Wire Harness Shielding Separation
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Solution Overview
Problem
The complexity of shielding treatments in wire harnesses for hybrid and electric vehicles, particularly due to the use of metal pipes as shielding members, leads to increased man-hours, reduced design flexibility, and noise interference between high-voltage and low-voltage conductive paths.
Innovation Solution
A wire harness design where the metal pipe is used solely as an exterior member without shielding functions, allowing high-voltage conductive paths to be shielded independently, enabling the assembly of unshielded low-voltage conductive paths alongside, simplifying the structure and reducing noise influence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the metal pipe is used as a shielding member, then the shielding treatment can be performed, but the structure becomes complicated and man-hours increase
Solution Approach 1:
The shielding function is extracted from the metal pipe and assigned to a dedicated flexible shielding member. The metal pipe is used solely as an exterior member, while the flexible shielding member provides electromagnetic shielding for the conductive paths, separating the shielding function from the structural function.
Solution Approach 2:
The wire harness structure is segmented into distinct functional components: the metal pipe as exterior member, flexible shielding members for shielding, and conductive paths for electrical connection. This segmentation allows each component to perform its specific function independently, simplifying the overall structure.
2Object-affected harmful factors
If multiple types of conductive paths are shielded using multiple flexible shielding members, then noise shielding is achieved, but the shielding treatment becomes more complicated
Solution Approach 1:
Multiple conductive paths are bundled together and shielded by a single flexible shielding member that encompasses all of them. This merging approach reduces the number of separate shielding members needed, simplifying the shielding treatment while maintaining noise shielding effectiveness.
3Reliability
If the metal pipe is used as shielding member, then shielding is provided, but flexibility in designing circuit decreases
Solution Approach 1:
The shielding function is extracted from the rigid metal pipe and assigned to flexible shielding members that can be independently positioned and configured. This allows the conductive paths to be arranged flexibly within the metal pipe while still receiving adequate shielding.
4Device complexity
If high-voltage and low-voltage conductive paths are assembled together without separate shielding, then structure is simplified, but noise from high-voltage paths affects low-voltage paths
Solution Approach 1:
Flexible shielding members are introduced as intermediary elements between high-voltage and low-voltage conductive paths. These shielding members act as mediators that block electromagnetic noise from high-voltage paths from interfering with low-voltage paths, while allowing both types of paths to coexist in the same wire harness.
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 approach simplifies the shielding treatment, reduces man-hours, enhances design flexibility, and minimizes noise interference between high-voltage and low-voltage conductive paths within the wire harness.
Implementation Method 1
The high-voltage conductive path includes a shielding member that shields the high-voltage conductive path
Data Source
Figure 1
Figure 2
Figure 3(a)~3(b)
AI summary
A wire harness (9) is provided with a metal pipe (15), a high-voltage conductive path (16), and another conductive path (17). The other conductive path is configured as a non-shield wiring. The high-voltage conductive path contains a high-voltage circuit (20), a shield member (21), and an insulating member (22).