| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydraulic control of construction equipment capable of more effectively improving the fuel consumption performance.SOLUTION: A hydraulic control 11 comprises: a regenerative motor 23 connected to an engine 12; an accumulator 22 connected to the regenerative motor 23 through a regeneration passage R2; and a release pressure change valve 25 provided along the regeneration passage R2. The release pressure change valve 25 includes: a spool 25a which can shift between a regeneration position to allow hydraulic fluid to be supplied to the regenerative motor 23 from the accumulator 22 and a stop position to stop supplying hydraulic fluid to the regenerative motor 23 from the accumulator 22; a pilot port 25b connected to supply passages R6 and R7; and a spring 25c for, when the supply pressure to the pilot port 25b is less than the pre-set supply pressure threshold value, switching the spool 25a to the stop position, and when the supply pressure is more than the supply pressure threshold value, energizing the spool 25a so that the spool 25a switches to the regeneration position.SELECTED DRAWING: Figure 1 |
