4.1.21. Design of the radial tire

Fig. 4.20. Cross-section of the radial tire: 1 – protector block; 2 – protector flute; 3 – protector; 4 – nylon bandage; 5 – cord layers; 6 – board core; 7 – amplifier of a board; 8 – protection of an onboard zakraina

Nylon bandage 4, layers of a cord 5, cores of a board 6 and amplifiers of a board 7 base a framework. The framework is "the bearing element" of the tire.

Damages from blows
Camber in a sidewall of the tire indicates damage of a framework.

Fig. 4.21. Arrival on a border at an acute angle

Typical "responsible" for similar damages are, for example, borders at accident of running-down them at an acute angle (fig. 4.21).
Because of it the framework of so strongly compressed tire can be damaged.
The tire framework at the same time strongly stretches that leads to a rupture of separate fibers.
The scale of damage depends on speed and the angle of blow, air pressure in tires, loads of an axis and a type of an obstacle.

Fig. 4.22. Blow/jamming traces in a tire sidewall

Arrival on borders should be avoided.
If it is necessary to drive on a border after all, then through its edge it is necessary to move at an obtuse angle and very slowly.

Fig. 4.23. The tire with the broken-off framework, a look from within

Because of strong blow the framework was jammed at an onboard zakraina and became torn in a point of contact (fig. 4.23).

Internal damage of the tire because of blow (a double gap)

Fig. 4.24. Double gap

The double gap which resulted from compression at arrival on a border is often imperceptible outside (fig. 4.24).