Variator

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For car engine variable valve timing, see Variator (variable valve timing).
The Evans friction cone, a type of cone ring transmission. Moving the friction ring between the two cones varies the effective gear ratio

A variator is a device that can change its parameters, or can change parameters of other devices.

Often a variator is a mechanical power transmission device that can change its gear ratio continuously (rather than in steps).

See also[edit]