Railway Coupler Damper Arrangement With Elastomeric Force Absorption
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Solution Overview
Problem
Existing railway coupler designs face challenges in efficiently absorbing forces in both buff and draft modes while maintaining a compact size, often leading to malfunctions or breakage due to insufficient stability and space constraints.
Innovation Solution
A damper arrangement comprising a shell, mounting bracket, draw bracket, and a damper with a biased piston, combined with elastomeric elements, allows for efficient force absorption in both modes by dividing the stroke length into two parts, with the damper acting alone initially and then with elastomeric elements, minimizing sudden movements and maximizing total energy absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a damper is rigidly fastened to the vehicle body and wheel carrier, then vibration damping is effective, but stress concentrations and fatigue damage occur at the fastening points
Solution Approach 1:
The rigid fastening connection is segmented into multiple flexible connections by introducing elastomeric elements between the damper and the fastening points. This segmentation distributes the stress and prevents concentration at single points, thereby maintaining damping effectiveness while reducing fatigue damage risk
Solution Approach 2:
Elastomeric elements are introduced as intermediary components between the damper and the fastening points on the vehicle body and wheel carrier. These elastomeric intermediaries provide flexible coupling that reduces stress concentrations while maintaining the damper's vibration damping function
2Ease of manufacture
If conventional rigid fastening methods are used, then installation is simple, but stress concentrations lead to fatigue damage and reduced component life
Solution Approach 1:
The fastening system is segmented into modular components with elastomeric elements that can be pre-assembled and installed as units, maintaining installation simplicity while the elastomeric segmentation prevents stress concentrations that would reduce service life
Solution Approach 2:
The fastening arrangement uses composite construction combining rigid fastening components with flexible elastomeric elements. This composite approach maintains the structural integrity and installation simplicity of rigid fastening while the elastomeric portions prevent fatigue damage, extending component service life
3Device complexity
If the damper is directly mounted without flexible elements, then the structure is simple, but uneven stress distribution causes fatigue at critical points
Solution Approach 1:
The mounting structure applies local quality by introducing elastomeric elements only at the critical fastening points where stress concentrations occur, rather than making the entire structure flexible. This localized approach improves fatigue resistance while maintaining overall structural simplicity
Solution Approach 2:
Elastomeric intermediary elements are placed at specific critical fastening points to locally address stress distribution issues. These intermediaries are positioned only where needed to prevent fatigue damage, maintaining simplicity elsewhere in the mounting structure
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 provides a highly space-efficient and reliable force absorption system that minimizes sudden movements, ensures stable operation, and achieves high energy absorption, particularly in freight transport applications.
Implementation Method 1
a first elastomeric element (1.6) arranged between the first fastening point (1.2, 1.4) and the damper (1.1)
Data Source
Figure 1
Figure 2~3
Figure 4a~4b
AI summary
The present invention relates to a damper arrangement for a railway coupler, comprising - a shell (2) with a mounting bracket - a draw bracket (3), - a damper (4) having a damper body (41) connected to the shell (2) and a piston (42) mounted on a damper head (43), the piston (42) being axially received in the damper body (41) and biased to extend in a forward direction, and - a plurality of elastomeric elements (5) arranged around the 10 damper body (4) between a first disc (53) and a second disc (52), wherein the second disc (52) is slidable to a first axial stop (32) on the draw bracket (3) at a rear part of the damper body (41), and wherein the first disc (53) is slidable to a second axial stop (44) on a forward part of the damper body (41).