Rubber ring

The invention provides a rubber ring. The rubber ring comprises an inner rubber layer and an outer rubber layer, and an expansion layer is arranged between the inner rubber layer and the outer rubber layer, and spiral ripples are arranged on the inner surface of the inner rubber layer; the inner wall of the inner rubber layer is coated with a wear-resistance coating; the inner rubber layer is fixedly connected with the expansion layer through an adhesive, and the inner rubber layer is polyurethane rubber; and the wear-resistance coating is composed of evenly-coated wear-resistance particles. The rubber ring has the beneficial effects that the expansion layer is arranged between the inner rubber layer and the outer rubber layer, the buffering capacity of the stressed inner rubber layer is improved, the inner rubber layer is not prone to being broken, and the wear-resistance coating enables the rubber ring to be more resistant to wear, an anti-oxidization thin film can effectively restrain aging of the rubber rings, the service life of the rubber ring is prolonged, and the spiral ripples on the inner rubber layer can be more tightly combined with a connecting component with threads.