ASSEMBLY INCLUDING A BLADE AND A BLADE RETAINING SYSTEM

The blade retention system with a pivot and movable jaw dovetail joint distributes stress, addressing stress concentration issues in composite blades, enhancing mechanical strength and reducing mass while maintaining aerodynamic performance.

FR3153372B1Active Publication Date: 2026-05-22SAFRAN AIRCRAFT ENGINES SAS
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Patent Information

Authority / Receiving Office
FR · FR
Patent Type
Patents
Current Assignee / Owner
SAFRAN AIRCRAFT ENGINES SAS
Filing Date
2023-09-22
Publication Date
2026-05-22

AI Technical Summary

Technical Problem

Existing blade retention systems for large-dimension composite material blades in turbomachinery experience significant stress concentrations, particularly at the flange radius and lateral parts, leading to reduced lifespan due to antisymmetric loading and potential damage modes.

Method used

A blade retention system featuring a pivot with a groove and a movable jaw forming a dovetail joint, along with screws oriented parallel to the axis, distributes stress and prevents local concentration by allowing the foot to be tightly held between inclined planes, using a trapezoidal movable jaw and a groove configuration.

Benefits of technology

The system effectively diffuses stress, reduces mass, and enhances mechanical strength while maintaining aerodynamic performance, preventing damage and extending the lifespan of composite blades.

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Abstract

The invention relates to an assembly (101) comprising a blade (103) and a blade (105) retention system for an aircraft turbomachine. The blade (103) extends longitudinally along an axis (A), and the system (105) includes a pivot (113) configured to rotate about the axis (A). The system (105) further includes a movable jaw (117), and the pivot (113) includes a groove (113ba) in which the foot (111) and the movable jaw (117) are housed. The groove (113ba), the foot (111), and the movable jaw (117) together form a dovetail joint in which the foot (111) is held tightly. Figure for the abstract: Fig. 4
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