Bearings are one of the most crucial components of motor products. Special operating conditions impose extremely high demands on the bearings themselves and their lubrication. For instance, high-temperature environments, low-temperature environments, large temperature fluctuations, and environments with pollution factors all present special conditions that require careful selection of bearings. Some bearing manufacturers have developed special-purpose bearings suitable for these conditions. This is essential information that motor designers must understand and master to prevent motor unreliability caused by improper bearing selection.
Deep groove ball bearings suitable for high and low temperatures are basically designed in the same way as standard deep groove ball bearings. These bearings are equipped with a design featuring a ball loading gap, capable of withstanding moderate radial loads and axial loads in both directions. They have a larger internal clearance and are fitted with special cages. The clearance range of high-temperature deep groove ball bearings is four times that of C5 clearance, preventing the bearings from getting stuck during rapid cooling. The surfaces of the bearings and dust covers are treated with manganese phosphating to prevent corrosion and improve operational performance. For high and low-temperature bearings with pressed steel cages and no seals, a mixture of polydiol and graphite is used as the lubricant, and they can operate within a temperature range of -40°C to 250°C. However, when used in high-temperature environments above 200°C, solid lubricants should be selected.
The high-temperature bearings with dust covers on both sides can prevent some solid contaminants from entering. These bearings are pre-filled with twice the amount of lubricant as ordinary bearings, but they are not suitable for non-rotating applications. For bearings used at higher temperatures, segmented graphite blocks are used as cage retainers. The working temperature range is from -150°C to +350°C. These segmented graphite blocks separate the balls and function like a regular cage, while also serving as a lubricant. The dust covers on both sides of the bearings can axially guide the graphite blocks inside and prevent the entry of solid contaminants. When the bearings rotate, a small amount of graphite powder from the graphite blocks falls off to lubricate the raceways and balls of the bearings. Another advantage of this design is that it does not have a negative impact on the environment, as no harmful gases or vapors are emitted even at extremely high temperatures.
This bearing, suitable for high temperatures and higher rotational speeds, is the cutting-edge product in the high-temperature bearing series. It features a uniquely designed pure graphite conical cage, which resolves many limitations encountered in applications at high temperatures.
Post time: May-19-2025