| 摘要 |
PROBLEM TO BE SOLVED: To restrict the amount of displacement of a retainer to a rolling body to reduce friction at the time of collision or sliding contact, provide a moderate gap between a pocket surface and the rolling body to improve holding of lubricant, and suppress excitation of vibration of the retainer to prevent generation of retainer-noise. SOLUTION: A pocket surface 24 is formed of a first curved surface 24a which is positioned on the inner diameter end part 22a side of a pocket 22, which faces a inner ring, and a second curved surface 24b which is positioned on the outer diameter end part 22b side of the pocket, which faces an outer ring. These first and second curved surfaces are formed by making the values of the respective radiuses of curvature R1, R2 larger than the radius of curvature r0 of the rolling surface of a rolling body B, and by offsetting the respective centers of curvature O1, O2 in the radial direction D which passes through the center O0 of rotation of the rolling body to cross the axis of the retainer at right angle. Then, a lubricant sump 26 which circumferentially continues, is provided in the central part across the width of the pocket surface which is a boundary position between the first curved surface and the second curved surface.
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