Patent ID: 11898327
Assignee: KUBOTA CORPORATION
Field: Mechanical elements (Mechanical engineering)
Classification: CPC E  F | IPC E  F

Claim 5:
6. The hydraulic system according to claim 5, wherein
the operation lever is operable in a predetermined first direction and a predetermined second direction different from the first direction, and
the at least one pilot valve includes a first output port to output the pilot fluid in accordance with an amount by which the operation lever is operated in the first direction, and a second output port to output the pilot fluid in accordance with an amount by which the operation lever is operated in the second direction;
the at least one pilot fluid passage includes a first pilot fluid passage connected to the first output port and a second pilot fluid passage connected to the second output port;
the first control valve is connected to the first pilot fluid passage and the second pilot fluid passage and is operable by the pilot fluid supplied through the first pilot fluid passage and the second pilot fluid passage;
the second control valve is a switching valve operable in a predetermined third direction and a predetermined fourth direction different from the third direction;
the first proportional valve is operable to change, to operate the second control valve in the third direction, the pressure of the pilot fluid to be supplied to the second control valve;
the second proportional valve is operable to change, to operate the second control valve in the fourth direction, the pressure of the pilot fluid to be supplied to the second control valve;
the blocking switching valve is capable of blocking the first pilot fluid passage and the second pilot fluid passage;
the at least one pressure sensor includes a first pressure sensor provided in the first pilot fluid passage between the first output port and the blocking switching valve to detect a first pressure in the first pilot fluid passage, and a second pressure sensor provided in the second pilot fluid passage between the second output port and the blocking switching valve to detect a second pressure in the second pilot fluid passage; and
the controller is configured or programmed to, after causing the blocking switching valve to operate to block the first pilot fluid passage and the second pilot fluid passage, control the first proportional valve and the second proportional valve, based on the first pressure detected by the first pressure sensor and the second pressure detected by the second pressure sensor.