| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress the effect of a pressure accumulation action on a plurality of pumps with the reduction in torque consumption due to pressure accumulation by the accumulator on the assumption that one pump in the plurality of hydraulic pumps is configured to serve also as a pressure accumulation source. <P>SOLUTION: A hydraulic circuit for construction machinery is configured such that an actuator line 18 and a pressure accumulation line 19 are connected to each other through a distribution valve 17 in a pump line 16 of a third pump 3 and third pump oil is supplied to an accumulator circuit B and a main circuit A side by side in a pressure accumulation position (b) of the distribution valve 17 and when the pressure accumulation is completed, the third pump oil is supplied only to the main circuit A. On the assumption of such a configuration, an opportunity of the pressure accumulation is controlled to be reduced by introducing pressure oil which is made high pressure selection in a first and a second pump 1, 2 into a primary side of a pressure reducing valve 12 and utilizing for the pressure accumulation of an accumulator 11. <P>COPYRIGHT: (C)2013,JPO&INPIT |
