05/31/2011

Tyre functions

The purpose of tyres is to apply the driving and braking forces of a vehicle to the road surface. Further functions are support for and transport of loads at a sufficient speed.

Requirements on tyre design and the rubber materials used
1. Economic viability
2. Comfort
3. Environmentally sound operation
4. Safe driving

The main details can be outlined as follows:
• Very safe driving at high speeds, i.e. including maintenance of effective grip and the necessary stability when cornering
• Short braking distance, particularly on wet roads; grip is important here too
• Low rolling resistance, reduces fuel consumption
• Low noise generation; to make sure this is the case, the material and the design must be insensitive to mechanical influences
• Same driving characteristics in temperatures ranging between –40°C and +100°C
• High load-bearing capacity
• Low wear increases useful life

Tyre structure at a glance:

The bead: is supposed to hold the tyre securely on the rim while the vehicle is moving

The sidewall: protects the tyre substructure from damage

The inner liner: replaces the inner tube in tyres

The carcase: is supposed to guarantee tyre stability at high air pressure

The belt: reduces rolling resistance and improves performance at high speeds

The tread: the purpose of this is to apply driving / braking force to the road effectively. It also protects the carcase from abrasion and destruction.