| 摘要 |
PURPOSE:To realize a small size and large driving force, to run smoothly even in a bad ambiance to receive earth and sand, or water, and to improve the working efficiency. CONSTITUTION:While running an automatic running vehicle 1 by a hydraulic motor 16 rotated by an operating oil fed from a pressure source 3 which has an electric motor 7, a hydraulic pump 8, and a hydraulic pressure tank 9, a working tool is controlled to drive. A floating type piston energized by a spring is provided in the hydraulic pressure tank 9, and the generation of bubble in the operating oil in the hydraulic pressure tank 9 is prevented even though the running posture of the automatic running device 1 is converted. |
