OIL RING
PROBLEM TO BE SOLVED: To reduce friction resistance in an oil ring without impairing an oil control function.SOLUTION: An oil ring 13 is installed in an oil ring groove 8 that is provided concavely in an outer peripheral surface of a piston 4, and comprises an upper side rail 16 and a lower side rai...
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Format: | Patent |
Sprache: | eng ; jpn |
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