| 摘要 |
PROBLEM TO BE SOLVED: To prevent the rolling trace by an edge from being concentrated on a predetermined range by axially displacing the rolling locus to a bearing ring of an edge of a rolling surface end part with respect to at least the predetermined number of rollers. SOLUTION: A rolling locus of an edge 6c in accompany with the rolling of at least one needle-shaped roller 6 is axially displaced. To obtain such the rolling locus, concretely, one or both edges 6c of the needle-shaped roller 6 are partially or totally displaced in the axial direction. According to this constitution, as the rolling locus of the axial upper and lower edges 6c does not repeatedly pass on the same place, the rolling trace by the upper and lower edges 6c is not deeply remained in comparison with the rolling trace by a rolling surface of the needle-shaped roller 6, and the abrasion can be reduced because the number of times of repeated rolling is reduced. As a result, an outer ring 2 can be prevented from being cracked and broken caused by the rolling trace by the upper and lower edges 6c.
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