15-01-2013, 02:09 PM
TECHNICAL SEMINAR ON AIRLESS TYRES
AIRLESS TYRES.ppt (Size: 2.39 MB / Downloads: 559)
INTRODUCTION
The Tweel Airless Tyre 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.
What is AIRLESS TYRES?
Airless tyres are the one in which have no tubes .
There are sheer band,deformable wheel,flexible spokes & layer of tread.
A solid inner hub mounts to the axle.
Hub surrounded by polyurethane spokes arrayed in a pattern of wedges
A sheer band is stretched across the spokes, forming the outer edge of the tyre.
Why we need AIRLESS TYRES?
Pneumatic tyres undergo puncture,which leads to failure.
Blow out at high speed leads to accident.
Variation in air pressure.
Pneumatic tyres are not adoptable to large changes in temperature.
Working
The spokes absorb road defects.
The flexible tread and sheer bands deform temporarily as the spokes bend.
Cushioning effect is provided by sheer band.
Tread comes in contact with road surface.
Treads can be replaced .
Advantage
Tyre Is Service-free.
No More Air Pressure Check, &No More Blow-outs .
Less Maintenance &Risk Free.
Low Mass.
High Payload Capacity.
Disadvantages
Creates vibration thus generating noise &heat.
Driving long distance produce more heat.
Manufacturing is difficult.
provide much less suspension than similarly shaped and sized pneumatic tires
Applications
Used in lower speed &lower load veichles.
Used in construction equipments.
Military applications.
Nasa applied it in lunar rover.
conclusion
Airless tyres which provide good suspension moderate speed.
They are not launched in bulk to market.
There are possibilities to reduce noise and rolling resistance.