| 摘要 |
PROBLEM TO BE SOLVED: To prevent the occurrence of leakage of grease when the grease is used for a high-speed rotation in a sealed radial ball bearing having a crown- shaped holder and a seal. SOLUTION: The distance between a ball 3 extruded from the end face of a claw 41 of a crown-shaped holder 4 and the internal surface of a seal 5 opposing to the ball, and along the center line L in the direction of the diameter of a bearing of the ball, is set as A. The distance between the end face at a bottom side 42 of the crown-shaped holder 4 and the internal surface of the seal 5 opposing to the end face, and along the line L, is set as B. The ratio of the two in above (A/B) is made to be not less than 0.4 and not more than 2.0.
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