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Continuously variable gearboxes do they exist as separate parts?

  1. Jul 24, 2011 #1
    I'm sure many of you are aware of CVTs or continuously variable transmissions. Many of you are also aware, I am sure, of off-the-shelf gearboxes which you can use to step up/down (typically) the output of a motor.

    Do they have a device which allows a variable gear ratio, especially one controlled by an electrical signal?
     
  2. jcsd
  3. Jul 24, 2011 #2
    How about this

    http://www.piv-drive.com/gb/9000.asp [Broken]
     
    Last edited by a moderator: May 5, 2017
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