There are two categories in rolling contact problems

Rolling load distribution in the bearing life and work that affect the reliability of key factors, many researchers have long been highly valued. Rolling load distribution problem for theoretical research conducted a systematic review methodology elaborated classical, classical numerical methods, the characteristics of modern numerical methods and the corresponding important conclusion that the focus of future research. There are two categories in rolling contact problems, one is the rolling element and raceway ring local contact problem, the other is the overall deformation of the bearing and balance issues, namely load distribution in the bearing problem. The main purpose of load distribution in the system is to clear the bearing deformation and bearing conditions, the deformation of the bearing inner contact into the resulting deformation, the jacket ring relative elastic displacement; carrying case the packet Payload size, direction and nature: ball bearings suitable for light load to bear, roller bearings suitable for heavy load and impact load. When subjected to pure axial load bearing, thrust bearing is generally used; when rolling under pure radial load, generally used in deep groove ball bearings or cylindrical roller taper roller bearing  when rolling under pure radial load at the same time, there is little axial load, the choice of deep groove ball bearings, angular contact ball bearings, tapered roller bearings and self-aligning ball or spherical roller bearings; when the axial load is large, the choice of the contact angle larger angular contact ball bearings and tapered roller bearings, or use radial bearings and thrust bearings together, which in very high axial loads or special requests, especially when there are large axial rigidity adapt appropriate.
2. Permissible speed: Due to different types of bearings are very different. Generally, the friction is small, less heat bearing suitable for high speeds. Rolling in the design should strive to lower the speed limit working conditions.
3. Rigidity: bearings under load, the bearing rings and rolling elements contact point will produce elastic deformation, the deformation is proportional to the load, the ratio determines the size of the bearing stiffness. Generally by bearing preload to improve the rigidity of the bearing; addition, the design of the bearing support, considering the combination and arrangement of the bearing can also improve the support rigidity of the bearing.