Abstract: An electrodynamic machine, such as an electric induction motor (10), has a frame (12); at least one bearing housing (16) attached to the frame, including a bearing (18); and a shaft (14) rotatively mounted to the bearing within the frame. A second housing, such as a fan housing (20), defines at least one generally tapered, mating shoulder surface (24). The second housing is attached to the bearing housing along a fixed reference plane with respect to the shaft centerline. The device has at least one fastener (26, 28) defining a generally tapered shoulder surface (40), which abuts the corresponding second housing shoulder surface (24) as the fastener is tightened. At least one of the abutting second housing (24) and fastener (40) shoulder surfaces defines a convex tapered portion and the other of the respective abutting shoulders (24, 40) defines a concave tapered portion, so that tightening the fastener registers the second housing portion along the reference plane.

Abstract: A temperature activated fan assembly preferably for an electric motor. The assembly includes a fan, a torque transfer means engagable with the fan for transferring torque to the fan and a first member which expands in response to a temperature increase. The expansion of the first member causes the torque transfer means to engage the fan. The first member is situated within the motor such that the first member causes the fan to operate when a critical temperature in the motor is reached. The first member can be fabricated as a rod or coil from a material having a suitably high coefficient of thermal expansion. The first member can also be fabricated from a memory material.