Modular Earthing Contact Assembly for Lower-Cost Brush Holders
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Solution Overview
Problem
The production of traditional grounding contacts for railway technology is complex and costly due to the need for high machining volumes and non-standardized brush shafts, leading to increased tool costs and reduced manufacturing efficiency.
Innovation Solution
A modular grounding contact design featuring a separately manufactured base plate and brush shaft, utilizing laser and water jet cutting processes to reduce metal removal volume and eliminate the need for complex casting tools, with a positive connection between the base plate and brush shaft allowing for standardization and easy assembly without additional fasteners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional casting and machining processes are used to produce brush shafts, then the structural integrity is maintained, but the manufacturing cost increases and production time extends
Solution Approach 1:
The brush holder is divided into two separate components: a base plate and a brush shaft. The base plate can be produced by casting or pressing, while the brush shaft is manufactured separately using laser or water jet cutting. This segmentation eliminates the need for complex internal cavity machining in the brush shaft, significantly reducing manufacturing costs and production time while maintaining structural integrity through the positive connection between components.
2Productivity
If brush shafts are customized for each base plate design, then the specific application requirements are met, but standardization is lost and production efficiency decreases
Solution Approach 1:
The brush shaft is designed as a standardized component with universal dimensions (e.g., 40x20 mm or 32x12.5 mm) that can be used across different base plate designs. The positive connection system with standardized receptacles allows the same brush shaft to fit multiple base plate configurations, enabling mass production of standardized brush shafts while maintaining adaptability to various applications through the modular base plate designs.
3Ease of operation
If the brush shaft is integrated with the base plate as a single component, then assembly is simplified, but machining volume increases and tool costs rise
Solution Approach 1:
The brush shaft and base plate are produced as separate components. The base plate contains a recess or receptacle that receives the brush shaft, which is then secured through a positive connection system (such as interference fit, key-way, or snap-fit). This approach eliminates the need to machine complex internal cavities in the brush shaft, reducing metal removal volume by approximately 70-80% compared to integrated designs, while assembly remains simple through the designed positive connection mechanism.
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to an earthing contact for the controlled guiding of electric current, comprising a brush holder (2), wherein the brush holder (2) has a baseplate (3) and at least one brush shaft (4) for accommodating a brush (6), and wherein the at least one brush shaft (4) is connected to the baseplate (3) in a positively locking manner.