| 摘要 |
1,188,355. Universal joints. NADELLA S.A., and A. PITNER. 27 April, 1967 [28 April, 1966; 21 Sept., 1966], No. 19342/67. Heading F2U. In a Hookes type universal joint accurate alignment of a spider and yoke is obtained during assembly by aligning the spider C and yoke M, spreading apart or urging together the yoke arm 5 with a predetermined force, then fixing needle bearing cups 1 in the bores of the yoke arms with a predetermined force so that on release of the arms the bearing cups exert a predetermined thrust on the ends of the spider arms. Means are provided for preventing the forces applied in fixing the bearing cups in the bores from acting on the yoke arms before their release and thus altering the thrust subsequently exerted by the cups. As shown the yoke and spider are aligned by a collar 3 having a bore receiving a stem of the yoke and faces 4a, 46 positioning the spider. The arms 5 are spread by blocks 11, 111 slidable on a guide rod 14. The blocks have projections 11a, 111a fast therewith and members 23, 123 pivoted thereon and co-operating with cams 28, 128 to clamp the yoke arms. As shown the blocks are shifted to spread the arms by a screw 15 adjusted by a dynamometric wrench to exert a predetermined thrust on the arms. In other embodiments the blocks are adjusted hydraulically. The blocks are then temporarily locked to the guide rod 14 by friction brake pads 32 applied by pistons 34 in cylinders 35, 135 formed in the blocks, and then a wedge 13 is shifted to take up the space between the blocks. The friction locking means prevents the wedge from altering the position of the blocks. The locking means can now be released. The bearing cups are now secured in their respective bores in the yoke arms by securing elements 2 which are acted upon by pistons 22, 122 in cylinders 21, 121, the wedge 13 preventing any movement of the arms during this operation. In a modification the cylinders 21, 121 are provided in the blocks 11, 111, and in this case wedges are provided between the blocks and a support to prevent outward movement of the blocks while the securing elements are being fixed in the bores. Specifications 1,177,253, 1,079,602, 909,624 and 901,854 are referred to. |
