| 摘要 |
<p>An internal combustion engine (16) having a centrifugally-responsive vacuum release mechanism (14) that relieves a vacuum within a combustion chamber (106) during the expansion stroke of an engine (16) at engine starting speeds. The vacuum release mechanism (14) is disposed adjacent to a cam (10) and engages a cam follower (34) at engine starting speeds to unseat an engine valve (82) while an engine piston (90) is moved toward a crankcase (98) and away from the combustion chamber (106). When the engine rotation speed reaches a desired kick-out speed, the centrifugal force transitions the vacuum release mechanism (14) from an engaged position to a disengaged position. The vacuum release mechanism (14) engages the cam follower (34) to separate the cam follower (34) from the cam (10) when the vacuum release mechanism (14) is in the engaged position. When the vacuum release mechanism (14) is in the disengaged position during normal operating speeds, the cam follower (34) is permitted to contact the cam (10) throughout the entire rotation of the cam (10).
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