Wire Harness Shield Structure for Heat-Dissipating Electric Wires
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Solution Overview
Problem
Conventional electromagnetic shield members for wire harnesses in vehicles, particularly those connected to high-voltage devices like inverters, face significant heat dissipation challenges due to large current flowing through electric wires, leading to inefficient heat management.
Innovation Solution
The electromagnetic shield member features a tubular housing with a pressing portion formed by cutting and raising the housing inward, which presses the electric wire, increasing contact area and forming through holes for improved heat dissipation, allowing heat to be effectively dissipated to the outside.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the electric wire is housed in a smooth tubular housing portion, then the electromagnetic shielding is effective, but the heat dissipation is insufficient due to limited contact area between the wire and housing
Solution Approach 1:
The housing portion is designed with a pressing portion that has a different local structure (cut and raised inward) compared to the smooth cylindrical portion. This local quality change creates a pressing effect that increases contact area between the electric wire and housing, specifically at the pressing portion location, thereby improving heat dissipation without compromising the overall electromagnetic shielding effectiveness of the smooth tubular structure.
2Object-affected harmful factors
If the housing portion is sealed to provide complete electromagnetic shielding, then shielding effectiveness is maximized, but heat becomes trapped inside the housing portion
Solution Approach 1:
The housing portion incorporates a pressing portion formed by cutting and raising the material inward, which creates through holes that pass through the housing wall. This creates a porous-like structure with controlled openings that allow heat to escape from the housing interior to the exterior, preventing heat accumulation while maintaining sufficient electromagnetic shielding effectiveness through the metallic structure and strategic placement of openings.
3Temperature
If a separate pressing component is added to increase wire-housing contact, then heat dissipation improves, but device complexity increases
Solution Approach 1:
The pressing portion is integrated directly into the housing portion as a unified structure, formed by cutting and raising a section of the housing material inward. This merging of the pressing function into the existing housing structure eliminates the need for separate pressing components or additional assembly steps, thereby improving heat dissipation through increased contact area while avoiding increases in device complexity.
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 heat dissipation from electric wires by increasing the contact area and preventing heat from being trapped, thereby improving the overall thermal management of the wire harness.
Implementation Method 1
heat from the electric wire is likely to be dissipated to the outside via the housing portion including the pressing portion
Implementation Method 2
the heat from the electric wire is less likely to be trapped inside the housing portion, and is likely to be dissipated to the outside of the housing portion via the through hole
Data Source
AI summary
An embodiment of the present disclosure provides an electromagnetic shield member that can improve heat dissipation from an electric wire, and a wire harness that includes the electromagnetic shield member. An electromagnetic shield member has rectangular tubular housing portions in which electric wires are individually housed. The housing portions are provided with pressing portions that are formed by cutting and raising portions of the housing portions inward, and that press the electric wires.