air free tires or air less tires
TRANSCRIPT
MBES COE AMBAJOGAI
ASEMINAR ON
AIR FREE TYRES
Presented byShatadal Sarma
MBES COE AMBAJOGAI
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
MBES COE AMBAJOGAI
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.
MBES COE AMBAJOGAI
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
MBES COE AMBAJOGAI
Properties Of Tyre:
Non-skidding
Uniform wear
Load-carrying
Power consumption
Tyre noise
Balancing
MBES COE AMBAJOGAI
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.
MBES COE AMBAJOGAI
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.
MBES COE AMBAJOGAI
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.
MBES COE AMBAJOGAI
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
MBES COE AMBAJOGAI
Material Used:
Polyurethane
Ethylene glycoldibenzoinisocyanide
Polyurethane
MBES COE AMBAJOGAI
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.
MBES COE AMBAJOGAI
MBES COE AMBAJOGAI
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
MBES COE AMBAJOGAI
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.
MBES COE AMBAJOGAI
Disadvantage:
Tyre suspension is not so good as like regular
tyre.
Heat generation.
Lack of adjustability.
Vibration.
MBES COE AMBAJOGAI
Application:
Used on some small vehicles such
as riding lawn mowers and
motorized golf carts.
In backhoe or bulldozers.
MBES COE AMBAJOGAI
In Military vehicles
All Terrine Vehicles (ATV)
MBES COE AMBAJOGAI
Case Study:
This section discusses the topology evolution of meso-structures for AFT shear band at Clemson University between Fall 2006 and 2010
MBES COE AMBAJOGAI
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.
MBES COE AMBAJOGAI
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.
MBES COE AMBAJOGAI
Futuristic Design
Aims to keep losses to minimum
95% manufacturing is recyclable
Hankook i-Flex
MBES COE AMBAJOGAI
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”.
MBES COE AMBAJOGAI
THANKs...