variator

{{expert needed|1=Engineering|talk=Definition|date=January 2015}}

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{{Multiple image|direction=vertical|align=right|image1=EvansFrictionConeHagley01.jpg|image2=Evans friction cone - Hagley Aug 2009.jpg|width=150|caption2=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.{{Cite web |title=Definition of VARIATOR |url=https://www.merriam-webster.com/dictionary/variator |access-date=2024-02-19 |website=www.merriam-webster.com |language=en}}

Often a variator is a mechanical power transmission device that can change its gear ratio continuously (rather than in steps).{{Citation |title=Variator: learn how it works {{!}} Ugears STEM-lab series |url=https://www.youtube.com/watch?v=g2_mnoEDuJE |access-date=2024-02-19 |language=en}}