The maximum temperature of the bearing

Bearing temperature is further divided into surface temperature and operating temperature.

The surface temperature refers to the temperature of the bearing’s outer surface when the bearing is operating under specified service conditions. At this point, the bearing temperature should not exceed the temperature of the conveyed medium by more than 20℃, and the maximum temperature must not exceed 80℃. For externally mounted bearings, the surface temperature should not exceed the ambient temperature by more than 40℃, and the maximum temperature must not exceed 80℃.

In bearing applications, the temperature rise of the bearing must not exceed 305°C above the ambient temperature, and the maximum operating temperature must not surpass 75°C. Lubrication of rolling bearings reduces friction and wear between internal components, prevents seizing and scuffing, extends the bearing's service life, dissipates frictional heat, avoids overheating of the bearing, inhibits the aging of the lubricant itself, and simultaneously prevents foreign particles from entering the bearing interior, as well as protecting the bearing against rust and corrosion.

Extended Materials

Standard for Identifying Abnormal Bearing Temperature Rise

The temperature of a bearing can generally be estimated based on the ambient temperature outside the bearing housing. If oil holes are available, the temperature of the bearing’s outer race can be measured directly. As the bearing starts to operate, its temperature gradually rises and typically stabilizes after about 1 to 2 hours. The normal operating temperature of a bearing varies depending on factors such as the machine’s thermal capacity, heat dissipation rate, rotational speed, and load. If the lubrication installation is improper, the bearing temperature may rise sharply, leading to abnormally high temperatures. In such cases, the machine must be stopped immediately, and appropriate preventive measures should be taken.

Using a thermal sensor, the operating temperature of the bearing can be monitored at any time, and when the temperature exceeds the specified value, an automatic alarm or shutdown can be triggered to prevent fuel-related accidents.