pic: CVT drivetrain

[mechanicalbrain]

actually i planned to gear it not run it based on friction

[sanddrag]

The problem with gears in CVTs is that with a varying diameter comes either one of two things:

A varying pitch, or
A varying number of teeth

And I don't see how either circumstances could properly mesh with another gear. That's why I've never seen an actual cone shaped gear and that is why most CVTs are friction based.

The only thing I've seen that is close to being a mechanical CVT was the ThunderChickens CCT which used a motor to drive the ring gear of the planetary as well as the sun.

[santosh]

How would that work. I am very curious. I would love to know.
edit: in reference to mechanicalbrain's gearing and not friction

[mechanicalbrain]

well if you gear it (and i admit the gears would need i bit of slop) correctly the sides will still be able to slide though i couldnt use servos without gearing them. actualy the im positive that if you gear all four of the gears (agian with a little slop) they would rotate perfectly and still slide. to test this im making some oversized wood ones. the concept isnt that impossible and i was believe imployed in some cars or at least that is what im told. to clarify the picture is misleading in that in not tapering that much. admitedly theres some math. it also helps to have fine teeth on the movine gears.

[mechanicalbrain]

actually now that i think about it both the moving and not moving parts can have the similar change of gears teeth spacing and as you rotate a different spacing is used because a different area touches. its difficult but entirely possible. the trick is to have the least possible area of contact.

[mechanicalbrain]

or inversely geared teeth would definiteley work but im not sure how it would change the gear ratio.

[santosh]

I know for a fact that the new Nissan Murano uses cones. I am not sure baout other stuff though. Wow you are right. But when you swivel now that I think of it, the entire thing changes. and screws up. I think?

[santosh]

Um, I dont think that would work either. Get on aim an maybe we can discuss this some.

[mechanicalbrain]

allright i could half gear it half use friction or i could go all out and do friction with a material like rubber of course i would have to pick the right type.

[mechanicalbrain]

by the way id love to AIM you but im having trouble with CDs set up if anyone could tell me what to do.