EP0167691A3 - Decompression apparatus for engines - Google Patents

Decompression apparatus for engines Download PDF

Info

Publication number
EP0167691A3
EP0167691A3 EP84307380A EP84307380A EP0167691A3 EP 0167691 A3 EP0167691 A3 EP 0167691A3 EP 84307380 A EP84307380 A EP 84307380A EP 84307380 A EP84307380 A EP 84307380A EP 0167691 A3 EP0167691 A3 EP 0167691A3
Authority
EP
European Patent Office
Prior art keywords
cam
engine
periphery
valve
decompression
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Withdrawn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
EP84307380A
Other languages
German (de)
French (fr)
Other versions
EP0167691A2 (en
Inventor
Hiroshi Yamaguchi
Hiroaki Kaneko
Yasuyo Hisano
Akio Iwashita
Masahiro Terai
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.)
Subaru Corp
Original Assignee
Fuji Jukogyo KK
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 Fuji Jukogyo KK filed Critical Fuji Jukogyo KK
Publication of EP0167691A2 publication Critical patent/EP0167691A2/en
Publication of EP0167691A3 publication Critical patent/EP0167691A3/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/08—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for decompression, e.g. during starting; for changing compression ratio
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/08—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for decompression, e.g. during starting; for changing compression ratio
    • F01L13/085—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for decompression, e.g. during starting; for changing compression ratio the valve-gear having an auxiliary cam protruding from the main cam profile
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2820/00—Details on specific features characterising valve gear arrangements
    • F01L2820/02—Formulas
    • 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
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

For automatic depression during starting, a decompress­ ion device (9) is rotatably supported in the cam gear (6) on the camshaft (1) of an engine. The device has a shaft (10) mounted in the cam gear, a U-shaped portion (11), and a decompression cam (12) formed on the shaft and having a semicircular cross section. Inlet valve cam (4) has a recess (4a) at a part of its periphery and the decompression cam (12) is positioned in that recess (4a). A centrifugally rotated weight (13) is mounted on the cam gears and is operatively engaged with the U shaped portion (11) of the decompress­ ion device (9). The weight (13) and the decompression device (9) are so arranged that when the rotational speed of the camshaft at starting is below a speed which causes the reverse rotation of the engine, the periphery of the decom­ pression cam (12) projects beyond the periphery of valve cam (4) to open the corresponding valve for reducing the compression pressure in the engine, and that when the rotational speed exceeds the speed which causes the reverse rotation of the engine, the periphery of the decompression cam (12) retracts to or below the periphery of the valve cam (4) to close the valve during at least a part of the compression stroke of the engine.
EP84307380A 1984-07-10 1984-10-26 Decompression apparatus for engines Withdrawn EP0167691A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP14378684A JPH066888B2 (en) 1984-07-10 1984-07-10 Engine decompression device
JP143786/84 1984-07-10

Publications (2)

Publication Number Publication Date
EP0167691A2 EP0167691A2 (en) 1986-01-15
EP0167691A3 true EP0167691A3 (en) 1986-07-30

Family

ID=15346962

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84307380A Withdrawn EP0167691A3 (en) 1984-07-10 1984-10-26 Decompression apparatus for engines

Country Status (4)

Country Link
EP (1) EP0167691A3 (en)
JP (1) JPH066888B2 (en)
KR (1) KR860001276A (en)
DE (1) DE167691T1 (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4696266A (en) * 1985-05-14 1987-09-29 Fuji Jukogyo Kabushiki Kaisha Decompression apparatus for engines
JPH0250107U (en) * 1988-10-03 1990-04-09
US4892068A (en) * 1989-06-09 1990-01-09 Kohler Co. Geared automatic compression release for an internal combustion engine
EP0425899B1 (en) * 1989-11-02 1994-01-26 Kubota Corporation Engine with mechanical governor and decompression device
DE19636811C2 (en) * 1996-09-11 2000-06-15 Hatz Motoren Automatic decompression
US6055952A (en) * 1998-06-08 2000-05-02 Industrial Technology Research Institute Automatic decompression device
JP2005105972A (en) * 2003-09-30 2005-04-21 Fuji Heavy Ind Ltd Engine decompression device
JP4777955B2 (en) * 2007-10-03 2011-09-21 本田技研工業株式会社 Engine decompression device
JP2015224577A (en) * 2014-05-27 2015-12-14 ヤマハ発動機株式会社 Engine and vehicle
AU2018431113A1 (en) 2018-07-05 2021-01-21 Honda Motor Co., Ltd. Engine decompression device and engine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3362390A (en) * 1966-02-09 1968-01-09 Wisconsin Motor Corp Automatic compression release
US3901199A (en) * 1974-06-10 1975-08-26 Briggs & Stratton Corp Automatic compression relief mechanism

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3362390A (en) * 1966-02-09 1968-01-09 Wisconsin Motor Corp Automatic compression release
US3901199A (en) * 1974-06-10 1975-08-26 Briggs & Stratton Corp Automatic compression relief mechanism

Also Published As

Publication number Publication date
EP0167691A2 (en) 1986-01-15
JPH066888B2 (en) 1994-01-26
JPS6123816A (en) 1986-02-01
DE167691T1 (en) 1986-04-10
KR860001276A (en) 1986-02-24

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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

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17P Request for examination filed

Effective date: 19841103

AK Designated contracting states

Designated state(s): DE FR GB IT

ITCL It: translation for ep claims filed

Representative=s name: STUDIO BIANCHETTI

EL Fr: translation of claims filed
DET De: translation of patent claims
PUAL Search report despatched

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AK Designated contracting states

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Designated state(s): DE FR GB IT

17Q First examination report despatched

Effective date: 19871211

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

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19880422

RIN1 Information on inventor provided before grant (corrected)

Inventor name: TERAI, MASAHIRO

Inventor name: KANEKO, HIROAKI

Inventor name: IWASHITA, AKIO

Inventor name: HISANO, YASUYO

Inventor name: YAMAGUCHI, HIROSHI