Shielded Wire Connector Support Ring for Uniform Ground Contact
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Solution Overview
Problem
Existing connectors for shielded electric wires experience non-uniform contact pressure of the shield terminal in the circumferential direction due to manufacturing errors, leading to increased ground resistance when the central axis of the shield terminal is offset from the through hole.
Innovation Solution
A connector design featuring a tubular resin housing, a metal shield terminal with a leaf spring, a sealing member, and a support member made of resin to ensure uniform contact pressure by aligning the central axis of the shield terminal with the through hole, using a support member to suppress axis offset.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the connector is fixed to the metal panel with standard manufacturing tolerances, then the manufacturing precision is improved, but the contact pressure uniformity deteriorates due to axis offset
Solution Approach 1:
The support member is pre-installed on the shield terminal before assembly, establishing a reference structure that guides the shield terminal into proper alignment with the through hole during the assembly process, thereby preventing axis offset before it occurs
Solution Approach 2:
The support member acts as an intermediary component between the shield terminal and the metal panel, providing a mechanical reference that ensures the shield terminal's axis aligns with the through hole's axis, thus mediating the alignment between these two components
2Reliability
If the shield terminal is made with a leaf spring structure to provide contact pressure, then the grounding reliability is improved, but the contact pressure becomes non-uniform when axis offset occurs
Solution Approach 1:
The support member is installed in advance to establish proper axis alignment, ensuring that when the leaf spring makes contact with the inner surface of the through hole, the contact occurs at the correct position, thereby ensuring uniform contact pressure distribution
Solution Approach 2:
The support member serves as a mediator that transmits the alignment requirement from the through hole to the shield terminal, ensuring that the leaf spring's contact point on the inner surface of the through hole is properly positioned to achieve uniform contact pressure
3Device complexity
If no support member is used to simplify the structure, then the device complexity is reduced, but the axis alignment cannot be maintained
Solution Approach 1:
The support member acts as a simple intermediary component that provides a mechanical reference for alignment, enabling the shield terminal to be properly positioned relative to the through hole without requiring complex alignment mechanisms or procedures
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
The design effectively suppresses non-uniformity in contact pressure, reducing ground resistance and ensuring consistent electromagnetic shielding by maintaining alignment with the through hole.
Implementation Method 1
another end side folded outward to form a leaf spring that generates a biasing force in a radially expanding direction
Implementation Method 2
a sealing member formed of an elastic resin in a tubular shape to seal between the housing and an object inserted in the through hole
Data Source
AI summary
A connector for a shielded electric wire includes: a shield terminal connected to a braid on one end side thereof and grounding the braid by contact at a leaf spring on the other end side thereof; a first packing (sealing member) that seals between a housing and an object inserted into a through hole from an inner surface of the housing to an inner surface of the through hole; and a support member that is a resin ring exteriorly mounted on the shield terminal to be adjacent to the leaf spring and disposed inside the through hole in such a manner that an outer circumferential edge thereof is in contact with the inner surface of the through hole, thereby suppressing an offset of a central axis of the shield terminal with respect to a central axis of the through hole.