Relief-Zone Bushing Geometry for Edge Load Wear Reduction
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Solution Overview
Problem
Traditional bushings with uniform inner diameters concentrate stress on the edges, leading to excessive wear and potential failure of the parent part, particularly in aircraft components like rotor mounts, due to end loading and elastic deformation during operation.
Innovation Solution
Incorporating edge relief zones into the bushing design, where the inner diameter is greater than the central diameter, helps distribute the load more evenly and reduces stress concentrations on the parent part, thereby extending its service life without adding weight or requiring redesign.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bushing with uniform inner diameter is used, then the structure is simple and easy to manufacture, but stress concentrates on the edges leading to excessive wear and potential failure
Solution Approach 1:
The bushing is designed with different inner diameters in different zones: a larger inner diameter in the relief zones at the ends and a smaller inner diameter in the central portion. This local variation in geometry redistributes the load from the edges to the central area, reducing stress concentration on the parent part while maintaining structural integrity.
2Reliability
If edge relief zones are incorporated into the bushing design, then stress distribution is improved and wear is reduced, but the manufacturing process becomes more complex
Solution Approach 1:
The bushing design varies the inner diameter parameter along its length, creating distinct zones with different dimensions. The relief zones have a larger inner diameter than the central portion, which changes the stress distribution pattern and reduces edge loading on the parent part while maintaining ease of manufacturing through standard machining or molding processes.
Data Source
AI summary
There is disclosed in one example a mechanical assembly, including: a parent part including a parent part lug; a bushing to pass through the lug, the bushing comprising a central inner diameter, and respective left and right relief zones having a second inner diameter different from the central inner diameter; and a through-pin to pass through the bushing.