Mechanical compression and vacuum release mechanism
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United States of America Patent
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Feb 12, 2008
Grant Date -
Apr 5, 2007
app pub date -
Aug 7, 2006
filing date -
Jun 7, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Mechanical compression and vacuum release mechanisms for internal combustion engines. The compression and vacuum release mechanism may include a pair of centrifugally responsive flyweights pivotally mounted to the cam gear. One of the flyweights actuates a vacuum release member having a vacuum release cam and the other of the flyweights actuates a compression release member having a compression release cam. In another embodiment, the compression and vacuum release mechanism includes a single flyweight having structure associated therewith to actuate a vacuum release member and a compression release member having respective vacuum and compression release cams. The compression and vacuum release cams are in lifting engagement with the valve actuation structure of one of the intake or exhaust valves of the engine during engine starting to relieve compression and vacuum within the combustion chamber and thereby facilitate easier engine starting. After the engine is started and reaches running speed, centrifugal force causes the compression and vacuum release cams to move out of engagement with the valve actuation structure of the intake or exhaust valve to allow the engine to operate normally.
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