Patent ID: 11946224
Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
Field: Mechanical elements (Mechanical engineering)
Classification: CPC E  F | IPC E  F

Claim 0:
1. A construction machine that includes:
a hydraulic cylinder;
a first accumulator that accumulates return fluid from the hydraulic cylinder with a first set pressure;
a tank that stores hydraulic fluid therein;
a first hydraulic pump that delivers the hydraulic fluid sucked from the tank;
a hydraulic actuator that is driven by the first hydraulic pump; and
a second accumulator that accumulates return fluid from the hydraulic actuator with a second set pressure,
the construction machine comprising:
a first control valve placed in a first hydraulic line that connects the first accumulator and the hydraulic cylinder to each other; and
a second control valve placed in a second hydraulic line that connects the second accumulator and the hydraulic cylinder to each other, wherein
the second set pressure is set to a value higher than that of the first set pressure.