Continuously variable gearboxes do they exist as separate parts?

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Continuously variable transmissions (CVTs) are recognized for their ability to provide variable gear ratios. The discussion explores whether separate components exist that can achieve this functionality, particularly those controlled by electrical signals. A reference to a specific product from PIV Drive is provided as an example of such technology. The conversation emphasizes the need for advancements in gearboxes that can offer variable ratios independently. Overall, the inquiry highlights the interest in the development of standalone variable gear ratio devices.
KingNothing
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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?
 
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How about this

http://www.piv-drive.com/gb/9000.asp
 
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