Connector Housing Drainage Pathways Prevent Sink Marks
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Solution Overview
Problem
The existing connector design is prone to sink marks during molding due to excessive wall thickness in the posture stabilization region and suffers from moisture accumulation and potential leakage when the hood part is oriented upward, leading to drainage issues.
Innovation Solution
The connector incorporates a mold drawing pathway and drainage pathways that extend in the front and back direction, reducing the wall thickness in the posture stabilization region and allowing for efficient moisture discharge, eliminating the need for a slide mold and enhancing drainage by connecting these pathways in a straight line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a guide recessed part is formed by cutting out the outer surface of the terminal holding part and the inner surface of the outer wall part, then the terminal fitting can be smoothly inserted into the terminal accommodating chamber, but the wall thickness in the posture stabilization part becomes too thick and sink marks occur
Solution Approach 1:
The guide recessed part is divided into two segments: one formed on the inner surface of the outer wall part and another on the inner surface of the posture stabilization part. This segmentation allows the guide function to be achieved without requiring excessive material removal that would cause non-uniform wall thickness and sink marks.
Solution Approach 2:
The guide recessed part is localized to specific regions (inner surface of outer wall part and inner surface of posture stabilization part) rather than being formed by cutting through the entire thickness. This local quality approach maintains adequate wall thickness in critical areas while still providing the necessary guidance function for terminal fitting insertion.
2Strength
If the hood part is molded integrally with the terminal holding part, then the connector structure is simplified and strength is improved, but moisture and dew condensation water accumulate in the hood part when oriented upward, causing leakage
Solution Approach 1:
Drainage pathways are extracted from the integral housing structure to create dedicated channels for moisture removal. These pathways include a first drainage pathway on the inner surface of the hood part and a second drainage pathway on the outer surface, connected through a communication hole in the bottom wall, allowing moisture to be extracted and discharged from the hood part.
Solution Approach 2:
The integral housing structure serves multiple functions: it provides structural strength and rigidity while simultaneously incorporating drainage functionality through the integrated drainage pathways. The communication hole in the bottom wall enables both structural integrity and moisture discharge capability within the same molded part.
3Manufacturing precision
If the wall thickness in the posture stabilization part is reduced to prevent sink marks, then manufacturing precision is improved, but the structural strength and stability of the terminal holding part may be compromised
Solution Approach 1:
The guide recessed part is localized to specific regions with controlled depth, ensuring that wall thickness is reduced only where necessary for guidance function while maintaining adequate thickness in load-bearing areas. The first and second guide recessed parts are positioned to provide guidance without compromising the overall structural integrity of the terminal holding part.
Solution Approach 2:
The guide recessed part is segmented into multiple regions with different depth characteristics, allowing optimized wall thickness distribution. This segmentation enables the structure to maintain strength in critical areas while providing sufficient guidance function in other areas, preventing sink marks without sacrificing structural integrity.
Data Source
AI summary
The invention achieves prevention of sink mark and drainage within a hood part. A housing (10) made of synthetic resin has a hood part (17) extending forward from a terminal holding part (11), and a guide wall part (19) having a guide recessed part (15) formed in a back end part of an inner surface. The housing (10) is formed with a longitudinal mold drawing pathway (20) which includes a mold drawing recessed part (21) having a form which recesses a region in front of a region corresponding to the guide recessed part (15) of the outer surface of the guide wall part (19), and a mold drawing port (22) having a form that communicates with the mold drawing recessed part (21) and passes through a back surface wall (18).