Valve gear for internal combustion engines
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United States of America Patent
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-
Jan 12, 1993
Grant Date -
N/A
app pub date -
Aug 22, 1991
filing date -
Aug 23, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Valve gear for an internal combustion engine includes a first cam mounted to rotate about a first axis, a second cam mounted to rotate about a second axis which is substantially parallel to the first axis, a phase-change mechanism arranged selectively to vary the phase of one of the cams relative to the other, a cam follower which has first and second contact surfaces arranged to be engaged by the first and second cams, respectively. The profile of the first cam includes an ascending portion to move the valve member in a second direction opposite to the first direction and a descending ramp to control movement of the cam follower with respect to the valve member. The profile of the second cam includes a descending portion to control movement of the valve member in the first direction and an ascending ramp to control movement of the cam follower with respect to the valve member. The phase of the two cams is such that the times for which the ascending and descending ramps contact the follower at least partially overlap at a time during which the valve member is stationary in the closed position.
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