1. AIRLESS TYRE/ NON-
PNEUMATIC TYRE
Guided by
Dr. R G Patil
Mr. Balakrishna
Presented by
Permi Jagadish
1AT10ME031
ATRIA INSTITUTE OF TECHNOLOGY
BANGALORE
DEPARTMENT OF MECHANICAL ENGINEERING
TECHNICAL SEMINAR ON

2. Topics
 What is a pneumatic tyre and its drawbacks.
 What is an airless tyre?
 How it works?
 Different design approaches.
 Advantages and disadvantages.
 Applications.

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

4. Drawbacks
 Puncture or Blowout.
 A blowout at high speeds can lead
to a dangerous car accident.
 Variations in air
pressure changes tyre
performance.
 Can blow out by gunfire or
explosion.

5. What is airless tyre?
 Airless tyres or
Non-pneumatic
tyres (NPT) ,
are tyres that are
not supported
by air pressure.

6. continued..

7. How it works?
The flexible tread and
shear bands deform
temporarily as the spokes
bend, then quickly go
back to the initial shape.

9. Design approach
NASA’S Apollo
Lunar Rover
Michelin

10. continued..
Bridgestone
Resilient
Technologies,
LLC

11. Advantages
 Eliminates air leaks or tyre 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.

12. Disadvantages
 Lack of adjustability.
 Vibration.
 Different Manufacturing technique.
 Not as economic as pneumatic tyres.

13. Applications
Used on some small vehicles
such as riding lawn
mowers and
motorized golf carts.
In backhoe or bulldozers.

14. continued..
For Military vehicles
Also used in
All Terrine Vehicles (ATV)

15. Conclusion
For years, vehicles have been running on pneumatic
tyres and there was almost a full stop for any further
improvement of tyres. In 20th century the engineers have
come up with a new concept where the tyres never require
air, if the drawbacks that are being encountered presently
are and improved then there is good future for these tyres.
And the vehicles can run without the necessity of air.