CONTINUOUSLY VARIABLE TRANSMISSION AND CONTROL METHOD THEREFOR

摘要

A continuously variable transmission with an annular band body including grooves meshable with movable teeth provided on a second pulley and a biasing unit configured to bias the movable teeth radially outwardly of a shaft portion is provided with a hydraulic control unit configured to reduce a hydraulic pressure in a second oil chamber when a speed ratio reaches a predetermined speed ratio at which the grooves are meshed with the movable teeth.

主权项

1. A continuously variable transmission, comprising:
a first pulley including a first fixed conical plate and a first movable conical plate configured to move in an axial direction according to a hydraulic pressure supplied to and discharged from a first oil chamber; a second pulley including a second fixed conical plate, a second movable conical plate configured to move in an axial direction according to a hydraulic pressure supplied to and discharged from a second oil chamber and movable teeth movable in a radial direction of a shaft portion; an annular band body mounted between the first and second pulleys, configured to transmit power between the first and second pulleys and formed with grooves meshable with the movable teeth on an inner peripheral surface; a biasing unit configured to bias the movable teeth radially outwardly of the shaft portion; an oil pump driven by a power source and configured to supply the hydraulic pressure to the first and second oil chambers; and a hydraulic control unit configured to reduce a hydraulic pressure in the second oil chamber when a speed ratio reaches a predetermined speed ratio at which the grooves are meshed with the movable teeth.