| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydraulic drive system of construction equipment capable of restricting the energy disappearance of hydraulic fluid while securing sufficient acceleration or deceleration when rapidly shifting the control lever of a gyration operation valve.SOLUTION: A hydraulic drive system of construction equipment comprises: a bi-directional pump 16 connected to a gyration motor 17 through a pair of supply/drain lines 31 and 32; a regulator 5 that changes a tilt angle of the bi-directional pump; and a control device 8 that controls the regulator on the basis of a gyration signal outputted from a gyration operation valve 19, in which the control device calculates an indication flow rate determined by a motor flow passing through a gyration motor and the gyration signal during gyration acceleration in which the gyration signal increases; when the indication flow rate is larger than the reference flow rate obtained by adding a specified value to the motor flow, the control device controls the regulator so that the tilt angle of the bi-directional pump to achieve the reference flow rate; and when the indication flow rate is smaller than or equal to the reference flow rate, the control device controls the regulator so that the tilt angle of the bi-directional pump to achieve the indication flow rate.SELECTED DRAWING: Figure 1 |
