Anti-extraction fairing for inclined roller guidance
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Solution Overview
Problem
Existing guidance systems for road vehicles with inclined rollers on rails face issues with derailment due to external obstacles, as conventional anti-extraction devices with rotating catches are inadequate in resisting dynamic forces and require complex bearings, which are costly and prone to failure.
Innovation Solution
A guidance system with fixed fairing parts that form a non-rotating assembly, providing enhanced resistance to extraction forces by extending under the guide rail flanks and offering additional protection and object evacuation capabilities, using simpler ball bearings and adaptable shapes for improved functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rotating catches (lugs) are used as anti-extraction devices, then the guide assembly is protected against extraction forces, but the device complexity increases due to the need for complex biconical bearings to withstand tearing forces passing through the bearings
Solution Approach 1:
The invention extracts the anti-extraction function from the rotating lug system and relocates it to a fixed fairing part. The fairing part's extension engages under the guide rail flank to provide anti-extraction protection, while the rotating lugs are eliminated, thereby removing the need for complex biconical bearings and allowing the use of simpler ball bearings.
Solution Approach 2:
Instead of having the anti-extraction element (lug) rotate with the roller, the invention inverts the approach by using a fixed non-rotating fairing part that remains stationary while the roller rotates. This fixed fairing part provides continuous anti-extraction protection without the dynamic loads that would require complex bearings.
2Reliability
If rotating catches (lugs) are used as anti-extraction devices, then the guide assembly is protected against extraction, but the cost increases due to the requirement for complex and expensive biconical bearings
Solution Approach 1:
The invention extracts the anti-extraction function from the rotating lug system and relocates it to a fixed fairing part. The fairing part's extension engages under the guide rail flank to provide anti-extraction protection, while the rotating lugs are eliminated, thereby removing the need for complex biconical bearings and allowing the use of simpler ball bearings.
Solution Approach 2:
The invention replaces expensive complex biconical bearings with cheaper simple ball bearings by relocating the anti-extraction function to the fixed fairing part. This substitution significantly reduces manufacturing costs while maintaining or improving anti-extraction reliability.
3Reliability
If rotating catches (lugs) are used as anti-extraction devices, then the guide assembly is protected against static extraction forces, but the resistance to dynamic tearing forces is reduced due to the rotation of lugs encountering objects in lateral grooves
Solution Approach 1:
Instead of having the anti-extraction element (lug) rotate with the roller, the invention inverts the approach by using a fixed non-rotating fairing part that remains stationary while the roller rotates. This fixed fairing part provides continuous anti-extraction protection without the dynamic loads that would require complex bearings.
Solution Approach 2:
The fairing part's extension is positioned in advance under the guide rail flank to engage with it before any extraction force occurs. This preliminary positioning ensures that both static and dynamic tearing forces are resisted from the outset, preventing the guide assembly from being lifted or extracted.
4Reliability
If conventional rotating lugs are used, then the anti-extraction function is provided, but the rollers are exposed to projections and object ejection during rolling
Solution Approach 1:
The fairing part acts as a protective shell or envelope around the roller. This shell covers the roller's outer face and provides a protective barrier that shields the roller from debris, projections, and object ejection during rolling, while the extension of the fairing part simultaneously provides the anti-extraction function.
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 anti-extraction safety device significantly increases the force required for guide assembly extraction, ensuring better resistance to dynamic forces and allowing for simpler, cost-effective design with enhanced protection and maintenance features.
Implementation Method 1
the extensions of the fairing parts not rotating, the resistance to tearing is the same in dynamic as in static
Implementation Method 2
a guidance assembly for a road vehicle guided by two inclined rollers rolling on a rail
Implementation Method 3
the guide rollers are conventionally forced against the guide rail by an elastic return force of approximation, for example by means of a spring arm
Data Source
AI summary
The invention relates to an anti-extraction safety device comprising, for each roller (13, 14), a rotatably fixed, preferably enveloping, shroud part (32, 33) forming a single-component functional mechanical set with its counterpart. Said shroud parts are inclined and the base thereof has an extension (46, 47) which extends beneath the projecting flanks (21, 22) of the head of the guiding rail (19) in order to prevent any extraction of the guidance set. At the front, the base of the shroud parts is preferably moulded into a spout for collecting and disposing of objects which may be present on the guiding track. The invention can be used for the rail guidance of road vehicles used for public transport.