Segmented Ferrule Case With Articulation Devices For Engine Maintenance
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Solution Overview
Problem
The existing case structure between aircraft engines and nacelles hinders easy access for maintenance due to its rigid design, which obstructs the aerodynamic flow and complicates maintenance operations, requiring a solution that balances accessibility with aerodynamic continuity and structural integrity.
Innovation Solution
A segmented cylindrical frame with articulation devices that allow ferrule segments to pivot and lock independently, enabling easy retraction for maintenance without disrupting the aerodynamic flow, using a series of pins and locking plates for secure attachment to radial arms, allowing for easy access to equipment without the need for temporary storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid case structure is used to ensure structural integrity and aerodynamic continuity, then structural strength and aerodynamic performance are improved, but maintenance accessibility deteriorates
Solution Approach 1:
The case structure is divided into multiple removable segments rather than a single rigid piece. Each segment can be independently removed to access equipment behind it, while the remaining segments maintain structural integrity and aerodynamic continuity. The segments are connected through articulation devices with pins and locking plates that allow controlled disassembly and reassembly.
2Ease of operation
If a segmented ferrule structure is used to improve maintenance accessibility, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The ferrule segments are equipped with articulation devices that enable dynamic movement between locked and unlocked positions. The articulation mechanism with pins and locking plates allows segments to pivot outward for maintenance access, then return to and lock in their original position, providing controlled flexibility without permanent structural complexity.
3Loss of time
If ferrule segments are made removable for easy maintenance access, then maintenance time is reduced, but reliability of structural connection deteriorates
Solution Approach 1:
The articulation devices with pins and locking plates are pre-configured in the ferrule segments and radial arms, allowing for quick engagement and disengagement during maintenance. The locking mechanism ensures that when segments are reassembled, they automatically secure in the correct position, eliminating the need for complex alignment procedures and ensuring reliable reconnection.
Data Source
AI summary
A case structure interposed between the engine and the nacelle of the aircraft is provided. The case structure includes: a ferrule surrounding the engine and including a plurality of segments; at least one radial arm ensuring connection to the nacelle; and a plurality of attachment devices for securing the plurality of ferrule segments together or with at least one radial arm. The plurality of attachment devices includes an articulation device configured for ensuring coupling of the lifted-rotated-pushed type ensuring after disengagement of the ferrule segment, its pivoting about a pivot axis parallel to a longitudinal axis of the engine and then its blocking in a disengagement position.