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:
Jun. 12, 2001
Filed:
Sep. 15, 1998
John M. Kremer, Sterling Heights, MI (US);
R. Keith Martin, Imlay City, MI (US);
Graham Annear, Farmington Hills, MI (US);
William J. Zdeblick, Geneva, IL (US);
BorgWarner Inc., Troy, MI (US);
Abstract
A friction device includes piston assembly is responsive to the pressure of fluid in an expandable chamber to move between disengaged and engaged positions thereby actuating a clutch pack to connect and disconnect drive and driven members. The piston assembly includes a main body having an outer ring annularly disposed about the main body. The outer ring includes at least one orifice extending therethrough. The outer ring is movable between a first position wherein the orifice is closed and the drive and driven members are disconnected and a second position where the orifice is open to allow the flow of pressurized fluid through the orifice and from the outer diameter of the clutch pack between the adjacent plates and disks to the inner diameter of the clutch pack to cool same when the drive and driven members are connected.