Belt drive & other gear reduction for 2kW electric motor

[trappy]

Hi Guys,

First of all, this thread is probably off-topic. As a regular RCG poster, however, I couldn't think of a better place to turn to. Please feel free to delete the post if I'm crossing lines ...

I've been toying with the idea of mounting a 2kW (480kV) motor on my bike. There are some really cheap motors + 80A HV ESCs available on ebay for about $100. The main criteria is to keep it cheap. That's why I'd like to keep the construction as simple as possible.

After some initial calculations, I'd need roughly 1:25 gear reduction. I can get about 1:5 gear reduction by using standard bike components (11 teeth and 53 teeth are the largest/smallest in the bike shops). This means I'd need an additional 1:5 reduction driving the 11-teeth "wheel". I've been looking around the web for a good way how to do this and have found belt drives and "gear wheels" - most of which are catered towards the 400 class motors or smaller.

Planetary gearboxes are out of the question as they would cost far too much.

Have any of you guys got experience with belt drives or gear wheels for this type of power?

- trappy

[Jeffery]

Check here

http://www.wisil.recumbents.com/wisil/shumaker/default.htm

[trappy]

Thanks a lot Jeffery. I read through the whole thread of Matt and while reading I began to feel more and more worried that I'd be getting over my head: the systems that I found on the web are <500W, naturally they are a lot simpler in construction. It's really nice to see that he will be making kits available by spring. Thank you so much for that link - I have no idea how that slipped my endless evenings of googling on the topic!