Device for operating a valve in an internal combustion engine

Details Device for operating a valve in an internal combustion engine Device for operating a valve in an internal combustion engine

1993-06-11

1994-05-10

Argenbright, Tony M.

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9016, 123 9017, 123 906, F01L 134, F01L 108

Patent

active

053098722

ABSTRACT:
The portion of the profile of an asymmetric cam which controls the closure of a valve in an internal combustion engine is steep enough to ensure that, when the engine speed exceeds a threshold value, the valve closes, without contact between the valve and the cam , within a period of time which is substantially fixed as the engine speed varies, so that the angle of the cam upon closure increases with increases in the rate of rotation of the cam. The active surface of a bucket-type tappet interposed between the cam and the valve has a flat portion substantially perpendicular to the line of movement of the tappet and a curved portion which is connected to the flat portion and has a uniform radius of curvature so as to have a convex region facing the cam.

REFERENCES:
patent: 3272189 (1966-09-01), Turkish
patent: 4424790 (1984-01-01), Curtil
patent: 4538559 (1985-09-01), Imamura et al.
patent: 4878462 (1989-11-01), Kurisu et al.
patent: 4942854 (1990-07-01), Shirai et al.
patent: 5113813 (1992-05-01), Rosa
patent: 5136887 (1992-08-01), Elrod et al.
patent: 5178105 (1993-01-01), Norris

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