Aircraft Rear Wing Attachment With Lateral Links and Shear Pin
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Solution Overview
Problem
In aircraft propulsion systems, particularly for ultra-high bypass ratio engines, the bulkiness and distance between the primary structure of the pylon and the wing attachment create challenges in reducing the space between them, which is critical for efficient engine placement.
Innovation Solution
The design incorporates right-hand and left-hand links with ball-pivot connections and a shear pin system that allows for a reduced distance between the wing and the primary structure, with the links and shear pin positioned symmetrically to react loads, enabling closer proximity while maintaining structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional transverse links with triangular shape are used to connect the primary structure to the wing, then the attachment can react loads in transverse planes, but the bulkiness increases and the distance between the primary structure and the wing increases
Solution Approach 1:
The rear wing attachment is divided into multiple lateral links (right-hand and left-hand links) that are positioned laterally rather than transversely. Each link connects to the primary structure and wing through dedicated connecting elements, segmenting the load path into separate lateral components that can react transverse plane loads without requiring a bulky transverse configuration.
Solution Approach 2:
The attachment configuration transitions from a transverse arrangement (links positioned in transverse planes) to a lateral arrangement (links positioned laterally with respect to the primary structure). This dimensional change allows the same load reaction capability while reducing the vertical distance between the primary structure and the wing.
2Volume of moving object
If the primary structure is positioned farther from the wing, then there is more space for engine placement, but the propulsion assembly becomes less compact and engine placement efficiency decreases
Solution Approach 1:
The attachment system uses multiple segmented lateral links rather than a single transverse link, allowing the primary structure to be positioned closer to the wing while still providing adequate space for engine placement through the distributed lateral configuration.
3Stability of the object's composition
If symmetric link configuration is used, then load reaction is balanced, but the structural complexity increases
Solution Approach 1:
While maintaining overall symmetry for balanced load reaction, the design uses simplified asymmetric lateral links rather than complex symmetric transverse links. Each lateral link is configured to work with its corresponding connecting elements, creating a simpler overall structure that achieves load balance through the paired lateral configuration rather than through complex symmetric geometry.
Data Source
AI summary
An aircraft including a rear wing attachment, connecting a primary structure of an aircraft pylon to its wing, and including at least one right-hand link connected to the wing by a first right-hand connecting element and to the primary structure by a second right-hand connecting element and configured to react loads oriented parallel to the vertical direction only, at least one left-hand link connected to the wing by a first left-hand connecting element and to the primary structure by a second left-hand connecting element and configured to react loads oriented parallel to the vertical direction only, a shear pin secured to the primary structure and housed in operation in a housing secured to the wing, the shear pin and the housing being configured to react loads oriented in a plane approximately perpendicular to the vertical direction.