Novel planetary reduction gearbox

The novel planetary reduction gearbox comprises a fixed flange and an output flange, one side of the fixed flange is fixed to a power mechanism, the other side of the fixed flange is connected with the output flange through a bearing, and a coupler is installed in the fixed flange through a bearing; a fixed gear ring, an output gear ring and a planetary gear mechanism are arranged in the output flange, the fixed gear ring is fixed on the fixed flange, the output gear ring is fixed on the output flange, the fixed gear ring and the output gear ring are arranged side by side and have a tooth number difference, the planetary gear mechanism comprises a sun gear shaft and a planetary gear, and the sun gear shaft is connected with the coupler. The planetary gear is meshed with the fixed gear ring and the output gear ring at the same time; compared with the prior art, the two split type gear rings are adopted to replace a multi-stage gear ring in the background technology, the machining difficulty can be effectively lowered, the number of parts can be reduced, meanwhile, a large speed ratio can be kept on the basis that a transmission chain is shortened, and the gear ring has the advantages of being novel in structure, efficient in transmission, easy and convenient to manufacture, stable, reliable and the like.