Patent ID: 9671013
Date: 2017-06-06
CPC Classifications: F15B,F16H

Claim:
1. A hydraulic pressure supply apparatus, comprising: a first hydraulic pump having a first rotor connected to a drive source; a second hydraulic pump having a second rotor connected to the first rotor of the first hydraulic pump; a first oil passage that connects an intake port of the first hydraulic pump and a reservoir that contains hydraulic oil; a second oil passage that connects an intake port of the second hydraulic pump and the reservoir; a third oil passage that connects a discharge port of the first hydraulic pump and a hydraulic actuator; a first regulator valve that regulates pressure of the hydraulic oil discharged from the discharge port of the first hydraulic pump to the third oil passage to a line pressure; a fourth oil passage that connects a discharge port of the second hydraulic pump and a lubrication system of the hydraulic actuator; a fifth oil passage that connects excess hydraulic oil discharged from the first regulator valve to the second oil passage; a second regulator valve that regulates pressure of the excess hydraulic oil discharged from the first regulator valve to the fifth oil passage to a medium pressure that is lower than the line pressure; and an one-way valve that is installed in the second oil passage at a position between a junction to the fifth oil passage and the reservoir and permits supply of hydraulic oil from the reservoir only to the second hydraulic pump.