| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydraulic control circuit which can reduce energy loss at a neutral position and to save energy to improve fuel efficiency, without enlarging a whole circuit. SOLUTION: A constant delivery main pump P1 is connected with selector valves 2, 3 through an oil supply passage 1, and a flow control valve 16 for controlling a supply amount in the oil supply passage 1 is disposed. The flow control valve 16 has a spring 17 coupled with a piston 20 for adjusting the spring force. The thrust of the piston 20 is adjusted by a pressure source other than the main pump P1, and the force of the spring 17 is weakened at the neutral position and is strengthened at the time of switching. |
