Brakes – Internal-resistance motion retarder – Electroviscous or electrorheological fluid
Patent
1997-03-05
1999-09-07
Schwartz, Chris
Brakes
Internal-resistance motion retarder
Electroviscous or electrorheological fluid
26714014, F16F 906, F16F 600
Patent
active
059472383
ABSTRACT:
A magnetorheological fluid device which exhibits excursion (stroke or rotation) dependent resistance (force or torque) which is obtained passively. Linear and rotary embodiments are described. The devices described herein include various ways for passively varying magnetic circuit reluctance to accomplish the stroke or rotation dependent characteristic. The devices include a first component with an internal cavity, a second component received in the cavity and moveable relative to the first component, a working zone created between the first and second component, a magnetorheological fluid contained therein, at least one permanent magnet for producing a magnetic field, a magnetic circuit for directing a magnetic flux created by the permanent magnet toward the magnetorheological fluid in the working zone, and passively varying a magnetic circuit reluctance (such as by changing a thickness of a magnetic return, by changing a gap thickness, by changing the material reluctance, by interacting multiple magnetic fields, or combinations thereof) as a function of excursion. This changes the magnetic field strength acting upon the MR fluid in the working zone and produces a force/torque which varies as a function of excursion (x or .theta.).
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Chrzan Michael J.
Jolly Mark R.
Lord Corporation
Schwartz Chris
Wayland Randall S.
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