| 摘要 |
1,146,901. Making gears; bending. LEAR SIEGLER Inc. 30 March, 1966 [21 June, 1965(2)], No. 14101/66. Headings B3A and B3E. Ovality of an annular member, such as an internal gear G, is corrected by applying radially directed outward or inward forces to the member so as to stress it beyond its elastic limit, producing relative rotation between the points at which the forces are applied and the member, and then reducing the radial forces whilst maintaining the relative rotation. Outwardly directed forces are applied by a pair of pinions 20, 22 journalled on shafts 26, 44 which are supported by pairs of arms 32, 48, Fig. 5, which can be driven apart by a cam 52 on a shaft 54, Fig. 3, which is rotated by fluid pressure means acting on an arm 62 to force the pinions into contact with the gear G deforming it outwards. The pinions 20, 22 are then driven by a pinion 24, causing the gear G to rotate and after it has completed at least one complete revolution the force exerted by the cam is gradually reduced. After this treatment the ovality of the gear is reduced and the gear teeth are burnished. Additional inward radial force may be applied by a pair of rollers 108 which are mounted on a yoke 96, Fig. 8, and are a predetermined fixed distance apart such that when the yoke is pushed over the gear G by a screw 88 or by fluid pressure operated means the gear is deformed inward. Gradual reduction of the inward force is produced by withdrawing the yoke 96 from the gear G. |
