US Patent 7965002 Helical conduit enabled for casting inside a housing

The present disclosure is directed to a fluid-cooled housing for an electric device having an outer surface and an inner surface, the inner surface defining, at least in part, a housing cavity having a longitudinal axis, an end wall continuous with the inner surface. The inner surface having a plurality of core print openings along the longitudinal axis, and a helical conduit integrated within the housing between the outer and inner surfaces along the axis formed from a helical coil core having two or more laterally extending tabs which form the core print in two or more planes.