Patent ID: 6909210

Claim:
A cooling jacket for cooling a stator of a dynamoelectric machine, the jacket comprising: an annular inner shell having a generally cylindric inner surface defining a cavity for receiving said stator so that the stator is in heat transfer contact with said inner surface, the inner shell having a central longitudinal axis and an outer surface; an annular outer shell for nesting coaxial alignment with the inner shell to define an annular gap between the inner and outer shells; and a plurality of fins formed on the outer surface of the inner shell and projecting radially outward from the outer surface into the annular gap between the inner and outer shells, said fins defining at least one flow path for conveying a fluid through the cooling jacket; wherein at least one of the fins is positioned on the inner shell to extend in a direction circumferentially on the inner shell and substantially normal to the longitudinal axis so that the fluid flow path is directed generally circumferentially of the cooling jacket.