Patent ID: 6810772
Filing Date: 2004-11-02
Classification: F16H,Y10T

Abstract:
An automatic transmission in a power unit with a torque converter and a hydraulic clutch adapted to be engaged and disengaged in switching of speed-change gears, said automatic transmission comprising:a pressure control valve provided at a discharge port of an oil pump for supplying hydraulic oil to said hydraulic clutch; said pressure control valve comprising: a valve body; a valve element axially slidably provided in said valve body; and a spring provided between said valve element and said valve body in a sliding direction of said valve element for adjusting a set pressure for opening/closing of said pressure control valve; said valve element being urged in its closing direction by a repulsive force applied to a stator in said torque converter; said valve element includes an aperture for selectively being in communication with a pressure relief chamber.