Borgwarner Inc.

William J Zdeblick

R Keith Martin

John M Kremer

Graham M Annear

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.

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Geneva, IL, United States of America

William J Zdeblick