Patent ID: 6827194
Filing Date: 2004-12-07
Classification: F16D

Abstract:
An actuation device for a shiftable clutch, the actuation device comprising:a pressure supply for providing a pressure of a pressure medium for actuating the clutch; a first and a second workspace independently in communication with the pressure supply for receiving the pressure; a first piston surface disposed in the first workspace and operably displaceable in a first direction responsive to the pressure in the first workspace, a second piston surface disposed in the second workspace and operably displaceable in a second direction responsive to the pressure in the second workspace, the second direction oriented opposite to the first direction, one of the first and second piston surfaces moving in one of the first and second directions responsive to an application of the pressure in the respective workspace to exert an actuation force; a plurality of levers operably connected to a pressure plate of the clutch; a transmission element operably connected to the piston surfaces for movement in said first and second directions; and first and second transmission rings mounted on the transmission element and acting on the levers to engage and disengage the clutch, the first and second transmission rings being axially displaceable relative to the transmission element by a limited amount counter to a spring force.