I have been looking at Continuously Variable Transmissions, CVT(s) and Infinitely Variable Transmission IVT(s) for a few days and decided to make myself one.
i will walk you through the key parts so you can do it too(please give constructive comments about anything in this instructable...especially about the usage of terms)
This is a plate and wheel model, basically the IVT part works by moving the wheel nearer or further from the center of the plate. The nearer a point is to the center of the plate, the slower it moves and thus turns the wheel slower but with more torque. The CVT part is the fly wheel which "contracts" along its axis when spun and thus, moving the wheel further from the center of the plate.
due to some unknown problems, i am unable to add photo notes or embed my video, please bare with me while i try and fix this problem
oh, by the way, i am in the 13-18 category.
Alright, as pointed out by fellow user jj.inc:
"Actually, just for informational purpose, this is a CVT only, not an IVT. An IVT can output at such a low gear that there is no output at all. A ∞:0 ratio is not possible with this device, so it is a CVT which from ratio A:X to ratio B:X where X ≠ 0 can have infinite variance."
learn more about CVT and IVT by just google-ing it
http://en.wikipedia.org/wiki/Continuously_variable_transmission
http://auto.howstuffworks.com/cvt.htm
Remove these ads by
Signing UpStep 1: Plate and wheel assembly
Just attach a CD or any disc you are willing to sacrifice to the Lego parts ensuring that the lego axis is dead center.
i use wheels with tires to get a good grip on the CD, it might be better to make holes in the CD for the Legos to attach better
next you would want to get a wheel with its tire as the driven wheel, make sure you use one with good grip, the bigger the wheel you use(diameter) the slower it goes, but with more torque
i use wheels with tires to get a good grip on the CD, it might be better to make holes in the CD for the Legos to attach better
next you would want to get a wheel with its tire as the driven wheel, make sure you use one with good grip, the bigger the wheel you use(diameter) the slower it goes, but with more torque
Visit Our Store »
Go Pro Today »
One note: When writing documentation you should never assume all readers will know what your acronyms mean. So, it is common, the first time it is used, to define all acronyms or jargon thus: CVT (constant velocity transmission).
In many cases you may even include a link to, for instance, a WIKI page where it is defined in more detail.
Cool project.
the balancing wheel does not affect the function of device its there to...well balance it
Thanks for the info (^.^)
hmm.. never really thought of it as a teaching aid, but i think its kind of suitable since students would be able to see, hear and feel the system at work
anyway, its a transmission system to vary torque output based on the angular velocity of the output shaft
simply put its like a gearbox where when the wheel is near to the middle of the CD it spins slower but is more powerful, when it is towards the rim it spins faster but is less powerful, (powerful as in harder to stop or better ability to overcome resistance)