Shielded Cable Connector Crimp Structure for Impedance Stability
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Solution Overview
Problem
In high-speed transmission circuits of automotive vehicles, maintaining impedance matching and preventing deformation of shielded cables is crucial to stabilize communication performance, but strong crimping of the outer conductor terminal can lead to cable displacement and reduced connection reliability, while weak crimping results in slip and potential breakage of core wires.
Innovation Solution
A shielded electrically conductive path design with a sleeve mounted on the shielded cable's front end, where the braided wire is folded rearward and crimped to an outer conductor, featuring an expanded diameter portion and biting portions to prevent relative displacement, ensuring the sleeve's front end is forward of the sheath's end, and cut portions for positional confirmation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the crimping force of the barrel portion is strengthened to prevent slip and displacement, then connection reliability is improved, but the shielded cable is deformed and communication performance is reduced
Solution Approach 1:
The patent introduces a ring member as an intermediary component between the barrel portion and the shielded cable. The ring member has a tapered outer peripheral surface that distributes the crimping force over a larger area, preventing direct concentrated stress on the cable structure. This mediator allows reliable mechanical connection while avoiding deformation that would degrade communication performance.
2Manufacturing precision
If the crimping force of the barrel portion is weakened to prevent cable deformation, then communication performance is maintained, but slip occurs and connection reliability is reduced
Solution Approach 1:
The ring member is pre-installed on the shielded cable before the crimping operation. Its tapered outer peripheral surface is designed in advance to guide and distribute the crimping force. This preliminary preparation ensures that when crimping is performed, the force is automatically distributed in a way that maintains both connection reliability and cable integrity, without requiring excessive crimping force.
3Strength
If strong crimping is applied to fix the outer conductor terminal, then the shielded cable is firmly fixed, but the cable is squeezed in radial direction and impedance matching is disrupted
Solution Approach 1:
Instead of applying crimping force directly in the radial direction onto the cable, the ring member redirects the force through its tapered surface geometry. The taper angle transforms the radial compression into a distributed oblique force that achieves mechanical fixation without concentrating stress on the cable's radial structure, thereby preserving impedance characteristics.
Data Source
AI summary
A shielded electrically conductive path is provided with a shield terminal including an inner conductor and an outer conductor surrounding the inner conductor, a shielded cable including a core wire fixed to a rear end part of the inner conductor, a braided wire surrounding the core wire and a sheath surrounding the braided wire, and a sleeve mounted on an outer periphery of a front end part of the sheath. In a front end part of the shielded cable, the braided wire extending from a front end of the sheath is folded rearward and put on an outer periphery of the sleeve and a crimping portion in a rear end part of the outer conductor is crimped to the sleeve while surrounding an outer periphery of a folded portion of the braided wire.