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ASEMINAR ON

AIR FREE TYRES

Presented byShatadal Sarma

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INDEX Introduction

Function Of Tyres

Problems Of Aired Tyres

Air Free Tyres

Construction

Aired Tyre Vs Air Free Tyre

Advantage & Disadvantage

Application

Conclusion

Future Scope

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Introduction:

Tyre is a rubber member.

It gives the cushion to the automobile.

It consists of outer cover i.e. tyre proper and tube

inside.

The tyre-tube assembly is mounted over the

wheel rim.

Air inside the tube carries entire load and

provides cushion.

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Function Of tyre:

To support the vehicle load.

To provide cushion against the shocks.

To transmit driving and braking forces to

the road.

To provide cornering power for smooth

steering

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Properties Of Tyre:

Non-skidding

Uniform wear

Load-carrying

Power consumption

Tyre noise

Balancing

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Problems Of Air-Tyre:

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.

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Air-Free Tyres:

These are tires that are not supported by air

pressure.

The air free tyre connects to the flexible spokes.

These are used to support an outer rim.

Does not use a bladder full of compressed air

Therefore it cannot burst nor become flat.

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History Behind Air-Free Tyre:

The concept of air free tyre was first come on 1920.

Michelin first announced the Tweel in 2005. The name is a combination of the words tire

and wheel.

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Construction:

The tire consists of a cable-reinforced band of conventional tire rubber with molded tread

The rectangular spokes can be designed to have a range of stiffness, 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 energy-absorbing polyurethane  spokes

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Material Used:

Polyurethane

Ethylene glycoldibenzoinisocyanide

Polyurethane

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How does the Tyre Work?

• The spokes absorb road impacts the same way air pressure does in pneumatic tires.

• The thread and shear bands deform temporarily.• As the spokes bend, then quickly spring back

into shape.

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Aired Tyre VS Air-Free Tyres:

Aired tyre Air-Free Tyre

Air is used. No Air used.

Air takes the whole load Spokes takes the whole load

Goes flat Never goes flat

Large maintenance No maintenance

Not totally recyclable 99% recyclable

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Advantages:

Never goes Flat.

Airless tyres are maintenance free.

More durable and long lasting.

The materials used in the tyres and the spoke

structure are nearly 99% recyclable.

Can take gunfire or explosion.

Vehicle remain under control even in

emergency brake.

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Disadvantage:

Tyre suspension is not so good as like regular

tyre.

Heat generation.

Lack of adjustability.

Vibration.

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Application:

Used on some small vehicles such

as riding lawn mowers and

motorized golf carts.

In backhoe or bulldozers.

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In Military vehicles

All Terrine Vehicles (ATV)

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Case Study:

This section discusses the topology evolution of meso-structures for AFT shear band at Clemson University between Fall 2006 and 2010

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Conclusion:

No improvements are made in TIREs nowadays.

Manufacturers have started to focus making

airless TIREs.

Challenge is to make it more feasible and

economical.

When done, Airless TIREs are the future TIREs.

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Future Scope:

It can be largely used in ARMY VEHICLES as there

is no risk of puncture of tyre.

These can be used as bullet proof tyres.

It is trying to use the air less tyres in ATVs like

SEGWAY CENTAUR, a four wheeled ATV.

Now a days many companies like MICHELIN,

RESILIENT TECHNOLOGIES are working on non-

pneumatic tyres as a bright future is there.

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Futuristic Design

Aims to keep losses to minimum

95% manufacturing is recyclable

Hankook i-Flex

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References:

1. Barum (2011-2012) Technical data book of Car tyres.2. U. Suripa a, a. Chaikittiratana b, (December 2008)

„Finite element stress and strain analysis of a solid tyre‟ Journal of Achievements in Materials and Manufacturing Engineering Vol.31, issue 2.

3. y. Li, university of missouri-rolla w.y. Liu, washington university in st. Louis s. Frimpong, university of missouri-rolla. “Effect of ambient temperature on stress, deformation and temperature of dump truck tyre” (june, 2006).

4. Chih-Hsing Chu, Mu-Chi Song , Vincent C.S. Luo,(February 2005) „Computer aided parametric design for 3d tyre mold production‟ Journal of ELSEVIER”.

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THANKs...