Bearing

The invention belongs to the technical field of bearings, and discloses a bearing. The disclosed bearing comprises a bearing outer ring (1), a bearing inner ring (3) and a steel ball (2) between the bearing inner ring and the bearing outer ring. The bearing is characterized in that rolling channels of the bearing inner ring (3) and the bearing outer ring (1) are both in dual-rolling-channel structures, and the interval between the two rolling channels is 63mm; the size of the steel ball (2) is phi44.45mm; the contact angle of bearing is 50 degrees; the curvature of the rolling channels of the bearing inner ring (3) and the bearing outer ring (1) is 23.11mm; and the rolling channel eccentricity is 0.678mm. According to the bearing disclosed by the invention, the rolling channels of the bearing inner ring (3) and the bearing outer ring (1) are both in dual-rolling-channel structures, and the steel ball with specific size and the rolling channel curvature, eccentricity and the contact angle are adopted, under th