Vehicle Glass Run Sub-lips Prevent Seal Separation
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Solution Overview
Problem
Existing glass runs for vehicle doors experience abnormal noise due to separation of seal lips from the door glass, especially when vibrating on rough roads, and this issue is not adequately addressed by existing solutions, which also face challenges with seal lip deterioration and varying vehicle sizes and shapes.
Innovation Solution
The glass run design includes an exterior sub-lip projecting obliquely from the exterior side wall and an interior sub-lip projecting towards the base of the interior seal lip, both with thick portions to enhance sealing and prevent separation, along with thick portions on the exterior and interior seal lips to maintain contact and reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the door glass is positioned slightly below a fully closed position, then the door glass can be easily installed and removed, but the door glass is likely to be displaced in an interior direction and separate from the seal lips, causing abnormal noise
Solution Approach 1:
The glass run is divided into multiple functional segments: the basic frame structure, the exterior seal lip, the interior seal lip, and the critical sub-lips (exterior and interior). This segmentation allows each component to perform its specific function - the sub-lips prevent displacement while the main seal lips provide sealing, resolving the contradiction between ease of operation and contact stability.
Solution Approach 2:
The sub-lips act as intermediary elements between the door glass and the main seal lips. When the door glass is in the slightly below closed position, the sub-lips make contact first to prevent interior displacement, while the main seal lips remain ready to provide sealing when the glass is properly positioned. This intermediary structure enables both easy operation and reliable contact.
2Reliability
If the seal lips are made more elastic to maintain contact with the door glass, then abnormal noise is reduced, but the seal lips deteriorate faster and lose elastic force
Solution Approach 1:
The sealing system is segmented into sub-lips and main seal lips with different functional requirements. The sub-lips, which prevent displacement, can be designed with different material properties than the main seal lips, which provide sealing. This allows optimization of each segment's durability for its specific function, extending overall service life while maintaining contact stability.
Solution Approach 2:
The patent changes the structural parameters of the seal lips by adding sub-lips with different geometric configurations (projecting obliquely from the side walls). This structural parameter change allows the seal system to maintain contact stability through geometry rather than relying solely on elastic force, reducing deterioration from repeated deformation and extending service life.
3Ease of manufacture
If the glass run structure is simplified to reduce cost and weight, then manufacturing is easier, but the ability to prevent separation and noise is insufficient
Solution Approach 1:
The glass run integrates multiple functions into a single molded structure: the basic frame, exterior seal lip, interior seal lip, exterior sub-lip, and interior sub-lip are combined into one piece. This merging approach prevents separation and noise while maintaining manufacturing simplicity through single-mold production, resolving the contradiction between ease of manufacture and reliability.
Solution Approach 2:
The glass run structure is designed as a multi-functional component that simultaneously provides: structural support (basic frame), sealing (exterior and interior seal lips), and displacement prevention (sub-lips). This universal design achieves reliable separation prevention without requiring multiple separate parts, maintaining ease of manufacture while improving reliability.
Data Source
AI summary
A glass run includes at least one of: an exterior sub-lip formed so as to project obliquely from an interior side of the exterior side wall that is closer to the bottom wall than a base portion of the exterior seal lip; an interior sub-lip formed so as to project obliquely in a direction toward a base portion of the interior seal lip from an exterior side of the interior side wall that is closer to the bottom wall than the base portion of the interior seal lip, the interior sub-lip formed with a thick portion on a base portion on a side of the interior seal lip; a thick portion formed on a base portion of the exterior seal lip; or a thick portion formed on a side of the interior seal lip that is not in contact with the door glass.