Aircraft Engine Pylon Mounting with Pre-Inserted Shear Pins
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Solution Overview
Problem
The existing method for mounting an aircraft engine onto a pylon is labor-intensive due to the need for precise positioning of shear pins, requiring great accuracy and time, especially when attaching the front engine fastener to the lower face of the pylon, which results in a significant space between the engine and the pylon, affecting aerodynamics.
Innovation Solution
A method that pre-inserts two shear pins into the front engine fastener or the pylon's bores, allowing for attachment to the front face of the pylon, reducing the number of shear pins and simplifying the attachment process by positioning and inserting them before mounting, utilizing a system of ball and socket joints and connecting rods for alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the existing method of attaching the front engine fastener to the lower face of the pylon is used, then secure fastening is achieved, but a significant space between the engine and pylon is created, increasing aerodynamic drag
Solution Approach 1:
The shear pins are pre-inserted into the front engine fastener or pylon bores before the mounting operation. This preliminary action eliminates the need for precise real-time positioning during attachment, reducing mounting complexity while enabling the engine to be positioned closer to the pylon front face, thereby reducing aerodynamic drag.
2Reliability
If precise positioning of shear pins is required during attachment, then secure fastening is ensured, but the mounting process becomes labor-intensive and time-consuming
Solution Approach 1:
Shear pins are pre-inserted into either the front engine fastener or the pylon bores before the mounting operation begins. This preliminary positioning ensures that when the engine is raised and attached, the shear pins are already in place to provide secure fastening, eliminating the need for time-consuming precise positioning during the actual attachment process.
3Reliability
If multiple shear pins are used for attachment, then secure fastening is achieved, but the number of components and mounting complexity increases
Solution Approach 1:
Multiple shear pins are pre-inserted into the front engine fastener or pylon bores before mounting. This preliminary action maintains the security provided by multiple pins while simplifying the overall attachment system, as the pins are already positioned and do not require complex positioning mechanisms or procedures during the actual attachment operation.
Data Source
AI summary
A method for mounting an aircraft engine on a pylon includes positioning at least a first shear pin either in a first opening provided in a front engine fastener which is previously attached to the engine using connecting rods, or in a first bore provided in a front surface of the pylon; prepositioning the assembly including the engine and the front engine fastener relative to the pylon by placing the first shear pin opposite a receiving cavity, the receiving cavity being either the first bore, if the first shear pin has been positioned in the first opening, or the first opening, if the first shear pin has been positioned in the first bore; and inserting the first shear pin into the receiving cavity.