Wiring Harness Tubular Shielding Composite Metallic Film Braid
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Solution Overview
Problem
Conventional tubular braided shielding members lack the strength to accommodate a large number of electrical wires, and tubular metallic film members are difficult to manufacture with varying diameters and have inadequate tensile strength, leading to reduced connection reliability and increased costs.
Innovation Solution
A wiring harness with a tubular shielding member that combines a metallic film body portion for electromagnetic shielding and a braided terminal portion for flexibility, allowing the wires to be bundled and arranged efficiently, with the braided portion providing stretch properties and the metallic film offering enhanced shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a tubular braided member is used as a shielding member, then it has stretch properties and can accommodate bundled electrical wires, but it cannot bear relatively heavy members comprised of 300 element wires or above
Solution Approach 1:
The shielding member is constructed as a composite structure combining a metallic film layer and a braided member layer. The metallic film provides continuous electromagnetic shielding, while the braided member provides stretch properties and mechanical strength. This composite structure resolves the contradiction by integrating the advantages of both materials to achieve both adaptability and strength.
2Object-affected harmful factors
If a tubular metallic film member is used as a shielding member, then it provides electromagnetic shielding, but it lacks stretch properties and has inadequate tensile strength
Solution Approach 1:
The shielding member combines metallic film and braided member in a composite structure. The metallic film layer provides continuous electromagnetic shielding coverage, while the braided member layer provides stretch properties and flexibility. This allows the shielding member to adapt to bundled electrical wires while maintaining effective electromagnetic shielding.
3Ease of manufacture
If the tubular shielding member has constant width, then it is easy to manufacture, but it requires relatively huge space for arranging electrical wires
Solution Approach 1:
The shielding member transitions from a constant width structure to a dynamic structure with variable diameter. The diameter varies along the length to match the bundle shape of electrical wires, being larger at ends where wires spread out and smaller in the middle where wires are tightly bundled. This reduces the overall space requirement while accommodating the natural geometry of wire bundles.
4Volume of moving object
If the tubular shielding member has varying diameter to match bundle shape, then it reduces space requirement, but it is difficult and cost-consuming to manufacture
Solution Approach 1:
The shielding member is divided into two separate components: a metallic film layer and a braided member layer. Each layer can be manufactured independently with standard processes, and then they are combined. This segmentation allows the varying diameter shape to be achieved more easily by forming each layer separately and combining them, reducing manufacturing complexity compared to creating a single-piece variable diameter structure.
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 results in a downsized, weight-saved wiring harness with improved workability and connection reliability, maintaining effective electromagnetic shielding while allowing for easy assembly and reduced terminal connection issues.
Implementation Method 1
a tubular shielding member configured to receive the plurality of electrical wires as a whole therein... the shielding body portion is formed of metallic film and the shielding terminal portion is formed of braid
Data Source
AI summary
The invention relates to a wiring harness having a plurality of electrical wires and a tubular shielding member capable of accommodating the plurality of electrical wires as a whole therein. The wiring harness includes a plurality of electrical wires; and a tubular shielding member configured to receive the plurality of electrical wires as a whole, and coupled to a shield part of a device side via a tubular terminal portion thereof. The tubular shielding member includes a shielding body portion disposed over a bundled portion in which the plurality of electrical wires is bundled as a whole, and a shielding terminal portion disposed over an enlarged portion which gradually enlarges from the bundled portion in conformity with terminal arrangement of the plurality of electrical wires or a shape of the shield part of the device side, and continuous with at least one end of the shielding body portion. The shielding body portion is formed of metallic film and the shielding terminal portion is formed of braid.