This document discusses Tweel tires, which are non-pneumatic tires that do not use air. Tweels use flexible polyurethane spokes connected to a hub to support an outer rim and absorb shocks like traditional pneumatic tires. The document covers the design, materials, applications and advantages of Tweels over pneumatic tires, such as increased fuel efficiency, elimination of puncture risks, and recyclability of materials. Tweels are used on small vehicles and military vehicles where their durability is beneficial compared to pneumatic tires.

1. CONTENTS
1. Introduction
2. Function of Tyres
3. Properties of Tyres
4. Importance of Tweel Tyres over the Pneumatic Tyres
5. Design consideration and Material Used
6. Working
7. Applications
8. Advantages
9. Disadvantage
10. Conclusion
11. Reference

2. TYRE IS A RUBBER MEMBER WHICH GIVES THE COUSION TO THE AUTOMOBILE. IT
CONSIST THE OUTER COVER I.E.TYRE PROPER AND TUBE INSIDE
.
THE TWEEL TYRES;-THE TYRE USES NO AIR,
AND THEREFORE CANNOT BURST OR 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 A TRADITIONAL TIRE’ PNEUMATIC PROPERTIES.
INTRODUCTION

3. FUNCTION OF TYRES
o To support the vehicle load.
o To provide the cousion against the shock.
o To transmit driving and braking force to
the road.
o To provide cornering power for smooth
steering.

4. PROPERTIES OF TYRES
o NON ~SKIDDING.
o UNIFORM WEAR
o LOAD CARRING
o POWER CONSUMPTION
o BALANCING

5. IMPORTANCE OF TWEEL TYRES

6. DESING CONSIDERATION AND
MATERIALS USED
The Tweel consists of a cable-reinforced band of conventional "tyre"
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. Both the shear beam and the
polyurethane spokes can be designed to provide a calibrated
directional stiffness in order that design engineers are able to
control both how the Tweel handles and how it handles loads.
• Run-out capacity
• Mileage
• Durability

7. WORKING

9. APPICATION
• They are used in
military vehical.
• They are used in
the construction
equipments
such as
bachhoes.

10. APPLICATIONS
 They are used on some
small vehicles such as
golf cart and the lawn
movers.
 They are used as Tyres
of the space vehicals

11. ADVANTAGES OF TWEEL TYRES
 Increased fuel efficiency.
 The material used in the spokes are 100% recyclable.
 Provides low rolling resistance and contributing to reduction
in co2 reduction.
 The worry of punctures is eliminated.
 Stability Improvement.

12. DISADVANTAGES
o Lack of adjustability.
o Not as economic as pneumatic tyres.
o Vibrations .

13. CONCLUSION
It is concluded that tyres featuring low noise
and low rolling resistance will be required in the near
future and that the interest in and need for improved
characteristics in this respect will receive much
more attention and priority in the tyres of the next 10
years than for present market tyres.

14. REFRENCES
[1] Bras, B. and Cobert, A., "Life-Cycle Environmental Impact of Michelin
Tweel®Tire for Passenger
Vehicles," SAE Int. J. Passeng. Cars – Mech. Syst. 4(1):32-43, 2011,
doi:10.4271/2011-01-0093.
[2] Gent AN, Walter JD. The pneumatic tire. Washington DC: National
Highway ,Traffic Safety Administer
[3] Alfredo RV. Airless tire. US patent, US 3,329192; 1967.
[4] Palinkas RL, Page GJ. Non pneumatic tire with supporting and cushioning
[5] Zevenhoven, R., Treatment and disposal of polyurethane wastes: options
for recovery
[6] Numerical Simulation of the new generation Non-Pneumatic Tweel™ and
Sand : United States Patent Application Publication PUB No. US
2008/0314486 A1 by Ali Mahesh et.al.

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