Trw Limited

Brett M Swiss

Joseph D Miller

Paul K Webber

A steering assembly (10) for turning steerable wheels of a vehicle in response to rotation of a steering wheel (12) includes a pinion (30). A steering member (14) is movable axially to effect turning movement of the steerable wheels of the vehicle. The steering member (14) has a rack portion (34) for engagement with the pinion (30) and an externally threaded screw portion (38). An electric motor (50) includes a rotor (132) drivingly connected to the steering member (14) and a stator (70). The stator (70) when energized effects movement of the rotor (132) and, thereby, rotation of the steering member (14). An electronic control unit (210) for helping to control operation of the electric motor (50) comprises at least one heat-generating component (220). A one-piece cast metal member (60) made of a homogeneous material has a main body portion (66) encapsulating and supporting the stator (70) and has an electronic control unit housing portion (102). The electronic control unit housing portion (102) of the one-piece metal member (60) includes a platform (94). The heat-generating component (220) is fastened to the platform (94) in a thermally conductive relationship.

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Shelby Township, MI, United States of America

Brett M Swiss