| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydraulic control system with a pressure-receiving chamber for additionally applying the elastic force of an elastic member to one side of a flow control device, to reduce the loss of pressure passing through the flow control device and control the flow amount via a bypass, as necessary, in order to minimize the pressure to be generated by the elastic member of the flow control device in the neutral condition of a switching valve. SOLUTION: The hydraulic control system comprises the pressure-receiving chamber 180 for additionally applying the elastic force of the elastic member to one side of the flow control device to variably control the flow control device 150, when automatic speed reduction signals generated by the switching valves 110, 112 are input. Thus, the elastic force of the elastic member 142 is set to be minimized, when the input signals Pi are not applied, minimizing the loss of pressure passing through the flow control device 150. When it is necessary to control the flow amount in the bypass line 140, automatic speed reduction input signals Pi are acted on the pressure-receiving chamber 180, to further add the elastic force so that the flow control device 150 can control the flow amount through the bypass line 140. COPYRIGHT: (C)2007,JPO&INPIT
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