Patent ID: 7624851

Claim:
A fluid-operable rotary drive clutch ( 1 ), comprising drive plates ( 2 ), at least one of which is connected rotationally fixedly to an input assembly ( 3 ) and at least one other is connected rotationally fixedly to an output assembly ( 4 ), operating fluid ( 11 ) being conveyed from a first pressure chamber of a piston/cylinder unit ( 7 ) through an axial bore defined by a connecting line ( 8 ) provided in a clutch shaft ( 12 ) to a second pressure chamber ( 6 ), which is sealed by an annular piston ( 5 ) of a clutch actuating ring ( 9 ) that is axially translatable when pressure is applied to it, a front face of the piston/cylinder unit, facing toward the second pressure chamber ( 6 ), being acted on by the pressure of the operating fluid ( 11 ) to engage or disengage the rotary drive clutch ( 1 ), depending on the function of the rotary drive clutch ( 1 ), and the piston/cylinder unit ( 7 ) being connected to the axial bore of the connecting line ( 8 ) provided in the clutch shaft ( 12 ) rotationally fixedly, pressure-tightly, and co-rotatably with the clutch shaft ( 12 ) from which the axial bore of connecting line ( 8 ) which is provided in the clutch shaft ( 12 ) opens into the second pressure chamber ( 6 ), wherein the piston/cylinder unit ( 7 ) is acted on by an external force generator ( 13 ) comprising a rotor ( 14 ) and a stator ( 15 ), said rotor ( 14 ) being traversable in an axial direction of the piston/cylinder unit ( 7 ) and being journaled so that it is able to move rotationally with respect to said stator ( 15 ), and coupled to the rotatable piston/cylinder unit ( 7 ) by an axial-force rotating bearing ( 16 ).