Patent ID: 6896109
Filing Date: 2005-05-24
Classification: F16F

Abstract:
1. A magnetorheological fluid device comprising: a piston, a fluid chamber, and at least one electromagnetic coil, wherein the piston is further comprised of a toroidal displacement body and the fluid chamber is of toroidal shape and encompasses the toroidal displacement body such that an upper volume is created above the toroidal displacement body and a lower volume is created below the toroidal displacement body, wherein a first fluid gap is effected between the upper and lower volumes and between an outer radius surface of the toroidal displacement body and an outer radius wall of the fluid chamber, and a second fluid gap is effected between the upper volume and a third volume and between an inner radius surface of the toroidal displacement body and an inner radius wall of the fluid chamber, and a third fluid gap is effected between the lower volume and the third volume and between the inner radius surface of the toroidal displacement body and the inner radius wall of the fluid chamber, wherein the upper and lower volumes comprise no elastomeric elements and no flexures so to effect opposing volumes capable of very high pressure, wherein the third volume is dynamic pressure isolated from the upper volume and lower volume by the second and third fluid gaps, and wherein the at least one electromagnetic coil is mounted in proximity to the fluid chamber and effects a magnetic field on the three fluid gaps between the toroidal displacement body and the fluid chamber.