Apparatus and method for maintaining controlled orientation of a roller lifter follower used in conjunction with a variable phased valve lifter
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United States of America Patent
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May 18, 2004
Grant Date -
Apr 8, 2004
app pub date -
Oct 8, 2002
filing date -
Oct 8, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a variable phased valve lifter of an internal combustion engine, a roller lifter is allowed to move along a constraining member of a constraining mechanism, and the constraining mechanism is allowed to move freely in a direction substantially parallel to a line perpendicular to the flat surface machined onto the roller lifter. As the roller lifter moves through its arcuate path, the parallel flat surface(s) of the roller lifter will slide across the constraining member(s) of the constraining mechanism, and end members of the constraining mechanism slide fore-and-aft within stationary blocks. The roller lifter is thus prevented from rotating about its longitudinal axis as it moves in arcuate fashion in cooperation with the constraining mechanism, maintaining line contact between the roller and cam lobe of the camshaft.
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