Bi-fold valve-type magnetorheological fluid energy absorbing...

Details Bi-fold valve-type magnetorheological fluid energy absorbing... Bi-fold valve-type magnetorheological fluid energy absorbing...

2011-03-08

2011-03-08

Schwartz, Christopher P (Department: 3657)

Brakes

Internal-resistance motion retarder

Magnetic fluid or material

Reexamination Certificate

active

07900755

ABSTRACT:
An energy absorbing device is provided that includes a damper assembly having inner and outer concentric tubes and a piston movable within the inner tube. The damper assembly is configured to form bi-fold valve-type cavities to operatively connect an inner chamber of the inner tube with an outer chamber formed between the inner and outer tubes. A magnetorheological fluid fills the chambers and the bi-fold valve-type cavities. The magnetorheological fluid preferably contains coated magnetic particles at about 10 to 60 percent by volume. Electrical coils adjacent the bi-fold valves are selectively energizable to such that the energy absorbing device provides a tunable damping force, preferably over the entire range of velocities of the piston, especially in automotive applications.

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