The main reducer is one of the core components of the truck drive axle, and its reliability plays an important role in the overall performance of the vehicle. Tapered roller bearings are the key components of the drive axle final drive. The accuracy, vibration and reliability of the tapered roller bearings have a decisive influence on the performance and life of the final drive. Due to the high speed, large load and radial rounding of the main reducer bearing, roller slip, skew and severe friction with the raceway and rib are often caused, which leads to bearing heat. And wear, leading to premature failure. Bearing fatigue failure is one of the main causes of damage to the main reducer of the truck drive axle. Therefore, it is especially important to study the static characteristics and selection of tapered roller bearings. The rear axle final reducer of a heavy-duty truck adopts a spiral bevel gear pair and a cylindrical helical gear pair to realize the power transmission between the shafts. The maximum torque transmitted by the input shaft of the active cylindrical helical gear is 7679 N·m. It is 180r/min and the continuous working time is 8h. According to the structure of the transmission system, a simplified virtual prototype model and power flow of the rear axle final drive are established by using RomaxDesigner (see Figure 1). In this model, an input torque is defined on the input shaft where the active cylindrical bevel gear is located, and two power outputs are defined on the output shaft where the driven spiral bevel gear is located. This paper mainly studies two tapered roller bearings supporting the main reducer drive bevel gear - bearing 1 and bearing 14 (see Figure 1), model number 30311E. The RomaxDesigner planar model is shown in Figure 2. The load case is defined in the RomaxDesigner to run the main reducer virtual prototype model. For more exciting content of MW1950, please download the attachment.
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Virtual prototype modeling
1. Introduction to RomaxDesigner Software
RomaxDesigner is a simulation analysis software specially designed to analyze and analyze the gear transmission system module. The module incorporates the bearing into the system while including the shaft and gear interaction. The whole transmission system is the research object, which makes it possible to drive. The bridge main reducer supports the bearing failure for detailed analysis.
2. Simulation model establishment 
Figure 1 Virtual prototype model of rear axle final reducer 
Figure 2 Intermediate axis RomaxDesigner plane model