Magnetorheological Fluid Composition for Stable Torque Transmission
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Solution Overview
Problem
Rotational magneto rheological fluid devices face degradation due to the smaller amount of MR fluid contributing to torque transmission, leading to reduced durability and efficiency.
Innovation Solution
A magneto rheological fluid device with a magnetic field generator crossing the MR fluid layer and using fluorine oil as a dispersion medium, which enhances the stability and effectiveness of the MR fluid in torque transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the proportion of MR fluid contributing to torque transmission is increased in a compact rotational device, then torque transmission efficiency is improved, but MR fluid degradation accelerates
Solution Approach 1:
The patent changes the chemical composition parameter of the dispersion medium from conventional oils (mineral oil, vegetable oil, synthetic oil) to fluorine oil. This parameter change allows the MR fluid to maintain stability even when a high proportion of the fluid is engaged in torque transmission, thereby resolving the contradiction between torque transmission efficiency and fluid stability
Solution Approach 2:
The patent creates a composite MR fluid system by combining magnetic particles with fluorine oil as the dispersion medium. This composite material approach provides superior chemical stability and resistance to degradation compared to conventional oil-based MR fluids, enabling sustained high-performance torque transmission without accelerated degradation
2Volume of moving object
If the total amount of MR fluid in the device is reduced to make the device compact, then device size is decreased, but the proportion of MR fluid not contributing to torque transmission is reduced, leading to increased degradation
Solution Approach 1:
By changing the dispersion medium to fluorine oil, the patent fundamentally alters the degradation characteristics of the MR fluid. This parameter change enables the system to tolerate higher proportions of actively engaged fluid without suffering from accelerated degradation, thus allowing compact design with reduced total fluid volume while maintaining reliability
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 use of fluorine oil as a dispersion medium significantly reduces MR fluid degradation, allowing the device to operate stably for a longer period with improved torque transmission efficiency.
Implementation Method 1
Under application of a magnetic field from the outside to the MR fluid, the magnetic particles form a large number of clusters along a direction of the magnetic field, and the yield stress increases
Implementation Method 2
a magnetic field generator, the magnetic field generator forms a magnetic path so as to cross the layer of the magneto rheological fluid interposed between the first member and the second member in a thickness direction
Data Source
AI summary
A magneto rheological fluid device includes a first member 101 and a second member 102 that rotate relative to each other with a layer of a magneto rheological fluid 200 having a predetermined thickness interposed therebetween, and a magnetic field generator 128. The magnetic field generator 128 forms a magnetic path so as to cross the layer of the magneto rheological fluid 200 interposed between the first member 101 and the second member 102 in a thickness direction. The magneto rheological fluid 200 contains fluorine oil as a dispersion medium.