EP1826369A2 - Silencieux pour un système d'échappement - Google Patents

Silencieux pour un système d'échappement Download PDF

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Publication number
EP1826369A2
EP1826369A2 EP20070102348 EP07102348A EP1826369A2 EP 1826369 A2 EP1826369 A2 EP 1826369A2 EP 20070102348 EP20070102348 EP 20070102348 EP 07102348 A EP07102348 A EP 07102348A EP 1826369 A2 EP1826369 A2 EP 1826369A2
Authority
EP
European Patent Office
Prior art keywords
tube
housing
passage
blind
absorption 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.)
Granted
Application number
EP20070102348
Other languages
German (de)
English (en)
Other versions
EP1826369B1 (fr
EP1826369A3 (fr
Inventor
Sascha Leng
Marco Jess
Sebastian Hutschenreuther
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eberspaecher Exhaust Technology GmbH and Co KG
Original Assignee
J Eberspaecher GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by J Eberspaecher GmbH and Co KG filed Critical J Eberspaecher GmbH and Co KG
Publication of EP1826369A2 publication Critical patent/EP1826369A2/fr
Publication of EP1826369A3 publication Critical patent/EP1826369A3/fr
Application granted granted Critical
Publication of EP1826369B1 publication Critical patent/EP1826369B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/02—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
    • 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
    • F01N2470/02—Tubes being perforated

Definitions

  • the present invention relates to a silencer for an exhaust system of an internal combustion engine, in particular in a motor vehicle.
  • a rear silencer is located near a tailpipe, from which the exhaust gases are emitted into the environment.
  • a rear silencer comprises a housing in which an absorption chamber filled with an absorption material is contained.
  • An exhaust-carrying pipe of the muffler which is connected to the exhaust system or forms part of an exhaust system of the exhaust system, is passed through the housing and the absorption chamber.
  • a wall of this passage tube is perforated, whereby in the exhaust gas flow entrained airborne sound can enter into the absorption chamber and is absorbed in the absorption material.
  • a certain damping characteristic is achieved.
  • Medium and higher frequencies are relatively strongly attenuated in this construction, while lower frequencies are attenuated only comparatively low. This circumstance can be exploited for a targeted sound design.
  • the present invention is concerned with the problem of providing a muffler of the type mentioned an improved embodiment, which is characterized by a relatively high level reduction of the lower and higher frequencies and by a relatively low attenuation of the average frequencies.
  • the invention is based on the general idea of branching off from the through tube passed through the housing a dummy tube which has a wall permeable to airborne sound within the absorption chamber.
  • the displacement of the airborne sound transmissive area in the blind tube leads to a weakening of the damping effect middle frequencies, while the damping effect for higher frequencies is substantially unchanged high.
  • this construction results in that the through-tube better transmits the middle frequencies, which means a gain for the middle frequencies compared to a conventional construction, while the through-tube for the lower frequencies quasi a greater length, which for the lower frequencies a greater level reduction Episode has.
  • the construction according to the invention with branched from the passage tube, radially sound-transmitting blind tube has an attenuation characteristic at lower frequencies a greater level reduction, at medium frequencies a weaker attenuation or a (minor) gain and at higher frequencies about constant damping causes.
  • the silencer according to the invention has a structurally simple design, which makes it particularly suitable for mass production.
  • the passage tube in the interior of the housing or in the interior of the absorption chamber, apart from a connection point, via which the blind tube is connected to the passage tube have a wall which is impermeable to airborne sound.
  • FIG. 1 shows a highly simplified, schematic longitudinal section through a muffler.
  • a silencer 1 comprises a housing 2 and a passage pipe 3 guided through the housing 2.
  • the silencer 1 is used for installation in an exhaust system 4 of an internal combustion engine which is only partially shown and which is arranged in particular in a motor vehicle.
  • the passage pipe 3 can be connected to an exhaust line 5 of the exhaust system 4.
  • the passage pipe 3 is used for exhaust gas routing during operation of the exhaust system 4 or during operation of the internal combustion engine equipped therewith.
  • the flow direction of the exhaust gases in the passage tube 3 is preferably as indicated in Fig. 1 by arrows 6.
  • the muffler 1 is preferably designed as a rear muffler, in which case the through-tube 3 is connected on the outlet side to an end tube 7 of the exhaust system 4 or already itself forms the tailpipe 7 of the exhaust system 4 or of the exhaust-gas line 5.
  • At least one absorption chamber 8 is formed in the housing 2, at least one absorption chamber 8 is formed. In the example shown, substantially the entire interior of the housing 2 is formed by the absorption chamber 8. The absorption chamber 8 is filled with an absorbent material 9, which absorbs airborne sound.
  • At least one blind tube 10 is connected to the passage tube 3 in the interior of the housing 2.
  • said dummy tube 10 is connected at one end laterally to the passage tube 3, while it is closed at 12 the other end.
  • the blind tube 10 has a wall 13 which is permeable to airborne sound in an unspecified area which extends within the absorption chamber 8.
  • the wall 13 of the blind tube 10 is at least partially provided with a perforation 14.
  • the through-tube 3 is passed through the housing 2 without interruptions.
  • the through-tube 3 may preferably be designed such that it has, apart from the side opening 15, an air-impermeable wall 16.
  • the wall 16 of the passage tube 3 is not perforated. In certain cases it can too be necessary to provide the passage tube 3 with a permeable wall for airborne sound (eg for damping flow noise). Since, in the present case, the absorption chamber 8 completely fills the interior of the housing 2, the passage tube 3 is also forced through the absorption chamber 8.
  • the passage tube 3 has in this case a rectilinear input portion 17 which leads into the housing 2, a rectilinear output portion 18, which leads out of the housing 2, and a curved curved portion 19 which connects the two rectilinear portions 17, 18 with each other.
  • the passage tube 3 thus has in the housing 2 a kink, which is formed by the curved portion 19.
  • the blind tube 10 is now connected in the region of the curve portion 19 to the passage tube 3, in particular with respect to the radius of curvature radially outward.
  • the side opening 15 is located on the curve outside of the curve section 19.
  • the passage tube 3 preferably has in the straight sections 17, 18 in each case a constant inner cross section, which may in particular be the same size.
  • the blind tube 10 has a curved connection section 20 and a rectilinear end section 21.
  • the end section 21 is closed at the end, ie at 12, and connected to the passage tube 3 via the curved connection section 20.
  • the for airborne sound permeable wall 13 provided only in the rectilinear end portion 21.
  • the blind tube 10 can have a constant inner cross section at least in the end section 21.
  • the closed end 12 of the blind tube 10 may be provided with a conical end piece 22, for example.
  • the preferred embodiment shown here is characterized in that the output portion 18 of the passage tube 3 and the end portion 21 of the dummy tube 10 extend substantially parallel to each other. This allows a particularly compact design for the muffler 1 can be achieved.
  • the position of the tubes 3, 10 to each other, however, may differ from the parallel pipe guide due to other designs.
  • the housing 2 may be equipped with at least one intermediate bottom 23, which extends, for example, substantially parallel to two end faces 24 of the housing 2.
  • the intermediate bottom 23 divides the absorption chamber 8 into two sub-chambers 8 I and 8 II .
  • the intermediate bottom 23 is permeable to airborne sound, to which it is preferably provided with a perforation 25.
  • the passage tube 3 is passed through the intermediate bottom 23 and supported on this laterally or radially.
  • the blind tube 10 is passed through the intermediate bottom 23 and supported laterally thereon.
  • the respective tube 3, 10 can be at the intermediate bottom Be attached 23 or stored on a sliding seat.
  • the perforation 14 of the wall 13 is interrupted in the region of the support of the dummy tube 10 at the intermediate bottom 23 in order to increase the strength of the blind tube 10 there.
  • the housing 2 contains only a single absorption chamber 8.
  • a single passage tube 3 is expediently provided.
  • only a single blind tube 10 is provided here.
  • two or more dummy tubes 10 can branch off from the passage tube 3.
  • the dummy tube 10 can optionally also be designed as a ⁇ / 4 tube, which can improve the targeted damping of certain frequencies.
  • the noise spectrum of an internal combustion engine designed as a piston engine is determined by the number of ignition processes per crankshaft revolution and by the rotational speed of the internal combustion engine or the rotational speed of the crankshaft.
  • the lowest characteristic frequency of a reciprocating engine results from the number of ignitions per second.
  • the main frequency of the noise generated thereby is of the second order, which is also referred to as the main order. This main order makes the low frequencies of engine noise.
  • Medium frequencies then have a higher engine order, such as the fourth, sixth, and eighth engine orders.
  • the muffler 1 according to the invention can be specifically designed such that the main engine order (for example the second order) is lowered comparatively strongly, while the next higher engine orders, preferably the fourth, sixth and eighth engine orders, leave the muffler 1 comparatively undamped.
  • the main engine order for example the second order
  • the next higher engine orders preferably the fourth, sixth and eighth engine orders
  • the muffler 1 comparatively undamped Even higher orders are already among the high frequencies that are preferably absorbed in the absorbent material 9.
  • an internal combustion engine having a different number of cylinders and / or another combustion process e.g., two-stroke system

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
EP07102348.5A 2006-02-23 2007-02-14 Silencieux pour un système d'échappement Active EP1826369B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006008941A DE102006008941A1 (de) 2006-02-23 2006-02-23 Schalldämpfer für eine Abgasanlage

Publications (3)

Publication Number Publication Date
EP1826369A2 true EP1826369A2 (fr) 2007-08-29
EP1826369A3 EP1826369A3 (fr) 2009-03-18
EP1826369B1 EP1826369B1 (fr) 2016-05-18

Family

ID=38008180

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07102348.5A Active EP1826369B1 (fr) 2006-02-23 2007-02-14 Silencieux pour un système d'échappement

Country Status (5)

Country Link
US (1) US7527125B2 (fr)
EP (1) EP1826369B1 (fr)
JP (1) JP5221883B2 (fr)
CN (1) CN101025103B (fr)
DE (1) DE102006008941A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL2855108T3 (pl) * 2012-06-01 2020-09-21 Sunds Fibertech Ab Linia rozdmuchowa ze zgięciem i instalacja do przetwarzania włókien z linią rozdmuchową
KR20140080644A (ko) * 2012-12-12 2014-07-01 기아자동차주식회사 듀얼 머플러
DE102018112963A1 (de) * 2018-05-30 2019-12-05 Faurecia Emissions Control Technologies, Germany Gmbh Schalldämpfer für eine Abgasanlage einer Brennkraftmaschine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4501341A (en) 1981-03-12 1985-02-26 Jones Adrian D Low frequency muffler
DE3836589A1 (de) 1988-10-27 1990-05-03 Eberspaecher J Kompaktschalldaempfer fuer nutzfahrzeuge

Family Cites Families (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB403651A (en) * 1931-06-20 1933-12-20 Burgess Lab Inc C F Silencer for gaseous currents
US1954516A (en) * 1931-10-19 1934-04-10 Maxim Silencer Co Sound attenuating device
DE626889C (de) * 1932-12-18 1937-12-27 Ulrich Schmidt Dr Ing Schalldaempfer fuer den Auspuff von Brennkraftmaschinen
US2103810A (en) * 1935-04-16 1937-12-28 Caspar Eduard Silencer for the exhaust gases of internal combustion engines
US2297046A (en) * 1939-08-25 1942-09-29 Maxim Silencer Co Means for preventing shock excitation of acoustic conduits or chambers
US3402785A (en) * 1965-10-23 1968-09-24 Walker Mfg Co Muffler with resonance chambers for high and low frequencies
US3396812A (en) * 1967-07-05 1968-08-13 Arvin Ind Inc Acoustic quarter wave tube
US3434565A (en) * 1967-12-21 1969-03-25 Walker Mfg Co Silencer with angled tuning tube leading to helmholtz resonator
US3776364A (en) * 1972-04-28 1973-12-04 Donaldson Co Inc Noise reduction apparatus and method
JPS5713373Y2 (fr) * 1977-05-26 1982-03-17
JPS5857017A (ja) * 1981-09-29 1983-04-05 Nissan Motor Co Ltd 自動車の排気装置
JPS59514A (ja) * 1982-06-23 1984-01-05 Sango:Kk 内燃機関における排気系のマフラ
JPS5941618A (ja) * 1982-08-31 1984-03-07 Nissan Motor Co Ltd 自動車用エンジンの排気騒音低減装置
JPS63285213A (ja) * 1987-05-18 1988-11-22 Nissan Motor Co Ltd 消音装置
US4841728A (en) * 1987-07-10 1989-06-27 Jyh-Jian Jean Straight through type muffler for generating the exhaust flow from an internal combustion engine
JPH07101002B2 (ja) * 1987-12-22 1995-11-01 日産自動車株式会社 共鳴型消音器
US4821840A (en) * 1988-01-20 1989-04-18 Ap Parts Manufacturing Company Stamp formed exhaust muffler with conformal outer shell
DE3807948A1 (de) * 1988-03-10 1989-09-28 Eberspaecher J Schalldaempfer fuer fahrzeugmotore
JP2559477B2 (ja) * 1988-10-05 1996-12-04 日産自動車株式会社 排気消音装置
JPH078516U (ja) * 1993-06-25 1995-02-07 三恵工業株式会社 共鳴型サブマフラ
DE50110583D1 (de) * 2000-04-14 2006-09-14 Eberspaecher J Gmbh & Co Abgas-Schalldämpfer in Mehrkammerbauweise
DE20011756U1 (de) * 2000-07-06 2000-10-12 Boysen Friedrich Gmbh Co Kg Schalldämpfer
DE10300773A1 (de) * 2003-01-11 2004-07-22 Daimlerchrysler Ag Abgasanlage für eine mehrzylindrige Brennkraftmaschine
US20060283660A1 (en) * 2005-06-15 2006-12-21 Siemens Westinghouse Power Corporation Acoustic termination for a pressure monitoring system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4501341A (en) 1981-03-12 1985-02-26 Jones Adrian D Low frequency muffler
DE3836589A1 (de) 1988-10-27 1990-05-03 Eberspaecher J Kompaktschalldaempfer fuer nutzfahrzeuge

Also Published As

Publication number Publication date
US20070205045A1 (en) 2007-09-06
CN101025103A (zh) 2007-08-29
CN101025103B (zh) 2012-02-01
EP1826369B1 (fr) 2016-05-18
US7527125B2 (en) 2009-05-05
JP2007224913A (ja) 2007-09-06
EP1826369A3 (fr) 2009-03-18
DE102006008941A1 (de) 2007-08-30
JP5221883B2 (ja) 2013-06-26

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