| 摘要 |
A piston ring comprising a generally I shaped oil-scraping oil ring which has upper and lower side rails and a considerably thin web connecting the side rails, and which has an outer peripheral channel for receiving scraped oil and an inner peripheral groove for receiving coil expander, and an annular coil expander which is located in the inner peripheral groove so that the coil expander bears against the upper and lower side rails substantially at two points, the coil expander being spaced from the web of the oil ring with a slight gap therebetween.
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