Hi,
So today my boss and my self got in a debate about a design for a powersplit. We have been working on hybrids for a while, and talk about powersplit designs often. One thing that comes up is doing the powersplit with belts, instead of a planetary gearset as normaly used in vehicles such as the toyota prius.
This basicly comes from something in one of his old text books saying you could build a device the same as a planetary but with a system of belts. But it doesn't show how it's done or give any pictures or equations. Just says it can be done. In the vehicles we have built so far (no powersplits yet) we have used Gates Syncronous Belts for various parts of the drive line since they are simple, durably, no need for oiling and so forth. Plus cheap to do on a prototype or a one off like University Built hybrids. So to be able to do a simple powersplit with belts would be great.
I have looked all over the net but have yet to find anything about such a device. It might be out there, but I don't know what to call it. So I was wondering If anyone here knows of such a device, basicly a drawing(s) and the equations for it.
We have a design (as in a markerboard of sketches) we belive works, but there is still some debate if it would work. Neither of us has had time to work it out. But apparently there is a way to do this. I can come up with a description of what we have if no one has any info at all. I would think if it's possible some where there must be some info on doing this. But then again trying to find info on doing a powersplit with a planetary is kinda hard since most things only use planetary gear sets for speed reducers, not 2 DOF systems.
Thanks for any links or help.
Brad