| 摘要 |
699,410. Screw-and-nut gearing. STRANDGREN, C. B. June 23, 1950 [July 13, 1949], No. 15752/50. Class 80 (iii). [Also in Group XXXIV] In a roller bearing arrangement for a nut and screw device of the kind in which a plurality of threaded rollers 8 are disposed between and engage the threads of the nut 1 and screw 6, the threads of the rollers have the same spiral angle as the threads of one of the relatively rotatable members, and a different spiral angle from the threads of the other member. The common spiral angle may be 90 degrees. Sliding action between the rollers and member having threads of the same spiral angle is prevented by providing the ends of the rollers with toothed rims 10 which mesh straight teeth 11 on the said member. The nut member may be in two parts 1, 1a, Fig. 7, keyed together by longitudinal keys 16 and urged axially towards one another by means of a flanged sleeve 18 and a screwed ring 20 so that play between the threads may be avoided. The numbers of threads of the nut and screw portions are different, each roller has only one thread, and the number of rollers is at least equal to the difference between the number of threads of the nut and of the screw, the number of threads of the nut being at least three. Suitable thread profiles are described. |
