Thread locking four-point contact ball bearing

The invention belongs to the technical field of bearing assembling and manufacturing, and particularly relates to a thread locking four-point contact ball bearing which comprises an outer ring, a combined inner ring, a retainer and a steel ball, and the steel ball is kept in a roller path between the outer ring and the combined inner ring through the retainer; the combined inner ring comprises a first inner ring and a second inner ring, a spigot extending to the end face of the other side of the bearing is arranged on the inner diameter of the raceway side of the first inner ring, threads are arranged on the outer diameter of the spigot, the second inner ring is of an annular structure with threads on the inner diameter, and the second inner ring and the first inner ring are connected in a screwed mode through the threads. And the outer diameter surface of the first inner ring and the outer diameter surface of the second inner ring jointly form an inner ring raceway for guiding the steel balls. The four-point