Method and apparatus for increasing and modulating the yield...

B - Operations – Transporting – 01 – J

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B01J 19/08 (2006.01) B24B 1/00 (2006.01) C10M 171/00 (2006.01) F15B 21/06 (2006.01) F16F 9/53 (2006.01)

Patent

CA 2466018

A method for increasing and/or modulating the yield shear stress of an electrorheological fluid (10) includes applying a sufficient electric field to the fluid (10) to cause the formation of chains of particles, and then applying a sufficient pressure to the fluid (10) to cause thickening or aggregation of the chains. An apparatus (20) for increasing and/or modulating the transfer of force or torque between two working structures (18, 22) includes an electrorheological fluid (10) and electrodes (25, 27) through which an electric field is applied to the fluid (10) such that chains of particles are formed in the fluid (10) and, upon application of pressure to the fluid (10), the chains thicken or aggregate and improve the force or torque transmission.

La présente invention concerne un procédé servant à accroître et/ou à moduler la déformation en cisaillement d'un fluide électrorhéologique et consistant à appliquer un champ électrique suffisant au fluide pour entraîner la formation de chaînes de particules, puis à exercer une pression suffisante sur le fluide pour provoquer l'épaississement ou l'agrégation des chaînes. Cette invention concerne également un appareil servant à accroître et/ou à moduler le transfert de la force ou du couple entre deux structures de travail, lequel appareil comprend un fluide électrorhéologique et des électrodes par lesquelles un champ électrique est appliqué au fluide de sorte que les chaînes de particules soient formées dans le fluide et, sous l'effet de la pression sur le fluide, que les chaînes s'épaississent ou s'agrègent et que le transfert de force ou de couple soit ainsi amélioré.

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