| 摘要 |
PROBLEM TO BE SOLVED: To provide a rolling bearing capable of preventing a reduction of torque and the occurrence of a flaw due to riding of a rolling element onto a groove shoulder and of materializing the prolongation of bearing service life by preventing early baking. SOLUTION: The roller bearing is provided with an inner ring 2 and an outer ring 4 arranged oppositely to each other so as to be relatively rotatable, a plurality of rolling elements 6 freely rollingly assembled between raceway track grooves 2s, 4s formed in opposite surfaces 2m, 4m of the inner/outer rings and a lubricant sealed in the inside of the bearing partitioned by the inner/outer rings. The radii 2R, 4R of curvature of raceway track grooves in the inner/outer rings are set to a range of 53% to 65% of a diameter 6d of the rolling element. The depths 2d, 4d of the raceway track grooves are set in a range between 10% and 15% of the diameter of the rolling element. In addition, a sealing quantity of a lubricant is set to a range of 25% to 50% in a space volume ratio of the inside of the bearing. In this case, the curvature of the raceway track groove in the outer ring is set bigger than that in the inner ring. COPYRIGHT: (C)2008,JPO&INPIT
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