| abstract |
To provide a piston ring capable of effectively preventing an aluminum adhesion phenomenon to the piston ring. In a piston ring comprising a piston ring body and a surface film formed on either the upper surface or the lower surface of the piston ring body, or both the upper surface and the lower surface of the piston ring, the surface film is heat resistant. It is comprised from resin and the powder which consists of a predetermined material contained in this heat resistant resin. [Selection] Figure 7 |