Aircraft Wheel Drive Key Offset Design for Mass Reduction
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Solution Overview
Problem
Aircraft wheel brake systems face challenges with existing strip designs that increase wheel size and weight due to protruding tenons and large fixing bolts, complicating machining and increasing mass.
Innovation Solution
A bar with an oblong body and offset end pieces is designed, where one end piece fits into a disc orifice and the other end piece, offset and non-protruding, fits into a radial orifice in the rim, allowing the bar to be securely fixed with a smaller nut or bolt, reducing the wheel's size and mass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a bar with protruding ends carrying large fixing bolts is used, then the braking force can be taken up, but the wheel size increases and mass increases
Solution Approach 1:
The invention changes the spatial arrangement by offsetting the end pieces along the longitudinal axis of the bar rather than having them at opposite ends. This dimensional repositioning allows the bar to fit within the wheel's internal volume without protruding externally, eliminating the need for large fixing bolts while maintaining braking force capacity through proper force distribution along the bar structure.
Solution Approach 2:
The bar with offset end pieces is nested within the internal volume of the wheel structure, specifically utilizing the space between the rim and the brake disc mounting surface. This nesting approach allows the bar to be fully contained within the wheel's internal geometry, eliminating external protrusions and reducing the need for oversized fastening components.
2Reliability
If the second orifice is formed in a part of the rim projecting towards the outside, then the bar can be fixed, but the size of the wheel increases
Solution Approach 1:
The invention repositions the second orifice from a radial projection towards the outside of the wheel to a location on the inner face of the rim, accessible from the internal volume. This dimensional change in orifice placement allows the bar to be securely fixed within the wheel's internal geometry without increasing the wheel's external dimensions.
Data Source
Figure 1~3
Figure 4~5
AI summary
The invention relates to a wheel bar (1) for an aircraft wheel, comprising an oblong body (2) extended on either side by two ends (4, 5) extending parallel to the body and parallel to each other, offset from one another. The invention also relates to a wheel (10) specially adapted to receive such a wheel bar.