A detailed explanation of bearing types classified by use characteristics
A detailed explanation of bearing types classified by use characteristics
According to different working environments and use needs, bearings can be subdivided into the following categories: high-temperature bearings, low-temperature bearings, corrosion-resistant bearings, sulfur-resistant bearings, anti-magnetic bearings, vacuum bearings, self-lubricating bearings, ceramic bearings and high-speed bearings.
It is suitable for applications with operating temperatures exceeding 120°C, and is widely used in aerojet engines, atomic reactors, X-ray tubes, semiconductor manufacturing equipment, and melting, coating and electroplating equipment.
Designed for extremely low temperatures below -60°C, such as LNG pumps, liquid nitrogen/hydrogen pumps, butane pumps, liquid propulsion devices in spacecraft and missiles. The common structures are single row deep groove ball bearings and cylindrical roller bearings.
3. Corrosion-resistant bearings
It is used in humid or corrosive media, such as seawater, steam and acid-alkali environments. It is mainly made of stainless steel materials (such as 9Cr18 and 9Cr18Mo), and the cage is often made of 0Cr19Ni9 or beryllium bronze; High-temperature stainless steel such as Cr14Mo4 is used in high-temperature environments; For large bearings, martensitic stainless steels (such as 1Cr13 and 2Cr13) are mostly made of surface nitriding treatment.
4. Sulfur-resistant bearings
For hydrogen sulfide (H? S) of harsh gas environments. Ordinary bearing steel is easy to fail due to hydrogen embrittlement or electrochemical corrosion, so it is necessary to use special material bearings made of nickel-chromium alloys such as 00Cr40Ni55A13, but its hardness (51~55HRC) is slightly lower, the bearing capacity is relatively limited, and special attention needs to be paid to surface integrity when using.
5. Anti-magnetic bearings
Made of non-magnetic materials, it has very low permeability and is suitable for use in environments with strong magnetic fields. Beryllium bronze (QBe2) is a commonly used material with excellent strength, elasticity, wear resistance and corrosion resistance, and is widely used in atmosphere, seawater and other environments.
6. Vacuum bearing
It is used in high vacuum environment (vacuum degree higher than 1.33Pa), and is commonly used in aerospace equipment, X-ray tubes, magnetrons and other applications. The typical structure is deep groove ball bearings or angular contact ball bearings, which are often made of stainless steel materials such as GCr15 bearing steel or 9Cr18, and new alloys such as G60 are used in some high-pressure vacuum occasions.
7. Self-lubricating bearings
It has a built-in lubrication mechanism and does not require an external lubrication system. Typical constructions include single row angular contact ball bearings and radial short cylindrical roller bearings for equipment where lubrication is limited or difficult to maintain.
Adapt to extreme working conditions, such as high speed, high temperature, low temperature, strong corrosion, strong magnetic field, vacuum and high pressure environment. It is ideal for high-end applications due to its high bearing capacity, excellent heat resistance, high ultimate speed, low friction, long life, corrosion resistance and good electrical insulation.
9. High-speed bearings
Suitable for Dm·n values exceeding 1.0×10 mm·r/min (Dm is the average diameter of the rolling element, n is the speed of the inner ring). At present, the value has exceeded 3.0×10, and even reached 3.5×10, which is widely used in high-speed machine tools, aerospace and precision equipment.
Post time: Jun-03-2025
