Ausführungsbeispiel verschlossen, d. h. zugequetscht ist. Perforationen 8,9 ermöglichen den Eintritt der Abgase in das Gehäuse 1 des Abgasschalldämpfers und koppeln die Kammern 4,5 akustisch an das Einlaßrohr 6 an.In order to be able to introduce the exhaust gases coming from the internal combustion engine into the housing 1, an inlet pipe 6 is provided which penetrates the end wall of the housing 1 and both partition walls 2 and whose end 7 is closed in this exemplary embodiment, i. H. is squeezed. Perforations 8, 9 allow the exhaust gases to enter the housing 1 of the exhaust silencer and acoustically couple the chambers 4, 5 to the inlet pipe 6.

Um die Abgase aus dem Gehäuse 1 wieder herausführen zu können, ist ein Auslaßrohr 10 vorgesehen, das ebenfalls eine Stirnwand des Gehäuses 1 und beide Trennwände 2 durchstößt. Das innere Ende 11 des Auslaßrohrs 10 ist in diesem Ausführungsbeispiel offen. Außerdem ist es auf den Boden des Gehäuses 1 abgesenkt, um das sich dort sammelnde Kondensat - die Kammer 3 hat den geringsten Abgasgegendruck - mit der Abgasströmung austreiben zu können. Perforationen 12 im Auslaßrohr 10 koppeln die Mittelkammer 4 an das Auslaßrohr 10 bzw. die Abgasströmung akustisch an.In order to be able to lead the exhaust gases out of the housing 1 again, an outlet pipe 10 is provided, which likewise penetrates an end wall of the housing 1 and both partition walls 2. The inner end 11 of the outlet pipe 10 is open in this embodiment. In addition, it is lowered to the bottom of the housing 1 so that the condensate collecting there - the chamber 3 has the lowest exhaust gas back pressure - can be expelled with the exhaust gas flow. Perforations 12 in the outlet pipe 10 acoustically couple the middle chamber 4 to the outlet pipe 10 or the exhaust gas flow.

Um das Auslaßrohr 10 ist bereichsweise eine Absorptionskammer 14 herumgelegt, die mit Absorptionsmaterial 15 gefüllt ist. Die akustische Ankopplung der Absorptionskammer 15 an das Auslaßrohr 10 erfolgt mit Hilfe von Längsschlitzen 13 in der Rohrwandung. Diese Längsschlitze haben den Vorteil, daß auch dann, wenn das Absorptionsmaterial 15 im Laufe der Zeit ausgeblasen wird, keine Pfeifgeräusche auftreten.An absorption chamber 14 is filled around the outlet pipe 10, which is filled with absorption material 15. The acoustic coupling of the absorption chamber 15 to the outlet pipe 10 takes place with the aid of longitudinal slots 13 in the pipe wall. These longitudinal slots have the advantage that, even if the absorption material 15 is blown out over time, no whistling noises occur.

Einlaßrohr 6 und Auslaßrohr 10 sind partiell mit Längssicken 16, 17 bzw. 18, 19 versehen, deren genauere Form und Größe sich aus Fig. 2 ergibt. Diese Längssicken 16...19 bewirken zunächst eine Querschnittsverringerung der Rohre 6, 10. Die Wirkung dieser Längssicken auf die Reduzierung der Schallenergie in den Abgasen ist jedoch größer als bei gleich starken Querschnittssprüngen, die nach dem Stand der Technik vorgenommen wurden, obwohl die schallabstrahlende Oberfläche der Rohre 6, 10 größer ist als bei unverformten Rohren mit gleichem abgasführendem Querschnitt und obwohl im Bereich der Längssicken 16... 19 die Geschwindigkeit der Abgase beschleunigt und dadurch die Ankopplung durch die Perforationen 8, 9, 12, 13 verschlechtert wird. Diese die Schalldämpfung verschlechternden Effekte werden offensichtlich weit überkompensiert durch positive Effekte, beispielsweise die größere Zahl von anbringbaren Perforationen und die diffusere Schallabstrahlung, die offensichtlich gerichtete Reflexionen an der Innenwand des Schalldämpfergehäuses 1 wirksam verhindert. Jedenfalls ist es mit der in der Zeichnung dargestellten einfachen Konstruktion mit nur zwei Rohren möglich, die bestehenden Vorschriften der Schalldämpfung zu erfüllen.Inlet tube 6 and outlet tube 10 are partially provided with longitudinal beads 16, 17 and 18, 19, the more precise shape and size of which can be seen in FIG. 2. These longitudinal beads 16 ... 19 initially reduce the cross-section of the pipes 6, 10. However, the effect of these longitudinal beads on the reduction of the sound energy in the exhaust gases is greater than in the case of cross-sectional jumps of the same magnitude which were made according to the prior art, even though the sound emitting The surface of the pipes 6, 10 is larger than in the case of undeformed pipes with the same exhaust gas-carrying cross-section and although in the area of the longitudinal beads 16 ... 19 the speed of the exhaust gases is accelerated and the coupling through the perforations 8, 9, 12, 13 is thereby deteriorated. These effects which impair sound absorption are obviously far overcompensated by positive effects, for example the larger number of perforations which can be attached and the more diffuse sound radiation which effectively prevents obviously directed reflections on the inner wall of the muffler housing 1. In any case, with the simple construction shown in the drawing with only two pipes, it is possible to meet the existing regulations for sound insulation.

Schließlich ist noch darauf hinzuweisen, daß Einlaßrohr und Auslaßrohr 10 mit identischen Längssicken 16,17 bzw. 19,18 ausgerüstet sind, so daß beide Rohre 6,10 mit demselben Werkzeug gefertigt werden können.Finally, it should be pointed out that the inlet pipe and outlet pipe 10 are equipped with identical longitudinal beads 16, 17 and 19, 18, so that both pipes 6, 10 can be manufactured with the same tool.

Claims (8)

1. Abgasschalldämpfer, insbesondere für Brennkraftmaschinen in Kraftfahrzeugen, mit einem geschlossenen, gegebenenfalls durch Zwischenwände (2) in Kammern (3, 4, 5) unterteilten Gehäuse (1), mit einem abschnittsweise perforierten Einlaßrohr (6) und mit einem abschnittsweise perforierten Auslaßrohr (10), wobei bei Bedarf der Raum um Einlaßrohr (6) bzw. Auslaßrohr (10) wenigstens teilweise mit Absorptionsmaterial (15) gefüllt ist, dadurch gekennzeichnet, daß Einlaßrohr (6) und/oder Auslaßrohr (10) im Bereich der Perforationen (8) wenigstens partiell mit Längssicken (16,17,18,19) versehen sind.1. Exhaust silencer, in particular for internal combustion engines in motor vehicles, with a closed housing (1), which may be divided into compartments (3, 4, 5) by partitions (2), with a partially perforated inlet pipe (6) and with a partially perforated outlet pipe ( 10), the space around the inlet pipe (6) or outlet pipe (10) being at least partially filled with absorption material (15), characterized in that the inlet pipe (6) and / or outlet pipe (10) in the region of the perforations (8 ) are at least partially provided with longitudinal beads (16, 17, 18, 19). 2. Abgasschalldämpfer nach Anspruch 1, dadurch gekennzeichnet, daß jeweils zwei Längssicken (16 ... 19) sich gegenüberliegen.2. Exhaust silencer according to claim 1, characterized in that two longitudinal beads (16 ... 19) are opposite each other. 3. Abgasschalldämpfer nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Einlaßrohr (6) und/oder das Auslaßrohr (10) von einer Absorptionskammer (14) umgeben ist, die mit Absorptionsmaterial (15), z. B. Steinwolle, gefüllt ist.3. Exhaust silencer according to claim 1 or 2, characterized in that the inlet pipe (6) and / or the outlet pipe (10) is surrounded by an absorption chamber (14) which with absorption material (15), for. B. rock wool is filled. 4. Abgasschalldämpfer nach Anspruch 3, dadurch gekennzeichnet, daß die Perforationen im Bereich der Absorptionskammer (14) als Längsschlitze (13) ausgebildet sind.4. Exhaust silencer according to claim 3, characterized in that the perforations in the region of the absorption chamber (14) are designed as longitudinal slots (13). 5. Abgasschalldämpfer nach wenigstens einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das innere Ende (11) des Auslaßrohrs (10) auf den Boden des Gehäuses (1) abgesenkt ist.5. Exhaust silencer according to at least one of claims 1 to 4, characterized in that the inner end (11) of the outlet pipe (10) is lowered to the bottom of the housing (1). 6. Abgasschalldämpfer nach wenigstens einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Zwischenwände (2) im Bereich des Bodens des Gehäuses (1) Spaltöffnungen für das Kondensat aufweisen.6. Exhaust silencer according to at least one of claims 1 to 5, characterized in that the partition walls (2) in Area of the bottom of the housing (1) have stomata for the condensate. 7. Abgasschalldämpfer nach wenigstens einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Zwischenwände (2) perforiert sind.7. Exhaust silencer according to at least one of claims 1 to 6, characterized in that the intermediate walls (2) are perforated. 8. Abgasschalldämpfer nach wenigstens einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß das Ende (7) des Einlaßrohrs (6) geschlossen, insbesondere zugequetscht ist.8. Exhaust silencer according to at least one of claims 1 to 7, characterized in that the end (7) of the inlet pipe (6) is closed, in particular squeezed.
EP88110513A 1987-07-10 1988-07-01 Exhaust silencer Withdrawn EP0298379A1 (en)

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DE8709527U 1987-07-10
DE8709527U DE8709527U1 (en) 1987-07-10 1987-07-10 Exhaust silencer

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2643677A1 (en) * 1989-02-24 1990-08-31 Gilardini Spa SILENCER FOR AN EXHAUST SYSTEM OF A VEHICLE
EP0625632A1 (en) * 1993-05-18 1994-11-23 Roth-Technik Gmbh Exhaust gas silencer
US7004283B2 (en) * 2000-04-14 2006-02-28 J. Eberspächer GmbH & Co. KG Multiple-chambered exhaust muffler
JP2016186294A (en) * 2015-03-27 2016-10-27 株式会社クボタ Exhaust treatment device for engine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8709527U1 (en) * 1987-07-10 1987-10-15 Paul Gillet Gmbh, 6732 Edenkoben Exhaust silencer

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US2138477A (en) * 1937-10-15 1938-11-29 Noblitt Sparks Ind Inc Muffler
US3263772A (en) * 1964-06-17 1966-08-02 Arvin Ind Inc Sound attenuating gas conduit with one-quarter wave-length side branch chambers
US3276108A (en) * 1964-02-21 1966-10-04 Reynolds Metals Co Method of making a muffler
DE1251082B (en) * 1967-09-28 Fa J Eberspacher, Eßlmgen/ Neckar Gas-conducting pipe of silencers
FR2363696A1 (en) * 1976-08-31 1978-03-31 Nihon Radiator Co Exhaust silencer for IC engine - has longitudinal division with inlet and discharge pipes opening in opposite compartments
DE3012876A1 (en) * 1980-04-02 1981-10-08 Fa. J. Eberspächer, 7300 Esslingen Exhaust silencer for land vehicles - has three compartments linked to give resonant passages of different lengths for multiple action
US4371053A (en) * 1980-03-17 1983-02-01 Hills Industrie Limited Perforate tube muffler
EP0168365A1 (en) * 1984-06-27 1986-01-15 Donaldson Company, Inc. Muffler apparatus
US4580657A (en) * 1983-06-16 1986-04-08 Donaldson Company, Inc. Integral fluted tube for sound suppression and exhaust ejection
US4589517A (en) * 1983-11-30 1986-05-20 Saikei Giken Kogyo Kabushiki Kaisha Muffler
DE8709527U1 (en) * 1987-07-10 1987-10-15 Paul Gillet Gmbh, 6732 Edenkoben Exhaust silencer

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1251082B (en) * 1967-09-28 Fa J Eberspacher, Eßlmgen/ Neckar Gas-conducting pipe of silencers
US1701397A (en) * 1925-09-16 1929-02-05 Gen Motors Corp Muffler
US2084435A (en) * 1936-02-03 1937-06-22 Oldberg Mfg Co Condensate eliminating means for silencers
US2138477A (en) * 1937-10-15 1938-11-29 Noblitt Sparks Ind Inc Muffler
US3276108A (en) * 1964-02-21 1966-10-04 Reynolds Metals Co Method of making a muffler
US3263772A (en) * 1964-06-17 1966-08-02 Arvin Ind Inc Sound attenuating gas conduit with one-quarter wave-length side branch chambers
FR2363696A1 (en) * 1976-08-31 1978-03-31 Nihon Radiator Co Exhaust silencer for IC engine - has longitudinal division with inlet and discharge pipes opening in opposite compartments
US4371053A (en) * 1980-03-17 1983-02-01 Hills Industrie Limited Perforate tube muffler
DE3012876A1 (en) * 1980-04-02 1981-10-08 Fa. J. Eberspächer, 7300 Esslingen Exhaust silencer for land vehicles - has three compartments linked to give resonant passages of different lengths for multiple action
US4580657A (en) * 1983-06-16 1986-04-08 Donaldson Company, Inc. Integral fluted tube for sound suppression and exhaust ejection
US4589517A (en) * 1983-11-30 1986-05-20 Saikei Giken Kogyo Kabushiki Kaisha Muffler
EP0168365A1 (en) * 1984-06-27 1986-01-15 Donaldson Company, Inc. Muffler apparatus
DE8709527U1 (en) * 1987-07-10 1987-10-15 Paul Gillet Gmbh, 6732 Edenkoben Exhaust silencer

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2643677A1 (en) * 1989-02-24 1990-08-31 Gilardini Spa SILENCER FOR AN EXHAUST SYSTEM OF A VEHICLE
EP0625632A1 (en) * 1993-05-18 1994-11-23 Roth-Technik Gmbh Exhaust gas silencer
US7004283B2 (en) * 2000-04-14 2006-02-28 J. Eberspächer GmbH & Co. KG Multiple-chambered exhaust muffler
JP2016186294A (en) * 2015-03-27 2016-10-27 株式会社クボタ Exhaust treatment device for engine

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