rec.sport.unicycling · Public discussion

Pedals on Axle geared Uni

e39m5 · 2005-05-21T17:08:06+00:00

Has this been made? I just had a thought... If you use a bike hub, it has a gear attached to it, and an axle going through the middle. Say Attached to that axle you had another gear, and cranks. Use a fork setup sort of like 'this' (http://tinyurl.com/drfls) Instead of cranks coming out up high on the fork, have a gear. _ _ Gear --> |_|---|_| | U | |_|---|_|--- ^ ^ ^ A G W x E H L A E E R E L H U B The fork goes down through the hub and axle. The cranks would be to the left of the far left gear. The cranks on the main axle would make it better for hopping, I think. e39m5 -- e39m5 ------------------------------------------------------------------------ e39m5's Profile: http://www.unicyclist.com/profile/9836 View this thread: http://www.unicyclist.com/thread/40570

Started by e39m5 · 21 May 2005 · Last activity 24 May 2005 · 14 posts · 226 views

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01 / Original postPedals on Axle geared Unie39m5 · 21 May 2005 02 / This pagePosts 1–14Page 1 of 1 · chronological order 03 / Latest replyPost #14unisk8r · 24 May 2005

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Original section: rec.sport.unicycling
Published: 21 May 2005
Last activity: 24 May 2005
Original author: e39m5
Posts: 14
Discussion status: Public discussion
Total views: 226
Views / 30 days: 0

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Original post
e39m5
Archived post

21 May 2005, 17:08 UTC #1

Has this been made? I just had a thought...
If you use a bike hub, it has a gear attached to it, and an axle going
through the middle. Say Attached to that axle you had another gear, and
cranks. Use a fork setup sort of like 'this' (http://tinyurl.com/drfls)
Instead of cranks coming out up high on the fork, have a gear.
_ _
Gear --> |_|---|_| <-- Gear
| ^ |
| H |
Chain --> | U | <-- Chain
| B |
| |
Gear --> |_|---|_|---
^ ^ ^
A G W
x E H
L A E
E R E
L
H
U
B
The fork goes down through the hub and axle. The cranks would be to the
left of the far left gear. The cranks on the main axle would make it
better for hopping, I think.
e39m5
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e39m5
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e39m5
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21 May 2005, 17:16 UTC #2

does this idea atleast make sense to you? If not im might try and build
it out of knex. It's hard to explain.
e39m5
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Chrashing
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21 May 2005, 18:08 UTC #3

'Isn't Purple Phaze an improvement on that design. '
(http://tinyurl.com/dr4cg)
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S_Wallis
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21 May 2005, 18:24 UTC #4

Purple Phaze is now called "Outta Phaze" and available through LiveWire
unicycles. 'LiveWire' (http://www.livewireunicycles.com/)
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S_Wallis - MUni Motivated
"I am always doing that which I can not do, in order that I may learn
how to do it." Pablo Picasso
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e39m5
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21 May 2005, 18:29 UTC #5

It actually seems to be the same design I was thinking about. I just
had nother thought. Say both sides of the wheel were geared. However,
they were geared differently and you could somehow engage and disengage
the gears attached to the crank or hub. Possibly a 2-Speed Unicycle.
e39m5
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S_Wallis
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21 May 2005, 18:32 UTC #6

There have been many threads on geared unicycles. A search will give
you much reading material.
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S_Wallis - MUni Motivated
"I am always doing that which I can not do, in order that I may learn
how to do it." Pablo Picasso
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john_childs
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21 May 2005, 23:12 UTC #7

e39m5 said:
*It actually seems to be the same design I was thinking about. I just
had nother thought. Say both sides of the wheel were geared.
However, they were geared differently and you could somehow engage and
disengage the gears attached to the crank or hub. Possibly a 2-Speed
Unicycle.
e39m5 *
Now that's a thought. It could work. It would certainly complicate the
design which adds cost. Figuring out how to securely lock one side
while letting the other side run free would be tricky while still
allowing it to shift. I don't see it being able to shift on the fly,
but being able to manually move a few locking pins around to shift to
the other gear would be cool.
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e39m5
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21 May 2005, 23:59 UTC #8

Has anyone ever heard of a way to disengage a gear from an axle?
e39m5
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e39m5
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22 May 2005, 00:32 UTC #9

schlumpf is all internal, right? Im trying to think of a way to do it
like a clutch in a car. But im not sure exactly how they work. Theres
a way to do everything, or almost everyhing, but how do we do this.
e39m5
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john_childs
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22 May 2005, 01:24 UTC #10

The Schlumpf is internal, but the same idea could be applied to a gear
external to the hub. It's six or so dowels or pins that engage holes in
a ring. Have the dowels engage an external cog or cog supporting
structure and you could engage and disengage a cog gear. So there are
ways to do it that should theoretically work.
The problem with most clutches is that they tend to work on friction so
they allow some slippage. You don't want slippage in a unicycle
drivetrain.
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unisk8r
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24 May 2005, 17:22 UTC #11

e39m5 said:
*So... Both jackshafts will always be spinning, but only one will be
drving the hub. Did I get that part right?*
Yup.
Quoted message said:
*You seem to have a pretty good understanding on how you would change
gears, but I didn't really understand it. Some questions:
When the left jackshaft is driving, what gear on the right is
disengaged? Well it be the same the other way around?*
The disengagement of the lower gear ratio automatically occurs when the
higher gear kicks in. Once the higher gear begins driving the hub, the
lower gear side will freewheel, because the hub is now spinning faster
than the low gear ratio itself.
Quoted message said:
*How would a couple a pin stand up to the forces on the unicycle?*
Think 1/4" steel plugs. Or a miniature clutch drive in the jackshaft
itself. The forces on the drivetrain are alf that of direct drive,
because the power is transmitted through 2 halves (sides) of each
jackshaft.
I'd love to work more on this, but ideas for a multi-speed shiftable
drivetrain are jellin'...
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S_Wallis
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24 May 2005, 17:30 UTC #12

Klaas Bil said:
*On Sat said:
Purple Phaze is now called "Outta Phaze" and available through

LiveWire
Quoted message said:
unicycles. 'LiveWire' (http://www.livewireunicycles.com/)
Isn't rather "Purple Phaze" the original prototype and "Outta Phaze"
the production model based on it?
Klaas Bil - Newsgroup Addict
--
wouldnt you be grumpy if somone just said you had PMS? - jagur *

Yes, your wording is much more accurate than mine.
I meant that the concept was renamed, not the unicycle itself.
Following the link made it clear, but thanks for pointing out my
mistake. I will return the favor if you ever make one.😉
Scott
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how to do it." Pablo Picasso
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john_childs
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24 May 2005, 20:58 UTC #13

unisk8r said:
*The disengagement of the lower gear ratio automatically occurs when
the higher gear kicks in. Once the higher gear begins driving the
hub, the lower gear side will freewheel, because the hub is now
spinning faster than the low gear ratio itself. *
What would happen if you tried to pedal backwards or roll the unicycle
backwards to get the pedals into position for mounting? Granted, you
don't pedal a Coker backwards much. But everyone does it a little bit
at least occasionally.
The double sided jackshaft with two different gear ratios is probably
the most promising way of getting two different gear ratios to work on
that style of unicycle. Trying to figure out how to engage and
disengage each side is the tricky part. And then the issue that you'll
probably need a custom machined hub.
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unisk8r
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24 May 2005, 22:49 UTC #14

What would we do without you, JC?
I should have left this thread alone after Chrashing's auspicious post!
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