| 摘要 |
PROBLEM TO BE SOLVED: To prevent noise and rotation accuracy deterioration of a motor by improving impact resistance of a bearing. SOLUTION: In a ball bearing 20 having a number of balls B put between an outer ring 29 and an inner ring 28 along a circumference direction, a thickness (a) in a diameter direction of a part contacting balls B of the outer ring 29 is thinner than a thickness (b) in a diameter direction of a part contacting balls B of the inner ring 28.
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