Magneto-rheological fluid and clutch using the same
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United States of America Patent
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Aug 23, 2016
Grant Date -
Sep 24, 2015
app pub date -
Oct 8, 2014
filing date -
Mar 20, 2014
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Abstract
A magneto-rheological fluid includes a magnetic particle mixture, and a dispersion medium for dispersing the magnetic particle mixture. The magnetic particle mixture contains the first magnetic particles and the second magnetic particles. The first magnetic particles have an average particle diameter of 1 μm or more and 30 μm or less. The second magnetic particles are particles of a soft magnetic material, and have an average particle diameter of 50 nm or more and 200 nm or less. A ratio of the second magnetic particles in the magnetic particle mixture is 10% by mass or more and 40% by mass or less.
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