| 摘要 |
<p>A ball bearing which is to function as a radial, radial angular-contact, and axial angular-contact bearing includes coaxial inner and outer races respectively formed with ball grooves which face each other, the bearing having a plurality of balls of a given ball radius situated between these races and extending into the grooves thereof so as to have rolling contact with the races. At least one of these races has in an axial plane which contains the common axis of the races a cross-sectional configuration according to which the innermost part of the groove of this one race has a radius of curvature which is somewhat greater than the radius of the ball, e.g., about 51.6% of the diameter of the ball, with the radius of curvature of the latter groove gradually increasing from the innermost part thereof up to a pair of opposed side edges of the groove. The continuous increase in this radius of curvature from the innermost part of the groove to the opposed side edges thereof is such that the radial clearance between the ball and the race groove is generally greater than what the radial clearance would be if the race curvature were that of a circle whose radius is substantially 51.6% of the diameter of the ball. Additionally, the continuous increase in the radius of curvature of the race groove is such that the difference between the radius of curvature of the innermost part of the groove and the ball radius and the difference between the radius of curvature at each of the side edges of the groove and the ball radius increases by at least a factor of 2.</p> |
