Grease in bearings: importance of grease selection

Antirust performance

The grease used in the bearing must have antirust effect, and the antirust agent * can not be dissolved in water The grease shall have good adhesion and can form an oil film on the steel surface, which can be maintained even if the grease is filled with water

Mechanical stability

Grease will soften during machining, resulting in leakage When there are vibration applications, grease will be thrown into the bearing from the bearing seat If the mechanical stability of the grease is not enough, the grease will be thrown out of the bearing continuously, which will cause mechanical collapse of the soap structure and damage to the use of grease

Oil seal

The oil seal must protect the bearing and lubricant to prevent foreign pollution. No matter sundries or moisture can penetrate into the bearing to prevent damage

Correct installation and maintenance is an important factor to give full play to the longest service life of bearings 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 by pollutants and moisture, and must be installed and lubricated correctly The design of bearing equipment, the condition of oil seal, the type and cycle of lubricant, and even special maintenance all play the same important role

Mixed grease

Never mix incompatible oils and fats. If two incompatible oils and fats are mixed, the consistency will soften and * may be lost due to the easy loss of oils and fats

If you don't know the kind of grease used in the bearing, remove the old grease inside and outside the bearing before adding grease

Classification of oils and fats

Distinguish according to temperature and working conditions:

Grease can be classified according to their allowable working temperature. The consistency and lubricating ability of grease are affected by the working temperature. For bearings operating at a certain temperature, grease with correct consistency and good lubricating effect at the same temperature must be selected Grease is manufactured in different working temperature ranges, which can be divided into low temperature (LT), medium temperature (MT) and high temperature (HT) grease At the same time, there is a kind of grease called EP (extrusion resistance) or em, which is added with additives to strengthen the strength of lubricating oil film

Select grease

If the grease is selected incorrectly, all measures to prevent bearing damage are also futile. It is very important to select a grease whose base oil viscosity can provide sufficient lubrication effect at the working temperature. The viscosity is mainly affected by the temperature. It decreases with the increase of temperature and increases when the temperature decreases Therefore, we must know the viscosity of base oil at working temperature. Machinery manufacturers usually formulate and use some kind of grease. Most standard greases can be used in a wide range