GB1243551A - Compression relief for internal combustion engines - Google Patents

Compression relief for internal combustion engines

Info

Publication number
GB1243551A
GB1243551A GB2717468A GB2717468A GB1243551A GB 1243551 A GB1243551 A GB 1243551A GB 2717468 A GB2717468 A GB 2717468A GB 2717468 A GB2717468 A GB 2717468A GB 1243551 A GB1243551 A GB 1243551A
Authority
GB
United Kingdom
Prior art keywords
valve
gas
piston
compression stroke
flow
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.)
Expired
Application number
GB2717468A
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.)
Briggs and Stratton Corp
Original Assignee
Briggs and Stratton Corp
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 Briggs and Stratton Corp filed Critical Briggs and Stratton Corp
Priority to GB2717468A priority Critical patent/GB1243551A/en
Publication of GB1243551A publication Critical patent/GB1243551A/en
Expired 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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/08—Shape of cams
    • 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
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L2013/0089—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque with means for delaying valve closing
    • F01L2013/0094—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque with means for delaying valve closing with switchable clamp for keeping valve open

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

1,243,551. Relieving compression. BRIGGS & STRATTON CORP. June 7, 1968, No.27174/68. Heading F1K. Means for facilitating starting of an internalcombustion engine comprises orifice means 16 providing an outlet from the engine combustion chamber through which gas can escape during the compression stroke, gas flow actuable valve means 10 operable to substantially close the outlet in response to the flow of gas through the orifice means and means 13 connected with the piston and operatively associated with the valve means for so controlling response of the valve means to rate of flow of gas through the orifice means that the valve means is actuated to its substantially closed position upon attainment of a critical value of rate of flow of gas through the orifice means, which critical value depends upon the position of the piston in the compression stroke and decreases through the compression stroke relative to the ratio of the piston velocity to crank-shaft velocity, the critical value approaching zero at a point in piston travel which precedes the end of the compression stroke and is no later than the point in the piston motion at which ignition is intended to occur. The invention is described as applied to an inlet valve 10 but it could be applied to an exhaust valve or even to a valve separate from the inlet and exhaust valves.
GB2717468A 1968-06-07 1968-06-07 Compression relief for internal combustion engines Expired GB1243551A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2717468A GB1243551A (en) 1968-06-07 1968-06-07 Compression relief for internal combustion engines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2717468A GB1243551A (en) 1968-06-07 1968-06-07 Compression relief for internal combustion engines

Publications (1)

Publication Number Publication Date
GB1243551A true GB1243551A (en) 1971-08-18

Family

ID=10255406

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2717468A Expired GB1243551A (en) 1968-06-07 1968-06-07 Compression relief for internal combustion engines

Country Status (1)

Country Link
GB (1) GB1243551A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6394054B1 (en) 2001-01-15 2002-05-28 Tecumseh Products Company Mechanical compression and vacuum release
US6536393B2 (en) 2000-09-11 2003-03-25 Tecumseh Products Company Mechanical compression and vacuum release
US6539906B2 (en) 2001-03-30 2003-04-01 Tecumseh Products Company Mechanical compression and vacuum release
US6782861B2 (en) 2001-02-09 2004-08-31 Briggs & Stratton Corporation Vacuum release mechanism

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6536393B2 (en) 2000-09-11 2003-03-25 Tecumseh Products Company Mechanical compression and vacuum release
US6394054B1 (en) 2001-01-15 2002-05-28 Tecumseh Products Company Mechanical compression and vacuum release
US6782861B2 (en) 2001-02-09 2004-08-31 Briggs & Stratton Corporation Vacuum release mechanism
US6874457B2 (en) 2001-02-09 2005-04-05 Briggs & Stratton Corporation Vacuum release mechanism
US6539906B2 (en) 2001-03-30 2003-04-01 Tecumseh Products Company Mechanical compression and vacuum release

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