| 摘要 |
<p>PURPOSE:To enable manual steering to be performed in a vehicle, when it is in a guide way branch part or the like, by providing a selector valve, provided with oil amount limiting and non-limiting positions, in a pipe line connecting a control valve of a power cylinder to an oil hydraulic pump, in case of the vehicle able to perform running on an exclusive use guide way and a general road. CONSTITUTION:The captioned vehicle is provided with a power steering device containing a drag link 1, moved by controlling a handle through a steering gear or the like, controlling a control valve 3 and operating oil for its supply to and discharge from a steering power cylinder 4 by this drag link 1. Here a solenoid selector valve 10 is provided interposing in pipe lines 9 connecting a hydraulic unit U, containing an oil hydraulic pump 6, to the control valve 3. And the solenoid selector valve 10 performs supply of the operating oil to and its discharge from the power cylinder 4 as normally, when the valve 10 is set to a position A, while forms a closed circuit, in which a pump port P of the control valve 3 communicates with its tank port T, when the valve 10 is set to a position B.</p> |
