Patent ID: 9234578
Filing Date: 2016-01-12
CPC Classification: F04B,F16H,Y10T

Claim Text:
1. A hydraulic pressure supply system of an automatic transmission for a vehicle which generates low hydraulic pressure and high hydraulic pressure using oil stored in an oil pan and supplies the low hydraulic pressure and the high hydraulic pressure respectively to a low pressure portion and a high pressure portion, the hydraulic pressure supply system comprising: a low-pressure hydraulic pump driven by a first power source so as to pump the oil stored in the oil pan, generating the low hydraulic pressure, and supplying the low hydraulic pressure to the low pressure portion; a high-pressure hydraulic pump driven by a second power source and fluid-connected to the low-pressure hydraulic pump so as to receive the low hydraulic pressure from the low-pressure hydraulic pump, changing the low hydraulic pressure into the high hydraulic pressure, and supplying the high hydraulic pressure to the high pressure portion; a pump housing receiving the low-pressure hydraulic pump and the high-pressure hydraulic pump coaxially therein; a clutch mounted in the pump housing and selectively connecting a first drive shaft coupled to the first power source in the low-pressure hydraulic pump with a second drive shaft coupled to the second power source in the high-pressure hydraulic pump; and a solenoid valve selectively supplying operating pressure to the clutch.