The document discusses airless tires as an alternative to traditional pneumatic tires. It begins by describing pneumatic tires and their drawbacks such as punctures and blowouts. An airless tire is then defined as a tire that does not use air pressure, instead using flexible materials like polyurethane spokes to support the outer rim. Several companies have developed airless tire designs with different spoke and rim configurations. The document outlines the advantages of airless tires like puncture resistance and lack of maintenance needs, as well as disadvantages including lack of adjustability and potential for more vibration. Applications discussed include use on small vehicles and military vehicles.

1. AIRLESS TIRE
Presented BY
Jayant N Sarode(14MCD0017)
VIT UNIVERSITY VELLORE
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2. CONTENTS
 What is a pneumatic tire and its drawbacks
 What is an airless tire?
 How it works?
 Different design approaches
 Advantages and disadvantages
 Applications
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3. PNEUMATIC TIRES
 A pneumatic, or air-filled, tire is
made of an air tight inner core
filled with pressurized air.
 The pressure of the air inside the
tire is greater than atmospheric
air pressure.
 Cushioning Effect
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4. DRAWBACKS
 Puncture or Blowout.
 A blowout at high speeds can lead
to a dangerous car accident.
 Variations in air
pressure changes tire performance.
 Can blow out by gunfire or
explosion.
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5. Introduction
 The Tweel Airless Tire was first developed in 2005
by Michelin.
 The Tweel name is a combination of the words tyre
and wheel.
 Tweel's hub connects to flexible polyurethane
spokes which are used to support an outer rim.
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6. WHAT IS AIRLESS TIRE?
 Airless TIREs or
Non-pneumatic
TIREs (NPT) ,
are TIREs that
are not
supported by air
pressure.
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7. AIRLESS TIRE
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8. HOW IT WORKS?
The flexible tread and
shear bands deform
temporarily as the spokes
bend, then quickly go
back to the initial shape.
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Deformation of tire when it get through the
obstacle

10. DESIGN APPROACH
NASA’S Apollo
Lunar Rover
Michelin
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11. continued..
Bridgestone
Resilient
Technologies,
LLC
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12. ADVANTAGES
 Eliminates air leaks or TIRE blow outs.
 No maintenance required.
 Facilitate recycling.
 Remains mobile even with some of the spokes are damaged
or missing.
 Durability & Long Life.
 Can take gunfire or explosion.
 Less environmental impact.
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13. DISADVANTAGES
 Lack of adjustability.
 Vibration.
 Different Manufacturing technique.
 Not as economic as pneumatic TIREs.
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14. APPLICATIONS
Used on some small vehicles
such as riding lawn
mowers and
motorized golf carts.
In backhoe or bulldozers.
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15. APPLICATIONS
For Military vehicles
All Terrine Vehicles (ATV)
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16. Futuristic Design
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Hankook i-Flex
Aims to keep losses to minimum
95% manufacturing is recyclable

17. 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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