Front-Loaded TPA Device for Electrical Connector Sealing
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Solution Overview
Problem
Existing terminal position assurance (TPA) devices in electrical connectors are prone to side loading, which creates open areas in the housing, allowing tooling flash, water ingress, and dust/dirt ingress, leading to reliability and functionality issues in automotive systems.
Innovation Solution
A front-loaded TPA device with latches and a locking block is integrated into the electrical connector, eliminating side loading by using a central cavity and perimeter cavities to secure terminals, providing centralized latching and a sealed interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If side-loaded TPA devices are used to ensure terminal positioning, then terminal position assurance is achieved, but open areas in the housing are created allowing environmental ingress
Solution Approach 1:
The patent inverts the traditional side-loading approach by implementing a front-loading TPA device that inserts through the mating end of the housing. This reversal of the loading direction eliminates the need for side openings, thereby preventing environmental ingress while maintaining terminal position assurance functionality
Solution Approach 2:
The patent transitions from side-loading (lateral dimension) to front-loading (longitudinal dimension) the TPA device. By changing the loading dimension from side access to front access through the mating end, the design maintains TPA functionality while eliminating open areas in the housing sides
2Object-affected harmful factors
If front-loaded TPA device is used to eliminate side openings, then environmental ingress is reduced, but device complexity increases
Solution Approach 1:
The patent combines multiple functions into a single integrated TPA device structure that includes the outer frame, latches, and locking block as one unit. This merging of components simplifies the overall device while achieving the goals of environmental sealing and terminal position assurance through front-loading
3Reliability
If latches with latching fingers are used to block terminal removal, then terminal positioning is secured, but device complexity increases
Solution Approach 1:
The latches are designed to automatically engage with the terminals through the latching fingers when the TPA device is inserted. The self-actuating mechanism eliminates the need for additional actuators or complex control systems, securing terminal positioning through the inherent mechanical interaction between the latches and terminals
Data Source
AI summary
An electrical connector includes a housing having terminal towers extending forward of a base toward a mating end each. The terminal towers are spaced apart by gaps and the gaps define a central cavity between the terminal towers. A TPA device is received in the central cavity and is front loaded into the central cavity through the mating end in a loading direction toward the base. The TPA device includes a plurality of latches received in corresponding terminal towers having latching fingers positionable in terminal channels in blocking positions to block removal of terminals. The TPA device includes a locking block received in the central cavity to lock the TPA device in the central cavity. The locking block is positioned relative to the latches to hold the latches in the blocking positions.