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Tyre comprising a layer of circumferential reinforcing elements

By adopting the design of cross-working crown layer and circumferential reinforcing element layer in the tire, combined with the uniform rubber mixture layer C, the problem of durability and wear of the crown reinforcement is solved, and the durability and wear performance of the tire are maintained and manufacturing simplification, reduced manufacturing costs, and improved rolling resistance.

Active Publication Date: 2014-06-25
MICHELIN & CO (CIE GEN DES ESTAB MICHELIN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The combination of conditions in which such tires are driven undoubtedly results in increased miles driven and reduced wear on the tires; on the other hand, the durability of the tires and especially the crown reinforcement is adversely affected

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0160] The figures are not drawn to scale for ease of understanding. The figures represent only a half-view of a tyre, which extends symmetrically with respect to an axis XX' representing its circumferential median plane or equatorial plane.

[0161] exist figure 1 In , a tire 1 of size 315 / 70R22.5 has an aspect ratio H / S equal to 0.70, where H is the height of the tire 1 on its mounted rim and S is its maximum axial width. Said tire 1 comprises radial carcass reinforcement 2 anchored in two beads (not shown in the figures). The carcass reinforcement is formed from a single layer of metal cords. Said carcass reinforcement 2 is hooped by a crown reinforcement 4 formed radially from the inside to the outside by:

[0162] - a first working layer 41 formed of unhooped, inextensible metal cords 9.28 continuous over the entire width of the ply and oriented at an angle equal to 24°,

[0163] - a layer 42 of circumferential reinforcing elements formed of steel metal cords 21x23 of...

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PUM

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Abstract

A tire having a crown reinforcement formed of at least two working crown layers having unequal axial widths, a layer C of rubber mixture being positioned between at least the ends of the said at least two working crown layers, and the crown reinforcement having at least one layer of circumferential reinforcing elements positioned radially between two working crown layers. The distance d between the end of the axially narrowest working layer and the working layer separated from the axially narrowest working layer by the layer C of rubber mixture is such that 1.1ø≰d≰2.2ø, ø being the diameter of the reinforcing elements of the said at least one layer of circumferential reinforcing elements, and, in a meridian plane, the thickness of the layer C of rubber mixture is substantially uniform.

Description

technical field [0001] The present invention relates to tires with radial carcass reinforcement, in particular tires intended to equip vehicles carrying heavy loads traveling at sustained speeds, such as vans, tractors, trailers, or buses. Background technique [0002] Usually, in tires of the heavy-duty type, the carcass reinforcement is anchored on either side in the bead area and is radially covered by a crown reinforcement consisting of at least two superimposed The layers are formed by threads or cords parallel in each layer and crossing from one layer to the next so as to form an angle with the circumferential direction of between 10° and 45°. Said working layer forming a working reinforcement may also be covered by at least one "protective" layer, advantageously formed by metallic and stretchable (called elastic) reinforcing elements. It may also comprise a layer of low-stretch metal threads or cords forming an angle between 45° and 90° with the circumferential direc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C1/00B60C9/18B60C9/20
CPCB60C2009/2067B60C2009/1864B60C9/2006B60C9/185B60C9/18B60C9/28B60C2009/1842B60C1/00B60C2200/06Y10T152/10801
Owner MICHELIN & CO (CIE GEN DES ESTAB MICHELIN)