# Variator

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{{expert needed|1=Engineering|talk=Definition|date=January 2015}}
{{More citations needed|date=February 2024}}
{{Multiple image|direction=vertical|align=right|image1=EvansFrictionConeHagley01.jpg|image2=Evans friction cone - Hagley Aug 2009.jpg|width=150|caption2=The [Evans friction cone](/source/Continuously_variable_transmission), 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.<ref>{{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}}</ref>

Often a variator is a mechanical [power transmission](/source/power_transmission) device that can change its [gear ratio](/source/gear_ratio) continuously (rather than in steps).<ref>{{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}}</ref>

==Examples==
* [Beier variable-ratio gear](/source/Beier_variable-ratio_gear)
* [Continuously variable transmission](/source/Continuously_variable_transmission)
* [Evans friction cone](/source/Continuously_variable_transmission)
* [NuVinci continuously variable transmission](/source/NuVinci_continuously_variable_transmission)
* [Variator (variable valve timing)](/source/Variator_(variable_valve_timing))
* [Variomatic](/source/Variomatic)
* [VANOS](/source/VANOS)

==See also==
* [Epicyclic gearing](/source/Epicyclic_gearing)

{{Commons category|Variators}}

== References ==
<references />

Category:Variators
Category:Mechanical power control

{{Mech-engineering-stub}}

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