The core of a board became torn at a tire rating

Fig. 4.26 . The scheme of installation of the tire on a disk: 1–хамп (double хамп H 2); 2–onboard закраина rims; 3–internal shoulder of a rim (e.g. conic shelf); 4–rim; 5–disk; 6–cavity; 7–external shoulder of a rim (e.g. conic shelf)

Modern radial tires for cars are mounted only on safe disks. Their rims have on shoulders an eminence 1 on all circle (fig. 4.26) .

Hamp protects the tire when driving with low pressure of air in it from a soskalzyvaniye from a rim shoulder.

At a rating of the tire can happen that the tire board not completely will move through external хамп rims.

In this case there is a danger of an excessive extension of the core of a board at too high pressure therefore its steel threads will become torn partially or completely. The rupture of the core of a board is imperceptible outside.

ATTENTION Tires with the damaged core of a board leaky sit on a disk rim. Such tires are extremely unsafe at operation. Besides, there is a danger that the torn core of a board in movement will become torn completely, and the tire will suddenly blow up. At a rupture of the core of a board at a tire rating the framework also collapses.

The tire with the broken-off core of a board and the destroyed framework

Fig. 4.27 . The tire with the broken-off core

In drawing 4.27 the tire with the broken-off core and the destroyed framework as a result of excessive stretching is represented at installation.

Board damages because of erroneous or wrong mounting at the shinomontazhny stand

The following mistakes when mounting can lead to serious damages of tires:

– if at a zakatka of the top board at the shinomontazhny stand the opposite board of the tire not completely lies in a cavity;

– if the assembly head was incorrectly adjusted;

– if the edge of an assembly roller slides on an onboard roller;

– in the presence of worn-out or sharp directing rollers.

Tires with a board cut

Fig. 4.28 . Tires with a board cut

In such cases the board being under a high voltage, can be made an incision, cut and/or jammed to a core wire (fig. 4.28) .

Often in a zone of damage traces of the beginning and the end of contact to a directing roller are visible.

NOTE Essentially it is necessary to grease both boards of the tire and shoulders of a rim with shinomontazhny paste. If damages at installation remain unnoticed, there is a danger of destruction of the tire at its further operation. Never mount tires without shinomontazhny paste. Do not pump up an explosive rating from above the 3rd bar. Do not pump up the tire from above the 4th bar. At the end of mounting lower pressure of air in the tire to the ordered value.