| 摘要 |
An oil stripping piston employed on an internal combustion engine, especially aimed at elevated contact pressure and drastic reduction of lubrication oil consumption, on which a hardened surface is provided either on the top or bottom rubbing surface of the oil stripping piston ring and on the back of said oil stripping piston ring. An expander is mounted in the position selected for even distribution of rubbing wear of the hardened surface and the base material of the piston ring for maintaining a constant wear step between the said two rubbing surfaces.
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