| 摘要 |
A valve control system for controlling both the amount of valve lift (FIG. 7B) and the timing of the valve lift (FIG. 7A) of an internal combustion engine poppet valve (19). The system includes a rocker arm (37) having an engagement surface (69) and a cam member (51) disposed for to and fro movement relative to a camshaft (27) and having a cam surface (71) in generally face-to-face relationship to the engagement surface (69). A first cam follower (55) engages the cam profile (29) on the camshaft, and a second cam follower (61,70) is disposed between the engagement surface (69) and the cam surface (71), and is connected to the first cam follower (55) by a rigid follower linkage (59). A control arrangement (63) changes the to and fro position of the cam member (51) to vary valve lift, and an adjustable timing linkage (57) moves the first cam follower, to advance or retard the valve timing.
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