| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a synthetic-resin-made retainer hardly causing shrinkage or deformation even if thick-walled. SOLUTION: Slit like holes S; for forming the insides of column parts 12 toward a tip from the bottom surface 14 of respective column parts 12 between ball receiving parts 11, for receiving the steel balls in a synthetic-resin-made holder 10 provided between the outer and inner races of a ball bearing; are formed so that the mass of the column parts 12 can be nearly equivalent in inside and outside a center line, with the center line, of the ring-like bottom surface 14 of the base parts 12a of the column parts 12a, as a boundary.</p> |
