Connector Housing With Fixed Lance And Asymmetric Arms
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Solution Overview
Problem
The miniaturization of connectors has made it difficult to maintain a high lance locking force while maintaining a narrow pitch, as the thin-walled metallic mold cannot withstand resin injection pressure, and the shape becomes impossible to mold by injection molding.
Innovation Solution
A connector housing design featuring a lance with a pair of arms extending from both lateral sides, where one arm has a stronger reaction force due to a differing unlocking protrusion, allowing for increased locking force and reduced pitch without the need for projections on both sides, and a removal jig with a simple shape for efficient terminal removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If projections are provided on both right and left sides of the lance for unlocking, then the terminal locking force is maintained high, but the pitch between cavities increases and miniaturization is compromised
Solution Approach 1:
The invention extracts the unlocking function from both sides of the lance and concentrates it on only one side. By removing the unnecessary projection from one side, the pitch between cavities is reduced while the terminal locking force is maintained through the optimized single-sided projection design with asymmetric arm configuration.
Solution Approach 2:
The invention introduces asymmetry in the arm configuration where one arm has a different length than the other arm. This asymmetric design allows the projection to be positioned optimally on one side only, creating sufficient locking force while minimizing the horizontal space required, thus reducing the pitch between cavities.
2Length of moving object
If the mold walls are made thin to achieve narrow pitch, then miniaturization is improved, but the metallic mold cannot withstand resin injection pressure
Solution Approach 1:
The invention transitions from a symmetric two-sided projection design to an asymmetric one-sided projection design. This dimensional change in the configuration approach allows the mold walls to be thinner while maintaining structural integrity during injection molding, as the asymmetric design distributes stresses more effectively and requires less material for mold support.
3Force
If projections are provided on both sides of the lance, then the terminal locking force is improved, but the device complexity increases
Solution Approach 1:
The invention removes the redundant projection from one side of the lance, extracting only the essential unlocking function from the dual-sided design. This simplification reduces the number of components and structural elements required, thereby decreasing device complexity while maintaining adequate terminal locking force through the optimized asymmetric configuration.
Data Source
AI summary
A connector housing includes a terminal accommodating chamber, a lance and a pair of arms. The terminal accommodating chamber is formed with an opening configured such that a terminal is inserted therethrough. The lance extends from a top wall of the terminal accommodating chamber toward the opening in an extending direction. The pair of arms are respectively formed integrally to both lateral side surfaces of the lance, extend from both the lateral side surfaces to front and back sides of the lance in the extending direction, and are connected to a bottom wall of the terminal accommodating chamber. An unlocking protrusion is formed in one of the arms.