Editing Continuously variable transmission (section)

=== Other types ===
[[Friction drive|Friction-disk]] transmissions were used in several vehicles and small locomotives built in the early 20th century, including the [[Lambert (automobile)|Lambert]] and [[Metz Company|Metz]] automobiles. Used today in [[snow blower]]s, these transmissions consist of an output disk that is moved across the surface of the input disk upon which it rolls. When the output disk is adjusted to a position equal to its own radius, the resulting drive ratio is 1:1. The drive ratio can be set to infinity (i.e. a stationary output disk) by moving the output disk to the center of the input disk. The output direction can also be reversed by moving the output disk past the center of the input disk. The transmission on early [[Plymouth Locomotive Works|Plymouth locomotives]] worked this way, while on tractors using friction disks, the range of reverse speeds was typically limited.<ref>{{cite journal |last1=Engineers |first1=Society of Automotive |title=Tractor Friction Transmissions |journal=The Journal of the Society of Automotive Engineers |year=1918 |page=440 |url=https://books.google.com/books?id=QWnmAAAAMAAJ&pg=PP446 |language=en}}</ref>

Still in development, the magnetic CVT transmits torque using a non-contact magnetic coupling.<ref>{{cite news |url=http://www.engineerlive.com/Design-Engineer/Power_Transmission/Magnets_offer_advantages_as_an_alternative_to_mechanical_gears/22078/ |title=Magnets offer advantages as an alternative to mechanical gears |website=engineerlive.com|date=7 February 2012 |access-date=2012-02-07}}</ref> The design uses two rings of permanent magnets with a ring of steel pole pieces between them to create a planetary gearset using magnets.<ref name="magneticsmag.com">{{cite web |title=Magnetic Continuously Variable Transmission |url=https://magneticsmag.com/magnetic-continuously-variable-transmission/ |website=magneticsmag.com |access-date=16 July 2020 |date=4 November 2013}}</ref> It is claimed to produce a 3 to 5 percent reduction in fuel consumption compared to a mechanical system.<ref name="magneticsmag.com"/>