Variable Gauge Rail Chassis Axle Coupling Mechanism
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Solution Overview
Problem
Conventional rail vehicles with fixed track widths are unsuitable for precise positioning on rails, especially in applications requiring maintenance or measurement at high speeds, as they lead to unwanted lateral play and potential derailment at switches and crossings, particularly in tight curve radii and narrow installations.
Innovation Solution
A chassis with at least two axles and four rail wheels, featuring a spreading device that adjusts track width using hydraulic rams or a rack and pinion drive, coupled via a mechanism that ensures the narrowest axle sets the track width for all axles, preventing excessive spreading and maintaining precise alignment without guide swords.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the track width is fixed to match the rail spacing, then the rail vehicle can swim in the track with lateral play to compensate for rail spacing changes, but this causes unwanted lateral play and potential derailment at switches and crossings
Solution Approach 1:
The patent applies the dynamics principle by making the track width variable instead of fixed. The spreading device actively adjusts the distance between rail wheels on the same axle, allowing the track width to dynamically adapt to different track conditions. This enables precise positioning on straight sections while preventing excessive spreading at switches and crossings, thereby resolving the contradiction between reliability and positioning precision.
2Measurement precision
If the rail wheels are spread apart to eliminate lateral play, then precise positioning on rails is achieved, but this causes potential derailment at switches and crossings due to excessive spreading
Solution Approach 1:
The patent implements feedback control through the coupling mechanism that monitors and coordinates the spreading of multiple axles. When one axle detects the need for spreading, the coupling mechanism ensures other axles spread in a coordinated manner, preventing excessive spreading that could cause derailment. The system continuously adjusts the track width based on feedback from the rail wheel-rail contact, maintaining precision while ensuring safety.
3Reliability
If guide swords are used to prevent excessive spreading at switches, then derailment is prevented, but the device complexity increases and guide swords may collide with rails in tight curve radii
Solution Approach 1:
The patent applies the extraction principle by removing the guide swords from the system entirely. Instead of adding external guiding components that may collide with rails in tight curves, the invention uses the coupling mechanism between axles to inherently limit and coordinate spreading. This eliminates the need for separate guide sword components, reducing device complexity while maintaining reliability through the integrated axle coupling system.
4Measurement precision
If the track width is made variable with spreading device, then precise positioning is achieved, but the device complexity increases
Solution Approach 1:
The patent applies the merging principle by integrating the spreading function into the existing axle and wheel suspension system. The coupling mechanism combines the spreading devices of multiple axles into a coordinated system, where the axles work together as a unified structure. This merging approach reduces overall device complexity compared to independent spreading mechanisms on each axle, while maintaining precise positioning capability through the coordinated action of the coupled axles.
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 solution allows safe and precise guidance of rail vehicles through switches and crossings, preventing derailment and enabling effective maintenance and measurement processes even in tight spaces, without the need for guide swords, thus enhancing operational safety and efficiency.
Implementation Method 1
spreading device which spreads the rail wheels of the respective axles in the direction of an increased track width
Implementation Method 2
spreading device which spreads the rail wheels of the respective axles in the direction of an increased track width
Implementation Method 3
at least two of the axles with variable track widths are coupled via a coupling mechanism in such a way that the axle with the smallest track width also specifies this track width for the other axle(s)
Data Source
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AI summary
The invention provides a chassis for a rail vehicle with at least four track wheels (1a, 1b) arranged on at least two axles (2, 3), each with a variable track gauge, and with a spreading device that spreads the track wheels (1a, 1b) of the respective axles (2, 3) towards a wider track gauge. The chassis features a modified and improved guidance system for the variable track gauge of the axles compared to the prior art, in that it eliminates the need for the guide blades known and used in the prior art and thus functions reliably even in areas with closely spaced track and tight curve radii. For this purpose, at least two axles (2, 3) of the chassis, each with a variable track gauge, are coupled via a coupling mechanism (8a, 8b) such that the axle (2, 3) with the narrowest track gauge also determines this track gauge for the other axle(s) (2, 3).