Glossary - Corghi Master J Manual De Uso

14. GLOSSARY

Tyre
A tyre consists of: I-the tyre, II- the rim (wheel), III-the air
chamber (in tube type tyres), IV-pressurised air.
The tyre must:
- withstand a load,
- ensure driving power,
- steer the vehicle,
- aid handling and braking,
- aid vehicle suspension.
I - Tyre The tyre is the main part of the complex that is in
contact with the road and is therefore designed to support
the internal air pressure and all other stress arising from use.
The tyre section shows the various parts it consists of:
1 - The tread. It is the part in contact with the road while
the tyre is rolling. It comprises a rubber compound and a
"pattern" suitable for ensuring good resistance to abrasion
and good grip in dry and wet conditions, as well as quiet
operating conditions.
2 - Edge or bracing. This is a metal fabric or textile insert, in
the area of the outer bead part. It protects the casing plys
from rubbing against the rim.
3 - Casing. This is the resistant structure and comprises one
or more layers of rubber plys. The way the plys comprising
the casing are arranged give the structure its name. The
following structures are possible:
Conventional: the plys are inclined and arranged so that
the strands comprising a ply overlap with those of the
adjacent ply. The tread, which is the part of the tyre in
contact with the ground, is part of the sidewalls and so
during rolling, sidewall flexure is transmitted to the tread.
Radial The casing consists of one or more plys with the
cords in a radial direction.
A radial casing in itself is quite unstable. To make it sta-
ble and prevent incorrect tread movement in the area
of contact with the ground, the casing and the tread are
reinforced with an annular structure, usually called a belt.
The tread and sidewall work with different, independent
rigidities, so during rolling, sidewall flexure is not trans-
mitted to the tread.
4 - Side ring This is a metal ring with various steel wires.
The casing plys are secured to the side ring.
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