Motor Vehicle Glass Run Noise Reduction Design
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Solution Overview
Problem
The existing glass run structures for motor vehicle doors experience rattling and contact noise due to the weak repulsive force of foamed sponges, which fail to maintain contact at high frequencies, and increasing their size can lead to increased sliding resistance, especially in low temperatures.
Innovation Solution
An elastically deformable portion is introduced inside the cabin, with a soft portion interposed between this deformable portion and the interior lip, allowing for reduced rattling and noise while maintaining low sliding resistance by absorbing the vibrations and noise effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the size of the highly foamed sponge is increased to press it strongly against the interior lip, then the contact noise is reduced, but the sliding resistance of the windowpane increases
Solution Approach 1:
The sealing structure is divided into two distinct components: a highly foamed sponge for absorbing vibrations and reducing contact noise, and a separate soft portion made of a softer material for reducing sliding resistance. This segmentation allows each component to perform its specific function without interfering with the other, resolving the contradiction between noise reduction and ease of operation.
Solution Approach 2:
Different regions of the sealing structure are assigned different material properties: the highly foamed sponge provides strong repulsive force for vibration absorption, while the soft portion provides low friction for smooth sliding. This local differentiation of material qualities allows the system to simultaneously achieve noise reduction and ease of operation.
2Reliability
If the highly foamed sponge is made larger to maintain contact at high frequencies, then the rattle is reduced, but the sliding resistance increases
Solution Approach 1:
The sealing structure is divided into two distinct components: a highly foamed sponge for absorbing vibrations and reducing contact noise, and a separate soft portion made of a softer material for reducing sliding resistance. This segmentation allows each component to perform its specific function without interfering with the other, resolving the contradiction between noise reduction and ease of operation.
Solution Approach 2:
Different regions of the sealing structure are assigned different material properties: the highly foamed sponge provides strong repulsive force for vibration absorption, while the soft portion provides low friction for smooth sliding. This local differentiation of material qualities allows the system to simultaneously achieve noise reduction and ease of operation.
3Force
If the highly foamed sponge is pressed strongly against the interior lip, then the repulsive force is increased, but the windowpane cannot be moved smoothly in low temperatures
Solution Approach 1:
The sealing structure is divided into two distinct components: a highly foamed sponge for absorbing vibrations and reducing contact noise, and a separate soft portion made of a softer material for reducing sliding resistance. This segmentation allows each component to perform its specific function without interfering with the other, resolving the contradiction between noise reduction and ease of operation.
Solution Approach 2:
Different regions of the sealing structure are assigned different material properties: the highly foamed sponge provides strong repulsive force for vibration absorption, while the soft portion provides low friction for smooth sliding. This local differentiation of material qualities allows the system to simultaneously achieve noise reduction and ease of operation.
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 configuration effectively reduces rattling and contact noise even at high frequencies without increasing the sliding resistance of the windowpane, ensuring a quiet cabin environment and smooth operation.
Implementation Method 1
a soft portion is interposed between the elastically deformable portion and the interior lip... allowing for reduced rattling and noise while maintaining low sliding resistance by absorbing the vibrations and noise effectively
Implementation Method 2
an elastically deformable portion protruding from the interior sidewall of the glass run body, and arranged to face an inner surface of the interior lip that faces the inside of the cabin so as to be elastically deformable toward or away from the cabin
Data Source
AI summary
Disclosed herein is a glass run having the ability to reduce a rattle while keeping the sliding resistance of a glass windowpane low enough. The glass run includes an exterior lip, an interior lip, and an auxiliary interior lip. A windowpane is inserted between the exterior and interior lips. A soft portion, made of a softer material than the interior lip or auxiliary interior lip, is interposed in a region where the interior lip and the auxiliary interior lip overlap with each other. The soft portion may be provided for at least one of the interior lip and auxiliary interior lip.