Contoured finger follower variable valve timing mechanism

Details Contoured finger follower variable valve timing mechanism Contoured finger follower variable valve timing mechanism

F - Mech Eng,Light,Heat,Weapons

01

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123/183

F01L 1/34 (2006.01) F01L 13/00 (2006.01) F02D 13/02 (2006.01)

Patent

CA 1189401

Abstract of the Disclosure A mechanism for varying the timing of the valves of an internal combustion engine wherein an elongated finger follower for each of the intake and/or each of the exhaust valves of the engine is disposed between and movable while engaged with the cams for the respective valves and linkage means that extends between the valves and the finger followers. The proximal ends of the followers are pivotally connected to the swingable ends of a plurality of cranks, the opposite ends of the cranks being connected to a control shaft that is moun- ted for limited rotational movement about an axis adjacent and parallel to the axis of rotation of the engine camshaft. Each finger follower has a convex surface engageable with the actua- ting linkage for its associated valve and a concave control surface engageable with the cam associated with a particular valve. The control surface includes contiguous portions of decreasing and increasing radius which coact with the opening and closing flank portions of the cam associated therewith to vary the timing of the valve in accordance with the position of the follower. The decreasing and increasing radius portions of the control surface are free of discontinuities so that the finger follower can shift between its limit positions without subjecting the components of the valve train to undesirable ac- celeration rates or shocks.

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