| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce torque by reducing stirring resistance of lubricant during its rotation. <P>SOLUTION: In a retainer where semispherical pockets 12 for storing balls are formed at a plurality of circumferential portions of the opposing surfaces 11 of the two annular bodies 10, and the two annular bodies 10 are joined together while the opposing surfaces 11 are made to abut against each other, a joined part, where the two annular bodies 10 are joined together while the opposing surfaces 11 are made to abut against each other, is circumferentially provided at both ends of the pockets 12, and back surfaces 17 located at the opposite side to the opposing surfaces 11 are wholly circumferentially flattened. <P>COPYRIGHT: (C)2013,JPO&INPIT |
