Hydraulic driving device of work machine
AssigneeHitachi Construction Machinery Co., Ltd.
InventorsMasamichi Ito, Takatoshi Ooki, Kiwamu Takahashi
Life of this patent
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Abstract
To keep operability of a hydraulic actuator excellent even in a state pressure has been sufficiently accumulated in a pressure accumulator. In a hydraulic driving device of a work machine including a hydraulic actuator, a tank, a flow control valve, and a pressure accumulator, there are further provided with a first pressure compensation valve that is for controlling difference between front and back pressures of the flow control valve constant and a second pressure compensation valve that is arranged between the pressure accumulator and the tank and is for controlling difference between front and back pressures of the flow control valve and the first pressure compensation valve constant.
Claims5
A hydraulic driving device of a work machine, comprising:
- a hydraulic actuator that is operated by hydraulic oil supplied;
- a tank that stores return oil from the hydraulic actuator;
- a flow control valve for making hydraulic oil discharged from the hydraulic actuator flow toward the tank;
- and
- a pressure accumulator that accumulates pressure of the hydraulic oil that flows from the flow control valve toward the tank, wherein
- there are provided:
- a first pressure compensation valve that is arranged between the hydraulic actuator and the pressure accumulator and is for controlling difference between front and back pressures of the flow control valve constant;
- and
- a second pressure compensation valve that is arranged between the pressure accumulator and the tank and is for controlling difference between front and back pressures of the flow control valve and the first pressure compensation valve constant.
Dependencies are inferred from the claim text.