Automobile Door Glass Run Noise Reduction via Inner Seal Lip
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Solution Overview
Problem
Noise entering an automobile cabin through the door glass remains a significant issue due to reflection amplification in the gap between the inner seal lip and the door glass, which is not effectively addressed by existing sound insulation methods without increasing the weight and cost of the glass run.
Innovation Solution
A glass run with an inner seal lip featuring a sound absorbing portion on its facing surface, set at an angle between 35 and 65 degrees, and optionally a curved surface, to absorb noise and reduce reflection amplification, while maintaining a smooth glass contact surface to prevent wear and noise generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the door glass is made of a pair glass or a film with high sound insulating properties is sandwiched between glasses, then noise penetration is radically reduced, but the weight and cost of the door glass increase significantly
Solution Approach 1:
The invention extracts the sound insulation function from the door glass itself and relocates it to the glass run, specifically to the inner seal lip. By providing a sound absorbing portion on the inner seal lip that contacts the door glass, the noise absorption function is separated from the glass structure, allowing the glass to remain lightweight while still achieving noise reduction
Solution Approach 2:
The inner seal lip with sound absorbing portion acts as an intermediary element between the door glass and the cabin interior. This intermediary structure absorbs noise that has passed through the door glass, preventing it from reaching the passenger's ears directly, thereby achieving noise reduction without modifying the glass itself
2Reliability
If the inner seal lip is made to contact the inner surface of the door glass, then the gap is sealed, but a small space is formed between the base end portion and the door glass where noise can be reflected and amplified
Solution Approach 1:
The invention applies local quality by differentiating the functional properties of different parts of the inner seal lip. The tip end portion maintains contact with the door glass for sealing, while the base end portion is separated to form a gap. The facing surface of the base end portion is equipped with sound absorbing properties to specifically address noise reflection in that localized area
Solution Approach 2:
The invention converts the potentially harmful effect of the gap (which could reflect and amplify noise) into a beneficial structure. By equipping the facing surface of the gap with sound absorbing material, the gap becomes a noise-absorbing cavity rather than a noise-reflection chamber, transforming the harmful resonance effect into a useful noise reduction feature
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 solution effectively reduces sound pressure reaching the passenger's ears by minimizing noise reflection and absorption, improving cabin quietness without significant weight or cost increases.
Implementation Method 1
a facing surface of the inner seal lip facing the inner surface of the door glass is provided with a sound absorbing portion which absorbs noise that has entered the cabin through the door glass
Implementation Method 2
The glass run is attached to the door frame, and includes an inner seal lip (located inside a cabin) which, when attached to the door frame, comes into contact with an inner surface (a surface facing inside a cabin) of the door glass in the upper position. The inner seal lip includes a base end portion integrally molded with a body of the glass run, and a free tip end portion. Thus, when the inner surface of the door glass comes into contact with the inner seal lip, the inner seal lip is elastically deformed to come into close contact with the inner surface of the door glass
Data Source
AI summary
Disclosed is a glass run for an automobile door which may block noise that has passed through a door glass from easily reaching the passenger's ears, while reducing an increase in the weight and cost of the glass run. In the glass run, a space R is formed between a base end portion 41b of an inner seal lip 41 located inside a cabin and an inner surface 22b of a door glass 22 facing inside the cabin. A facing surface 41d of the inner seal lip 41 facing the inner surface 22b of the door glass 22 is provided with a sound absorbing portion 41h which absorbs noise that has entered the inside of the cabin through the door glass 22.