Hydraulic circuit, torque transmission device having a hydraulic circuit, and method for operating a hydraulic circuit

A hydraulic circuit for a torque transmission device having a hydraulically actuable dual-clutch, comprising:

• a first hydraulically actuable clutch that is closed in a rest state;
• a second hydraulically actuable clutch that is closed in the rest state;
• a pressure generating device and/or a pressure accumulator;
• a main pressure line hydraulically coupled to the pressure generating device and/or the pressure accumulator;
• a first distributor pressure line hydraulically coupled to the main pressure line, the first distributor pressure line for a hydraulic supply of a first part circuit;
• a second distributor pressure line for a hydraulic supply of a second part circuit and that is hydraulically disconnectable from the first distributor pressure line, the second distributor pressure line being separate from the first distributor pressure line;
• a return reservoir;
• a main return line hydraulically coupled to the return reservoir;
• a first collector return line for the hydraulic supply of the first part circuit and hydraulically coupled to the main return line;
• and
• a second collector return line for the hydraulic supply of the second part circuit and that is hydraulically disconnectable from the first collector return line, the second collector return line being separate from the first collector return line;
• wherein the hydraulic circuit is configured such that a hydraulic medium present in the main pressure line can be loaded with a working pressure by the pressure generating device and/or the pressure accumulator, and the hydraulic medium can be discharged for pressure dissipation via the main return line into the return reservoir,
• wherein the hydraulic circuit can be operated in a first operating state and a second operating state and can be switched between the first operating state and the second operating state,
• wherein the first hydraulically actuable clutch is assigned to the first part circuit and can be hydraulically connected to the first distributor pressure line or the first collector return line,
• wherein the second hydraulically actuable clutch is assigned to the second part circuit and can be hydraulically connected to the second distributor pressure line or the second collector return line, and
• wherein the hydraulic circuit is configured such that either the first collector return line or the second collector return line is hydraulically connected to the main pressure line in the second operating state.