Patent ID: 6981568
Filing Date: 2006-01-03
Classification: B62D

Abstract:
1. A vehicle speed response type power steering system, comprising: connecting means, disposed between a valve sleeve and a valve spool of a control valve, for changing rotational force applied to rotate said valve spool in relation to said valve sleeve in response to a pressure provided to said connecting means; a solenoid valve for controlling a flow rate of oil provided from a power steering pump to supply the oil to said connecting means; a controller controlling said solenoid valve in response to the vehicle speed; a cut-off valve controlling the flow rate of oil returned to an oil reservoir in response to pressure change of oil provided to said connecting means; wherein the connecting means comprises: an extension ring integrally connected to said valve sleeve; a reaction ring installed at a periphery of said valve spool for relative rotation of said reaction ring to be limited in relation to said valve spool and for an axial linear movement of said reaction ring to be enabled in relation to said valve spool; a spring and a spring seat disposed to press said reaction ring to a lateral surface of said extension ring; two control grooves formed to face each other in between said extension ring and said reaction ring for controlling the relative rotation of said reaction ring against said extension ring; a control ball inserted into said control groove; and a valve cap facing said reaction ring with a reaction chamber formed between said valve cap and said reaction ring while said spring and said spring seat are formed in said reaction chamber which forms a pressure to be applied to said reaction ring.