Patent ID: 6485388
Filing Date: 2002-11-26
Classification: F16H,Y10T

Abstract:
A line pressure control system of an automatic transmission comprising:a hydraulic pump for generating hydraulic pressure; a regulator valve for adjusting the pressure from the hydraulic pump to a predetermined level; a torque converter control valve for adjusting a partial pressure from the regulator valve; a damper clutch valve receiving the adjusted pressure from the torque converter control valve for feeding the pressure to a damper clutch; a damper clutch solenoid valve for controlling the damper clutch valve; a reducing valve for reducing a partial pressure from the regulator valve and then supplying the reduced pressure to the damper clutch control valve; and a manual valve for providing hydraulic pressure to friction elements via hydraulic pressure control means and hydraulic pressure distribution means by driver's manipulation of a manual valve, wherein the regulator valve comprises: a valve body; a first and a second valve spool coaxially inserted into the valve body; a sleeve encapsulating the second valve spool; a coil spring interposed between the first and the second valve spools, wherein the second valve spool communicates with the reducing valve via a line pressure control solenoid valve and the manual valve so as to be controlled by control pressure of the line pressure control solenoid valve and reverse pressure of the manual valve.