| 摘要 |
<p>A hydraulic driving apparatus of a caterpillar vehicle including a hydraulic pump (2), a pair of right and left driving motors (3, 4) driven by pressure oil discharged from said pump, a plurality of actuators including at least one actuator (5) besides these motors, a plurality of flow rate control valves (6, 8, 10) for controlling the flows of the pressure oil supplied to these actuators, and a plurality of branched flow compensation valves (7, 8, 11) for controlling differential pressures across these flow rate control valves, each of the branched flow compensation valves having driving means (7d, 7f, 9d, 9f, 11d, 11f) for setting the target value of differential pressure across the corresponding flow rate control valve. The apparatus is further equipped with first means (28) for outputting a switch signal for changing the operation speeds of the pair of driving motors (3, 4) and second means (30, 31) for controlling the driving means (7f, 9f) of the branched flow compensation valves (7, 9) related with the pair of the driving motors in accordance with the switch signal outputted from the first means and changing the target values of differential pressures across the corresponding flow rate control valves (6, 8).</p> |
