Energy unlocking and mechanical unlocking interaction form of landing gear emergency release mechanism and method

By designing a landing gear emergency release mechanism that combines energy unlocking and mechanical unlocking, the shortcomings of the single emergency release method in the existing technology are solved. This enables normal unlocking even when energy fails, enhances the redundancy of landing gear emergency release, and ensures safe landing of the aircraft.

CN122276141APending Publication Date: 2026-06-26XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
Filing Date
2025-12-30
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

In existing technologies, aircraft landing gear emergency release mechanisms mostly adopt a single energy emergency release or mechanical emergency release form, making it difficult to combine the two emergency release forms. This results in the landing gear being unable to unlock normally when the energy or emergency energy fails, affecting the safe landing of the aircraft.

Method used

Design a landing gear emergency release mechanism that combines energy-based and mechanical unlocking. The mechanism uses an emergency unlocking actuator and a steel cable to drive a triangular rocker arm, enabling interactive operation of energy-based and mechanical emergency releases. This ensures that the landing gear can still be unlocked mechanically even when energy fails.

Benefits of technology

It enables unlocking using energy when energy is available, and can still be unlocked mechanically when energy fails, enhancing the redundancy of the landing gear emergency deployment and ensuring safe landing of the aircraft.

✦ Generated by Eureka AI based on patent content.

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Abstract

This application belongs to the field of aircraft structural design, and specifically relates to a landing gear emergency release mechanism and method with an interactive form of energy-based and mechanical unlocking. It includes an emergency unlocking actuator, a steel cable, an outer rocker arm, a triangular rocker arm, a locking key, and a locking strut. The piston rod of the emergency unlocking actuator is connected to the triangular rocker arm, and its bottom is connected to the fuselage structure. The steel cable is connected to the outer rocker arm, and the outer rocker arm is connected to the end of the triangular rocker arm. A second roller is provided on the triangular rocker arm. The locking key is connected to the locking strut. Both the emergency unlocking actuator and the outer rocker arm can drive the three-stage rocker arm to rotate. When the triangular rocker arm rotates at a certain angle, the second roller can push the locking key to rotate. When the locking key rotates, it can drive the locking strut to rotate. This mechanism achieves both the function of emergency landing gear unlocking using energy when energy is available and the function of unlocking the landing gear using a purely mechanical means when all energy is completely unavailable, thus enhancing the redundancy of the landing gear emergency release.
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