| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a radial ball bearing cage wherein lubricant can be sufficiently supplied between each ball and a concave portion of each pocket without increasing the filling amount of the lubricant, and to provide a radial ball bearing. <P>SOLUTION: The radial ball bearing cage 20 is annularly formed as a whole to rollingly hold a plurality of balls arranged between the raceway surfaces of the radial ball bearing, where pockets 18 are provided at a plurality of positions in the circumferential direction. The pockets have concave portions 19 for the balls 5 to be located thereon. Cavity portions 21, 22, 23 are provided in columnar portions 29 between the adjacent pockets, and communication holes 21a, 21b, 22b, 23a are provided for communicating the concave portions with the cavity portions. <P>COPYRIGHT: (C)2009,JPO&INPIT |
