Abstract
Tapered roller bearings (TRBs) are applied extensively in the field of high‐speed trains, machine tools, automobiles, etc. The motion prediction of main components of TRBs under grease lubrication will be beneficial to the design of bearings and the selection of lubricating grease. In this study, considering the dynamic contact relationship among the cage, rollers, and raceways, a multibody contact dynamic model of the TRB was established based on the geometric interaction models and grease lubrication theories. The impacts of load, grease rheological properties, and temperature on the roller tilt and skew and the bearing slip were simulated by using the fourth‐order Runge–Kutta method. The results show that the roller tilt angle in the unloaded zone is obviously larger than that in the loaded zone, while the roller skew angle in the unloaded zone is smaller than that in the loaded zone. As the speed increases, the roller tilt and skew and the bearing slip become more serious. Bearing preload can effectively reduce the bearing slip but will make the roller tilt and skew angle increase. The roller skew angle and the bearing slip decrease with the increase of the grease plastic viscosity. The roller tilt angle increases with the increase of the plastic viscosity. The yield stress of the grease has little effect on motions of the roller and cage. The influence of temperature on the roller and cage motions varies with the type of grease used.
Highlights
Tapered roller bearings, as the separable bearing, have the ability to withstand combined loads, large load-carrying capacity, well adjustability, and long service life
For the beginning of operation of the grease-lubricated TRB, the analysis of the TRB dynamic characteristics should be made to clarify the relation between the bearing dynamics and the lubricating grease. e bearing lubrication and dynamics affect each other but both have important impacts on the bearing failure, service life, and reliability
Shock and Vibration and developed the dynamic analysis program ADORE for TRBs; the cage whirling and roller skew were analyzed under di erent cage clearances and traction-slip relations
Summary
As the separable bearing, have the ability to withstand combined loads, large load-carrying capacity, well adjustability, and long service life. There exists a film inside the bearing contacts at the beginning of bearing operation, formed by the combination of thickener and base oil [1, 2]. Shock and Vibration and developed the dynamic analysis program ADORE for TRBs; the cage whirling and roller skew were analyzed under di erent cage clearances and traction-slip relations. Deng [8] analyzed the dynamics of the TRB with oil lubrication by using the Adams-Bashforth–Moulton multistep method and studied the cage whirling and roller skew of the bearing. Compared with other rolling bearings, the research on dynamics of grease-lubricated TRBs is relatively de cient. For the beginning operating stages of grease-lubricated tapered roller bearings, considering dynamic interactions in the bearing contacts and grease lubrication theories, a multibody contact dynamic model of TRB under the grease-lubricated condition was established. For the beginning operating stages of grease-lubricated tapered roller bearings, considering dynamic interactions in the bearing contacts and grease lubrication theories, a multibody contact dynamic model of TRB under the grease-lubricated condition was established. e bearing dynamics, e.g., the roller tilt and skew and the bearing slip, was analyzed. e impacts of speed, preload, temperature, and grease rheological properties on the bearing dynamics were studied
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