Motor Vehicle Panel Thermal Deformation Control
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Solution Overview
Problem
Motor vehicle body components, particularly plastic parts, face significant deformation and expansion issues due to temperature variations, leading to mechanical performance loss and visible defects, which are exacerbated by the limitations of available plastic materials and result in increased weight and cost when attempting to mitigate these issues through oversizing.
Innovation Solution
A motor vehicle body component comprising a first panel with a higher coefficient of linear thermal expansion and a second panel with a lower coefficient, connected by a third material with an even lower coefficient, specifically a connecting piece made of steel, aluminum, or composite materials, fixed at multiple points to absorb and manage thermal expansion forces effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If plastic body components are used to reduce weight and cost, then weight and manufacturing cost decrease, but thermal deformation and expansion increase under temperature variations
Solution Approach 1:
The patent applies composite material construction by combining plastic panels with reinforcing elements made of materials having different thermal expansion coefficients. The inner panel uses a plastic material while the outer panel or reinforcing elements use materials with lower thermal expansion coefficients, creating a composite structure that maintains light weight while resisting thermal deformation through the synergistic properties of different materials
Solution Approach 2:
The patent changes the physical parameters of the component by selecting materials with specific thermal expansion coefficients and designing the structure to exploit these parameter differences. The reinforcing elements are dimensioned and positioned to counteract the thermal expansion of the plastic panels, transforming the thermal expansion parameter from a source of deformation into a controlled design variable
2Manufacturing precision
If material thickness and reinforcements are increased to reduce thermal deformation, then resistance to thermal deformation improves, but weight and manufacturing cost increase
Solution Approach 1:
The patent applies local quality by providing reinforcements and thicker sections only in specific areas where thermal deformation is most critical, such as around hinge attachments, latch mechanisms, and panel edges. The bulk of the panel structure maintains the lighter plastic construction, achieving improved thermal deformation resistance locally without the penalty of overall weight increase
Solution Approach 2:
The patent uses composite construction with plastic panels combined with reinforcing elements made of materials having lower thermal expansion coefficients. These reinforcements are strategically placed to counteract thermal deformation in critical areas, providing high resistance to thermal deformation where needed while maintaining light weight through the use of plastic in non-critical areas
3Manufacturing precision
If material thickness and reinforcements are increased to reduce thermal deformation, then resistance to thermal deformation improves, but manufacturing cost increases
Solution Approach 1:
The patent segments the body component into separate panels and reinforcing elements that can be manufactured independently using optimized processes for each material and function. The plastic panels are molded separately from the reinforcing elements, allowing each component to be manufactured at its optimal cost point and then assembled, avoiding the need for expensive tooling and processes required for manufacturing thick, integrated reinforced structures
Solution Approach 2:
The patent employs composite construction where plastic panels are combined with reinforcing elements made of materials having lower thermal expansion coefficients. This approach allows each material to be manufactured using its most cost-effective process and then assembled together, achieving superior thermal deformation resistance without the prohibitive cost of manufacturing monolithic thick reinforced structures
4Manufacturing precision
If components are oversized to reduce deformability, then resistance to thermal deformation improves, but weight and manufacturing cost increase
Solution Approach 1:
The patent applies local quality by providing reinforcements and thicker sections only in specific areas where thermal deformation is most critical, such as around hinge attachments, latch mechanisms, and panel edges. The bulk of the panel structure maintains the lighter plastic construction, achieving improved thermal deformation resistance locally without the penalty of overall weight increase
Solution Approach 2:
The patent uses composite construction with plastic panels combined with reinforcing elements made of materials having lower thermal expansion coefficients. These reinforcements are strategically placed to counteract thermal deformation in critical areas, providing high resistance to thermal deformation where needed while maintaining light weight through the use of plastic in non-critical areas
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 configuration enhances resistance to thermal deformations while minimizing material usage and cost, reducing overall deformation and maintaining mechanical performance, thereby improving the appearance and durability of body components like tailgates without the need for excessive reinforcement.
Implementation Method 1
a first panel having a first coefficient of linear thermal expansion and a second panel having a second coefficient of linear thermal expansion greater than the first coefficient of linear thermal expansion
Data Source
Figure 1~3
AI summary
The invention relates to a component (30) of a motor vehicle body, including a first panel (31) and a second panel (32), which has a second coefficient of linear thermal expansion that is higher than the first coefficient of linear thermal expansion of the first panel, and further including a first connecting part (35) that has a third coefficient of linear thermal expansion that is lower than the first, and is connected to the first panel (31).