Torsional magnetorheological device

• US 7,416,062 B1
• Filed: 10/23/2003
• Issued: 08/26/2008
• Est. Priority Date: 10/23/2003
• Status: Expired due to Fees

• Current Assignee: National Aeronautics and Space Administration USA As Represented By The Administrator of The Administrator of The
• Original Assignee: United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration
• Inventors: Arnold, Steven M., Penney, Nicholas
• Primary Examiner(s): NGUYEN, XUAN LAN T
• Application Number:
  US10/693,853
• Time in Patent Office: 1,769 Days
• Field of Search: 188/267, 188/267.1, 188/267.2, 188/266.3, 188/268, 188/290, 188/293, 188/296, 188/161, 188/162, 188/164, 267/140.15
• US Class Current: 188/267.2
• CPC Class Codes: F16F 9/535 Magnetorheological [MR] fluid dampers springs comprising magnetorheological [MR] elastomers F16F1/361

Abstract

A magnetorheological device comprising a housing having a divider within the housing is disclosed and claimed. A rotary impeller having two paddles is rotatably mounted within the housing. The rotary impeller sealingly engages the divider and the paddles in combination with the divider forms a first chamber and a second chamber. Magnetorheological fluid resides in the chambers and a passageway interconnects the first and second chambers. A coil surrounds a portion of the passageway such that when energized the magnetorheological fluid solidifies plugging the passageway. As the impeller rotates, it pushes the incompressible fluid against the divider in the housing and the plug in the passageway and retards and/or stops the motion of the impeller.

Claims

1. A magnetorheological device comprising:

a generally cylindrically shaped housing having cylindrical walls and a divider within said housing;

said housing includes an integral end portion and an end plate removably attached to said cylindrically shaped housing;

a rotary impeller having two paddles mounted within said housing;

said rotary impeller sealingly engaging said divider;

said paddles in combination with said cylindrical walls, said divider, said integral end portion of said housing, and said end plate of said housing form a first chamber and a second chamber;

a magnetorheological fluid residing in said chambers;

a passageway interconnecting said first and second chambers; and

,

a coil surrounding a portion of said passageway enabling the viscosity of the magnetorheological fluid to be varied.

2. A magnetorheological device as claimed in claim 1 wherein said coil is a direct current coil.

3. A magnetorheological device as claimed in claim 1 wherein said coil is an alternating current coil.

4. A magnetorheological device as claimed in claim 2 further comprising a permanent magnet mounted in proximity to said passageway.

5. A magnetorheological device as claimed in claim 3 further comprising a permanent magnet mounted in proximity to said passageway.

6. A magnetorheological device as claimed in claim 1 wherein said passageway is exterior to said housing.

7. A magnetorheological device as claimed in claim 1 wherein said passageway is interior to said housing.

8. A magnetorheological device as claimed in claim 1 further comprising a first edge seal extending from said first paddle and a second edge seal extending from said second paddle.

9. A magnetorheological device as claimed in claim 1 wherein said housing includes a third inner seal affixed to said integral end portion and a fourth seal affixed to said end plate.

10. A magnetorheological device as claimed in claim 6 wherein said passageway includes a tortuous path.

11. A magnetorheological device as claimed in claim 1 further comprising a first edge seal extending from said first paddle, a second edge seal extending from said second paddle, a third inner seal affixed to said integral end portion and a fourth seal affixed to said end plate.

12. A torsional magnetorheological device comprising:

a housing having a divider extending inwardly from said housing;

a hub having a first impeller and a second impeller rotatably mounted within said housing;

said first impeller and said second impeller straddling said divider;

a first chamber formed by said first impeller and said divider and a second chamber formed by said second impeller and said divider;

a passageway interconnecting said first and second chambers;

magnetorheological fluid in said chambers and said passageway;

a magnetic field generated by a coil surrounding said passageway such that an increase in said field increases the viscosity of the magnetorheological fluid;

said magnetorheological fluid in said passageway being solidified upon application of a sufficient magnetic field thereto forming a plug in said passageway;

said hub and impellers rotatably pushing said magnetorheological fluid against said divider and said plug such that said magnetorheological fluid is in compression.