Removable Centring Seat for Aircraft Turbine Engine Assembly
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Solution Overview
Problem
The construction of bosses to accommodate countersunk heads of attachment means in thin-walled components of aircraft turbine machines requires complex and expensive machining techniques, which is inefficient and costly.
Innovation Solution
An assembly comprising a seat with a countersunk bearing surface and abutment means that houses the attachment means' head, allowing it to be positioned independently of the parts to be assembled, thereby avoiding the need for complex machining and enabling secure attachment without projecting beyond the part's thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bosses are constructed in thin-walled parts to accommodate countersunk heads of attachment means, then the attachment means can be securely fixed, but complex and expensive machining techniques are required
Solution Approach 1:
The invention extracts the boss structure from the thin-walled part itself and places it on the attachment means (screw or rivet). The countersunk head of the attachment means serves as the boss, eliminating the need for complex machining of bosses in the thin-walled component. This is achieved by designing the attachment means with an integrated countersunk head that fits into a simple countersunk hole in the thin-walled part.
Solution Approach 2:
Instead of creating bosses in the thin-walled part to receive attachment means, the invention inverts the approach by making the attachment means itself carry the boss structure (countersunk head). The thin-walled part only needs a simple countersunk hole, and the attachment means provides the boss functionality through its own head geometry.
2Reliability
If countersunk heads of attachment means are used to fix parts, then secure attachment is achieved, but the heads cannot fit into the thickness of thin walls
Solution Approach 1:
The invention resolves the thickness constraint by changing the dimensional approach: instead of requiring the countersunk head to fit entirely within the thin wall thickness, the solution allows the head to extend slightly beyond the thin-walled part. The abutment means provides a bearing surface that supports the head, distributing the load and enabling secure attachment despite the limited wall thickness.
Solution Approach 2:
The invention introduces abutment means as an intermediary element between the countersunk head of the attachment means and the thin-walled part. This abutment means provides a bearing surface that supports the head, allowing the attachment to be secure even when the head cannot be fully contained within the thin wall thickness.
3Ease of operation
If bosses are provided in thin-walled parts to hold screw heads, then the screw heads can be accommodated, but expensive and complex machining techniques are required
Solution Approach 1:
The invention extracts the boss functionality from the thin-walled part and relocates it to the attachment means itself. The thin-walled part only requires a simple countersunk hole without the need for complex boss structures, significantly reducing machining complexity and cost while maintaining the ability to accommodate screw heads.
Solution Approach 2:
The attachment means (screw or rivet) serves its own function of providing the boss structure through its countersunk head, eliminating the need for the thin-walled part to provide complex boss structures. The attachment means is self-sufficient in providing the necessary head accommodation.
Data Source
AI summary
A turbine engine for an aircraft which includes, in general, at least one assembly made up of a first part wherein a second part is attached with an attachment device including a milled head applied to the first part and a body engaging with the second part in order to clamp the parts. The recess of the head of such an attachment device requires a boss on the first part, which is complex and expensive to produce using conventional techniques. Such a boss can be replaced with a removable seat having an opening through which the body passes and forming a recess for the head, a bearing surface for the head, and abutment device applied to the first part in order to prevent a movement of the seat towards the second part.