Self-compensating oil seal for hub unit of agricultural machine

The utility model discloses a self-compensating oil seal for an agricultural machine hub unit, and belongs to the technical field of agricultural machine manufacturing. Comprising an outer framework tightly matched with a hub inner hole and an inner framework tightly matched with the outer diameter of a shaft, an inner sealing body is attached to the side, facing the shaft, of the outer framework, the inner sealing body extends towards the inner framework and forms a sealing lip, and the sealing lip is pressed on the inner wall of an inner framework inner ring of the inner framework. A tightening spring is arranged on the outer surface of the sealing lip, an outer sealing body is attached to the outer wall of the inner framework outer ring of the inner framework, the outer sealing body extends towards the outer framework outer ring of the outer framework to form a plurality of dustproof lips, and the dustproof lips are in interference fit with the inner wall of the outer framework outer ring. The hub unit has