| 摘要 |
1,105,511. Screw and nut gearing. ROTAX Ltd. 21 July, 1965 [20 Aug., 1964], No. 34035/64. Heading F2Q. A nut 11 is mounted directly on a screw 2 with limited axial and rotative freedom adjacent a recirculating ball-nut 5 engaging through balls 6 the thread 3 of the screw 2, so that during relative rotation of the screw and nut in one direction, e.g. to move an axial screw load A, the nut 11 is frictionally dragged angularly and axially out of engagement with a rollerrace 13 between itself and a stationary ball-nut housing 4, whereby the ball-nut alone supports the load, but during rotation in the opposite direction, e.g. due to a static axial load on the screw, the nut 11 is frictionally dragged angularly and axially against the race 13 so that the nut 11 now supports the whole or part of the load. The nut 11 is angularly biased by a spring (19) acting on a radial pin 16 into engagement with the race 13 and the angular bias is limited by the pin 16 engaging a nut housing stop 17. The nut 11 is axially free in a housing 10 which retains the ball-nut 5 for limited axial movement only. The roller bearing 13 prevents the nut 11 sticking when the screw and nut are relatively rotated to move an axial load. |
