Magnetic Viscous Fluid Composition for Drag Force Aging Stability
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Solution Overview
Problem
Existing magnetic viscous fluids exhibit unsatisfactory drag force during excitation and poor aging stability of drag force, limiting their effectiveness in mechanical devices such as brakes and dampers.
Innovation Solution
A magnetic viscous fluid comprising magnetic particles, ester base synthetic oil, ether base synthetic oil, alkylnaphthalene, inorganic cation exchanger with a siloxane bond, and silicone oil, which enhances particle dispersion and clustering under magnetic fields, maintaining high drag force and stability over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional magnetic viscous fluid composition is used, then the fluid can function as a magnetic viscous fluid, but the drag force during excitation is small and unsatisfactory
Solution Approach 1:
The patent changes the chemical composition parameters of the base oil from conventional options to specifically ester base synthetic oil, ether base synthetic oil, or alkylnaphthalene with controlled carbon numbers, along with specifying precise content ratios (base oil 70-95 mass%, magnetic particles 5-30 mass%). These parameter changes optimize both the drag force during excitation and the aging stability, resolving the contradiction between achieving high force and maintaining reliability over time.
Solution Approach 2:
The patent creates a composite magnetic viscous fluid system combining specifically selected base oil components (ester base synthetic oil, ether base synthetic oil, or alkylnaphthalene) with magnetic particles in controlled proportions. This composite approach enhances both the drag force during excitation and the aging stability, simultaneously addressing both requirements that were previously contradictory.
2Reliability
If magnetic particles are dispersed in conventional base oil, then the fluid can be formulated, but the aging stability of drag force is poor
Solution Approach 1:
The patent modifies the base oil parameters by selecting from ester base synthetic oil, ether base synthetic oil, or alkylnaphthalene with specific carbon number ranges (10-20 for alkyl group). These parameter changes ensure the base oil provides both excellent aging stability and maintains high drag force during excitation, resolving the contradiction between reliability and force.
3Force
If magnetic particles form clusters under magnetic field, then drag force increases, but the fluid may become too thick and lose fluidity
Solution Approach 1:
The patent adjusts the base oil composition parameters (using ester base synthetic oil, ether base synthetic oil, or alkylnaphthalene with specific properties) and controls the magnetic particle content at 5-30 mass%. These parameter changes allow magnetic particles to form clusters under magnetic field for high drag force while the base oil properties maintain sufficient fluidity for operational ease, resolving the contradiction between force and ease of operation.
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 results in a magnetic viscous fluid with excellent drag force during excitation and improved aging stability, ensuring consistent performance in mechanical devices.
Implementation Method 1
When a magnetic field is applied to the magnetic viscous fluid, the magnetic particles form numerous clusters and thicken, causing an internal stress to increase.
Implementation Method 2
a magnetic particle... when a magnetic field is applied to the magnetic viscous fluid, the magnetic particles form numerous clusters
Data Source
AI summary
The present invention provides a magnetic viscous fluid comprising a magnetic particle, at least one selected from ester base synthetic oil, ether base synthetic oil, and alkylnaphthalene having an alkyl group with 10 to 20 carbons, an inorganic cation exchanger with a siloxane bond, and silicone oil.