Optimised architecture of a civil engineering tyre

The two-layer carcass reinforcement with smaller diameter unitary wires in radial tires for heavy civil engineering vehicles addresses the limitations of load capacity and pressure resistance, enhancing endurance and flexibility, achieving a 20% improvement in performance.

WO2022219277A1 Publication Date: 2022-10-20MICHELIN & CO (CIE GEN DES ESTAB MICHELIN)
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Patent Information

Application Number
PCT/FR2022/050679
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2021-04-15
Filing Date
2022-04-11
Publication Date
2022-10-20

AI Technical Summary

Technical Problem

The carcass reinforcement of radial tires for heavy civil engineering vehicles is a limiting factor in terms of load capacity and pressure resistance, as higher pressures increase rigidity but reduce shock absorption, and using larger diameter cables for fatigue resistance is difficult due to manufacturing challenges.

Method used

A radial tire design with two layers of carcass reinforcement, where the metal reinforcements are composed of unitary wires with diameters between 0.17 and 0.23 mm, allowing for increased flexibility and reduced diameter cables by 30-50%, optimizing bending behavior and fatigue resistance.

Benefits of technology

This design enhances the tire's load capacity by 25% or reduces inflation pressure while increasing resistance to impact, improving endurance and reducing manufacturing complexities, with a 20% improvement in sidewall and bead endurance performance.

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Abstract

A radial-carcass tyre for a civil engineering vehicle comprises two tyre bead cores (2) having a radial height Ht, and a carcass reinforcement formed of two layers. The first, radially innermost layer (1), having a radial height Hdc, is anchored in each of the beads to form a main portion (11) and a turn-over (12). A second carcass layer (3) is radially external to the first layer (1). The free end (A) of the turn-over (12) is at a radial distance from the radially outermost point (21) of the tyre bead core at least equal to 1 and at most equal to 2 times Ht. From the end A of the turn-over (12) to the point B at 85% of the radial height Hdc, the distance between the carcass layers is at least equal to 2 and at most equal to 11 times the diameter of the metal reinforcements of the first carcass layer (1).
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