EP1556594A2 - Orifices de transfert pour moteur deux temps - Google Patents

Orifices de transfert pour moteur deux temps

Info

Publication number
EP1556594A2
EP1556594A2 EP03774559A EP03774559A EP1556594A2 EP 1556594 A2 EP1556594 A2 EP 1556594A2 EP 03774559 A EP03774559 A EP 03774559A EP 03774559 A EP03774559 A EP 03774559A EP 1556594 A2 EP1556594 A2 EP 1556594A2
Authority
EP
European Patent Office
Prior art keywords
transfer ports
pair
exhaust port
cylinder
transfer
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
EP03774559A
Other languages
German (de)
English (en)
Other versions
EP1556594B1 (fr
EP1556594A4 (fr
Inventor
John D. Sheldon
Nagesh S. Mavinahally
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.)
Techtronic Industries Co Ltd
Original Assignee
Homelite Technologies Ltd
Techtronic Industries 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
Priority claimed from US10/264,939 external-priority patent/US20040065280A1/en
Application filed by Homelite Technologies Ltd, Techtronic Industries Co Ltd filed Critical Homelite Technologies Ltd
Priority to EP11008316.9A priority Critical patent/EP2428661A3/fr
Publication of EP1556594A2 publication Critical patent/EP1556594A2/fr
Publication of EP1556594A4 publication Critical patent/EP1556594A4/fr
Application granted granted Critical
Publication of EP1556594B1 publication Critical patent/EP1556594B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B33/00—Engines characterised by provision of pumps for charging or scavenging
    • F02B33/02—Engines with reciprocating-piston pumps; Engines with crankcase pumps
    • F02B33/04—Engines with reciprocating-piston pumps; Engines with crankcase pumps with simple crankcase pumps, i.e. with the rear face of a non-stepped working piston acting as sole pumping member in co-operation with the crankcase
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B25/00—Engines characterised by using fresh charge for scavenging cylinders
    • F02B25/14—Engines characterised by using fresh charge for scavenging cylinders using reverse-flow scavenging, e.g. with both outlet and inlet ports arranged near bottom of piston stroke
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B25/00—Engines characterised by using fresh charge for scavenging cylinders
    • F02B25/20—Means for reducing the mixing of charge and combustion residues or for preventing escape of fresh charge through outlet ports not provided for in, or of interest apart from, subgroups F02B25/02 - F02B25/18
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
    • F02B63/02—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for hand-held tools

Definitions

  • U.S. Patent 6,367,432 discloses a two-stroke cycle internal combustion engine which has a quaternary Schnurle-type scavenging system that is configured such that the capacity of a pair of second scavenging passageways are made larger than te capacity of a pair of first scavenging passageways, so that during the descending stroke of the piston, air is allowed to be introduced into the combustion actuation chamber from the second scavenging passageways prior to the introduction of the air-fuel mixture and at the same time, a relatively large quantity of air is allowed to be introduced into the combustion actuating chamber from the first scavenging passageways over a longer period of time as compared with the period of time in which air is introduced from the second scavenging passageways.
  • a method of introducing scavenged air into a cylinder of a two-stroke internal combustion engine comprising steps of providing the cylinder with an exhaust port and two pairs of transfer ports being located in closer proximity to the exhaust port than a second one of the pairs of transfer ports; opening the second pair of transfer ports to a combustion chamber of the engine by a piston of the engine as the piston moves towards a bottom dead center position before the piston opens the first pair of transfer ports; and opening the first pair of transfer ports by the piston.
  • the second pair of transfer ports is located further away from the exhaust port is opened into the combustion chamber before the first pair of transfer ports is opened into the combustion chamber.
  • the second pair of transfer ports 50 are subsequently opened. Because the second transfer ports 50 are located further away from the exhaust port 34 than the first transfer ports 48, the transfer ports located furthest away from the exhaust port 34 open first, the combination of the sequential opening of the different types of transfer ports and the angled shaped of the transfer ports combine to help prevent short circuiting of fresh unburned fuel from exiting the exhaust port 34.
  • the second transfer port opens initially, as illustrated by curve 126, while the first transfer port area is illustrated by curve 128.
  • the combined areas of the two transfer ports is illustrated by curve 130.
  • the maximum area of the first transfer ports at BDC is greater than that of the second transfer ports at BDC.
  • the second transfer ports will have a BDC area which is less than 90% of the BDC area of the first transfer ports at BDC. More preferably, the second transfer port area will be 65% -90% of the first transfer port area at BDC and most preferably, 80% -90% of the second transfer port area at BDC.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

L'invention concerne un moteur à combustion interne deux temps comprenant un cylindre et un piston monté mobile dans le cylindre. Le cylindre comprend un orifice d'échappement et des orifices de transfert. Les orifices de transfert comprennent une première paire d'orifices de transfert disposés plus près de l'orifice d'échappement qu'une seconde paire d'orifices de transfert lesquels sont disposés plus loin de l'orifice d'échappement. Les deux premiers orifices de transfert forment un angle l'un par rapport à l'autre en un premier angle d'environ 70° à environ 85°, les deux seconds orifices de transfert forment un angle l'un par rapport à l'autre en un second angle d'environ 120° à environ 150°. La décharge directionnelle d'air balayé hors des orifices de transfert établit un chemin d'écoulement de l'air balayé afin de réduire au minimum les pertes de carburant neuf non brûlé dans l'orifice d'échappement.
EP03774559A 2002-10-04 2003-10-06 Orifices de transfert pour moteur deux temps Expired - Lifetime EP1556594B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11008316.9A EP2428661A3 (fr) 2002-10-04 2003-10-06 Orifices de transfert pour moteur deux temps

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US452079 1989-12-18
US264939 1994-06-24
US10/264,939 US20040065280A1 (en) 2002-10-04 2002-10-04 Two-stroke engine transfer ports
US10/452,079 US20040065281A1 (en) 2002-10-04 2003-05-30 Two-stroke engine transfer ports
PCT/US2003/031470 WO2004033869A2 (fr) 2002-10-04 2003-10-06 Orifices de transfert pour moteur deux temps

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP11008316.9 Division-Into 2011-10-14

Publications (3)

Publication Number Publication Date
EP1556594A2 true EP1556594A2 (fr) 2005-07-27
EP1556594A4 EP1556594A4 (fr) 2010-04-28
EP1556594B1 EP1556594B1 (fr) 2011-12-21

Family

ID=32095657

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03774559A Expired - Lifetime EP1556594B1 (fr) 2002-10-04 2003-10-06 Orifices de transfert pour moteur deux temps

Country Status (4)

Country Link
EP (1) EP1556594B1 (fr)
JP (1) JP2006502348A (fr)
AU (1) AU2003282673A1 (fr)
WO (1) WO2004033869A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4912849B2 (ja) * 2006-12-01 2012-04-11 ハスクバーナ・ゼノア株式会社 層状掃気２サイクルエンジン
JP5553552B2 (ja) 2009-07-24 2014-07-16 株式会社やまびこ ２サイクルエンジン

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4447215A1 (de) * 1994-02-23 1995-08-24 Daihatsu Motor Co Ltd Zweitakt-Brennkraftmaschine
WO1996031691A1 (fr) * 1995-04-07 1996-10-10 Aktiebolaget Electrolux Cylindre
DE19707767A1 (de) * 1996-03-01 1997-11-06 Kioritz Corp Zweitakt-Brennkraftmaschine
US5870981A (en) * 1995-04-04 1999-02-16 Andreas Stihl Two-stroke engine having several transfer channels
US6223705B1 (en) * 1998-07-17 2001-05-01 Kioritz Corporation Two-stroke internal combustion engine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4447215A1 (de) * 1994-02-23 1995-08-24 Daihatsu Motor Co Ltd Zweitakt-Brennkraftmaschine
US5870981A (en) * 1995-04-04 1999-02-16 Andreas Stihl Two-stroke engine having several transfer channels
WO1996031691A1 (fr) * 1995-04-07 1996-10-10 Aktiebolaget Electrolux Cylindre
DE19707767A1 (de) * 1996-03-01 1997-11-06 Kioritz Corp Zweitakt-Brennkraftmaschine
US6223705B1 (en) * 1998-07-17 2001-05-01 Kioritz Corporation Two-stroke internal combustion engine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2004033869A2 *

Also Published As

Publication number Publication date
AU2003282673A1 (en) 2004-05-04
WO2004033869A2 (fr) 2004-04-22
JP2006502348A (ja) 2006-01-19
WO2004033869A3 (fr) 2004-09-23
EP1556594B1 (fr) 2011-12-21
EP1556594A4 (fr) 2010-04-28

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