GB885899A - Improvements in bearings for tapered shafts - Google Patents

Abstract

885,899. Bearings. TIMKEN ROLLER BEARING CO. Dec. 29, 1959, No. 44079/59. Class 12 (1). [Also in Group XXII] A bearing assembly for a tapered shaft 10, Fig. 1, having inner races 24, 30, 34 with tapered bores which are an interference fit on the shaft, comprises means for supplying fluid under pressure to the joint faces to release the bearings from the shaft, and co-operating means on the shaft and the bearing housing 40 to limit axial displacement of the housing due to this pressure and prevents damage to the bearings. The bearing assembly 21, Fig. 1, comprises three inner races supporting rollers 22, 26, 28, 32 and two outer races 36, 38, in the housing 40. The bores of the inner races are tapered and are an interference fit on the shaft 10, and adjacent each inner race is a groove 74, 76, 78 communicating with axial passages in the shaft through which fluid under pressure is supplied to break the interference fit to allow the bearings to be disassembled. To assemble the bearings a bearing ring 48 is placed at the end 44 of the shaft, the housing 40, along with the bearings, is moved towards the ring, and a pressure ring 62 is loosely located on the shaft by a block 66 secured to the housing 40. A thrust member 18 is secured in a groove 16 in the shaft and pressure is applied between the members 18, 62 by e.g. an hydraulic jack, and the inner races are seated tightly on the shaft and against bearing ring 48. The member 18 is removed and a ring 20 is placed on the portion 14 of the shaft to receive an internally screwed ring 64. The member 18 is replaced and the ring 64 is rotated on ring 20 until the members 62, 64, 20 and 18 are jammed tight, and a screw 65 locks the members 64, 62. To disassemble the bearings the members 18, 20 and 64 are removed and fluid pressure is supplied to the groove 78, the axial force of such pressure moving the race 34 to the left and the movement is limited by a flange on the member 62 engaging the block 66. Pressure fluid is then supplied to the groove 76 thus moving the race 30 along with the housing 40 to the left, the movement being limited by a flange 60 on the housing engaging the race 24. Finally, pressure fluid is supplied to the groove 74 and the race 24 moves to the left thus enabling the bearing assembly to be removed from the shaft. The bearings are sealed by seals 52, 70. In a modification, Fig. 2, the bearing ring 48 is replaced by an extension 90 of the inner race 24, and the flange 60 is replaced by a flange 104 on a ring 92 which engages adjustable plates 98, secured to the block 94, after the ring is adjusted axially on the ring 20 to the required position. The seal 108, Fig. 2, may be replaced by a seal engaging the end 25 of the shaft.