Magnetorheological Fluid Composition for Durable MR Braking Torque

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Solution Overview

Problem

Magneto rheological fluids used in devices like MR brakes face durability issues when repeatedly exposed to magnetic fields, leading to performance deterioration over time.

Innovation Solution

A magneto rheological fluid composition comprising magnetic particles, a silicone-based or mixed carrier fluid, zinc dialkyldithiophosphate as an organic zinc compound, melamine (iso)cyanurate, and additional components like polyester compounds and copper carboxylates, which enhance durability by preventing decomposition and improving rheological properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a magneto rheological fluid is repeatedly exposed to magnetic fields, then the fluid can perform braking operations, but the fluid deteriorates and loses performance over time

Engineering Contradiction:

Improvebraking performance stabilityVSAvoidfluid durability

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent applies preliminary action by adding organic zinc compound and melamine (iso)cyanurate to the magneto rheological fluid before use. These additives pre-form protective structures around magnetic particles and prevent decomposition reactions from occurring during repeated magnetic field exposure, thereby maintaining fluid performance over extended operational periods.

Inventive Principle:

Principle #10Preliminary action

2Force

If magnetic particles form clusters in the fluid, then yielding shear stress increases for effective braking, but the fluid becomes less stable and more prone to decomposition

Engineering Contradiction:

Improveyielding shear stressVSAvoidfluid composition stability

Core Design Contradiction:

ForceVSStability of the object's composition

Solution Approach 1:

The organic zinc compound acts as an intermediary substance between magnetic particles and the carrier fluid. It forms protective complexes around magnetic particles that allow cluster formation for high shear stress while simultaneously preventing direct contact and decomposition reactions, thus maintaining composition stability during repeated use.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Power

If the fluid is designed for high initial performance, then braking torque is effective from the start, but the fluid decomposes faster under repeated magnetic field exposure

Engineering Contradiction:

Improvebraking torqueVSAvoidperformance consistency over time

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

The patent implements beforehand cushioning by incorporating melamine (iso)cyanurate and organic zinc compound that form protective barriers around magnetic particles before decomposition can occur. This pre-protection mechanism cushions against the damaging effects of repeated magnetic field exposure, allowing the fluid to maintain consistent high performance over extended periods.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 enhanced fluid exhibits improved durability and sustained performance even under repeated magnetic field exposure, maintaining effective braking torque and device functionality over a longer period.

Implementation Method 1

A magneto rheological fluid is a fluid that contains magnetic particles and a carrier fluid and has a property of changing the rheology by applying a magnetic field. In a case where a magnetic field is applied, magnetic particles form clusters, which reduces the fluidity of the magneto rheological fluid.

Methodology Applied

Scientific EffectMagnetorheological effect: Magnetorheological Fluid

Implementation Method 2

Methodology Applied

Scientific EffectChemical stabilization:

Data Source

PatentUS20240186044A1Magneto rheological fluid and magneto rheological fluid device

Publication Date: 2024.06.06 FUJIFILM CORP

AI summary

There are provided a magneto rheological fluid containing magnetic particles, a carrier fluid, an organic zinc compound, and melamine (iso)cyanurate, and a magneto rheological fluid device containing this magneto rheological fluid.