| 摘要 |
PROBLEM TO BE SOLVED: To prevent adsorption of a ball to a ball contacting face of a pocket inner face of a resin cage. SOLUTION: By making the surface roughness of a guiding face 5a where the ball 3 contacts, of the inner face of the pocket 5 of the cage 4 for holding the ball 3 to between Ra 6 and 10μm, a lubricating oil A is held in a recessed part 5b of the guiding face 5a, and a sufficient oil film is formed. Thereby, adsorption of the ball 3 at the guiding face 5a can be prevented. COPYRIGHT: (C)2007,JPO&INPIT
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