Abstract: In the past, most of the research on tapered roller modification focused on the influence of roller modification on the stress distribution and load distribution in the contact area of bearings, and few systematic studies were made on the thermal characteristics of the contact area of double-row tapered roller bearings based on roller and raceway modification. Aiming at the problem that the double row tapered roller bearing used in heavy truck axle had large load and the failure mode was mostly high temperature failure, the thermal characteristics of the double row tapered roller bearings were studied. Firstly, based on the dynamic theory of rolling bearing and the theory of roller and raceway logarithmic modification,a dynamic model of double row tapered roller bearings for heavy truck axles was established. Then, based on the friction power consumption theory and heat transfer theory, the dynamic and friction power consumption research model and bearing thermal analysis model of doublerow tapered roller bearing for heavy truck axle were established, and the influence of roller and raceway modification parameters on bearing thermal characteristics was studied. Finally, a bearing temperature test bed was built, and the simulation results were verified by comparative tests. The research results show that the influence of the roller and raceway modification parameters on the temperature distribution of the corresponding roller and raceway contact area is basically the same. When the modification coefficient is greater than 0.8, the effect of the end stress concentration can be eliminated if the modification coefficient is too small, and the maximum temperature of the roller and raceway contact area increases if the modification coefficient is too large. The position of the highest temperature in the contact area changes with the change of the modification offset. The roller and raceway are shaped at the same time. When the deviation of the roller and raceway is close to each other, the maximum temperature in the contact area between the roller and the large rib is lower.
Key words:  rolling bearing; double row tapered roller bearing; bearing dynamics; logarithmic modification; friction power consumption; thermal analysis; thermal characteristics of contact area of bearing