Steering damper system

Abstract

A liquid pressure type steering damper system for generating a damping force for preventing a handle from being swung due to a kick-back upon a disturbance wherein the generation of the damping force is nonlinear so that the steering angle would not be enlarged so much even if the kick-back becomes greater. A liquid pressure type steering damper is provided with a restriction passage for a working liquid and a solenoid-type control valve for varying the passage sectional area of the restriction passage. A needle portion is formed at the tip end of a plunger constituting the solenoid valve and is made to advance and retract in a restriction portion connected to a bypass passage. An annular gap passage is formed between the needle portion and the inside wall of the restriction portion so that, when the needle portion advances or retracts in proportion to the steering speed of a front wheel steering system, the clearance area of the gap passage is varied in the manner of a quadric curve in relation to the stroke amount of the needle portion, whereby the generation of the damping force is rapidly increased in the manner of a quadric curve. In addition, an upper limit of the damping force is restricted by an electromagnetic force of the solenoid valve.

Dependencies are inferred from the claim text.