The temperature at which bearings can operate is a very broad concept. The bearing is composed of inner ring, outer ring, rolling element, cage, lubrication, sealing and other components. If the bearing operates stably at a certain temperature, these components not only need to be able to withstand this temperature, but also need to bear and operate at this temperature.
When bearings are running, there are certain temperature differences in their inner and outer rings. Generally speaking, we use the temperature of the stationary ring of the bearing as the reference position for measurement.
For ceramic bearings, the temperature is lower than that of bearing steel, as the ceramic material is lighter and has high rotational speed, dry friction, oil-free self-lubrication, etc.
1. Stable temperature for heat treatment of bearing steel:
Bearing steel can maintain stability in size, strength, and other aspects after certain heat treatment.
Of course, when heated, the internal metal structure and composition of the steel material will also change, and the important changes for appearance are changes in size and hardness.
The stable temperature for heat treatment of general bearings is 150 ℃, usually marked with SN:
Stable temperature of bearing heat treatment and its corresponding suffix
2. Temperature range of bearing cage:
Nylon holder -40 ℃ -120 ℃
3. Temperature range of bearing seals:
Metal dust covers usually do not require special consideration for temperature ranges.
Rubber material seals usually need to determine the high temperature range within which the seal can operate based on the different rubber materials used for sealing. The working range of Nitrile rubber is -40 ℃ -100 ℃, and that of fluororubber is -30 ℃ -200 ℃
4. Temperature of bearing lubrication:
Temperature is an important key factor affecting lubrication. As the temperature increases, the viscosity of the base oil of the grease decreases.
