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United States of America Patent
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Apr 25, 2006
Grant Date -
Jun 10, 2004
app pub date -
Dec 5, 2003
filing date -
Dec 7, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A system is provided that operates on the magnetorheological principle as a detent or wiper element and/or for electrical detection of direction of rotation. The system includes a gear pump, a rotary knob, and at least one gear. The gears is mechanically driven by the rotation of the rotary knob. A magnetorheological fluid is moved and/or pumped within a channel or ring. The viscosity of the fluid is changed by a pulsed magnetic field at a first coil that is provided on the channel, and thereby a change in the torque or the detent is produced. A second coil that is provided on the channel senses a direction of rotation of the rotary knob.
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