Connector Assembly Pre-Stage Locking for High Blocking Force

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Solution Overview

Problem

Conventional male terminal stabilizers in unsealed electrical connectors have low blocking forces, making them prone to premature release during shipping and handling, and complex designs increase manufacturing costs.

Innovation Solution

The electrical connector assembly features a flexible pre-stage locking arm with angled rib features and a male terminal stabilizer with a flexible retention arm and retraction arm, providing a higher blocking force and secure positioning through engagement and disengagement mechanisms between connector bodies.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional pre-stage locks are used with low blocking force (30-40 newtons), then the mating female connector can easily push the male terminal stabilizer from pre-staged to full staged position, but the stabilizer may be prematurely released by unknown objects during shipping and handling

Engineering Contradiction:
Improvestabilizer positioning reliabilityVSAvoidblocking force
Core Design Contradiction:
ReliabilityVSForce

Solution Approach 1:

The patent changes the blocking force parameter from 30-40 newtons in conventional designs to greater than 100 newtons in the improved design. This is achieved by modifying the pre-stage lock geometry and material properties to provide sufficient blocking force to prevent premature release during shipping and handling, while still allowing controlled disengagement during mating through the camming action of the angled rib features.

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The patent employs a dynamic locking mechanism where the pre-stage locking arm can transition between locked and unlocked states. The angled rib features create a camming action that allows the lock to disengage controllably during mating while maintaining a secure locked state during shipping. The flexible retention arm also provides dynamic engagement/disengagement based on applied forces.

Inventive Principle:
Principle #15Dynamics

2Reliability

If complex features and geometric shapes are added to provide greater blocking force, then premature release is prevented, but tooling costs for manufacturing increase

Engineering Contradiction:
Improvestabilizer positioning reliabilityVSAvoidmanufacturing cost
Core Design Contradiction:
ReliabilityVSEase of manufacture

Solution Approach 1:

The patent divides the locking function into separate modular components: the pre-stage locking arm with angled rib features, the pre-stage stop tab on the stabilizer, and the flexible retention arm with hook feature. This segmentation allows each component to be manufactured using standard tooling and assembly processes, avoiding the need for complex monolithic features while achieving the required blocking force through the interaction of simpler geometric elements.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent achieves greater blocking force (greater than 100 newtons) by optimizing parameters of simple geometric features rather than adding complex shapes. The angled rib features are designed with specific angles and dimensions that create mechanical advantage through camming action, allowing standard manufacturing processes to produce the required force without increasing tooling costs.

Inventive Principle:
Principle #35Parameter changes

3Reliability

If the pre-stage locking arm provides high blocking force, then premature release is prevented, but the stabilizer cannot be easily pushed to full staged position during mating

Engineering Contradiction:
Improvestabilizer positioning reliabilityVSAvoidstabilizer transition ease
Core Design Contradiction:
ReliabilityVSEase of operation

Solution Approach 1:

The patent creates a dynamic locking system where the pre-stage locking arm remains rigid and locked during shipping but can transition to an unlocked state during mating. The angled rib features act as camming surfaces that, when engaged by the mating connector, create a leveraged disengagement motion that overcomes the high blocking force and allows the stabilizer to move smoothly from pre-staged to full staged position.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The patent designs the angled rib features to provide preliminary anti-action by creating a camming mechanism that resists premature disengagement during shipping while being pre-configured to allow controlled disengagement during mating. The geometry of the angled ribs is designed so that normal handling forces cannot overcome the blocking force, but the mating connector's engagement with the ribs creates the necessary mechanical advantage for controlled transition.

Inventive Principle:
Principle #9Preliminary anti-action

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution ensures the male terminal stabilizer maintains a blocking force exceeding 100 newtons, preventing premature release and reducing manufacturing costs by simplifying the design.

Implementation Method 1

a flexible pre-stage locking arm defining a pre-stage stop face

Methodology Applied
Scientific EffectElasticity: Elasticity

Implementation Method 2

the pair of angled rib features and bend them outwardly to disengage the pre-stage stop faces of the pre-stage locking arms from the pre-stage stop tab

Methodology Applied
Scientific EffectElastic deformation: Deformation

Implementation Method 3

a flexible retention arm having a hook feature on its distal end that engages a retention stop face defined by the first electrical connector body

Methodology Applied
Scientific EffectElasticity: Elasticity

Implementation Method 4

a flexible retraction arm having a hook feature on its distal end that engages a retraction face defined by the second connector body when the first connector body is unmated from the second connector body, thereby pulling the male terminal stabilizer from the full staged position to the pre-staged position

Methodology Applied
Scientific EffectElasticity: Elasticity

Data Source

PatentEP4016755B1Electrical connector assembly
Publication Date: 2024.05.29 APTIV TECHNOLOGIES LTD
  • EP4016755B1 patent drawingFigure 1~2
  • EP4016755B1 patent drawingFigure 3~4
  • EP4016755B1 patent drawingFigure 5~6

AI summary

An electrical connector assembly (100) includes a first connector body (106), a male terminal stabilizer (102) disposed within the first connector body (106) that is moveable from a pre-staged position (118) to a full staged position (120), a second connector body (138), means for retaining the male terminal stabilizer (102) in the pre-staged position (118) until the second connector body (138) is inserted within the first connector body (106), means for releasing the male terminal stabilizer (102) from the pre-stage position and allow the second connector body (138) to push the male terminal stabilizer (102) to the full staged position (120), means for returning the male terminal stabilizer (102) from the full staged position (120) to the pre-staged when the second connector body (138) is withdrawn from the first connector body (106), and means for retaining the male terminal stabilizer (102) in the first connector body (106) as the second connector body (138) is withdrawn from the first connector body (106).