Tweel
spancolor: #ff0000""Tweel
The Tweel (a portmanteau of tire and wheel) is an experimental tire design being developed at Michelin. The tire uses no air and therefore cannot burst or become flat. Instead, flexible polyurethane spokes are used to support an outer rim. Handling gains have been cited as a reason to adopt this type of motor vehicle tire. If problems with the prototypes (such as excess vibration and noise at higher speed) are resolved, the first applications for the tire may be in the military where a flat-proof tire would be advantageous to maneuvering vehicles in difficult or dangerous areas.
Currently, the Tweel is being used for low-speed, low-weight applications, such as wheelchairs, motorbikes and construction equipment (for example, a skid loader). Tests on production cars have shown it is within 5% of a conventional tire and wheel's rolling resistance. If Michelin's prototypes go as planned, models for cars may appear around 2016.
The Tweel has been presented in a variety of applications. Eventually it may be able to outperform conventional tires since it can be designed to have high lateral strength (for better handling) without a loss in comfort.
Design
The Tweel consists of a cable-reinforced band of conventional "tire" rubber with molded tread, a shear band just below the tread that creates a compliant contact patch, and a series of energy-absorbing polyurethane spokes. The rectangular spokes can be designed to have a range of stiffnesses, so engineers can control how the Tweel handles loads. The inner hub contains a matrix of deformable plastic structures that flex under load and return to their original shape.
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spancolor: #ff0000""Air Less tyre
Non-pneumatic tires (NPT), or Airless tires, are tires that are not supported by air pressure. They are used on some small vehicles such as riding lawn mowers and motorized golf carts. Tires composed of closed-cell polyurethane foam are also made for bicycles and wheelchairs. The main advantage of airless tires is that they cannot go flat, but they are far less common than airfilled tires.
Airless tires generally have higher rolling friction and provide much less suspension than similarly shaped and sized pneumatic tires. Other problems that have plagued airless tires include dissipating the heat buildup that occurs when they are driven. Airless tires are often filled with compressed polymers (plastic), rather than air.
Michelin is currently developing an integrated tire and wheel combination, the "Tweel", that operates entirely without air
2 Videos of michlen tweel
www.youtube.com/watch?v=v7gANJWRWIs
www.youtube.com/watch?v=pcdmH_hVWBY
divtext-align: center""SOURCE..... WIKIPEDIA.....
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