Apparatus with active material surface in contact with...

Details Apparatus with active material surface in contact with... Apparatus with active material surface in contact with...

2007-08-03

2011-11-15

Le, David D (Department: 3655)

192 clutches and power-stop control

Field responsive frictional media type

C188S267200

Reexamination Certificate

active

08056687

ABSTRACT:
An apparatus is provided having an active material forming a surface thereof in contact with a rheological fluid. The active material is controllable to vary a surface geometry thereof between a rough or nonsmooth surface geometry to increase drag, and achieve an increase in stress transmitted through the fluid, when a field is applied, while allowing a smooth surface geometry and an associated reduction in stress transmitted through the fluid when the field is removed. A method of enhancing performance of an apparatus that includes a rheological fluid is also provided.

REFERENCES:
patent: 5762584 (1998-06-01), Daniels
patent: 7563334 (2009-07-01), Zhang et al.
patent: 2005/0274454 (2005-12-01), Extrand
patent: 2007/0023247 (2007-02-01), Ulicny et al.
patent: 2007/0278060 (2007-12-01), Kennedy et al.
patent: 1479754 (1989-05-01), None
Shorey et al., Design and Testing of a New Magnetorheometer, Review of Scientific Instruments, vol. 70, No. 11 (Nov. 1999).

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