To improve the endurance and reliability of cylindrical roller bearings under complex operating conditions, a dynamic model of cylindrical roller bearing (CRB) is developed. The model incorporates roller-raceway contact model to optimize roller profile and is further verified with published data. Systematic parametric analyses are conducted to investigate the influence of flange angle, roller-end sphere radius and roller profile on load distribution, roller tilt, roller skew and contact performance. The results suggest that high flange-roller contact location and contact stiffness can effectively extend fatigue life of the bearing, while low flange-roller contact location can reduce the heat generation. In addition, roller profile has negligible effect on load distribution, but an optimized roller profile can improve the anti-tilt capacity. The developed model provides a tool for the internal design and frictional loss optimization of CRB under combined loads.
This paper developed a coupled model, incorporating the quasistatic model, fatigue life model, and mixed lubrication model, to investigate the effect of misalignment angle on high-speed cylindrical roller bearings. The model is verified by comparing with the published literature results. Then, a parametric analysis is carried out. The results show that as the misalignment increases, the load distribution is basically unchanged, but the fatigue life of the roller bearing decreases due to the variation of contact pressure, and the skewing moment of single roller contact pair increases. Furthermore, the optimal design of roller profile needs to consider the effect of lubrication in order to improve the fatigue life of roller bearings. In general, the optimal crown drop is too small according to the design from the slicing technique.
In order to analyze the influence of tolerance values of key parameters for cylindrical roller bearings under combined axial and radial loads, a coupled model, incorporating a dynamic model of cylindrical roller bearings, contact model, and fatigue life model, is developed to investigate the effect of flange angle, roller-end radius, interval of roller length gauge, and roller profile on contact performance and fatigue life. The results show that the grouping design of flange angle and roller-end radius in the tolerance range was helpful for reducing contact ellipse truncation. The difference of the roller length would change the axial load distribution of the bearings. For the longest roller located in the bottom position, the bigger the difference, the bigger the roller tilt angle and carried-axial load. The (0, +2.5 μm) tolerance range of the crown drop can limit the difference of the fatigue life within 20% in the current analysis.
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