| 摘要 |
Provided is a hydraulic drive device with which the operability of multiple single-rod hydraulic cylinders is improved. The drive device is configured so as to be equipped with: a closed circuit (A) wherein a first and a third hydraulic pump (12, 14) and a boom cylinder (1) are connected in a closed loop via switching valves (43a, 45a); multiple open circuits (E, F), equipped with a second and a fourth hydraulic pump (13, 15) and with switch valves (44a, 46a) that switch the destination to which operating oil flowing from the second and the fourth hydraulic pump (13, 15) is supplied; and a connecting pipeline (301) connected to the sides of the switching valves (44a, 46a) from which the operating oil flows, and connected to the closed circuit (A). |
