Resin Vehicle Floor Grounding Structure
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Solution Overview
Problem
The use of resin materials in vehicle bodies leads to inadequate electromagnetic wave absorption, resulting in increased interference with external antennas and environments due to poor grounding performance, especially when conductive materials are embedded directly, which can be damaged by vehicle impacts.
Innovation Solution
A vehicular grounding structure featuring a sheet-shaped conductive wiring sheet and a sheet-shaped conductive portion electrically connected to a grounding potential, where the conductive portion overlaps the wiring sheet on the vehicle's outer surface, effectively absorbing electromagnetic waves from electric power and signal lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the body is resinified to reduce vehicle weight, then weight reduction is achieved, but grounding performance declines and electromagnetic wave absorption becomes insufficient
Solution Approach 1:
The patent uses a composite structure combining resin material for the floor portion with a conductive material layer for grounding. This allows the vehicle body to benefit from the weight reduction of resin while maintaining the electromagnetic wave absorption and grounding performance of conductive materials.
Solution Approach 2:
The grounding structure is segmented into distinct functional layers: a resin floor portion and a separate conductive material layer. This segmentation allows each material to perform its optimal function - resin for structural support and weight reduction, conductive material for electromagnetic wave absorption.
2Reliability
If conductive material is directly embedded in the resin body, then grounding function is provided, but the conductive material may be damaged by vehicle impacts
Solution Approach 1:
The conductive material is applied as a flexible layer on the resin floor portion rather than being rigidly embedded. This thin film approach allows the conductive layer to flex and absorb impact forces without breaking, maintaining grounding function while improving impact resistance.
Solution Approach 2:
The resin floor portion acts as an intermediary between the vehicle body structure and the conductive material layer. It provides mechanical support and protection to the conductive layer, absorbing impact forces and preventing direct damage to the grounding material.
3Object-affected harmful factors
If the conductive portion overlaps the wiring sheet on the outer portion side, then electromagnetic wave absorption is improved, but the structure becomes more complex
Solution Approach 1:
The grounding structure merges the floor portion and conductive material layer into a single integrated assembly. The conductive layer is applied directly to the resin floor, combining structural support and electromagnetic wave absorption functions in one component rather than separate assemblies.
Solution Approach 2:
The overlapping configuration of the conductive portion automatically provides electromagnetic wave absorption for the wiring sheet without requiring additional shielding components. The grounding structure serves multiple functions - structural support, grounding, and electromagnetic interference protection - through its own configuration.
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 suppresses the influence of electromagnetic waves on external antennas and environments, improves durability by reducing the need for extensive grounding, and facilitates weight reduction while maintaining effective electromagnetic compatibility.
Implementation Method 1
a sheet-shaped conductive portion electrically connected to a grounding potential, wherein the conductive portion includes a part disposed to overlap a surface of the wiring sheet on an outer portion side of the vehicle
Data Source
AI summary
A grounding structure for a vehicle provided with a floor portion formed of a resin material includes a sheet-shaped wiring sheet including a conductive material for electrical connection between an electric power supply and an electronic component and a sheet-shaped conductive portion electrically connected to a grounding potential. The conductive portion includes a part disposed to overlap a surface of the wiring sheet on an outer portion side of the vehicle.