Expandable Support for Vehicle Panel Stiffness
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Solution Overview
Problem
Vehicle panels are prone to deformation due to heat expansion and stress, and existing reinforcement methods using stiff adhesives or mastic materials often result in gaps, uneven coatings, and permanent deformations.
Innovation Solution
An expandable support structure with a body portion made of a material that expands to fill the gap between the panel and the reinforcement, providing increased stiffness while minimizing deformation and coating issues, using a material with a Young's modulus less than 300 MPa and an expansion ratio of 400% to 2000%, which can be easily applied without specialized tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If stiff structural reinforcing material is used to bond braces directly to panels, then structural support is improved, but gaps may be created between the brace and panel due to adhesive bead thickness variations
Solution Approach 1:
The patent changes the physical state and mechanical properties of the bonding material by using expandable foam instead of stiff structural reinforcing material. The foam expands after application to fill gaps and accommodate thickness variations, transforming from a rigid bonding approach to a flexible filling approach that adapts to manufacturing tolerances.
Solution Approach 2:
The patent employs a composite bonding system combining adhesive and expandable foam materials. The adhesive provides initial bonding while the expandable foam fills gaps and accommodates thermal expansion differences, creating a multi-material solution that addresses both structural support and gap prevention requirements.
2Strength
If thick adhesive bead is applied to ensure adequate bonding, then structural support is improved, but excess adhesive may prevent proper coating of the vehicle body
Solution Approach 1:
The patent applies a controlled amount of adhesive preliminary, then allows the expandable foam to expand and fill remaining gaps. This staged approach ensures adequate bonding without requiring excessive adhesive application, as the foam completes the gap-filling function after the adhesive is already in place.
Solution Approach 2:
The expandable foam acts as an intermediary material between the adhesive and the final bonded structure. It absorbs the excess volume that would otherwise be problematic, expanding to fill gaps without creating the coating issues associated with thick adhesive beads.
3Strength
If rigid structural foams or reinforcing materials are used to bond braces to panels, then structural support is improved, but local plastic deformations may occur due to different thermal expansion rates
Solution Approach 1:
The patent changes the mechanical properties of the bonding material from rigid to flexible by using expandable foam with lower Young's modulus. This parameter change allows the bonding material to accommodate thermal expansion differences between panel and brace materials, preventing stress concentration and plastic deformation while maintaining bonding strength.
Solution Approach 2:
The expandable foam creates a flexible bonding layer between the rigid panel and brace components. This flexible intermediate layer absorbs thermal expansion mismatches, preventing the transmission of stress that would cause permanent deformations while still providing adequate structural support.
4Manufacturing precision
If mastic materials are used to bond braces to panels, then gap filling is improved, but the material is difficult to apply and may require specialized machinery
Solution Approach 1:
The expandable foam performs self-service by automatically expanding to fill gaps after application. This eliminates the need for specialized machinery required for mastic materials, as the foam's expansion property provides the gap-filling function automatically, simplifying the application process while maintaining precise gap filling.
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 expandable support structure enhances panel stiffness, prevents deformation, and ensures proper coating by filling the gap between the panel and reinforcement, reducing the risk of thermal expansion-related issues and excess adhesive problems.
Implementation Method 1
The expandable support may be formed of a material configured to expand to an expanded material
Data Source
Figure 1
Figure 2~3A
Figure 3B~4B
AI summary
Exemplary reinforced structures, e.g., panel structures, and methods of making the same are disclosed. A reinforced structure may include a panel support extending along a panel. The panel support may be relatively rigid in comparison to the panel. The structure may further include an expandable support having a body portion mounted on the panel support. The body portion may be formed of an expandable material such that the body portion is configured to engage the panel upon expansion, thereby providing an expanded support acting between the panel and the panel support after expansion.