Bronze Bushing Structure for Low Friction and Axial Load
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Solution Overview
Problem
Existing bushings face issues with friction, wear, and strength, particularly when subjected to axial loads, which limits their load-bearing capacity and lifespan.
Innovation Solution
A bronze alloy bushing with a porous bronze layer impregnated with a low-friction polymer, such as PTFE, and a topical polymer layer, combined with a flange for axial load bearing, is developed. The bronze alloy comprises 1-15% aluminum, 1-10% iron, and 3-10% nickel, providing increased yield strength and wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a porous bronze layer with impregnated polymer is used, then friction is reduced and wear resistance is improved, but axial load bearing capacity is insufficient
Solution Approach 1:
The bushing is divided into functionally distinct segments: a flange portion for axial load bearing and a cylindrical portion with porous bronze and polymer layers for friction reduction. This segmentation allows each part to optimize its specific function without compromise.
Solution Approach 2:
The bushing combines multiple materials with complementary properties: bronze backing layer for structural strength, porous bronze for polymer retention, and polymer layers for low friction. The flange uses a bronze alloy composite (Cu-Al-Fe-Ni) that integrates strength and wear resistance.
2Ease of manufacture
If existing bushing structures are used, then manufacturing is simpler, but yield strength and lifespan are limited
Solution Approach 1:
The bronze alloy composition parameters are optimized with specific ranges (1-15% Al, 1-10% Fe, 3-10% Ni) to achieve enhanced yield strength while maintaining manufacturability through conventional casting or sintering processes.
3Force
If a flange is added for axial load bearing, then load capacity increases, but device complexity increases
Solution Approach 1:
The flange is designed to serve multiple functions: axial load bearing, structural support, and integration with the porous bronze layer to provide a unified component that reduces the need for additional separate parts.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The bushing exhibits reduced friction, enhanced load-bearing capacity, and extended lifespan, with improved wear resistance and yield strength, making it suitable for high-load and high-temperature applications like the aviation industry.
Implementation Method 1
An impregnated polymer is provided in the porous bronze layer
Implementation Method 2
the bronze backing layer comprises 1-15% aluminium, 1 to 10% iron, and 3 to 10% nickel
Data Source
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Figure 5
AI summary
A bushing includes a bronze backing layer having a first axial end, a second axial end, and a central opening, the bushing having a cylindrical shape and a porous bronze layer. PTFE or other suitable low friction material is impregnated into the porous bronze layer at one of a radially inner or outer surface of the bushing. A PTFE or other suitable low friction material topical layer is disposed adjacent the impregnated layer. The bushing may optionally comprise a flange which also includes the bronze backing layer, the porous bronze and impregnated layer, and the topical layer on an axially inner or outer surface.