Suspension MUni



P

Pete66

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Checkout my cool full suspension MUni, hands up who
wants one?

cheers Pete

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sweet lord that is an awesome muni.

**raises hand**

-grant

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.. PS Please don't sue me Kris, I know its got ur sig on it
but um, yeah.

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Thats really cool Pete!

When I clicked on the thread I thought it was going to be
another person asking if you can get suspension unicycle...
but I was pleasently suprised with your pic! :D

Joe,

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Wow! Nice!

The problem is that the spoke force is tensional, not
compressional. So mabey if the piston shafts were flexible
and had a pulling shock absorbtion, it'd work. The biggest
problem is the rim's not strong enough to handle most muni
riding. It'd taco on the first hop.

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army can get you a Medal, while playing with one can get you thrown out?
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GizmoDuck wrote:
> *Any engineers out there able to comment? *

Agreed, Pete that's an awesome graphic. VERY nice work!!

From an engineering sense there would need to be hinges at
the hub end of the pistons. Assuming the rim was strong
enough to hold together as a semi-rigid hoop (heavy, but
possible), then think of what happens when you squish the
wheel down. The bottom spoke compresses, which is fine, but
the upper two spokes aren't pointed in the right direction
so they can't. If the upper two shocks can't pivot at the
hub then the pistons will jamb sideways in the cylinders.

Ok, so let's imagine that the hub ends of the rockshocks are
pivoted. Now it has beautiful suspension action. Sure, the
rim has to deform a bit, but there's a lot of room for
deformation so it could be done without any catastrophic
failures. What happens when you pedal?

If the hub ends of the rockshocks are hinged freely then the
hub can spin a bit within the wheel. If it's really free
then the hub could rotate 30-40 degrees in either direction
without sending any torque to the rim. This would be really
bad. The unicycle would not be ridable. So purely free
action is out too.

There might be a way to compromise. Perhaps use hard rubber
bumpers on either side of the hub hinges so that the spokes
don't rotate around the hub very freely.

As Edison said, invention is 1% inspiration and 99%
perspiration. Most people don't ever get to the 1% bit.
Pete, you're well past that part. Keep at it and you'll get
to a ridable machine. Once you do can I take it for a ride?

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cyberbellum - Level 1.0 rider!

Optimists think the glass is half full. Pesimists think the glass is
half empty. Engineers think the glass is too big.
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Would more shocks help the strength issue? How about welding
"spokes" that go across the diameter of the wheel without
hitting the hub? I don't know to much about the physics of
this, but it looks like a real cool idea.

Daniel

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I like the idea, very novel. I designed a couple of
unicycles to isolate the wheel from the cranks a year or two
ago. They only ever made as far as the back of an envelope,
not on to CAD and certainly not into prototyping. It all
started to get a bit complicated.

Anyone remeber the Tioga (IIRC) disc wheel that was laced up
with kevlar string (again IIRC) to give a form of
suspension? This design reminds a bit of that. Might go and
look it up.

Nick

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Hey Pete, good idea!

It's cool to see that I'm not the only one who want to push
the limits of the MUni designs.

I'm a student in mechanical engeneering, and I had a
conception project about a fully suspended unicycle.

The design I came up with (after more than 10 other models),
is way more complicated than yours. But one of the rejected
design was similar: instead of the RockShocks, it had curved
metal plates (like a trailer suspension) disposed as spokes.

We will soon be producing a prototype out of the final
design. Since nothing is machined yet, I don't want to show
the complete 3D model. But you will certainly hear of it
when it's done and after we had tested it severely.

Here's an overview about what we started with:

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vincelemay - Quebec unicyclist
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(Sorry for the crappy link, this is what I meant)

SUSPENDED UNICYCLE PROJECT

INTRODUCTION : The project was designed to improve the
mountain unicycles used in very technical and rough
terrains. For the first prototype, we are going produce it
from basic steel. If the feeling of the design is good and
we want to continue with the idea, we are going to make
another prototype correcting the possible mistakes made on
the first one and make it from chromo and aluminium.

PRINCIPAL OBJECTIVES : The proposed solution should be
adapted for downhill utilisation. The suspension system
should help to gain control and stability, which is
necessary for that type of practice, and by the way reduce
fatigue a little. The solution should be light enough and
resist to the conditions met in unicycle downhill.

ESSENTIALS CONDITIONS :

The proposed solution should: ·have a suspension system,
adjustable from 3 to 7 inches ·permit the use of some
standard parts: -26’’ wheel with a 3’’ wide tire -6’’ disc
brake conformed to the SI standard -27.2mm seat post -
Profile crank arms -Standard bicycle shock ·resist to the
abuse of a 190 pounds load from a 12 feet drop ·resist to
impacts inherent from the practice ·not weight more than 25
pounds for the total assembly ·reduce the effects of
pedaling on the shock ·permit to the distance between the
saddle and the cranks axle to not be affected by the
suspension ·permit the alignment between the saddle, the
axle and the wheel to be the most constant possible trough
the suspension path ·permit the propulsion to work like a
standard unicycle, without play between forward and backward
·permit saddle height adjustment from 21 to 27.5 inches
(from the axle to the top of the saddle) ·not cost more than
2000 CAN$ in material ·have to lowest profile possible

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vincelemay - Quebec unicyclist
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In article
<[email protected]>,
johnfoss <[email protected]>
wrote: ) )The obvious challenge is to make something that
will allow the wheel to )deflect, or deform, without
weighing a ton, and while not interfering )with the
transmission of drive force to both turn and stop the wheel.

What about in the hub? You could start with a design like
Blue Shift's hub, and instead of having gears in between
the central axle and the secondary (spoke flange) axle,
you could have small piston-type shock absorbers. If you
ran them fairly tight, they wouldn't affect handling too
much. -Tom
 
On Tue, 18 May 2004 19:38:00 -0500, "aust" wrote:

>would it not be hard to hop?!

Maybe, because of the weight. But the springiness of the
wheel would be beneficial to hopping.

Klaas Bil - Newsgroup Addict
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That was a great graphic. Too bad the concept doesn't work,
because if the suspension can be in the wheel, the rider has
a chance of having his feet, not just his butt, isolated
from the bumps of the trail. That should be the goal of a
suspension system for MUni.

The obvious challenge is to make something that will allow
the wheel to deflect, or deform, without weighing a ton, and
while not interfering with the transmission of drive force
to both turn and stop the wheel.

Sorry, I don't have any bright ideas at the moment...

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John Foss, the Uni-Cyclone
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