Automobile Door Sealing Structure Stabilizing Outer Seal Lip
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Solution Overview
Problem
The existing sealing structures for automobile doors with roll and press sashes joined together suffer from degradation in sealing performance and appearance due to the instability of the outer seal lip, which causes water intrusion and an unsightly undulation when the door is closed.
Innovation Solution
A sealing structure that includes a roll sash with an inner-cabin side projection, a press sash without an inner-cabin side projection, a decorative molding, and a weather strip with a rib-shaped protrusion and an upper part protrusion that clasps the decorative molding, stabilizing the outer seal lip and preventing undulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the installation base member is merely arranged on the flat surface of the press sash without a projection, then the structure is simpler, but the outer seal lip becomes unstable and undulates
Solution Approach 1:
The press sash is designed with a localized projection on its inner-cabin side surface, creating a specific structural feature only where needed. This local quality change provides the necessary support for the installation base member without complicating the overall structure, thereby stabilizing the outer seal lip while maintaining simplicity.
2Device complexity
If the installation base member is fixed on the press sash by double-sided tape or clip, then the structure remains simple, but the outer seal lip still undulates and sealing performance degrades
Solution Approach 1:
The fixing mechanism is segmented into two functional parts: the projection on the press sash that provides mechanical support, and the installation base member that interfaces with the weather strip. This segmentation allows each component to perform its specific function effectively, ensuring both structural simplicity and reliable sealing performance.
3Adaptability or versatility
If the outer seal lip is allowed to undulate, then the structure adapts to surface variations, but water intrusion occurs and appearance degrades
Solution Approach 1:
The projection on the press sash preliminarily supports the installation base member in a fixed position, preventing the outer seal lip from undulating before water intrusion can occur. This preliminary anti-action counteracts the potential harmful effect of undulation, ensuring both appearance quality and water sealing without sacrificing adaptability.
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 ensures a stable water cutoff function, prevents water intrusion across the decorative molding, and maintains the appearance by keeping the outer seal lip from undulating, thereby enhancing the sealing performance and aesthetic integrity of the automobile door.
Implementation Method 1
A hollow seal member 32 and an outer seal lip 33 of the door weather strip 30 make elastic contact with a door opening edge of an automobile body 2 when the door 1 is in a closed position
Implementation Method 2
The door weather strip 30 is configured to operably couple to the roll sash 11 by clasping the projection 11c of the roll sash 11 between the rib-shaped protrusion 35 and the outer-cabin side end 31a of the installation base member 31
Data Source
AI summary
A sealing structure for an automobile door includes a roll sash with a projection on an inner-cabin side surface of an upper end periphery thereof, a press sash without a projection and joined to the roll sash, and a decorative molding which covers the sashes. An installation base member of a weather strip is configured to operably couple to an outer circumferential edge on an upper side of the door sash. The weather strip includes a hollow seal member and an outer seal lip. An outer-cabin side end of the installation base member and a rib-shaped protrusion which extends outwardly toward an exterior of an automobile are configured to clasp the projection. An upper part protrusion which extends outwardly toward the exterior of the automobile from an upper side relative to the rib-shaped protrusion is configured to make close contact with an upper part of the decorative molding.