improved cooling conditions, etc., can improve the speed limit.

aligning performance relative to the centerline axis of the bearing hole centerline is tilted, the bearing capacity can still work. Double row radial spherical ball backing bearings and double row spherical roller bearings have good self-aligning performance. Roller bearings and needle roller bearings allow the inner and outer rings are tilted relative to the axis. Various types of rolling bearings allow different angle of inclination, such as single row radial ball bearings for the 8 'to 16', double row radial spherical ball bearings for the 2 ° ~ 3 °, tapered roller bearings ≤ 2 '.
Speed ​​limit in certain load bearing and lubrication conditions allowed maximum speed. Limiting speed and bearing type, size, precision, clearance, cage, load and cooling conditions and so on. Bearing operating speed should be less than the speed limit. Use high-precision bearings, improved cage structures and materials, the use of oil mist lubrication, improved cooling conditions, etc., can improve the speed limit.
2, the main bearing lubrication grease and oil lubrication. Lubricated with grease leakage is not easy, easy to seal, use a long time, easy maintenance and high film strength, but the friction torque than oil lubrication big, not for speed. Loading of the bearing grease bearing space should not exceed 1/2 to 1/3, otherwise too much lubricant, leaving the stirring overheated bearings. Oil lubrication and cooling effect is good, but more complex seals and oil installations. Oil viscosity is generally 0.12 to 0.2 cm / sec. Load, high operating temperatures should be selected high viscosity oil, high speed when the choice of low viscosity oil. Lubrication with oil bath lubrication, drip lubrication, oil mist lubrication, fuel injection pressure lubrication and oil lubrication. Oil bath lubrication, the oil level should not be higher than the bottom of the rolling element center. If you press the elastic hydrodynamic lubrication theory of design and selection of the bearing lubricant viscosity, the contact surface of the film will be separated. At this time, in a stable load, bearing life can be increased many times.