Bicycle hub sealing structures

A bicycle hub sealing structure comprises: axle shaft, nuts, hub enclosure, a sleeve and a ratchet wheel, wherein, the hub enclosure rear end and the sleeve front end are attached to the axle shaft respectively through the first ball bearing and the second ball bearing, meanwhile the second ball bearing is combined with the sleeve through the balls, the nuts are positioned on the front and rear ends of the axle shaft, the rear end of the ratchet wheel is located inside the hub enclosure, and is combined with the sleeve through the balls, the front end of the hub enclosure has a housing cavity, the rear end of the sleeve is extended into the bulge loop inside the housing cavity, a sleeve oil seal is provided between the bulge loop outside wall and the housing cavity inside wall, and a leakage-proof gasket is provided between the bulge loop inside wall and the ratchet wheel. The sleeve oil seal and the leakage-proof gasket are of a simple structure to provide double sealing for the ratchet wheel, and to prevent foreign objects to enter the hub enclosure. The bent portion and the seal are flexible and will not affect the relative rotation of the various cooperating components inside the hub enclosure, ensuring smooth riding of the bicycle.