Magnetorheological fluid dampers
Patent 5277281 Issued on January 11, 1994. Estimated Expiration Date: 
June 18, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 18, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesInventorsAssigneeApplicationNo. 900571 filed on 06/18/1992US Classes:188/267, Using magnetic flux188/267.2, Magnetic fluid or material (e.g., powder)188/298, Forming flexible wall enclosure for fluid188/318, And passage venting fluid external to chamber188/320, Tortuous path orifice188/322.14, Foot valve188/322.15, Piston valve detail (e.g., seat design, structural arrangement, metering element)188/322.22, Thrust member or piston structure267/64.15, With retarder267/140.14, With electronic or magnetic control267/219Elastomeric springExaminersPrimary: Butler, Douglas C.Attorney, Agent or FirmForeign Patent References
International ClassF16F 009/04AbstractMagnetorheological (MR) fluid dampers are optimized. Dimensional relationships involved in the flow of magnetic flux are related to an operational parametric ratio of magnetic flux density in the fluid to the flux density in the steel. A magnetic valve is utilized to change the flow parameters of the MR fluid and, hence, the operational characteristics of the damper. Several embodiments depicting improved piston designs, including spool as well as toroidal configurations, are disclosed. In addition, both single and twin-tube housing designs are presented.Field of SearchUsing magnetic fluxForming flexible wall enclosure for fluid And passage venting fluid external to chamber Fluid through or around piston within chamber Tortuous path orifice Foot valve Piston valve detail (e.g., seat design, structural arrangement, metering element) Thrust member or piston structure With retarder With electronic or magnetic control Elastomeric spring Mounted at end of retarder | |
