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  • 1. Automobile Tyres
  • 2. ContentsTyre-functions & Properties.Tyre-Types Types of carcass(Tread)Comparison of radial & bias-ply tyresTyre materials & Considerations in tread designTyre designation & Factors affecting tyre lifeTyre trouble shooting & Tyre manufacturing
  • 3. Tyre and its functionsTyre is a rubber member which 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 and air inside the tube carries entire load and provides cushion.
  • 4. Tyre cross-section
  • 5. Functions 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.
  • 6. Properties of tyresNon-skiddingUniform wearLoad-carryingCushioning Power consumptionTyre noiseBalancing
  • 7. Types of tyresConventional tubed tyre.Tubeless tyre.
  • 8. Tubed tyre
  • 9. Tubeless tyre
  • 10. Advantages of tubeless tyresLesser unsprung weight.Better cooling.Lesser rolling resistance.Comfortable ride.Slower leakage of air.Simpler assembly.Improved safety.
  • 11. Types of carcass(Tread)Cross ply (or) bias ply type.Radial ply type.Belted bias ply type.
  • 12. Cross ply (or) bias ply type.
  • 13. Cross ply (or) bias ply type.
  • 14. Radial ply type
  • 15. Radial ply type.
  • 16. Belted bias ply type
  • 17. Comparison of radial and bias-ply tyresAdvantages of radial ply tyres:- The side walls can be bend readily ,its shock absorbing capacity is 25% more than bias ply or cross ply. The breaker strips of radial tyres act independently of the wall plies unlike in cross ply where there is no breaker strip. Lower rolling resistance and hysteresis loss leads to less fuel consumption.
  • 18.  Longer tread life because of less heat build in tyre. Breaking efficiency on wet roads is better because of greater sidewall flexibility and tread stiffness. Smaller slip angles and higher cornering power which results in Better steering characteristics. While taking turns it has less tendency to distort and lift off the road from one side. Larger resistance to punctures ,cuts and impacts in the tread area.
  • 19. Tyre materialsFor carcass:- At the time of second world war, staple cotton was the tyre carcass material and it was replaced with rayon. Then nylon was introduced which is stronger, more elastic and cooler running than rayon. Then terylene was introduced.
  • 20. For cords of stabilizer belts:- Rayon ,Terylene ,glass fibre or steel.Rubber :- Rubber used in tyres is blend of natural and synthetic rubbers to which various chemicals are added to obtain desired properties like wear resistance ,reduced hysteresis, less internal friction.
  • 21. Considerations in tread design Grip Noise wear
  • 22. Tyre designation
  • 23. Factors affecting tyre life Inflation Vehicle maintenance Manner of driving Miscellaneous factors
  • 24. Tyre trouble shooting Side wear of tyres One side wear of tyres Centre wear of tyre tread Uneven tyre wear Uniform rapid wear Rapid wear with feathered edges on the tread Tread cracking Tread or ply separation Loss of tyre pressure Radial tyre lead Radial tyre waddle
  • 25. Tyre manufacturing
  • 26. Thank you