| 摘要 |
PROBLEM TO BE SOLVED: To improve seisure resistance of the contact part between the axial end face of each roller 5a and the inner side face 11a, 11a of respective outward and inward collars 8a, 10a and improve the axial load capacity of the contact part. SOLUTION: The engaging part with the inside face 11a, 11a of respective outward and inward collars 8a, 10a in the axial both end faces of the rollers 5a is formed in a spherical protrusive face existing on the same spherical face of a radius r5a , having the same center with the center O5a of the roller 5a. And further, the inside faces 11a, 11a of the outward and inward collars 8a, 10a are formed in recessive curved faces which include the center O5a of the curvature of the spherical protrusive face and have the center O11a of curvature on a virtual plane Y perpendicularly crossing with the central axis X of each roller 5a, the radius r11a of curvature is substantially the same radius with the radius r5a of cuverture of the spherical protrusive face. As a result, since the contact state of the contact part becomes close to a point contact or line contact, and a rolling contact, the above subject can be solved.
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