Coaxial Terminal Fitting Cover for Shield Current Continuity
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Solution Overview
Problem
High-frequency performance is compromised in shielded cables due to the open tool insertion opening in the shielding outer tube, which impedes current flow and reduces signal transmission efficiency.
Innovation Solution
A terminal fitting design with a center conductor crimping portion inside a coupling, a shield crimping portion, and a cover that closes the opening to ensure electrical contact with the outer conductor, enhancing current flow and high-frequency performance by preventing the expansion of shield crimping pieces and maintaining a stable circular cross-section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an opening is provided in the shielding outer tube for tool insertion, then assembling efficiency is improved, but high frequency performance deteriorates due to impeded current flow
Solution Approach 1:
A cover member is introduced as an intermediary component that bridges the opening in the shielding outer tube. The cover member includes a conductive portion that electrically connects the inner conductor to the shielding outer tube through the opening, thereby maintaining current flow continuity and high frequency performance while allowing tool access for assembly operations.
2Ease of operation
If the resilient piece is exposed on the outer surface for crimping operation, then ease of operation is improved, but the resilient piece is damaged during transportation
Solution Approach 1:
The resilient piece is preliminarily positioned inside the inner conductor body before transportation and assembly. The inner conductor body serves as a protective housing that safeguards the resilient piece during handling and transportation. The resilient piece is only exposed when needed for the crimping operation, allowing it to remain protected until the moment of use.
3Productivity
If the shield crimping portion is left open, then assembling efficiency is improved, but the shield crimping pieces expand and high frequency performance deteriorates
Solution Approach 1:
The cover member acts as an intermediary that closes the opening in the shielding outer tube after assembly. The conductive portion of the cover member maintains electrical continuity while the cover body prevents the shield crimping pieces from expanding, thereby preserving the circular cross-section and high frequency performance without compromising assembly efficiency.
Data Source
AI summary
A terminal fitting (T) includes an inner conductor (11) having a center conductor crimping portion (18) to be crimped to a center conductor of a shielded cable (W) and an outer conductor (12) having a coupling (35). The center conductor crimping portion (18) is disposed inside the coupling by assembling the inner conductor (11). Openings (43, 44) open in the coupling (35) and enable tools to be applied to the center conductor crimping portion. A shield crimping portion (36) is connected to the coupling (35) and to be crimped to a shield layer of the shielded cable W. A dielectric (13) is interposed between the outer and inner conductors (12, 11), and a cover (14) is configured to close the openings (43, 44) and electrically contact the outer conductor (12). The cover (14) has locking pieces (96) that are to be bent and locked into a locking hole (47) of the shield crimping portion (36).