Railway Front Flap Assembly with Offset Joint for Symmetrical Opening
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Solution Overview
Problem
Existing front hatch systems for rail vehicles face challenges in providing a simple, robust, and cost-effective solution that ensures symmetrical opening width and adequate coverage of protruding elements like the guide horn, while maintaining aerodynamic and aesthetic advantages, often requiring complex mechanisms or design compromises.
Innovation Solution
A front hatch arrangement featuring two pivotable flaps with a step along the outer edge of one flap to overlap with the other, creating a symmetrical opening width and offset joint, allowing for symmetrical deflection and improved aerodynamics without increasing space or weight, using simple kinematics and geometric optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If simple rotary mechanisms are used for front flaps, then the mechanism is robust and simple, but the front flap cannot open far enough to allow all coupling deflections
Solution Approach 1:
The front flap is divided into two separate flaps (first flap and second flap) that can move independently. Each flap is equipped with its own actuating mechanism, allowing them to open to different extents. This segmentation enables the flaps to provide sufficient coverage for coupling deflections while maintaining simple rotary mechanisms for each individual flap.
2Adaptability or versatility
If the vehicle front is designed to be wider to accommodate larger opening angles, then coupling deflection is allowed, but aerodynamic properties and appearance are compromised
Solution Approach 1:
Instead of designing a statically wider vehicle front, the invention uses dynamically adjustable flaps that can change their position and opening angle as needed. The flaps are equipped with actuating mechanisms that allow them to open to specific angles to accommodate coupling deflections while maintaining a streamlined vehicle front geometry when closed, thus preserving aerodynamic properties and appearance.
3Shape
If one flap is equipped with a step to cover the joint, then aerodynamics are improved, but the opening width becomes asymmetrical causing collision risk
Solution Approach 1:
The step structure is applied locally only to the first flap rather than symmetrically to both flaps. This local modification allows the first flap to cover the joint area for improved aerodynamics while the second flap maintains its full opening width. The independent actuation of each flap compensates for the asymmetry, ensuring that the combined opening width remains sufficient and symmetrical in function, eliminating collision risk.
4Adaptability or versatility
If telescoping coupling is used to cover the guide horn, then coverage is achieved, but weight, component price and life cycle costs increase significantly
Solution Approach 1:
The front flap system is segmented into two independently actuated flaps, each capable of opening to specific angles. This segmentation allows the flaps to collectively provide full coverage of the guide horn and coupling elements when closed, while maintaining a simpler and lighter construction compared to telescoping couplings. The independent actuation ensures that the flaps can open sufficiently to allow coupling deflections without requiring complex telescoping mechanisms.
Data Source
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AI summary
The assembly (200) has first and second flaps (210,220) that are combined together in first position in which it is opened, and are separated in second position in which it is closed. The outer edge portion of first flap is overlapped with outer edge portion of second flap in region of vertical axis (230) parallel to center surface (260) of assembly so that joint (250) is offset from center surface. The flaps are designed so that the outer edges of the first and second flaps in the first position with respect to the center surface are provided with symmetrical opening width. Independent claims are included for the following: (1) rail vehicle; and (2) method for opening and closing front flap assembly.