Rail Insulator Segmentation for Preassembly Stability
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Solution Overview
Problem
Existing rail fastening assemblies face challenges in pre-assembling components for concrete ties, as they can become dislodged during transport, and require manual placement of insulators, complicating the assembly process and increasing installation time and costs.
Innovation Solution
A rail clip and insulator design that allows for preassembly of rail seat components on the tie, featuring bifurcated toe sections and shoulder insulators that secure the rail clip in place during transport, enabling easy assembly by pushing the clip onto the rail base once the rail is positioned, with insulators providing insulation and resistance to rail creep.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a one-piece insulator is used in conventional rail fastening assemblies, then insulation between the rail and support shoulder is provided, but the insulator can become dislodged during transport and requires manual placement during installation
Solution Approach 1:
The single insulator is divided into two separate insulators: a shoulder insulator that remains fixed to the support shoulder during transport, and a rail insulator that is pushed onto the rail with the rail clip during installation. This segmentation allows the shoulder insulator to provide reliable insulation during transport while the rail insulator is easily installed alongside the rail clip, resolving the contradiction between insulator retention and ease of assembly.
2Stability of the object's composition
If rail clips and insulators are pre-assembled on the tie, then components can be held in place during transport, but manual placement of insulators is still required before clip installation
Solution Approach 1:
The shoulder insulator is pre-installed on the support shoulder at the tie plant during manufacturing, ensuring it is securely positioned before transport. This preliminary action eliminates the need for manual insulator placement during field installation, as the rail insulator is simply pushed onto the rail together with the rail clip, significantly reducing installation time while maintaining component stability during transport.
3Ease of manufacture
If the rail seat is pre-assembled with all components at the tie plant, then site assembly is simplified, but components may become dislodged during transport
Solution Approach 1:
The rail seat assembly is segmented into transport-stable components: the shoulder insulator is permanently attached to the support shoulder, the rail pad is positioned between the shoulders, and the rail clip with rail insulator is ready to be pushed onto the rail at the site. This segmentation allows maximum pre-assembly at the tie plant while ensuring components remain secure during transport, as each component is independently retained or positioned.
Solution Approach 2:
The shoulder insulator acts as an intermediary component that is permanently fixed to the support shoulder, providing a stable reference point and insulation barrier during transport. This intermediary element ensures that other components like the rail pad and rail clip maintain their positions relative to the shoulder, preventing dislodgement during transport while allowing easy site assembly.
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 and faster assembly of rail seats with reduced component loss during transport and installation, enhancing the stability and durability of the rail fastening system by providing improved resistance to rail creep and simplifying maintenance processes.
Implementation Method 1
an elastic rail clip that seats in the support shoulder and bears down on the rail base
Implementation Method 2
an insulator that lies between the rail and the rail clip and the support shoulder to provide insulation between the shoulder and the rail
Data Source
AI summary
A rail support assembly includes a rail tie, a rail with a rail base, a pair of support shoulders embedded in the rail tie and located on either side of the rail base, rail clips seated in the support shoulders and having a toe section lying on the rail base, rail insulators having an upper portion lying between the clip toes and the rail base, abutting the rail base, and a lower portion wedged between the rail base and the support shoulders, wherein each support shoulder includes: a rail face; a clip gateway through the rail face; a rail clip ramp from the rear of the shoulder to the clip gateway; and a retention ledge formed on the rail face on each side of the clip gateway. When assembled, each retention ledge is disposed above one of the rail insulators to prevent vertical movement of the respective rail insulators.