Rotatable Plate Linkage for Railway Vehicle Coupling
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Solution Overview
Problem
Existing linkage devices for railway vehicles fail to effectively dampen compressive and tensile forces during coupling due to rigidly clamped spring elements, which prevents them from mimicking steering movements and results in uneven loading, affecting damping efficiency.
Innovation Solution
A rotatable plate integrated with pivot pins and annular discs allows the drawbar and spring elements to deflect in both horizontal and vertical planes, with spring elements positioned to dampen forces in both directions, and supported by spacer discs for optimal damping, and includes overload protection features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spring elements are clamped rigidly to the drawbar, then the structure is simple and stable, but the spring elements cannot mimic steering movements and loading becomes uneven, reducing damping effectiveness
Solution Approach 1:
The patent applies the dynamics principle by making the plate rotatable relative to the drawbar, allowing the spring elements to dynamically adjust their orientation during steering movements. This rotational capability enables the spring elements to maintain even loading distribution while mimicking the drawbar's angular movements, thereby improving damping effectiveness without requiring complex active control systems.
Solution Approach 2:
The patent segments the coupling device into distinct functional components: the drawbar, the rotatable plate, and the spring elements. This segmentation allows each component to perform its specific function independently - the drawbar provides structural support, the plate enables rotational movement, and the spring elements provide damping - while maintaining overall system simplicity through modular design.
2Adaptability or versatility
If the coupling head is fixed, then the structure is simple, but the coupling cannot accommodate steering movements and deflection in horizontal and vertical planes
Solution Approach 1:
The rotatable plate provides dynamic adaptability by enabling the coupling head to perform steering movements in the horizontal plane. This single rotational degree of freedom allows the coupling to accommodate varying angular positions between connected vehicles while maintaining a relatively simple structural design compared to multi-axial joint mechanisms.
Solution Approach 2:
The patent incorporates deflection capability in both horizontal and vertical planes by designing the through hole to widen outwardly on both sides. This geometric feature allows the drawbar to deflect vertically while the plate handles horizontal steering movements, effectively adding dimensional flexibility to the coupling system without requiring complex articulated mechanisms for each degree of freedom.
3Reliability
If spring elements are positioned on one side only, then the structure is simple, but only one direction of force can be dampened effectively
Solution Approach 1:
The rotatable plate serves multiple functions: it acts as a mounting surface for spring elements on both sides, provides rotational capability for steering movements, and transmits forces between the drawbar and coupling head. By positioning spring elements on both sides of this multi-functional plate, the system achieves comprehensive force damping in both compressive and tensile directions while maintaining structural efficiency.
4Reliability
If overload protection is added, then safety is improved, but the structure becomes more complex
Solution Approach 1:
The patent implements overload protection by designing the housing to be displaceable relative to the flange, creating a built-in safety mechanism that activates before catastrophic failure. During normal operation, the housing and flange are fixed together, but upon strong impact, the housing can displace to absorb excess energy, preventing damage to critical components while adding minimal structural complexity.
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 solution ensures even loading and optimal damping of compressive and tensile forces during coupling, enhancing the linkage device's ability to absorb forces effectively while allowing for deflection, and providing overload protection through energy absorption mechanisms.
Implementation Method 1
a number of spring elements (2a, 2b) mounted on the drawbar (1), in particular for damping the compressive and tensile forces of the railway vehicle that arise when coupling
Implementation Method 2
spring elements (2a, 2b) mounted on the drawbar (1), in particular for damping the compressive and tensile forces
Implementation Method 3
the drawbar is mounted at least in a horizontal plane in a plate (5) that can be rotated within the housing
Implementation Method 4
enable deflection of the coupling head connected to it, and for the drawbar and the spring elements mounted thereon and this plate to likewise adopt these swiveled positions
Data Source
AI summary
Linkage device for a couplings of railway vehicles, the coupling head of which is connected to a drawbar linked to a steering pivot of the railway vehicle, which drawbar is provided with spring elements sitting on it in order to dampen compressive and tensile force that arise, e.g., when coupling the railway vehicle. The spring elements are fastened to a plate that can be rotated about an axis of rotation of the steering pivot. In this way, they are also deflected when the coupling is deflected so that the compressive and tensile forces acting on the latter also act upon its entire surface evenly, even when the coupling is deflected. The linkage device is also provided with overload protection.