Electrical Connector TPA Structure With Integrated Primary Locking
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Solution Overview
Problem
Traditional electrical connectors face issues with terminal misalignment and loose connections due to insufficient retention mechanisms, especially in applications with vibration or mechanical stress, and existing terminal position assurance (TPA) devices and primary locking reinforcement (PLR) components are not adequately integrated.
Innovation Solution
An electrical connector design that integrates a TPA device within the housing, providing both terminal secondary locking and primary locking reinforcement, using cantilever structures and a main frame with pressing plates to enhance terminal retention, and includes a cable retainer for precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-piece plastic housing with integrated terminal cavities is used, then the device complexity is reduced, but the terminal retention reliability deteriorates under vibration or mechanical stress
Solution Approach 1:
The patent combines the TPA device and PLR structure into a single integrated component that performs both terminal positioning and primary locking reinforcement functions. The TPA device includes locking arms that engage with terminals while the integrated housing provides structural support, creating a unified assembly that maintains terminal retention under stress without requiring separate complex components.
Solution Approach 2:
The housing is divided into functional zones including terminal cavities with integrated locking mechanisms, cable receiving cavities, and mounting portions. The TPA device itself is segmented into multiple locking arms (lateral and longitudinal sides) that independently engage terminals, allowing each segment to perform specific retention functions while working together as a system.
2Reliability
If separate TPA devices and PLR components are used, then the terminal retention reliability is improved, but the device complexity and assembly time increase
Solution Approach 1:
The patent merges the TPA device with the PLR structure into a single integrated component. The TPA device includes both the terminal positioning features and the primary locking reinforcement elements, eliminating the need for separate PLR components. This integration maintains high terminal retention reliability while reducing the total component count and simplifying the overall device structure.
Solution Approach 2:
The TPA device is designed as a multi-functional component that simultaneously performs terminal positioning, secondary locking, and primary locking reinforcement. The locking arms can engage terminals laterally and longitudinally, providing multiple retention functions within a single device structure, thereby reducing the need for separate specialized components.
3Ease of manufacture
If friction or simple mechanical interference is used for terminal positioning, then the ease of manufacture is improved, but the terminal retention reliability deteriorates under vibration or mechanical stress
Solution Approach 1:
The terminal cavities are pre-configured with integrated locking arms and engagement features during housing manufacturing. The TPA device is designed to engage these pre-formed structures, creating a predetermined locking path that ensures reliable terminal retention. This preliminary structuring maintains manufacturing simplicity while providing robust mechanical interlocking that resists vibration and stress.
Solution Approach 2:
The locking arms are designed with elastic or flexible properties that allow them to dynamically adapt to terminal insertion while maintaining constant retention force. The arms can deflect during assembly to accommodate terminal positioning variations, then spring back to provide consistent locking pressure, combining ease of assembly with reliable retention under dynamic conditions.
Data Source
AI summary
An electrical connector includes a housing with a mating portion and a terminal mounting portion, featuring a terminal locking structure at the front and a cable receiving cavity at the rear. The housing comprises multiple terminal channels, including a lateral terminal channel and a middle terminal channel. The terminal locking structure is equipped with a lateral side terminal locking arm positioned on the lateral outside of the lateral terminal channel, and a longitudinal side terminal locking arm located on the longitudinal outside of the middle terminal channel. A terminal position assurance (TPA) device is configured to be mounted on the housing, exerting force on the lateral side terminal locking arm to move its free end towards the terminal channel, and similarly applying force to the longitudinal side terminal locking arm to direct its free end towards the terminal channel, ensuring secure terminal positioning within the connector.