| 摘要 |
PURPOSE:To simplify a hydraulic circuit by providing a piping system connecting the second actuating chamber to the first hydraulic pump, with the first auto isolation valve opening with the operation of the first hydraulic pump and closing with pressure from the second hydraulic pump when the first hydraulic pump is at rest, and further providing a piping system connecting the first actuating chamber to the second hydraulic pump, with the second valve similar to the first auto isolation valve. CONSTITUTION:A piping system connecting the second actuating chamber 7b to the first hydraulic pump 1a is provided with the first auto isolation valve 30a opening with the operation of said pump 1a and closing with hydraulic pressure from the second hydraulic pump 1b when said pump 1a is at rest. Another piping system connecting the first actuating chamber 7a to the second hydraulic pump 1b is provided with the second valve 30b similar to said valve 30a. According to the aforesaid constitution, it is unnecessary to provide a pilot pressure generating source for opening and closing said valves 30a and 30b, a pipe line and solenoid valves between the pressure generating source and the pipe line, as different from a conventional case, and it becomes possible to simplify equipment, piping, wiring and the like in a hydraulic circuit and to save cost as well.
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