Deck Garnish Stepped Drain Groove Water Intrusion Prevention
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Solution Overview
Problem
Conventional vehicle body structures rely insufficiently on weatherstrips for water intrusion prevention into the engine room, which are prone to degradation when the engine hood is closed, posing a risk to electric components.
Innovation Solution
A vehicle body structure featuring a deck garnish with a stepped portion and a drain groove of bag-shaped cross-section, combined with a concave fitting, waterproof lip, and protrusions to prevent water intrusion, including a convex rib and upward protrusion on the flange portion, ensuring effective water diversion and protection from the engine room.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a weatherstrip is used to seal the space between the deck panel and engine hood, then water intrusion prevention is achieved, but the weatherstrip degrades when pressed by the closed engine hood, reducing waterproof performance
Solution Approach 1:
The water intrusion prevention function is segmented into multiple components: the deck garnish with stepped portion, drain groove, concave fitting, and weatherstrip. This segmentation allows the weatherstrip to focus on sealing while other components handle water drainage and structural support, reducing the burden on the weatherstrip and preventing degradation.
Solution Approach 2:
The concave fitting acts as an intermediary between the deck garnish and weatherstrip. It provides a dedicated mounting structure that positions the weatherstrip optimally, protecting it from direct compression by the engine hood while maintaining sealing effectiveness.
2Reliability
If only a weatherstrip is used for water intrusion prevention, then the structure is simple, but the prevention capability is insufficient and unreliable
Solution Approach 1:
The water intrusion prevention system is divided into functional segments: the stepped portion for water direction, drain groove for water collection and drainage, concave fitting for weatherstrip mounting, and weatherstrip for sealing. Each segment performs a specific function, collectively providing reliable prevention while maintaining reasonable structural complexity.
Solution Approach 2:
The stepped portion introduces a vertical dimension to water flow management, creating a stepped structure that directs water away from the sealing area. This dimensional change enhances prevention capability without significantly increasing horizontal complexity.
3Reliability
If the engine hood is closed to protect the engine room, then the weatherstrip is pressed with predetermined pressure, but this causes degradation and reduces waterproof performance
Solution Approach 1:
The concave fitting serves as an intermediary structure that absorbs and distributes the compression force from the closed engine hood. It protects the weatherstrip from direct high-pressure contact while maintaining the necessary sealing pressure through its geometric design.
Solution Approach 2:
The concave fitting concentrates the sealing function at its lips while distributing the mechanical stress across its broader structure. This local quality differentiation allows the weatherstrip to maintain sealing performance without承受ing excessive compression damage.
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 described structure reliably prevents water intrusion into the engine room by diverting water away from critical components, protecting the weatherstrip from direct water impact and ensuring the integrity of the joint, thereby safeguarding electric components from adverse effects.
Implementation Method 1
the water intruding into the vent hole rolls down to a bottom section of the deck panel and is discharged out of the vehicle
Implementation Method 2
a weatherstrip for hermetically sealing the space with the engine hood is provided at a front end of the deck panel, and the flow can be held back by the weatherstrip
Data Source
AI summary
A vehicle body structure capable of reliably preventing water intrusion into an engine room is provided. For that purpose, there is provided a deck garnish (4), which is disposed so as to occlude a space between an upper surface of a lower part of a windshield (2) and a lower surface of a rear part of an engine hood (3) of a vehicle (1), and which extends in a vehicle width direction. On this front deck garnish (4), formed are: a stepped portion (42) inclined toward a front side of a vehicle body at a lower rear end of the engine hood (3); and drain grooves (43) formed at a front end of the stepped portion (42) so as to have a bag-shaped cross section and configured to communicate with a bottom portion of a deck panel (5).