EP1607594A1 - Silencieux d'échappement pour moteur à combustion interne - Google Patents

Silencieux d'échappement pour moteur à combustion interne Download PDF

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Publication number
EP1607594A1
EP1607594A1 EP05105236A EP05105236A EP1607594A1 EP 1607594 A1 EP1607594 A1 EP 1607594A1 EP 05105236 A EP05105236 A EP 05105236A EP 05105236 A EP05105236 A EP 05105236A EP 1607594 A1 EP1607594 A1 EP 1607594A1
Authority
EP
European Patent Office
Prior art keywords
receptacle
discharge pipe
sound
exhaust system
seal
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Withdrawn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
EP05105236A
Other languages
German (de)
English (en)
Inventor
Lars Birgersson
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.)
GGP Sweden AB
Original Assignee
GGP Sweden AB
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 GGP Sweden AB filed Critical GGP Sweden AB
Publication of EP1607594A1 publication Critical patent/EP1607594A1/fr
Withdrawn legal-status Critical Current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
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F01N1/086—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling having means to impart a whirling motion to the exhaust gases
    • F01N1/087—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling having means to impart a whirling motion to the exhaust gases using tangential inlets into a circular chamber
    • 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
    • F01N1/083—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using transversal baffles defining a tortuous path for the exhaust gases or successively throttling exhaust gas flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F01N1/084—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling the exhaust gases flowing through the silencer two or more times longitudinally in opposite directions, e.g. using parallel or concentric tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F01N1/085—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling throttling exhaust gas flow using a central core in a flow passage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F01N1/089—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using two or more expansion chambers in series

Definitions

  • the present invention relates to a sound-absorbing exhaust system for an internal combustion engine, said exhaust system comprising a receptacle, an inlet which is arranged in the receptacle and through which exhaust gases can be directed into the receptacle, and a discharge pipe, which connects the interior of the receptacle to the ambient air and through which exhaust gases can be discharged from the receptacle.
  • Such sound-absorbing exhaust systems are used for internal combustion engines of various types, preferably small ones, which are used, for instance, in mopeds, lawnmowers and the like.
  • the sound-absorbing exhaust system serves to reduce the noise arising as exhaust gases leave the internal combustion engine, for the purpose of reducing acoustic nuisances.
  • the invention relates to a sound-absorbing exhaust system of the above type where the discharge pipe at its end positioned outside the receptacle has a seal, which substantially seals the discharge pipe at this end, where the discharge pipe has at least one radial hole, which is positioned outside the receptacle, and where a sleeve wholly or partially surrounds the discharge pipe outside the receptacle.
  • the discharge pipe preferably has a plurality of radial holes, which are positioned outside the receptacle. This means that the exhaust gases are spread in the space between the discharge pipe and the sleeve in a suitable manner.
  • the seal comprises a star crimp. This can be easily provided and requires no further components.
  • the sleeve which preferably is attached to the receptacle, suitably projects from the receptacle to the same extent as does the discharge pipe, which results in improved absorption.
  • the receptacle is elongate in the longitudinal direction of the discharge pipe, and the discharge pipe extends into the receptacle, at least along half the length of the receptacle.
  • the receptacle is, in the longitudinal direction, suitably divided into a plurality of chambers by means of one or more gas-permeable partitions. This results in improved sound-absorption.
  • the discharge pipe has at its end positioned in the receptacle a seal and a plurality of radial holes.
  • the discharge pipe can have the same design in both ends, which is advantageous in terms of manufacture.
  • Fig. 1 is a perspective view of a sound-absorbing exhaust system 1 according to an embodiment of the invention.
  • the exhaust system 1 is adapted to be connected to an internal combustion engine and comprises a receptacle 2 of welded sheet metal.
  • the receptacle defines an inner space of a certain volume.
  • An inlet 3 is arranged in the receptacle 2, as shown with a connecting pipe. Exhaust gases from the internal combustion engine can be directed through the inlet 3 into the receptacle 2.
  • the exhaust system 1 further has a discharge pipe, which connects the interior of the receptacle 2 to the ambient air and through which exhaust gases can be discharged from the receptacle 2. Of the discharge pipe, Fig. 1 shows only an end, which is provided with a seal 5.
  • That part of the discharge pipe which projects out of the receptacle is radially surrounded by an outer sleeve 7, which preferably is concentric with the discharge pipe.
  • the sleeve 7 is arranged so that a space is formed between the sleeve 7 and the discharge pipe, through which space exhaust gases can flow.
  • Fig. 2 is a schematic longitudinal section through the exhaust system in Fig. 1.
  • Fig. 2 shows that the discharge pipe 4 extends into the receptacle 2.
  • the discharge pipe can be about 40 cm long, have an outer diameter of 32 mm and a material thickness of 1.5 mm.
  • the discharge pipe 4 has, as mentioned above, a seal 5, which substantially seals the discharge pipe 4 at this end.
  • substantially seals is meant that the seal 5 largely seals the discharge pipe 4, but that a certain degree of leakage through the seal 5 can still be allowed.
  • the seal 5 is provided by what is referred to as a star crimp, i.e.
  • the outer end of the discharge pipe 4 is folded so that a seal is provided.
  • the star crimp is easy to provide and can be made in one operation.
  • other ways of arranging the seal of the pipe are conceivable; for instance a sealing plate can be welded to the end of the pipe, or the end of the pipe can be threaded and sealed by a screw cap.
  • the discharge pipe 4 has at least one, but preferably a plurality of, for instance about 50, radial holes 6, distributed in three rows for instance, which holes are positioned outside the receptacle 2.
  • the holes are radial with regard to the longitudinal (axial) direction of the discharge pipe and can, for instance, have a diameter of 3.5 mm.
  • the discharge pipe 4 has also at the end positioned in the receptacle 2 a seal 15 and a plurality of radial holes 16.
  • both ends of the discharge pipe can have the same appearance.
  • the inner part of a discharge pipe 20 can be configured in the same way.
  • the outer sleeve 7 wholly or partially surrounds the discharge pipe 4 in the radial direction.
  • the sleeve is 5 cm long and has an outer diameter of 5 cm.
  • the sleeve 7 is preferably attached to the receptacle 2, for instance welded to the same.
  • the sleeve 7 projects preferably to about the same extent from the receptacle 2 as does the discharge pipe 4, but can also be longer or shorter than that.
  • the sleeve 7 gives, together with the seal 5 and the radial holes 6, a pressure, pulse and flow equalising effect, which reduces the noise level of the system.
  • the receptacle 2 is elongate in the longitudinal direction of the discharge pipe 4.
  • the discharge pipe 4 extends into the receptacle 2, at least along half the length of the receptacle 2.
  • the receptacle can be divided in the longitudinal direction into a plurality of (for instance, as shown, two) chambers 10, 11 by partitions 13 which are gas permeable in various ways.
  • the receptacle 2 can have three chambers.
  • Fig. 2 also illustrates an exhaust gas flow 19 through the exhaust system 1.
  • the exhaust gases enter the system through an inlet pipe 20, which is inserted into the opening 3 of the receptacle 2.
  • the exhaust gases then reach, through a radial hole in the inlet pipe 20, a first chamber 10. Subsequently the exhaust gases pass on to a second chamber 11 through a partition 13, which is perforated. After that the exhaust gases pass into the discharge pipe 4 through radial holes 16 at the inner end thereof.
  • the exhaust gas flow 19 then follows the discharge pipe 4 and passes out of the same through the radial holes 6 at the outer end, to the space between the discharge pipe 4 and the surrounding sleeve 7. From this space the exhaust gas flow 19 finally reaches the ambient air.
  • Fig. 3 shows the result of a comparison between a conventional exhaust system and an exhaust system modified according to the invention.
  • the conventional system does not have the sleeve 7 in Figs 1-2, the discharge pipe does not have the seal 5 at the outer end and the radial holes 6 outside the receptacle. Otherwise the systems are identical.
  • the graph in Fig. 3 shows the noise level at different frequency bands for the conventional system (dotted line) and for the system according to an embodiment of the invention (solid line).
  • the measurement at the distance 4 m relates to the exhaust gas noise only, since the actual engine (one-cylinder engine) has been made sound-insulated on the occasion of measurement.
  • the noise level is typically about 3 dB lower for the system according to the invention.
  • the reduction is achieved substantially in the range of 400 Hz - 5 kHz, which gives a significantly less sharp and disturbing sound.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
EP05105236A 2004-06-17 2005-06-15 Silencieux d'échappement pour moteur à combustion interne Withdrawn EP1607594A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE4015541 2004-06-17
SE0401554A SE528092C2 (sv) 2004-06-17 2004-06-17 Anordning vid förbränningsmotor

Publications (1)

Publication Number Publication Date
EP1607594A1 true EP1607594A1 (fr) 2005-12-21

Family

ID=32710073

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05105236A Withdrawn EP1607594A1 (fr) 2004-06-17 2005-06-15 Silencieux d'échappement pour moteur à combustion interne

Country Status (3)

Country Link
US (1) US20050279572A1 (fr)
EP (1) EP1607594A1 (fr)
SE (1) SE528092C2 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1830044A1 (fr) * 2006-03-01 2007-09-05 Dr.Ing. h.c.F. Porsche Aktiengesellschaft Système d'échappement
EP1908930A3 (fr) * 2006-10-03 2009-09-02 Seat, S.A. Silencieux d'échappement pour véhicule automobile
WO2011061213A1 (fr) * 2009-11-17 2011-05-26 Heinrich Gillet Gmbh Silencieux
EP2354483A3 (fr) * 2010-02-05 2012-05-30 J. Eberspächer GmbH & Co. KG Silencieux
CN103573365A (zh) * 2012-07-24 2014-02-12 佛吉亚排放控制技术德国有限公司 排气系统的排气承载部件
EP3489492A1 (fr) 2017-11-22 2019-05-29 Wise Motor Works, Ltd. Moteur à combustion interne, procédé de modification d'un moteur et procédé d'exploitation d'un moteur
US10344670B2 (en) 2013-06-05 2019-07-09 Wise Motor Works, Ltd. Internal combustion engine with paired, parallel, offset pistons

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4688836B2 (ja) * 2007-03-28 2011-05-25 本田技研工業株式会社 小型艇の排気装置
DE102015103303B3 (de) * 2015-03-06 2016-09-01 Tenneco Gmbh Mix Box
USD871289S1 (en) * 2018-06-26 2019-12-31 Stephen A. Kana Exhaust muffler for automobile

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1206105A (en) * 1966-08-31 1970-09-23 Hendry Brothers London Ltd Improvements in and relating to exhaust silencers
JPS56138412A (en) * 1980-03-31 1981-10-29 Nippon Radiator Co Ltd Dual muffler
US4627515A (en) * 1984-10-01 1986-12-09 Alessandro Luigi D Exhaust device
US6241044B1 (en) * 1999-02-05 2001-06-05 Komatsu Ltd. Exhaust silencer and communicating pipe thereof
US6540046B1 (en) * 2001-08-06 2003-04-01 Nelson Industries, Inc. Compact economical spark arrestor and muffler

Family Cites Families (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US787860A (en) * 1904-07-02 1905-04-18 Nathan William Horatio Sharpe Exhaust-muffler.
US879583A (en) * 1906-05-16 1908-02-18 Arthur Pratt Exhaust-muffler.
US1700993A (en) * 1927-05-09 1929-02-05 Bernet Franz Xavier Silencer for internal-combustion engines
US1909394A (en) * 1930-05-31 1933-05-16 Bendix Aviat Corp Muffler
US2115128A (en) * 1936-12-14 1938-04-26 Buffalo Pressed Steel Company Muffler
US2241010A (en) * 1938-12-30 1941-05-06 Burgess Battery Co Apparatus for silencing pulsating gases
US2520756A (en) * 1945-12-03 1950-08-29 Nelson Muffler Corp Exhaust silencer for internalcombustion engines
US2570728A (en) * 1948-11-29 1951-10-09 William D Storey Muffler with frusto-conical baffle and removably disposed perforated extension tube
US3752260A (en) * 1971-07-15 1973-08-14 Tenneco Inc Air rush silencer
US4305477A (en) * 1979-12-20 1981-12-15 Deere & Company Exhaust tuning means for internal combustion engines
US4341284A (en) * 1979-12-20 1982-07-27 Deere & Company Silencer means for internal combustion engines
US4388804A (en) * 1981-08-17 1983-06-21 J. I. Case Company Exhaust assembly for tractors
GB8307371D0 (en) * 1983-03-17 1983-04-27 Chillcotts Ltd Exhaust silencer
US4705138A (en) * 1985-12-24 1987-11-10 The Dow Chemical Company Steam trap muffler
US4792014A (en) * 1987-12-24 1988-12-20 Shin Seng Lin Tail pipe for drafting engine exhaust gas
US4909347A (en) * 1989-07-28 1990-03-20 Chan-Yan Wang Exhaust tube
US5214254A (en) * 1992-03-20 1993-05-25 Sheehan Russell T Triple cone exhaust wave tuner
US5321215A (en) * 1993-05-11 1994-06-14 Nelson Industries, Inc. Vertical exhaust system incorporating a water trap
CA2218711C (fr) * 1995-08-17 2001-08-14 Arvin Industries, Inc. Silencieux pourvu d'un syntoniseur a conduit
JP3753800B2 (ja) * 1996-07-25 2006-03-08 本田技研工業株式会社 自動二輪車用マフラー
US6220387B1 (en) * 1999-10-21 2001-04-24 Mathew S. Hoppes Exhaust muffler
JP2003314240A (ja) * 2002-02-20 2003-11-06 Sango Co Ltd 内燃機関の消音器
US6880670B2 (en) * 2002-10-29 2005-04-19 Beda Charles Dondi Muffler for suction system exhaust air used with an automatic cutting machine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1206105A (en) * 1966-08-31 1970-09-23 Hendry Brothers London Ltd Improvements in and relating to exhaust silencers
JPS56138412A (en) * 1980-03-31 1981-10-29 Nippon Radiator Co Ltd Dual muffler
US4627515A (en) * 1984-10-01 1986-12-09 Alessandro Luigi D Exhaust device
US6241044B1 (en) * 1999-02-05 2001-06-05 Komatsu Ltd. Exhaust silencer and communicating pipe thereof
US6540046B1 (en) * 2001-08-06 2003-04-01 Nelson Industries, Inc. Compact economical spark arrestor and muffler

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1830044A1 (fr) * 2006-03-01 2007-09-05 Dr.Ing. h.c.F. Porsche Aktiengesellschaft Système d'échappement
EP1908930A3 (fr) * 2006-10-03 2009-09-02 Seat, S.A. Silencieux d'échappement pour véhicule automobile
WO2011061213A1 (fr) * 2009-11-17 2011-05-26 Heinrich Gillet Gmbh Silencieux
EP2354483A3 (fr) * 2010-02-05 2012-05-30 J. Eberspächer GmbH & Co. KG Silencieux
CN103573365A (zh) * 2012-07-24 2014-02-12 佛吉亚排放控制技术德国有限公司 排气系统的排气承载部件
US10344670B2 (en) 2013-06-05 2019-07-09 Wise Motor Works, Ltd. Internal combustion engine with paired, parallel, offset pistons
US10690050B2 (en) 2013-06-05 2020-06-23 Wise Motor Works, Ltd. Internal combustion engine with paired, parallel, offset pistons
EP3489492A1 (fr) 2017-11-22 2019-05-29 Wise Motor Works, Ltd. Moteur à combustion interne, procédé de modification d'un moteur et procédé d'exploitation d'un moteur

Also Published As

Publication number Publication date
SE0401554D0 (sv) 2004-06-17
SE528092C2 (sv) 2006-09-05
US20050279572A1 (en) 2005-12-22
SE0401554L (sv) 2005-12-18

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