Electric steering actuator

Motor vehicles – Steering gear – With electric power assist

Patent

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Details

B62D 504, B62D 714

Patent

active

059883111

ABSTRACT:
In an electric steering actuator comprising an electric motor having a hollow output shaft, a steering shaft passed through the hollow center of the output shaft of the electric motor, and a ball-screw mechanism provided between the output shaft and the steering shaft for converting the rotary movement of the output shaft into a longitudinal movement of the steering shaft. The ball-screw mechanism comprises a threaded section of the steering shaft, and a nut member which threadably engages with the threaded section of the steering shaft via steel balls, and is secured to the output shaft of the electric motor via a serration coupling or the like which achieves an axially free but rotatively fast coupling between the two parts. Thus, the overall axial dimension of the actuator can be reduced, and the step of joining these two parts is significantly simplified in terms of both effort and time while the number of component parts is also reduced. In particular, by installing the ball-screw mechanism in the first casing section in an axially immobile manner, removal of the rotor or the motor assembly is substantially simplified, thereby making the actuator easier to manufacture and service. Also, the motor can be interchanged without affecting the ball-screw mechanism.

REFERENCES:
patent: 4773494 (1988-09-01), Carlson et al.
patent: 4811813 (1989-03-01), Hovanchak
patent: 5083626 (1992-01-01), Abe et al.
patent: 5086861 (1992-02-01), Peterson
patent: 5135067 (1992-08-01), Kohata et al.
patent: 5330023 (1994-07-01), Miyashita et al.
patent: 5590732 (1997-01-01), Sugino et al.
patent: 5595089 (1997-01-01), Watanabe et al.
patent: 5685390 (1997-11-01), Chikuma et al.

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