Resin Division Bar Fastening for Vehicle Door Sealing
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Solution Overview
Problem
Existing vehicle door structures experience sealing issues due to contact friction between sealing components and division bars, leading to wind noise and potential gaps between the window frame and division bar, which compromises the sealing performance.
Innovation Solution
A vehicle door structure featuring a division bar made of resin with an embedded insert nut and softer sealing components, molded using two-color molding, which allows for secure fastening without bending deformation, enhancing sealing performance by aligning linear components and utilizing common materials for cost reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal division bar is used with a bracket for fastening, then the fastening strength is improved, but the bracket may open due to contact friction with sealing components, causing bending deformation and gaps
Solution Approach 1:
The invention changes the material parameter of the division bar from metal to resin, and changes the fastening mechanism from a bracket with bent portion to a direct fastening using an insert nut embedded in the division bar. This eliminates the bending deformation issue while maintaining fastening strength through the insert nut's engagement with the resin material.
Solution Approach 2:
The invention uses a composite structure combining resin material for the division bar with an insert nut (typically metal) embedded within it. This composite approach allows the resin to provide flexibility and integration with sealing components, while the insert nut provides the necessary fastening strength and resistance to pulling forces.
2Reliability
If sealing components are attached to the division bar, then sealing performance is improved, but contact friction prevents pulling up of the division bar during fastening
Solution Approach 1:
The invention changes the material parameter of the division bar from metal to resin, which fundamentally alters the fastening mechanism. The resin material allows for embedding an insert nut that can withstand axial forces without requiring a bracket structure, thereby eliminating the issue of contact friction preventing pulling up during fastening.
3Ease of manufacture
If a bracket with bent portion is used for fastening, then the division bar can be fastened to the window frame, but the bent portion may open causing gaps and wind noise
Solution Approach 1:
The invention changes the material parameter of the division bar from metal to resin and eliminates the bent portion structure entirely. The direct fastening method using an insert nut embedded in the resin division bar provides a more reliable connection that prevents gaps and wind noise, while still being manufacturable through molding processes.
Solution Approach 2:
The invention extracts and removes the bent portion from the fastening structure, replacing it with a simpler direct fastening method using an insert nut. This eliminates the source of the problem (the bent portion that could open) while maintaining the fastening function.
4Adaptability or versatility
If multiple separate components are used for division bar and sealing components, then assembly flexibility is improved, but the number of parts increases and manufacturing cost rises
Solution Approach 1:
The invention merges the sealing components with the division bar by molding them as an integrated unit. The resin division bar is molded with the insert nut already embedded, and sealing components are integrated into the structure, reducing the number of separate parts while maintaining assembly flexibility through the modular nature of the integrated unit.
Data Source
AI summary
The division bar is provided between a fixed window and a vertically slidable window. The division bar is made of resin. A fastening surface opposed to the fastening surface of the main frame is formed at the upper end of the division bar. Further, an insert nut is embedded in an upper end of the division bar so that an axial end surface is exposed at a fastening surface of the division bar. A sealing component made of a resin softer than the division bar is provided around the upper end of the division bar.