EP1789660B1 - An improved exhaust system of a single cylinder four stroke spark ignition engine - Google Patents

An improved exhaust system of a single cylinder four stroke spark ignition engine Download PDF

Info

Publication number
EP1789660B1
EP1789660B1 EP05815839A EP05815839A EP1789660B1 EP 1789660 B1 EP1789660 B1 EP 1789660B1 EP 05815839 A EP05815839 A EP 05815839A EP 05815839 A EP05815839 A EP 05815839A EP 1789660 B1 EP1789660 B1 EP 1789660B1
Authority
EP
European Patent Office
Prior art keywords
vehicle
chamber
header pipe
engine
torque
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.)
Not-in-force
Application number
EP05815839A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1789660A1 (en
Inventor
Joseph Abraham
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.)
Bajaj Auto Ltd
Original Assignee
Bajaj Auto 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=35645689&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1789660(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Bajaj Auto Ltd filed Critical Bajaj Auto Ltd
Publication of EP1789660A1 publication Critical patent/EP1789660A1/en
Application granted granted Critical
Publication of EP1789660B1 publication Critical patent/EP1789660B1/en
Not-in-force 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/02—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate silencers in series
    • 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
    • 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
    • F01N2490/14—Dead or resonance chambers connected to gas flow tube by relatively short side-tubes

Definitions

  • the present invention relates to a vehicle comprising an exhaust system for improving the torque characteristics of an engine, in particular of a single cylinder four stroke spark ignition engine.
  • the invention further relates to improvement in an exhaust system of a vehicle, in particular in vehicles using a single cylinder four stroke spark ignition engine, which results in enhanced performance.
  • the invention enables an improvement in the torque production of the engine at lower engine speeds.
  • the applicant has designed engines utilizing the invention in which torque improvements have been made at engine speeds ranging from 3000 to 5000 RPM, which is typically a normal vehicle driving zone, while still achieving high power outputs at higher engine speeds.
  • This invention is especially useful to engines used as prime movers for two and three wheeled vehicles.
  • a reference to "vehicles" in this specification should be taken to be a reference to vehicles using single cylinder, four stroke, 'spark ignition engines and a reference to 'engines' in this specification is meant for single cylinder, four stroke, spark ignition engines.
  • Vehicles are generally equipped with an exhaust system in order to achieve desired performance characteristics of the engine, reduce noise of combustion from of the engine and to allow products of combustion of air-fuel mixture to escape to the atmosphere in a defined direction.
  • a simple motorcycle exhaust system consists of header pipe, a muffler and if necessary, a guard or heat shield.
  • the header pipe may be of single diameter or with one or more steps of different diameters.
  • One end of the exhaust system is attached to the exhaust port of the engine and other end is at the rear of vehicle.
  • the exhaust system is neatly packaged within the space available in the motorcycle.
  • an exhaust system wherein higher torque is produced at lower engine speeds whilst still retaining the desired engine performance and torque at higher engine speeds and also maintaining desirable noise levels.
  • This is achieved by connecting a chamber of predetermined volume, externally to the header pipe (stepped or otherwise) of the exhaust system at a point preferably between 40% to 60% of developed length of the header pipe from the face of exhaust flange along the length of said header pipe either directly or through a connecting tube.
  • the location of the chamber is selected to accommodate it within available space in motorcycle and without sacrificing the ground clearance.
  • the applicants' improved exhaust system according to this invention enables at least two torque peaks to be produced in the torque vs. engine speed relationship.
  • one of the torque peaks occurs at approximately 4500 engine RPM and second at approximately 6000 engine RPM.
  • the exhaust system enables availability of torque at 3500 RPM to be within 5% of the peak torque at 6000 RPM.
  • the improved exhaust system according to the present invention works on the principles of pulse tuning of the exhaust system.
  • the chamber of a pre-determined volume is connected directly or by a tube of pre-determined diameter and length to header pipe at a developed distance preferably ranging from 40% to 60% of the total developed length of header pipe from the face of the exhaust flange.
  • the two torque peaks are produced by the combination of reflection of pressure waves at the end of header pipe and that at the mouth of chamber.
  • an improved exhaust system comprises of a header pipe small (11), an exhaust flange (12), a connecting tube (13), a chamber (14), a tube (16), a header pipe large (17), a nipple (19), a washer (20), a bolt (21) and bracket (18).
  • Fig.1, 1 A and 1B illustrate a typical exhaust system and its location according to the prior art. It consists of header pipe (1) one end of which is assembled with flange (2). The flange (2) is connected to cylinder head (not shown) of the engine with suitable bolts or studs and nuts. The other end of the header pipe is either welded or assembled to the muffler (3). Exhaust gases from the cylinder head are led to the said header pipe and then to the muffler and then released to the atmosphere.
  • the heat shield (4) provided on the muffler guards the rider and pillion from the heat of the exhaust system. This exhaust system is well known and does not need any detailed explanation.
  • Fig 2 illustrates typical wide open throttle torque curve of a typical engine fitted with the exhaust system according to prior art. It is observed from the curve that the peak torque is occurring at around 6500 engine RPM.
  • FIGs 3 , 3A , 3B and 4 illustrate an improved exhaust system according to the invention having a chamber (14), a connecting pipe (13) connecting said chamber to tube (16), said tube (16) being positioned between a front header pipe (11) and rear header pipe (17), the header pipe (11) being provided with an exhaust flange (12) and said rear header pipe (17) is connected to the said muffler (15).
  • the connecting pipe (13) could be welded directly to header pipe (1) as shown in fig (1 ).
  • the said chamber (14) could be welded directly to header pipe (1) as shown in fig (1 ).
  • the header pipe (1) is split as a front header pipe (11) and a rear header pipe (17).
  • the ends of said front and rear header pipes connecting to the engine exhaust and the said muffler are identical to the header pipe (1).
  • the developed length of said front header pipe (11) is decided considering the parameters like engine power, torque requirement at various engine revolutions, diameter of the pipe etc.
  • a tube (16) is welded joining the rear header pipe (17) and the said chamber (14).
  • the muffler (15) is connected to rear header pipe (17).
  • the said connecting tube (13) is provided at a point, preferably 40% to 60% of developed length of header pipe (that is the combined length of the front and rear header pipes and connecting tube) from the face of said exhaust flange (12) along the length of the said header pipe.
  • the connecting tube (13) or tube (16) is provided with a nipple (19).
  • the other end of nipple is threaded which is closed by means of a washer (20) and a bolt (21).
  • the said washer and bolt can be removed to allow for the convenient measurement of exhaust gas emission values by a suitable instrument.
  • Bracket (18) is provided between the chamber (14) and rear header pipe from strength considerations.
  • the chamber (14) is of a pre-determined volume and is made of two sheet metal halves welded together. Conveniently, reinforcing dimples (25) are added to the top surface (24) of the chamber (14) to provide rigidity and reduce noise caused by the vibration of this surface.
  • An additional convenient feature of the present embodiment is the location of the bottom surface (26) of the chamber (14) to be slightly higher and sloped downwards towards the connecting pipe 13. This allows for any accumulated moisture to drain from the chamber (14) back into the exhaust system.
  • the length of connecting pipe (13) is so chosen that the desired result of improvement in torque characteristics is achieved and the said chamber is well located beneath the motorcycle in available space without sacrificing ground clearance. This is a very simple matter of design and in some cases can be readily determined with non-inventive trial and error.
  • Fig 3A and 3B illustrates a typical such location.
  • the shape of the chamber and construction can vary with location on motorcycle.
  • Fig 5 illustrates typical wide open throttle torque performance curves of the engine fitted with the exhaust system according to depicted embodiment of the invention with respect to the engine speed in RPM. It can be observed that the torque of the engine between the speed range of 3000 to 5000 RPM which is the normal vehicle driving zone for a typical motorcycle has substantially improved, while maintaining substantially the original toque at engine speeds beyond 7000 RPM which is important for the performance of the engine. The applicants have carried out substantial testing and concluded that improvement in torque of a typical engine in the speed range between 3000 to 5000 RPM is of the order of 5 to 7%. Also, the vehicles do meet statutory requirements of noise level.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
  • Characterised By The Charging Evacuation (AREA)
EP05815839A 2004-08-06 2005-08-03 An improved exhaust system of a single cylinder four stroke spark ignition engine Not-in-force EP1789660B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN851MU2004 2004-08-06
PCT/IN2005/000254 WO2006027797A1 (en) 2004-08-06 2005-08-03 An improved exhaust system of a single cylinder four stroke spark ignition engine

Publications (2)

Publication Number Publication Date
EP1789660A1 EP1789660A1 (en) 2007-05-30
EP1789660B1 true EP1789660B1 (en) 2010-05-12

Family

ID=35645689

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05815839A Not-in-force EP1789660B1 (en) 2004-08-06 2005-08-03 An improved exhaust system of a single cylinder four stroke spark ignition engine

Country Status (18)

Country Link
EP (1) EP1789660B1 (xx)
JP (1) JP2008509324A (xx)
CN (1) CN1993539B (xx)
AP (1) AP2840A (xx)
AR (1) AR050204A1 (xx)
AT (1) ATE467751T1 (xx)
BR (1) BRPI0514158B1 (xx)
CR (1) CR8898A (xx)
DE (1) DE602005021230D1 (xx)
EC (1) ECSP077216A (xx)
EG (1) EG24937A (xx)
ES (1) ES2348516T3 (xx)
GT (1) GT200500395A (xx)
MX (1) MX2007000792A (xx)
MY (1) MY139239A (xx)
TW (1) TW200613638A (xx)
WO (1) WO2006027797A1 (xx)
ZA (1) ZA200700202B (xx)

Family Cites Families (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3254484A (en) 1964-01-23 1966-06-07 Kopper John Stephen Acoustical resonance apparatus for increasing the power output of an internal combustion engine
DE2022851C3 (de) * 1970-05-11 1974-05-09 Thomas Richard Birmingham Mich. Cassel (V.St.A.) Auspuffanlage für Brennkraftmaschinen
JPS5493613U (xx) * 1977-12-15 1979-07-03
JPS5692322A (en) * 1979-12-24 1981-07-27 Yamaha Motor Co Ltd Exhaust pipe for vehicle
DD228587C2 (de) * 1984-11-05 1987-11-18 Zschopau Motorrad Veb Auslasssystem fuer eine zweitakt-brennkraftmaschine
US4779415A (en) 1986-11-26 1988-10-25 Arvin Industries, Inc. Manifold tuning structure
JP2562617B2 (ja) * 1987-09-14 1996-12-11 ヤマハ発動機株式会社 エンジンの排気制御装置
CN2032251U (zh) * 1988-05-10 1989-02-08 北京市劳动保护科学研究所 排气消声器
JPH01173342U (xx) * 1988-05-20 1989-12-08
JPS6429614A (en) * 1988-06-16 1989-01-31 Honda Motor Co Ltd Exhaust controller
JPH0216326A (ja) * 1988-06-30 1990-01-19 Suzuki Motor Co Ltd 排気装置
JPH0364624A (ja) * 1989-07-31 1991-03-20 Nissan Motor Co Ltd 内燃機関の排気制御装置
JPH0364623A (ja) * 1989-07-31 1991-03-20 Nissan Motor Co Ltd 内燃機関の排気制御装置
DE4040721A1 (de) * 1989-12-21 1991-07-04 Sebring Auspuff Schalldaempferanlage
AT395562B (de) * 1990-10-08 1993-01-25 M T A Motech Austria S Schatze Auspuffanlage mit katalysator fuer motorraeder
CN2132838Y (zh) * 1991-11-05 1993-05-12 陈自力 车辆用的可调式消声器
DE4330129C2 (de) * 1993-09-06 2002-08-29 Bayerische Motoren Werke Ag Abgasanlage einer Brennkraftmaschine
JPH10332051A (ja) * 1997-05-27 1998-12-15 Inax Corp Ｔ字型壁貫通金具
JP3800456B2 (ja) 1997-08-26 2006-07-26 カルソニックカンセイ株式会社 車両用排気消音装置
JP3410937B2 (ja) * 1997-09-03 2003-05-26 本田技研工業株式会社 ２サイクルエンジン用マフラー装置
JP4245283B2 (ja) * 2001-05-17 2009-03-25 クボタシーアイ株式会社 インサーション管からの分岐方法および分岐構造
US7510050B2 (en) * 2004-01-27 2009-03-31 Emler Don R Vehicle exhaust systems
US7926338B2 (en) * 2009-08-12 2011-04-19 GM Global Technology Operations LLC Method for detecting local runout of a tire

Also Published As

Publication number Publication date
EP1789660A1 (en) 2007-05-30
EG24937A (en) 2011-01-11
BRPI0514158B1 (pt) 2019-06-04
ZA200700202B (en) 2008-02-27
ES2348516T3 (es) 2010-12-07
BRPI0514158A (pt) 2008-06-03
WO2006027797A1 (en) 2006-03-16
AR050204A1 (es) 2006-10-04
AP2007003911A0 (en) 2007-02-28
MX2007000792A (es) 2007-04-09
CN1993539A (zh) 2007-07-04
ECSP077216A (es) 2007-02-28
ATE467751T1 (de) 2010-05-15
DE602005021230D1 (de) 2010-06-24
CN1993539B (zh) 2010-04-14
TW200613638A (en) 2006-05-01
MY139239A (en) 2009-09-30
CR8898A (es) 2007-08-28
JP2008509324A (ja) 2008-03-27
AP2840A (en) 2014-02-28
GT200500395A (es) 2007-09-25

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