Magnetorheological fluids

摘要

One embodiment of the invention includes an MR fluid of improved durability. The MR fluid is particularly useful in devices that , subject the fluid to substantial centrifugal forces, such as large fan clutches. A particular embodiment includes a magnetorheological fluid including 10 to 14 wt% of a hydrocarbon-based liquid, 86 to 90 wt% of bimodal magnetizable particles, and 0.05 to 0.5 wt% fumed silica.