Railway Truck Brake Rigging Offset Pivotal Connection
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Solution Overview
Problem
Existing brake riggings for railway vehicles face challenges in accommodating truck bolsters of various configurations and changing force ratios while maintaining efficient engagement with wheel treads, often resulting in complex and costly modifications.
Innovation Solution
A brake rigging design featuring offset pivotal connections of force-transmitting members relative to horizontal planes defined by transfer levers, utilizing a flange and link arrangement with an elongated tab and slot, and J-shaped links to adapt to different bolster clearances and enhance force distribution, allowing for simple and economical modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional brake rigging designs are used, then the structure is simple, but the adaptability to various bolster configurations is poor
Solution Approach 1:
The patent introduces a vertical offset dimension to the pivotal connection of the force-transmitting member. Instead of connecting in the same horizontal plane as the transfer lever, the connection point is positioned at a vertical distance above or below this plane. This dimensional change enables the brake rigging to accommodate various bolster configurations and clearances without requiring complex structural modifications.
2Object-affected harmful factors
If the pivotal connection is in the same plane as the transfer lever, then the structure is simple, but undesirable force moments are generated on brake shoes
Solution Approach 1:
By positioning the pivotal connection of the force-transmitting member at a vertical offset from the horizontal plane of the transfer lever, the invention changes the geometric relationship between components. This dimensional adjustment modifies the force transmission path, eliminating undesirable force moments that would otherwise be generated on the brake shoes during braking operation.
3Adaptability or versatility
If standard brake rigging designs are used, then manufacturing is straightforward, but modification of force ratios is difficult
Solution Approach 1:
The invention segments the force transmission system by introducing a separate force-transmitting member with its own pivotal connection points. This segmentation allows the force ratio to be independently adjusted by modifying the position of the pivotal connection on the force-transmitting member, without requiring changes to the entire brake rigging structure, thereby facilitating easy modification while maintaining manufacturing simplicity.
Data Source
AI summary
A railway vehicle truck mounted brake rigging includes spaced apart first and second brake beams, a horizontally disposed first transfer lever having a pivotal connection with one brake beam and further having an upturned flange, a link seated horizontally on the shoulder, a horizontally disposed second transfer lever having a pivotal connection with another brake beam, a first force-transmitting member passing through the first opening of the bolster for pivotal connection with each of the link and the second transfer lever, the pivotal connection is offset in a vertical direction from a horizontal plane defined by the first transfer lever, and a second force-transmitting member passing through the second opening of the bolster for pivotal connection with opposed ends of the respective first and second transfer levers.