Patent ID: 8205728
Filing Date: 2012-06-26
Classification: F16F

Abstract:
1. Magnetorheological force transmission device, comprising: two solid body parts operable to be moved in a substantially translational manner against each other, and an MRF gap, which is at least partially filled with a magnetorheological material ( a magnetic circuit system operating to generate a magnetic flux within at least part of the MRF gap, the magnetic circuit system including: (i) at least one electromagnet each having at least one coil, (ii) at least one permanent magnet, and (iii) at least one of a magnetic-field-balancing insert and a magnetic isolator, wherein the at least one electromagnet is operable to produce a varying portion of the magnetic flux, and the at least one permanent magnet is operable to produce a fixed portion of the magnetic flux, wherein the magnetic flux exhibits a magnetic base field within the at least part of the MRF gap and acting upon the magnetorheological material ( the varying portion of the magnetic flux is variable and additive to the magnetic base field when a varying current is flowing through the coil in a first direction, and is variable and subtractive to the magnetic base field when a variable current is flowing through the coil in a second, opposite direction.