Some cone CVT models use two rollers.[23][24] In 1903, William Evans and Paul Knauf applied for a patent on the constantly variable transmission making use of two parallel conical rollers pointing in opposite Instructions and connected by belts that might be slid alongside the cones to vary the transmission ratio. https://hectorprpnk.blog-gold.com/40971176/the-greatest-guide-to-gearbox-cvt