Guide Rail Expansion Device Segmentation
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Solution Overview
Problem
Existing expansion devices for roadway guide rails, such as those used in public transport vehicles, fail to effectively manage expansion stresses caused by heat variations and structural expansion joints, particularly in bridges and viaducts, while maintaining the rail's profile and allowing for obstacle ejection.
Innovation Solution
A rail expansion device featuring a continuous portion with alternating clearances in its thickness, arranged in planes parallel to each other, which creates axial discontinuity to accommodate deformation, and includes elastomer filling and riders to limit excessive opening, along with an electrical bypass and elastic ruts for obstacle ejection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If expansion devices are made by junctions in the form of bevels or bayonets, then expansion stresses are managed, but the solution is not applicable to guide rails with facets intended to interact with vehicle systems
Solution Approach 1:
The guide rail is divided into multiple slats that can move independently relative to each other, allowing expansion while maintaining the continuous profile needed for vehicle interaction. Each slat retains the full rail profile with all necessary facets, enabling the segmented structure to both manage expansion and maintain adaptability.
2Adaptability or versatility
If independent slats bonded by elastomer are used, then expansion is accommodated, but the entire profile of the rail is not retained and elastic ruts for obstacle ejection cannot be positioned
Solution Approach 1:
The rail is segmented into slats that maintain the complete profile including elastic ruts, allowing each segment to retain full functionality while collectively accommodating expansion through relative movement.
Solution Approach 2:
The elastomer bonding between slats provides flexible connection that allows relative movement for expansion accommodation while maintaining structural integrity and enabling the retention of the complete rail profile including elastic ruts.
3Reliability
If only elastomer is used to limit play between slats, then simplicity is maintained, but excessive separation of slats cannot be prevented
Solution Approach 1:
The expansion device is segmented into multiple slats with systematic spacing, distributing the expansion accommodation function across multiple elements rather than relying on a single complex mechanism.
Solution Approach 2:
The elastomer elements provide flexible bonding between slats, allowing controlled play for expansion while the systematic arrangement of multiple slats with elastomer spacers prevents excessive separation through distributed constraint.
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 the guide rail to maintain material continuity while accommodating axial deformation, preventing excessive separation and ensuring continuous operation, including electrical conductivity and effective obstacle ejection.
Implementation Method 1
These different slats are able to withstand expansion thanks to a translational guidance provided by through axes which carry these slats... relies solely on the presence of an elastic ruts necessary for the ejection of obstacles
Implementation Method 2
These guide rails may be subjected to expansion stresses, either directly under the action of heat variations on the rail itself
Data Source
Figure 1
Figure 2~3
Figure 4~4b
AI summary
The device has a lubrication system for lubrication of a path portion (2) of a guide rail (1) to facilitate movement in translation of the rail with respect to a ground surface. The path portion of the rail is continuously formed by successive recesses based on thickness of the rail along predefined widths of the recesses, and is alternately arranged at two sides of the rail in planes parallel to each other. Each recess is filled with an elastomer material. An angle iron is positioned on two sides of a base of the rail. The elastomer material is polyurethane resin, foam or silicone.