Some cone CVT models use two rollers.[23][24] In 1903, William Evans and Paul Knauf used to get a patent on a continuously variable transmission making use of two parallel conical rollers pointing in opposite directions and connected by belts that may be slid together the cones to vary the transmission https://daltonynygm.snack-blog.com/32648077/helping-the-others-realize-the-advantages-of-gearbox-cvt