In an average CVT, You can find an input pulley that may be linked to the engine crankshaft by way of a torque converter (or clutch pack) and an output pulley that sends energy towards the wheels. A belt (or chain) connects The 2 pulleys, which may change their diameters https://dcvt73838.thezenweb.com/detailed-notes-on-d-cvt-72397367