4.1.18. Lateral withdrawal of the car

Конусность it is caused by small displacement of a protector and-or брекера in relation to the geometrical middle of the tyre on some tenth millimetre. Конусность visually it is not appreciable and it is not measured in repair truck conditions.

Because of displacement rigidity on an internal and external shoulder of the tyre different that leads to various forces. Operating on a basic surface of a wheel. Therefore брекер and a protector "rest" against a road cloth with different effort (F1, F2). The cone As a result turns out. Caused конусностью the effort (Fk) can become so big depending on speed that will start to withdraw the car in any party.

Fig. 4.18. Tyre elements: 1 – a board; 2 – a shoulder; 3 – a protector; 4 – металлокордный брекер; a – the geometrical middle of the tyre; b – actual position брекера; it can be displaced inside or outside

Fig. 4.19. The forces influencing the tyre: 1 – brekera/protector displacement; F1 – the unequal forces operating on a basic surface of a wheel; F2 – the unequal forces operating on a basic surface of a wheel; Fk – the force created конусностью

If force (Fk) on one wheel of an axis makes, for example, 50 Н, on other wheel also 50 Н, and these forces also are directed to the identical party they are summarised. Thanking переворачиванию tyres on a disk lateral withdrawal it is possible to compensate, as forces will operate in that case in an opposite side.

As on the tyre a direction in which the force caused конусностью operates, not considerably to define, what tyre has caused lateral withdrawal, it is possible only trial trips and purposeful shift of disks and tyres.

The tyre consists of many elements and materials which manufactures in the end of labour-intensive process from a part are vulcanized. Because of it various errors which can become appreciable at more or less high lateral efforts turn out. The given efforts can be shown as well on new tyres.

The reasons of lateral withdrawal can be covered in a running gear. However, by experience it is known that in from above 90 % of complaints lateral withdrawal is caused by tyres.

The car "pulls" in any party on direct, equal road, at smooth movement or moderate acceleration. Thus on a wheel the effort is felt.

Lateral withdrawal at strong acceleration from a part is put in a design of cars with a forward drive. Various conditions of a friction of the left and right wheel, including roughness of a road covering (hollow). And in this connection also changeable coupling with road, strongly influence road performance. The given problem is not a guarantee case.