Non Pneumatic Tyres

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Information about Non Pneumatic Tyres
Technology

Published on February 22, 2014

Author: Arsalanahmedmalik

Source: slideshare.net

Description

Non Pneumatic or Airless Tyres

A pneumatic, or air-filled, tire is made of an airtight inner core filled with pressurized air. The pressure of the air inside the tire is greater than atmospheric air pressure, so the tire remains inflated even with the weight of a vehicle resting on it. It gives to a certain degree -a cushioning effect as the tire hits bumps in the road.

   The main problem is that a puncture of the tire results in total failure A blowout at high speeds can lead to a dangerous car accident. Can blow out by gunfire or explosion shrapnel Variations in air pressure and tire performance.

   Non-pneumatic tires (NPT) or Airless tires, are tires that are not supported by air pressure The air less tire connects to flexible polyurethane spokes which are used to support an outer rim and assume the shock-absorbing role of the compressed air in a traditional tire. does not use a bladder full of compressed air, and therefore it cannot burst nor become flat. Instead, the Tweel's hub connects to flexible polyurethane spokes which are used to support an outer rim and assume the shock-absorbing role of the compressed air in a traditional tire.

The tire consists of a cablereinforced band of conventional tire rubber with molded tread The rectangular spokes can be designed to have a range of stiffnesses, so engineers can control how the Tweel handles loads A shear band just below the tread that creates a compliant contact patches, and a series of energyabsorbing polyurethane spokes The inner hub contains a matrix of deformable plastic structures that flex under load and return to their original shape.

Why Airless Tires????? Unique Selling Proposition Never goes Flat Makes Vehicle more Efficient have high lateral strength for better handling without a loss in comfort Eliminate or significantly reduce aquaplaning Vehicle remain under control even in emergency brake Deflects mine blasts away from the vehicle. Remains mobile even with some of the spokes damaged or missing Durability & Long Life Less environmental impact

  The Tweel does currently have several flaws, however, the worst being vibration. Above 50 mph (80 km/h), the Tweel vibrates considerably, which in itself is a problem that also gives rise to undesired noise and heat. Airless tires generally have higher rolling resistance.

   They are used on some small vehicles such as riding lawn mowers and motorized golf carts. They are also used on heavy equipment such as backhoes, which are required to operate on sites such as building demolition, Military Usage Tweel deflects mine blasts away from the vehicle better than standard tires and that the Tweel remains mobile even with some of the spokes damaged or missing.

QUESTIONS ?

Arsalan Ahmed Malik

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