Intermediate Fastening Device for Aircraft Landing Gear Load Transfer
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Solution Overview
Problem
Current aircraft landing gear systems require reinforcement of the fuselage skin and landing gear compartment to handle loads, limiting flexibility and increasing mass, and the landing gear is typically mounted early in the assembly process, making independent testing and installation challenging.
Innovation Solution
An intermediate fastening device with a central box structure and support structures that transfers loads from the landing gear to the fuselage, allowing for independent installation and testing of the landing gear, reducing the need for fuselage reinforcement and enabling easier assembly and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the landing gear is linked to the fuselage skin in rigid zones and the bay roof, then the loads from the wheels are transmitted to the fuselage structure, but the skin and bay roof require reinforcement which increases mass and reduces flexibility
Solution Approach 1:
The invention introduces an intermediate fastening device that segments the load path between the landing gear and the fuselage. The device comprises support structures with first support means receiving the main shaft and second support means receiving the stay joint, creating an independent intermediate structure that carries the loads without requiring reinforcement of the fuselage skin and bay roof.
Solution Approach 2:
The intermediate fastening device acts as a mediator structure between the landing gear and the fuselage. It includes a central box structure with front wall, rear wall and linking walls that transfers the loads from the landing gear to the fuselage without the loads passing through the skin and bay roof, thus eliminating the need for their reinforcement.
2Stability of the object's composition
If the landing gear is mounted early in the assembly chain, then the structure is stable, but the landing gear cannot be tested independently and installation lacks flexibility
Solution Approach 1:
The intermediate fastening device is designed as a separate, modular assembly that can be manufactured and tested independently of the fuselage and landing gear. This segmentation allows the landing gear to be mounted later in the assembly process while maintaining structural stability through the standardized interface provided by the fastening device.
Solution Approach 2:
The intermediate fastening device serves multiple functions: it provides a standardized mounting interface for the landing gear, enables independent testing of the landing gear assembly, allows flexible installation timing, and maintains structural stability. This multi-functionality resolves the contradiction between early mounting for stability and late mounting for flexibility.
3Strength
If the landing gear is tightly coupled to the fuselage structure, then the structural integrity is maintained, but the mounting lacks flexibility and independent testing is difficult
Solution Approach 1:
The intermediate fastening device serves as a mediator that maintains structural integrity while enabling mounting flexibility. The device comprises support structures linked together by a central box structure with front wall, rear wall and linking walls, creating a robust intermediate interface that decouples the landing gear from the fuselage structure while maintaining load-bearing capability.
Data Source
AI summary
A device for intermediate fastening between an aircraft fuselage and an aircraft landing gear is provided. The device includes at least one semi-open support structure comprising a pair of webs, which are substantially parallel to each other. The webs comprise first support means intended to receive the main pivot shaft of the landing gear and second support means intended to receive the stay joint or joints of the landing gear. The device includes two support structures linked together by a central box structure. The central box structure includes a front wall, a rear wall and linking walls linking those two walls.