Engine Attachment Link Axis Assembly With Integrated Nut Locking
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Solution Overview
Problem
Existing engine attachment assemblies in aircraft have a high number of parts, increasing complexity and difficulty in assembly and removal, while also resulting in significant offset that affects the structural integrity.
Innovation Solution
A simplified assembly design featuring a link axis supported by first and second guiding rings, with a tubular extension on the second guiding ring having a threaded portion, a nut screwed onto this extension, and an immobilization system to create a single-piece, non-removable link between the nut and link axis, reducing the number of parts and facilitating mounting and removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a traditional multi-part assembly design is used for the engine attachment, then the structural integrity and immobilization of the link axis are ensured, but the number of parts increases, making assembly and removal complex and difficult
Solution Approach 1:
The patent merges multiple separate components (link axis, guiding rings, blocking devices) into a more integrated assembly structure. The tubular extension is integrated with the second guiding ring, and the blocking device is combined with the guiding ring structure, reducing the total number of discrete parts while maintaining the functional requirements for structural integrity and immobilization.
Solution Approach 2:
The second guiding ring is designed with dual functionality: it provides guidance for the link axis and simultaneously serves as a mounting structure for the tubular extension with threaded portion. This multi-functional design eliminates the need for separate mounting components, reducing overall assembly complexity while maintaining reliability.
2Ease of operation
If a traditional multi-part assembly design is used, then the immobilization of the link axis is achieved, but the assembly process becomes time-consuming and difficult to remove
Solution Approach 1:
The assembly is segmented into modular components that can be independently assembled and disassembled. The tubular extension with threaded portion allows for simplified attachment and detachment of the blocking device, reducing assembly time while maintaining the immobilization function. The modular design enables easier maintenance and removal compared to traditional multi-part assemblies.
3Ease of manufacture
If a simplified single-piece link design is used, then the number of parts is reduced and assembly is simplified, but the structural integrity and offset control may be compromised
Solution Approach 1:
The design applies local quality by providing structural reinforcement at critical locations. The tubular extension with threaded portion is strategically positioned to maintain proper offset control while simplifying the overall assembly. The blocking device is locally integrated with the guiding ring structure, ensuring that the single-piece link design does not compromise structural integrity or offset control.
Data Source
AI summary
An assembly including a link axis supported by first and second guiding rings positioned in first and second branches of a clevis, one of the guiding rings including a tubular extension, protruding with respect to an outer face of one of the branches, which has a threaded portion on its outer circumferential face. Complementing this, the assembly includes a nut configured to be screwed onto the threaded portion of the tubular extension and an immobilization system configured to immobilize the nut in translation and/or in rotation, the nut and the link axis being linked by a complete link that is non-removable or that forms a single-piece part. This solution makes it possible to reduce the number of parts forming the assembly. Also provided are an engine attachment and an aircraft including such an assembly.