Tongue Rail Switch Roller Arrangement Reducing Torque
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Solution Overview
Problem
Existing devices for moving tongue rails in switches face issues with high maintenance costs, susceptibility to errors due to weather conditions, and wear caused by narrow rail profiles, as well as torque loads and increased width, which affect their service life and operational efficiency.
Innovation Solution
Incorporating smaller intermediate rollers between adjacent rollers with parallel axes of rotation, and designing rollers as elastomer-sprung rollers with a metal hub, allows for smooth movement, reduced torque, and a compact, low-maintenance design that prevents the tongue rail from sinking, while being adaptable to different conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If smaller intermediate rollers are introduced between adjacent rollers, then torque loads on the device are reduced and the design becomes more compact, but the complexity of the roller arrangement increases
Solution Approach 1:
The roller arrangement is segmented into different size categories (larger adjacent rollers and smaller intermediate rollers) rather than using uniform rollers. This segmentation allows the system to reduce torque loads while managing complexity through a systematic pattern of alternating roller sizes.
Solution Approach 2:
Different positions in the roller arrangement have different roller sizes assigned to them. The larger rollers are positioned at specific locations to handle primary load bearing, while smaller intermediate rollers are placed in between to reduce torque and prevent rail sinking, creating local optimization throughout the structure.
2Stability of the object's composition
If the roller size is increased to prevent the tongue rail from sinking, then the structural stability improves, but the friction and wear during rolling increases
Solution Approach 1:
The system uses locally optimized roller sizes where larger rollers provide structural stability and prevent rail sinking at critical positions, while smaller intermediate rollers reduce the contact area and friction during the rolling motion. This local differentiation resolves the contradiction between stability and energy loss.
Solution Approach 2:
The roller system is divided into functional segments: larger rollers for stability and support, and smaller intermediate rollers for low-friction rolling. This segmentation allows each part to optimize for its specific function rather than requiring all rollers to be uniformly large.
3Stability of the object's composition
If multiple rollers are arranged offset to each other to prevent sinking, then the prevention of rail sinking improves, but the overall width of the device increases
Solution Approach 1:
Instead of preventing sinking by increasing width through offset roller arrangement, the invention transitions to a different dimensional approach by using smaller intermediate rollers that fit within the existing width constraints. The anti-sinking function is achieved through roller size selection rather than spatial distribution in the width dimension.
4Ease of operation
If tiltable rollers are used to enable rolling up of the tongue rail, then the ease of operation improves, but the device complexity and maintenance costs increase
Solution Approach 1:
The complex tilting mechanism is extracted and replaced with a simpler system. Instead of using tiltable rollers with mechanical adjustment capabilities, the invention uses fixed rollers with optimized sizes and arrangements that naturally enable the tongue rail to roll up smoothly without requiring active tilting or complex control systems.
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 ensures the longest possible service life with minimal maintenance, reduced wear, and a compact design that is less prone to faults, while maintaining robustness and allowing for easy adjustment and installation.
Implementation Method 1
designing rollers as elastomer-sprung rollers with a metal hub
Implementation Method 2
The movement of the tongue rail must be as low-friction as possible in order to prevent unnecessary wear
Data Source
AI summary
A device for moving a tongue rail of a railway switch, comprising at least two rollers arranged one behind the other and substantially parallel to the course of the rail, on which rollers the tongue rail can roll up from a lower abutting position on the stock rail and directly in front of the first roller onto the first roller, and can roll on to another roller until the tongue rail reaches an open switch remote, wherein at least one additional intermediate roller that is smaller than the rollers, is provided in the space between the rollers, and wherein the axis of rotation of the intermediate roller is arranged substantially parallel to the axes of rotation of the rollers.