Patent ID: 6318495
Filing Date: 2001-11-20
Classification: B62D

Abstract:
A power steering apparatus for applying steer-assisting force to a steering mechanism in accordance with operations of a steering means, comprising:a steering angle detector for detecting a steering angle of the steering means;a control valve for which a hydraulic oil flows from a hydraulic pump that is driven by an electric motor, being located between the hydraulic pump and hydraulic cylinder for steer-assisting;a controller for setting the electric motor not to exceed predetermined revolutions when the detected steering angle is smaller than a predetermined value, and for performing control of revolutions of the electric motor in accordance with a steering angular velocity of the steering means when the steering angle exceeds the predetermined value,wherein when the steering angle is smaller than the predetermined value, a pressure of the hydraulic oil to be supplied to the hydraulic cylinder is not raised; anda connecting shaft for connecting the steering means and the steering mechanism, wherein a spring coefficient of the shaft is set to be a value in which the pressure of the hydraulic oil to be supplied to the hydraulic cylinder is not raised when the steering angle is smaller than the predetermined value.