Electric motor-driven positioning element
AssigneeGeneral Motors Corporation
InventorPaul Bausch
Life of this patent
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Abstract
In an electric motor-driven positioning element for steering the rear wheels of a passenger car, a rotor of an electric motor is mounted on a ball nut which is adapted to effect axial displacement of a ball screw. The ball nut supports on a flange the shafts of pinions of a planetary gear unit, with the sun wheel of that planetary gear unit being driven by the rotor of the electric motor. The housing accommodates an electro-magnetic dog clutch which serves to block the ball nut during the time the electric motor is not energized.
Claims8
An electric motor-driven positioning element for steering a rear wheel of a passenger car, including a housing with a positioning member in the form of a ball screw which is adapted for axial displacement effected by a rotatable ball nut, and wherein the ball nut is driven by an electric motor via a planetary gear unit, with the rotor of the electric motor driving a sun gear, and the sun gear intermeshing with planetary pinions driving the ball nut, the improvement wherein:
- the ball nut is a hollow shaft, and the rotor of the electric motor is rotatably mounted on the ball nut.
Dependencies are inferred from the claim text.