Hub bearing sealing ring

The utility model provides a hub bearing sealing ring, and relates to the technical field of bearing sealing rings. The hub bearing outer ring is of a circular ring structure of which the inner wall is provided with an inner raceway; a hub bearing inner ring is arranged in the hub bearing outer ring; the hub bearing inner ring is of a circular ring structure with an inner raceway formed in the outer wall. And a group of balls are slidably connected to the center of the outer wall of the hub bearing inner ring in an annular array shape. A part of air in an inflation cavity enters the supporting frame through an air inlet groove, so that the air pressure in the supporting frame is gradually increased, a supporting clamping column slides in a supporting sliding groove, and after the supporting clamping column is clamped into a limiting clamping groove, the sealing ring can be firmly installed in the hub bearing; the problem that in the long-time use process of a sealing ring installed through a gland, due to the