Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1981-06-08
1983-05-10
Cuchlinski, Jr., William A.
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
F01L 134
Patent
active
043824285
ABSTRACT:
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 mounted 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 actuating 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 acceleration rates or shocks.
REFERENCES:
patent: 1677552 (1928-07-01), Diamant
patent: 2260983 (1981-10-01), Walker
patent: 2934052 (1960-04-01), Longenecker
patent: 3413965 (1968-12-01), Gavasso
patent: 4205634 (1980-06-01), Tourtelot, Jr.
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