Forked Glass Run Lip Design for Sealing and Assembly
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Solution Overview
Problem
Existing glass runs for automobile doors suffer from variations in positional relations between the door glass and the outer-attaching lip, leading to inadequate noise insulation and water proofing, as well as decreased assembly workability and productivity due to the short length of the outer-attaching lip and its inability to wrap the door glass effectively.
Innovation Solution
A glass run design featuring a forked outer lip with an inner-attaching lip and an outer-attaching lip that extends perpendicularly, where the outer-attaching lip initially does not touch the door glass, allowing it to wrap and apply a stable load as the door glass is guided into the ditch, forming a double sealing structure by thinning the connecting wall's base root and forming a notch for the inner-attaching lip's turning mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the outer-attaching lip is made short to improve assembly simplicity, then assembly workability is improved, but noise insulation and water proofing functions deteriorate due to inadequate wrapping of the door glass
Solution Approach 1:
The outer-attaching lip is designed to dynamically change its position during assembly. Initially, it is positioned away from the door glass to facilitate easy assembly. As the door glass is guided into the ditch, the outer-attaching lip turns following the inner-attaching lip to wrap and contact the door glass, ensuring proper sealing. This dynamic adjustment resolves the contradiction between assembly simplicity and sealing performance.
2Object-affected harmful factors
If the outer-attaching lip is extended to wrap the door glass before guiding into the ditch, then noise insulation and water proofing are improved, but assembly workability deteriorates due to increased complexity and need for partial cutting
Solution Approach 1:
The folding point is preliminarily formed at a specific position on the connecting wall, preparing the structural configuration in advance. This preliminary setup enables the outer-attaching lip to automatically assume its correct wrapping position during the guiding process without requiring pre-adjustment or partial cutting, thus maintaining assembly simplicity while ensuring proper sealing.
3Manufacturing precision
If the inner-attaching lip is made rigid to ensure stable positioning, then positioning accuracy is improved, but adaptability to positional variations deteriorates
Solution Approach 1:
The inner-attaching lip is designed with a folding point that allows it to rotate and adjust its position dynamically. This dynamic capability enables the lip to adapt to various positional relationships between the door glass and the glass run while still providing stable positioning when the glass is correctly installed. The flexibility resolves the contradiction between rigidity for precision and flexibility for adaptability.
Data Source
AI summary
An outer lip 26 is forked into an inner-attaching lip 26X and an outer-attaching lip 26Y, wherein the outer-attaching lip 26Y is set on a position where a top end 26a thereof is not drawn toward a connecting wall 24 side by the door glass 9; a folding point 60 is formed on a connecting wall 24 side of a base root 26d of the inner-attaching lip 26X for turning the inner-attaching lip 26X toward the connecting wall 24 side; thickness 31 of the base root 26d of the inner-attaching lip 26X is thicker than thickness 32 on the folding point 60 and thickness 34 of the base root 26b of the outer-attaching lip 26Y is thinner than thickness 33 of the top end 26a; and the outer-attaching lip 26Y follows turn of the inner-attaching lip 26X and is slidably brought into contact with the door glass 9.