Abstract: An overload protection device (1) with a primary section (4) for the coupling of the overload protection device (1) with a drive device (2) and with a secondary section (6) for coupling of the overload protection device (1) with an operating section (7). The primary section (4) and the secondary section (6) can be turned around a rotation axis (8), with respect to one another, around a rotation angle phi. A spring element (5), which is interposed between the primary section (4) and the secondary section (6) is formed in such a way that the spring element (5) counteracts a rotation of the primary and secondary sections (4, 6). The invention is characterized by a spring element (5) that extends concentrically around the rotation axis (8) in an angular range of at least 180°.

Abstract: An overload protection device (1) with a primary section (4) for the coupling of the overload protection device (1) with a drive device (2) and with a secondary section (6) for coupling of the overload protection device (1) with an operating section (7). The primary section (4) and the secondary section (6) can be turned around a rotation axis (8), with respect to one another, around a rotation angle phi. A spring element (5), which is interposed between the primary section (4) and the secondary section (6) is formed in such a way that the spring element (5) counteracts a rotation of the primary and secondary sections (4, 6). The invention is characterized by a spring element (5) that extends concentrically around the rotation axis (8) in an angular range of at least 180°.

Abstract: A drive unit for a conveyor, in particular for a belt conveyor with a driving motor, includes a hydrodynamic clutch having a pump and turbine wheel which jointly form a working chamber which can be filled with operating material. The hydrodynamic clutch can be at least indirectly coupled with a drive shaft of the conveyor. An operating material supply system is allocated to the hydrodynamic clutch and includes a closed circulation having a bypass circuit. An operating material tank is disposed in the bypass circuit and above the clutch.

Abstract: The invention relates to a method for operating a drive unit for a conveyor system, in particular for a chain conveyor drive with at least one driving machine and at least one hydrodynamic clutch. The hydrodynamic clutch can be filled with operating medium in which, during continuous operation, the operating medium is guided in a closed circuit. The circuit includes an inlet line associated such that the operating medium losses in the circuit are compensated for and in which the temperature in the closed circuit is ascertained and compared with a permissible temperature value. The invention includes the feature that upon exceeding an permissible temperature value in the closed circuit, the inlet line and the outlet line are simultaneously connected in the circuit for the purpose of volumetric cooling.