US Patent 8975792 Electric machine module cooling system and method

Embodiments of the invention provide an electric machine module. The module can include a housing, which can define a machine cavity. In some embodiments, a coolant jacket can be at least partially positioned within the housing. In some embodiments, a plurality of coolant apertures can be disposed through at least a portion of the housing to fluidly connect the coolant jacket and the machine cavity. The coolant apertures can include a first group configured and arranged to direct a first volume from the coolant jacket. The coolant apertures can include a second group configured and arranged to direct a second volume from the coolant jacket. In some embodiments, the first volume can be greater than the second volume.