Oil hydraulic cylinder piston sealing ring

The utility model discloses a piston sealing ring of an oil hydraulic cylinder. The sealing device comprises an arc-shaped sealing ring A and an arc-shaped sealing ring B, attaching buffer assembliesare arranged in the middles of the ends, close to each other, in the arc-shaped sealing ring A and the arc-shaped sealing ring B correspondingly. Protruding blocks are arranged on one side of the arc-shaped sealing ring A and one side of the arc-shaped sealing ring B, fixing blocks are arranged on the other side of the arc-shaped sealing ring A and the other side of the arc-shaped sealing ring B,hinge check blocks hinged to the arc-shaped sealing ring A and the arc-shaped sealing ring B are arranged on the sides, close to the positioning blocks, of the arc-shaped sealing ring A and the arc-shaped sealing ring B. According to the device, the convex block, the hinge stop block and the fixed block are matched with one another; the arc-shaped sealing ring A and the arc-shaped sealing ring B are easier to install, the