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Tyre having reduced weight bead region

A tire and bead wire technology, applied in heavy tires, tire parts, reinforcement layers of pneumatic tires, etc., can solve problems such as poor durability performance

Active Publication Date: 2021-06-11
MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021]While these tires are satisfactory under normal use and driving conditions, the inventors have demonstrated that driving In the case of

Method used

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  • Tyre having reduced weight bead region
  • Tyre having reduced weight bead region
  • Tyre having reduced weight bead region

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0100] figure 1 Only a half view of a tire is shown, which extends symmetrically with respect to the circumferential median plane or equatorial plane of the tire.

[0101] exist figure 1 In , the size of tire 1 is 12R 22.5. Said tire 1 comprises a radial carcass reinforcement 2 anchored in two beads 3 . The carcass reinforcement 2 is sheathed at the crown of the tire by a crown reinforcement 5 , which is itself covered by a tread 6 .

[0102] A carcass reinforcement 2 formed of a single layer of metal cords is wound around a bead wire 4 in each bead 3 and forms in each bead 3 a turn-up 7 with an end 8 of the carcass reinforcement layer .

[0103] The carcass reinforcement 2 is composed of reinforcing elements between two calendered layers having a tensile modulus of elasticity at 10% elongation equal to 9.8 MPa.

[0104] The reinforcing elements of the carcass reinforcement 2 are cords 19.18 whose elongation at break is equal to 2.5%.

[0105] figure 1 Also shown is the...

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PUM

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Abstract

The invention relates to a tyre (1) having a radial carcass reinforcement (2) formed by a single ply of reinforcement elements, the single ply being turned up around a bead core (4) so as to be anchored in each of the beads (3). According to the invention, the turn-up of the carcass reinforcement ply (7) and the main part of the carcass reinforcement ply (2) are coupled to one another, and the turn-up of the carcass reinforcement ply (7) and the main part of the carcass reinforcement ply (2) are the only plies of reinforcement elements present in the rim with an elongation at rupture of less than 6 %. The arrangement and selection of the polymer blends of the bead region of the tyre enhance the endurance performances regardless of driving conditions, in particular during driving under extreme conditions in terms of transported loads or tyre pressure.

Description

technical field [0001] The present invention relates to tires with radial carcass reinforcement, and more particularly to tires intended to fit vehicles carrying heavy loads and traveling at sustained speeds, such as trucks, tractors, trailers or coaches. Background technique [0002] In tires of the heavy-duty type, the carcass reinforcement is generally anchored on both sides of the bead area and is covered radially by a crown reinforcement consisting of at least two layers superimposed and composed of wire or cords, said threads or cords being parallel in each layer and crossing from one layer to the other, forming an angle with the circumferential direction of between 10° and 45°. Said working layer forming the working reinforcement may also be covered with at least one layer called protective layer formed by reinforcing elements, advantageously metallic and stretchable, and called elastic reinforcement element. It may also comprise a layer of metal threads or cords ha...

Claims

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Application Information

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IPC IPC(8): B60C15/00B60C15/024
CPCB60C15/0009B60C15/0036B60C15/0054B60C15/0063B60C15/024B60C2009/0276B60C2015/009B60C2015/0621B60C2200/06
Inventor P·芒叙L·贝斯根E·乔琳
Owner MICHELIN & CO CIE GEN DES ESTAB MICHELIN