Rail Coupling Bush for Electrical Insulation and Torque Limiting
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Solution Overview
Problem
Existing torque-transmitting couplings in rail applications lack both electrical insulation and effective torque limitation, leading to complex constructions and potential overheating issues during torque overload.
Innovation Solution
A coupling design featuring a bush made from high-performance plastics material, which provides electrical insulation and torque limitation by being located in the axial hub portion of the coupling, with a through-hole forming a radial step for enhanced structural integrity and wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coupling is designed to provide both electrical insulation and torque limitation, then the coupling's functional reliability is improved, but the construction complexity increases
Solution Approach 1:
The patent combines electrical insulation and torque limitation functions into a single integrated bush component. The bush is made from electrically insulating material and incorporates a radial step that acts as a torque limitation element, eliminating the need for separate insulation components and torque limitation devices.
Solution Approach 2:
The bush serves multiple functions simultaneously: it provides electrical insulation between the hub portion and the shaft, acts as a torque limitation element through its radial step, and serves as a mounting feature for the shaft. This multi-functionality reduces the overall number of components needed in the coupling.
2Reliability
If a bush made from high-performance plastics material is used, then electrical insulation and torque limitation are achieved, but manufacturing precision requirements increase
Solution Approach 1:
The radial step in the through-hole creates a localized feature that concentrates the torque limitation function in a specific area. This local geometric variation allows the bush to provide torque limitation without requiring high precision throughout the entire component, as only the radial step geometry needs to be controlled.
3Strength
If the through-hole forms a radial step, then structural integrity and wear resistance are enhanced, but the device complexity increases
Solution Approach 1:
The radial step in the through-hole combines multiple functions: it provides torque limitation by acting as a mechanical stop, enhances wear resistance by creating a bearing surface, and improves structural integrity by distributing loads. This integration of multiple functions into a single geometric feature avoids the need for additional components.
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 coupling achieves rotational rigidity, efficient torque transmission, and effective torque limitation while maintaining electrical insulation, with the high-performance plastics bush ensuring durability and reduced maintenance needs.
Implementation Method 1
a bush which comprises an electrically non-conductive high-performance plastics material
Implementation Method 2
the bush is sacrificial and can be replaced independently of the coupling in the event of wear, wherein the bush is adapted to the stepped shape of the through-hole with the externally circumferential contour of the bush complementing the stepped shape of the through-hole
Data Source
AI summary
A coupling for connection between a first shaft and a second shaft includes a first coupling portion designed for connection to the first shaft, a second coupling portion connected to the first coupling portion for transmitting a drive torque and designed for connection to the second shaft, and a bush accommodated in a through-hole of an axial hub portion of at least one of the first and second coupling portions and made of an electrically non-conductive high-performance plastics material, for receiving the first shaft or second shaft associated with the at least one of the first and second coupling portions, wherein the through-hole has an internal circumference formed with a radial step.