| 摘要 |
PURPOSE: A spool vibration preventing device of a car speed responsive type steering booster device prevents the sudden change of a pressure by installing a drifting preventing board at a return hole connecting between a hydraulic pressure control valve and a rotary valve, moreover prevents a noise by controlling the vibration of the spool CONSTITUTION: A spool vibration preventing device prevents the sudden change of a hydraulic pressure between a rotary valve(1) and a hydraulic valve(2) by installing a preventing board(4) having a flexible rubber board(41), after forming an expanding portion(35) at the center end of the return hole(34). Therefore, the spool vibration preventing device prevents a noise according to the spool(5) vibration of the hydraulic control valve(2) by preventing the sudden change of a hydraulic pressure.
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