Self-positioning mounted bearing

The utility model discloses a self-positioning installation bearing, which comprises an outer ring, an inner ring, a plurality of steel balls, a retainer and two sealing rings, the outer ring is coaxially arranged on the radial outer side of the inner ring, the plurality of steel balls are installed on the retainer, the retainer and the two sealing rings are respectively installed between the outer ring and the inner ring, and the outer ring and the inner ring are coaxially arranged. The two sealing rings are arranged on the two axial sides of the retainer respectively, an outer lip of each sealing ring is in contact sealing fit with the outer ring, an inner lip of each sealing ring is in contact sealing fit with the inner ring, a positioning ring is integrally arranged on the inner lip of one sealing ring in the axial direction, and the positioning ring extends to the axial outer side of the inner ring. According to the self-positioning mounted bearing, the mandrel is positioned through the positioning ring