Slit Metal Foil Shield for Wire Harness Bendability
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Solution Overview
Problem
Metal foil shield members in wire harnesses lack extensibility, leading to potential exposure of high-voltage conducting paths when bent, which compromises shielding effectiveness.
Innovation Solution
A metal foil shield member with strategically placed slits, wrapped at least twice around the conducting path to prevent slit overlap, ensuring continuous shielding even when the wire harness is bent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a metal foil shield member is used instead of a braided shield member, then weight is reduced and shielding effect is maintained, but extensibility deteriorates and bendability is affected
Solution Approach 1:
The metal foil shield member is divided into multiple segments by forming slits, allowing each segment to move independently during bending, thus providing extensibility while maintaining overall shielding effectiveness
Solution Approach 2:
The shield member has different properties in different regions: the slits are strategically positioned to allow local expansion and contraction for bendability, while the majority of the metal foil surface remains intact to maintain shielding effectiveness
2Ease of operation
If slits are provided in the metal foil to improve extensibility, then bendability is improved, but shielding effect deteriorates when slits are opened during bending
Solution Approach 1:
The shield member is wrapped around the conducting path multiple times (at least twice), creating multiple layers. When slits open in one layer during bending, the other layers remain intact and continue to provide shielding, effectively compensating for the opened slits through dimensional redundancy
Solution Approach 2:
The slits are pre-positioned in specific locations on the metal foil before wrapping. The positioning is calculated in advance to ensure that when the shield member is wrapped multiple times, the slits from different layers do not align, preventing continuous gaps that would compromise shielding
3Object-affected harmful factors
If the braided shield member uses a large number of strands (e.g., 300 strands), then shielding effect is improved, but weight increases
Solution Approach 1:
The invention changes the fundamental parameter of the shield member from a braided structure with many strands to a metal foil structure with slits. This parameter change maintains shielding effectiveness through the continuous metal surface while dramatically reducing weight by eliminating the complex multi-strand construction
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
Maintains shielding effectiveness and prevents exposure of the conducting path during bending, while allowing for weight reduction and improved flexibility.
Implementation Method 1
the braided shield member is provided in order to prevent a peripheral device from malfunctioning due to noise radiated from the high-voltage conducting path
Data Source
AI summary
A wire harness (9) includes two high-voltage conducting paths (15), an exterior member (16) which receives and protects the high-voltage conducting paths (15), and a metal foil shield member (17) which covers and shields the high-voltage conducting paths (15) collectively. The metal foil shield member (17) includes a flexible sheet-like shield member body (18), and a retention member (19) which is used after the shield member body (18) is wrapped around the high-voltage conducting paths (15). A plurality of slits 23 are formed in the shield member body (18). The numerous slits (23) are disposed in places so as not to overlap with each other vertically when the shield member body (18) is wrapped around the two high-voltage conducting paths (15) twice.