Turbomachine propeller pitch control device

The mechanical jack and electric motor-based control device for turbomachine propellers addresses the issues of bulkiness and unreliability in hydraulic systems by reducing mass and size, improving reliability, and enabling safe electrical power integration.

FR3168581A1Pending Publication Date: 2026-05-22SAFRAN AIRCRAFT ENGINES SAS
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Patent Information

Authority / Receiving Office
FR · FR
Patent Type
Applications
Current Assignee / Owner
SAFRAN AIRCRAFT ENGINES SAS
Filing Date
2024-11-21
Publication Date
2026-05-22

AI Technical Summary

Technical Problem

Existing hydraulic cylinder and rotary joint systems for controlling variable pitch propeller blades in turbomachines are bulky, heavy, unreliable, and require excessive oil circulation, leading to increased mass, size, and heat generation, with reduced reliability and difficulty in integrating electrical power transmission.

Method used

A control device using a mechanical jack with an electric motor, drive screw, and carriage system to adjust propeller pitch without hydraulic cylinders, incorporating features like a brake, clutch, and position sensors to ensure reliable operation and reduce mass and size.

Benefits of technology

The solution reduces the mass and size of the control system, enhances reliability, and simplifies integration of electrical power transmission, while maintaining precise pitch control and providing redundancy for safe feathering in case of failures.

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Abstract

Control device for the pitch of a turbomachinery propeller. Control device (300) for the angular position (α) of a blade (310) of a variable-pitch propeller about a pivot axis (X) comprising: - a mechanical actuator (315) including a drive screw (316) and a carriage (320) meshing with the screw; - an electric motor (350) connected to the drive screw and rotating the drive screw about a longitudinal axis (Y), and - a transmission device (305) for controlling the angular position of the blade about the pivot axis connected to the carriage and intended to be connected to the blade, the carriage being movable in translation along the longitudinal axis (Y) between a retracted position (P1) and a deployed position (P2) depending on the direction of rotation of said electric motor. Figure for the abbreviation: Fig. 3
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