Rear Engine Attachment Clevis for Aircraft Pylon Assembly
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Solution Overview
Problem
Conventional aircraft engine pylon assemblies require a large number of components, leading to complexity and potential inefficiencies in design and manufacturing.
Innovation Solution
A simplified pylon engine assembly using a rear engine attachment with two fittings on either side of the median plane, featuring transverse arms that form a female clevis with a lower rod articulated within, reducing the number of components and improving mounting efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fastening members with multiple rods are used to attach the pylon to the wing and engine, then the structural strength and reliability are ensured, but the number of components increases and device complexity increases
Solution Approach 1:
The patent combines multiple separate fastening members (front rods and rear rods) into a single integrated rear engine attachment component. This rear engine attachment includes a sole with two fittings, each having transverse arms that form a female clevis, which collectively perform the fastening function previously requiring multiple separate rods. The merging reduces component count while maintaining the structural strength through the integrated design of the clevis mechanism.
Solution Approach 2:
The rear engine attachment is segmented into two symmetric fittings disposed on either side of the median plane, with each fitting having its own transverse arms forming a female clevis. This segmentation allows for balanced load distribution while using fewer components overall compared to the conventional approach of having separate fastening members for each attachment point.
2Ease of repair
If multiple separate fastening members are used for the rear engine attachment, then the ease of repair and replacement are improved, but the device complexity and assembly time increase
Solution Approach 1:
By merging the front and rear rods into a single rear engine attachment component with integrated fittings and transverse arms, the patent reduces the number of parts that need to be assembled and tracked. While the component is more integrated, the symmetric clevis design allows for efficient assembly and potential replacement as a unified module, reducing overall assembly time despite the reduced number of replaceable sub-components.
3Productivity
If a simplified rear engine attachment with fewer components is used, then the manufacturing efficiency and weight are improved, but the structural integrity and reliability may be compromised
Solution Approach 1:
The patent achieves manufacturing efficiency through the integrated rear engine attachment design that combines multiple functions into fewer components, reducing manufacturing steps and potential assembly errors. The structural integrity is maintained through the clevis mechanism with transverse arms that provide robust mechanical connection, and the symmetric arrangement ensures balanced load distribution. The lower rod with articulated mounting provides additional structural support while maintaining the simplified component count.
Solution Approach 2:
The articulated mounting of the lower rod in the female clevis provides dynamic adjustment capability, allowing the connection to accommodate operational stresses and movements while maintaining structural integrity. This dynamic feature ensures reliability under varying load conditions despite the simplified component structure.
Data Source
AI summary
An assembly of a pylon and of an engine with a rear engine attachment having two fittings, wherein each one has a shoe fastened to a lower spar of the pylon, two transverse arms, one front and one rear, which are as one with the shoe and offset such that the front transverse arm, respectively rear transverse arm, of one fitting bears in planar fashion against the front transverse arm, respectively rear transverse arm, of the other fitting, wherein each transverse arm is pierced with a bore, wherein the two front transverse arms and the two rear transverse arms are spaced apart parallel to the longitudinal direction and thus form a female clevis, and wherein the assembly also has a lower rod mounted articulated in the female clevis and on the engine. With such an assembly, the number of components is reduced.