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What is a continuously variable transmission? A continuously variable transmission, or CVT, is a type of automatic transmission that provides more useable power, better fuel economy and a smoother driving experience than a traditional automatic transmission. Conventional automatic transmissions use a set of gears that provides a given number of ratios (or speeds).
Automatic transmissions that use gears need to switch between gear positions, while CVT does not. Since power from the engine is continuously fed to the tires, the ride is smoother. With CVT, diameters of the areas where the two pulleys meet the belt can be infinitely varied (Figure 1). Each pulley consists of two conical plates facing each other, which by moving closer or further apart, changes the diameter of the area meeting the belt (Figure 2).