Wire Harness with Interposed Braided Shield for Noise Suppression
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Solution Overview
Problem
Conventional wire harnesses in hybrid and electric vehicles fail to effectively suppress surge voltage due to impedance mismatch between inverters and motors, leading to excessive noise and voltage surges.
Innovation Solution
A wire harness design featuring three or more wires with a braided metal shield interposed between adjacent wires, collectively surrounding the outer circumference and approaching the central axis, effectively reducing capacitance and noise interference by creating a gap between wires and grounding the shield to absorb noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a collective shield structure is used to cover the outer circumferential portion, then noise suppression is improved, but surge voltage suppression remains insufficient
Solution Approach 1:
The shield member is segmented to be interposed between adjacent wires rather than forming a continuous outer cover. This segmentation allows the shield to directly suppress capacitance between individual wires, effectively reducing surge voltage while maintaining noise suppression capabilities.
Solution Approach 2:
The shield member acts as an intermediary element positioned between adjacent wires. By grounding the shield member, it serves as a reference potential that reduces voltage differences between wires, thereby suppressing surge voltage and improving reliability.
2Volume of moving object
If wires are arranged closely together, then the wire harness structure is compact, but capacitance between wires increases leading to higher noise and surge voltage
Solution Approach 1:
The shield member is inserted as an intermediary between closely arranged wires. This allows the wires to maintain close proximity for compactness while the grounded shield member reduces the electric field interaction between them, lowering capacitance and associated noise and surge voltage.
Solution Approach 2:
The invention changes the electrical parameter (capacitance) between wires by introducing the grounded shield member. This allows the physical arrangement to remain compact while the electrical characteristics are improved through the shield's presence and grounding.
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 design significantly reduces radiated noise and surge voltage by shielding direct wire interactions and increasing the distance between wires, thereby enhancing the suppression of noise and voltage surges.
Implementation Method 1
a shield member, wherein the three or more wires of the wire portion and the shield member are disposed such that the shield member is interposed between two wires of the wire portion adjacent to each other along a circumferential direction around a central axial line of the wire portion
Implementation Method 2
the shield member is grounded
Data Source
AI summary
A wire harness includes a wire portion formed by arranging three wires in the same direction, the respective wires having conductors and insulators coating outer circumferences of the conductors, and a braided wire. The three wires of the wire portion and the braided wire are disposed such that the braided wire is interposed between two wires of the wire portion adjacent to each other along a circumferential direction around a central axial line of the wire portion on a cross section of the wire harness when viewed from an axial direction along the central axial line, on a side of the central axial line from outer circumferential-side tangents connecting the conductors of the two wires.