Shield Connector Shell With Inclined Fixing Part

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Solution Overview

Problem

Existing shield connector designs face issues where the shield member can be removed from the mounting portion when pulled in the separation direction due to insufficient holding force, particularly when the crimp connection is weak.

Innovation Solution

A shield shell with a housing accommodation portion and a shield member mounting portion, featuring an inclined shield member fixing part on its outer surface that expands outward from the base end to the open end, ensuring the binding member is securely fastened and maintains the shield member's position even when pulled.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a ring crimp member is used to connect the terminal of the cylindrical braid to the cylindrical connection portion, then electrical connection is achieved, but the holding force decreases when the shield member is pulled in the separation direction

Engineering Contradiction:
Improveholding forceVSAvoidresistance to separation force
Core Design Contradiction:
ReliabilityVSStrength

Solution Approach 1:

The shield member fixing part is formed with an inclined surface that creates a tapered or conical geometry. This curved/angled shape allows the fixing part to engage the binding member at an angle, converting the pulling force in the separation direction into both axial and radial components. The radial component presses the binding member against the inclined surface, increasing friction and mechanical interlocking, thereby enhancing resistance to separation while maintaining electrical connection functionality.

Inventive Principle:
Principle #14Spheroidality (Curvature)

2Ease of operation

If the shield member mounting portion is designed for simple insertion, then ease of assembly is improved, but the shield member can be easily removed when pulled

Engineering Contradiction:
Improveease of assemblyVSAvoidretention reliability
Core Design Contradiction:
Ease of operationVSReliability

Solution Approach 1:

The shield member mounting portion is divided into distinct functional zones: an insertion region that allows easy insertion, and a fixing region with the inclined shield member fixing part that provides secure retention. The binding member acts as a separate element that bridges these zones, enabling simple insertion followed by automatic mechanical locking through the inclined surface engagement, thus separating the assembly and retention functions.

Inventive Principle:
Principle #1Segmentation

3Ease of manufacture

If the cross-section of the shield member mounting portion is uniform along the axial direction, then manufacturing is simplified, but the binding member cannot be securely fastened against separation forces

Engineering Contradiction:
Improvemanufacturing simplicityVSAvoidfastening force
Core Design Contradiction:
Ease of manufactureVSForce

Solution Approach 1:

The shield member mounting portion features a localized inclined shield member fixing part rather than a uniform structure throughout. This inclined surface is positioned only where needed to engage the binding member, creating a local structural variation that provides enhanced fastening force. The rest of the mounting portion maintains a simpler geometry for ease of manufacture, thus applying the principle of local quality to achieve both manufacturing efficiency and mechanical strength.

Inventive Principle:
Principle #3Local quality

Data Source

PatentUS10431938B2Shield shell and shield connector
Publication Date: 2019.10.01 YAZAKI CORP
  • US10431938B2 patent drawing
  • US10431938B2 patent drawing
  • US10431938B2 patent drawing

AI summary

A shield shell includes a housing accommodation portion and a shield member mounting portion. The shield member mounting portion is formed to be continuous to the housing accommodation portion. A shield member fixing part is provided on an outer surface of the shield member mounting portion. The shield member fixing part has an inclined shape in which a cross-section taken along an axial direction of the shield member mounting portion expands outwards from a base end side of the shield member mounting portion toward an open end side of the shield member mounting portion.