Flexible Aerodynamic Element for Rail Vehicle Coupling Drag Reduction
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Solution Overview
Problem
Existing passenger transport vehicles, particularly those with alternative drives, face significant aerodynamic losses due to the open surface area around the middle buffer coupling, leading to increased energy consumption and reduced range.
Innovation Solution
A simplified clutch arrangement featuring a flexible aerodynamic element that is movable relative to the middle buffer coupling and connection contour, providing aerodynamic closure without the need for complete sealing during all clutch movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a highly flexible seal made of textile-like material is used to achieve complete sealing around the coupling, then aerodynamic sealing effectiveness is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The invention extracts the aerodynamic sealing function from the mechanical coupling system by introducing a separate flexible aerodynamic element that can be independently optimized. This allows the coupling mechanism to focus on mechanical function while the aerodynamic element handles sealing, reducing overall system complexity
Solution Approach 2:
The flexible aerodynamic element is designed to dynamically adapt to coupling movements through its material properties rather than requiring complex mechanical linkages. The element stretches and compresses with coupling motion, maintaining aerodynamic sealing without adding mechanical complexity
2Loss of energy
If a highly flexible seal made of textile-like material is used to achieve complete sealing around the coupling, then aerodynamic sealing effectiveness is improved, but manufacturing cost increases
Solution Approach 1:
The flexible aerodynamic element is designed as a simpler, more economical component that can be manufactured from cost-effective materials. Rather than using expensive textile-like materials, the invention employs a practical flexible element that achieves sufficient aerodynamic performance at lower cost
3Ease of manufacture
If the flexible aerodynamic element is made simpler and more robust, then ease of manufacture and maintenance are improved, but sealing effectiveness during extreme coupling movements deteriorates
Solution Approach 1:
The invention applies partial sealing action by accepting that complete sealing during extreme coupling movements like reversing is not necessary. The flexible aerodynamic element provides sufficient sealing for normal operation while allowing gaps during extreme movements, reducing manufacturing complexity
Solution Approach 2:
The invention converts the potential harm of gaps during reversing into an acceptable design feature. Rather than attempting to seal during extreme movements, the design allows controlled gaps that do not significantly impact overall aerodynamic performance, simplifying the element design
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 air resistance, lowers costs and weight, and simplifies the clutch arrangement by using easier-to-manufacture materials and designs, while accepting some loss of sealing effectiveness during specific conditions like reversing or cornering.
Implementation Method 1
a flexible aerodynamic element for aerodynamically closing the coupling jaw relative to the central buffer coupling
Data Source
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AI summary
The invention relates to a coupling arrangement 10, in particular of a rail vehicle for passenger transport, comprising a central buffer coupling 100, a coupling jaw 200 surrounding the central buffer coupling 100 with a connection contour 210, and a flexible aerodynamic element 300 for aerodynamically closing the coupling jaw 200 relative to the central buffer coupling 100. The flexible aerodynamic element 300 is movably arranged relative to the central buffer coupling (100) and/or relative to the connection contour (210) of the coupling jaw (200).