Abstract: A braking and/or clutch arrangement has a cooling system which is sealed off with respect to excess pressure. Liquid coolant is fed under pressure to friction elements and first comes in contact with the surface areas of the friction elements whose relative speed is the highest. The operating device required for operating the friction elements is connected with the clutch half which in the operation is subjected to lower rotational accelerations to reduce heat formation.

Abstract: A device for producing a bead on a circumference of a hollow cylinder seeks to minimize the risk of unwanted deformations of the hollow cylinder such as wrinkles or bulges which can result when an area of the hollow cylinder to be beaded is forced inward without support. In a preferred embodiment, the device of producing a bead on a hollow cylinder includes an internal tool and an external tool which can be adjusted in a controlled manner in the radial direction, the internal tool comprising a support mandrel and an inner ring which is adjacent to the supporting mandrel in the axial direction and is capable of being adjusted radially relative thereto, and the external tool includes an outer ring which surrounds the inner ring and a hold-down ring which is axially adjacent the outer ring and capable of being adjusted radially relative thereto.