Drive unit and power transmission device

The utility model relates to a driving unit and a power transmission device, and the driving unit comprises a rotor shaft, a first supporting part is formed at the first end of the rotor shaft, and a first bearing assembly used for supporting the rotor shaft is arranged in the circumferential direction of the first supporting part; a first connecting part is formed at the second end and is provided with a first spline structure; an input shaft; the third end of the first inner cavity is provided with a second spline structure matched with the first spline structure, and the third end abuts against the end, away from the second end, of the first connecting part. And the stopping piece is connected to the second end of the rotor shaft, is stopped at one end, far away from the third end, of the second spline structure, and is used for limiting the axial movement range of the rotor shaft when the rotor shaft is subjected to a load towards the direction of the first bearing assembly. According to the driving unit,