Shielded High-Voltage Wire Harness for In-Cabin Magnetic Field Control
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Solution Overview
Problem
When a high-voltage wire harness is disposed inside a vehicle compartment, there is a concern that a magnetic field generated by a large electric current may impact passengers without appropriate measures.
Innovation Solution
A wire harness configuration that includes an electric wire, a metallic shield, a resin case, and a metallic cover, where the resin case has a holding portion for the metallic member, which suppresses the impact of the magnetic field and prevents dislodgement of the electric wire.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the wire harness is disposed inside the vehicle compartment, then the magnetic field impact on passengers is suppressed by the body, but the complexity of shielding structure increases
Solution Approach 1:
The patent combines the resin case and resin cover into a single integrated housing structure that encloses the electric wire and metallic shield. This merging of components reduces the overall number of parts and simplifies the shielding structure while maintaining the magnetic field suppression function through the metallic shield and grounding mechanism.
Solution Approach 2:
The housing structure serves multiple functions: it provides mechanical protection for the electric wire, contains the metallic shield, and establishes grounding connections through the resin case's contact with the vehicle body. This multi-functionality reduces the need for separate shielding components, thereby simplifying the overall structure.
2Reliability
If a separate resin cover is used to cover the opening of the resin case, then the electric wire member is protected, but the device size and complexity increase
Solution Approach 1:
The resin case and resin cover are merged into a single integrated housing structure with a closed cavity. This eliminates the need for separate fastening mechanisms and reduces the number of components while maintaining the protective function for the electric wire member housed within the cavity.
3Reliability
If the metallic member is fixed to the vehicle body, then the shielding effect is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The resin case acts as an intermediary that provides grounding for the metallic shield. Instead of directly fixing the metallic member to the vehicle body, the resin case with its grounding portion establishes the electrical connection, simplifying the manufacturing process while maintaining the shielding effect.
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 configuration effectively suppresses the impact of magnetic fields on passengers while simplifying the design and reducing size, and avoids unnecessary shielding for low-potential wires, enhancing electromagnetic noise suppression and ease of fixation.
Implementation Method 1
a metallic shielding member covering the electric wire... the metallic member covering the opening of the resin case... suppress the radiation of an electromagnetic wave such as electromagnetic noise
Data Source
AI summary
A wire harness for high voltage, at least a portion of which is configured to be located inside a vehicle compartment separated by a body of a vehicle from an outside of the vehicle, the wire harness including: an electric wire; a metallic shield that covers the electric wire; a resin case that is configured to be disposed inside the vehicle compartment, wherein the resin case has a U-shaped transverse cross section and an opening that is configured to be on a side opposite to the body, and the electric wire and the shield are housed in the resin case; and a metallic cover that has a U-shaped transverse cross section, wherein the metallic cover covers the opening of the resin case and is configured to be open on a side facing the body.