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Tires including lightweight crown reinforcement

A technology of tire crown reinforcement and reinforcement element, which is applied to the reinforcement layer of pneumatic tires, heavy-duty tires, special tires, etc., can solve the problems of reducing the ability of tires to withstand road hazards, and achieve the effect of improving performance

Active Publication Date: 2021-03-19
MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0024] It has been found that the ability of tires including a lighter working crown ply to withstand road hazards proves to be significantly reduced

Method used

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  • Tires including lightweight crown reinforcement
  • Tires including lightweight crown reinforcement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0102] The figures show only a half view of a tire which extends symmetrically around an axis XX' representing the circumferential mid-plane or equatorial plane of the tyre.

[0103] In the figures, a tire 1 of size 295 / 80R 22.5 comprises a radial carcass reinforcement 2 anchored in two beads (not shown in the figures). The carcass reinforcement 2 is formed of a single layer of metal cords. It also includes a tread 5 .

[0104] In the figures, the carcass reinforcement 2 is sheathed according to the invention by a crown reinforcement 4 formed radially from the inside to the outside by:

[0105] - a first working layer 41 formed by metal cords oriented at an angle equal to 26°,

[0106] - a layer of circumferential reinforcing elements 42 formed of 21x23 steel metal cords of the "dual modulus" type,

[0107] - a second working layer 43 formed of metal cords oriented at an angle equal to 18° and crossing the metal cords of the first working layer, the cords of each of the wor...

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Abstract

The invention relates to a tyre that comprises a crown reinforcement made up of two working crown plies, in which the inner-liner plies comprise carbon black, and a ply of circumferential reinforcement elements. According to the invention, the reinforcement elements of the working crown plies are metal cables having a diameter smaller than 1.3 mm, at least one wire of each metal cable of at least one working crown ply is of at least UHT grade, the modulus of elasticity of the inner-liner plies of the working crown plies is lower than 8 MPa, and the inner-liner plies of the working crown plies have a volume resistivity ρ such that log(ρ) is higher than 8.

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, such as trucks, tractors, trailers or coaches. Background technique [0002] In heavy type tires, the carcass reinforcement is generally anchored on either side in the bead area and is covered radially by a crown reinforcement consisting of at least two layers overlapping and composed of The threads or cords are formed, parallel in each layer and crossing from one layer to the next, forming an angle with the circumferential direction of between 10° and 45°. Said working layer forming the working reinforcement may further be covered with at least one layer, called protective layer, formed by a reinforcing element described below, advantageously metallic and stretchable, and called elastic reinforcing element . It may also comprise a layer of metal threads or cords forming an angle of between 45° and 90...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C9/20B60C1/00B60C9/22B60C9/00D07B1/06D02G3/48
CPCB60C9/2006B60C2001/0075B60C2009/0092B60C2009/2016B60C2009/2019B60C2009/2061B60C2009/2064B60C2009/209B60C2009/2261B60C2200/06D02G3/48D07B1/062
Inventor N·萨尔格A·拉德简A·德乔治
Owner MICHELIN & CO CIE GEN DES ESTAB MICHELIN