Thrust roller bearings are separable bearings, such bearings greater rigidity, small footprint, can withstand a large axial load, and low sensitivity to impact load. The structure type can be divided into thrust cylindrical roller bearings thrust tapered roller bearings and spherical roller thrust bearings of three. Such vehicles can be used bearing retainer system entities and pressed into plates. Thrust cylindrical roller bearings and tapered roller thrust bearing allows low speed, often used in thrust bearings can not use the occasion, and thrust both spherical roller bearings can withstand axial load is also radial loads and can be heavy