×

Vehicle speed responsive power steering assembly

  • US 4,759,419 A
  • Filed: 10/16/1986
  • Issued: 07/26/1988
  • Est. Priority Date: 10/18/1985
  • Status: Expired due to Term
First Claim
Patent Images

1. A power assist steering assembly for vehicle comprising:

  • a power assist actuator for providing power assist;

    a pump for supplying pressurized fluid to said power assist actuator;

    a steering control valve for controlling flow of pressurized fluid to said power assist actuator, said steering control valve comprising a valve member manually movable away from a neutral position to increase the flow of pressurized fluid to said power assist actuator in accordance with steering torque;

    conduit means for communicating the flow of pressurized fluid from said pump to said steering control valve;

    a restriction orifice located in said conduit means;

    control means for controlling the flow of pressurized fluid through said restriction orifice in accordance with vehicle speed; and

    means for resisting movement of said valve member to increase flow of pressurized fluid to said power assist actuator with a force which increases as vehicle speed increases, said resisting means comprising a first fluid chamber, a spring located in said first fluid chamber for biasing said valve member to the neutral position thereof, a second fluid chamber the pressure in which counteracts the action of said spring, and first and second conduits for communicating said first and second fluid chambers with the downstream and upstream sides of said restriction orifice, respectively.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×