Engine valve driving device

Details Engine valve driving device Engine valve driving device

1990-12-21

1992-01-07

Cross, E. Rollins

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9025, 123 9017, F01L 134

Patent

active

050781022

ABSTRACT:
An engine valve driving device includes a rocker arm attached at one end to a valve stem and carrying at its opposite end a roller which engages the surfaces of a stepped cam plate. The cam plate has a horizontal surface which includes upper and lower portions joined by an inclined portion so that horizontal reciprocating motion operates the rocker arm and the connected valve. The cam plate is connected to a rotary cam crank shaft so that rotation of the crank shaft produces linear reciprocating motion in the cam plate. The connection between the cam shaft and the cam plate is adjustable, as by a hydraulic cylinder, to vary the gap between the cam plate and the cam shaft and to thereby vary the timing of the motion of the valve with respect to the rotation of the cam shaft. In an alternative form, the connection between the cam and the cam shaft may be a pivotal lever, with the pivot point of the lever being movable to provide timing adjustment.

REFERENCES:
patent: 2832327 (1958-04-01), Lorenz
patent: 2954017 (1960-09-01), Forstner
patent: 3641988 (1972-02-01), Torazza et al.
patent: 4829949 (1989-05-01), Holmer
patent: 4898130 (1990-02-01), Parsons

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