Innovative Hubless Motorcycle Design Unveiled
#23
01-17-2008, 09:53 AM
Road Warrior
RE: Innovative Hubless Motorcycle Design Unveiled
Amen's Hubless Monster
#25
01-17-2008, 10:15 AM
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RE: The hubless wheel was invented by Franco Sbarro
ORIGINAL: FastHarley
The hubless wheel was invented by Franco Sbarro, who has built a variety of working hubless wheel vehicles including at least two motorcycles, and patented by Globeholding of Geneva. I have seen this design in the Geneva Car show. This guy was developing a 3 wheeled transpotation enclosed trike. I believe it was in the 80's.
The hubless wheel was invented by Franco Sbarro, who has built a variety of working hubless wheel vehicles including at least two motorcycles, and patented by Globeholding of Geneva. I have seen this design in the Geneva Car show. This guy was developing a 3 wheeled transpotation enclosed trike. I believe it was in the 80's.
Thanks, I couldn't remember the name, and he's Italian...
If I remember correctly, Sbarro not only came up with the hubless wheel, he also came up with the hydraulic drive concept which disposed of the need of a shaft, chain or belt, using an engine-driven pump and hydraulic fluid (this has been used in many prototypes and some custom bikes in the following years).
He even designed a forward traction and integral traction bike using the hydraulic transmission, I believe.
All very hi-tech but also prone to dramatic failure.
While they look pretty - very striking actually - they suffer from the slight draw back that they fail in every engineering principle you can apply to a wheel.
*The roller bearing and seal speeds are almost as high as the road speed.
* The bearings & seals are exposed to the elements.
* The wheel is no longer a entire "structure" - relying on the bearings to prevent distortion.
* rotating inertia is much higher - bearing / seals / drive being almost at tire diameter.
* very small amount of damage results in a jammed wheel.
[IMG]local://upfiles/29413/0B0B3BBED6D14FA9A143E633DE92E5C5.jpg[/IMG]
[IMG]local://upfiles/29413/468CFB5AFC494E6EBA4347AD6B8F7199.jpg[/IMG]
[IMG]local://upfiles/29413/4861E7AF370C47B994A78111B8A54288.jpg[/IMG]
*The roller bearing and seal speeds are almost as high as the road speed.
* The bearings & seals are exposed to the elements.
* The wheel is no longer a entire "structure" - relying on the bearings to prevent distortion.
* rotating inertia is much higher - bearing / seals / drive being almost at tire diameter.
* very small amount of damage results in a jammed wheel.
[IMG]local://upfiles/29413/0B0B3BBED6D14FA9A143E633DE92E5C5.jpg[/IMG]
[IMG]local://upfiles/29413/468CFB5AFC494E6EBA4347AD6B8F7199.jpg[/IMG]
[IMG]local://upfiles/29413/4861E7AF370C47B994A78111B8A54288.jpg[/IMG]
Also, another not so irrelevant problem of the hubless design is it's extremely high cost.
#26
01-17-2008, 11:05 AM
RE: The hubless wheel was invented by Franco Sbarro
ORIGINAL: 99octane
Yep, that's why although on a scale of cool between 1 and 10 they score about 14, hubless wheels have never become popular.
Also, another not so irrelevant problem of the hubless design is it's extremely high cost.
Yep, that's why although on a scale of cool between 1 and 10 they score about 14, hubless wheels have never become popular.
Also, another not so irrelevant problem of the hubless design is it's extremely high cost.
#27
01-17-2008, 07:03 PM
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RE: The hubless wheel was invented by Franco Sbarro
Hey. Regardless of who came out with the first one, my hat goes off to all of them. It's unbelievable what these guys can do.
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