Hydraulic pressure supply system of automatic transmission

摘要

An automatic-transmission hydraulic pressure supply system includes a low-pressure hydraulic pump supplying low hydraulic pressure to a first low-pressure line, a low-pressure regulator valve recirculating through a first recirculation line a portion of the hydraulic pressure supplied through the first low-pressure line to regulate the hydraulic pressure of the first low-pressure line, and supplying the regulated hydraulic pressure to a low pressure portion through a second low-pressure line, a high-pressure hydraulic pump receiving a portion of the hydraulic pressure of the first low-pressure line, increasing and supplying the increased hydraulic pressure to a high pressure portion through a high-pressure line, and a high-pressure regulator valve recirculating a portion of the hydraulic pressure supplied through the high-pressure line through second and/or third recirculation lines, and supplying the regulated hydraulic pressure to the high pressure portion.

主权项

1. A hydraulic pressure supply system of an automatic transmission for a vehicle, comprising:
a low-pressure hydraulic pump receiving oil from an oil pan through an input line, generating a low hydraulic pressure to the oil and supplying the oil of the low hydraulic pressure to a first low-pressure line; a low-pressure regulator valve connected to the first low-pressure line, recirculating through a first recirculation line a portion of the oil of the low hydraulic pressure supplied through the first low-pressure line directly to the input line to regulate the low hydraulic pressure of the first low-pressure line, and supplying the regulated low hydraulic pressure to a low pressure portion through a second low-pressure line; a high-pressure hydraulic pump connected to the first low-pressure line, receiving a portion of the oil of the low hydraulic pressure in the first low-pressure line, increasing the low hydraulic pressure to a high hydraulic pressure, and supplying the oil of the increased hydraulic pressure to a high pressure portion through a high-pressure line; and a high-pressure regulator valve connected to the high-pressure line, recirculating a portion of the oil of the high hydraulic pressure supplied through the high-pressure line directly to the first low-pressure line through a second recirculation line, selectively recirculating a portion of the oil of the high hydraulic pressure supplied through the high-pressure line to the second recirculation line through a third recirculation line, and supplying the oil of the high hydraulic pressure regulated through the high-pressure regulator valve to the high pressure portion, wherein the third recirculation line is selectively connected to the second recirculation line according to a strength of the high hydraulic pressure of the oil in the high-pressure line.