| 摘要 |
PURPOSE: An oil ring structure is provided to improve the side sealing of an oil ring by increasing the shoulder part angle when driving an engine at a low speed, and improve the outer peripheral sealing of the oil ring by decreasing the shoulder part angle in the opposite case, thereby reducing the oil consumption. CONSTITUTION: In an oil ring structure, an expander(10) has a tapered mounting groove(12) in the center, and the groove becomes narrower from its inlet part toward the inside. A shoulder part angle control ring(13) is fitted into the mounting groove for controlling a shoulder part angle according to the temperature change of a combustion chamber. The shoulder part angle control ring is formed of a material to be retracted or expanded easily by the temperature change, wherein the thermal expansion coefficient of the shoulder part angle control ring is higher than the expander.
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