Drive train, in particular a hybrid drive train

1. A drive train comprising:

a torque converter, which is operatively connected with an input through a clutch, wherein the clutch comprises an emergency operation actuation device with at least one emergency operation actuation element, which defines a centrifugal oil cavity, which comprises oil and is coupled with the input, wherein:

the clutch is configured as a wet operating disc clutch with a piston;

the clutch is actuatable by the piston through pressure loading;

the piston defines the centrifugal oil cavity of the emergency operation actuation device and the piston is coupled non-rotatably, but axially movable, with a clutch hub;

the centrifugal oil cavity is defined by a centrifugal oil cavity defining wall and the piston is moveable in an axial direction relative to the centrifugal oil cavity defining wall; and,

the centrifugal oil cavity defining wall is coupled non-rotatably but axially movable with the clutch hub.

2. A drive train comprising:

an input;

a torque converter: and,

a clutch including:

a first disc support non-rotatably connected to the torque converter;

a second disc support non-rotatably connected to the input;

a plurality of discs non-rotatably connected to the inner or the outer disc support;

a first piston arranged to close the clutch to non-rotatably connect the first and second disc supports; and,

an emergency operation piston, separate from the first piston and arranged to displace at least a portion of the discs in the plurality of discs to non-rotatably connect the first and second disc supports, wherein:

the input is connected to a primary drive including an internal combustion engine; and,

the input is connected to a secondary drive including an electric motor.