Coaxial Shield Sleeve Structure to Prevent Crimp Shift
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Solution Overview
Problem
In existing shield units, the coaxial electric wire and shield member can move apart when a pulling force is applied, leading to a deterioration in the reliability of the electrical connection between the electric wire shield and the shield member.
Innovation Solution
A shield unit configuration that includes a coaxial electric wire with an internal wire, an electric wire shield, and an outer skin, where a sleeve with a folded-back part of the electric wire shield is assembled, and a shield member with a crimping part is crimped to the outer periphery of the folded-back part, along with an outer skin crimping part on the coaxial electric wire side, which abuts when the wire and shield move apart, maintaining contact and preventing positional deviation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shield member is crimped to the folded-back part of the electric wire shield, then the electrical connection is established, but the crimping part may deviate when pulling force is applied, deteriorating connection reliability
Solution Approach 1:
The patent introduces an intermediary structure (the abutment part on the sleeve that contacts the outer skin crimping part) to prevent relative movement between the coaxial electric wire and shield member. This intermediary contact point ensures that when pulling force is applied, the crimping part maintains its position and the electrical connection reliability is preserved.
Solution Approach 2:
The outer skin crimping part is designed to crimp the outer skin in advance, creating a preliminary fixed structure. This preliminary crimping action establishes a stable base that prevents deviation of the shield crimping part when subsequent pulling forces are applied, thereby maintaining connection reliability.
2Adaptability or versatility
If the coaxial electric wire and shield member are allowed to move apart, then flexibility is improved, but the positional deviation of the crimping part deteriorates the electrical connection
Solution Approach 1:
The abutment part serves as an intermediary that allows controlled movement while preventing excessive separation. It maintains contact between the outer skin crimping part and the sleeve, ensuring the crimping part position remains stable even when the coaxial electric wire and shield member move relative to each other within acceptable limits.
Solution Approach 2:
The patent changes the physical state of the outer skin through crimping, creating a rigidified section that acts as a mechanical lock. This parameter change (from flexible to rigid) in the crimped region prevents deviation of the shield crimping part while allowing flexibility in other regions of the cable assembly.
Data Source
AI summary
A shield unit includes: an coaxial wire including an internal wire, a wire shield covering an outer periphery of the internal wire, and an outer skin covering an outer periphery of the wire shield; a sleeve assembled to a terminal where the wire shield is exposed from the outer skin, and having an outer periphery covered with a folded-back part of the wire shield which is folded back; and a shield member having a shield crimping part which is crimped to the outer periphery of the folded-back part. The shield member includes an outer skin crimping part which is disposed on the coaxial wire side from the shield crimping part, and crimped to the outer periphery of the outer skin. The sleeve includes an abutment part which abuts on the outer skin crimping part when the coaxial wire and the shield member move in the direction separated from each other.