Power steering apparatus

Claim 1

A vehicle power steering apparatus for performing power steering by rotating a motor in accordance with a steering torque acting on input and output steering shafts and driving a steering direction control unit to perform power steering, said apparatus comprising: a support member; a motor having a rotatable shaft; a pair of support shafts coupled between said motor and said support member, one of said pair of support shafts being pivotably coupled to said support member to enable displacement of said other one of said pair of support shafts relative to said support member; an input steering shaft; an output steering shaft; a torsion bar coupled between said input steering shaft and said output steering shaft; a pair of gears coupled to said motor shaft at spaced locations, each of said pair of gears being coupled to a different one of said input and said output steering shafts; a sensor for generating an electrical signal corresponding to a displacement of said other one of said pair of support shafts displaced by a rotational force acting on one of said input and output steering shafts, said sensor including a moveable member coupled to said other one of said support shafts; a controller for rotating said motor at a torque represented by the electrical signal during an ON time of the electrical signal generated from said sensor; and moving means for moving said moveable member in a direction to cancel the displacement of said moveable member driven by said motor.