Connector Assembly With Elastic TPA Locking Against Contact Separation
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Solution Overview
Problem
Connectors often experience poor connection due to incomplete assembly or disengagement of contacts caused by vibration, leading to separation issues during the assembly process.
Innovation Solution
A connector assembly incorporating an elastic terminal position assurance (TPA) member with a hinge portion and latch, which engages with a coupling groove to ensure contacts are properly seated and locked in place, preventing disengagement and indicating incomplete assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If contacts are left loose for easy assembly, then assembly ease is improved, but connection reliability deteriorates due to separation from vibration
Solution Approach 1:
The TPA member is pre-positioned in the housing to engage with the coupling groove on the contact before final assembly completion. This preliminary positioning ensures that when the contact is inserted, the TPA member guides it into the correct position and then locks it in place, preventing subsequent separation from vibration while maintaining assembly simplicity
Solution Approach 2:
The TPA member acts as an intermediary between the contact and the housing. It mediates the connection by engaging with the coupling groove on the contact and securing it to the housing, providing both guidance during assembly and secure retention during operation, thus resolving the contradiction between ease of assembly and connection reliability
2Reliability
If TPA member is added to ensure contact positioning, then connection reliability is improved, but device complexity increases
Solution Approach 1:
The TPA member is designed to perform multiple functions: it guides the contact into position during assembly, locks the contact securely to prevent separation, and provides visual feedback through its positioned state. By consolidating these functions into a single component, the design achieves high contact positioning accuracy without proportionally increasing device complexity
Solution Approach 2:
The TPA member is designed to be self-actuating through the elastic deformation of the contact. As the contact is inserted and deforms elastically, it automatically engages with the TPA member's coupling groove, triggering the TPA member to move into its locking position without requiring additional actuators or complex mechanisms, thus maintaining simplicity while ensuring reliable positioning
3Reliability
If elastic TPA member is used to lock contacts, then contact security is improved, but manufacturing precision requirements increase
Solution Approach 1:
The TPA member is designed with specific elastic parameters that allow it to deform and accommodate minor variations in contact positioning. The elastic material properties and geometric design of the TPA member create a tolerance buffer, enabling it to securely engage with contacts even when manufacturing precision varies within acceptable ranges, thus achieving high contact security without requiring extremely tight manufacturing tolerances
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The TPA member effectively secures contacts at designated positions, preventing disconnection and ensuring reliable electrical coupling by confirming and maintaining the correct alignment of receptacle and tab contacts within the connector assembly.
Implementation Method 1
an elastic terminal position assurance (TPA) member... The latch is formed such that the other end of the TPA member engages with the coupling groove
Data Source
AI summary
A connector assembly comprises a body and an elastic terminal position assurance (TPA) member. The body includes a plurality of contacts and defines a coupling groove exposing some of the plurality of contacts. The TPA member includes a hinge portion and a latch, and is adapted to indicate whether the plurality of contacts are sitting at designated positions. The hinge portion is hinged with respect to the body on one end of the TPA member. The latch is formed such that the other end of the TPA member engages with the coupling groove.