| 摘要 |
It is aimed to increase the rigidity of an angular contact ball bearing of the type in which each ball contacts at least one of the raceways at two points, improve the lubricating environment of the balls, reduce the weight of the bearing while maintaining wear resistance and rigidity of the balls, reduce the weight of the bearing while maintaining wear resistance of the balls, improve the radial rigidity and axial rigidity of the bearing in a balanced manner, or to supply a sufficient amount of lubricating oil into an internal area between the two contact points between each ball and the raceway. A counter portion 7 is formed. With each ball 6 in contact with the raceway at two points, a gap is present between the portion of the bearing ring at the bearing centerline C and each ball 6. The balls 6 may be ceramic balls. A coating for improving wear resistance may be applied to the balls. The contact angle of the contact point close to the bearing center line is set at 15 to 25°, while the contact angle of the contact point remote from the centerline C is set at 40 to 50°.
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