Inside Door Lining Elastic Fastening for Thermal Expansion
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Solution Overview
Problem
Vehicle interior trim parts, such as inside door linings, often suffer from cracks and deformations due to differing coefficients of linear expansion between materials when exposed to temperature and humidity changes, leading to material failure and loss of visual appeal.
Innovation Solution
Incorporating an elastic fastening region with a material bond between parts, featuring an elastic layer, finger-like extensions, and hollow design to absorb forces and prevent deformation, ensuring the trim part remains visually attractive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a material bond is used to fasten the second part to the first part, then the fastening strength is improved, but the risk of cracks and deformations increases due to different coefficients of linear expansion
Solution Approach 1:
The fastening region is designed with elastic properties by modifying its structural parameters (making it elastically deformable, reducing thickness toward the edge, creating hollow portions) to accommodate thermal expansion differences between materials while maintaining fastening strength
Solution Approach 2:
The fastening region is designed as a flexible, elastically deformable structure that can absorb expansion forces through elastic deformation, preventing cracks and deformations in the first part while maintaining the material bond
2Reliability
If the fastening region is made elastic to prevent deformation, then the resistance to material failure is improved, but the fastening strength may be reduced
Solution Approach 1:
Different regions of the fastening structure have different properties: the root portion provides strong anchoring while the edge portions are made thinner and more elastic to accommodate expansion, creating a gradient of mechanical properties that balances strength and flexibility
Solution Approach 2:
The fastening region combines rigid and elastic properties within the same structure, creating a composite behavior that provides both strong fastening and protection against thermal expansion stresses
3Reliability
If the thickness of the fastening region is reduced toward the edge to increase elasticity, then the resistance to deformation is improved, but the fastening strength at the edge decreases
Solution Approach 1:
The fastening region has varying thickness with the thickest portion at the root for strong anchoring and progressively thinner edges for elastic deformation, creating localized zones with different mechanical properties optimized for their specific functions
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 elastic fastening region effectively prevents material failure and deformation, maintaining the trim part's visual appeal and structural integrity by accommodating linear expansion differences and absorbing forces from various directions.
Implementation Method 1
at least one part having an elastic fastening region... This elasticity has the effect of preventing material failure and/or deformation
Data Source
AI summary
The present invention relates to a vehicle interior trim part with a first part and a second part which is fastened thereto, wherein the first and the second part have different coefficients of length expansion with respect to at least one influencing variable.