Shielding Braided Member Segmentation for Conduction Reliability
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Solution Overview
Problem
Existing braided members used for electromagnetic shielding of electric wires, which combine metal and resin wires, face challenges in maintaining reliable conduction due to thermal creep of resin wires, leading to increased contact resistance, especially in high-temperature environments.
Innovation Solution
A shielding structure that includes a braided member with a metal braided portion without resin wires, crimped to a conductive member for reliable conduction, and a mixed braided portion with resin wires, crimped separately to ensure firm fixation, using crimp fixing portions to establish and maintain electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If resin wires and metal wires are combined in a braid to reduce weight, then weight is reduced, but thermal creep of resin wires increases contact resistance between the braid and conductive member
Solution Approach 1:
The braided member is segmented into two distinct portions: a mixed braided portion containing both resin wires and metal wires for weight reduction, and a metal braided portion containing only metal wires for reliable conduction. This segmentation allows each portion to fulfill its specific function without compromising the other.
Solution Approach 2:
Different portions of the braided member are assigned different material compositions based on local functional requirements. The mixed braided portion uses resin and metal wires where weight reduction is prioritized, while the metal braided portion uses only metal wires where electrical conduction reliability is prioritized.
2Weight of moving object
If resin wires are used in the braid for weight reduction, then weight is reduced, but fixation reliability to conductive member deteriorates due to thermal creep
Solution Approach 1:
The braided member is divided into a mixed braided portion for weight reduction and a metal braided portion for stable fixation. The metal braided portion specifically addresses the fixation stability issue by excluding resin wires that are prone to thermal creep.
Solution Approach 2:
The metal braided portion is specifically designed with metal-only composition at the location where fixation to the conductive member occurs, ensuring thermal stability and prevention of thermal creep in the critical fixation zone.
3Weight of moving object
If resin wires are crimped to conductive member, then weight is reduced, but conduction establishment becomes difficult due to thermal creep
Solution Approach 1:
The crimping operation is segmented into two stages: first crimping the metal braided portion to establish reliable conduction, then crimping the mixed braided portion for additional fixation. This segmentation ensures conduction is established by the thermally stable metal portion first.
Solution Approach 2:
The metal braided portion is crimped to the conductive member first to establish reliable conduction before the resin wires are crimped. This preliminary action ensures that conduction is already established by the thermally stable metal wires before any resin wires are introduced to the crimping zone.
4Weight of moving object
If metal wires and resin wires are braided together, then weight is reduced, but conduction reliability between braid and conductive member decreases
Solution Approach 1:
The braided member is segmented into a mixed braided portion and a metal braided portion. The metal braided portion specifically addresses conduction reliability by containing only metal wires, while the mixed portion maintains weight reduction benefits.
Solution Approach 2:
The metal braided portion is positioned at the location where conduction to the conductive member is critical, ensuring that the most reliable conduction path exists at the interface with the conductive member.
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 solution enhances the reliability of the conductive connection between the braided member and the conductive member by preventing thermal creep and ensuring strong fixation, reducing the number of components and increasing the reliability of the electromagnetic shielding.
Implementation Method 1
a plurality of conductive metal wires (301) and a plurality of resin wires (303) are braided together to form a shielding braided member (30)
Implementation Method 2
a crimp fixing portion (35) with which the metal braided portion (31) is crimped and fixed to the conductive member (51)
Data Source
AI summary
A shielding structure includes a shielding braided member that is a braided member obtained by braiding a plurality of resin wires and a plurality of conductive metal wires together and arranged to achieve shielding of an electric wire, a shell that is connected to one end of the shielding braided member; and a crimp fixing portion with which the one end of the shielding braided member is crimped and fixed to the shell such that electric conduction is established. The shielding braided member includes a metal braided portion that contains no resin wires and that is formed by braiding the plurality of metal wires, and the metal braided portion in the shielding braided member is crimped and fixed to the shell with a crimp ring of the crimp fixing portion.