Abstract: An operating assembly for a mechanical connection of an engine to a work machine includes a drive shaft unit and an output shaft unit which are connected by a dynamically controllable multi-plate clutch. A holding brake acts on the output shaft unit. The operating assembly includes a control unit. The holding brake is a dynamically controllable brake.

Abstract: The present invention concerns a rotary drive clutch that is fluid-operable by a piston/cylinder unit rigidly coupled to a clutch shaft and bearing-mounted so as to rotate therewith.

Abstract: In a hydraulic circuit for controlling a clutch/brake system having a clutch that is disposed separately from the brake in a main drive of a mechanical press, wherein the brake is spring-loaded in a direction opposite to an engagement direction of the clutch, a piston/cylinder unit is provided that moves the clutch and the brake into a coupling position or a braking position, respectively. A pressure line connects a press safety valve to the piston/cylinder unit for generating torque at the clutch. A bidirectionally passable hydraulic connection connects a metering piston unit to the piston/cylinder unit in parallel to the press safety valve.

Abstract: A shiftable device which acts as a brake or coupling, such as a frictional brake or a frictional clutch, includes a first component and a second component and a pressure ring arranged between the first and second components, wherein the pressure ring is connected non-rotatably or stationary to the first component, while being movable by an actuating and restoring device between two work positions which are axially offset relative to each other. At least one friction element which is compressed in an active position of the pressure ring is arranged between the pressure ring and the second component. A plurality of radially resilient tongues which each have a fixed tongue end are fastened without play in the area of the first component. A plurality of guide members supported on the pressure ring and connected to the other movable tongue ends serve to convert the axial movement of the pressure ring into a radial movement of the movable tongue ends.