Vehicle Side Door Window Assembly for A-Pillar Drag Reduction
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Solution Overview
Problem
Current vehicles experience increased drag due to a 'step' forming between the A-pillar and side window, which disrupts airflow and creates vortical structures.
Innovation Solution
A side door design featuring a first glass flush with the A-pillar surface and a second glass positioned inwardly, creating a step between them, with a seal to prevent water leakage and a trim for smooth airflow transition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a step is formed between the A-pillar and side window, then the side window can be positioned inwardly for structural design, but airflow is disrupted and drag increases
Solution Approach 1:
The window assembly is segmented into a first glass portion and a second glass portion, with the first glass extending to the A-pillar and the second glass positioned inwardly. This segmentation allows the window to maintain an inward position for structural design while the first glass portion eliminates the step that causes drag.
Solution Approach 2:
A trim piece acts as an intermediary element between the first glass and the second glass, providing a smooth transition surface that maintains aerodynamic flow while accommodating the segmented window structure. The trim fills the gap and creates a continuous surface for airflow.
2Loss of energy
If the first glass is arranged flush with the A-pillar surface, then aerodynamic flow is improved, but water leakage paths may be created
Solution Approach 1:
A seal acts as an intermediary between the first glass and the door body, blocking water leakage paths while allowing the first glass to remain flush with the A-pillar surface for aerodynamic benefits. The seal creates a waterproof barrier without compromising the flush arrangement.
Solution Approach 2:
The seal utilizes a flexible membrane structure that can deform to accommodate the interface between the first glass and door body, providing effective water sealing while maintaining the flush arrangement of the first glass with the A-pillar.
3Loss of energy
If a trim is added for smooth airflow transition, then drag is reduced, but device complexity increases
Solution Approach 1:
The trim serves multiple functions simultaneously: it provides a smooth transition surface for aerodynamic flow, accommodates the segmented window structure, and integrates with the door body mounting system. This multi-functionality reduces the need for additional separate components.
Solution Approach 2:
The trim is merged with the door body mounting structure, integrating the aerodynamic function into the existing structural framework rather than adding a completely separate component. This integration reduces overall complexity while maintaining drag reduction benefits.
Data Source
AI summary
A side door for a vehicle and arranged between an A-pillar and a B-pillar of the vehicle includes a door body defining a window opening extending from a front end of the door body to a rear end of the door body. The side door also includes a first glass arranged inside the window opening and is disposed proximately to an associated A-pillar. The side door further includes a second glass movably arranged inside the window opening and extending rearwardly from the first glass. The first glass and the second glass are mounted to the door body such that an outer surface of the first glass is arranged flush with an outer surface of the door body and an outer surface of the second glass is arranged inwardly of the outer surface of the first glass defining a step therebetween.