>Hi, Craig! 25 mm belts are popular, and big enough for the common
>electric boat motors. McMaster-Carr has a good selection of pulleys
>and hubs. I think Thunderstruck has a belt reduction unit ready
>made, using a flat timing belt. I found a thrust bearing at Glenn-L.
>Really, the only good reason I can see for using multiple vee belts
>is you can easily find replacements just about anywhere. The flat
>belts are clearly more efficient.
---
A flat belt and a timing belt, at least as I understand the
definitions, are two different things. Poly-V belts are also pretty
flat and quite different from common V belts.
Something I like about flat belts, and perhaps poly-V belts, but
unlike toothed belts, is that you can let them slip to have a clutch.
That's probably not so useful on a boat, but I could see doing a car
transmission using 99% efficient flat belts (or poly-V belts) instead
of a bunch of whirring gears in thick oil, that lose 30% of the power.
My idea would be two shafts, input and output, with a different sized
pulley set for each 'gear'. The belts would be just stiff enough to
expand into ovals that don't touch the pulleys until pushed into them
with an idler pulley for each gear.
I should think 2 or 3 sets of pulleys and belts ('gears') would make
a great electric car transmission that would go much farther (even
50%) on the same batteries than is typical. (Reverse might need an
idler on the other side from the forward couplings, even tho the
motor direction would also be reversed to go backward.)
Craig
Posted by: Craig Carmichael <craig@saers.com>
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