Grease in outer ball cylindrical roller bearings: the importance of grease selection

Antirust performance

The grease used in the outer ball cylindrical roller bearing must have anti rust effect, and the anti rust agent can not be dissolved in water. The grease should have good adhesion, which can form an oil film on the steel surface, even if the grease is full of water, it can be maintained

Mechanical stability

Grease will soften during machining, resulting in leakage. When there is an application example of vibration, grease will be thrown into the bearing from the outer ball cylindrical roller bearing seat. If the mechanical stability of grease is not enough, grease will be thrown out of the bearing constantly, which will cause mechanical collapse of soap structure and damage of using grease

Oil seal

Oil seal is necessary to protect the bearing and lubricant to prevent external pollution. No matter impurities or moisture can not penetrate into the bearing to prevent damage

The 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 pollution and moisture, and must be installed and lubricated correctly. The design of the bearing, the condition of the oil seal, the type and lubrication cycle of the lubricant, as well as the special maintenance Play the same important role

Mixed fat

Never mix incompatible oils. If two incompatible oils are mixed, the consistency will become soft, which may cause loss due to oil loss

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

Classification of oils and fats

According to temperature and working conditions:

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

Grease selection

If the wrong choice of grease is made, all measures to prevent bearing damage will be in vain. It is very important to choose 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 temperature rising, and increases when the temperature falls. Therefore, it is necessary to know the base oil viscosity at the working temperature, which is usually made by the mechanical manufacturer Most standard greases can be used in a wide range