WT-12
Wheel and Tyre
Use and maintenance of tyre
1.
Principles for selection of tyres
The tyres selected must satisfy relevant state rules. The tyres recommended by the automobile
manufacturer are normally adopted for different automobiles.
Tyres of an appropriate type (including specification, ply rating, speed level, etc) are selected according to
the working conditions (automobile, load, route, road conditions and tyre position).
As different patterns have different characteristics and purposes, it is necessary to choose appropriate
patterns as the case may be.
2.
Operating precautions of tyres
The use and management of a tyre is an important factor that determines its service life in addition to the
manufacturing conditions. In order to ensure safety (reduce tyre trouble, improve cost effectiveness and
prolong the service life of the tyre), it is necessary to pay attention to the proper use and reasonable
management thereof.
Internal pressure of tyre
1)
Influence of insufficient internal pressure
a)
Excessive deflection and deformation will cause the temperature inside the tyre to rise and reduce
the strength and bondage of tyre materials so that the tyre tread and tyre body or tyre body layer are
detached from each other and the tyre may even explode.
b)
Excessive deflection will easily cause crazing (mainly where the tyre tread and tyre sidewall join
together) as well as fatigue and breakage of ply cords:
c)
Excessive tyre deformation will increase the friction between tyre bead and wheel rim and thus
damage the tyre bead;
d)
Excessive deformation will reduce the critical speed of standing waves of tyre, cause the tyre to heat
up easily and result in early damage;
e)
In case of low atmospheric pressure, the tyre may suffer irregular wear and tear (e.g. tyre shoulder
abrasion) and its service life may be reduced;
f)
Low internal pressure will increase the delay loss of the tyre upon turning and increase oil
consumption;
g)
Reduce the times of recapping of the tyre;
2)
Influence of excessive internal pressure
a)
Excessive strain of the tyre tread will easily cause tyre tread degumming and crazing at the bottom
of the tyre patterns;
b)
Excessive strain of the ply cord will reduce its strength so that it will be easily damaged by blasting
and external forces;
c)
Increased strains at tyre bead will easily snap the steel wire of the bead and thus cause the tyre to
burst;
d)
Projection in the middle of the tyre tread will increase tyre load per unit area and lead to irregular
wear and tear (crown abrasion);
e)
The performance of elastic media of tyre is reduced and passenger comfort is affected;
3)
Standard atmospheric pressure
a)
The charging pressure of tyre must satisfy relevant state standards on the charging pressure of
different types and specifications of tyres;
b)
The charging pressure for front and rear wheels as recommended by the tyre manufacturer may be
adopted;
c)
New tyres may have size changes (expansion) some time after use and their internal pressure may
also be reduced. For that reason, it is necessary to check tyre pressure before startup, and check the
9-12
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