Connector Assembly CPA Member Mating Detection
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Solution Overview
Problem
Existing connectors in the automotive industry face challenges in ensuring proper mating, particularly in environments with supplemental stops, where visual inspection may not reliably confirm connection integrity, and existing Connection Position Assurance (CPA) members are not universally compatible with or without supplemental stops.
Innovation Solution
A connector assembly design featuring a CPA member with a free end portion that stands outside the area occupied by a supplemental stop, allowing for proper mating detection regardless of the presence of a supplemental stop, and an elastic locking pawl mechanism with a slanted rear wall and aperture for screwdriver-assisted disengagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a CPA member with a lifting finger is provided to ensure proper mating detection, then connection assurance is improved, but the device complexity increases
Solution Approach 1:
The CPA member integrates multiple functions: the lifting finger detects proper mating by engaging the locking pawl, while the CPA pawl itself serves as both a detection element and a visual indicator. This merging of detection and indication functions into a single component achieves connection assurance without adding separate complex systems.
Solution Approach 2:
The CPA member utilizes the existing locking mechanism's movement to trigger its own detection function. When the locking pawl engages the locking stop, it automatically lifts the lifting finger, which in turn moves the CPA pawl to its final position. The system uses its own operational movements to activate the detection mechanism, eliminating the need for external actuators or additional sensors.
2Measurement precision
If the CPA pawl is positioned to engage the locking pawl for detection, then mating detection is improved, but compatibility with supplemental stops deteriorates
Solution Approach 1:
The CPA pawl is designed with a specific geometric configuration where its front end portion engages the locking pawl at a localized point. This localized engagement point is positioned such that it remains accessible regardless of whether a supplemental stop is present. The CPA pawl's shape and position create a local interaction zone that is independent of the supplemental stop's presence, enabling both precise detection and broad compatibility.
Solution Approach 2:
The connector assembly is designed to function universally with or without supplemental stops. The CPA member's detection mechanism engages the locking pawl in a way that is compatible with both configurations. The lifting finger and CPA pawl arrangement ensures that the detection function operates correctly whether the supplemental stop is present to limit clearance or absent, making the connector assembly adaptable to different design variations.
3Reliability
If a supplemental stop is added to limit clearance in high vibration environments, then reliability is improved, but the device complexity increases
Solution Approach 1:
The supplemental stop is positioned to preemptively limit the clearance of the locking pawl before excessive movement can occur during high-vibration conditions. By providing this preliminary mechanical constraint, the system prevents potential connection instability without requiring active control systems or complex adjustment mechanisms. The supplemental stop acts as a passive preventive measure against vibration-induced disconnection.
4Ease of operation
If the locking pawl is designed with elastic properties for locking engagement, then ease of operation is improved, but manufacturing precision requirements increase
Solution Approach 1:
The locking pawl's elastic properties are defined by specific material selection and geometric parameters rather than requiring extremely tight manufacturing tolerances. The elastic deformation capability allows the pawl to accommodate reasonable variations in manufacturing while still achieving reliable locking engagement. By designing for elastic compliance rather than rigid precision, the system maintains ease of operation with achievable manufacturing precision levels.
Data Source
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AI summary
The present invention regards a connector assembly which comprises first and second connectors (102, 104). The first connector (102) comprises a locking pawl (112) with a first locking stop (118) intended to raise in an upward direction (UD), so as to engage a second locking stop (134) of the second connector (104) when the connectors (102, 104) are mated. The first connector (102) further comprises a CPA member (120) movable in a frontward direction. The CPA member (120) comprises a CPA pawl (122) projecting frontward and which, when the connectors (102, 104) are not mated, engages the locking pawl (112) so as to block a frontward movement of the CPA member (120). The CPA member (120) further comprises a coupling detecting system (126), configured, when the connectors (102, 104) are mated, to cooperate with the second locking stop (134) in such a way to clear the CPA pawl (122) from the locking pawl (112) so that in a final position the CPA pawl (122) lies outside a rectangular area.