| 摘要 |
PURPOSE:To prevent abnormal abrasion such as scuffing or the like caused by sliding of a nitriding layer and to prevent upper and lower striking abrasion by upper and lower nitriding layers by plating or flame spraying the outer peripheral surface of a piston ring without nitriding treatment. CONSTITUTION:A nitriding layer 2 is disposed on the whole surface of a piston ring except the outer peripheral surface. Subsequently, a plating or flame spraying layer 3 is disposed on the outer peripheral surface 11 of the piston ring 1. Chrome plating, dispersion plating or the like is selected depending upon the congeniality with an engine, or iron group or molybdenum is selected for flame spraying.
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