Patent ID: 7568995

Claim:
A shift control device of a vehicular continuously variable transmission in a vehicle that is provided in a power transmission path between a vehicle power source and a driving wheel, the vehicular continuously variable transmission including a primary pulley; a secondary pulley; a belt, wrapped around the two pulleys; a primary hydraulic cylinder that alters a groove width of the primary pulley; and a secondary hydraulic cylinder that alters the groove width of the secondary pulley; the shift control device comprising: a hydraulic circuit having a shift control valve that adjusts an amount of hydraulic oil supplied to or discharged from the primary hydraulic cylinder in order to shift the continuously variable transmission, and a pressure reducing valve that outputs a predetermined oil pressure in order to cause a ratio between an oil pressure in the primary hydraulic cylinder and the oil pressure in the secondary hydraulic cylinder to be in a predetermined relationship, wherein the predetermined oil pressure is not caused to act on the primary hydraulic cylinder when the shift control valve is supplying/discharging the hydraulic oil, the predetermined oil pressure is caused to act on the primary hydraulic cylinder when the shift control valve is not supplying/discharging the hydraulic oil; and the hydraulic circuit shuts off an oil passageway connecting an output port of the pressure reducing valve and the primary hydraulic cylinder if the shift control valve, which has supplied/discharged the hydraulic oil, stops supplying/discharging the hydraulic oil when the continuously variable transmission is shifted.