Bearing rotation type air door shaft

The utility model discloses a bearing rotation type air door shaft which comprises a pin shaft (1), a bearing (2), an upper shaft sleeve (3) and a lower shaft sleeve (4). Bearing grooves are formed in the upper shaft sleeve (3) and the lower shaft sleeve (4); the upper shaft sleeve (3) is welded on a door leaf, and the lower shaft sleeve (4) is welded on a door post; the bearing (2) is embedded into the bearing groove; and the bearing (2) positioned in the upper shaft sleeve (3) is connected with the bearing (2) positioned in the lower shaft sleeve (4) through a pin shaft (1). The hinge pin and the shaft sleeve slide back and forth through the rolling bearing, friction resistance between the hinge pin and the shaft sleeve when the air door is opened and closed is reduced, certain thrust and pressure can be applied to the hinge pin of the door frame due to the weight of the air door when the air door is opened or closed, and the rolling pressure bearing is embedded in the shaft sleeve. Pressure and thrust appl