Abstract: A shaft coupling having two attachment elements that are rotatable relative to one another and that are connected to one another by a rotationally resilient assembly, and further having a dampening device which is active between the attachment elements for the purpose of suppressing torsional vibrations of the rotationally resilient assembly is disclosed. The rotationally resilient assembly comprises two ramp discs that are rotatable relative to one another and that support one another at least indirectly. One disc is supported in a rotationally fixed and rigid manner on one of the attachment elements and the other disc is supported in a rotationally fixed and axially resilient manner on the other one of the attachment elements by a spring. The dampening device is a viscous coupling having a hub connected to one of the attachment elements and a housing connected to the other one of the attachment elements.

Abstract: A mechanical clutch with two elements (11, 21) which, for the purpose of positively engaging one another, are provided with opposed end toothings which are adapted to one another, the first element (11) being rotatably mounted and axially supported, the second element (21) also being rotatably mounted and axially supported, and further being axially blocked in a first position for the purpose of being non-rotatably engaged with the first element (11), and being axially moveable into a position in which it is freely rotatably and disengaged from the first element (11), with a device for selectively axially blocking the second element (21), the clutch further comprising: a cavity system whose shape is variable and which is filled with a magneto-rheological fluid; a displacing member which can be moved between a first position and a second position, which delimits the cavity system and which is connected to the second element (21); and an electro-magnet (37) which can magnetize at least part of the magneto-rheol