Some cone CVT designs use two rollers.[23][24] In 1903, William Evans and Paul Knauf applied for any patent on a constantly variable transmission making use of two parallel conical rollers pointing in opposite Instructions and related by belts that may be slid along the cones to vary the transmission ratio. https://gearboxcvt05924.idblogz.com/33210521/the-best-side-of-gearbox-cvt