Dual-Layered Bushing Structure for Shaft Misalignment and Torque Load
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Solution Overview
Problem
Existing bushings for aligning rotatable shafts face limitations such as torque-induced failure, excessive wear due to misalignment, and delamination from high operating temperatures, leading to premature failure and costly repairs.
Innovation Solution
A dual-layered bushing design featuring a cylindrical sleeve with parallel grooves and a cylindrical outer tube, both made of compressively resilient materials, which mate securely to prevent separation and absorb vibrations, allowing for flexibility and resilience during shaft rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single-layer rubber bushing is used to provide flexibility and vibration absorption, then the bushing can accommodate shaft misalignment, but the rubber layer gets squashed under torque and causes bushing and coupling failure
Solution Approach 1:
The bushing uses a composite structure with an inner rubber layer and an outer polymeric layer. The rubber layer provides flexibility and vibration absorption, while the outer polymeric layer provides torque resistance and structural support. This composite material approach allows the bushing to simultaneously achieve both flexibility and high torque capacity without the rubber layer being squashed under load.
2Temperature
If a rubber layer is used to provide compressive resilience, then the bushing can absorb vibrations, but the rubber layer delaminates from the insert layer at high operating temperatures
Solution Approach 1:
The bushing replaces the traditional rubber layer with a thermally stable polymeric layer that does not delaminate at high temperatures. The outer polymeric layer is specifically selected to provide both thermal stability and bonding strength to the insert layer, eliminating the delamination problem that occurs with rubber at elevated temperatures while maintaining vibration absorption capabilities.
3Strength
If the bushing is made rigid to increase torque capacity, then the bushing can withstand higher loads, but the bushing cannot accommodate shaft misalignment and experiences excessive wear
Solution Approach 1:
The bushing employs a composite structure where the inner rubber layer maintains compressive resilience to accommodate shaft misalignment and reduce wear, while the outer polymeric layer provides the necessary rigidity and torque capacity. This layered composite approach allows the bushing to simultaneously achieve high torque capacity and wear resistance by assigning different functional properties to different layers.
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 dual-layered bushing effectively reduces wear and tear, maintains alignment, and extends the service life of shaft couplings by absorbing rotational vibrations and maintaining structural integrity under varying temperatures.
Implementation Method 1
a compressively resilient bushing, which for this invention is defined as a bushing having the ability to recover its size and shape after elastic deformation caused by compressive stress
Data Source
AI summary
A compressively resilient, dual layered bushing useful for aligning shafts and couplings and adjusting shaft misalignment. It has a cylindrical sleeve with an outer wall, and a hollow core defining an inner wall extending from a top to a bottom of the cylindrical sleeve. The cylindrical sleeve comprises a first compressively resilient material and has separated, parallel grooves through the outer wall around its circumference. A cylindrical outer tube is attached around the outer wall of the cylindrical sleeve from the top to the bottom. The outer tube has a smooth outer wall and an inner wall having separated parallel projections extending outwardly around the inner wall of the outer tube. The projections are attached to and mate with the grooves through the outer wall around the cylindrical sleeve. The cylindrical outer tube and the projections comprise a second different compressively resilient material.