Low-Torsion Bushing Assembly With Slip Lobe Structure
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Solution Overview
Problem
Some bushing assemblies exhibit higher torsional stiffness than desired, which can lead to increased moment and wind-up under torsional loads, necessitating solutions that minimize or eliminate these challenges.
Innovation Solution
A bushing assembly design featuring a body with radially extending lobes, where the third lobe has a lower coefficient of friction than the first and second lobes, allowing for slip under torsional loads and reducing torsional stiffness, includes a configuration where the third lobe is not bonded to the outer tube, enabling relative movement and reducing torsional stiffness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the bushing assembly uses a conventional design with uniform material properties across all lobes, then the structure is simple and easy to manufacture, but the torsional stiffness is higher than desired leading to increased moment and wind-up under torsional loads
Solution Approach 1:
The bushing assembly employs different material properties for different lobes. Specifically, the third lobe uses a material with a lower coefficient of friction compared to the first and second lobes. This local differentiation allows the third lobe to slip under torsional loads, thereby reducing the overall torsional stiffness and moment of the bushing assembly while maintaining structural simplicity in the overall design.
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 design effectively lowers torsional stiffness and moment in bushing assemblies, providing a configuration that mitigates high torsional wind-up by incorporating a friction-modified rubber material for the third lobe, allowing it to slip and reduce the overall torsional resistance.
Implementation Method 1
The third lobe may include a material with a lower coefficient of friction than a material of the first lobe and the second lobe
Data Source
AI summary
A bushing includes a body and a plurality of lobes extending radially outward from the body. The plurality of lobes may include a first lobe, a second lobe, and a third lobe. The third lobe may include a material with a lower coefficient of friction than a material of the first lobe and the second lobe. A bushing assembly may include an inner member, an outer member disposed, and a bushing disposed at least partially between the inner member and the outer member. The bushing may include a first lobe, a second lobe, and a third lobe. The third lobe may include a material with a lower coefficient of friction than a material of the first lobe and the second lobe.