| abstract |
PROBLEM TO BE SOLVED: To provide a piston ring formed with a hard carbon film excellent in wear resistance, scuff resistance and adhesion resistance and exfoliation resistance, and of a piston ring and a piston. Provide a combination structure with a ring groove. SOLUTION: An outer peripheral surface (4) of a piston ring (1), The hard carbon film (2) continuously formed on all of the inner peripheral surface (5), the upper surface (6) and the lower surface (7) is a hard carbon film containing Si, and serves as a base film of the hard carbon film. It is preferable that a Si-containing film is formed, or that the hard carbon film is a hard carbon film containing W or W-Ni, and that a Cr film is formed as a base film of the hard carbon film, Further, it is preferable that an ion plating film, which is a hard film, is formed as a base film on the outer peripheral surface of the piston ring. |