Rail Coupling Shaft Torsion Limiting With Rolling Contact
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Solution Overview
Problem
Existing coupling assemblies for rail vehicles experience torsional stresses due to pivotable connections, which need to be effectively limited to prevent wear and ensure reliable operation.
Innovation Solution
A coupling arrangement with torsion limiting elements, such as spherical caps, symmetrically arranged on the coupling shaft to limit torsional movements, allowing rolling interaction between the coupling shaft and rear coupling part, thus avoiding wear and utilizing existing space without additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a pivot pin is positioned in a through-hole in a coupling shaft to create a pivotable connection, then the coupling shaft can pivot relative to the rear coupling part, but torsional stresses are introduced into the hinge assembly that must be limited
Solution Approach 1:
The coupling shaft is segmented by adding discrete torsion limiting elements (such as lateral protrusions or ribs) that divide the shaft's cross-section into distinct functional zones. These segments allow controlled torsional deformation while maintaining overall structural integrity, resolving the contradiction between enabling pivotable operation and limiting torsional stress.
Solution Approach 2:
The coupling shaft employs a composite structural design combining the main shaft body with integrated torsion limiting elements. This composite structure allows the shaft to exhibit different mechanical properties in different directions - free pivoting motion in the vertical plane while restricting torsional rotation, thereby achieving both ease of operation and reliability.
2Reliability
If additional connecting elements or devices are provided on the coupling shaft to limit torsional movement, then torsional stress is controlled, but the available installation space is reduced and device complexity increases
Solution Approach 1:
The torsion limiting elements are merged with the coupling shaft to form an integrated, unitary structure. Rather than adding separate components, the limiting elements are formed as integral parts of the shaft itself (through casting, forging, or machining), which reduces device complexity while maintaining effective torsional control.
Solution Approach 2:
The coupling shaft is designed with multi-functionality, serving both as the primary coupling component and as the mounting structure for torsion limiting elements. This universal design allows the shaft to perform multiple functions - transmitting force, enabling pivoting, and limiting torsion - without requiring additional dedicated components, thereby reducing overall device 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 effectively limits torsional movements, reducing wear and ensuring reliable operation by integrating torsion limiting elements on the coupling shaft, providing a low-wear interaction and full utilization of installation space.
Implementation Method 1
These individual torsion limiting elements are preferably designed as spherical caps, i.e., with a three-dimensionally curved surface. This offers the advantage of low-wear interaction between the coupling shaft and the rear coupling part in the event of large deflections, due to the resulting rolling motion between them.
Data Source
Figure 1a~1d
AI summary
The invention relates to a coupling arrangement for a rail vehicle, comprising a first coupling part, comprising a coupling shaft or coupling rod having a through-opening in a first end region, a rear coupling part with a mounting structure for installation on a rail vehicle, a joint arrangement comprising a spherical bearing and a vertically extending pivot pin for articulated connection of the coupling shaft to the rear coupling part, and a device for limiting torsional or roll movements in the area of the connection between the coupling shaft and the rear coupling part. The invention is characterized in that the device for limiting torsional or roll movements is arranged on the coupling shaft.