Patent ID: 7614224

Claim:
A hydraulic system of a hybrid type industrial vehicle drivable by an engine and an electric motor, comprising: a cargo handling circuit through which hydraulic oil used in a cargo handling operation of the industrial vehicle flows; a steering circuit through which hydraulic oil used in a steering operation of the industrial vehicle flows; a generator motor driven by the engine to generate electricity; a cargo handling hydraulic pump that is actuated in conjunction with an operation of the generator motor and supplies hydraulic oil to the cargo handling circuit; a battery storing electricity generated by the generator motor; a steering electric motor driven by electricity supplied from the battery; a steering hydraulic pump that is actuated in conjunction with an operation of the steering electric motor and supplies hydraulic oil to the steering circuit; a bypass passage connecting the cargo handling circuit and the steering circuit to each other, wherein the hydraulic oil of the cargo handling circuit is supplied to the steering circuit through the bypass passage; and a switching valve located in the bypass passage.