Door Weather Strip Outer Lip Stabilization
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Solution Overview
Problem
Current door weather strips face issues with sealing performance and appearance due to excessive rigidity, which leads to water and wind entry, noise, and aesthetic degradation, particularly when the door track intersects the vehicle body at large angles, causing the outer lip to fall inward and the rear lip to stray from the door edge.
Innovation Solution
A door weather strip design featuring a hollow seal member with a linear outer-cabin side wall and a vertically extending outer lip, where the thickness of the outer-cabin side wall is greater than the outer lip, and the inner-cabin side surface of the hollow seal member is closer to the interior, stabilizing the outer lip and enhancing sealing by preventing it from falling inward, while the rear lip maintains contact with the door edge to prevent water entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the outer lip is made with high rigidity to maintain sealing contact, then sealing force is improved, but the outer lip falls inward causing reverse and malfunction
Solution Approach 1:
The outer lip is divided into multiple sections along its length, with each section having independently adjustable rigidity. The first section (near the seal member) has higher rigidity to maintain sealing contact, while the second section (outer portion) has lower rigidity to prevent inward falling and reverse, allowing the lip to flex appropriately under door movement forces.
Solution Approach 2:
Different portions of the outer lip are assigned different rigidity characteristics to perform different functions. The inner portion near the hollow seal member maintains high rigidity for effective sealing contact with the door edge, while the outer portion has reduced rigidity to accommodate door movement without falling inward or causing reverse.
2Quantity of substance
If the outer-cabin side wall is made thinner to reduce material, then manufacturing cost is reduced, but the hollow seal member loses stability and sealing performance deteriorates
Solution Approach 1:
The hollow seal member's outer-cabin side wall features localized thickness variation: the wall is thicker at critical sealing positions to maintain stability and sealing performance, while being thinner in non-critical areas to reduce overall material usage and cost.
3Adaptability or versatility
If the door track intersects the body surface at large angles (≥45 degrees), then door installation flexibility is improved, but the outer lip falls inward causing reverse and malfunction
Solution Approach 1:
The outer lip is designed with dynamic flexibility through its segmented structure with varying rigidity. This allows the lip to adapt its shape and position dynamically in response to different door track angles and movement forces, maintaining effective sealing contact whether the door track intersects the body at small or large angles.
Solution Approach 2:
The segmented outer lip structure allows different sections to undergo different deformation parameters under varying door track angles. The lower rigidity outer portion flexes more to accommodate large intersection angles, while the higher rigidity inner portion maintains sufficient contact pressure for sealing across all angle configurations.
4Stress or pressure
If the hollow seal member outer-cabin side wall falls inward, then material stress is reduced, but unnecessary space appears allowing water and wind entry
Solution Approach 1:
The hollow seal member's outer-cabin side wall incorporates localized reinforcement at the lower end portion where water and wind entry is most likely. This creates a thicker, more rigid section that resists falling inward under stress while maintaining overall material efficiency, preventing gaps that would allow harmful elements to penetrate.
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 configuration improves sealing performance by stabilizing the outer lip and rear lip, preventing water and wind entry, and enhancing the appearance by maintaining effective contact with the door and vehicle body, thus addressing issues of water entry and noise caused by large spaces.
Implementation Method 1
a hollow seal member (32) which is integrally molded with an inner-cabin side and an outer-cabin side of the installation base member (31) and which makes elastic contact with a door opening edge of a body (10) when the door (1) is in a closed position
Implementation Method 2
the outer lip (33) making elastic contact with a surface of the body (10) in a direction substantially perpendicular when the door (1) is closed
Data Source
AI summary
An outer lip is continuous with an outer-cabin side wall which has a linear shape of a hollow seal member. The outer lip makes elastic contact with a surface of a body in a direction substantially perpendicular when a door is closed. A rear lip extends from a position close to a base root of the outer lip toward an outer-cabin side and makes elastic contact with a peripheral edge of the door. A thickness of the outer-cabin side wall of the hollow seal member is not less than a thickness of a vertical part of the outer lip; and an inner-cabin side surface of the outer-cabin side wall of the hollow seal member is closer to an inside of the automobile than an inner-cabin side surface of the vertical part of the outer lip.