Rear Stator Brake Discs with Shoulder-Notch Assembly
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Solution Overview
Problem
The complex process of renovating and using rear stator-type aircraft brake discs with studs requires multiple disc types and adjustments, leading to increased complexity and costs due to the need for 'thick' and 'thin' front stator discs to match the thickness of rear stator discs in different life cycles.
Innovation Solution
A method involving the machining of friction and rear faces of two discs to create an assembled disc with a shoulder and notch configuration, allowing them to be fixed together and reused as a single 'thick' or 'thin' disc, eliminating the need for multiple disc types and adjustments, thereby simplifying the renovation process and extending the life of the discs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If rear stator discs are reused after wear in a second life, then disc lifetime is extended, but the complexity of the renovation process increases due to the need to match disc thicknesses with front stator discs
Solution Approach 1:
The rear stator disc is segmented into two separate discs that are machined and assembled together. The first disc is machined to have a shoulder on its friction face, and the second disc is machined to have a corresponding notch. This segmentation allows each disc to be optimized independently while maintaining the required thickness for the second life, thereby extending disc lifetime without increasing renovation complexity.
Solution Approach 2:
The two machined discs are assembled in a nested configuration where the first disc with the shoulder fits into the second disc with the notch, creating a compact assembled disc that mimics the original single disc geometry. This nesting approach allows the renovated assembly to fit within the original disc space constraints while extending the usable life of the rear stator disc.
2Adaptability or versatility
If multiple types of front stator discs are maintained to match rear stator disc thicknesses, then adaptability is improved, but inventory complexity and costs increase
Solution Approach 1:
The assembled disc configuration provides universal adaptability because the two-disc assembly can be machined to match any required thickness specification. Rather than maintaining multiple types of front stator discs, the renovation process can produce a standardized assembled disc that adapts to different thickness requirements through controlled machining of the shoulder and notch features, thereby reducing inventory complexity while maintaining adaptability.
Solution Approach 2:
The invention changes the approach from selecting from pre-existing disc types to actively controlling the thickness parameter through machining operations. By machining the friction face of the first disc and the rear face of the second disc to specific dimensions, the assembled disc can be precisely tailored to match any required thickness, eliminating the need to maintain multiple disc types in inventory.
3Quantity of substance
If the initial thickness of rear stator discs is reduced to lower costs, then manufacturing costs decrease, but the number of renovation cycles required increases
Solution Approach 1:
The invention applies preliminary machining actions to the two separate discs before assembly. The friction face of the first disc and the rear face of the second disc are machined in advance to create the shoulder and notch features and to establish the precise thickness dimensions. This preliminary action ensures that the assembled disc achieves the correct thickness from the start, allowing it to complete a full second life cycle without requiring additional intermediate renovations, thereby offsetting the increased renovation frequency that would result from using thinner initial discs.
Data Source
AI summary
The invention is a method for refurbishing and using rear stator-type brake discs with studs, the method comprising the steps of using a first disc (12) during a first life, using a second disc (112) during a first life, after the first life of the first disc and the first life of the second disc, machining a rubbing face of one of the discs and a rear face of the other disc so that one of said faces has at least one shoulder (17) and the other of said faces has at least one notch (118), fitting the first disc into the second disc so that the notch and the shoulder cooperate to center the discs.