Shaft-Hub Connection with Elastic Bushing for Misalignment
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Solution Overview
Problem
Shaft-hub connections face challenges with alignment differences and wear due to misalignment, which lead to increased wear and corrosion, particularly contact corrosion, and require high insertion forces.
Innovation Solution
A shaft-hub connection design featuring a bushing with an elastically deformable region, facilitated by a transition region with a gradually increasing diameter, which compensates for misalignment and establishes a friction-locked connection, using a thinner wall region or radial protuberance, and made of materials like Teflon to reduce corrosion and allow for cost-effective production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a shaft is directly connected to a mounting part, then the connection is simple, but alignment differences cause wear and corrosion
Solution Approach 1:
A bushing is introduced as an intermediary component between the shaft and the mounting part. The bushing includes an elastically deformable region that can flex to accommodate alignment differences between the shaft axis and mounting part axis, thereby preventing direct contact and reducing wear and corrosion while maintaining a relatively simple connection structure.
2Reliability
If a bushing with elastically deformable region is used, then wear and corrosion are reduced, but insertion force increases
Solution Approach 1:
The bushing wall thickness is varied locally: the region adjacent to the mounting part has a smaller wall thickness to facilitate easy insertion, while the axial terminal region has a larger wall thickness to provide the necessary elastic deflection capability. This local variation in quality allows the bushing to be inserted with low force while still providing wear and corrosion protection through elastic deformation.
3Force
If a thinner wall region is provided in the bushing, then insertion force is reduced, but structural strength decreases
Solution Approach 1:
The bushing is designed with non-uniform wall thickness where the region adjacent to the mounting part has smaller thickness for easy insertion, while the axial terminal region has larger thickness to maintain structural strength and provide elastic deflection. This local differentiation allows the bushing to be both easy to insert and sufficiently strong for its function.
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 solution effectively compensates for axial and circumferential misalignments, reduces wear and corrosion, and enables high torque transmission with lower initial insertion forces, while maintaining a strong, friction-locked connection.
Implementation Method 1
a bushing being provided between the shaft and mounting part, the bushing having an axial region, in particular an axial terminal region, which is elastically deflectable by the transition region
Implementation Method 2
a friction-locked connection to be established between the bushing and mounting part
Data Source
AI summary
In a connection of a shaft to a mounting part, in particular a shaft-hub connection, the shaft has a first axial region which is able to be accommodated in the mounting part, the shaft has an additional axial region which has a larger diameter than in the first axial region, a transition region is provided between the first and additional axial region, whose diameter increases in the axial direction from the first to the additional axial region, from the value of the diameter of the first axial region to the value of the diameter of the additional axial region, in particular not exclusively abruptly, a bushing is provided between the shaft and the mounting part, the bushing having an axial region, in particular an axial terminal region, which is elastically deflectable by the transition region such that it is pressed against the wall of the mounting part, in particular when the shaft is inserted into the mounting part.