Resin Panel Joint Water Sealing via Dual Adhesive Segmentation
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Solution Overview
Problem
Existing vehicle body structures fail to effectively prevent both external water and condensation water from entering the joint gaps between panels, leading to potential interfacial peeling and reduced adhesive performance when exposed to water, especially when using resin materials.
Innovation Solution
A vehicle body structure with a frame structure portion that includes a first panel and a second panel made of resin, where a second adhesive portion is applied to close off the open end of the gap between the panels and the windowpane, providing higher water resistance than the first adhesive portion, thus preventing water ingress and maintaining structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a curved portion is used to inhibit condensation water penetration, then water resistance is improved to some extent, but gaps are created under vibration conditions allowing water to penetrate
Solution Approach 1:
The sealing function is divided into two segments: the first adhesive portion fills the gap between panels, while the second adhesive portion specifically seals the open end of the gap. This segmentation allows each adhesive to perform its specialized function, with the second adhesive providing robust sealing that prevents water penetration even under vibration conditions.
Solution Approach 2:
The first adhesive portion is applied first to fill the gap between panels, creating a preliminary seal. Then the second adhesive portion is applied to close off the open end of the gap. This preliminary action sequence ensures that both adhesives work together effectively, with the second adhesive reinforcing the sealing at the critical open end where water would otherwise penetrate.
2Ease of manufacture
If resin panels are joined by adhesive, then manufacturing complexity is reduced, but water exposure causes interfacial peeling and adhesive performance degradation
Solution Approach 1:
Different adhesive portions are used at different locations: the first adhesive portion fills the internal gap between panels, while the second adhesive portion with higher water resistance specifically seals the open end exposed to water. This local quality differentiation ensures that the most water-exposed area receives the highest water-resistant protection, preventing interfacial peeling while maintaining ease of manufacture.
Solution Approach 2:
The joint structure uses a composite adhesive system combining two different adhesive materials with complementary properties. The first adhesive provides gap-filling and basic bonding, while the second adhesive with superior water resistance provides external water sealing. This composite approach maintains the simplicity of adhesive joining while dramatically improving reliability under water exposure.
3Reliability
If the second adhesive portion seals the open end of the gap, then water resistance is improved, but the structural rigidity may be compromised
Solution Approach 1:
The second adhesive portion simultaneously performs multiple functions: it seals the open end of the gap to prevent water penetration, reinforces the joint between panels, and maintains structural rigidity. By merging sealing and structural functions into a single component, the design improves water resistance without compromising structural strength.
Solution Approach 2:
The second adhesive portion is designed as a multi-functional element that provides water sealing, structural reinforcement, and gap closure. This universal component addresses multiple concerns (water resistance, structural integrity, and manufacturing simplicity) simultaneously, ensuring that improved water resistance does not come at the cost of structural rigidity.
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
This solution effectively prevents both external and condensation water from entering the joint gaps, enhances the structural rigidity of the vehicle body, reduces the risk of interfacial peeling, and improves the workability and cost-effectiveness of the adhesive application process.
Implementation Method 1
a first adhesive portion that adheres to the first joint portion and the second joint portion
Implementation Method 2
a second adhesive portion...arranged closing off or covering an open end of a gap in a joint between the first panel and the second panel
Data Source
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AI summary
A vehicle body structure includes a frame structure portion (22) configured to define an opening (24); the frame structure portion including a first panel (26) having a first joint portion (26C1), a second panel (28) having a second joint portion (34), and a first adhesive portion (36) that adheres to the first joint portion and the second joint portion; a windowpane (20) that is provided on a vehicle outside of the opening and that covers the opening; and a second adhesive portion (42) that adheres to the first panel, the second panel, and the windowpane, wherein at least one of the first panel and the second panel is made of resin, the second adhesive portion is arranged closing off or covering an open end (40A) of a gap (40) in a joint between the first panel and the second panel, and the first adhesive portion is arranged within the gap.