Re: Re:
ScienceIsCool said:
When people say hub, they always think of the shell between the flanges. But there's a relatively big volume occupied by the freehub mechanism... I'd be shocked if a three person team couldn't have a functioning prototype in 6 months. This is something a university student team could do as a school project.
John Swanson
Ok, it's time we put our money where our mouths are.
I found a cross section of a Shimano rear hub from som patent link, scaled it to the known width (130mm) and went to work.
I figured you
need a quick release. I reduced it to 4mm from the standard 5.
The axle OD I set at 8mm,
maybe 7 would work too.
For the hub shell I figured 1mm wall thickness is not impossible, same as 0.5 air gap betweeb hub shell and rotor.
Wheel bearings are spread out as far as possible in the model.
The free hub doesn't need bearings, it can just slide on the hubshell. Mind you, there is no clutch yet.
I put a rotor with 1mm shell thickness on the axle/stator.
Do you see how the cage and windings would fit on the axle while the rotor holds the magnets on the inside?
No matter how rare your magnets are , it's very far from 'easy'.
And how would you route the power leads to the inside of the rotor+bearings?
What about the 1:30 gear box, is that doable too? It must use two stages, no?
Got an idea for a fully functional freehub clutch that fits in within the standard Shimano profile but doesn't steal space from the motor?
How would you make sure this mechanical masterpiece
never breaks down in a public, sensational way?
Maybe you envisoned something completely different. Looking like a standard racing wheel hub of course.
Your call.