Abstract: The invention relates to a hydrodynamic modular unit having two rotating impellers—a primary impeller (3) and a secondary impeller (4)—which jointly form at least one toroidal working chamber (5), having at least one inlet (6) into the toroidal working chamber (5) for operating medium and an outlet (7) out from the toroidal working chamber, the inlet (6) and the outlet (5?) being connected to each other via a circuit (8), and having an operating-medium source (10) that can be coupled to the inlet at least indirectly. The inventive hydrodynamic modular unit is characterized by the following features: means (9) for coupling the operating-medium source to the inlet and the outlet simultaneously or in a slightly time-delayed manner.

Abstract: The invention relates to a modular constructed multifunctional system. According to the invention, the modular constructed multifunctional system is endowed with the following characteristics: an input (E) and an output (A); a drive element (2) in the form of a hydrodynamic element (3), comprising a drive side (6) which can be coupled in a torsion-proof manner to the input, and a driven side (7) coupled to the output and at least one primary wheel and a secondary wheel (9); a switchable coupling (5) between the input and the output; a free wheel (F) arranged between the driven side of the drive element and the output; a brake device (13) for stationary support and braking of the secondary wheel on a housing (15); the switchable coupling is embodied in the form of a running friction coupling; a drive element, a braking element and a free wheel are incorporated into a modular unit.

Abstract: A hydrodynamic coupling, whose degree of filling is determined by a scoop tube, has a plurality of radially arranged elongated depressions on the inner surface of the coupling casing (simultaneously forming a scoop chamber) driven on the primary side. These depressions have the purpose of efficiently causing rotation of the oil ring formed inside the scoop tube chamber so that the oil ring rotates as far as possible at the same speed as the coupling casing. Owing to the small size of the radial depressions in a fine arrangement on the inner surface of the coupling casing the occurrence of pressure fluctuations at the scoop tube and the hydraulic system downstream therefrom is avoided.