| 摘要 |
<p>PURPOSE: To easily ensure a desired steering ratio by forming a fluid controller for controlling the flow of fluid to a power cylinder by a valve having a variable orifice for increasing the flow area as it is displaced from the neutral position to the operating position. CONSTITUTION: A hydraulic steering system has a fluid pump 11, a load sensing type flow control valve 15, a fluid controller 17 to which a power cylinder 19 is connected, and an open center auxiliary circuit represented by a variable orifice 21. In this case, the fluid controller 17 includes a valve 49 capable of moving from the neutral position to the right-handed turn position R or right- handed turn position L, and a flow meter 51 which measures a flow of fed fluid and functions to return the valve 49 to the neutral position when a proper quantity of fluid is fed to the power cylinder 19. The valve 49 is formed by variable flow control orifices 121, 123 for increasing the flow area when the valve is displaced from the neutral position to the operating position.</p> |
