Variable valve lift/timing mechanism

Details Variable valve lift/timing mechanism Variable valve lift/timing mechanism

1986-06-26

1988-02-16

Myhre, Charles J.

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9027, 123 9046, 123 9055, F01L 3114

Patent

active

047248220

ABSTRACT:
A variable valve lift and timing valve train mechanism includes a rocker arm having one end thereof operatively engaged by a valve actuator, a reaction member having one end thereof engaging an eccentric which can be rotated to change the angular position of the reaction member; a hydraulic lash adjuster including a plunger being operatively positioned in spaced apart relationship relative to the free stem end of an associate valve and substantially coaxial therewith, the plunger having an outboard pivot end projecting toward the stem of the valve, an opposite end of the rocker arm or reaction member pivotably engaging the stem of the valve while the other end pivotably engages the outboard pivot end of the plunger. The rocker arm and the reaction member intermediate their ends having opposed working surfaces one of which is flat and the other having a predetermined cam surface profile which is adapted to cooperate with the flat working surface which when engaged is operative to effect pivotal movement of one of the rocker arm or reaction member in a valve opening direction. The point of line contact between the cam surface against the flat working surface and the geometry of the cam surface cooperate to control the amount of valve lift and its timing.

REFERENCES:
patent: 3413965 (1968-12-01), Gavasso
patent: 4438736 (1984-03-01), Hara et al.
patent: 4484546 (1984-11-01), Burandt
patent: 4498432 (1985-02-01), Hara et al.
patent: 4526142 (1985-07-01), Hara et al.
patent: 4539951 (1985-09-01), Hara et al.
patent: 4567861 (1986-02-01), Hara et al.

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