| 摘要 |
PURPOSE:To efficiently perform assembly work, by making ball retainer from an elastic and plastic material or the like and preventing balls from dropping off after they are pushed into retaining parts. CONSTITUTION:A ball retainer 17 is made from an elastic material. Lips 173, 174 are provided on openings. When steel balls 12 are lightly pushed into ball retaining parts 171, the lips 173, 174 are expanded. This results in enabling sub-assembly. The outside diameter of grease storage grooves 172 is made larger than that of the steel balls 12. Grease can be supplied into the grooves simultaneously with the pushing-in of the steel balls 12. |
