Eddy Current Differential Limiting Mechanism

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Solution Overview

Problem

Existing vehicle differentials face challenges in efficiently distributing power to both driving wheels on rough roads, leading to reduced performance and increased complexity, cost, and decreased durability, negatively impacting fuel efficiency and marketability.

Innovation Solution

A differential design incorporating a metal plate interlocking with a pinion and a U-shaped permanent magnet fixed to the differential case, generating an eddy current to limit rotation speed and enhance power distribution, thereby simplifying configuration and reducing weight.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a mechanical differential limiting mechanism is used, then power distribution is improved, but device complexity increases

Engineering Contradiction:

Improvepower distributionVSAvoidconfiguration

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces the traditional mechanical differential limiting mechanism with an electromagnetic system consisting of permanent magnets and an eddy current brake. The permanent magnets generate a magnetic field that induces eddy currents in the brake, creating electromagnetic resistance to control pinion rotation speed. This substitution eliminates complex mechanical linkages, levers, and springs while achieving the same power distribution function through electromagnetic fields.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If a mechanical differential limiting mechanism is used, then power distribution is improved, but weight increases

Engineering Contradiction:

Improvepower distributionVSAvoidweight

Core Design Contradiction:

ReliabilityVSWeight of moving object

Solution Approach 1:

The electromagnetic differential limiting mechanism replaces heavy mechanical components with lighter electromagnetic elements. The permanent magnets and eddy current brake generate the necessary limiting force through electromagnetic fields rather than mechanical force transmission, significantly reducing the overall weight of the differential assembly while maintaining effective power distribution control.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If a mechanical differential limiting mechanism is used, then power distribution is improved, but manufacturing cost increases

Engineering Contradiction:

Improvepower distributionVSAvoidcost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent simplifies manufacturing by replacing precision-machined mechanical components with standard permanent magnets and an eddy current brake assembly. The electromagnetic approach requires fewer precision-machined parts, less complex assembly procedures, and allows for more straightforward quality control, thereby reducing manufacturing costs while achieving reliable power distribution.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Reliability

If a mechanical differential limiting mechanism is used, then power distribution is improved, but durability decreases

Engineering Contradiction:

Improvepower distributionVSAvoiddurability

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The electromagnetic differential limiting mechanism eliminates mechanical wear by replacing contact-based mechanical linkages with non-contact electromagnetic field interactions. The permanent magnets and eddy current brake operate without physical contact, eliminating friction, wear, and the need for lubrication, thereby significantly extending the service life and durability of the differential assembly.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

This design improves power distribution, enhances durability, and reduces costs and weight, resulting in improved fuel efficiency and marketability by providing a simpler and more effective differential limiting function.

Implementation Method 1

at least one permanent magnet fixable to a case of the differential to generate an eddy current in the metal plate upon a relative rotation of the metal plate

Methodology Applied

Scientific EffectEddy current: Eddy Currents

Data Source

PatentUS10107373B2Differential

Publication Date: 2018.10.23 HYUNDAI MOTOR CO LTD

AI summary

A differential may include a metal plate interlocking with a pinion, and at least one permanent magnet fixable to a case of the differential to generate an eddy current in the metal plate upon a relative rotation of the metal plate.