FRICTION ELEMENT CONTROL HYDRAULIC PRESSURE CIRCUIT IN AUTO TRANSMISSION

摘要

PURPOSE: A friction element hydraulic control circuit of an auto transmission is provided to adjust a plurality of cams controlling displacement of a pressure control valve, thereby enabling to provide operation pressure. CONSTITUTION: A supply pressure line supplying operation pressure connects a plurality of pressure control valves to a plurality of friction elements(50). The displacement of the pressure control valve is controlled in order to open and close a passage of the supply pressure line. A cam driving part is rotated using a motor(10). The cam driving part comprises a plurality of cam profiles controlling the displacement with respect to each pressure control value. A cam driving device is arranged on one motor generating torque and a cam shaft rotating through the motor.