Belt-type continuously variable transmission

摘要

A belt-type continuously variable transmission (1) has a pulley side pressure control valve (40) for controlling side pressures of driving and driven pulleys (5, 8) and a controller (60) for controlling the pulley side pressure control valve (40). This controller (60) has a correcting device (63) for correcting a belt transmission torque calculated by a belt transmission torque calculator (62) when the polarity of the belt transmission torque changes. This correcting device (63) adds to the belt transmission torque for a predetermined time a correction value (TDG) corresponding to a peak torque (TP) of the belt transmission torque (TBLT) arising at times of throttle opening and closing. That is, because the nelt transmission torque is corrected in correspondence with the peak torque arising at times of throttle opening and closing, the side pressures of the pulleys (5, 8) are kept at suitable values at all times and slippage of the metal V-belt (7) is prevented.