Patent ID: 8312793

Claim:
A hydraulic pressure supply device for industrial vehicle, comprising: a first hydraulic pump and a second hydraulic pump that are driven by an engine; a first hydraulic circuit that leads, as clutch control pressure, pressurized oil which is supplied from the first hydraulic pump to a transmission after regulating the pressurized oil by a pressure regulation valve, and that leads, as torque converter operation oil, pressured oil which has passed through the pressure regulation valve to a torque converter, and then leads pressurized oil which has passed through the torque converter to an oil cooler; a safety valve that is connected to the first hydraulic circuit between the pressure regulation valve and the torque converter and, that releases pressurized oil on a torque converter entrance side to a reservoir when pressure on an entrance side of the torque converter is equal to or greater than a predetermined value; a second hydraulic circuit, through which pressurized oil from the second hydraulic pump is distributed to a circuit portion downstream of the pressure regulation valve and upstream of the safety valve and to a circuit portion downstream of the torque converter and upstream of the oil cooler; and a flow control device that changes a proportion of a rate of flow in the second hydraulic circuit so that a proportion of the rate of flow to the circuit portion downstream of the torque converter and upstream of the oil cooler increases as pressure at an entrance of the torque converter increases.