| 摘要 |
A variable oil ring compression mechanism provides for real-time cyclic variation of piston ring tension in an operating internal combustion engine. A cam is situated in the gap of a piston oil control ring, the cam affixed to a shaft secured to a pivot plate positioned within the body of the piston, wherein the pivot plate is adapted to oscillate in a follower-style rocking motion responsive to the rotary movement of a connecting rod boss positioned in close proximity with the plate. In a preferred form, the cam is situated between ends of an expander ring positioned between oil scrapper rails in the bottom groove of the piston.
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