| 摘要 |
PURPOSE:To eliminate a loss of energy, by closing a duct between an accumulator and a servo-valve at the time of suspension of the servo-valve, in a servo- valve circuit to which the accumulator is applied. CONSTITUTION:When hydraulic pressure of a pump 1 arrives at the upper limit of the same by applying the hydraulic pressure to ACC2, a loading valve 7 is turned off by a switch 9, a duct 12 between a servo-valve 11 and the ACC2 is opened through action of a reed valve 10 and then hydraulic oil is streamed to a cylinder 5 through action of the servo-valve 11. When the pressure of the inside of the ACC2 is lowered and arrives at the lower limit of the same, a loading valve is turned ON by the switch, pump is operated and the hydraulic oil is kept sending to the ACC2 until the pressure arrives at the upper limit. The servo-valve is turned into a neutral state before it is turned into the lower limit pressure and the duct 12 is closed by a valve after the lapse of a fixed period of time from the neutral state. The duct 12 is reopened by action of the valve through a lower limit detecting signal of the switch 9 and then the hydraulic oil from the pump 1 flows into the inside of the ACC. |
