Vehicular Resin Panel Rib Design for Thermal Warping
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Solution Overview
Problem
Vehicular resin panel structures with differing linear expansion coefficients experience significant deformation when heated, leading to potential interference with the vehicle body due to uneven expansion and restraint at fixing points.
Innovation Solution
The implementation of a resin vehicular panel structure with a polygonal inner panel and a ribbed design, where the first rib is positioned outside the imaginary line connecting fixing points, intersecting it, and additional ribs are placed parallel to the imaginary line between fixing points to enhance rigidity and suppress warping deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If multiple resin panels with differing linear expansion coefficients are adhered together to reduce weight, then weight reduction is achieved, but heat deformation occurs when heat is applied
Solution Approach 1:
The patent applies local quality by providing ribs at specific locations on the inner panel - particularly at portions further from fixing points and at angular portions. These localized structural reinforcements have different rigidity characteristics than the base panel, allowing the panel to maintain overall lightness while having specific high-rigidity zones that resist heat-induced deformation.
Solution Approach 2:
The patent uses composite material principles by combining resin panels with differing linear expansion coefficients (outer panel with higher coefficient, inner panel with lower coefficient) and integrating rib structures. This composite approach creates a multi-layer system where each material's thermal expansion characteristics are compensated by the structural design, reducing overall deformation.
2Stability of the object's composition
If the panel structure is fixed to the vehicle body at multiple points, then structural stability is improved, but warping deformation occurs at portions further from the fixing points
Solution Approach 1:
The patent addresses this contradiction by providing ribs at specific locations - particularly at angular portions and areas further from fixing points. These localized reinforcements create high-rigidity zones that prevent warping deformation in the most vulnerable areas, while maintaining flexibility and lightness in other regions of the panel.
Solution Approach 2:
The rib structure segments the panel into distinct rigid zones. The ribs divide the large panel area into smaller, more rigid sections that can better accommodate thermal expansion differences without undergoing excessive warping deformation between fixing points.
3Adaptability or versatility
If the outer panel with higher linear expansion coefficient expands more than the inner panel when heated, then thermal expansion is natural, but the inner panel undergoes warping deformation toward the vehicle inner side
Solution Approach 1:
The patent applies local quality by placing ribs specifically at angular portions and areas further from the imaginary line connecting fixing points. These localized reinforcements prevent the inner panel from warping toward the vehicle inner side by providing structural support exactly where the differential thermal expansion causes the most stress and deformation.
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 design effectively reduces warping deformation of the inner panel, preventing interference with the vehicle body by distributing deformation stress and maintaining panel integrity during temperature changes.
Implementation Method 1
the outer panel with a higher linear expansion coefficient expands a large amount, and the other panel with a lower linear expansion coefficient deforms under this influence
Implementation Method 2
the first rib is provided further to the in-plane direction outer side of the resin inner panel than the imaginary line connecting the first fixing point and the second fixing point, running along a direction intersecting the imaginary line. Thus, the rigidity of the angular portion is increased
Data Source
AI summary
A vehicular resin panel structure is provided including a resin inner panel formed in a polygonal shape including a first edge portion, a second edge portion, and an angular portion, and fixed to a vehicle body at plural fixing points including a first fixing point and a second fixing point. The resin inner panel is further provided with a first rib further to an in-plane direction outer side of the resin inner panel than an imaginary line connecting the first fixing point and the second fixing point, and running along a direction intersecting the imaginary line. The first rib runs along a direction intersecting the imaginary line. The vehicular resin panel structure includes a resin outer panel including an outer end portion overlapping with the inner panel adhered to an inner end portion of the inner panel, and having a larger linear expansion coefficient than that of the inner panel.