Vehicle Door Inner Weather Strip End Surface Wall Design
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Solution Overview
Problem
Existing inner weather strips for vehicle doors face issues with dimensional variations and mounting variations, leading to changes in contact angles between the weather strip and the glass run channel, resulting in gaps that allow exterior noise to enter the vehicle interior.
Innovation Solution
A long inner weather strip with a main body part, seal lips, and a top wall lip, featuring an end surface wall that intersects with the longitudinal direction and is integrally joined to the top wall lip, ensuring a stable contact with the glass run channel and door trim, even with dimensional variations, and enhancing the seal pressure to prevent noise entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the inner weather strip is mounted to the beltline with seal lips and top wall lip, then sound insulation is improved by blocking gaps, but dimensional variations and mounting variations cause contact angle changes that result in gaps forming between the weather strip and glass run channel or door trim
Solution Approach 1:
The patent changes the geometric parameters of the weather strip by adding an end surface wall that extends in a direction intersecting with the longitudinal direction. This structural modification creates a stable contact surface that compensates for dimensional and mounting variations, maintaining reliable contact with the glass run channel and door trim despite variations in manufacturing and installation.
Solution Approach 2:
The patent introduces a new dimensional element by adding the end surface wall that extends perpendicular to the main longitudinal axis of the weather strip. This additional dimensional feature (the end surface wall extending in an intersecting direction) provides a stable contact surface that is not affected by longitudinal variations, thereby improving contact reliability.
2Adaptability or versatility
If the top wall lip is made with a thin pleat shape to elastically contact the door trim, then seal flexibility is improved, but shape retaining force is reduced at both longitudinal direction end portions causing the tip end to bend towards root-side
Solution Approach 1:
The patent applies local quality by adding the end surface wall specifically at the longitudinal direction end portions of the weather strip. This localized structural enhancement provides additional shape retaining force exactly where the thin pleat-shaped top wall lip is most vulnerable to bending, without affecting the overall flexibility and elastic contact capability of the seal lips and top wall lip.
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 solution effectively prevents gaps between the inner weather strip and the glass run channel and door trim, improving sound insulation by maintaining a stable contact state and increasing seal pressure, thereby reducing exterior noise entry into the vehicle.
Implementation Method 1
the seal lip is elastically contacted to the window plate to block the gap
Implementation Method 2
the top wall lip is elastically contacted to the door trim to block the gap
Data Source
AI summary
An inner weather strip including: a main body part including at least an exterior lateral wall and a top wall; a seal lip provided on an outer surface of the exterior lateral wall; and a top wall lip provided on an outer surface of the top wall, wherein at least one longitudinal direction end portion of the inner weather strip is provided with an end surface wall, and wherein the end surface wall has a size equal to or larger than a size of an area surrounded by: the seal lip; the main body part; the top wall lip; and a line connecting a tip end of the seal lip and a tip end of the top wall lip, and has a joining part at which the end surface wall and at least a part of an longitudinal direction end surface of the top wall lip are integrally joined.