Freeride hub (infinitely variable gearing)

it'll be interesting only if we can get rid of freewheel (that is the
gearing work both ways).
I have asked another hub builder if we could get rid of the freewheel
and answer was "no way".
I would like to see the general principle of this hub (how the
continuous gearing is working)

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Good point. I forgot about the "built-in" freewheel. Oh well.

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kokomojuggler said:

Still, variable gearing would be very nice.

Yes, continuously variable gearing on a unicycle would be very nice.
It's the Holly Grail of gearing designs.

A jump in gear ratios is difficult to handle on a unicycle. The sudden
jump from 1:1 to 1:1.5 or from 1:1.5 down to 1:1 is challenging to
adapt to. A continuously variable shift would be much easier to handle
on a unicycle.

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Yet another thread on my all-time fav topic!

The best promising technology is the NuVinci bike hub:
http://www.fallbrooktech.com/03_Bicycle.asp

The internals can shift in any parameter, forward, backward and even
stopped. It goes from 1:1 to 3.5:1, a very healthy span of gear ratios.
The design is essentially already a fixed gear, but there are two
roadblocks.

In its current state there is no way to attach a fixed cog. But this is
minor.

The biggest design issue is that the shifting mechanism requires a
cable running into the axle, such that any unicycle application would
have to have the cable running out not only through the axle but
through the cranks as well, and you'd be pedalling inside of the cable
loop. If we could rig it up for a uni axle, I could live with that.

Someone would have to purchase a unit, dissassemble it, and fabricate a
whole new axle system. But the guts of the design are there and
working.

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The Freeride hub is by 'Nupace' (http://nupace.com/). I'm not sure if
it is based on the Fallbrook design used in the NuVinci hub or not.

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unisk8r said:

The biggest design issue is that the shifting mechanism requires a
cable running into the axle, such that any unicycle application would
have to have the cable running out not only through the axle but
through the cranks as well, and you'd be pedalling inside of the cable
loop. If we could rig it up for a uni axle, I could live with that.

Well, how about linking the cable to the hub at the bearing holder
(i.e. inside your legs) and using a rotating joint to account for the
movement of the axle? e.g. something like the rotor head that allows
BMX handlebars to spin 360 whilst being connected to the rear brake.

I've also seen bicycle hub brakes that appear to have the cable not
coming directly out from the axle, so something like this must already
exist in some hub designs out there.

Personally, I'd think a cable shift mechanism like this could be quite
appealing for existing style geared hubs too; you can then keep your
feet more firmly planted whilst shifting.

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the hub that was the orignial reason for this pot appears to have a
collar around a shaft on the axle which is rotated by acbles, you can
see details towards the bottom of that page. This could be neatly
tucked inside the frame, or between the frame and the hub

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Note the 10mm axle on NuPace hubs. Not friendly to a unicycle hacker.

It's another interesting design, for sure, but you'd still have to
re-fabricate the whole hub to even attempt a fixed-gear version.

Someone have an angel to finance the fabrication of a radio controlled
servo-shifting NuVinci with a redesigned axle?

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It would be really interesting to fabricate something similar for
unicycle usage. I just saw this one the popular science website:
http://tinyurl.com/3xy8b2

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I've had a look at the duvinci hub and the specification says it has a
range of0.5 underdrive to 1.75 overdrive.on a 26" unicycle that would
give you the equivelant of 13" wheel through to a 45.5" wheel surely
enough to satisfy anyone.To be adapted for a unicycle you would have to
replace the axle with a hardened crank axle shaft,the input has to be
driven by the crank shaft and the gear ratio changer mechanism would
have to be re-engineered to exit inboard of the the crank ends.Without
having seen one of these hubs in the flesh I doubt it would be possible
to carry out these mods however if they decide to cater to unicycles
I'm sure they could produce a unicycle version without too much
trouble.I want one.

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my only question when it comes to the nuvinci hub is: can we get rid of
free wheel?
if ok then I think we can do something with it without many changes.

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here is what I had in mind: based on Pete Peron's initial idea except
that the chains are on each side of the frame and that the secondary
axle is further off.
In that case a slightly modified CVT could be used provided that the
free-wheel is off.
for sure it is not _that_ simple but this sketch is to illustrate the
general idea I had had in mind for 2 years (but unable to find someone
to build a model - a model because I suspect there are some problems
with this design-).

+-------------------------------------------------------------------+
|Filename: geared_build2.jpg |
|Download: http://www.unicyclist.com/attachment/24492 |
+-------------------------------------------------------------------+

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wobbling bear the freewheel on the duvinci hub is part of the sprocket
carrier like you would find on a derailier type hub so that is easily
solved.your design will work but the more components you use the
heavier and more complex it becomes also chain drive should be avoided
if possible due to maintainance issues.

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dangerdog said:

your design will work but the more components you use the heavier and
more complex it becomes also chain drive should be avoided if possible
due to maintainance issues.

yep but what I want is a XC machine to dash through forrest trails (not
for trialsy things) ... So I will be ready to accept the weight penalty
(and get ready to fix chains again and again). I am more worried about
influence of gear change on balance.

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wobbling bear said:

here is what I had in mind: based on Pete Peron's initial idea except
that the chains are on each side of the frame and that the secondary
axle is further off.
In that case a slightly modified CVT could be used provided that the
free-wheel is off.
for sure it is not _that_ simple but this sketch is to illustrate the
general idea I had had in mind for 2 years (but unable to find someone
to build a model - a model because I suspect there are some problems
with this design-).

It weighs 4kg, which at that offset would be horrible. Surely it'd make
more sense to have it in between the legs of the frame, above the
wheel? Assuming you're thinking a 26" wheel, there'd be loads of room
if you used a 36" frame.

Joe

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joemarshall said:

It weighs 4kg, which at that offset would be horrible. Surely it'd make
more sense to have it in between the legs of the frame, above the
wheel? Assuming you're thinking a 26" wheel, there'd be loads of room
if you used a 36" frame.

you mean the CVT weighs 4 kg!!!? (I was not aware of that 🙁 )
Without this consideration there is a reason why I wanted to experiment
with a different location: I am afraid of balance problems if the
secondary axle is vertically aligned with the main axle ... But I may
be completely wrong!
you are right I am thinking of a 26" wheel. So brainstorming and
experiments are welcome!

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wobbling bear said:

you mean the CVT weighs 4 kg!!!? (I was not aware of that 🙁 )
Without this consideration there is a reason why I wanted to experiment
with a different location: I am afraid of balance problems if the
secondary axle is vertically aligned with the main axle ... But I may
be completely wrong!
you are right I am thinking of a 26" wheel. So brainstorming and
experiments are welcome!

Weight from
http://www.fallbrooktech.com/NuVinci_Experience.pdf

It's much easier to balance with a heavy weight on the line of the
frame than if you have a weight off axis, or at least it is if it's
luggage strapped to the unicycle, I'd assume the same to be true for
this.

Joe

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I see ... IMHO 4kg is too much for a CVT on a unicycle. (that makes at
least a 11kg unicycle ... well My Old fashioned Coker weighs around
that ... but ....)
other options?

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wobbling bear, the freewheel is screwed onto the NuVinci hub. The hub
itself is already set up for fixed gear apps, and can operate in both
directions.

dangerdog, the necessary axle mods are more complex than appear. If it
were possible, this hub would have been modded for unis by now.

But it is possible. All I said earlier was that it will take resources
(money & metal) to modify the existing design.

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