| 摘要 |
PROBLEM TO BE SOLVED: To provide an automatic steering controller for an unmanned vehicle capable of making hard the lowering traveling guide accuracy due to the irregularity on a traveling road surface and being formed of less number of hydraulic equipment. SOLUTION: A manual operating steering valve 5 operated by the rotation of a steering shaft 32 is connected to a steering cylinder 9 through first and second circuits 6 and 7, an automatic control circuit having an automatic steering valve 41 is connected to the first and second circuits and, at the time of automatic traveling, the rotation of the steering shaft is locked. The automatic control circuit is formed by directly connecting a steering circuit 3 to the first and second circuits through the automatic steering valve 41. The steering circuit 3 is connected to one pressure receiving chamber 2a of a demand valve 2, and connected, through a pressure receiving circuit 24, to the other pressure receiving chamber 2b for controlling to a position for feeding a large amount of oil to the steering circuit 3 through a restrictor 24a, and directly connects the operating amount signal of the manual operating steering valve 5 and the controlled variable signal of the automatic steering valve 41 to the other pressure receiving chamber 2b through a shuttle valve 42 and the pressure receiving circuit 24. |
