Maintenance-free duplex rack rail wheel set

The utility model discloses a maintenance-free duplex rack rail wheel set which comprises a large gear, a rack rail wheel body is arranged on the side edge of the large gear, bearings are fixed to the large gear and the rack rail wheel body, inner bushes are connected to the inner sides of the bearings, and meanwhile the inner bushes are connected with a transmission shaft. Connecting bolts are arranged on the large gear and the rack rail wheel body in a concentric and equal-angle mode and used for connecting and fixing. The toothed rail wheel further comprises toothed blocks which are concentrically distributed on the toothed rail wheel body at equal angles, and the toothed blocks and the toothed rail wheel body can slide. According to the maintenance-free duplex rack rail wheel set, an elastic sealing structure is adopted, when the rack rail wheel body is meshed with an upper-stage gear, the automatic lubricating effect can be achieved, the comprehensive lubricating effect is achieved in cooperation with a