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Grease in bearings: the importance of choosing a grease

Anti-rust performance

The grease used in the bearing must have an anti-rust effect, and the anti-rust agent can be insoluble in water. The grease should have good adhesion to form an oil film on the surface of the steel, even if the grease is filled with water.

Mechanical stability

Grease will soften during machining and cause leakage. When there is an application example of vibration, grease will be thrown from the bearing seat into the bearing. If the mechanical stability of the grease is not enough, the grease will be thrown out of the bearing continuously, which will cause soap The structure caused mechanical breakdown and damage using grease.

Oil seal

The oil seal needs to protect the bearings and lubricants to prevent foreign pollution. No foreign matter or moisture can penetrate into the bearings to prevent damage.

Correct installation and maintenance is an important factor for the long service life of the bearing. At the same time, attention must be paid to the cleanliness of the bearing, the correctness of bearing selection, and the selection of appropriate installation and maintenance tools. The bearing must be protected from contamination and moisture pollution, and must be correct Ground installation and lubrication. The design of bearing equipment, the condition of the oil seal, the type of lubricant and the lubrication cycle, as well as special maintenance all play the same important role.

Mixed grease

Do not mix incompatible fats.If two incompatible fats are mixed, the consistency will usually become soft, and it may be lost due to the easy loss of fat.

If you don't know which kind of grease the bearing originally used, you must first remove the old grease inside and outside the bearing before adding grease.

Classification of grease

Differentiated according to temperature and working conditions:

Grease can be classified according to their allowable operating temperature.The consistency and lubricity of grease are affected by the operating temperature. Bearings operating at a certain temperature must choose grease with the correct consistency and good lubrication effect at the same temperature. Manufactured in different operating temperature ranges, it can be divided into low temperature (LT), medium temperature (MT) and high temperature (HT) greases. At the same time, a type of grease is called EP (extrusion resistance) or EM, with additives to strengthen The strength of the lubricant film.

Choose grease

If the wrong grease is selected, all the measures to prevent bearing damage are also in vain. It is important to choose a grease whose base oil viscosity can provide sufficient lubrication effect at operating temperature. The viscosity is mainly affected by temperature, and it increases with temperature. It goes down, it goes up when the temperature drops. So it is necessary to know the viscosity of the base oil at the operating temperature. Machine manufacturers usually formulate and use some kind of grease. Most standard greases can be used in a wide range.



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