| 摘要 |
Cam follower includes a cantilevered stud, and a bearing unit mounted on a head portion of the stud and having rollers and an outer ring. The outer peripheral surface of the outer ring constitutes a cam-driven surface. The cam-driven surface includes a central load-bearing region substantially parallel to the axis of the cantilevered stud, and a couple of non-load-bearing regions indented radially inward from the central load-bearing region and located on opposite sides of the central load-bearing region axially symmetrically to each other. Mechanical stress acting on the inner surface of the outer ring, outer surface of the roller and outer surface of the stud's head portion presents a maximum intensity level at their respective points corresponding to a point of the outer ring which is subjected to maximum mechanical contact stress from a cam. However, by the provision of the non-load-bearing regions, the stress on the inner surface of the outer ring, outer surface of the roller and outer surface of the stud's head portion can be made smaller than that applied from the cam to the cam-driven surface, and the stress acting on the roller can be effectively leveled off.
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