ROLLER FOLLOWER, VALVE GEAR, APPARATUS FOR HIGH-FREQUENCY HARDENING, METHOD OF HEAT-TREATING SHAFT MEMBER, PROCESS FOR PRODUCING SHAFT, AND SHAFT

摘要

A roller follower includes a roller ring (11), a shaft (12) and a plurality of rollers (13). At least one of the roller ring (11), the shaft (12) and the rollers (13) is a steel member made of steel containing 0.7 to 2.4 % carbon and 10.0 to 20.0% chromium, with remainder iron and impurities. In addition, carbide containing at least any one of iron and chromium as well as carbon and having an area of 12.6 µm 2 or greater is generated at an area ratio of 5.0 % or higher, a.t a rolling contact surface of the steel member (a roller ring rolling contact surface (11A), a shaft rolling contact surface (12A) and a roller rolling contact surface (13A)).