Tire having an improved bead structure
A carcass structure and tire technology, applied to tire parts, bead, transportation and packaging, etc., can solve the problems of carcass structure failure, separation, heat accumulation, etc.
Active Publication Date: 2013-03-20
PIRELLI TYRE SPA
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
As a result, there arises a problem that fatigue cracks are formed at the end portions of the turned-up carcass ply due to repeated occurrence of said bending deformation, and the growth of these cracks causes failure of the carcass structure.
Furthermore, said bending deformations may cause problems of heat accumulation, which may lead to separation between adjacent tire structural elements in the bead area, in particular the turned-up carcass ply and the adjacent tire structure. component separation
Therefore, the durability of the bead structure is reduced
Method used
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example 1
[0161] Two body tires (Tire 1 and Tire 2) of size 12 / 00R 20 were manufactured.
[0162] Tire 1 and Tire 2 have the same structural elements (such as figure 1 shown), that is, with the same carcass (one carcass ply); two crossed belt plies (radially inner belt ply and radially outer belt ply); the other belt ( which is superposed radially to the radially outer belt ply and is sandwiched between two zero-angle reinforcement layers); two zero-angle reinforcement layers which are radially superimposed to the radial on the outer belt ply; and the same tread strip.
[0163] The bead structure of tire 1 (comparative example) has: a bead core, two bead fillers, flaps, three stiffeners, and a wear-resistant layer.
[0164] The bead structure of tire 2 (invention) has (eg figure 1 with figure 2 shown): bead core, two bead fillers, flaps, two axially stacked second reinforcing layers, three stiffeners, wear-resistant layer.
[0165] The characteristics of the bead structures of t...
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Tire comprising: a pair of bead structures (3), said bead structures comprising at least one bead core (4) and at least one bead filler (5); a carcass structure (2) being turned up around said bead cores; a belt structure (14) a tread band (16) a pair of sidewalls (17) each one of said pair of bead structures comprising: at least one first reinforcing layer (8) which is wound around said turned up carcass ply (22) so as to at least partially envelope said bead core and said bead filler; at least one second reinforcing layer (9) axially outwardly of the first reinforcing layer; at least one antiabrasive layer portion (13) placed in an axially outermost position of a bead structure portion designed to be in contact with the rim; wherein: said at least one antiabrasive layer portion has a thickness higher than or equal to about 3.5 mm, preferably of from about 4.0 mm to about 7.0 mm, said thickness being measured in correspondence of the bead core; the end portion of said turned up carcass ply is placed at a height hi which satisfies the following relation: hi = c1 x h wherein c1 is a number ranging from about 0.15 to about 0.50, preferably from about 0.20 to about 0.30, and h is the radial distance, measured at the tire equatorial plane, from the tire nominal rim diameter to the carcass structure. Preferably, said tire is a heavy load vehicle tire.
Description
technical field [0001] The present invention relates to a tire having an improved bead structure. [0002] In particular, the present invention relates to a heavy duty vehicle tire having an improved bead structure. Background technique [0003] As is known, a tire generally comprises: a pair of bead structures, each of which comprises at least one bead core and at least one bead filler; a substantially torus-shaped carcass structure comprising at least one carcass ply, usually having a plurality of reinforcing elements extending between two bead structures, the opposite side edges of said carcass ply being turned over said bead core; a belt structure attached to the carcass structure at a radially outer position; a tread strip attached to the belt structure at a radially outer position; and a pair of sidewalls attached to the Attached to two laterally opposite sides of the carcass structure. [0004] During the rolling process of the tire under load, both the bead struct...
Claims
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IPC IPC(8): B60C15/06
CPCB60C2015/0614B60C15/06B60C15/0607B60C2015/009
Inventor C·雷亚G·塞雷达A·卡拉A·阿斯卡内里
Owner PIRELLI TYRE SPA