OIL PRESSURE SUPPLY SYSTEM OF AUTOMATIC TRANSMISSION

摘要

Disclosed is an oil pressure supply system for a vehicular automatic transmission. The oil pressure supply system for a vehicular automatic transmission according to an embodiment of the present invention, wherein the system generates low oil pressure and high oil pressure by using oil stored in an oil pan and supplies the oil pressure to a low-pressure part and a high-pressure part respectively, includes the following parts: a low-pressure oil pump which sucks in oil stored in the oil pan through a first suction flow path and discharges the oil through a first low-pressure flow path; a first switch valve which selectively opens/closes a flow path of oil pressure supplied from the first low-pressure flow path; a low-pressure regulator valve which stabilizes the oil pressure which is supplied from the first switch valve through a second low-pressure flow path, and supplies the oil pressure to the low-pressure part through a third low-pressure flow path; a high-pressure oil pump which boosts oil pressure supplied from the low-pressure oil pump through the first low-pressure flow path, and discharges the oil pressure through a high-pressure flow path; a second switch valve which is placed between the first low-pressure flow path and the high-pressure flow path, and selectively opens/closes a flow path; a high-pressure regulator valve which converts the oil pressure, which is supplied from the high-pressure oil pump through the high-pressure flow path, or the oil pressure, which is selectively supplied from the low-pressure oil pump through the second switch valve, into stable high oil pressure and supplies the oil pressure to the high-pressure part; a bypass flow path which connects the first low-pressure flow path and the second low-pressure flow path together and is equipped with an orifice at one side; and a second suction flow path which connects the oil pan and the first low-pressure flow path together and is equipped with a check valve, which prevents back-flow, at one side. [Reference numerals] (4) Low-pressure part (T/C, cooling, lubrication);(8) High-pressure part (friction component)