| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a long-life ball bearing in which a retention property of grease inside a pocket is enhanced, and the pocket of a retainer and a sliding contact part with balls are reliably lubricated, and to provide a motor and a spindle device using the ball bearing. <P>SOLUTION: An angular ball bearing 10 includes an outer ring 11, an inner ring 12, a plurality of balls 13 arranged between the outer ring 11 and the outer ring 12, and a retainer 14 having a plurality of pockets 15 each holding a plurality of balls 13. The pocket 15 of the retainer 14 has an inner surface 15a formed by a cylindrical surface, and the inner surface 15a formed by the cylindrical surface is formed with a recess groove 24 in a noncontact area 18 out of contact with the ball 13. <P>COPYRIGHT: (C)2013,JPO&INPIT |
