| 摘要 |
PROBLEM TO BE SOLVED: To provide a piston ring avoiding edge loading and excellent in scuff resistance and abrasion resistance.SOLUTION: A first curve surface of an outer peripheral slide surface passing the central axis of a piston ring and appearing on a cross section parallel to the central axis is formed into an externally convex shape, and a curvature radius is continuously increased from a combustion chamber side to a crank chamber side. |
