Rail Vehicle Grounding Through Corrosion-Resistant Bolted Contacts
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Solution Overview
Problem
Existing rail vehicles face issues with unreliable and vulnerable grounding due to removable grounding cables, which can be stolen, leading to potential safety hazards and maintenance challenges.
Innovation Solution
Utilize existing contact surfaces on the rail vehicle's frame and superstructure for grounding by integrating corrosion-resistant contact elements made of materials like aluminum or copper alloys, eliminating the need for separate grounding cables and ensuring reliable electrical conductivity through bolted connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If grounding cables are used to connect superstructure to frame, then grounding reliability is improved, but vulnerability to theft and removal increases
Solution Approach 1:
The patent merges the grounding function with the structural fastening function by making the bolts themselves electrically conductive. The bolts serve dual purposes: mechanically fastening the superstructure to the frame and providing the grounding path. This eliminates separate grounding cables that could be stolen, while maintaining reliable grounding through the integrated conductive bolts.
Solution Approach 2:
The bolts are designed to perform multiple functions simultaneously: structural fastening and electrical grounding. By making the fastening elements electrically conductive, the patent creates a multi-functional component that eliminates the need for separate grounding cables, thereby preventing theft while maintaining grounding reliability.
2Reliability
If grounding cables with large cross-sections are used, then grounding effectiveness is improved, but device complexity and maintenance requirements increase
Solution Approach 1:
The patent combines the grounding path with the existing structural fastening system. Instead of adding separate grounding cables with large cross-sections, the grounding function is integrated into the bolts already present in the structure. This eliminates additional components and simplifies the overall grounding system while maintaining effectiveness through the conductive path provided by the bolts.
Solution Approach 2:
The patent extracts the grounding function from separate grounding cables and integrates it into the structural bolts. By removing the need for dedicated grounding cables and their associated lugs, clamps, and connection points, the system complexity is reduced while the grounding effectiveness is maintained through the conductive bolts.
3Reliability
If separate grounding components are added, then grounding reliability is improved, but manufacturing complexity and assembly steps increase
Solution Approach 1:
The patent merges the grounding function with the structural fastening function by making the bolts electrically conductive. This integration means that the same components used for mechanical assembly also provide the grounding path, eliminating the need for separate grounding components and reducing manufacturing complexity.
Solution Approach 2:
The bolts are designed to perform multiple functions simultaneously: structural fastening and electrical grounding. This multi-functionality eliminates the need for separate grounding components, simplifying both manufacturing and assembly processes while maintaining grounding reliability.
4Duration of action of stationary object
If corrosion-resistant materials are used for contact elements, then durability is improved, but material cost increases
Solution Approach 1:
The patent employs composite material construction where aluminum or copper alloys (corrosion-resistant and electrically conductive) are used for the contact elements of the bolts. These materials provide both the required electrical conductivity for grounding and resistance to corrosion, ensuring long-term durability without requiring separate protective measures or more expensive materials.
Solution Approach 2:
The patent changes the material parameters of the bolts by using aluminum or copper alloys instead of traditional steel. These materials offer superior corrosion resistance and adequate electrical conductivity for grounding purposes, improving durability while managing material costs through appropriate material selection.
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
Provides secure, corrosion-resistant, and vandal-proof grounding without additional assembly steps, enhancing safety and reducing maintenance needs while maintaining electrical conductivity.
Implementation Method 1
contact surfaces are held in an electrically conductive contact by means of the bolts
Implementation Method 2
contact elements are pressed together in an electrically conductive manner by means of bolts
Data Source
Figure 1
AI summary
In a rail vehicle (1) designed to travel on rails, comprising a frame (3), a chassis held on the frame (3), and a component or assembly designated as the superstructure (2) which is mechanically fastened to the frame (3) by means of bolts (5), wherein contact surfaces are provided in the area of the bolts (5) at which the superstructure (2) contacts the frame (3), and wherein the superstructure (2) is electrically connected to the frame (3) in such a way that the superstructure (2) is grounded via the frame (3), the chassis and the rails, the invention proposes that contact elements made of an electrically conductive, corrosion-resistant material are arranged in the area of the contact surfaces on both the superstructure (2) and the frame (3) in such a way that the contact elements are electrically pressed together by means of the bolts (5), wherein the contact elements connect electrically to the superstructure (2) or frame (3).