| 摘要 |
The cross member for a universal joint has radially extending trunnions (14). The cylindrical bearing surfaces of the trunnions are grooved (32A) about their axes. The grooving serves to retain a supply of lubricant at the bearing surface despite the oscillatory movement of rolling bearing elements over the bearing surface. The grooving may be helical and may be randomly discontinuous. It may be achieved by a rough machining operation, optionally followed by roll burnishing. The bearing surface is then heat treated. |
