| 摘要 |
<p>A power steering system for a wheeled vehicle comprising a fluid motor (10) connected to dirigible wheels (20) of the vehicle, a power steering pump (22) and a steering valve structure (26,28) situated in flow delivery and flow return passages that connect the pump (22) with the fluid motor, the valve structure including a pilot-operated solenoid valve means (86) that controls the by-pass flow between the supply and return sides of the pump (22) wherein a solenoid actuator (32) is adapted to apply a vehicle speed sensitive force on a pilot valve portion (160) of the valve which develops valve actuating forces on a flow control portion (154) of the valve wherein the latter is speed conscious only and does not depend upon flow to and from the pump (22) nor upon the steering pressure for the fluid motor. <IMAGE></p> |
