Title: Steering valve with linear spool dampening

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Abstract: The invention is concerned with an improvement in a fluid controller for a power steering system which includes a housing having a fluid A for connection to the discharge side of a main fluid pump, an outlet for connection to the suction side of the main pump and a pair of ports for connection to the opposite sides of a dual acting hydraulic device such as a balanced cylinder of the power steering system for controlling the flow of pressurized fluid to the device. The controller includes a gear set which serves as a fluid meter or as a manual pump, depending upon the operativeness of the main fluid pump, and a spool valve shiftable axially to control the flow through the inlet, the gear set, the cylinder ports and the outlet. A control shaft is mounted for rotation on the housing responsive to movement of a steering wheel and is coupled to the spool valve for effecting axial shifting of the spool valve in response to rotation of the control shaft. AA wobble shaft passes from the interior of the spool valve to the gear set. A bearing plate is included between the gear set and the spool valve. The improvement comprises a fluid filled cylindrical dash pot cavity formed into said bearing plate on the spool valve side thereof positioned to receive a member extending from the spool valve and which includes restricted flow means through which said fluid is forced responsive to axial movement of said spool valve thus serving to prevent overshoot of the spool valve responsive to rotation of the control shaft and resulting over-steering of said power steering system.


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