JPS5554616A - Variable valve lift engine - Google Patents

Variable valve lift engine

Info

Publication number
JPS5554616A
JPS5554616A JP12608578A JP12608578A JPS5554616A JP S5554616 A JPS5554616 A JP S5554616A JP 12608578 A JP12608578 A JP 12608578A JP 12608578 A JP12608578 A JP 12608578A JP S5554616 A JPS5554616 A JP S5554616A
Authority
JP
Japan
Prior art keywords
cam
roller
engine
valve lift
held
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
JP12608578A
Other languages
Japanese (ja)
Other versions
JPS6027801B2 (en
Inventor
Kazuo Takahashi
Masaaki Takizawa
Noboru Matsubara
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.)
Toyota Motor Corp
Original Assignee
Toyota Motor 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 Toyota Motor Corp filed Critical Toyota Motor Corp
Priority to JP12608578A priority Critical patent/JPS6027801B2/en
Publication of JPS5554616A publication Critical patent/JPS5554616A/en
Publication of JPS6027801B2 publication Critical patent/JPS6027801B2/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
    • F01L13/0015—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
    • F01L13/0036—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • F01L13/0042—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction with cams being profiled in axial and radial direction

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)

Abstract

PURPOSE:To provide a variable valve lift engine, in which a roller is supported in freely rotatable manner at the portion or rocker arm where it is held in contact with cam and said roller is shaped to be circular in its cross section taken in the direction of rocker shaft, whereby occurrnece of wear and pitching at the portion of cam surface where it is held in contact with rocker arm can be prevented. CONSTITUTION:In high-speed operation of engine, three-dimensional cam 33 is shifted to the left in the drawing by hydraulic cylinder 35, so that roller 27 is held in contact with the right side 33b of cam 33. In this state, lift of cam 33 is sufficiently large to provide a cam phase and a valve lift necessary for high-speed operarion of engine. In shifting engine operation from its high-speed operation to low-speed operation, cam 33 is shifted to the right. Here, roller 27 rotatably supported by rocker arm 19 rolls helically on the surface of cam 33 since cam 33 is rotated together with cam shaft 31. Further, since roller 27 is shaped to have a circular cross section, it is shifted smoothly to the left of cam 33 without causing wear and pitching of the roller 27 and cam 33.
JP12608578A 1978-10-16 1978-10-16 variable valve lift engine Expired JPS6027801B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12608578A JPS6027801B2 (en) 1978-10-16 1978-10-16 variable valve lift engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12608578A JPS6027801B2 (en) 1978-10-16 1978-10-16 variable valve lift engine

Publications (2)

Publication Number Publication Date
JPS5554616A true JPS5554616A (en) 1980-04-22
JPS6027801B2 JPS6027801B2 (en) 1985-07-01

Family

ID=14926225

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12608578A Expired JPS6027801B2 (en) 1978-10-16 1978-10-16 variable valve lift engine

Country Status (1)

Country Link
JP (1) JPS6027801B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57164205U (en) * 1981-04-13 1982-10-16
US4794893A (en) * 1986-08-08 1989-01-03 Mazda Motor Corporation Engine valve driving apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57164205U (en) * 1981-04-13 1982-10-16
JPS633368Y2 (en) * 1981-04-13 1988-01-27
US4794893A (en) * 1986-08-08 1989-01-03 Mazda Motor Corporation Engine valve driving apparatus

Also Published As

Publication number Publication date
JPS6027801B2 (en) 1985-07-01

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