Vehicle Window Structure With Segmented Damping Adhesive

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Solution Overview

Problem

Existing window structures in vehicles face challenges in effectively reducing windshield vibrations, which can lead to noise and discomfort for passengers, and current vibration-reduction adhesives may not adequately secure support rigidity or be cost-effective.

Innovation Solution

A window structure for vehicles that incorporates a vibration-reduction adhesive with a storage modulus of 10-17MPa, applied to the peripheral edge portion of the window frame member, and a partitioning section that divides the adhesive in a longitudinal direction, enhancing its deformation resistance and strain energy sharing ratio.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If vibration-reduction adhesive is applied to adhere the windshield to the frame body, then the vibration-reduction effects are improved, but the support rigidity of the windshield deteriorates

Engineering Contradiction:

Improvewindshield vibrationVSAvoidsupport rigidity

Core Design Contradiction:

Object-affected harmful factorsVSStrength

Solution Approach 1:

The adhesive application area is divided into multiple regions by providing adhesive portions at specific locations (corner portions and intermediate portions) rather than continuous application. This segmentation allows the adhesive to reduce vibrations at key points while maintaining rigidity in other areas through the frame structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the adhesive application are optimized for different functions: corner portions provide strong bonding and vibration reduction, while intermediate portions provide additional vibration damping. The frame body's rigid sections maintain structural support while the adhesive layers at specific locations absorb vibrations.

Inventive Principle:

Principle #3Local quality

2Strength

If the storage modulus of the adhesive is increased to improve support rigidity, then the support rigidity is improved, but the vibration-reduction performance deteriorates

Engineering Contradiction:

Improvesupport rigidityVSAvoidwindshield vibration

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The storage modulus of the adhesive is specifically controlled within the range of 10-17 MPa, which is an optimized parameter range that balances both vibration-reduction performance and support rigidity. This parameter optimization ensures the adhesive is compliant enough to damp vibrations while maintaining sufficient rigidity for structural support.

Inventive Principle:

Principle #35Parameter changes

3Strength

If adhesive is applied to all peripheral edge portions, then the support rigidity is improved, but the cost increases due to increased adhesive consumption

Engineering Contradiction:

Improvesupport rigidityVSAvoidadhesive application amount

Core Design Contradiction:

StrengthVSQuantity of substance

Solution Approach 1:

Instead of continuous adhesive application along the entire peripheral edge, the adhesive is applied in segmented portions at strategically located corner and intermediate positions. This segmentation reduces the total adhesive quantity required while maintaining effective vibration reduction and support rigidity through proper placement at critical locations.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Adhesive is applied only at necessary locations (corner portions and selected intermediate portions) rather than the entire peripheral edge. This partial action approach provides sufficient vibration reduction and structural support at the critical adhesive locations without the cost and material consumption of complete peripheral coverage.

Inventive Principle:

Principle #16Partial or excessive action

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 solution improves the vibration-reduction effects without increasing the adhesive application amount, secures the support rigidity of the windshield, and offers cost-effective benefits by optimizing the use of vibration-reduction adhesive.

Implementation Method 1

a vibration-reduction adhesive having a storage modulus of 10 - 17MPa and applied to at least part of the peripheral edge portion of the window frame member

Methodology Applied

Scientific EffectViscoelasticity: Viscoelasticity

Implementation Method 2

a partitioning section to partition at least part of the vibration-reduction adhesive in a longitudinal direction which corresponds to an application direction of the vibration-reduction adhesive

Methodology Applied

Scientific EffectDeformation resistance: Deformation

Data Source

PatentEP4570541A1Window structure of a vehicle

Publication Date: 2025.06.18 MAZDA MOTOR CORP

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Figure 4~5

AI summary

A window structure comprises a window member (3) covering an opening portion (2a) of a window frame member (2) and piled on a peripheral edge portion (2b) of the window frame member (2), a vibration-reduction adhesive (5) having a storage modulus of 10 MPa - 17 MPa and applied to at least part of the peripheral edge portion (2b) along the peripheral edge portion (2b) so as to adhere the window member (3) to the peripheral edge portion (2b), and a partitioning section (10) to partition at least part of the vibration-reduction adhesive (5) in a longitudinal direction, which corresponds to an application direction of the vibration-reduction adhesive.