US Patent 7584608 Hydrodynamic clutch

A hydrodynamic clutch having a pump and turbine and a case wherein a collection bath is provided underneath the case for the collection of work medium being discharged from the case vent openings and in which the case is immersed. There is in the collection bath at least one drainage opening with a drainage flange which is positioned above the floor of the collection bath with a predetermined clearance distance from the bottom. The case is immersed so far in the collection bath that it reaches into an area underneath the drainage flange.