Sealed bearing

The utility model discloses a sealed bearing. The bearing comprises a bearing inner ring, balls are connected to the outer side of the bearing inner ring in a sliding mode, a bearing outer ring is connected to the outer sides of the balls in a sliding mode, a sealing and lubricating assembly is arranged between the bearing outer ring and the balls, and the sealing and lubricating assembly can conduct sealing and lubricating on the interior when the bearing works. And oil is supplemented when internal oil leaks. The sealing and lubricating assembly comprises an inner clamping sliding ring arranged in a sliding groove in the side wall of the bearing inner ring and an outer clamping sliding ring arranged in a sliding groove in the side wall of the bearing outer ring. According to the utility model, the interior of the bearing is lubricated through the sealing and lubricating assembly, and filling is automatically carried out when the internal pressure is reduced, so that the problem of abrasion caused by the fac