Describe working of continuously variable transmission with suitable sketch

Describe working of continuously variable transmission with suitable sketch
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Answer :

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A Vario-drive consists of two set of split pulleys - drive and driven pulley and drive belt between the pulleys. The drive pulley is fitted to the crankshaft and driven to rear wheel. The variator (drive pulley) consists of a fixed face and a movable face. The movable face is capable of sliding axially on the boss of the fixed face. The ramp plate is fixed by a nut and is pushes in the weight rollers against the drive face.

As the speed of the engine increases, or load on the rear wheel decreases, centrifugal force on the weight rollers increases thus rollers are thrown radially outward. When rollers are forced outward, they press-in the movable face of the drive pulley closer to the drive face which results in increasing effective diameter of drive pulley at the same time effective diameter of driven pulley gets decreased thus a reduced drive ratio between the driven and drive pulleys is obtained.

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