Connector Hood Interference Geometry for Wrong Insertion Loads
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Solution Overview
Problem
Existing connectors are prone to damage due to excessive stress on the hood portion when forcibly inserted in a wrong position, compromising the reliability of the erroneous fitting prevention function.
Innovation Solution
The connector design includes a guide projection and a guide groove that allow fitting only in the correct position, with an interference portion and inclined surfaces that distribute the pressing force to prevent damage by dispersing it across multiple directions when a wrong insertion occurs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a recess is formed in the opening of the insertion hole and an inwardly inclined surface is formed in the fitting and locking portion to prevent erroneous insertion, then the erroneous fitting prevention function is improved, but excessive stress is applied to the coupling part between the outer wall and adjacent outer wall, potentially damaging the insertion hole
Solution Approach 1:
The interference portion is divided into two separate contact surfaces: a first contact surface on the guide projection and a second contact surface on the hood portion. This segmentation distributes the pressing force across two distinct locations rather than concentrating it at a single coupling part, thereby preventing damage while maintaining erroneous fitting prevention functionality.
Solution Approach 2:
The first contact surface and second contact surface are designed with specific local geometries and positions to optimize force distribution. The first contact surface is positioned on the guide projection while the second contact surface is positioned on the hood portion, creating localized contact zones that strategically distribute stress away from vulnerable coupling parts.
2Reliability
If the guide projection and guide groove are designed to permit fitting only in proper insertion positions, then the erroneous fitting prevention function is improved, but the structure becomes more complex
Solution Approach 1:
The guide projection and guide groove are designed with asymmetric geometries that allow fitting only in the proper insertion position. The interference portion features asymmetric contact surfaces positioned at specific locations, creating a directional fitting mechanism that prevents erroneous insertion while maintaining structural simplicity through natural asymmetric forms rather than complex additional components.
Data Source
AI summary
An erroneous fitting prevention connector includes: a connector housing having a guide projection; and a mating connector housing having a rectangular tubular hood portion and a guide groove provided to be recessed on an inner wall surface of one side wall of the hood portion and extending along a fitting direction. At a front end portion of the other side wall parallel to the one side wall of the hood portion, an interference portion against which a housing front side end surface of the guide projection abuts when the connector housing is in a wrong insertion position, is formed. The interference portion has a contacted recess portion and an inclined contacted surface. The housing front side end surface has a contact surface that comes into contact with a bottom surface of the contacted recess portion, and an inclined contact surface that comes into contact with the inclined contacted surface.