Thrust roller bearings are used to bear axial load-based shafts, combined warp load, but the warp load must not exceed 55% of the axial load. Compared with other thrust roller bearings, this kind of bearing has lower friction coefficient, higher speed and self-aligning ability. The rollers of the 29000 type bearings are asymmetrical spherical rollers, which can reduce the relative sliding between the stick and the raceway during work, and the rollers are long, large in diameter, and the number of rollers is large. The load capacity is large, and oil lubrication is usually used. Grease lubrication is available at low speeds.