HYBRID DRIVE SYSTEM

A hybrid drive system includes a first and second spur gear component transmission that drift via a countershaft. A planetary gear set is arranged coaxially to a crankshaft of the internal combustion engine. A first shaft is couplable with the crankshaft. A rotor of the electric motor is couplable with a second shaft. A first input shaft of the first spur gear component transmission is connected, fixed against rotation, with a third shaft. A second input shaft of the second spur gear component transmission is connected, fixed against rotation, with a fourth shaft of the planetary gear set. The first and the second spur gear component transmission each have exactly one spur gear pairing. An interlock switch element for the rotationally fixed connection of two of the shafts of the planetary gear set is arranged between the two spur gear pairings in an axial direction, seen along the input shafts.