VARIABLE VALVE TIMING MECHANISM

摘要

VARIABLE VALVE TIMING MECHANISM Mechanism for varying the timing of the valves of an internal combustion engine to obtain optimum efficiency and performance of the engine throughout a substantial portion of its operating speed range, wherein cam means for at least each intake valve is mounted on a rotatable cam shaft of the engine. Each cam means includes at least one and preferably a pair of axially spaced first cam members contoured to provide a first timing for their associated valves such as to provide optimum performance throughout one operating speed range of the engine and a second cam member of smaller size than and positioned between the first cam members and contoured to provide optimum performance throughout another operating speed range. Timing of the valves is normally controlled by the first cam members acting through linkage connected to the valves, and a plurality of elongated finger followers are provided for coaction with the second cam members to render them effective to control the timing of the valves. The finger followers are shiftable to different positions of engagement with the second cam members so that the timing of the valves is controlled either only by the first cam members, or partially by both the first and second cam members, or only by the second cam members.