Vehicle Glass Run Inner Lip Segmentation for Noise Reduction
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Solution Overview
Problem
Conventional glass runs in vehicles suffer from inadequate sound insulation due to vibrations causing noise, especially in electric and hybrid vehicles where overall quietness increases the demand for improved sound transmission reduction.
Innovation Solution
The glass run design incorporates multiple inner lips with varying lengths and configurations, including a sub-lip and base protrusions, to enhance sound insulation by shifting resonance points to higher frequencies and preventing vibrations, while maintaining smooth sliding contact and sealing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If sound insulation wall is added to block sound transmission, then sound insulation performance is improved, but the wall strikes door glass during vibration causing new noise
Solution Approach 1:
The sound insulation function is divided into multiple inner lips (first inner lip and second inner lip) positioned at different heights, rather than using a single solid wall. This segmentation allows the lips to flex independently during vibration, preventing contact noise while maintaining sound blocking through multiple reflection paths
Solution Approach 2:
The inner lips are designed as flexible, dynamic elements that can deform during door glass vibration. Unlike a rigid sound insulation wall, the lips bend and flex with the vibration, preventing striking noise while still maintaining sound insulation through their continuous contact and reflection paths
2Object-affected harmful factors
If multiple inner lips are added to improve sound insulation, then sound insulation performance is improved, but device complexity increases
Solution Approach 1:
The first inner lip and second inner lip are integrated into a single molded glass run body, combining multiple sound insulation functions into one unified component. This merging approach improves sound insulation without proportionally increasing assembly complexity, as the lips are formed as one piece rather than separate parts
Solution Approach 2:
The inner lips serve multiple functions simultaneously: sound insulation through reflection and absorption, vibration damping through their flexible nature, and sealing through continuous contact with the door glass. This multi-functionality reduces the need for separate components, offsetting the complexity increase
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 design significantly improves sound insulation in the glass run transmission route, reducing radiated noise and water leakage, and maintains effective sealing, as demonstrated by increased insertion loss in specific frequency ranges.
Implementation Method 1
an inner lip (410) coming into sliding contact with the door glass (600)
Implementation Method 2
A sound insulation wall 500 protrudes from at least an end of the vehicle interior side wall 400
Data Source
AI summary
A glass run attached to a groove formed in a door frame includes: a basic frame including a bottom wall, a vehicle exterior side wall, and a vehicle interior side wall; an outer lip provided on the vehicle exterior side wall and coming into sliding contact with the vehicle exterior side of door glass; and an inner lip provided on the vehicle interior side wall and coming into sliding contact with the vehicle interior side of the door glass. The inner lip includes at least a first inner lip, and a second inner lip provided at a position closer to the bottom wall than the first inner lip is. Each of the first inner lip and the second inner lip extends toward the bottom wall, and does not come into contact with each other during sliding contact with the door glass.