Patent ID: 9353854
Filing Date: 2016-05-31
CPC Classification: F15B,F16H

Claim Text:
1. A hydraulic pressure supply system of an automatic transmission for a vehicle, comprising: a hydraulic pump provided with first and second pump chambers formed therein, wherein the first and second pump chambers are connected to an oil pan respectively through first and second input lines and discharge generated hydraulic pressure respectively through first and second discharge lines; a high-pressure regulator valve disposed on a high-pressure line connected to the first discharge line and a high pressure portion, regulating hydraulic pressure supplied from the first and second pump chambers to the high pressure portion through the high-pressure line to stable hydraulic pressure, and supplying surplus hydraulic pressure to a low pressure portion through a first recirculation line connected to the high-pressure regulator valve; a first switch valve connecting the second discharge line connected to the second pump chamber selectively to a first bypass line connected to the high-pressure line or a first low-pressure line, and controlled by variable control pressure of a solenoid valve so as to supply the hydraulic pressure generated at the second pump chamber selectively to the high-pressure line or the first low-pressure line; a second switch valve connecting the first low-pressure line selectively to a second bypass line connected to the first input line connected to the first pump chamber or a second low-pressure line, and controlled by the variable control pressure of the solenoid valve so as to recirculate hydraulic pressure supplied through the first low-pressure line to the first input line connected to the first pump chamber or supply the hydraulic pressure supplied through the first low-pressure line to the second low-pressure line; and a low-pressure regulator valve selectively connecting the second low-pressure line to a third low-pressure line connected to the low pressure portion, regulating hydraulic pressure supplied to the low pressure portion through the second low-pressure line and the third low-pressure line to stable hydraulic pressure, and recirculating the surplus hydraulic pressure to the first input line through a second recirculation line connected to the second bypass line.