Motor vehicle power train

The powertrain has a combustion engine (12) connected with a crankshaft (22). A coupling arrangement (14) is provided with an input component (24) and an output component (26). A gear assembly (16) is fixed with a gear housing part (40). An output shaft (30) is connected with a driven wheel (20). A countershaft (32, 28) is provided with the gear assembly and a shaft portion (46). The gear housing part is connected with an electric machine (50), which is provided with a traction mechanism gear (54). A traction wheel (56) is provided with the traction mechanism gear.