| 摘要 |
PROBLEM TO BE SOLVED: To provide a liquid drive system capable of preventing a rotational frequency of an engine from excessively deteriorating.SOLUTION: A hydraulic drive system 1 includes: hydraulic pumps 17L, 17R; an inclination angle adjustment device 20; a rotational frequency sensor 22; and a control device 30. The control device 30 calculates a differential value &Dgr;N of an actual rotational frequency N on the basis of the actual rotational frequency N detected by the rotational frequency sensor 22, and when the differential value &Dgr;N becomes a setting differential value &Dgr;N, the inclination angle adjustment device 20 adjusts the inclination angles of the hydraulic pumps 17L, 17R so as to make pump discharge capacities of the hydraulic pumps 17L, 17R smaller than a target discharge capacity.SELECTED DRAWING: Figure 1 |
