Shielded Conduction Path with Reduced Diameter Fixing
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Solution Overview
Problem
Existing shielded conduction paths with metallic pipes and braided wires have a diameter increase due to crimp rings, which is undesirable, especially in high-voltage applications like hybrid automobiles, where space and cost are concerns.
Innovation Solution
A shielded conduction path design featuring a non-metallic pipe with a laminated electrically conductive shielding layer, reduced diameter portions, braided wires enveloping these portions, crimp rings that fix the wires within the reduced diameter area, and an exterior body that protects the assembly, reducing the overall diameter and eliminating the need for additional painting and parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If crimp rings are placed around the braided wire to fix it to the pipe, then the braided wire is securely fixed, but the external diameter increases
Solution Approach 1:
The crimp ring is nested within the reduced diameter portion of the pipe, placing the fixing mechanism inside the pipe's diameter rather than adding to it externally. The braided wire is enveloped by the pipe's reduced diameter portion, creating a nested structure that maintains compact external dimensions while achieving secure fixation.
Solution Approach 2:
The pipe features a localized reduced diameter portion with a specific cross-sectional shape designed to accommodate and compress the braided wire. This local structural modification provides the necessary fixing function without requiring the entire pipe to have a larger diameter, thus achieving secure fixation while maintaining compact overall dimensions.
2Reliability
If a metallic pipe is used for shielding, then shielding function is achieved, but the pipe requires painting and increases in diameter
Solution Approach 1:
The pipe is constructed as a composite structure with a non-metallic base material (such as resin) and an electrically conductive shielding layer (such as metal plating or conductive coating) applied to the inner surface. This composite design provides the necessary electromagnetic shielding function while using non-metallic material that does not require painting, eliminating the painting process and reducing manufacturing complexity.
3Reliability
If the braided wire is placed around the pipe with a crimp ring, then the wire is fixed, but the number of parts increases
Solution Approach 1:
The fixing function is merged into the pipe structure itself through the reduced diameter portion. The pipe's localized structural feature serves as both the mounting structure and the fixing mechanism, eliminating the need for separate crimp rings or additional fixing components. The braided wire is secured by the pipe's own geometric feature, reducing the total number of parts while maintaining reliable fixation.
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 design reduces the diameter of the fixed portion, minimizes the external diameter, and decreases the number of parts and painting steps, while maintaining shielding and protection from foreign objects, thus addressing space and cost concerns in high-voltage applications.
Implementation Method 1
a shielding layer that is electrically conductive, the non-metallic pipe main body has an electrically conductive shielding layer laminated thereon
Data Source
AI summary
A shielded conduction path that makes it possible to reduce the diameter of a portion where a braided wire is fixed to a pipe. The shielded conduction path includes a pipe that has a shielding function, reduced diameter portions that are formed in the outer circumference of the pipe, braided wires that have a shielding function and are arranged such that the base end portions thereof envelop the outer circumference of the reduced diameter portions, crimp rings that are arranged so as to envelop the outer circumference of the base end portions of the braided wires and fix the braided wires to the reduced diameter portions, and a conduction path main body that is inserted into the pipe and into the braided wires.