Transmission structure of unmanned aerial vehicle engine

The utility model provides a transmission structure of an unmanned aerial vehicle engine, and belongs to the technical field of unmanned aerial vehicles. According to the transmission structure of the unmanned aerial vehicle engine, the engine comprises a crankcase, a crankshaft is arranged in the crankcase, the transmission structure comprises a driving gear connected to the rear end of the crankshaft, an output shaft is arranged outside the crankcase, the rear end of the output shaft is connected with a propeller disc, and the front end of the output shaft is connected with a driven gear in meshing transmission with the driving gear; the driven gear is located above the driving gear, and the rear end of the crankshaft is further connected with a start-stop device. The driving gear and the driven gear are directly engaged to realize speed change, so that the rotating speed obtained by the output shaft is suitable for the unmanned aerial vehicle, the transmission structure is simplified, the stability of the