Aircraft Turbomachine Reducer Assembly for Planet Pinion Alignment
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Solution Overview
Problem
Existing mechanical reducers for aircraft turbomachines face challenges in ensuring precise alignment of planet pinions, leading to potential misalignment and uneven load distribution during operation, which can result in cumbersome designs or operational failures.
Innovation Solution
A method involving marking specific teeth on central and planet pinions to facilitate precise angular positioning during assembly, ensuring uniform load distribution by aligning marked teeth on the central pinion with those on the planet pinions, thereby maintaining sufficient clearance and distributing loads uniformly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional assembly methods without precise marking are used, then assembly process is simpler and faster, but alignment precision of planet pinions deteriorates leading to misalignment and uneven load distribution
Solution Approach 1:
The patent applies preliminary action by marking specific teeth on planet pinions and the outer crown before the assembly process. These markings are prepared in advance to guide the precise angular positioning during assembly, ensuring that planet pinions are correctly aligned with the outer crown teeth without requiring complex alignment procedures during actual assembly.
Solution Approach 2:
The patent uses marking indicators as an intermediary element between the planet pinions and the outer crown. These markings serve as a mediating reference system that facilitates precise alignment without requiring direct complex measurements or adjustments between the mechanical components themselves during assembly.
2Reliability
If precise alignment marking methods are implemented, then load distribution uniformity improves, but manufacturing and assembly complexity increases
Solution Approach 1:
The marking of teeth on planet pinions and outer crown is performed as a preliminary action during manufacturing, before assembly. This allows the markings to be integrated into the manufacturing process flow without requiring additional complex steps during assembly, thereby improving reliability while minimizing the impact on manufacturing ease.
Solution Approach 2:
The patent applies local quality by marking only specific teeth (N teeth on planet pinions and N pairs of teeth on outer crown) rather than all teeth. This selective marking approach ensures sufficient precision for load distribution uniformity while keeping the manufacturing process simple and focused on critical locations only.
3Reliability
If angular positioning precision is increased through marking, then operational reliability improves, but assembly time and process complexity increase
Solution Approach 1:
The markings are applied as a preliminary action during the manufacturing phase, before the assembly process. This timing allows the markings to be prepared in advance using standard manufacturing techniques, so that during assembly, workers only need to follow the pre-established marking guidelines, significantly reducing the time and complexity of the actual assembly operation.
Solution Approach 2:
The patent focuses markings on specific critical teeth (N teeth and N pairs of teeth) rather than all teeth throughout the mechanism. This localized approach ensures operational reliability by precisely positioning the critical load-bearing interfaces, while minimizing the total number of markings and reducing the time required for the marking and assembly process.
Data Source
AI summary
A method for manufacturing a mechanical reducer for an aircraft turbomachine including a central pinion, an outer crown, N planet pinions, where N≥3, each planet pinion including a first stage meshing with the central pinion, and a second stage meshing with the outer crown, the method including the assembly marking, wherein N teeth of the central pinion are marked, and N pairs of teeth of the first stage of each planet pinion are marked, the N planet pinions each being marked identically, and the assembly of the mechanical reducer, so that the teeth of the pairs of marked teeth of the first stage of each planet pinion are disposed on either side of a marked tooth of the central pinion.