| 摘要 |
A spherical inner surface of the outer race and track grooves in the outer race are each defined by a post-hardening cut surface. A spherical outer surface of the inner race and track grooves in the inner race are also each defined by a post-hardening cut surface. A retainer has a spherical outer surface, a spherical inner surface and inner surfaces of the pockets, all of which are defined by a post-hardening cut surface. Respective surfaces of the retainer, the outer race and the inner race which contact with each other are formed with a surface treatment layer for reducing a frictional resistance.
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