Internal combustion engine

An internal combustion engine is provided having a common engine transmission housing having a crankcase chamber in which a crankshaft having a longitudinal central axis is rotatably accommodated and a transmission chamber in which a shift transmission is accommodated, and having a longitudinal axis and a vertical axis extending transversely to the longitudinal central axis of the crankshaft, the invention relates to an engine transmission housing for an internal combustion engine, comprising at least one working cylinder having a piston working surface and a working piston which can be moved in the working cylinder along the piston working surface, the working piston being coupled to a crankshaft by means of a connecting rod, and the engine transmission housing having a clutch receiving chamber in which a clutch device is arranged, the primary drive pinion is configured to transmit drive power provided by the internal combustion engine in the direction of the shift transmission, and the clutch device engages