Full-process working dual-redundancy electromechanical actuator

By designing a fully redundant electromechanical actuator, which utilizes a two-phase interleaved transmission gear train and an independent transmission chain, safe and reliable redundant operation is achieved under power supply. This solves the problem of screw pair jamming, improves the actuator's task reliability and safety, simplifies the structure, and enhances control performance.

CN115978159BActive Publication Date: 2026-06-12SICHUAN LINGFENG AVIATION HYDRAULIC MACHINERY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SICHUAN LINGFENG AVIATION HYDRAULIC MACHINERY
Filing Date
2022-12-25
Publication Date
2026-06-12

AI Technical Summary

⚠Technical Problem

Existing electromechanical actuators cannot meet the high reliability requirements of aircraft, especially in the case of hydraulic system failure, which prevents the landing gear from being deployed smoothly. Furthermore, conventional dual-redundant electromechanical actuators cannot solve the single-point failure of lead screw pair jamming, resulting in low mission reliability.

⚗Method used

The system employs a fully redundant electromechanical actuator, which uses a two-phase interleaved transmission gear train on both sides of the parallel outer cylinder to mesh with the main lead screw cylinder and the auxiliary motor, forming two independent transmission chains. The main motor and the auxiliary motor serve as backups for each other, ensuring normal operation under power supply. In the event of failure of one motor or jamming of the transmission chain, the other motor can independently complete the full stroke of the piston cylinder.

🎯Benefits of technology

It achieves safe and reliable dual-redundancy operation under power supply, solves the problem of lead screw jamming, improves the reliability and safety of actuator tasks, simplifies the structure, reduces the system's control dead zone, and improves control performance.

✦ Generated by Eureka AI based on patent content.

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    Figure CN115978159B_ABST
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Abstract

The application discloses a full-process working dual-redundancy electromechanical actuator, which is safe and reliable. The application is realized by the following technical scheme: the main motor and the auxiliary motor are equipped with brakes and are backup for each other; the main motor is meshed with the main screw rod cylinder through a main transmission gear, is matched with the auxiliary screw rod cylinder through a main screw rod nut, and is stopped by a bearing; the auxiliary screw rod cylinder is meshed with the auxiliary screw rod nut which is constrained in the piston cylinder ring groove, two movement cavities which are isolated by the auxiliary screw rod nut are formed, and the piston cylinder is driven to make extension and contraction movement in the outer cylinder movement cavity; the auxiliary motor drives the gear transmission shaft to rotate through an auxiliary transmission gear; the main screw rod nut is matched with the auxiliary screw rod cylinder, the gear transmission shaft end cylinder outer spline is utilized, the main screw rod nut is driven to make extension and contraction movement in the left cavity isolated by the auxiliary screw rod nut, and then two transmission chains which are relatively independent are formed to drive the piston cylinder to make extension and contraction movement in the outer cylinder movement cavity; and the full-process working dual-redundancy quick-retracting electromechanical actuator is formed by the main screw rod cylinder which can be driven by the main motor and the auxiliary screw rod cylinder which can be driven by the auxiliary motor.
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