Preform, mechanical part, landing gear and associated manufacturing method

The preform design with a protective layer at the interface between core and belt reinforcements addresses the issue of cracking in composite connecting rods, enhancing structural integrity and mechanical resistance.

WO2026109483A1PCT designated stage Publication Date: 2026-05-28SAFRAN SA
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Patent Information

Application Number
PCT/EP2025/083345
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-11-19
Filing Date
2025-11-18
Publication Date
2026-05-28

AI Technical Summary

Technical Problem

Connecting rods in landing gear struts made from composite materials experience cracks at the interface between fiber reinforcements, leading to mechanical degradation.

Method used

A preform design comprising a core and a belt of fibrous reinforcements with an additional protective layer covering the interface between the core and belt, formed from fibers, which can be pre-impregnated or dry, to reinforce the joint and limit force transfer at the interface.

Benefits of technology

The protective layer enhances the structural integrity of the connecting rods by reducing crack initiation and propagation at the interface, improving mechanical resistance to compression and tension.

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  • Figure EP2025083345_28052026_PF_FP_ABST
    Figure EP2025083345_28052026_PF_FP_ABST
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Abstract

The invention relates to a preform of a mechanical part, the preform comprising at least: a first sub-preform (4) which is formed at least in part from a fiber assembly, and a second sub-preform (10) which is formed at least in part from a fiber assembly, wherein the second sub-preform externally surrounds the first sub-preform, and the first sub-preform and the second sub-preform jointly form a longitudinally extending body, the preform comprising at least one protection (13) for protecting at least a portion of the preform, the protection being adapted to cover at least one zone of at least one of the longitudinal faces of the body. The invention also relates to the part, a landing gear, and associated methods.
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Citation Information

Patent Citations

  • Mechanical part and process to manufacture such a part

    EP1736674A1

  • Fiber reinforcement for the manufacture of a composite part intended to be articulated with other parts

    FR3137012A1

  • Method for manufacturing a part made of composite material intended to be articulated with other parts

    FR3137013A1

  • Fiber reinforcement for the manufacture of a composite part intended to be articulated with other parts

    FR3137014A1

  • elastic coupling part intended in particular for joint power transmissions for automobiles or the like

    FR31968E