Patent ID: 7353649

Claim:
A hydraulic pressure supply device for supplying pressurized working oil to a power steering device and a cargo handling device of an industrial vehicle, comprising: a hydraulic pump which discharges the pressurized working oil; a flow rate control valve which distributes the pressurized working oil to the power steering device and the cargo handling device, the flow rate control valve varying a distribution ratio between the pressurized working oil distributed to the power steering device and the pressurized working oil distributed to the cargo handling device according to a load signal pressure indicative of an amount of the pressurized working oil required by the steering device; and a programmable controller programmed to: cause a discharge flow rate of the hydraulic pump to increase when the cargo handling device is in operation and decrease when the cargo handling device stops operation; determine if the cargo handling device has stopped operation in a state where both the power steering device and the cargo handling device are in operation; and cause a delay in decreasing the discharge flow rate of the hydraulic pump when the cargo handling device has stopped operation in a state where both the power steering device and the cargo handling device are in operation.