The working temperature of precision angular contact ball bearings is related to the bearing material, angle, preload, working load, working speed, lubrication method, cooling form, and ambient temperature. Normally, precision bearings with heavy load, high speed and grease lubrication have a relatively high working temperature.
In general, the inner and outer rings of precision angular contact ball bearings can withstand a high temperature of 150°C, and the working temperature of the cage made of high-quality phenolic laminated tubes should not exceed 120°C. For other bearings made of copper or aluminum alloy cages, the maximum allowable operating temperature can reach 150°C.
Usually, if the bearing is not artificially cooled and is not affected by the external thermal environment, the temperature of the inner ring will always exceed the temperature of the outer ring, and the temperature of the rolling elements will be higher than that of the inner ring.
Excessive temperatures can change the internal state of the bearing. For precision angular contact ball bearings, during high-speed operation, due to the difference between the inner ring and the outer ring, the actual preload force of the bearing is greater than the assembly preload force, and the bearing may experience premature wear and seizure. Therefore, the working temperature of the bearing must be well controlled.
When using oil mist lubrication or oil-air lubrication, according to the lubrication and cooling conditions, the allowable working temperature of the bearing is much higher than that of grease lubrication.