The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 11, 2012
Filed:
Oct. 30, 2009
Robert T. Foister, Rochester Hills, MI (US);
Thomas W. Nehl, Shelby Township, MI (US);
William C. Kruckemeyer, Beavercreek, OH (US);
Oliver Raynauld, Senils, FR;
Robert T. Foister, Rochester Hills, MI (US);
Thomas W. Nehl, Shelby Township, MI (US);
William C. Kruckemeyer, Beavercreek, OH (US);
Oliver Raynauld, Senils, FR;
BWI Company Limited S.A., Luxembourg, LU;
Abstract
A magnetorheolgical (MR) damper includes a piston assembly having a primary channel disposed along a longitudinal axis and contained in a cylinder. MR fluid is also contained in the cylinder. The piston assembly having a primary channel, or primary channel MR piston assembly, includes a piston body having a first end axially spaced from a second end and defining a hole therethrough. The primary channel is defined in an outer body surface of the piston body from the hole at the second end to a coil groove in the outer body surface about the axis. A secondary channel is defined in the outer body surface from the coil groove towards the first end to improve MR damper force performance at low primary channel MR piston assembly velocities.