Patent ID: 11905684
Assignee: KUBOTA CORPORATION
Field: Civil engineering (Other fields)
Classification: CPC E  F | IPC E

Claim 8:
9. A hydraulic system for a working machine, the hydraulic system comprising:
a first hydraulic pump;
a first hydraulic device to be actuated by hydraulic fluid delivered by the first hydraulic pump;
a hydraulic fluid tank to store hydraulic fluid;
a first discharge fluid passage to allow hydraulic fluid discharged from the first hydraulic device to flow into the hydraulic fluid tank;
a second hydraulic pump to suck hydraulic fluid from the hydraulic fluid tank through a suction fluid passage, the second hydraulic pump being connected to the hydraulic fluid tank via the suction fluid passage;
a second hydraulic device to be actuated by hydraulic fluid delivered by the second hydraulic pump, the second hydraulic device being configured such that a difference between a flow rate of hydraulic fluid supplied from the second hydraulic pump to the second hydraulic device and a flow rate of hydraulic fluid discharged from the second hydraulic device changes according to a manner in which the second hydraulic device is actuated;
a second discharge fluid passage to allow hydraulic fluid discharged from the second hydraulic device to flow into the first hydraulic pump, the second discharge fluid passage being connected to a suction port of the first hydraulic pump;
a connecting fluid passage branching off from the second discharge fluid passage and connected to the suction fluid passage; and
a supplier to additionally supply hydraulic fluid to the second discharge fluid passage, the supplier being connected to the second discharge fluid passage, wherein
the supplier is an auxiliary tank to store hydraulic fluid independently of the hydraulic fluid tank and to supply the stored hydraulic fluid to the second discharge fluid passage.