EP0077148A1 - Improved exhaust system for automotive vehicle or the like - Google Patents

Improved exhaust system for automotive vehicle or the like Download PDF

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Publication number
EP0077148A1
EP0077148A1 EP82305162A EP82305162A EP0077148A1 EP 0077148 A1 EP0077148 A1 EP 0077148A1 EP 82305162 A EP82305162 A EP 82305162A EP 82305162 A EP82305162 A EP 82305162A EP 0077148 A1 EP0077148 A1 EP 0077148A1
Authority
EP
European Patent Office
Prior art keywords
tail pipe
branch pipes
arrangement
branch
pipe
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Withdrawn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
EP82305162A
Other languages
German (de)
English (en)
French (fr)
Inventor
Motohiro Inaba
Hirofumi Takei
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.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor Co Ltd
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 Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Publication of EP0077148A1 publication Critical patent/EP0077148A1/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Withdrawn legal-status Critical Current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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/06—Tubes being formed by assembly of stamped or otherwise deformed sheet-metal
    • 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
    • F01N2490/14—Dead or resonance chambers connected to gas flow tube by relatively short side-tubes

Definitions

  • the present invention relates generally to an exhaust arrangement for an automotive vehicle or the like and more . specifically to an exhaust arrangement which reduces the resonance noise produced in the exhaust arrangement without increasing the flow resistance thereof.
  • an exhust system frequently includes an emission control device (e.g. catalytic converter) a diffuser, a silencer heat insulation, conduiting interconnection the various elements and brackets for suspending the conduiting, muffler, converter etc, beneath the vehicle.
  • an emission control device e.g. catalytic converter
  • a diffuser e.g. a diffuser
  • a silencer heat insulation e.g. conduiting interconnection the various elements and brackets for suspending the conduiting, muffler, converter etc, beneath the vehicle.
  • Fig. 1 of the drawings shows a previously proposed exhaust arrangement (publically disclosed in Nissan Periodical Bulletin No. 346 issued March 1981) wherein a center tube 1 leads from either the engine or a catalytic converter (or the like) to a main silencer 2. Leading from the silencer 2 is a tail pipe 3. In this arrangement the center tube 1 is curved so as to pass over the rear axle of the vehicle (not shown).
  • An object of the present invention is to provide an exhaust arrangement which can attenuate resonance noise without incurring any back pressure inducing flow restriction.
  • the present invention accordingly features an arrangement wherein the resonance energy normally produced within the tail pipe of an exhaust system is attenuated by providing auxiliary pipes which branch-off from the main tail pipe and which have lengths selected to produce resonances which offset and thus attenuate the noise producing resonances in the main pipe.
  • the present invention takes the form of an exhaust arrangement for an internal combustion engine comprising a tail pipe having an upstream end and a downstream end, a plurality of branch pipes each fluidly communicating with the tail pipe at a location intermediate of said upstream and downstream ends, and wherein the plurality of branch pipes each have a length half that of the preceding one.
  • a first embodiment of the present invention is shown in Figs. 2 to 5.
  • a tailpipe 10 leads from a silencer 12 to the ambient atmosphere.
  • a first branch pipe 14 having the same diameter as the tail pipe 10 leads from a point intermediate the two ends of the main tail pipe back toward the silencer 12. The length of this pipe is essentially half that of the main exhaust pipe (Viz., L/2).
  • a second branch pipe 16 also having the same diameter as the tail pipe, leads from a point intermediate the upstream end of the main tail pipe and the point at which the first branch pipe 16 communicates with same, back toward the silencer 12.
  • the length of this branch pipe is essentially 1/4 of the length (L) of the main tail pipe 10.
  • a bracket 18 for supporting the first branch pipe 14 is formed on the connector member 29 via which the second branch pipe 16 is connected to the main tail pipe 10 while a second bracket 22 for supporting the closed ends of the two branch pipes is provided immediately downstream of the silencer 12. It should be noted that the arrangement shown is preferred for reasons of compactness and that the branch pipes may be arranged differently if deemed advantageous.
  • Figs. 4 and 5 show in detail the manner in which the branch pipes connect with the main tail pipe.
  • the branch pipes interconnect at an angle for the purpose of eliminating whistling or reverberation noise which would be apt to be produced if the pipes intersected at right angles. This generating phenomenon may be further reduced by roughening the inner surfaces of the pipes adjacent the connector members.
  • both of the branch pipes are adapted to extend parallel with the main tail pipe and thus curve in a manner to pass over the rear axle of the vehicle (not shown).
  • the resonance which tends to produce peak b 4 and corresponding unillustrated peaks b 8 and b 12 may be attenuated by providing a branch tube having lengths L/16.
  • the actual length of the branch pipes in the first embodiment should in actual practice be slightly shorter than the theretical lengths L/2 and L/4, due to a slight tempreature differential which occurs between the gas in the main tail pipe and the branch pipes and according a slight acoustic velocity differential.
  • the branch pipes may be insulated, however this tends to add unnecessarily to the weight of the vehicle.
  • Figs. 7 to 12 show a second embodiment of the present invention.
  • This arrangement is similar to the first functionally, and differs only in that the branch pipes and the portion of the tail pipe to which they connect, are integrally formed by press-working. As shown, conduits 24 may be inserted into each end of the press formed member 26 so as to complete the arrangement. It will be noted that this arrangement tends to eliminate the previously mentioned temperature differential and thus permit the lenghts of the branch pipes to be formed at the theretical lengths of L.2 and L/4. Moreover, the curvature inherently produced during press working at the sites where the branch passages and the main tail pipe intesect function to reduce the previously mentioned whistling noise phenomenon. Again, roughening may be provided as required.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
EP82305162A 1981-09-29 1982-09-29 Improved exhaust system for automotive vehicle or the like Withdrawn EP0077148A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP15420081A JPS5857017A (ja) 1981-09-29 1981-09-29 自動車の排気装置
JP154200/81 1981-09-29

Publications (1)

Publication Number Publication Date
EP0077148A1 true EP0077148A1 (en) 1983-04-20

Family

ID=15579025

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82305162A Withdrawn EP0077148A1 (en) 1981-09-29 1982-09-29 Improved exhaust system for automotive vehicle or the like

Country Status (2)

Country Link
EP (1) EP0077148A1 (ja)
JP (1) JPS5857017A (ja)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1070903A1 (fr) * 1999-07-22 2001-01-24 Peugeot Citroen Automobiles SA Dispositif d'atténuation du bruit dans un tube destiné à transporter du gaz
US7240769B2 (en) * 1999-08-05 2007-07-10 Faurecia Systemes D'echappement Exhaust volume
EP1826369A3 (de) * 2006-02-23 2009-03-18 J. Eberspächer GmbH & Co. KG Schalldämpfer für eine Abgasanlage
US7861824B2 (en) * 2004-07-14 2011-01-04 J. Eberspacher Gmbh & Co. Kg Sound absorber for an exhaust system

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60120218U (ja) * 1984-01-23 1985-08-14 フタバ産業株式会社 サイドブランチ形消音器
JPS60127412U (ja) * 1984-02-06 1985-08-27 フタバ産業株式会社 サイドブランチ型消音器
JPS61138813U (ja) * 1985-02-20 1986-08-28
JP2528968Y2 (ja) * 1987-03-05 1997-03-12 日産ディーゼル工業株式会社 エンジンの吸気騒音低減装置
JP2010025020A (ja) * 2008-07-22 2010-02-04 Niigata Power Systems Co Ltd 消音装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2297046A (en) * 1939-08-25 1942-09-29 Maxim Silencer Co Means for preventing shock excitation of acoustic conduits or chambers
US3289786A (en) * 1965-05-17 1966-12-06 Walker Mfg Co Muffler with return bend tuning passage
US3402785A (en) * 1965-10-23 1968-09-24 Walker Mfg Co Muffler with resonance chambers for high and low frequencies
US3429397A (en) * 1967-09-26 1969-02-25 Walker Mfg Co Laminated conduit and acoustic silencer
US3739874A (en) * 1971-10-12 1973-06-19 Tenneco Inc Muffler with tuning tube

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2297046A (en) * 1939-08-25 1942-09-29 Maxim Silencer Co Means for preventing shock excitation of acoustic conduits or chambers
US3289786A (en) * 1965-05-17 1966-12-06 Walker Mfg Co Muffler with return bend tuning passage
US3402785A (en) * 1965-10-23 1968-09-24 Walker Mfg Co Muffler with resonance chambers for high and low frequencies
US3429397A (en) * 1967-09-26 1969-02-25 Walker Mfg Co Laminated conduit and acoustic silencer
US3739874A (en) * 1971-10-12 1973-06-19 Tenneco Inc Muffler with tuning tube

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1070903A1 (fr) * 1999-07-22 2001-01-24 Peugeot Citroen Automobiles SA Dispositif d'atténuation du bruit dans un tube destiné à transporter du gaz
FR2796748A1 (fr) * 1999-07-22 2001-01-26 Peugeot Citroen Automobiles Sa Dispositif d'attenuation du bruit dans un tube destine a transporter un gaz
US7240769B2 (en) * 1999-08-05 2007-07-10 Faurecia Systemes D'echappement Exhaust volume
US7861824B2 (en) * 2004-07-14 2011-01-04 J. Eberspacher Gmbh & Co. Kg Sound absorber for an exhaust system
EP1826369A3 (de) * 2006-02-23 2009-03-18 J. Eberspächer GmbH & Co. KG Schalldämpfer für eine Abgasanlage

Also Published As

Publication number Publication date
JPS5857017A (ja) 1983-04-05

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

17P Request for examination filed

Effective date: 19821011

AK Designated contracting states

Designated state(s): DE FR GB

18W Application withdrawn

Withdrawal date: 19830328

RIN1 Information on inventor provided before grant (corrected)

Inventor name: INABA, MOTOHIRO

Inventor name: TAKEI, HIROFUMI