Rail Vehicle Coupling Bolt Elastic Bearing Alignment
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Solution Overview
Problem
Conventional rail vehicle couplings with spheroidal bearings require precise alignment of bores for bolt insertion, making maintenance complex and difficult due to tight tolerances, especially when the bolt penetrates the ball joint.
Innovation Solution
A rail vehicle coupling design featuring a horizontally oriented bolt connected to a joint fork via elastic bearing rings, allowing for insertion even with minor misalignments, using a three-part elastic bearing ring with conical bores and clamping caps to secure the bolt position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a coupling system with a single lubrication point is used, then the lubrication system is simple and cost-effective, but the journal bearings require frequent manual intervention and have limited service life
Solution Approach 1:
The lubrication system is segmented into multiple independent lubrication points (at least three) distributed along the coupling body, each capable of receiving lubricant independently. This segmentation allows continuous lubrication without requiring system shutdown or manual intervention, resolving the contradiction between simplicity and reliability.
Solution Approach 2:
The coupling incorporates a self-lubricating mechanism where lubricant is automatically supplied to multiple bearing journals through integrated lubrication points and channels. The system performs self-maintenance by continuously delivering lubricant without external intervention, eliminating the need for manual greasing and extending service life while maintaining reliability.
2Device complexity
If manual lubrication intervention is required frequently, then the lubrication system remains simple, but the coupling requires system shutdown and loses productivity
Solution Approach 1:
The lubrication system is designed to provide continuous lubrication to all journal bearings throughout operation. Multiple lubrication points with integrated supply channels ensure uninterrupted lubricant delivery, eliminating downtime for manual lubrication and maintaining continuous productivity without increasing system complexity.
Solution Approach 2:
Lubricant is pre-positioned and automatically delivered to each bearing journal before wear occurs. The system incorporates preliminary lubrication action through integrated channels that supply lubricant proactively, preventing the need for reactive manual intervention and maintaining continuous operational productivity.
3Reliability
If multiple lubrication points are implemented, then the service life and reliability improve, but the device complexity and cost increase
Solution Approach 1:
Multiple lubrication points and their supply channels are merged into a single integrated coupling body structure. The lubrication system is combined with the coupling housing, eliminating the need for separate external lubrication components and reducing overall system complexity while providing reliable multi-point lubrication.
Solution Approach 2:
The coupling body serves multiple functions: it provides structural support, transmits torque, and integrates the lubrication system with multiple supply points. This multi-functionality consolidates what would otherwise be separate systems into a single universal component, improving reliability without proportionally increasing complexity.
4Device complexity
If conventional coupling systems are used, then the design is simple, but misalignment and vibration occur leading to premature failure
Solution Approach 1:
The coupling incorporates flexible elements that allow dynamic adaptation to misalignment between shafts. The flexible coupling design accommodates angular and parallel misalignment dynamically during operation, reducing vibration and preventing premature failure without requiring complex rigid alignment systems.
Data Source
Figure 1~2
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Figure 4
AI summary
Railway vehicle coupling (1) for connecting two railway vehicles, comprising a joint eye (2) designed for detachable connection with one of the two railway vehicles and a joint fork (3) designed for detachable connection with the other of the two railway vehicles, as well as a horizontally oriented bolt (4) which can be connected to the joint fork (3) and which penetrates a spheroidal bearing (5) connected to the joint eye (2), wherein each end of the bolt (4) is connected to the joint fork via an elastic bearing ring (6).