Motor-driven power steering device

Details Motor-driven power steering device Motor-driven power steering device

B - Operations, Transporting

62

D

180/56

B62D 5/04 (2006.01)

Patent

CA 1265751

ABSTRACT OF THE DISCLOSURE A motor-driven power steering device includes an electric motor for generating assistive torque which is applied through a ball screw mechanism to a steering gear mechanism to reduce manual steering forces applied by the driver to steer a motor vehicle. The motor-driven power steering device comprises a rack-and-pinion steering gear mechanism for converting rotation of a pinion shaft to axial movement of a rack shaft, an electric motor for generating assistive torque to be applied to the rack-and- pinion steering gear mechanism, and a ball screw mechanism for converting the assistive torque from the motor to the axial movement of the rack shaft. The ball screw mechanism has a screw shaft having a helical groove defined in an outer peripheral surface thereof and extending substantially parallel to the rack shaft, the screw shaft being receptive of the assistive torque generated by the motor, a nut having a helical groove defined in an inner peripheral surface thereof and disposed around the screw shaft, the nut being nonrotatably coupled to the rack shaft, and a plurality of balls disposed in and between the helical grooves of the screw shaft and the nut. - 16 -

531709

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