Rolling/sliding part

Machine element or mechanism – Elements – Cams

Patent

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Details

74559, 384912, F16H 5306

Patent

active

056112505

ABSTRACT:
The rolling/sliding outer ring of the cam follower apparatus is made to withstand peeling very well, even in severe lubrication conditions, by forming a surface layer in the depth 0 to 50 .mu.m from the outer peripheral surface of the outer ring, such that the maximum residual compressive stress in this surface layer is between 50 and 110 kgf/mm.sup.2, the hardness of this surface layer is between Hv 830 and Hv 960, and the amount of residual austenite in the surface layer is at least 7 volume %, and formed with continuous minute irregularities on the surface with convexities of the irregularities having an equivalent roundness diameter up to 15 .mu.m for the case that the concavities of the irregularities are assumed to occupy 80% of the total surface area, while the inner peripheral surface of the outer ring is superfinished.

REFERENCES:
patent: 4659241 (1987-04-01), Bamberger et al.
patent: 5019182 (1991-05-01), Arimi
patent: 5054440 (1991-10-01), Kadokawa
patent: 5152851 (1992-10-01), Yamamoto et al.
patent: 5325747 (1994-07-01), Santhanam et al.
patent: 5361648 (1994-11-01), Murakami et al.
Automotive Engineering (Japan), "Roller Rocker Arm and the Reduction of Friction", Jul. 1989.

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