Pitch-change mechanism with inverse kinematics

EP4608716A1Pending Publication Date: 2025-09-03SAFRAN AIRCRAFT ENGINES SAS
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Patent Information

Application Number
EP2023813431
Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2022-10-28
Filing Date
2023-10-27
Publication Date
2025-09-03

AI Technical Summary

Technical Problem

Variable pitch blades in turbomachines are biased towards the sail position due to centrifugal effects, leading to significant stresses in the connection system, which increases weight and complexity, and requires robust sizing to withstand these stresses.

Method used

A pitch change mechanism with a connection system that includes a first and second articulation secured to the movable and blade parts, respectively, and a connecting member that converts translation into rotation, allowing for precise control of blade pitch with a compact control cylinder and fluidic chambers, and a pitch locking device to stabilize the mechanism.

Benefits of technology

The solution reduces the weight and complexity of the connection system, facilitates assembly, and allows for precise control of blade pitch, minimizing stresses and enhancing the efficiency of turbomachines by optimizing blade orientation during different flight phases.

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Abstract

The invention relates to a pitch-change mechanism (70), which comprises a frame (72) and an actuating cylinder (74) including a movable portion (102) that is translatable relative to the frame (72). The mechanism also comprises a connection system (78) capable of converting a translation of the movable portion (102) in a first direction into a rotation of the variable-pitch blade (56) towards the flat position, and a translation of the movable portion (102) in a second direction into a rotation of the variable-pitch blade (56) towards the feathered position. This connection system (78) comprises a first hinge (144) rigidly connected to the movable portion (102) and a second hinge (146) rigidly connected to the variable-pitch blade (56). The first hinge (144) is arranged upstream of the second hinge (146), the first direction going from upstream to downstream.
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