| 摘要 |
<p>PROBLEM TO BE SOLVED: To accomplish complex drive of a left-right running motor and a reserve actuator. SOLUTION: A hydraulic circuit for a working machine is composed of a direction selector valve 13 for left run connected with a hydraulic pump 2, a direction selector valve 14 for right run connected with another hydraulic pump 3, a selector valve 17 to put in communication or out of communication with/from a communication pipeline 16 leading from the input port of the valve 13 to the input port of the other direction selector valve 14, a convergent pipeline 20 leading from the downstream of the valve 13 to the downstream of the valve 14 so that the pressure oils of the two pumps 2, 3 are converged, a reserve direction selector valve 15 installed downstream of this convergent pipeline 20 to control a reserve actuator 8, and a signal pipeline 19 to lead the signal pressure for putting the selection of the reserve valve 15 interlocking with a selector valve 17 for communication and shutting-off. A pipeline 22 is furnished to connect the selector valve 15 with the communication pipeline 16, a throttle valve 23 and a check valve 24 are installed in the connecting pipeline 22.</p> |
