Toothed wheel for an aircraft turbomachine

The gear design with axial dampers and integrated damping mechanisms addresses torsional vibrational stresses in aircraft turbomachines, enhancing lifespan and assembly efficiency by transforming torsional stresses into axial displacements, using elastic and viscous damping.

WO2026139678A1PCT designated stage Publication Date: 2026-07-02SAFRAN TRANSMISSION SYST
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
SAFRAN TRANSMISSION SYST
Filing Date
2025-12-17
Publication Date
2026-07-02

AI Technical Summary

Technical Problem

Existing gear trains in aircraft turbomachines experience significant torsional vibrational stresses due to torque variations and reversals, which can lead to reduced lifespan and require inefficient elastomer dampers or complex shock absorbers, and shifting low-frequency torsional modes to higher frequencies increases mass and complexity.

Method used

A gear design with axial dampers configured to transform torsional vibratory stresses into axial displacements, utilizing elastic and viscous damping mechanisms integrated into the gear structure, which includes oil inlets and outlets for efficient damping.

Benefits of technology

The axial dampers effectively reduce torsional vibration intensity, extending gear lifespan and simplifying assembly, while maintaining structural integrity and reducing mass, and can be applied to any gear in the gear train without modifying the housing.

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Abstract

The invention relates to a toothed wheel (5) for an aircraft turbomachine, the toothed wheel (5) comprising a hub (6) having a geometry of revolution about an axis (X) and a toothed web (7) which has an external toothing (8), the hub (6) and the web (7) being rotationally connected via a splined connection (9), the external toothing (8) and / or the splined connection (9) being configured to at least partially transform the torsional vibratory stresses that are exerted on the toothing (8) of the web (7) into an axial movement of the web (7), characterized in that the toothed wheel (5) comprises two axial dampers (10) disposed on either side of the web (7), the dampers (10) each being annular about the axis (X), each damper (10) having a first axial end (11) secured to the hub (6) and a second axial end (12) secured to the web (7), so as to axially damp the toothed web (7) with respect to the torsional vibratory stresses to which the toothed web (7) is subjected.
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