Grease in bearings: The importance of choosing grease
author: Leila
2025-05-07
Rust-proof performance
The grease used in bearings must have a rust-proof effect, and the rust-proof agent should preferably be insoluble in water. The grease should have good adhesion to form an oil film on the surface of the steel, which can be maintained even if the grease is filled with water.
Mechanical stability
Grease will soften during mechanical processing, leading to leakage. When there is a vibration application example, the 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 continuously thrown out of the bearing, which will cause the structure of the soap to collapse mechanically and damage the use of the grease.
Oil seal
The oil seal is Bearings and lubricants must be protected from external contamination. No debris or moisture can penetrate into the bearings to prevent damage.
Correct installation and maintenance are important factors in maximizing the service life of bearings. At the same time, attention must be paid to the cleanliness of the bearings, the correctness of the bearing selection, and the use of appropriate installation and maintenance tools. Bearings must be protected from contaminants and moisture, and must be properly installed and lubricated. The design of the bearing equipment, the condition of the oil seal, the type of lubricant and the lubrication cycle, and even special maintenance all play an equally important role.
Correct installation and maintenance are important factors in maximizing the service life of bearings. At the same time, attention must be paid to the cleanliness of the bearings, the correctness of the bearing selection, and the use of appropriate installation and maintenance tools. Bearings must be protected from contaminants and moisture, and must be properly installed and lubricated. The design of the bearing equipment, the condition of the oil seal, the type of lubricant and the lubrication cycle, and even special maintenance all play an equally important role.
Mixed greases
Never mix incompatible greases. If two incompatible greases are mixed, they will not be compatible. When grease is mixed, the consistency usually becomes softer, and eventually the grease may be lost due to easy loss of grease.
If you don't know which grease the bearing originally used, you must first remove the old grease inside and outside the bearing before adding grease.
If you don't know which grease the bearing originally used, you must first remove the old grease inside and outside the bearing before adding grease.
Classification of grease
Differentiation based on temperature and working conditions:
Grease can be classified according to their allowable operating temperature. The consistency and lubrication ability 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. Grease is manufactured based on different operating temperature ranges and can be divided into low temperature (LT), medium There are two types of grease: medium temperature (MT) and high temperature (HT). There is also a type of grease called EP (extruded) or EM, which has additives to strengthen the lubricant film.
Grease can be classified according to their allowable operating temperature. The consistency and lubrication ability 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. Grease is manufactured based on different operating temperature ranges and can be divided into low temperature (LT), medium There are two types of grease: medium temperature (MT) and high temperature (HT). There is also a type of grease called EP (extruded) or EM, which has additives to strengthen the lubricant film.
Choosing grease
If the wrong grease is selected, all measures to prevent bearing damage will be in vain. It is important to choose a grease whose base oil viscosity can provide sufficient lubrication at the operating temperature. Viscosity is mainly affected by temperature. It decreases as the temperature rises and increases when the temperature drops. Therefore, it is necessary to know the base oil viscosity at the operating temperature. Machinery manufacturers usually specify the use of a certain type of grease. Most standard greases can be used in a wide range.
What factors must be considered when selecting bearings?
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