Some cone CVT patterns use two rollers.[23][24] In 1903, William Evans and Paul Knauf used for a patent on a continuously variable transmission utilizing two parallel conical rollers pointing in opposite directions and connected by belts that may be slid along the cones to vary the transmission ratio. Chevrolet Spark https://gearbox-cvt66418.izrablog.com/33236714/what-does-gearbox-cvt-mean