| 摘要 |
PROBLEM TO BE SOLVED: To provide an oil scraper piston ring having a high shape identical characteristic to be embodied at a low manufacturing cost and loaded with a spring stress, capable of optimizing the resilience of piston ring, allowing easy assembly, and capable of reducing the stress in the region of minimum radius wall thickness. SOLUTION: The oil scraper piston ring 1 is furnished with a notch 4 approximately in the form of a mushroom consisting of a seam-form region 5 bounded by boundary edges 7 and 8 positioned parallel approximately at a spacing of b and a region 6 approximately in an elliptical shape tying to the region 5 where the distance between its boundary parts 9 and 10 is represented by a.
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