Electrical Connector Retention Mechanism Using Resilient Nib and Terminal Tabs
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Solution Overview
Problem
Existing electrical connectors face challenges in securely retaining terminals within connector bodies, particularly in preventing accidental dislodgment under pulling forces from wires, often requiring tools for removal.
Innovation Solution
The design incorporates a female terminal with recesses and tabs that interact with a connector body's nib and rails, allowing secure insertion and retention through a combination of mating surfaces and resilient structures, preventing unintended withdrawal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If terminals are secured in place requiring a tool for removal, then retention strength is improved, but ease of operation deteriorates
Solution Approach 1:
The connector employs a dynamic retention mechanism where the resilient nib can flex between engaged and disengaged states. During insertion, the nib flexes to allow terminal entry, then springs back to lock the terminal in place. For removal, applying force in the release direction causes the nib to flex again and disengage, enabling tool-free operation while maintaining strong retention during normal use.
Solution Approach 2:
The design incorporates preliminary anti-action through the resilient nib structure that预先 (in advance) prepares the retention mechanism. The nib is pre-loaded in a biased state that automatically engages with the terminal recess upon insertion, preventing accidental dislodgment before any removal action is attempted. The opposing force direction requirement ensures that retention is maintained until deliberate release action is taken.
2Ease of operation
If terminals are easily removable without tools, then ease of operation is improved, but retention strength deteriorates
Solution Approach 1:
The resilient nib creates a dynamic retention system that adapts to different operational states. In the engaged state, the nib maintains strong retention force through its spring bias. In the release state, when force is applied in the release direction, the nib flexes to disengage, allowing easy removal. This dynamic behavior resolves the contradiction by providing both strong retention and ease of removal through the same mechanism.
Solution Approach 2:
The retention parameter changes based on the operational state. During normal operation, the nib maintains high retention force through its pre-loaded spring state. During removal, the parameter changes as the nib flexes and transitions to a disengaged state, reducing retention force to enable easy removal. This parameter change allows the system to satisfy both strong retention and ease of removal requirements.
3Reliability
If complex retention mechanisms are used to prevent accidental dislodgment, then reliability is improved, but device complexity increases
Solution Approach 1:
The retention mechanism is segmented into distinct functional elements: the resilient nib with its biasing feature, the terminal recess, and the force direction requirements. This segmentation allows each element to perform its specific function simply - the nib provides resilient engagement, the recess provides the locking interface, and the force direction constraint prevents accidental release. The segmented design achieves reliable retention without requiring a complex integrated mechanism.
Solution Approach 2:
The design applies local quality by concentrating the retention function in the specific region of the resilient nib and terminal recess interface, rather than distributing complexity throughout the entire connector. The resilient nib's local spring bias and the recess's geometric configuration create reliable retention at the critical interface point, while the rest of the connector remains simple in structure.
Data Source
AI summary
An electrical connector includes a terminal and a connector body. The terminal has a recess and has one or more tabs. The connector body has a cavity that is constructed and sized to receive the terminal. The connector body has a nib protruding into the cavity, and has one or more rails protruding into the cavity. When the terminal is received in the cavity, the nib mates with the recess and the tab bears against the rail.