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

Claim 3:
4. The construction machine according to claim 2, further comprising:
a second hydraulic pump;
a second pressure sensor that senses a pressure of the first accumulator; and
a third control valve capable of switching, in response to a control signal from the controller, a delivery port of the second hydraulic pump between a charge position in which the delivery port of the second hydraulic pump is connected to the first accumulator and an unload position in which the delivery port of the second hydraulic pump is connected to the tank, wherein
the controller is configured to control the third control valve such that, in a case where the pressure of the first accumulator is lower than the first set pressure, the third control valve is switched to the charge position, and in case where the pressure of the first accumulator is equal to or higher than the first set pressure, the third control valve is switched to the unload position.