| 摘要 |
Bearing bushings 13, which surround the protruding ends of an axle 9, are of frustro-conical construction at their inner ends 15 to engage associated frustro-conical recesses 14 in the joint head 5. The bearing bushings may be pushed into the recess in a play free fashion by tightening the nut 11 on the axle bolt 9. The bearing bushings may have radially resilient ends 15, by means of longitudinal slots, to surround the axle more tightly. The bushings may have longitudinal slots starting from both ends 15, 18 in order to have further radial resilience. The bushings may have a further frustro-conically widened section 19, which engages with a frustro-conical chamfer 17 in the through holes of the forked legs 6, leading to a radially raised annular collar 18 which is in contact with the bolt head or nut 10, 12. The bushings may also have a central annular groove 21 which defines a weakened longitudinal section which is collapsible under a predetermined axial load. |
