1. Requirements for the installation surface and installation site
Suppose there are iron filings, burrs, dust, and other foreign objects entering the bearing. In that case, the bearing will generate noise and vibration during operation, and may even damage the raceway and rolling element. Therefore, before installing the bearing, you must ensure the installation surface and environment are clean.

2. Bearings must be cleaned before installation
The surface of the bearing is coated with anti-rust oil. You must carefully clean it with clean gasoline or kerosene, and then apply clean or high-speed and high-temperature lubricating grease before installation and use. Cleanliness has a great impact on the life and vibration noise of the bearing. But we want to remind you that fully enclosed bearings do not need to be cleaned or refueled.

3. Selection of grease
Lubrication has an important impact on the operation and life of the bearing. Here we briefly introduce the general principles of selecting grease. Grease is made of base oil, thickener, and additives. The performance of different types and different brands of grease of the same type varies greatly, and the allowed rotation is different. Be sure to pay attention when selecting. The performance of grease is mainly determined by the base oil. Generally, low-viscosity base oil is suitable for low temperature and high speed, and high-viscosity base oil is suitable for high temperature and high load. Thickeners are also related to lubrication performance. The water resistance of thickeners determines the water resistance of grease. In principle, different brands of grease cannot be mixed. Moreover, even greases with the same thickener will have a bad effect on each other due to different additives.

4. Addition of grease
When lubricating, the more grease is applied, the better. This is a common misconception. Too much grease in the bearing and the bearing chamber will cause excessive stirring of the grease, resulting in very high temperatures. The amount of lubricant filled in the bearing should be 1/2 to 1/3 of the internal space of the bearing and should be reduced to 1/3 at high speed.

5. Installation and removal of bearings
When installing, do not directly hammer the bearing end face and non-stressed surface. Use a pressure block, sleeve, or other installation tools to make the bearing evenly stressed. Do not install it through rolling elements. If the installation surface is coated with lubricating oil, the installation will be smoother. If the interference fit is large, the bearing should be placed in mineral oil heated to 80~90℃, and installed as soon as possible. The oil temperature should be strictly controlled not to exceed 100℃ to prevent the tempering effect from reducing the hardness and affecting the size recovery. When disassembly is difficult, it is recommended that you use a disassembly tool to pull outward while carefully pouring hot oil on the inner ring. The heat will expand the inner ring of the bearing, making it easier to fall off.

6. Selection of radial clearance of bearings
Not all bearings require a very small working clearance. You must choose the appropriate clearance according to the conditions. In the national standard 4604-93, the radial clearance of rolling bearings is divided into five groups - group 2, group 0, group 3, group 4, and group 5. The clearance values ​​are from small to large, and group 0 is the standard clearance. The basic radial clearance group is suitable for general operating conditions, normal temperatures and commonly used interference fits; bearings working under special conditions such as high temperature, high speed, low noise, and low friction should use large radial clearance; for spindles, machine tool spindle bearings, etc., it is appropriate to use smaller radial clearance; for roller bearings, a small amount of working clearance can be maintained. In addition, there is no clearance for separated bearings; the working clearance of imported bearings after installation is smaller than the original clearance before installation, because the bearings have to bear a certain load rotation, and there is also elastic deformation caused by the bearing fit and load.

Bearings can be divided into sliding bearings and rolling bearings according to their specific structures and working properties. As the name suggests, sliding bearings are plane bearings with a relatively large contact area, so the degree of wear will be relatively large, that is, the friction coefficient is large. Therefore, sliding bearings require special materials, and anti-friction is its biggest feature. The characteristics of rolling bearings are different from sliding. It converts the sliding friction between the shaft seat and the shaft into rolling friction, which will reduce losses. Then the inner and outer rings, rolling elements, and cages interact to complete the work.

Whether it is a rolling bearing