| 摘要 |
PURPOSE:To prevent galling from occurring when a bearing is press-fitted by applying tumbler machining to an outer ring bored with a strut inserting hole to corner-slouch around the hole before heat treatment then applying heat treatment and tumbler machining. CONSTITUTION:A needle-shaped roller bearing 4 is constituted of an outer ring 12, a needle-shaped roller 13 and a holder 14, and a hole 15 is bored on the outer ring 12. The outer ring 12 is produced by boring the hole 15 on a raw material, next applying tumbler machining to corner-slouch around the hole 15, then applying tumbler machining again for heat treatment and scale removal. Therefore, the periphery of the hole 15 is chamfered 19 in a circular shape, and no burr is protruded on the outside of the outer ring 12. Accordingly, galling can be prevented from occurring when the needle-shaped roller bearing 4 is press-fitted into the coupling hole of a caliper without applying positive chamfering around the hole 15 by press machining. |
