EP1785602B1 - Silencieux - Google Patents

Silencieux Download PDF

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Publication number
EP1785602B1
EP1785602B1 EP06122631A EP06122631A EP1785602B1 EP 1785602 B1 EP1785602 B1 EP 1785602B1 EP 06122631 A EP06122631 A EP 06122631A EP 06122631 A EP06122631 A EP 06122631A EP 1785602 B1 EP1785602 B1 EP 1785602B1
Authority
EP
European Patent Office
Prior art keywords
branch
resonator
pipe
housing
chamber
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.)
Revoked
Application number
EP06122631A
Other languages
German (de)
English (en)
Other versions
EP1785602A1 (fr
Inventor
Thomas Uhlemann
Rolf Dr. Jebasinski
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
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Application filed by J Eberspaecher GmbH and Co KG filed Critical J Eberspaecher GmbH and Co KG
Publication of EP1785602A1 publication Critical patent/EP1785602A1/fr
Application granted granted Critical
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Revoked 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
    • F01N1/02—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
    • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
    • F01N1/023—Helmholtz resonators
    • 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

Definitions

  • the present invention relates to a silencer for an exhaust system of an internal combustion engine, in particular in a motor vehicle, having the features of the preamble of claim 1.
  • the invention also relates to an exhaust system equipped with such a silencer.
  • Silencers are well known in exhaust systems of internal combustion engines and regularly serve to reduce the noise emission of the internal combustion engine.
  • silencers which work with a Helmholtz resonator.
  • a Helmholtz resonator has a resonator chamber, which is coupled via a connecting tube, the so-called resonator neck, with the sound source to be damped.
  • the Helmholtz resonator acts in the manner of a spring-mass oscillator whose "spring” is formed by the volume of the resonator and whose "mass” is determined by the volume of the Resonatorhalses.
  • the spring-mass oscillator or the Helmholtz resonator has a resonant frequency at which the damping effect with respect to airborne sound is particularly pronounced.
  • Silencers that work with a Helmholtz resonator are regularly limited in their damping effect on a relatively narrow frequency range. Furthermore As a rule, the production of such silencers is comparatively complex.
  • a muffler for an exhaust system of an internal combustion engine which contains a plurality of separate resonator chambers in a housing.
  • several branch pipes branch off from an exhaust-carrying pipe in a branch section, which branches open in different resonator chambers.
  • the resonator chambers form with the respective associated branch pipe Helmholtz resonators, which have different resonance frequencies.
  • Such a silencer is based on the general idea of forming a plurality of resonator chambers in a single housing of the silencer and branching off a plurality of branch pipes from a common, exhaust-carrying pipe in a single branching section, which discharge into different resonator chambers.
  • the muffler has a plurality of Helmholtz resonators, which are each formed by a resonator and a branch pipe as a resonator neck, said Helmholtz resonators are designed so that they have different resonance frequencies.
  • the muffler can thus attenuate at least two different frequencies or frequency ranges.
  • the muffler according to the invention is also characterized by a comparatively simple Structure and thus by a relatively inexpensive manufacturability.
  • the present invention is concerned with the problem of specifying for a silencer of the type mentioned or for an exhaust system equipped therewith an improved embodiment, which is characterized in particular by an improved damping effect or by a simplified manufacturability.
  • the invention is based on the general idea to additionally arrange an absorption chamber in the housing, such that it encloses a longitudinal portion of the tube and communicates with it.
  • an absorption chamber in the housing, such that it encloses a longitudinal portion of the tube and communicates with it.
  • high-frequency or higher-frequency noise components can be damped.
  • the overall damping effect of the muffler can be improved.
  • the exhaust-carrying pipe can be passed through the housing and / or through at least one or through all resonator chambers.
  • One or more or all branch pipes can run within the housing or by one or be passed through a plurality of resonator chambers.
  • the individual resonator chambers can be arranged one behind the other in a longitudinal direction of the housing and, in particular, have identical cross sections along this longitudinal direction.
  • the branch section, in which all branch pipes branch off from the exhaust-carrying pipe, can be arranged completely within one of the resonator chambers.
  • Fig. 1 and 2 includes an exhaust system 1, at least one exhaust line 2, in which a silencer 3 is integrated.
  • the exhaust system 1 belongs to an internal combustion engine, not shown, and serves for discharging exhaust gases during operation of the internal combustion engine.
  • the internal combustion engine is arranged together with the exhaust system 1 in a motor vehicle.
  • the muffler 3 has an exhaust pipe leading tube 4, which is connected in the assembled state of the muffler 3 to the tubular exhaust line 2 and is involved in this.
  • the exhaust gases of the internal combustion engine are thus passed through the pipe 4.
  • the tube 4 extends in a straight line.
  • the muffler 3 also has a housing 5.
  • the tube 4 extends through the housing 5 through, so it enters at unspecified axial end faces in the housing 5 and from it.
  • the tube 4 in the housing 5 is arranged so that it is radially spaced along its entire circumference by an unspecified, lying between the end faces of the casing 5.
  • the housing 5 contains at least two resonator chambers; in the embodiment shown, three resonator chambers, namely a first resonator chamber 6, a second resonator chamber 7 and a third resonator chamber 8 are provided by way of example. In principle, more than three resonator chambers can also be accommodated in the housing 5.
  • the individual resonator chambers 6, 7, 8 are separated from each other and are preferably sealed gas-tight against each other.
  • the resonator chambers 6, 7, 8 with respect to a longitudinal direction of the housing 5, which is preferably parallel to the longitudinal direction of the tube 4, axially arranged one behind the other.
  • the second resonator chamber 7 is arranged axially between the first resonator chamber 6 and the third resonator chamber 8.
  • partition walls For the axial separation of adjacent resonator chambers 6, 7, 8 partition walls, namely a first partition wall 9 for separating the first resonator 6 of the second resonator 7 and a second partition 10 for separating the second resonator 7 of the third resonator chamber 8 are provided.
  • the partitions 9, 10 are preferably designed and arranged in the housing 5, that they separate the respectively adjacent resonator chambers 6, 7, 8 gas-tight from each other.
  • the tube 4 is passed through the partitions 9, 10, including the partitions 9, 10 corresponding, unspecified passage openings.
  • the partitions 9, 10 extend parallel to each other and parallel to the axial end faces of the housing 5. In this way, the tube 4 is simultaneously passed through all the resonator chambers 6, 7, 8.
  • the muffler 3 is also equipped with a plurality of branch pipes, here with three branch pipes, namely a first branch pipe 11, a second branch pipe 12 and a third branch pipe 13.
  • branch pipes 11, 12, 13 are provided as resonator chambers 6, 7, 8.
  • Each branch pipe 11, 12, 13 branches off from the pipe 4 in an axially limited branch section 14 of the pipe 4.
  • Each branch pipe 11, 12, 13 is open at its end remote from the branch section 14.
  • each branch pipe 11, 12, 13 opens into another resonator chamber 6, 7, 8.
  • the first branch pipe 11 opens in the first resonator chamber 6.
  • the second branch pipe 12 opens in the second resonator chamber 7 and the third branch pipe 13 opens into the third resonator 8.
  • three Helmholtz resonators are formed, each consisting of exactly one resonator 6, 7, 8 and exactly one branch pipe 11, 12, 13 as Resonatorhals ,
  • the three Helmholtz resonators of the silencer 3 shown are designated according to their components with 6-11, 7-12 and 8-13.
  • the three Helmholtz resonators 6-11, 7-12, 8-13 have different resonance frequencies, so that the silencer 3 can attenuate three different frequencies or frequency ranges in the present case.
  • the branch pipes 11, 12, 13 are disposed completely within the housing 5, preferably circumferentially spaced in the radial direction to the shell of the housing 5.
  • the branch portion 14 is preferably disposed entirely within the housing 5.
  • the branch section 14 is arranged completely within one of the resonator chambers, here in the first resonator chamber 6. Accordingly, the second branch pipe 12 extends through the first resonator chamber 6 to open in the second resonator chamber 7.
  • the third branch pipe 13 extends through the first resonator chamber 6 and through the second resonator chamber 7 to open in the third resonator chamber 8. Accordingly, the second branch pipe 12 is passed through the first partition wall 9, while the third branch pipe 13 is passed through both partition walls 9, 10.
  • the individual branch pipes 11, 12, 13 go in Branch portion 14 substantially radially from the pipe 4 from.
  • the individual branch pipes 11, 12, 13 branch off in the branching section 14 in the circumferential direction of the pipe 4, ie distributed in the circumferential direction, in each case separately from the pipe 4.
  • the first branch pipe 11 has a straight, relative to the tube 4 radial course
  • the second branch pipe 12 and the third branch pipe 13 are angled by about 90 ° ,
  • These two branch pipes 12, 13 thus have an unspecified radial section and an unspecified axial section.
  • the respective radial section extends in a straight line from the branch section 14 with respect to the tube 4 in the radial direction and merges within the first resonator chamber 6 via a 90 ° bend into the axial section which extends parallel to the longitudinal direction of the tube 4.
  • the three Helmholtz resonators 6-11, 7-12, 8-13 have different resonance frequencies, they may differ from one another with respect to the volumes of the resonator chambers 6, 7, 8 and / or the branch pipes 11, 12, 13.
  • the three branch pipes 11, 12, 13 are of different lengths and also provided with different cross sections.
  • the resonator chambers 6, 7, 8 have the same cross-sections with respect to the longitudinal direction of the housing 5. In order nevertheless to achieve different volumes for the resonator chambers 6, 7, 8, they can have different axial extensions in the housing longitudinal direction exhibit.
  • the first resonator chamber 6 in the housing longitudinal direction is longer than the other two resonator chambers 7, 8.
  • the volumes of the second resonator chamber 7 and the third resonator chamber 8 are approximately equal.
  • the muffler 3 also has an absorption chamber 15 which communicates with the pipe 4.
  • the absorption chamber 15 is arranged in the housing 5.
  • a sleeve 16 is provided, which is preferably arranged in the housing 5 so that it encloses the tube 4 axially parallel, preferably concentrically, in a longitudinal section. In this way, the absorption chamber 15 is formed radially between the tube 4 and the sleeve 16.
  • the sleeve 16 is closed at its axial ends with unspecified bottoms, through which the tube 4 is passed.
  • the sleeve 16 is dimensioned and arranged with respect to the tube 4 so that the absorption chamber 15 in the longitudinal section completely envelops the tube 4 in the circumferential direction. Furthermore, the sleeve 16 is preferably dimensioned and arranged in the housing 5 such that it does not touch the jacket of the housing 5.
  • the sleeve 16 and thus the absorption chamber 15 are in the present case in the axial direction, ie in the longitudinal direction of the tube 4 and in the longitudinal direction of the housing 5 dimensioned so that they extend through both partitions 9, 10.
  • the absorption chamber 15 or the sleeve 16 extends through the second resonator chamber 7 and into the first resonator chamber 6 on the one hand and into the third resonator chamber 8 on the other hand.
  • the pipe 4 is designed to be permeable to airborne sound in the longitudinal section enveloped by the absorption chamber 15. This is achieved by way of example by means of a perforation 17, which may be formed by a plurality of individual holes 18, for example.
  • the absorption chamber 15 is sealed gas-tight with respect to the resonator chambers 6, 7, 8. With the help of the absorption chamber 15 high-frequency or higher-frequency noise components can be damped.
  • the absorption chamber 15 may be filled with a suitable absorption material 19.
  • the tube 4, the sleeve 16 and the branch pipes 12, 13 are inserted through the axial end faces of the housing 5 or through the partitions 9, 10 or through the bottoms of the sleeve 16, in particular gas-tight connections possible are.
  • at least partially sliding seats may be provided to compensate for thermally induced expansion effects can. Such sliding seats can be realized sufficiently gas-tight.
  • the individual components of the muffler 3, in particular the tube 4, the sleeve 16, the branch pipes 11, 12, 13, the housing 5 and the partitions 9, 10 are preferably made of metal, in particular steel or stainless steel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)

Claims (9)

  1. Echappement silencieux pour une installation de gaz d'échappement (1) d'un moteur à combustion interne, notamment dans un véhicule automobile,
    - comportant un logement (5), dans lequel au moins deux chambres de résonateur (6, 7, 8) sont séparées l'une de l'autre,
    - comportant un tuyau (4) guidant les gaz d'échappement, duquel bifurquent dans une portion de bifurcation (14) au moins deux tuyaux de bifurcation (11, 12, 13), qui débouchent dans des chambres de résonateur (6, 7, 8) différentes,
    - moyennant quoi la chambre de résonateur (6, 7, 8) respective forme avec le tuyau de bifurcation (11, 12, 13) afférent un résonateur de Helmholtz respectif (6-11, 7-12, 8-13),
    - moyennant quoi les au moins deux résonateurs de Helmholtz (6-11, 7-12, 8-13) présentent des fréquences de résonance différentes,
    caractérisé en ce que
    une chambre d'absorption (15) est disposée dans le logement (5), laquelle est reliée de manière communicante au tuyau (4) et est réalisée dans un manchon (16) enveloppant en parallélisme axial une porion longitudinale du tuyau (4).
  2. Echappement silencieux selon la revendication 1,
    caractérisé par au moins une des caractéristiques suivantes :
    - le tuyau (4) est guidé à travers le logement (5) ;
    - le tuyau (4) est guidé à travers au moins une chambre de résonateur (6, 7, 8) ou à travers toutes les chambres de résonateur (6, 7, 8).
  3. Echappement silencieux selon la revendication 1 ou 2,
    caractérisé par au moins une des caractéristiques suivantes :
    - au moins un des tuyaux de bifurcation (12, 13) est guidé à travers au moins une chambre de résonateur (6, 7) ;
    - au moins un des tuyaux de bifurcation (11, 12, 13) ou tous les tuyaux de bifurcation (11, 12, 13) sont disposés à l'intérieur du logement (5) ;
    - au moins un des tuyaux de bifurcation (11, 12, 13) ou tous les tuyaux de bifurcation (11, 12, 13) bifurquent radialement du tuyau (4) ;
    - au moins deux ou tous les tuyaux de bifurcation (11, 12, 13) diffèrent les uns des autres en ce qui concerne leur longueur et/ou leur section transversale ;
    - les tuyaux de bifurcation (11, 12, 13) bifurquent du tuyau (14) dans la portion de bifurcation (14) essentiellement en forme d'étoile ;
    - au moins un des tuyaux de bifurcation (12, 13) est guidé à travers au moins une paroi de séparation (9, 10) séparant l'une de l'autre deux chambres de résonateur (6, 7, 8) voisines ;
    - au moins un des tuyaux de bifurcation (12, 13) présente une portion s'étendant parallèlement au tuyau (4).
  4. Echappement silencieux selon une des revendications 1 à 3,
    caractérisé par au moins une des caractéristiques suivantes :
    - au moins deux ou toutes les chambres de résonateur (6, 7, 8) sont disposés l'une derrière l'autre axialement par rapport à une direction longitudinale du logement dans le logement (5) ;
    - au moins deux des chambres de résonateur (6, 7, 8) diffèrent l'une de l'autre en ce qui concerne leur volume ;
    - toutes les chambres de résonateur (6, 7, 8) présentent la même section transversale dans la direction longitudinale du logement ;
    - au moins deux chambres de résonateur (6, 7, 8) présentent des extensions axiales différentes par rapport à la direction longitudinale du logement.
  5. Echappement silencieux selon une des revendications 1 à 4,
    caractérisé par au moins une des caractéristiques suivantes :
    - la portion de bifurcation (14) est disposée à l'intérieur du logement (5) ;
    - la portion de bifurcation (14) est disposée à l'intérieur d'une des chambres de résonateur (6) ;
    - une extension longitudinale de la portion de bifurcation (14) dans la direction longitudinale du tuyau (4) correspond au diamètre d'un des tuyaux de bifurcation (11) mesuré dans la direction longitudinale du tuyau (4).
  6. Echappement silencieux selon une des revendications 1 à 5,
    caractérisé en ce que
    chaque résonateur de Helmholtz (6-11, 7-12, 8-13) présente seulement une chambre de résonateur unique (6, 7, 8) et seulement un tuyau de bifurcation unique (11, 12, 13).
  7. Echappement silencieux selon une des revendications 1 à 6,
    caractérisé en ce que
    pour chaque chambre de résonateur (6, 7, 8), exactement un tuyau de bifurcation (11, 12, 13) est prévu.
  8. Echappement silencieux selon une des revendications 1 à 7,
    caractérisé par au moins une des caractéristiques suivantes :
    - la chambre d'absorption (15) enveloppe complètement une portion longitudinale du tuyau (4) dans la direction circonférentielle ;
    - la chambre d'absorption (15) et/ou le manchon (16) s'étend dans au moins une chambre de résonateur (6, 7, 8) ou à travers au moins une chambre de résonateur (6, 7, 8) ;
    - la chambre d'absorption (15) et/ou le manchon (16) est isolé de manière étanche aux gaz par rapport aux chambres de résonateur (6, 7, 8) ;
    - la chambre d'absorption (15) et/ou le manchon (16) s'étend à travers au moins une paroi de séparation (9, 10) séparant l'une de l'autre deux chambres de résonateur (6, 7, 8) voisines ;
    - le tuyau (4) présente une perforation (17) dans une région communiquant avec la chambre d'absorption (15) ;
    - la chambre d'absorption (15) est remplie par un matériau d'absorption (19).
  9. Installation de gaz d'échappement pour un moteur à combustion interne, notamment dans un véhicule automobile,
    caractérisé par au moins un échappement silencieux (3) selon une des revendications 1 à 8.
EP06122631A 2005-11-10 2006-10-20 Silencieux Revoked EP1785602B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005054002.3A DE102005054002B4 (de) 2005-11-10 2005-11-10 Schalldämpfer

Publications (2)

Publication Number Publication Date
EP1785602A1 EP1785602A1 (fr) 2007-05-16
EP1785602B1 true EP1785602B1 (fr) 2008-10-08

Family

ID=37685186

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06122631A Revoked EP1785602B1 (fr) 2005-11-10 2006-10-20 Silencieux

Country Status (3)

Country Link
US (1) US20070102236A1 (fr)
EP (1) EP1785602B1 (fr)
DE (2) DE102005054002B4 (fr)

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CN105986853B (zh) 2015-02-05 2020-01-17 福特环球技术公司 ***
US11365658B2 (en) 2017-10-05 2022-06-21 Tenneco Automotive Operating Company Inc. Acoustically tuned muffler
DE102018124198A1 (de) 2017-10-05 2019-04-11 Tenneco Automotive Operating Company Inc. Akustisch abgestimmter Schalldämpfer
US11199116B2 (en) 2017-12-13 2021-12-14 Tenneco Automotive Operating Company Inc. Acoustically tuned muffler
US11268430B2 (en) 2019-01-17 2022-03-08 Tenneco Automotive Operating Company Inc. Diffusion surface alloyed metal exhaust component with welded edges
US11268429B2 (en) 2019-01-17 2022-03-08 Tenneco Automotive Operating Company Inc. Diffusion surface alloyed metal exhaust component with inwardly turned edges
DE102019111270A1 (de) * 2019-05-02 2020-11-05 Eberspächer Exhaust Technology GmbH & Co. KG Abgasschalldämpfer für eine Abgasanlage einer Brennkraftmaschine
US11421569B2 (en) 2019-10-18 2022-08-23 Tenneco Automotive Operating Company Inc. Muffler
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Also Published As

Publication number Publication date
DE502006001728D1 (de) 2008-11-20
DE102005054002A1 (de) 2007-05-16
US20070102236A1 (en) 2007-05-10
DE102005054002B4 (de) 2021-08-12
EP1785602A1 (fr) 2007-05-16

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