High-load capacity tire with tear-resistant sidewalls

A tire composition with a balanced elastomer matrix and fillers enhances tear strength, addressing the susceptibility to tearing in high-load capacity tires, thereby increasing load-bearing capacity and durability.

JP2026514174APending Publication Date: 2026-05-01MICHELIN & CO (CIE GEN DES ESTAB MICHELIN)
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Patent Information

Application Number
JP2025562976
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-05-03
Filing Date
2024-04-30
Publication Date
2026-05-01

AI Technical Summary

Technical Problem

High-load capacity tires are susceptible to tearing due to significant flexing and stress from increased vehicle weight, especially when driving over potholes or bumps, or operating at lower pressures or higher loads.

Method used

A tire composition comprising an elastomer matrix with specific ratios of reinforcing filler and rubber powder, enhancing tear strength by using a combination of isoprene and butadiene elastomers, carbon black, and silica fillers, along with a crosslinking system.

Benefits of technology

The tire composition significantly increases load-bearing capacity without altering vehicle space or comfort, providing enhanced tear resistance and durability.

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Abstract

A passenger vehicle tire (10) includes a crown (12), two beads (32), and two sidewalls (30) connecting each bead (32) to the crown (12). The tire (10) is of the high-load capacity type as defined in the 2021 ETRTO standard manual. At least one of the two sidewalls (30) contains an elastomer composition based on at least one elastomer matrix, at least one reinforcing filler, and at least one rubber powder. The sum of the reinforcing filler content and the rubber powder content is 30 phr or more. The mass ratio of the rubber powder content, expressed in phr, to the reinforcing filler content, expressed in phr, is in the range of 0.20 to 1.50.
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