Magnetorheological fluid devices and process of controlling...

F - Mech Eng,Light,Heat,Weapons – 16 – F

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F16F 9/53 (2006.01) A63B 21/005 (2006.01) F15B 21/06 (2006.01) F16D 63/00 (2006.01) F16F 13/30 (2006.01) A63B 21/008 (2006.01)

Patent

CA 2199496

The invention relates to magnetorheological (MR) fluid devices (20) and the process of controlling the force in exercise equipment by utilizing the MR fluid devices. The MR fluid devices include rotary and linear acting varieties and are useful for controlled forces in exercise bicycles, recumbent exercisers, ski machines, rowing machines, and stair stepper machines. The rotary MR fluid device is comprised of a rotor (26) supported by bearings (44) and received within a housing (22). An MR fluid is received adjacent the rotor (26) and within a cavity (28) in the housing (22) and the MR fluid is controlled by an applied magnetic field to vary the operating torque resistance. Spring biasing (43) the rotor (26) allows for relaxed tolerances. Optimization of the Ri/Ro ratio is described which reduces the size and weight of the device (20). The linear acting version utilizes simple extensible pumps and an external MR fluid valve to provide a modularized system.

L'invention concerne des dispositifs à fluide magnétorhéologique (MR) (20) et un procédé pour ajuster la résistance d'un exerciseur utilisant ces dispositifs à fluide MR. Les dispositifs à fluide MR sont des dispositifs rotatifs ou linéaires et ils sont utiles pour ajuster la résistance de bicyclettes d'appartement, d'appareils pour effectuer des exercices en position couchée, d'appareils d'entraînement au ski, d'appareils pour s'entraîner à ramer et d'appareils permettant de simuler la montée d'un escalier. L'appareil rotatif à fluide MR est constitué d'un rotor (26) porté par des paliers (44) et placé dans un logement (22). Le fluide MR se trouve dans une cavité (28) jouxtant le rotor (26) et on lui applique un champ magnétique pour modifier la résistance au couple de rotation. L'utilisation de ressorts (43) permet d'augmenter les tolérances des composantes. On décrit une optimisation du rapport Ri/Ro qui permet de diminuer la taille et le poids du dispositif (20). La version linéaire utilise des pompes extensibles simples et une vanne à fluide MR externe pour constituer un système modulaire.

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