H - Electricity – 02 – K
Patent
H - Electricity
02
K
26/177, 184/20
H02K 5/16 (2006.01)
Patent
CA 1083500
Abstract of the Disclosure An illustrated lubrication arrangement substantially prevents end leakage oil from flowing along the shaft to an oil thrower, and also causes end leakage oil to recirculate through wicking material to a feed wick which in turn feeds oil to a bearing clearance. A feed wick includes a feeding portion that extends through a window in the bearing and contacts the shaft. This same wick includes recirculatory pick-up wicks that protrude into a capillary oil collection region at each end of the bear- ing. The pick-up wicks have a smaller cumulative effective axial length than the feeding tab of the wick. The pick-up wicks also contact the shaft, and they recirculate end leakage oil to the feeding tab because of gradients in oil content within the wick- ing that interconnects the pick-up wicks with the feeding tab. The pick-up wicks and feeding tab may actually be separate pieces, the capillary interstices of which communicate with each other. The inner diameter ends of the bearing are chamfered according to prior practice to provide a capillary space that tends to circulate oil from the pressure side of the bearing to the unloaded side of the bearing. By using the invention, filling up of the circumferentially extending capillary and ultimate creepage of end leakage oil is substantially reduced or eliminated because notches or windows at the ends of the bearings accommodate the pick-up wicks, the capillary action of which recirculates oil to the feeding tab. Localized oil depletion causes oil to flow from the pick-up tabs to the more depleted region of the feed wick. This depletion ensures that the feed wick will pick up the end leakage oil and recirculate it to the bearing. In some applications, I can provide shield or barrier means that inhibit the supply of oil directly to the feed wick from an oil reservoir. This can further ensure that oil supplied to the feed wick will be supplied from the wicking associated with the pick-up tabs. The feed wick may be positioned within a bearing cavity so that it is pushed toward the shaft by its ends, and the material from which the feed wick is made will act as a beam which limits the amount of pressure between the shaft, feed wick, and pick-up tabs. Moreover, the wick structure preferably is sway-backed to facilitate assembly of the wick in the bearing lubrication cavity, and to establish a re-oiling cavity. In the practice of one preferred method, a feed wick combined with two pick-up tabs is moved axially along the out- side of a bearing holder, tilted in a first direction as a first pick-up tab crosses a feed window, tilted in the opposite direction just after the feed wick moves past a first bearing end notch, and then further moved in an axial direction while a leading end of the combined wick is cammed into a final position by part of the bearing housing of a motor end shield.
282829
Company General Electric
Eckersley Raymond A.
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