Internal TPA Connector Locking for Compact Terminal Retention
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Solution Overview
Problem
Existing electrical connectors lack effective terminal position assurance, leading to potential misalignment and unintended withdrawal of terminal segments during mating, which can result in unreliable connections in complex wiring systems like vehicle wiring systems where space is limited.
Innovation Solution
The design incorporates a terminal position assurance member with a locking mechanism that includes a retention detent and a locking detent, which moves between a pre-lock and final lock position, providing visual, tactile, and audible feedback to ensure proper terminal positioning and prevent unintentional removal, with the entire mechanism being housed within the female connector to maintain a low profile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a terminal position assurance member is inserted from the side or bottom of the female housing with a portion extending outside, then terminal positioning can be assured, but the connector size increases and space is consumed
Solution Approach 1:
The terminal position assurance member is nested within the female housing, with the arm and detents contained inside the housing boundaries when locked. This nesting approach maintains terminal positioning reliability while eliminating the need for external protruding components, thereby reducing overall connector volume.
Solution Approach 2:
The locking mechanism transitions from a side or bottom insertion approach to a vertical movement approach along the mating direction. The arm moves vertically between unlocked and locked positions, utilizing the vertical dimension within the housing to achieve positioning assurance without increasing horizontal footprint.
2Reliability
If a locking mechanism with detents is used to prevent unintended withdrawal, then connection reliability improves, but the device complexity increases
Solution Approach 1:
The locking function is extracted into a dedicated terminal position assurance member with a simplified arm and detent structure. This separate component focuses solely on the locking function, making the overall system more modular and easier to manufacture while maintaining high connection reliability through the detent engagement mechanism.
Solution Approach 2:
The locking mechanism is designed to be self-actuating through vertical movement of the arm. The detents automatically engage with corresponding features in the housing during the locking process, eliminating the need for additional actuators, springs, or complex control mechanisms. The arm's own movement provides the necessary force for engagement.
3Manufacturing precision
If visual, tactile, and audible feedback mechanisms are added to confirm proper installation, then installation accuracy improves, but the device complexity increases
Solution Approach 1:
The locking mechanism incorporates multiple feedback modalities: visual feedback through the position of the arm relative to the housing, tactile feedback through the engagement feel of the detents, and audible feedback through the click sound of detent engagement. These feedback mechanisms are inherent to the mechanical design rather than added electronic or optical systems, providing installation confirmation without significantly increasing complexity.
4Volume of moving object
If the terminal position assurance member is fully contained within the housing, then connector profile is reduced, but accessibility for installation may be limited
Solution Approach 1:
The terminal position assurance member is pre-positioned within the female housing during assembly, with the arm initially in an unlocked position that allows easy access. The member is prepared in advance to receive the terminal, and the locking action occurs automatically or with minimal user input during the terminal insertion process, maintaining both compact profile and installation ease.
Data Source
AI summary
An electrical connector is provided. The electrical connector can include a female housing and a terminal position assurance member forming a pre-installed assembly. The TPA member can be in a final lock position to provide reinforcement or secondary locking for a terminal, and terminal position assurance. A male housing can be provided to receive the assembly.