Open-Barrel Crimp Structure for Shield Wire Fixation
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Solution Overview
Problem
Existing methods to enhance the fixing force of an outer conductor and a shield wire by increasing protrusions risk increasing mutual interference between adjacent protrusions.
Innovation Solution
A crimping structure with a base plate portion, extending portions, and claw portions that are cantilevered and bent inward to bite into the outer surface of the wire, with side edges of the claw portions shifted in the axial direction to avoid interference and ensure firm fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the number of protrusions is increased to enhance fixing force, then the fixing force between outer conductor and shield wire is improved, but the chance of mutual interference between adjacent protrusions increases
Solution Approach 1:
The patent applies dimensionality change by shifting the side edges of adjacent claw portions in the axial direction (adding a dimensional offset along the wire axis). This axial displacement separates the interference zones of adjacent claw portions, allowing more claw portions to be arranged circumferentially without mutual interference, thereby increasing both the fixing force and reducing interference risk simultaneously
2Strength
If more claw portions are arranged in the circumferential direction, then the fixing force is enhanced, but the axial length required for each claw portion must be reduced which may weaken individual claw effectiveness
Solution Approach 1:
The invention resolves this contradiction by utilizing the axial dimension to differentiate adjacent claw portions. By offsetting the axial positions of side edges of adjacent claw portions, each claw portion can maintain sufficient axial length for effective fixation while allowing more claw portions to be distributed around the circumference without overlapping or interfering with each other
Data Source
AI summary
This structure for crimping an electric wire and an outer conductor comprises an open-barrel crimping portion (25) which is provided on an outer conductor (16) to be connected to an end of a shield electric wire (10), and which is crimped on an outer periphery of the shield electric wire (10). The crimping portion (25) includes a substrate portion (26), a plurality of extending portions (28), and a plurality of claw portions (30). The substrate portion (26) is disposed so as to surround the outer periphery of the shield electric wire (10). The extending portions (28) extend in a cantilevered fashion from the rear edge of the substrate portion (26) rearward in the axial direction of the shield electric wire (10), and are disposed side by side in the circumferential direction of the shield electric wire (10). The plurality of claw portions (30) are formed by bending the rear end of the respective extending portions (28) inward in the radial direction of the shield electric wire (10), and dig into the outer surface of a sheath (14) of the shield electric wire (10). Between the claw portions (30) that are adjacent to each other in the circumferential direction, the side edges of the claw portions (30) that extend along the radial direction and are opposed to each other are displaced in the axial direction.