Patent ID: 8689654

Claim:
An hydraulic pressure supply apparatus for a transmission having an input shaft connected to a drive shaft of a prime mover mounted on a vehicle through a torque converter with a lockup clutch and an output shaft connected to a wheel, the transmission changing speed of an output of the prime mover inputted from the input shaft and transmitting it to the wheel through the output shaft, comprising: a hydraulic pump adapted to be driven by the prime mover and to draw up operating oil from a hydraulic pressure source and discharge the operating oil; a regulator valve adapted to regulate discharged pressure discharged from the hydraulic pump to line pressure; a first hydraulic control valve adapted to supply signal pressure to a pressure regulation port of the regulator valve; a second hydraulic control valve adapted to regulate the line pressure and supply it to the lockup clutch; a connecting section adapted to connect a hydraulic passage connecting the first hydraulic control valve and the pressure regulation port of the regulator valve with a hydraulic passage connected to an output port of the second hydraulic control valve; and a selecting mechanism installed at the connecting section and adapted to select higher-pressure one between output pressure of the first hydraulic control valve and output pressure of the second hydraulic control valve, such that the selected one acts on the pressure regulation port of the regulator valve.