PISTON RING FOR INTERNAL COMBUSTION ENGINE

摘要

[PROBLEMS] To provide a piston ring for an internal combustion engine capable of maintaining a low friction even in a tapered cylinder by suppressing the occurrence of frictional force by the opening/closing of the piston ring. [MEANS FOR SOLVING PROBLEMS] This piston ring (10) is characterized in that chamfers (22) having a circumferential width L1 larger than a radial width L2 are formed at edge parts (20) between abutment end faces (16) and an outer peripheral surface (18). Thus, since the formation of an oil film is promoted, the frictional force in the circumferential direction caused by the opening/closing motion of an abutment can be reduced.