Micro Plug Connector Double-Cover Metal Shell Design
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Solution Overview
Problem
Conventional Micro-USB plug connectors have a weak structure, with the metal shell not firmly mounted on the insulative housing, leading to easy disconnection when rotated relative to the cable, resulting in failure of signal transmission and poor performance in rotary tests.
Innovation Solution
A Micro-USB plug connector design featuring an insulative housing with a metal shell that includes positioning hooks and a double-covering mechanism using a front and rear cover to enhance structural strength and prevent inadvertent disassembly, comprising a base, tongue, terminals, and a metal shell with specific features like connecting plates and engaging members to secure the components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional Micro-USB plug connector uses a simple single-cover metal shell structure, then the device complexity is low and ease of manufacture is high, but the structural strength is weak and reliability is poor due to easy disconnection during rotation
Solution Approach 1:
The metal shell is divided into a front cover and a rear cover that separately engage with the insulative housing through different mechanisms (front cover with positioning hooks, rear cover with clamping arms), allowing each segment to provide specific structural reinforcement while maintaining overall assembly simplicity
Solution Approach 2:
The front cover and rear cover are nested together to form a complete metal shell enclosure around the insulative housing, with the connecting plate of the front cover extending through the rear cover to provide additional anchoring, creating a layered nested structure that enhances strength without proportionally increasing complexity
2Reliability
If the metal shell is loosely mounted on the insulative housing to ease assembly, then ease of manufacture is improved, but reliability deteriorates as the connector easily disconnects from cables during rotary tests
Solution Approach 1:
Positioning hooks are pre-formed on the front cover and engage with corresponding positioning protrusions on the insulative housing during assembly, establishing a predetermined reliable connection position before final assembly completion, ensuring consistent reliable mounting without complex assembly procedures
Solution Approach 2:
The connection mechanism extends from a simple planar attachment to a three-dimensional multi-point engagement system involving positioning hooks in vertical dimension, clamping arms in horizontal dimension, and the connecting plate extending through both covers, creating reliable attachment without complicating the manufacturing process
3Strength
If the connector structure is simplified to reduce manufacturing steps, then ease of manufacture is improved and productivity increases, but the structural strength decreases making the connector prone to failure under rotational stress
Solution Approach 1:
The front cover and rear cover are formed as integrated pieces including the positioning hooks and clamping arms as part of the cover structures themselves, merging multiple functional elements into unified components that can be manufactured in single stamping operations, maintaining productivity while achieving enhanced structural strength through the combined covering action
Data Source
AI summary
A micro plug connector has an insulative housing, a plurality of terminals, a pair of positioning hooks and a metal shell. The insulative housing has a base and a tongue protruding from the base. The terminals and positioning hooks are mounted through the base into the tongue. The metal shell covers the insulative housing and has a front cover and a rear cover. The front cover is mounted around the tongue and has a connecting plate protruding from the front cover and partially covering the bottom of the base. The rear cover formed on the front cover and covers the base and the connecting plate of the front cover. The front and rear covers double cover the insulative housing to strengthen the structures of the micro plug connector and prevent inadvertent disassembly or failure of the micro plug connector.