Railroad Switch Point Roller Mechanism Friction Reduction
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Solution Overview
Problem
Existing railroad switch point mechanisms experience friction and bending issues during movement, requiring additional rollers and adjustment to ensure smooth operation and accurate positioning.
Innovation Solution
A turnable wheel mechanism with a rotatable shaft and eccentric portion for vertical adjustment, supported by a cross-tie and a sheet with a ramp, which reduces friction and allows precise height adjustment of the roller relative to the underlying surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a roller is added beneath the point to reduce friction and prevent bending, then the smooth operation of the point is improved, but the complexity of the mechanism increases
Solution Approach 1:
The mechanism is divided into separate functional components: the point rail, the roller, the bearing plate, and the adjustment mechanism. Each component performs a specific function, allowing the roller to be added independently to reduce friction without redesigning the entire switching mechanism.
Solution Approach 2:
A roller is introduced as an intermediary element between the point rail and the bearing plate. This roller mediates the interaction between the heavy point rail and the support structure, reducing direct friction and preventing bending during switching operations.
2Manufacturing precision
If the height of the roller is adjusted to reduce friction and ensure true switching, then the operation accuracy is improved, but the device complexity increases
Solution Approach 1:
The roller height is made dynamically adjustable through a mechanism involving a rotatable shaft with an eccentric portion. This allows the roller position to be modified during operation to optimize friction reduction and switching accuracy for different operating conditions.
Solution Approach 2:
The vertical position of the roller is changed by rotating the shaft, which moves the eccentric portion and thereby adjusts the roller height relative to the bearing plate. This parameter change enables precise control over the roller's position to minimize friction and ensure proper switching geometry.
3Object-affected harmful factors
If lubricating mechanism is added to the friction surfaces, then the friction is reduced, but the device complexity and maintenance requirements increase
Solution Approach 1:
The patent replaces complex lubricating mechanisms with a mechanical roller solution. Instead of adding lubrication systems to reduce friction, the roller provides a simple mechanical interface that inherently reduces friction through rolling contact, eliminating the need for additional lubricating components.
4Strength
If the point rail is made heavier to ensure stability, then the strength is improved, but the force required to switch the point increases
Solution Approach 1:
The roller acts as a counterweight mechanism that supports the heavy point rail during switching operations. By placing the roller beneath the point, the system distributes the weight and reduces the additional force needed to initiate and maintain the switching motion, despite the heavy point rail 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
The solution reduces friction and electrical load on motors, enabling smooth and accurate movement of switch points, and can be easily installed on existing systems.
Implementation Method 1
The shaft serves as an axle for the wheel and is rotatable relative to the wheel such that the eccentric portion of the shaft moves the axis of the wheel vertically or downwardly relative to the axis of the shaft.
Implementation Method 2
A sheet or plate, overlying the tie, may be provided upon which the wheel rolls during movement of the point.
Data Source
AI summary
A railroad switch point roller mechanism utilized with a rail, a moveable point and a ground supported tie. The mechanism includes a roller or wheel which turns relative to a wheel axis. A wheel support is also employed and holds the wheel relative to the ground supported tie. The support connects to the moveable point, such that the lateral movement of the wheel relative to the ground supported tie takes place when the moveable point travels laterally relative to the rail. An adjustor is also included for finely determining the up or down position of the wheel relative to the tie and the wheel support.