Some cone CVT models use two rollers.[23][24] In 1903, William Evans and Paul Knauf applied for your patent on a consistently variable transmission making use of two parallel conical rollers pointing in reverse directions and linked by belts that could be slid along the cones to vary the transmission ratio. https://rafaelogwjv.bloggactif.com/33854705/5-tips-about-gearbox-cvt-you-can-use-today