Seal structure of ultrathin-walled bearing with constant cross sections

The utility model discloses a seal structure of an ultrathin-walled bearing with constant cross sections, which comprises an outer ring, an inner ring, a rolling element, a cage, a first sealing ring, a second sealing ring, an outer ring notch and an inner ring boss step, wherein the inner diameter of the outer ring is provided with the symmetrical outer ring notch, the outer diameter of the inner ring is provided with the symmetrical inner ring boss step, the first sealing ring is clamped between the outer ring notch and the inner ring boss step, the outer diameter of the first sealing ring is connected with the inner diameter of the outer ring notch and fixed in the outer ring notch, and the second sealing ring is adhered to the surface of the first sealing ring, radially extends along the inside of one end of the first sealing ring, and is radially attached to the inner ring boss step. According to the utility model, a radial contact seal structure is adopted, and the inner ring boss step is a right-angle step, therefore, the seal structure is good in sealing effect, reduces the starting friction torque, and increases the operation flexibility.