Self-propelled work machine

The invention relates to a self-propelled work machine, comprising an undercarriage (12) which is provided with drive wheels (14) which are driven by means of a drive device, and with a superstructure (18) which is rotatably mounted on the undercarriage (12) and in which a power unit (30) is arranged and to which a boom (22) for a work tool is mounted, characterized in that the power unit (30) drives an electrical generator (34) which is a power source for an electric motor (38) arranged in the superstructure (18), which is the drive device for the drive wheels (14) arranged on the undercarriage (12).