Railway Rail Pad with Dynamic Side Members for Easier Installation
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Solution Overview
Problem
Existing railway rail pads with upstands make it difficult to thread rails between rail clip anchoring devices due to the close fit, complicating the laying process.
Innovation Solution
A railway rail pad design featuring side members with inwardly-facing wall faces that are initially inclined at greater than 90°, increasing the distance between them for easier rail threading, and transitioning to upright configuration under load for close abutment with the rail foot, while providing electrical insulation and cushioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If upstands are provided on the rail pad to provide electrical insulation, then electrical insulation capability is improved, but rail threading difficulty increases due to close fit between upstands and rail foot
Solution Approach 1:
The side members are designed with an obtuse angle configuration that allows them to dynamically adjust their position. During rail threading, the side members naturally splay outward at an obtuse angle to provide a larger gap for the rail foot to pass through. Once the rail is in place and load is applied, the side members transition to an acute angle configuration to provide close abutment and effective electrical insulation. This dynamic geometric transformation resolves the contradiction between ease of threading and insulation effectiveness.
2Reliability
If side members are positioned close to the rail seat portion for effective insulation, then electrical insulation is improved, but rail threading becomes more difficult
Solution Approach 1:
The side members are pre-configured in an obtuse angle position before the rail threading operation. This preliminary configuration creates a larger initial gap between the side members, facilitating easy insertion of the rail foot. After threading is complete and the rail is seated, the side members naturally transition to their acute angle working position, providing close insulation. The preliminary obtuse angle configuration prepares the structure for the threading operation without compromising final insulation performance.
3Ease of operation
If the inclination angle between side members is greater than 90° when not under load, then ease of rail threading is improved, but the compactness under load may be reduced
Solution Approach 1:
The side members are designed with inherent dynamic characteristics that allow their inclination angle to change based on load conditions. When not under load, the side members assume an obtuse angle configuration that provides a larger gap for easy rail threading. When load is applied from the rail foot, the side members naturally transition to an acute angle configuration that provides compact abutment against the rail foot sides. This dynamic shape transformation ensures both easy threading and compact load-bearing configuration.
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
Facilitates easier rail threading and installation by increasing the initial distance between side members for easier alignment and reducing component complexity, while maintaining effective insulation and load-bearing capabilities.
Implementation Method 1
railway rail pad for use beneath a railway rail in a rail fastening assembly as cushioning and/or electrical insulation
Data Source
Figure 1
Figure 2~4
Figure 5~6
AI summary
A railway rail pad (1), for use beneath a railway rail in a rail fastening assembly as cushioning and/or electrical insulation, has first and second major faces (2, 3), the first face (2) having a rail seat portion (20) on which a foot of a railway rail sits when the pad (1) is in use, and side members (4A, 4B) attached to and extending from two opposite edges of the first face (2) of the pad (1). The side members (4A, 4B) are arranged so as to be located on respective opposite sides of the railway rail when the pad (1) is in use such that the rail seat portion (20) of the pad (1) lies between respective inwardly- facing wall faces (41A, 41B) of the said side members (4A, 4B). When the pad (1) is not under load and is placed so as to rest on a surface with the first face (2) of the pad (1) uppermost and part of the surface lying beneath the rail seat portion of the pad, an inclination angle (a-i, 02) between the wall face (41A, 41B) of each side member (4A, 4B) and that part of the surface beneath the rail seat portion on which the pad (1) is resting is greater than 90c. When the pad is not under load, the first face is substantially convex in a vertical plane that is perpendicular to the longitudinal axis of the rail when the pad is in use.