Aircraft Engine Mount Pin Attachment Design
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Solution Overview
Problem
Existing aircraft engine attachment designs face difficulties in accessing and installing pins due to increasing compactness, leading to cost and time penalties, especially in densely occupied environments with limited access.
Innovation Solution
The engine attachment features a plate assembly with a pin supported by a ring acting as a stop, eliminating the need for special fixing means at one end of the pin, and includes a nut and locking nut arrangement with a spring-washer to prevent overtightening, along with a safety rod and optional ball joint for secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the engine assembly is made more compact to reduce space occupation, then the volume and space requirements are reduced, but the access to pin ends becomes increasingly difficult
Solution Approach 1:
The invention extracts the problematic feature (the need to access both ends of the pin) by eliminating one end fitting entirely. The pin is inserted through only one arm of the clevis and secured with a single end fitting, removing the second end fitting that caused access difficulties. This allows compact engine assembly design while maintaining easy access to the single pin end that requires adjustment.
Solution Approach 2:
Instead of the traditional symmetric design with end fittings at both ends of the pin, the invention inverts the approach by placing the end fitting at only one end. This asymmetric configuration reverses the conventional wisdom while solving the access problem - the pin end that needs to be accessed for adjustment is the one with the end fitting, while the other end is simply inserted through the clevis arm.
2Reliability
If special fixing means are provided at both ends of the pin to secure it in the end fitting, then the reliability of the attachment is improved, but the device complexity and installation difficulty increase
Solution Approach 1:
The invention removes one end fitting from the design, extracting the source of complexity. Instead of providing special fixing means at both ends of the pin, only one end fitting is used. This reduces the number of components and simplifies the assembly process while maintaining sufficient reliability through the single secured end.
Solution Approach 2:
The invention merges the functions of the two end fittings into a single end fitting. The one end fitting performs the securing function that would traditionally require two separate end fittings, thereby reducing device complexity while maintaining the necessary attachment reliability through proper design of the single fitting.
Data Source
AI summary
An aircraft engine attachment configured to be inserted between an engine and an EMS, the attachment including a plate assembly connected to a first fixing device including an end fitting with two arms and a pin passing through the plate assembly and the two arms, in each of which an orifice is formed including a first ring and a second ring respectively holding the pin. The first ring includes a bottom acting as a stop for a first end of the pin, and the first attachment device includes a mechanism to stop the pin in translation cooperating with a second end of the pin.