optimized civil engineering pneumatic architecture

By integrating a high thermal conductivity diffusion material with graphite and carbon black in civil engineering tires, the overheating and endurance issues are addressed, maintaining curing times and enhancing thermal performance and endurance.

FR3156068B1Active Publication Date: 2025-11-21MICHELIN & CO (CIE GEN DES ESTAB MICHELIN)
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Patent Information

Application Number
FR2023013585
Authority / Receiving Office
FR · FR
Patent Type
Patents
Current Assignee / Owner
Filing Date
2023-12-05
Publication Date
2025-11-21
Estimated Expiration
2043-12-05

AI Technical Summary

Technical Problem

Civil engineering tires face issues with overheating due to the use of silica-filled elastomeric materials, leading to prolonged curing times and reduced endurance due to crack propagation in the crown layers, while maintaining optimal thermal conductivity and endurance properties is challenging.

Method used

Incorporating a diffusion material with high thermal conductivity, composed of an elastomeric matrix containing graphite and carbon black, between the tread and crown reinforcement to dissipate heat effectively, ensuring optimal curing times and improved endurance.

Benefits of technology

The solution maintains curing times and enhances thermal performance and endurance by using a diffusion material with specific thermal conductivity, reducing crack propagation and improving rolling resistance.

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Abstract

A civil engineering tire (1) comprises a tread (2) consisting of at least two rubber compounds (23, 24), a first rubber compound (23) intended to contact the ground and a second rubber compound (24) radially inside it, and a crown reinforcement (3). On either side of the equator plane (OXZ), a crown packing compound (6) is located between the end of the widest working layer (321) and the carcass reinforcement (4), and crown decoupling compounds (5) are located between the axial ends of the crown layers (311, 312, 321, 322, 331, 332) and the nearest crown layer. The elastomeric materials of the decoupling compounds (5) or crown packing compounds include silica as a reinforcing filler. The thermal conductivity of the at least second rubbery compound (24) is at least 0.35 W / mK. (Shorthand figure: Figure 1)
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