Wiring Member Braid Shield Axial Fixation
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Solution Overview
Problem
Existing wiring members with electromagnetic wave absorbers face issues where the magnetic body can move axially, failing to fix the absorber at an appropriate position, and require additional operations for covering, which complicates the structure and assembly.
Innovation Solution
A wiring member design incorporating a braid shield that covers the outer circumferential surface and axial end surfaces of a tube-shaped electromagnetic wave absorber, restricting its movement in the axial direction, with specific parameters for the number of carriers and ends of the braid shield to ensure effective fixation and assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the magnetic body is not covered with a covering member, then the structure is simpler, but the magnetic body moves in the axial direction and cannot be fixed at an appropriate position
Solution Approach 1:
The patent combines the covering member with the braid shield into a single integrated structure. The braid shield serves dual functions: providing electromagnetic shielding and acting as a covering member that prevents axial movement of the magnetic body. This merging eliminates the need for separate covering members while maintaining both shielding effectiveness and position fixation.
Solution Approach 2:
The braid shield is designed to perform multiple functions simultaneously: (1) electromagnetic wave shielding, (2) mechanical covering/protection of the magnetic body, and (3) axial position fixation through its specific braid configuration. This multi-functionality resolves the contradiction by making the shielding structure itself responsible for position fixation without adding separate components.
2Reliability
If a covering member is added to cover the shield layer and magnetic body, then the magnetic body position is fixed, but an additional operation for forming the covering member is required
Solution Approach 1:
The covering function is merged with the braid shield, which is already part of the standard wiring member structure. The braid shield's inherent flexibility and coverage characteristics allow it to serve as both shield and cover, eliminating the need for separate covering member formation operations.
Solution Approach 2:
The braid shield's specific configuration (with 1≤n≤15 carriers and 10≤m≤50 ends) enables it to self-restrict the axial movement of the magnetic body through its braided structure's mechanical interlocking, without requiring additional fixing operations or components.
3Reliability
If the number of carriers and ends of the braid shield are optimized, then the movement restriction is effective, but the braid shield configuration becomes more specific
Solution Approach 1:
The patent specifies optimal parameter ranges for the braid shield configuration (1≤n≤15 carriers, 10≤m≤50 ends) to achieve effective movement restriction. These parameter definitions provide clear design guidelines that balance movement restriction effectiveness with manufacturing feasibility, transforming a complex design problem into a standardized specification.
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 solution simplifies the structure by restricting the movement of the electromagnetic wave absorber without additional fixing members, facilitating assembly and maintaining effective noise reduction by absorbing electromagnetic waves emitted from electric wires.
Implementation Method 1
The electromagnetic wave absorber absorbs electromagnetic waves emitted from the electric wire
Data Source
AI summary
A wire harness includes first to third electric wires, a braid shield that covers the first to third electric wires, and a tube-shaped electromagnetic wave absorber having a through hole that allows the first to third electric wires to be inserted therethrough, the electromagnetic wave absorber absorbing electromagnetic waves emitted from the first to third electric wires. The braid shield covers an outer circumferential surface and two axial end surfaces of the electromagnetic wave absorber to restrict movement of the electromagnetic wave absorber in an axial direction. The braid shield satisfies 1≦n≦15 and 10≦m≦50 where the number of carriers of the braid shield is denoted by n and the number of ends of the braid shield is denoted by m.