Patent GB-576112-A (GB)
Title: Improvements in or relating to planetary drives, particularly for winches
IPC: B66D1/22
Filed: 1942-12-31
Abstract: 576,112. Epicyclic toothed gearing RUSTON-BUCYRUS, Ltd. Dec. 31, 1942, No. 18594. Convention date, March 13. [Class 80 (i)] [Also in Group XXX] Driving gear for a winch drum 11 or 12, Figs. 2 and 5, comprises an epicyclic gear train having a rotatable member, such as the toothed annulus 62, mounted on a pair of concentric substantially coplanar conical bearings 66, 64 having their cones converging in the same direction, the outer bearing 66 supporting the member 62 on the driven member or planet carrier 11 (or 12), and the inner bearing 64 supporting the member 62 on the driving shaft 57. According to another feature of the invention, a third bearing 68 is provided between the driving and driven members 57, 11 (or 12) and all those bearings are simultaneously tightened by a nut 72 on the driving shaft acting in conjunction with a collar 78 also on the driving shaft. In the construction shown, the power take-off shaft 52 of a tractor is coupled at 53 to a shaft 54 driving a transverse shaft 57 mounted in bearings 71 in a casing 25. Each end of the shaft 57 carries a winch drum 11 or 12 which it drives through an epicyclic gear train controlled by brake bands 13, 14 or 15, 16. Each gear train comprises a driving sun-pinion 58 on the shaft 57, planet pinions 59 rotating on pins 60 on the winch drum, and a toothed annulus 62 fixed to a brake drum 63, the arrangement being such that when the brake 13 is applied, the drum 63 and annulus 62 are held stationary and the drive is transmitted from the shaft 57 to the winch drive through the epicyclic gear. The brake 14 acts on a drum 61 on the winch drum and is applied by the same hand lever 46 as the brake 13. The brakes 15, 16 for the winch 12 are similarly controlled by a hand lever 48 and link 49. The hand lever 46 has a vertical cylinder 45 which is mounted on a vertical pivot and is formed with a lower cam surface 37, Fig. 6, controlling the brake 13 by means of a lever 33, and an upper cam surface 42 controlling the brake 14 by means of a lever 40. The lever 33 has a roller 36 engaging the cam 37 and acts on the brake 13 by means of a short rod 31, the brake being released by a spring 32. The lever 40 has a roller 41 engaging the cam 42 and acts on the brake 14 by means of a longer rod 38 provided with a releasing spring 43. Normally, the brake 14 is applied by a strong spring 44 acting in opposition to the releasing spring. When the hand lever 46 is moved in one direction from the neutral position shown in Figs. 1 and 6 in which the driving brake 13 is released and the holding brake 14 is applied to hold the winch 11 stationary, the cam 3 depresses the roller 3 and applies the brake 13 to transmit the drive through the epicyclic gear to the winch. At the same time the roller 41 rides up on the cam 42 and rolls the lever 40 to release the holding brake 14. If the hand lever 46 is rotated in the opposite direction from the neutral position, the roller 36 rides on the flat part of cam 37 and the driving brake 13 remains "off" ; the roller 41 rides up another part of the cam 42 and releases the holding brake 14, a notch 51 being provided in which the roller 41 can rest so that the brake remains ''off" when the hand lever is released. The brake drum 13 forms a cover 65 for the epicyclic gearing. The rope 17 or the winch 11 passes over a fairlead 18, and under a swivelling fair lead 19 to the work (not shown). The rope 20 on the drum 12 similarly passes over and under fairleads 21 22.