Nippon Piston Ring Co., Ltd.

Michihiro Ito

Atsushi Chiba

Makoto Kajiwara

Iwao Hiraishi

Naoyuki Akimoto

Provided is a piston ring such that it is possible to sufficiently inhibit adhesive wear when the piston ring is mounted to a piston for a diesel engine in which at least the piston ring groove in the piston is formed from steel or cast iron. Disclosed is a piston ring mounted to a piston for a diesel engine, wherein the load length ratio (Rmr2) (in accordance with JIS B0601:2001) of the top surface and bottom surface of the piston ring satisfies each of the following conditions: Rmr2 (0.5%, 0.3[mu]m)=20% and Rmr2 (0.5%, 0.4[mu]m)=40%.

Growing community of inventors

Saitama, Japan

Michihiro Ito