| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a roller follower and a valve gear device having sufficiently improved durability. <P>SOLUTION: The 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 constituted of a steel composed of 0.7-2.4% carbon, 10.0-20.0% chromium and the balance iron with impurities. In the rolling surface of the steel member (roller-ring surface 11A, shaft rolling surface 12A and roller rolling surface 13A), carbide having an area of ≥12.6 μm<SP>2</SP>, containing at least either of iron or chromium and carbon, is generated in an areal proportion of ≥5.0%. <P>COPYRIGHT: (C)2010,JPO&INPIT |
