| 摘要 |
A radial inner end (48b) of a retainer (48) is spaced radially outwardly from a radial outer end (T) of a sliding-contact region (S), and with this construction the axial movement of each needle roller (52) is limited not by the retainer but by an inner ring (36b,37b), and a restriction flange (40). Therefore, a large axial force developing in the needle rollers is received by the inner ring and the restriction flange, and as a result, the retainer having low rigidity can be satisfactorily used. Therefore, any suitable material such as a synthetic resin can be selected for the retainer, and besides the wall thickness of the retainer can be made small. |
