Abstract: Disclosed is a viscous coupling that has a housing that carries ribs that are arranged concentrically about a central axis. A rotor is provided that can rotate relative to the housing about the central axis in a predetermined direction. The rotor also carries ribs, and the ribs of the housing and the rotor are arranged in a working chamber surrounded by the housing. Also provided is a fluid reservoir. A fluid discharge line leads from the working chamber to the fluid reservoir. A wiper is moveably arranged between the housing and the rotor and scrapes fluid from the rotor and feeds it to the fluid discharge line. A stop is provided for the wiper and is arranged next to the rotor.

Abstract: The invention relates to a fluid friction clutch (1) having a housing (2, 3) and a clutch disk (4), which is rotatable relative to the housing (2, 3), and which is rotatably arranged at one end (5) of a shaft (6) centrally supported inside the housing (2, 3), having a working chamber (9) between the housing (2, 3) and the clutch disk (4), having a storage chamber (10) for clutch fluid; and having a feed duct (11a, 11b), which leads from the storage chamber (10) to the working chamber (9), characterized by a supply pump element (14), which is rotatable relative to the housing (2, 3) and which is arranged, rotationally fixed, on the shaft (6), and which defines a shear gap (12) with the housing (2, 3); and by a valve (17), which is arranged in the feed duct (11), characterized in that an operative element (7) is arranged on the housing (2, 3).

Abstract: The invention relates to a fluid friction clutch (1) having a housing (2, 3) and a clutch disk (4), which is rotatable relative to the housing (2, 3), and which is rotatably arranged at one end (5) of a shaft (6) centrally supported inside the housing (2, 3), having a working chamber (9) between the housing (2, 3) and the clutch disk (4), having a storage chamber (10) for clutch fluid; and having a feed duct (11a, 1b), which leads from the storage chamber (10) to the working chamber (9), characterized by a supply pump element (14), which is rotatable relative to the housing (2, 3) and which is arranged, rotationally fixed, on the shaft (6), and which defines a shear gap (12) with the housing (2, 3); and by a valve (17), which is arranged in the feed duct (11), characterized in that an operative element (7) is arranged on the housing (2, 3).

Abstract: Described is an installation (10) for producing multi-layer composite tubes (116). The installation (10) has a metal strip unwinding device (44), a metal strip storage device (48) adjoining the metal strip unwinding device (44), a metal strip shaping device (36) adjoining the metal strip storage device (48), an extruder station (12) adjoining the metal strip shaping device (36), and a cooling device (50) adjoining the extruder station (12). The metal strip shaping device (36) serves for shaping the metal strip (38) which is unwound from the metal strip unwinding device (44) into a metal tube with overlapping longitudinal edges which are welded to form the metal tube by means of a welding station (32) at the extruder station (12). In the extruder station (12) the metal tube is covered with an inner plastic layer in fixedly adhering relationship and with an outer plastic layer in fixedly adhering relationship. The composite tube produced in that way is cooled to ambient temperature in the cooling device (50).