Corghi Artiglio 500, Operator'S Manual

Page: 78 / 265

78 Operator’s manual Artiglio 500
GLOSSARY
Tyre
The tyre is a combination of:
I-tyre, II-rim (wheel),
III-inner tube (in tube-type tyres), IV-pressurised
air
The tyre must:
- support the load,
- ensure the transmission of the drive forces,
- steer the vehicle,
- contribute to roadholding and braking,
- contribute to the vehicle’s suspension.
I - Tyre. The tyre is the main element of the wheel-
tyre combination which is in contact with the road
and is therefore required to withstand the internal
air pressure and all the other stresses generated
by use.
A cross-section view of the tyre shows all its con-
stituent parts:
1 - Tread.
It is so-called because it comes into contact
with the ground as the wheel turns. It consists of a
rubber blend and of a “pattern” designed to ensure
both good resistance to abrasion and a good grip
on the ground in wet and dry conditions, as well
as low running noise.
2 - Edge or reinforcement. A woven metal or fabric insert
on the outside of the bead; it protects the carcass
plies from rubbing against the rim.
3 - Carcass.
It provides the resistant body of the
tyre and consists of one or more layers of rubber-
coated fabric, or plies. The way in which the plies
which make up the carcass are arranged gives the
name to the tyre’s structure. There are the following
different structural types:
Bias ply.
The plies are laid at angles and
arranged so that the strands in one ply form
a criss-cross pattern with those of the next
ply. The tread, which is the part of the tyre
touching the ground, is in a single piece
with the sidewalls and so as the wheel turns
any flexural movements of the sidewall are
transmitted to the tread.
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5
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I III
II IV
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12
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