Vehicle Sealing Junction Geometry for Smaller Roof Gutter Gaps
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Solution Overview
Problem
The existing sealing junction between the roof panel, body panel, and frame gutter in vehicles creates a large gap that poses a risk of waterproof failure, requiring significant manpower for repair.
Innovation Solution
The sealing junction is redesigned to reduce the gap size by adjusting the heights of the roof panel, body panel, and frame gutter, with specific flange lengths and distances from the frame to minimize the gap and enhance sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the roof panel, body panel and frame gutter are connected by welding to form a structural junction, then the structural strength and rigidity are improved, but a large gap is created between the components which increases waterproof failure risk
Solution Approach 1:
A sealant is introduced as an intermediary substance between the roof panel, body panel and frame gutter. The sealant fills the gap created by welding and provides waterproof sealing, thus resolving the contradiction between structural strength (achieved through welding) and waterproof reliability (achieved through sealant application).
Solution Approach 2:
The patent employs a flexible sealant material that can conform to the gap between rigid metal components. This flexible sealing layer accommodates thermal expansion and contraction while maintaining waterproof integrity, addressing the waterproof reliability issue without compromising the rigid welded structure.
2Ease of manufacture
If a large gap exists between the roof panel, body panel and frame gutter, then the manufacturing and assembly process is simplified, but the waterproof failure risk increases significantly
Solution Approach 1:
The patent specifies precise dimensional parameters for the flange lengths (roof panel flange ≥5.5mm, body panel flange ≥6.0mm) and distances from the frame (roof radius to frame <3mm, body panel to frame <2.6mm). By controlling these parameters, the gap size is optimized to balance assembly ease with waterproof reliability, ensuring the gap is large enough for practical assembly but small enough to minimize waterproof failure risk.
3Reliability
If the gap between components is reduced by adjusting heights and flange lengths, then waterproof reliability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent establishes specific parameter ranges (flange lengths and distances) that define the optimal gap dimensions. These parameters are set to achieve waterproof reliability while considering manufacturing capabilities, representing a balanced optimization rather than extreme precision requirements.
Solution Approach 2:
The patent applies different flange length requirements to different components (roof panel flange ≥5.5mm, body panel flange ≥6.0mm) based on their specific positions and functional requirements. This localized quality approach allows each component to contribute appropriately to gap reduction without requiring uniform high precision across all parts.
4Stability of the object's composition
If welding is used to secure the roof panel to the body panel and frame, then the structural stability is improved, but the complexity of the sealing process increases due to the need to seal the large gap
Solution Approach 1:
The sealant serves as an intermediary that simultaneously addresses both structural stability and sealing requirements. It fills the welding gap, providing both waterproof sealing and additional structural bonding, thus reducing the overall sealing process complexity while maintaining structural integrity.
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 reduced gap size effectively lowers the risk of waterproof failure and reduces the manpower required for repairs, while also allowing for better sealing during vehicle manufacturing.
Implementation Method 1
The roof panel is welded with the body panel and the frame gutter
Data Source
AI summary
A vehicle sealing junction has a roof panel, a body panel and a frame. The roof panel has a terminal end directed toward the body panel with an apex on the end extending toward an arcuate portion of the body panel. The body panel includes a gutter flange extending toward the roof panel end. The gutter flange is positioned under the roof panel end. The frame provides a securement surface for the gutter flange.