The inner and outer rings of angular contact ball bearings are equipped with raceways, and the inner and outer rings can generate relative displacement along the axial direction of the bearing. This type of bearing is suitable for bearing composite loads and can simultaneously carry radial and axial loads. The axial load that angular contact ball bearings can withstand will increase correspondingly with the increase of contact angle α. The contact angle refers to the angle formed by the line connecting the contact point between the steel ball and the raceway in the radial plane and the straight line perpendicular to the bearing axis.