| 摘要 |
<p>A hydraulic drive system including at least one hydraulic actuator (7a, 7b), two variable displacement hydraulic pumps (3a, 3b) each connected to the hydraulic actuator to form a closed circuit therewith and connected in parallel with each other, two prime movers (1a, 1b) each driving one of the hydraulic pumps, and directional control valves (21a, 21b) each arranged between the hydraulic actuators and one of the hydraulic pumps. The directional control valves (21a, 21b) are each operative to shut, when one of the prime movers associated therewith is shut down, the hydraulic pump connected to the shutdown prime mover off the other hydraulic pump and the hydraulic actuator, to thereby prevent the hydraulic pump from being rotated by the pressure fluid delivered by the other hydraulic pump.</p> |
