| 摘要 |
PROBLEM TO BE SOLVED: To provide hydraulic circuit structure of a power steering with a hydraulic flow circuit attaining effective use of pressure oil, cost reduction of circuit structure and the decrease of failure by simplifying the circuit structure with the power steering and a hydraulic device arranged in series piping using a single oil pump and having an automatic switching cock. SOLUTION: An automatic switching device 1 with an automatic switching cock 2 is interposed at an oil feed passage 14 for feeding pressure oil from a single oil pump 17 to a power steering 19, and a by-pass oil passage 8 communicating with the oil feed passage 14 is provided in front and in the rear of the automatic switching cock 2. A crane 21 or the like of a hydraulic device is interposed at the by-pass oil passage 8. The automatic switching cock 2 is switched to open/close by operation of a parking brake 11. |
