Involute one tooth difference planetary reducer of engine driven mill

The utility model relates to mills in the technical field of electric machines and tools, in particular to an involute one tooth difference planetary reducer of engine driven mills. The involute one tooth difference planetary reducer comprises a shell, an inner gear, an eccentric shaft, a first planetary gear, a second planetary gear and a reducer output shaft. The inner gear is arranged in the shell. The eccentric shaft comprises an eccentric shaft body, a first eccentric boss and a second eccentric boss which are integrally arranged, the first planetary gear is connected to the first eccentric boss, the second planetary gear is connected to the second eccentric boss, and the first planetary gear and the second planetary gear are arranged on the inner side of the inner gear and meshed with inner teeth of the inner gear. The reducer output shaft comprises an output shaft body and a disc which are integrally arranged, the disc is connected with a plurality of pin shafts in the circumference direction, each pin shaft penetrates through the first planetary gear and the second planetary gear, and a grinding barrel is connected to the output shaft body of the reducer output shaft. The involute one tooth difference planetary reducer has the advantages of being large in transmission ratio, compact in structure, small in size, light in dead load, long in service life and the like.