CAM follower

Abstract

There is provided a cam follower in which a surface roughness of an outer surface of a roller of a cam follower which is in rolling contact with a cam of an engine is obtained individually in an axial direction and a circumferential direction, a skewness Rsk of a profile is formed to be negative, a core roughness depth Rk is made to be 0.3 or less, a reduced valley depth Rvk is made to be 0.3 or less, and a ratio Rk/Rt of the Rk to a maximum height Rt of the profile is made to be 0.19 or more.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a vertical sectional view showing a state in which a cam follower with a roller according to the invention is in use.

FIG. 2 is a table showing the results of an evaluation of the invention and a conventional example in such a state that various parameters of surface roughness are set.

Claims

1. A cam follower comprising a roller which is in rolling contact with a cam of an engine, wherein a surface roughness of an outer surface of the roller, which is obtained respectively in an axial direction and circumferential direction satisfies the following inequalities: a skewness Rsk of a profile of the surface roughness<0,a core roughness depth Rk≦0.3;a reduced valley depth Rvk≦0.3; anda ratio Rk/Rt of the Rk to a maximum height Rt of the profile≧0.19.

2. The cam follower according to claim 1, wherein the roller is made to have a hardness of Rockwell C 58 or more, and wherein the kurtosis Rku of the profile of the surface roughness of the outer surface of the roller is made to be 8 or less.

3. The cam follower according to claim 1, wherein a reduced peak height Rpk of the surface roughness of the outer surface of the roller is made to be 0.08 or less.