Railway Switch Sleeper Elastic Layer Segmentation
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Solution Overview
Problem
Existing track switch systems face challenges in smoothing rail deflections and preventing sleeper tilting, particularly at points where branch tracks intersect with main tracks, due to inadequate elastic properties distribution.
Innovation Solution
The implementation of at least two vertically spaced elastic planes, comprising elastomer layers in sleeper soles and intermediate layers, with adjustable stiffness and hardness to optimize elastic properties and counteract tilting effects, ensuring homogeneous load transfer and resistance to lateral displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single elastic layer is used in the overall structure, then the structure is simpler, but the ability to smooth rail deflections and prevent sleeper tilting is insufficient
Solution Approach 1:
The elastic support system is segmented into two distinct elastic layers: a first elastic layer between the rail and sleeper, and a second elastic layer between the sleeper and trackbed. This segmentation allows each layer to be independently optimized for specific functions, improving overall reliability in smoothing rail deflections and preventing sleeper tilting while maintaining reasonable structural complexity.
Solution Approach 2:
The invention adds a vertical dimension to the elastic support system by introducing a second elastic layer at a different vertical level (between sleeper and trackbed) in addition to the first elastic layer (between rail and sleeper). This dimensional expansion enables coordinated optimization of elastic properties at multiple levels, enhancing the system's ability to counteract tilting and smooth deflections.
2Reliability
If elastic properties are uniform throughout the turnout, then manufacturing is easier, but the ability to counteract tilting at specific points is reduced
Solution Approach 1:
The invention applies local quality by allowing the first and second elastic layers to have different elastic properties (stiffness, hardness, bedding modulus) at different locations within the turnout. This enables targeted optimization at specific points to counteract tilting, with each elastic layer's properties tailored to the local requirements while maintaining ease of manufacture through modular design.
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
This configuration allows for precise adaptation of elastic properties to specific locations within the switch, effectively reducing sleeper tilting and improving load transfer homogeneity, thereby enhancing the overall performance and durability of the track system.
Implementation Method 1
The elastomer layer of the sleeper base of each sleeper is provided to have at least two differently soft areas... wherein the elastomeric layer of the intermediate layer arranged between the first of the rails and the upper surface of this sleeper and the elastomeric layer of the intermediate layer arranged between the second of the rails and the upper surface of this sleeper are of different hardness relative to each other
Data Source
Figure 1~3
Figure 4~8
AI summary
Switch (1) for a track system for railway vehicles, wherein the switch (1) comprises rails (2) and a sequence of sleepers (4) and at least two of the rails (2) are attached in pairs opposite each other on a sleeper top surface (5) of the respective sleeper (4) and an intermediate layer (6) is arranged between each of the rails (2) and the respective sleeper top surface (5) and the sleepers (4) each have a sleeper base (8) on their respective sleeper top surfaces (5) opposite each other and the sleeper bases (8) each have at least one elastomer layer (9) wherein the intermediate layers (6) each have at least one elastomer layer (10).