Patent ID: 6461271
Filing Date: 2002-10-08
Classification: B60W,F16H,Y10T

Abstract:
Belt-driven continuously variable transmission comprising:a continuously variable transmission mechanism having a belt that passes over a drive pulley connected with an input shaft for receiving power from a motor and a driven pulley connected with an output shaft, and in which gear-change action is performed by receiving supply of working hydraulic fluid to a drive cylinder for pulley width setting of said drive pulley and a driven cylinder for pulley width setting of said driven pulley; a frictional engagement element provided between said motor and said drive pulley or between said driven pulley and said output shaft and that is capable of transmission control of the power from said motor with an engagement capacity responsive to the working hydraulic fluid pressure that is supplied; and side-pressure supply means that supply a first side-pressure by which the transmission torque capacity of said continuously variable transmission mechanism is determined to one of said two cylinders and that supply a second side-pressure by which said gear-change action of said continuously variable transmission mechanism is performed to the other of said two cylinders; wherein said first side-pressure is supplied to said frictional engagement element as said working hydraulic fluid pressure.