Patent GB-745213-A (GB)
Title: Improvements in or relating to lubricating arrangements for rotating parts
Inventor: SUTTON PETER
IPC: F16N25/00
Filed: 1953-02-06
Abstract: 745,213. Lubricating and cooling bearings. ROLLS-ROYCE, Ltd. Jan. 27, 1954 [Feb. 6, 1953], No. 3490/53. Classes 12 (1) and 12 (3). A lubricating arrangement for a rotating part supported in bearings in a stationary structure comprises an axial bore in the part with webs extending inwards from the wall of the bore part way only to the axis of the bore to form lengthwise channels, means to deliver a metered quantity of lubricant (which may include cooling water) to the bore to be distributed in the channels, and outlet means to convey the lubricant away from each of a plurality of the channels as separate streams to a corresponding number of bearings. In the construction shown in Figs. 1 and 2, a hollow rotating part 10 is mounted in bearings 12, 13, 14 in a stationary structure 11. Oil feed fittings 15, 16, 17 interconnected by conduits 18, 19 are coaxial with the part 10. The fitting 15 has a central bore with the walls thereof provided with inwardly projecting webs 20 dividing the fitting into three channels 21. At one end of the channels is a plug 23 which has a splined hole engaged by a splined end of a shaft 25. The shaft 25 at the other end passes through an oil feed nozzle 28 and is connected to a shaft 26 so that the latter can be driven from the rotating part 10. Oil is fed to the nozzle 28 through ducts 29 into the channels 21, oil from one channel passing through passage 30 to the bearing 12. Oil from the other two channels 21 passes through two ports 31 in the plug 23 to enter a pair of ducts 32 formed in conduit 18 by a transverse wall 33. From one of these ducts, which is closed at one end by a segmental plate 34, oil is passed through drillings 35 to the bearing 13. Oil fed to the other duct 32 passes through drillings 36 to the bearing 14. In a modification shown in section in Fig. 8, the rotating part 40 is supported in four bearings and is formed internally with inwardly-projecting webs 45 which extend substantially over the whole length of the part 40 to form channels 46. Each channel has an opening 49 leading to a bearing. Figs. 9 and 10 show an arrangement for lubricating the bearings of the rotor assembly of a gas-turbine engine. The compressor rotor 53 has at one end a stub shaft 54 and is mounted in bearings 55, 56. The shaft 54 is connected by splines to the shaft 58 of the turbine rotor 57, which is supported in a bearing 60. A tube 61 extends through the rotor assembly, the tube having three channels 62, 63, 64 separated by webs 65. Within the tube at one end is fitted a shaft 25 provided with splines 93 which cooperate with the webs 65 whereby the shaft 25 may be driven by the tube 61. From eachof the channels a bore leads outwardly to convey lubricating oil to one of the bearings. The oil is supplied to the pipe 61 by means of an annular nozzle 90 having orifices 91 the issuing jets impinging on a radial flange 92 on the shaft 25. The oil may be supplied from a tank under pressure produced by an air pump, a relief valve being provided to maintain the pressure constant.