From Concept to Prototype: Ultra-Light Ebike Kit for Road Bikes Now in Development!

[Katrina92]

Yes.

The Fazua, as I read it, puts out 1.9N at its output shaft, and that motor is much longer than a 135 mm dropout on a typical bike. It multiplies that with a gear that turns the pedal axles, with further increases thru the derailleur.

Your concept drawing show a motor not much wider in diameter than a hub, around the size of a Fazua. Give it it a 1 nm output for being half as long. I'm no mechanical engineer, but seems to me it's going to need some innovative gear design to even get 5X multiplication.

To get more torque out of something this small, we need a higher reduction ratio.
We're trying out different ideas and building a demo to test it out and see how it feel.

 

[Katrina92]

The drive unit off an electric drill, two planetary gear reductions...bit whiny thought

That's also what we worry about: the noise with the multi-stage gears.
We need to confirm that.

 

[Mr. Coffee]

I suspect you wouldn't need a torque arm if your conversion has a through axle. And if you did it would look really different than conventional torque arms. Also, it is 2025 not 1975 and the way you attach a wheel to a bicycle is with a through axle.

 

[Base]

Non turn washer in frame

reaction force arm

 

[Base]

I suspect you wouldn't need a torque arm if your conversion has a through axle. And if you did it would look really different than conventional torque arms. Also, it is 2025 not 1975 and the way you attach a wheel to a bicycle is with a through axle.

wel, i've seen a few cases on spinning axles with TA's...

 

[Chargeride]

Ive never spun an axle, even on cheap alloy frames with 2.5kw power, riding hard offroad using torque washers.
I used homemade arms for peace of mind, but it was fine without.

 

[Mr. Coffee]

The purpose of a torque arm is to keep the axle from rotating out of the dropout.

With a through axle you don't have a dropout. You have a threaded hole the axle goes into. And it is threaded so that even friction from the wheel rotating in a forward direction will tighten the axle, not loosen it. You'd only loosen it if it weren't properly greased and you were riding the bicycle in reverse a considerable distance.

 

[Base]

The purpose of a torque arm is to keep the axle from rotating out of the dropout.

With a through axle you don't have a dropout. You have a threaded hole the axle goes into. And it is threaded so that even friction from the wheel rotating in a forward direction will tighten the axle, not loosen it. You'd only loosen it if it weren't properly greased and you were riding the bicycle in reverse a considerable distance.

In theorie Indeed.