DYNAMO FOR AN INTERNAL COMBUSTION ENGINE

The present invention relates to an electric generator (1), preferably dynamo, for an internal combustion engine, having a stator (2), a rotor (3), a housing (4) which has a housing casing (6), a front side wall (7) and a rear side wall (8), an outer rotationally fixed impeller wheel (9), a primary air inlet (12) which has a plurality of inlet openings (13) formed in the rear side wall (8), an air outlet (14) which has a plurality of outlet openings (15) formed in the front side wall (7), a primary air path (16) which leads inside the housing (4) from the primary air inlet (12) to the air outlet (14), wherein the rotating impeller wheel (9) generates, in the region of the outlet openings (15), a partial vacuum which generates the primary air flow (31) which enters the primary air inlet (12), follows the primary air path (16) and exits through the air outlet (14). Improved cooling is brought about by means of a secondary air inlet (18) which has a plurality of secondary inlet openings (19) formed in the housing casing (6), and by means of a secondary air path (20) which leads within the housing (4) from the secondary air inlet (18) to the air outlet (14), wherein the partial vacuum generated by the rotating impeller wheel (9) generates a secondary air flow (32) which enters through the secondary air inlet (18), follows the secondary air path (20) and exits through the air outlet (14).