Electrical Plug Connector Shell Fixing Structure
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Solution Overview
Problem
Conventional USB electrical plug connectors lack a structure to fix the front and rear shells effectively, leading to gaps and increased electromagnetic interference (EMI) and radio frequency interference (RFI), which compromise signal transmission and user experience.
Innovation Solution
The design includes a metallic shell with a front and rear cover portion, where the rear cover portion extends to receive the base member, and a front extending plate is propped on the rear cover portion to fix the shells together, eliminating gaps and providing effective shielding. Additionally, the upper and lower plug terminals are 180-degree symmetrical, allowing dual orientation insertion, and clamping sidewalls secure the circuit board for improved noise conduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the front shell and rear shell are combined without a fixing structure, then the device complexity is reduced, but the shielding effect deteriorates due to gaps between shells
Solution Approach 1:
A fixing structure comprising a fixing plate and fixing protrusions is introduced as an intermediary element between the front shell and rear shell. The fixing plate is disposed in the rear shell with fixing protrusions extending toward the front shell, creating a mechanical connection that eliminates gaps while maintaining shielding effectiveness without significantly increasing overall device complexity.
2Object-affected harmful factors
If the front shell and rear shell are properly fixed together, then the shielding effect is improved, but the device complexity increases due to additional fixing structures
Solution Approach 1:
The fixing structure is merged with the existing shell components. The fixing plate is integrated into the rear shell, and the fixing protrusions are formed as part of the shell structure rather than separate components. This merging approach provides effective RFI shielding while minimizing the increase in assembly complexity.
3Ease of manufacture
If the shells are improperly positioned, then the manufacturing process is simplified, but the positioning precision deteriorates leading to gaps and exposure of internal components
Solution Approach 1:
The fixing protrusions are designed to automatically engage with corresponding recesses in the front shell during assembly. This self-aligning mechanism guides the shells into proper positioning without requiring complex external fixtures or precision alignment tools, thereby maintaining ease of manufacture while achieving high positioning accuracy.
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
This solution prevents RFI issues by ensuring proper shielding, maintains signal consistency, and reduces EMI by grounding noise, while allowing the connector to be inserted in either orientation without affecting signal transmission specifications.
Implementation Method 1
the metallic shell covers the insulated housing to provide a shielding effect during signal transmission
Implementation Method 2
the front extending plate and the rear cover portion are fixed by soldering techniques
Data Source
AI summary
An electrical plug connector includes an insulated housing and a metallic shell. The insulated housing includes a base member, an upper portion, a lower portion and defines a mating room between the upper portion and the lower portion. The upper portion and the lower portion are extending from one side of the base member. The metallic shell encloses the insulated housing, and includes a front shell and a rear shell. The front shell includes a front cover portion and a rear cover portion. The rear cover portion is extending from a rear side of the front cover portion. The rear shell encloses the front side of the base member and includes a front extending plate propped on the rear cover portion, so that the front shell and the rear shell are fixed with each other.