Patent ID: 9334951
Filing Date: 2016-05-10
CPC Classification: F04C,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 though 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 switch valve connecting the second discharge line connected to the second pump chamber selectively to a first low-pressure line or a bypass line connected to the high-pressure line, and supplying the hydraulic pressure generated at the second pump chamber selectively to the first low-pressure line or the bypass line; and a low-pressure regulator valve connecting the first low-pressure line to a second low-pressure line connected to the low pressure portion, regulating the hydraulic pressure supplied to the low pressure portion through the first low-pressure line and the second low-pressure line to be stable, and recirculating surplus hydraulic pressure to the first input line through a second recirculation line connected to the first input line, wherein the second discharge line and the second input line are selectively connected.