Some cone CVT layouts use two rollers.[23][24] In 1903, William Evans and Paul Knauf applied for your patent on the continuously variable transmission applying two parallel conical rollers pointing in opposite Instructions and connected by belts that would be slid alongside the cones to fluctuate the transmission ratio. Based on https://emilianozazvu.is-blog.com/39153388/the-ultimate-guide-to-gearbox-cvt