Card Connector Pre-Assembled Ejector Shaft Alignment
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Solution Overview
Problem
Existing card connectors face high manufacturing rejection rates due to the complexity of assembling the ejector shaft within the insulative housing.
Innovation Solution
A card connector design featuring a metallic shell with a receiving slot for the ejector shaft, where the upper and lower walls restrict the shaft's movement in the up-and-down direction, reducing interference and improving assembly precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the ejector shaft is assembled within the insulative housing using conventional methods, then the assembly process becomes complex and time-consuming, but the manufacturing rejection rate increases due to alignment difficulties and assembly interference
Solution Approach 1:
The ejector shaft is pre-assembled with the actuator and positioned in advance within the insulative housing before the metallic shell is attached. This preliminary assembly ensures proper alignment and positioning of the shaft, eliminating alignment difficulties during final assembly and reducing manufacturing rejection rate
Solution Approach 2:
The assembly is divided into separate modules: the insulative housing with pre-assembled ejector shaft and actuator, and the metallic shell. This segmentation allows each component to be manufactured and assembled independently, simplifying the overall assembly process while ensuring proper alignment through dedicated receiving grooves and slots
2Ease of manufacture
If the ejector shaft is allowed free movement during assembly, then assembly is simpler, but alignment precision deteriorates causing manufacturing defects
Solution Approach 1:
The metallic shell has a receiving slot with specific local geometry that matches the ejector shaft dimensions. The upper and lower walls of the slot provide localized constraint only where needed, ensuring precise shaft alignment in the vertical direction while maintaining assembly simplicity through the defined geometric relationship
Data Source
AI summary
A card connector includes an insulative housing defining a front-and-rear direction, a number of contacts accommodated in the insulative housing, a metallic shell enclosing the insulative housing to form a receiving space and an ejector having a shaft received in the right of the receiving space and an actuator driven by the ejector. The metallic shell has a receiving slot receiving the shaft, and an upper wall and a lower wall around the receiving slot. The upper wall and the lower wall restrict the shaft in an up-and-down direction perpendicular to the front-and-rear direction.