Waterproof Electrical Connector Assembly with Segmented Over-Molding
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Solution Overview
Problem
Existing waterproof electrical connectors face challenges in maintaining effective sealing and structural integrity, particularly in ensuring the rear of the connector remains sealed while allowing for inspection and maintaining rigidity during mating/un-mating operations.
Innovation Solution
The design incorporates an insulative housing with a base, front tongue, and rear extension, along with upper and lower rows of contacts, a metallic plate, and a shielding shell that is over-molded with an outer cover to form a sealing potting portion, ensuring the rear of the connector is sealed while exposing the rear extension and contact tails, and includes features like slots, hooks, and notches for secure assembly and inspection access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rear of the connector is sealed to maintain waterproofing, then sealing integrity is improved, but inspection access deteriorates
Solution Approach 1:
The connector is divided into a front portion with contacts and a rear extension portion. The rear extension is exposed without over-molding to allow inspection access, while the front portion is over-molded for waterproof sealing. This segmentation resolves the contradiction by separating the sealed region from the inspection region.
2Reliability
If resin is filled to seal the rear of the connector, then waterproofing is improved, but resin flow control deteriorates
Solution Approach 1:
The mold cavity is segmented into a front sealing region and a rear extension region. The resin filling process is controlled to fill only the front portion up to a predetermined level, leaving the rear extension exposed. This prevents resin overflow while ensuring waterproof sealing of the contact region.
Solution Approach 2:
The insulative housing is designed with a predetermined geometry that guides resin flow during the over-molding process. The housing structure itself prepares the cavity shape to control where resin will flow and stop, preventing overflow before it occurs.
3Productivity
If the connector structure is simplified for assembly, then manufacturing efficiency is improved, but structural stability deteriorates
Solution Approach 1:
The insulative housing and shielding shell are over-molded together in a single integrated structure. This merging of components simplifies assembly by eliminating separate sealing elements and reduces the number of parts, while the integrated structure provides enhanced structural stability and rigidity.
Solution Approach 2:
The connector combines different materials - an insulative housing material and a metallic shielding shell material - into a composite over-molded structure. This composite construction provides both the electrical insulation and shielding functions while enhancing overall structural stability.
4Ease of operation
If the rear extension is exposed for inspection, then inspection access is improved, but waterproof sealing deteriorates
Solution Approach 1:
The connector is segmented into a sealed front portion and an exposed rear extension portion. The over-molding process creates a waterproof seal around the contacts and housing while deliberately leaving the rear extension exposed for inspection. The segmentation clearly defines where sealing ends and inspection access begins.
Data Source
AI summary
An electrical connector assembly includes an electrical connector and an outer cover over-molding the electrical connector. The electrical connector include: an insulative housing having a base, a front tongue, and a rear extension; an upper and lower rows of contacts mounted in the insulative housing and exposed to the tongue, each of the upper and lower rows of contacts having a tail; a metallic plate positioned between the upper and lower rows of contacts; and a shielding shell enclosing the insulative housing. The outer cover is over-molded with the shielding shell to seal a rear of the electrical connector while exposing the rear extension of the insulative housing and the tails of the contacts.