Aircraft Engine Mount Rear-Facing Shear Pin Installation
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Solution Overview
Problem
The existing aircraft engine mounting systems face difficulties in accessing and fitting shear pins and tension bolts due to the structural impediment of the front engine mount, making it challenging to secure the engine properly.
Innovation Solution
The proposed assembly includes a pylon with a mounting plate and a front engine mount featuring central and peripheral bores, shear pins with flanges, supports, and caps, along with a rotation-proofing system for tension bolts, allowing for easier installation from the rear side even if the front side is inaccessible.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the front engine mount is positioned against the front edge of the pylon with horizontal shear pins, then the mounting structure is simplified, but access to the front face for fitting shear pins and tension bolts becomes difficult
Solution Approach 1:
The patent inverts the traditional fitting direction by enabling shear pins and tension bolts to be installed from the rear face of the mounting plate rather than requiring access to the front face. The rear face is equipped with opening sections and guiding elements that allow components to be inserted and positioned correctly from the rear, eliminating the need for front face access.
Solution Approach 2:
The patent introduces intermediary elements such as guiding elements and opening sections that facilitate the installation process. These intermediaries enable the shear pins and tension bolts to be properly positioned and inserted from the rear face by providing guidance and access paths that would otherwise not exist in the conventional mounting configuration.
2Strength
If the engine is fixed to the front engine mount, then the engine is securely mounted, but access to the front face of the front engine mount is impeded
Solution Approach 1:
The patent reverses the installation approach by enabling all critical fastening operations to be performed from the rear face of the mounting plate. The opening sections and guiding elements on the rear face allow shear pins and tension bolts to be inserted and secured without requiring any access to the front face, thus maintaining secure engine mounting while eliminating access problems.
3Productivity
If vertical hoisting is used to position the front engine mount, then the mounting process is simplified, but fitting shear pins and tension bolts becomes difficult due to inaccessibility
Solution Approach 1:
The patent maintains the efficiency benefit of vertical hoisting for positioning the front engine mount while eliminating the subsequent access problem by enabling all fastening operations to be performed from the rear face. The opening sections and guiding elements on the rear face allow shear pins and tension bolts to be fitted without requiring front face access, thus preserving productivity while improving ease of operation.
Data Source
AI summary
An assembly for an aircraft comprising a pylon having a mounting plate having a front face and a rear face and through which there passes, between the front face and the rear face, at least one central bore, a front engine mount comprising a spar with a rear face bearing against the mounting plate front face and which, for each central bore, has a complementary central bore aligned with the central bore, and for each central bore, a mounting system. The mounting system comprises a shear pin inserted into the central bore and the complementary central bore from the rear face with a flange bearing against the rear face, a support with a central hole, the diameter of which is greater than the flange diameter and fixed to the rear face, and a cap fixed to the support closing off the central hole and bearing against the shear pin.