[3] The V-belt must be very stiff while in the pulley's axial path to create only short radial movements whilst sliding out and in with the pulleys. Blend harvesters used variable belt drives as early because the fifties. Numerous tiny tractors and self-propelled mowers for property and back garden use https://gearbox-cvt43186.snack-blog.com/32647670/gearbox-cvt-for-dummies