| 摘要 |
PROBLEM TO BE SOLVED: To provide a ball bearing preventing seizure by reducing heat generation in accompany with high-speed rotation, elongating the rolling fatigue life, and reducing the cost. SOLUTION: A curvature radius of a cross section in the width direction of an inner raceway groove 15 is set to 0.535Da-0.545Da with respect to a diameter Da of a ball 13, a curvature radius of a cross section in the width direction of an outer raceway groove 15 is set to 0.515Da-0.545Da with respect to the diameter Da of the ball 13, a contact angle of the ball 13 to the inner raceway groove 15 and the outer raceway groove 16 is set to 17°-26°, and the diameter of the ball 13 is set to 0.4H-0.56H with respect to a bearing cross-sectional height H (1/2 of value obtained by subtracting inner diameter of inner ring 11 from outer diameter of outer ring 12). COPYRIGHT: (C)2004,JPO
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