Torque overlay facility for hybrid drive

The invention relates to a torque overlay apparatus for use in a hybrid propulsion system for vehicles, in particular for use in passenger vehicles, wherein the hybrid drive comprises an internal combustion engine, an electric motor and the torque superimposing means and are superposed by means of the torque overlay means is a torque of the engine with a torque of the electric motor and the torque superimposing means the output side is connected to an output of the vehicle and the torque overlay means torque-resistant a first and a second torque input and torque output, and a first translation means and a second translation means, and the electric motor with the first torque input is coupled, and the engine to the second torque input torque firmly couplable is, said first torque input to the first translation means and the second torque input to the second translation device is a torque-resistant, and said transmission means are each driven side coupled to the torque output of the torque overlay means torque-resistant, said first translation means comprises at least two alternative selectable gear ratios, and at least the second translation means an alternatively selectable gear stage, the first translation means for displaying the at least two alternative selectable gear ratios comprising at least one planetary gear set, and said second translation means comprises a spur gear set to represent said at least one selectable gear stage at least. In order to provide a torque superimposition device, which carries the disadvantages of the prior art better account and in particular allows operation of both the engine and the electric motor in their respective optimal operating point, the invention provides that, for alternatively selectable torque-fixed connection of the second translation means to the a planetary gear is arranged positively and / or frictionally engaged clutch to the planetary gear set.