Capless Closure Device With Segmented Latching And Sealing Edges
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Solution Overview
Problem
Capless closure devices for vehicle refueling ports face issues with wear-induced leakage due to the integration of latching and sealing edges, leading to potential fuel vapor emissions and contamination, with existing solutions either complicating the design or requiring additional components for drainage.
Innovation Solution
A capless closure device design where the latching edge and sealing edge are vertically separated, incorporating an integrated drain passage that is passively closed by the fuel nozzle's rubber sleeve during refueling, ensuring a tight seal and simplified drainage without additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the latching edge and sealing edge are integrated at the same location in a shallow filler neck, then the design is simpler and drainage is easier, but wear on the latching edge degrades the sealing edge causing leakage and fuel vapor emissions
Solution Approach 1:
The filler neck is segmented into distinct functional zones: the latching edge is positioned in the upper portion to engage the fuel nozzle, while the sealing edge is positioned in the lower portion to maintain the seal against the fuel tank opening. This vertical segmentation allows each edge to perform its specific function independently, preventing wear transfer from the latching edge to the sealing edge.
2Reliability
If the filler neck is made deeper to separate the latching edge from the sealing edge, then sealing reliability is improved, but a drain tube must be positioned between the edges adding complexity and parts
Solution Approach 1:
The drainage function is merged with the filler neck structure itself by forming an integrated drain passage within the neck wall. This eliminates the need for a separate drain tube component, while still providing effective drainage between the latching and sealing edges. The drain passage is passively closed by the fuel nozzle's rubber sleeve during refueling, requiring no additional closing mechanisms.
3Ease of operation
If a drain tube is added to drain contaminants between the latching and sealing edges, then drainage capability is improved, but the opening must be closed during refueling adding complexity
Solution Approach 1:
The fuel nozzle's rubber sleeve performs the dual function of sealing against the filler neck's bearing surface and simultaneously closing the drain passage opening. This self-service mechanism eliminates the need for separate closure components or complex control systems, as the refueling operation itself provides the necessary closure action.
Data Source
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AI summary
A capless closure device comprising a body, an end plate provided with a circular opening adapted for receiving a fuel nozzle, and a flap door adapted to close the circular opening, where the capless closure device comprises a latch edge arranged at the lower edge of the circular opening and a spaced apart sealing edge, and where an inlet drain opening is arranged between the latch edge and the sealing edge. The advantage of the invention is that a capless closure device with an integrated drain passage is provided in a cost-effective way.