CVT Transmissions

[IKE]

That book will leave out the most common CVT which is the rubber belt with expandable sheaves. This type is used on many snowmobiles, mini-bikes, and SAE Mini-Baja cars. This style CVT s really cool because it has passive controls that basically shift it into a lower "gear" as there is a higher torque request. This is accomplished by a cam style spring loaded clamping mechanism on the sheaves (pulleys).

Best of luck. Also, There is a really interesting way of running a CVT with a differential like arrangement in such a manner as to create a geared or locked neutral.

[yongkimleng]

With the vex differential gears and 2 motors, you can have one motor drive the outer gear and another driving one of the left or right axles.

The only thing I'm wondering is, unlike those CVT (e.g. the belt drive one), at lower speeds is basically one motor reducing the rpm of the output shaft since the primary motor is always spinning at full speed. Does this really create more torque?