Vehicle Door Lower Space Noise Insulation Design
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Solution Overview
Problem
Existing vehicle side portion structures face challenges in reducing noise entering the cabin through the door lower space without making it difficult to close the door, as sealing members either increase reaction force or compromise noise insulation.
Innovation Solution
A vehicle side portion structure is designed with a specific geometry that includes an aperture lower edge portion, a sealing member, and a vehicle body-side wall surface with defined surfaces and spaces, creating a mechanism that absorbs and reflects noise using the principle of an expansion silencer, while allowing a narrow door lower space width to maintain easy door closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a sealing member is provided at the lower end portion of the door to seal the door lower space, then noise insulation performance is improved, but reaction force increases making door closure more difficult
Solution Approach 1:
The door lower space is divided into multiple regions: a first space adjacent to the outer side of the sealing member, a corner upper space at the vehicle upper side, and a second space at the vehicle lower side. This segmentation allows the sealing member to be positioned optimally within the divided space, reducing its direct contact area with the door during closure while maintaining effective noise sealing through the coordinated action of multiple spaces.
Solution Approach 2:
The patent introduces a vertical dimension by creating a corner upper space above the sealing member and a second space below it. This multi-level spatial arrangement allows noise to be blocked through multiple horizontal planes (outer side, upper side, lower side), effectively reducing noise insulation requirements for any single sealing point while easing door closure.
2Ease of operation
If the sealing member is removed to ease door closure, then ease of operation is improved, but noise insulation performance deteriorates
Solution Approach 1:
The door lower space structure serves multiple functions simultaneously: the first space and sealing member provide noise sealing, the corner upper space provides additional sealing path and structural support, and the second space provides drainage functionality. This multi-functional design allows effective noise insulation without requiring a large or overly aggressive sealing member that would hinder door closure.
Solution Approach 2:
The corner upper space acts as an intermediary structure between the sealing member and the vehicle body. It provides a transition zone that allows the sealing member to effectively seal the door lower space without creating excessive reaction force, while also maintaining the structural integrity needed for noise insulation.
3Ease of operation
If the door lower space width is reduced to improve door closure ease, then ease of operation is improved, but noise insulation effectiveness is reduced
Solution Approach 1:
The patent applies different spatial configurations to different regions of the door lower space: the first space is positioned at the outer side where noise entry is most critical, the corner upper space is positioned at the upper side for structural support and additional sealing, and the second space is positioned at the lower side for drainage. This localized optimization allows effective noise insulation in critical areas while maintaining overall compactness for easy door closure.
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
This design effectively reduces noise entering the vehicle cabin by utilizing the principle of an expansion silencer, improving noise insulation without increasing the difficulty of closing the door, and also enhances drainage and water management.
Implementation Method 1
a first space, which is adjacent to a vehicle outer side of the sealing member, and is a space between the sealing member and the corner upper space... a mechanism that reflects noise both in front of and behind the first space is provided, noise from outer side the vehicle entering the vehicle cabin interior can be reduced by employing the same principle as that used in an expansion silencer
Data Source
AI summary
In a vehicle side portion structure, a vehicle body-side wall surface, which is a wall surface at a side of an aperture lower edge portion of a door lower space, is formed so as to include a first upper surface, a first corner surface, and a first vertical surface that extends substantially downwards from the first corner surface. The door lower space is formed so as to include a corner upper space, which is a space located at a vehicle upper side of the first corner surface, and a first space, which is a space between a door weather strip and the corner upper space. A width in a vehicle up-down direction of the corner upper space is less than a width in the vehicle transverse direction of the first space, and is also less than a width in the vehicle up-down direction of the first space.