| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydraulic circuit capable of suppressing wasteful consumption of energy.SOLUTION: The hydraulic circuit is provided with controllers 32a, 32b. When operating hydraulic equipment 6a, 6b, the controllers supply power to electric motors 4a, 4b for driving gear pumps 3a, 3b on the basis of rotational-frequency detection signals S1 from sensors 5a, 5b and rotational-frequency command signals S3 from joysticks 9a, 9b. A discharge amount of working fluid by a variable pump 24 is compensated by the gear pumps 3a, 3b so as to prevent the variable pump 24 from discharging an excessive working oil. |
