| 摘要 |
1,061,411. Bearings; lubricating; screw-and-nut-gearing. GAMBIN S.A. April 20, 1964 [May 2, 1963], No. 16231/64. Headings F2A arid F2Q. A lead-screw mechanism for a machine tool comprises a rotatable screw 27 engaging with a pair of nuts 41, 42 which are provided with helical oil-grooves 55, 56 extending along the load-bearing flanks of their threads and terminating at a point remote from each end thereof, the grooves being filled with pressurized oil through pipes 57, 58, ducts 61, 62, annular grooves 63, 64 and further ducts 65, 66. The nut 41 is fixed to a support 29 by screws 43, whereas the nut 42 is provided with splines 46 which engage with further splines 47 on a ring 48 fixed - to the support by a plate 51 and screws 49 so that the two nuts can be pressed apart from each other by a spring 53 to minimize backlash. The spring is separated from the nut 42 by a ring 50 which is kept stationary by a pin 52. Leakage oil escapes from the mechanism through pipes 74, 75, 76. In a modification, Fig. 6 (not shown), the nuts are biased towards each other by a spring (53a) lodged in a cap or end piece (82) which is attached to the support (29). In a further modification, Fig. 4 (not shown), the screw (4) engages with a single nut (5) which may be provided with an oil groove (12) in one or both of the flanks of its thread. The screw may be stationary and the nut rotatable. |
