Investigation Of Working Performance For Tapered Roller Bearing In Drive Rear Axle Main Speed Reducer

The drive axle is one of important components to the automobile,play an important role in the automobile transmission system. Taperedroller bearing is the critical part of main reducer in automobile drivingaxle. It’s accuracy, vibration and reliability play a decisive role in theperformance and life of the drive axle. When tapered rolling bearingsof the drive axle main reducer is working, rolling body will generateslipping, deflecting, dramatic friction between the raceway and the ribsdue to large loading, high speed. This will cause bearing fever and wear,leading to premature bearing failure. While tapered rolling bearingsfailure is one of the main reasons for the working reliability of the driveaxle main reducer. Therefore, the study of the working performance oftapered rolling bearings in the drive axle main reducer is veryimportant to improve the reliability of the automobile driving axle.In this paper, tapered rolling bearings of heavy-duty automobiledrive axle main reducer is the object of study, through studying loadingdistribution, lubricant film, fatigue life and other workingperformances of tapered rolling bearings, to provide theoreticalguidance for the actual work.By analyzing the final assembly structure of automobile drive axle,set up mechanics model of the main reducer driving bevel gear shafting,deduce the axial force, the radial force and the circumferential force,from the power plant reached to the driving bevel gear. Consideringstatically indeterminate factors of the three bearing support system,analysis loading conditions of three supporting bearing in the main bevel gear shafting. This thinking solve external load of tapered rollingbearings is closer to the real working.Spatial relationship of tapered rolling bearing is built; and deducethe centrifugal force and gyroscopic moment expression of taperedrolling bearings. Quote the rolling kinematics relations and Hertztheory, consider the inertia load, gyroscopic torque and bearingdeflection, to establish a more scientific tapered rolling bearingmechanical model, and use Newton-Rap son iterative method to solvethe rolling bearing mechanical equilibrium equations. Study, discussionand analysis of bearing loads of rolling elements and its generatrix’sloading distribution influencing rule by preloading, radial, axial andmoment loads.For a better evaluation of tapered rolling bearing’s workingperformance in the drive axle main reducer. In the basis of uponworking, lubrication impact tapered rolling bearing’s workingperformance in the drive axle main reducer is studied. Consideringsurface roughness of rolling elements and race way, isothermal steady-state elastic hydrodynamic lubrication model is built; use compositeiterative method and numerical solve the model equations. To filmshape, the influence from the contact surface roughness amplitude andwavelength is discussed, and analysis the impact of the differentpreload situation on the contact surface friction coefficient. This paperpresent a method, which is put the lubricating oil film and surfaceroughness friction factor as friction factor in the analysis of finiteelement software. Each part of tapered rolling bearing is analyzed byFEA. Under various loading conditions, contact stress curves betweenrolling element on the bearing and inside and outside the raceway areanalyzed and discussed. On this basis, there carried out experimentswith the drive axle assembly test bench. Studies have shown that thispaper predict the rolling life is reasonable, which provides a good theoretical basis for maintenance cycle of automobile drive axle.Working performance study system software of tapered rolling bearingin automobile drive axle main reducer is researched, which not onlyconsider the uneven distribution characteristics of rolling elementcontact stress, but also consider elastic fluid lubrication of taperedrolling bearing’s rolling elements with inside and outside the raceway.Based on computer simulation, fatigue life of tapered rolling bearing inthe automobile drive axle main redactor can be accurately forecasted.This paper provides the theoretical basis for forecast andassessment reliability of the drive axle main reducer. It is also providesuseful lessons to working performance study of tapered rolling bearingsin the automobile drive axle main redactor.