Vehicle Body Soundproof Structure for Window Gap Road Noise
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Solution Overview
Problem
Existing vehicle soundproof structures require a large area of sound absorption material to effectively reduce road noise, which increases material costs and is inefficient due to limited space for the material, especially since they do not adequately address noise entering through gaps between the side panel and the wheelhouse.
Innovation Solution
A vehicle body soundproof structure that includes a soundproof member fixed to the upper end of an interior material, which is bent diagonally and in contact with the window panel, filling the gap between the interior material and the window panel, and using a corner portion of the soundproof member to compress against the window panel, reducing noise entry with a smaller volume of material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large area of sound absorption material is used to improve noise insulation performance, then noise reduction effectiveness is improved, but material costs increase and space availability is exceeded
Solution Approach 1:
The sound absorption material is strategically positioned only at the gap between the side panel and the upper edge portion of the interior material, rather than being distributed across a large area. This localized placement targets the specific noise infiltration path, achieving effective noise reduction with minimal material quantity.
Solution Approach 2:
The soundproofing solution is segmented into two functional parts: (1) the sound absorption material that fills the gap between the side panel and interior material, and (2) the soundproof member attached to the interior material that contacts the wheelhouse. This segmentation allows each component to address specific noise paths efficiently.
2Reliability
If sound absorption material is placed in the space between interior material and side panel, then noise insulation is improved, but the available space is limited due to electrical components
Solution Approach 1:
The sound absorption material is placed only at the specific gap region between the side panel and the upper edge portion of the interior material, avoiding areas occupied by electrical components. This localized placement achieves noise insulation without requiring extensive space.
Solution Approach 2:
The soundproof member extends in the vehicle width direction to contact the wheelhouse, creating a three-dimensional soundproofing structure that utilizes the available space more effectively and addresses noise from multiple directions.
3Ease of manufacture
If the soundproof structure does not address the gap between side panel and interior material upper edge, then installation is simpler, but road noise enters the vehicle interior through the gap
Solution Approach 1:
The sound absorption material is configured as a flexible strip that can be inserted into and conform to the gap between the side panel and the upper edge portion of the interior material. This flexible design effectively seals the gap to prevent noise intrusion while maintaining simple installation.
4Reliability
If sound absorption material is attached to the back face of trim member and partially contacts wheelhouse, then noise insulation is improved, but material costs increase due to large area requirement
Solution Approach 1:
The sound absorption material is placed only at the critical gap region between the side panel and interior material upper edge, rather than being attached over a large area to the back face of the trim member. This localized approach reduces material quantity while maintaining noise insulation effectiveness.
Solution Approach 2:
The soundproofing system is divided into two functional segments: the sound absorption material that addresses the gap between side panel and interior material, and the soundproof member that contacts the wheelhouse. This segmentation eliminates the need for large-area material attachment while achieving comprehensive noise insulation.
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
Effectively reduces road noise entering the vehicle interior with a smaller amount of soundproof material, improving quietness while maintaining design aesthetics and preventing water intrusion.
Implementation Method 1
a soundproof member 60 fixed to an upper end portion 52 of the interior material 50. The soundproof member 60 is provided in contact in a compressed state with an inner surface of the window panel 24
Implementation Method 2
The soundproof member 60 is provided in contact in a compressed state with an inner surface of the window panel 24, so as to fill a gap formed between the upper end portion 52 of the interior material 50 and the window panel 24
Data Source
AI summary
The present invention provides a vehicle body soundproof structure Sp that is configured to block noise from outside a vehicle, and comprises a window panel 24 fixed in a window frame 22 located on a side portion of a vehicle body 10, an interior material 50 provided at a vehicle interior side of the window frame 22 and having an upper end portion 52 extending diagonally upward in a direction toward the window panel 24, and a soundproof member 60 fixed to the upper end portion 52 of the interior material 50. The soundproof member 60 is provided in contact in a compressed state with an inner surface of the window panel 24 so as to fill a gap G formed between the upper end portion 52 of the interior material 50 and the window panel 24.