Continually Variable Transmission (CVT) is so simple in its principles, it leaves you wondering, "why did it take so long to come up with this?"
In fairness it has actually been around since 1886, originally used in textile machinery.
However, in 1958, Dutch truckbuilders DAF introduced a CVT in a 600 cc motorcar - a small engine for an automatic. The CVT was built under the brand name Variomatic, and was considered revolutionary for its time.
The DAF version was invented by Mr van Doorne, who firmly believed that the continuously variable transmission was the single best solution to mechanical power transfer.
The system works off a system of pulleys, each consisting of a pair of cones that can close together or move further apart to adjust the diameter at which the drive belt operates. Unlike conventional automatics there are no perceptible shifts. The basis of the system is a set of pulleys,
Today, the most common CVT design uses a segmented metal V-belt running between two pulleys of variable diameter, or cones. The ratios are electronically controlled to select the best overall drive ratio based on throttle position, vehicle speed and engine speed.
Originally the belts were made of rubber but suffered from fatigue, snapping after some time and leaving the unfortunate driver stranded.
However, these days CVT transmissions use steel belts, which are less susceptible to wear and tear.