Lateral Support Element with Convex Profile for Rail Gas Springs
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Solution Overview
Problem
Existing gas spring assemblies for rail vehicles face challenges in balancing ride quality and handling by achieving a suitable lateral stiffness rate, which is often compromised by either excessive lateral deflection or high stiffness, affecting ease of manufacture, assembly, and cost.
Innovation Solution
A lateral support element with a varying lateral spring-rate profile is introduced, featuring a convex cross-sectional profile and friction-reducing materials at the interface between the flexible wall and the lateral support element, allowing for controlled lateral movement while minimizing friction and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a higher lateral stiffness rate is used in the lateral support element, then vehicle handling and control are improved, but ride quality and comfort deteriorate
Solution Approach 1:
The lateral support element employs a dynamic lateral spring-rate profile that varies with lateral displacement. The convex cross-sectional profile creates a nonlinear stiffness characteristic where the lateral spring rate changes as the flexible wall deflects laterally. This dynamic behavior allows the system to provide higher stiffness for handling during larger displacements while maintaining lower stiffness for comfort during small displacements
Solution Approach 2:
The lateral support element features a convex cross-sectional profile where different portions of the element wall provide different lateral support characteristics. The convex geometry creates localized contact points between the flexible wall and the support element that vary with displacement, enabling different regions to engage at different displacement levels and thus providing position-dependent stiffness
2Object-generated harmful factors
If a lower lateral stiffness rate is used in the lateral support element, then ride quality and comfort are improved, but vehicle handling and control deteriorate
Solution Approach 1:
The system transitions from a static lateral stiffness design to a dynamic one where the lateral spring rate automatically adjusts based on lateral displacement magnitude. During normal riding conditions with small displacements, the lower effective stiffness provides comfort, while during cornering or lane changes with larger displacements, the stiffness increases to provide handling support
3Duration of action of stationary object
If friction-reducing material is added to the interface between the flexible wall and lateral support element, then wear is reduced, but manufacturing complexity increases
Solution Approach 1:
The invention changes the friction parameter at the interface by incorporating friction-reducing material. This material modification reduces the coefficient of friction between the flexible wall and lateral support element, thereby reducing wear during lateral movement cycles while the manufacturing process remains integrated into the existing production workflow
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 enhances ride quality and handling by providing a customizable lateral stiffness profile, reducing friction and wear, and maintaining ease of manufacture and assembly, thus addressing the competing goals of comfort and control.
Implementation Method 1
The interface can include a quantity of friction-reducing material operatively disposed between the flexible wall and the lateral support element
Data Source
AI summary
A lateral support element (304) include an element wall with a first surface facing away from an associated flexible wall (264) and a second surface facing toward the associated flexible wall. The lateral support element is disposed along the associated flexible wall such that an interface (334) is formed between an outer surface of the associated flexible wall and the second surface of the lateral support element. The interface is operative to generate a lateral spring-rate profile in an associated gas spring assembly that varies according to lateral displacement of the associated flexible wall and the lateral support element relative to one another. The interface can include a quantity of friction-reducing material and/or can be at least partially formed by a cross-sectional profile of the lateral support element that includes a convex profile segment. Gas spring assemblies and methods of assembly are also included.