Some cone CVT layouts use two rollers.[23][24] In 1903, William Evans and Paul Knauf used for just a patent over a repeatedly variable transmission making use of two parallel conical rollers pointing in reverse Instructions and connected by belts that would be slid together the cones to vary the transmission https://gearboxcvt22186.onzeblog.com/32696940/5-essential-elements-for-gearbox-cvt