The quality of the rear axle driven by an automobile and the length of its life depends on the life of the gear pair and the bearing. The bearing life is closely related to the material of the bearing, manufacturing accuracy, heat treatment, assembly adjustment, and the like. The clearance adjustment of the bearing is adjusted by the use of the unit, which is not conducive to bearing life control. If double row tapered roller bearings are used, most of the factors that affect the bearing life can be controlled in the production enterprises. The production company will use the shaft to fit the hole's interference and actually use the temperature rise to influence the bearing clearance. Statistical research, the final determination of the best bearing clearance, and then provided directly to the user to complete the assembly, without adjustment. The use of double-row tapered roller bearings has the following advantages: (1) Improve the assembly efficiency of the rear axle assembly. (2) The clearance control of the pinion bearing is reasonable, to avoid the problem of adjusting the clearance of the tapered roller bearing at this stage, and also to avoid the large declination of the pinion due to large bearing clearance, which affects the meshing of the gear pair. Reduce gear life. (3) It is conducive to maintenance without adjustment. (4) Cancel the spacer in the bearing seat to shorten the distance from the flange to the center of the axle housing. Increase the bearing width, increase the bearing support points, and increase the bearing support strength. Conducive to the main reduction fitted with retarder. Tapered roller bearings are now widely used in automotive axle bearings. The application of tapered roller bearings on the final drive of the drive axle can improve the assembly efficiency, reduce the assembly difficulty, reduce the dependence on the familiarity of assembly workers, ensure the stability of product quality, and also reduce the difficulty of maintenance. Artistar , https://www.cn-artistar.com