| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a steering device for a construction vehicle which is not only suitable for the travel on a general vehicular road, but also suitable for work at a construction site, and capable of performing reliable steering operation. <P>SOLUTION: The steering device for the construction vehicle comprises a directional selecting valve 5 for controlling the flow of a pressurized oil to a vehicle body bending hydraulic cylinder 2 to perform the steering, and a signal generating means 6 for a steering wheel to change the directional selecting valve 5 by outputting a pilot signal to the directional selecting valve 5 by the operation of a steering wheel 7a, and further comprises a signal generating means for a lever composed of pressure proportional solenoid valves 12a, 12b for generating the pilot signal for changing the directional selecting valve 5 by the operation of the lever 10a, selecting valves 13a, 13b for changing the pilot signal from both signal generating means to the directional selecting valve 5 in a selectively outputting manner, and an automatic changing means for changing the selecting valves 13a, 13b so that the pilot signal from the signal generating means 6 for the steering wheel can be preferentially output to the directional selecting valve 5 when operating the steering wheel 7a. <P>COPYRIGHT: (C)2008,JPO&INPIT |
