Rolling bearing, cam-follower with roller, and cam
AssigneeNtn Corporation
InventorsKenichi Ichikawa, Yasuyuki Watanabe
Life of this patent
Estimating the term…
Abstract
A rolling bearing that attains long life against surface damage such as surface-originating separation or internally originating separation and allows caulking of its shaft end face, a cam-follower with roller employing the rolling bearing, and a cam are obtained. The rolling bearing includes an outer-roller, a roller shaft located inside the outer-roller, and a rolling element interposed between the outer-roller and the roller shaft. At least one member of the outer-roller and the roller shaft has a nitrogen enriched layer. A surface portion of an area in a rolling contact surface where the rolling element rolls has austenite grain size of No. 11 or larger. The end portion has hardness of not larger than HV300.
Claims14
A rolling bearing, comprising:
- an outer member;
- an inner member located inside said outer member;
- and
- a rolling element interposed between said outer member and said inner member;
- wherein
- at least one member of said outer member and said inner member has a nitrogen enriched layer,
- in said at least one member, austenite grain size of a surface portion of an area in a rolling contact surface where said rolling element rolls is at least No. 11,
- said surface portion of the area in said rolling contact surface includes 15 to 35 volume % of retained austenite,
- a microstructure of an area other than the surface portion of the area in said rolling contact surface contains ferrite and carbide;
- and
- an end portion of that member has hardness of at most HV (Vickers hardness) 300.
Dependencies are inferred from the claim text.