Patent ID: 7737585

Claim:
An electrical machine, comprising: a housing made of two housing parts nested within one another to form a cooling jacket for flow of a coolant, each said housing part being constructed to form a bearing housing portion; a stator formed of stacked laminations and received in the housing; a rotor having a shaft; and a bearing unit rotatably supporting the shaft and having a first bearing seated in the bearing housing portion of one of the housing parts and a second bearing in spaced-apart relationship to the first bearing and seated in the bearing housing portion of the other one of the housing parts; wherein the cooling jacket includes axial cooling channels separated by pins which are sized to form deflections at respective ends of the cooling channels to thereby establish a coolant flow along a meandering path around the stator, wherein one of the housing parts is disposed in confronting relationship to the stacked laminations of the stator and has a conical inner side which tapers outwards to define a cavity between the one housing part and the stacked laminations of the stator for receiving a thermally conducting material to maintain sufficient thermal conductivity between the housing and the stator.