Aircraft Turbomachine Intake Cone Tip Attachment Stud Bolt System
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Solution Overview
Problem
The existing attachment means for the cone tip on aircraft turbomachines, which utilize self-locking threads, lose their locking capacity after several assembly/disassembly cycles, requiring frequent replacement and causing operational inefficiencies, especially during regular maintenance tasks like battery recharging during test phases.
Innovation Solution
The design incorporates attachment stud bolts with a clamping nut system and an anti-rotation ring, allowing the cone tip to be withdrawn while the stud bolts remain attached to the interior support, eliminating the need for self-locking thread replacement and simplifying frequent extractions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If self-locking threads are used for attachment means, then the screws remain locked in the vibrating environment, but the self-locking capacity is lost after several assembly/disassembly cycles
Solution Approach 1:
The attachment means are divided into two distinct parts: stud bolts that remain permanently installed in the interior support, and clamping nuts that are removed and replaced. This segmentation allows the stud bolts to maintain their locking function indefinitely while the clamping nuts can be freely exchanged without affecting the locked state.
Solution Approach 2:
Instead of having the threaded fasteners (screws) remain installed and lose their locking capacity over time, the invention inverts the approach by having the stud bolts remain installed permanently while the clamping nuts are the removable component. This reverses the traditional role of the fastener, allowing the locking function to be maintained indefinitely.
2Reliability
If self-locking threads are replaced regularly, then locking capacity is maintained, but specific tooling and disassembly operations are required increasing time consumption
Solution Approach 1:
The clamping nuts are extracted as separate, removable components from the attachment means. This allows them to be independently replaced without requiring disassembly of the entire attachment system or specialized tooling, significantly reducing the time and complexity of maintenance operations.
3Ease of operation
If cone tip is extracted frequently for battery recharging, then equipment maintenance is performed, but self-locking threads must be replaced causing operational inefficiencies
Solution Approach 1:
The attachment system is designed to be dynamically adaptable: the stud bolts remain permanently installed to maintain locking capacity, while the clamping nuts can be freely removed and replaced to enable frequent extraction of the cone tip for battery recharging. This dynamic design allows frequent maintenance operations without the need to replace the entire attachment means.
Data Source
AI summary
The invention relates to a rotating front part of an aircraft turbomachine intake comprising bolts for attaching a cone tip to an internal support, each bolt comprising a rear end that is screwed into the support and a front end that receives a clamping nut, a rotation-prevention portion of non-circular cross section of each bolt engaging with a hole of corresponding cross section of a rotation-prevention ring. Also provided are extraction bolts, of which a rear end is screwed into the filling piece, each bolt passing through a cone tip flange. Finally, the invention is configured such that, after removal of the nuts, forward tension on the bolts allows the removal of an assembly comprising the tip and the filling piece, while keeping the bolts screwed to the support.