| 摘要 |
1,013,041. Machine tool details. COUNCIL FOR SCIENTIFIC AND INTERNATIONAL RESEARCH. April 19, 1963 [May 7, 1962], No. 17393/62. Headings B3B and B3T. [Also in Division F1 An hydraulic swash-plate motor, e.g. for a machine tool drive, has its output shaft 2, Fig. 1, mounted without axial float in bearings 3, 4 in a fixed frame 1, and its port block 10 and tiltable swash-plate 9 united by a yoke or cage 14, Fig. 2, supported on shaft 2 by a bearing 11, and prevented from rotating by an arm 15 engaging frame 1 through abutment means, which act to balance the torque reaction and permit axial float of the yoke relative to the cylinder block 8. In the Fig. 3 embodiment, the abutment means engaging arm 15 comprise opposed pistons 18, 19 of different diameters subjected to the motor inlet pressure via passages 32, 27 and 26 and check valves 30, 31. The differential thrust due to pistons 18, 19 is proportional to the torque due to the cutting load at the tool 33, and hence to the torque reaction at arm 15. Needle valves 28, 29 in passages 26 act to damp oscillations of arm 15. Fluctuations of torque reaction are balanced by piston springs 22, 23 adjustable by screws 24, 25. In other embodiments, arm 15 engages frame 1 through a rubber block or bushing. Shaft 2 may be in two parts spigoted and keyed together, with one part integral with cylinder block 8. Specification 893,848 is referred to. |
