| 摘要 |
<p>A stream separating or combining change-over system of a plurality of pumps in a load sensing system of a hydraulic machine, wherein required amounts of oil can be supplied to respective actuators and energy loss can be prevented from occurring. For this purpose, the stream separating or combining change-over system comprises: a stream combining circuit (13) for connecting respective discharge circuits (11, 12) starting at respective variable capacity type hydraulic pumps (1, 6) and ending at directional change-over valves (4, 5), (9, 10) to each other; a stream separating or combining change-over valve (14) provided on this stream combining circuit; means for detecting ON-OFF operation of a control lever (26) of the actuator; and means for changing over the stream separating or combining change-over valve on the basis of the result of detection.</p> |
