Axle head sealing structure of speed reducer

The utility model relates to a sealing structure of the shaft end of a reducer, which comprises a reducer box body, a bearing and a bearing cover. Lubricant return channels are arranged on the box body and the bearing cover, the bearing cover is shaped like a box and provided with a cylindrical box body part and a disc-shaped end cover part, which are integrated together; the bearing is arranged in and tightly matches the cylindrical box body part; the bearing cover is arranged on and statically matches the box body, and the matching surfaces are provided with a sealing ring; the back rotation matching surfaces of the bearing cover and a shaft are provided with a lip-shaped sealing ring or a tetrafluoroethylene sealing ring. Because the utility model is only provided with two sealing surfaces, the area and chance of leakage is lessened; because a shaft sleeve is left out, the structure is simplified, and the cost is reduced; because a dynamic sealing surface is provided with a sealing ring, not only is the moisture in the air prevented from getting in and damaging the oil quality, but also oil leakage is prevented when the reducer stops; because the bearing and the bearing box are integratively assembled, when the utility model is repaired or the bearing is replaced, the box cover does not need to be taken off, as a result, the reparation is more convenient and quick, the time of reparation is shortened, and the cost of reparation is saved.