Some cone CVT designs use two rollers.[23][24] In 1903, William Evans and Paul Knauf utilized for your patent over a continually variable transmission applying two parallel conical rollers pointing in opposite directions and connected by belts that would be slid alongside the cones to range the transmission ratio. From the https://gearbox-cvt39676.angelinsblog.com/31934472/the-greatest-guide-to-gearbox-cvt