Model Vehicle Locking Differential via Segmented Slider Mechanism

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Solution Overview

Problem

Existing locking differentials for model vehicles are complex and difficult to assemble, making them expensive and inefficient for switching between open and locked modes, which is necessary for maneuvering on various terrains.

Innovation Solution

A model vehicle locking differential with a differential gear carrier and a locking device that can be easily actuated between engaged and disengaged positions, allowing for seamless switching between open and locked modes, comprising a slider and actuator mechanism to control the differential action between driven wheels.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a locking differential is incorporated to prevent wheel spin on variable terrain, then all-terrain capability is improved, but device complexity increases and assembly becomes difficult

Engineering Contradiction:

Improveall-terrain capabilityVSAvoiddifferential complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The locking differential mechanism is divided into separate modular components: a differential carrier assembly and a locking mechanism assembly. The locking mechanism includes a locking member with engagement features that can independently engage with the differential carrier. This segmentation allows each component to be manufactured and assembled separately, reducing overall assembly difficulty while maintaining the locking functionality for all-terrain capability.

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If a locking differential is incorporated to prevent wheel spin on variable terrain, then all-terrain capability is improved, but manufacturing cost increases

Engineering Contradiction:

Improveall-terrain capabilityVSAvoidmanufacturing cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

By segmenting the locking differential into separate assemblies (differential carrier and locking mechanism), each component can be manufactured using standardized processes and then assembled. This reduces tooling costs and allows for more efficient production, lowering manufacturing costs while maintaining the all-terrain capability through the locking functionality.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The locking mechanism uses simple, easily manufactured components such as the locking member with engagement features that can be produced cost-effectively. The design prioritizes functional simplicity over complex durable materials, allowing for cost-effective production while achieving the required all-terrain performance.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Adaptability or versatility

If a locking differential is incorporated to prevent wheel spin on variable terrain, then all-terrain capability is improved, but assembly difficulty increases

Engineering Contradiction:

Improveall-terrain capabilityVSAvoidassembly difficulty

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The differential is provided as a separate assembly with pre-configured locking mechanisms. This segmentation allows the locking differential to be installed as a modular unit rather than assembling complex internal components, significantly reducing assembly difficulty while maintaining the all-terrain capability through the integrated locking functionality.

Inventive Principle:

Principle #1Segmentation

4Ease of operation

If an open differential is used to allow different wheel rotation rates during turns, then maneuverability is improved, but traction on variable terrain deteriorates

Engineering Contradiction:

ImprovemaneuverabilityVSAvoidtraction on variable terrain

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

The locking mechanism is designed to dynamically switch between engaged and disengaged states based on terrain conditions. During normal operation on paved surfaces, the locking member remains disengaged, allowing the open differential to provide maneuverability by permitting different wheel rotation rates. When variable terrain or traction loss is detected, the locking member engages to prevent wheel spin, thus adapting to different operating conditions and providing both maneuverability and traction capability.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS8096913B2Locking differential assembly for a model vehicle

Publication Date: 2012.01.17 TRAXXAS

AI summary

A locking differential assembly for use in a toy model vehicle. This is accomplished by mounting a locking clutch assembly on an output shaft of a differential gear carrier having an external face. The locking clutch assembly includes a slider member that may be configured to move along the output shaft to engage the external face to disable a differential action of the differential gear carrier.