Connector Position Assurance Device Pre-Lock Mechanism
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Solution Overview
Problem
Existing electrical connector assemblies face difficulties in securely connecting connectors due to the CPA device being placed in the final locking position before connector mating, leading to potential misconnection and inconvenience.
Innovation Solution
The CPA device is fixed to a pre-lock position on one of the connectors during shipping and only moves to the final lock position after the connectors are mated, utilizing a rib on the first connector to release the CPA device, which then restricts the primary locking member's movement with a secondary locking mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the CPA device is placed in the final locking position before connector mating, then the locking assurance is provided, but the connectors may be misconnected and it causes inconvenience to connect the connectors correctly
Solution Approach 1:
The CPA device is designed to be movable between a pre-lock position (for shipping) and a final lock position (for operation). The device transitions from a static pre-positioned state to a dynamic state where it moves to engage the secondary locking member only after the connectors are properly mated, resolving the contradiction between providing locking assurance and enabling easy connection.
Solution Approach 2:
The CPA device is preliminarily positioned in the pre-lock position during shipping, but it is designed to remain inactive until the connectors are mated. The rib on the first connector preliminarily guides the CPA device, and only after proper mating does the CPA device move to the final lock position to engage the secondary locking member, ensuring both ease of connection and locking assurance.
2Ease of manufacture
If the CPA device is fixed to the connector housing in a pre-locking position, then the connectors can be shipped together, but the CPA device must not move to the final locking position until the connectors are mated
Solution Approach 1:
The rib formed on the first connector acts as an intermediary mechanism. During shipping, the rib guides and restrains the CPA device at the pre-lock position. After mating, the rib releases the CPA device, allowing it to move to the final lock position and engage the secondary locking member, thus enabling both ease of manufacture and locking security.
Solution Approach 2:
The CPA device transitions from a static fixed position during shipping to a dynamic state after mating. The device is designed to move from the pre-lock position to the final lock position only when the connectors are properly mated, ensuring both shipping readiness and locking security.
3Reliability
If the CPA device moves to the final locking position after connectors are mated, then the primary locking members are restricted from disengagement, but the device complexity increases
Solution Approach 1:
The CPA device combines multiple functions into a single component: it serves as both a position indicator and a locking mechanism. The device integrates the movement from pre-lock to final lock position with the engagement of the secondary locking member, reducing the need for separate components and minimizing device complexity while maintaining high locking security.
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
An electrical connector assembly includes a first and a second connectors to be mated together, and a Connector Position Assurance (CPA) device installed on one of the first and second connectors. The CPA device is fixed to a pre-lock position when shipped together with said one of the connectors and before the first and second connectors are mated. At the pre-lock position, a locking lever on the second connector can be deformed so that primary locking members of the first and second connectors can be engaged. When the first and second connectors are mated, a rib formed on the first connector acts on a release member provided on the CPA device, to allow the CPA device to move to a final lock position at which, a secondary locking member restricts the movement of the primary locking member of the second connector to prevent the primary locking members from being disengaged.