Liquid cooled collector rings for dynamoelectric machine

Claim 1

In a dynamoelectric machine of the type having insulated collector rings attached to the shaft and electrically connected to leads within the shaft, the improvement comprising: an axially extending overhanging collector ring portion having an outer surface adapted for rubbing contact with brushes, a ring detachably secured to said overhanging portion and extending radially inward therefrom to provide a liquid dam, said overhanging ring portion and said dam defining a rotating chamber, a cylindrical sleeve surrounding said shaft and extending axially between the dam and the shaft into said chamber and defining a plurality of axial liquid supply and discharge passages, a liquid discharge ring disposed on the sleeve, a liquid pickup ring axially spaced from the discharge ring and disposed on the sleeve, said discharge and pickup rings defining a plurality of circumferentially spaced curved passageways respectively, curved in opposite directions to facilitate discharge and pickup of liquid from said chamber, the curved passages of the respective rings being arranged to communicate with alternating axial passages in the sleeve, and manifold means comprising a pair of annular chambers surrounding the sleeve and arranged to supply cooling liquid to one set of axial passages and to receive liquid from another set of axial passages.