High-speed-ratio hub reduction gear

The utility model discloses a hub reduction gear with a large speed ratio. Wherein power is connected with one end of the input shaft through a spline; a primary sun gear at the other end of the inputshaft is meshed with a plurality of primary planet gears; the primary planet wheel is meshed with an inner gear ring of the end cover to drive a primary planet carrier; the primary planet carrier ismeshed with the secondary sun gear; the second-stage sun gear is meshed with a plurality of second-stage planet gears, the second-stage planet gears are meshed with an inner gear ring to drive a second-stage planet carrier, the second-stage planet carrier is meshed with a third-stage sun gear, a third-stage sun gear is meshed with a plurality of third-stage planet gears, the third-stage planet gears are meshed with the inner gear ring, and the third-stage planet carrier outputs power to form a third-stage planet gear transmission system; the vibration damper has the advantages of being novel in design principle, unique