Multi Speed Friction Drive (Idea)

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bird_e

New Member
May 4, 2010
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Boulder, Co
I have been thinking about a multi-speed friction drive and have an idea (half baked) but let me know if you think this is feasible.

If your were to take a internal geared multispeed rear hub and mount the hub as the friction roller itself and drive it from it's sprocket as you change gears the friction roller would change its ratio. It seems too simple...

A couple of questions come to mind, such as rotation... Do these hub rotate the correct direction for FD? Can you change it if not? Can you flip it around to make it work? Can these hubs work at such a high RPM?

hmmm.....
Bob
 
Fulltimer

Fulltimer

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Aug 13, 2010
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A multispeed friction drive sounds really good. Will it work? I have NO idea. If you don't mind laying up a bike for awhile I say go for it. If it doesn't work right, try again in a different way. Whats to lose? Maybe lots to gain!

Terry
 
Dan

Dan

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May 25, 2008
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Purty awesome Bob! I really, really like it!

Folks have used them as part of their reduction so I think there is great hope for this.

I was planning a FD build just after 2 other projects so with your permission, would like to try it as well.

I had wanted to make it so it "pop" started. I wonder if they could be made to not freewheel? Well, any thing can be done.

Really is a great idea.

I am thinking drill out a rubber boat roller as a roller....



.flg.
 
B

bird_e

New Member
May 4, 2010
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Boulder, Co
I believe there are some "fixed" gear internal geared hubs. That should allow it to turn in any direction with no free wheel
 
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happyvalley

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Jul 24, 2008
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The idea has been floated before, among several issues of concern I think the main one is whether a stock component made to turn several hundred rpms will hold up to several thousand.

On the other, fixed gear bikes by nature are one speed.
 
Dan

Dan

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May 25, 2008
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After much drinking about this, er I mean thinking, what I'm planning is a saddle mounted Honda GX50 (secured to the seat and chain stay) with a Maxtourq or equivalent cen clutch. As this is more an experiment and proof of concept. That, and I can't figure out if the ratio will work well. Just gonna throw it together an' see.

Whats the worst that could happen? Snork
 
pocdragon

pocdragon

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Apr 30, 2011
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RI
those hubs cost alot if u want a new one

a second hand one might not be in the best shape and already has been worn

i heard that between gear when you change up or down you can shred the teeth if your not carfull with the throttle

i would strip off the spokes and jbweld some sand on the hub itself

i would nix the clutch and chain and attach it right to the crank of a 25-50cc 2stroke wasp setup

if i had one i would use a 4 speed
2 under drives. a 1-1, and one over drive

again cost would be the only issue, im sure theres a learning curve so u can change up and down without ruining the hub

if i had a bike with a multispeed hub layin around id try it, but there pretty hard to find cheap

goodluck all id like to see this in action.cs.
 
Dan

Dan

Staff
May 25, 2008
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Moosylvania
I have yet to try a boat trailer roller so is all academic as yet. But my thinking is it having more contact with the tire, will have better purchase. Being of a similar material, will cause less tire wear. Waiting for a pic to go threw. LOL, my thinking on going with a $25 a month cell phone plan was good too. The phone is connected to this laptop to charge but I have to email the pic to myself, then upload to photobucket to post. "Shin-dow-goo" is Japanese for "Demented machine" but implies a devise meant to make life easier but comes with it's own host of problems. Cracks me up and perfectly describes our thing.

But any way, what'a ya think Terry? Is 2.5" in the center and wraps around ballon tires like it was made to. Costs $5 new but can find a ton of them at scrap yards.

 
5

5-7HEAVEN

Well-Known Member
Aug 2, 2008
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bird_e said:
I have been thinking about a multi-speed friction drive and have an idea (half baked) but let me know if you think this is feasible.

If your were to take a internal geared multispeed rear hub and mount the hub as the friction roller itself and drive it from it's sprocket as you change gears the friction roller would change its ratio. It seems too simple...

A couple of questions come to mind, such as rotation... Do these hub rotate the correct direction for FD? Can you change it if not? Can you flip it around to make it work? Can these hubs work at such a high RPM?

hmmm.....
Bob
Click to expand...
Man, that's an AWESOME idea!dance1

Since the hub turns clockwise, its sprocket would have to be on the left(opposite) side. I believe a modified BMP gear/belt drive kit MIGHT work well with the internal hub. The engine mounts ahead, with centrifugal clutch, BMP shaft/axle and 10-tooth sprocket. This chains to the internal hub's sprocket. A two-piece rubber or steel sleeve bolted onto the internal hub would roll onto the tire.

The hub's spoked attachments might have to be machined off to clear the BMP drive housing.

What an inspirational project! If you could run it through gears instead of friction roller, it'd be a FANTASTIC invention!xct2
 
SJN

SJN

New Member
Feb 9, 2011
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Pinon Hills, CA
Way cool idea! Just use a simple lack shaft to keep the rotation correct and if memory still works you may be able to do away with the free wheel with a well placed weld. That said its been like 25 years since I had one apart. Lol
 
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