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 which comprises a roller ring (11), a shaft (12), and rollers (13). At least one of the roller ring (11), shaft (12), and rollers (13) is a steel member constituted of a steel which contains 0.7-2.4% carbon and 10.0-20.0% chromium, with the remainder being iron and impurities. In the rolling surface of the steel member (roller-ring rolling surface (11A), shaft rolling surface (12A), and roller rolling surface (13A)), grains of a carbide comprising carbon and at least either iron or chromium and having an area of 12.6 µm2 or larger have generated in an areal proportion of 5.0% or higher.