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Answers to common questions and problems when installing rolling bearings

by:JNSN     2021-12-27

One, are there requirements for the installation surface and installation site?

Yes. If there are iron filings, burrs, dust and other foreign objects in the bearing, it will cause noise and vibration when the bearing is running, and even damage the raceways and rolling elements. Therefore, before installing the bearing, you must ensure that the installation surface and the installation environment are clean.

Two, must the bearing be cleaned before installation?

The bearing surface is coated with anti-rust oil. You must clean it carefully with clean gasoline or kerosene, and then coat it with clean, high-quality or high-speed high-temperature The lubricating grease can be installed and used. Cleanliness has a great influence on bearing life and vibration and noise. But what we want to remind you in particular is: fully enclosed bearings do not need to be cleaned and refueled.

Three, how to choose lubricating grease?

Lubrication has an extremely important influence on the operation and life of bearings. Here is a brief introduction to the general principles of choosing lubricating grease. Grease is made of base oil, thickener and additives. The performance of different types and different grades of the same type and different grades of grease vary greatly, and the allowable rotation limit is different. Please pay attention when choosing. The performance of grease is mainly determined by the base oil. Generally, low-viscosity base oils are suitable for low temperature and high speed, and high-viscosity base oils are suitable for high temperature and high load. Thickeners are also related to the lubricating performance, and the water resistance of the thickener determines the water resistance of the grease. In principle, greases of different brands cannot be mixed, and even greases with the same thickener will have a bad influence on each other due to different additives.

Fourth, when lubricating the bearing, the more grease is applied, the better?

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

V. How to install and remove?

Do not directly hammer the bearing end face and non-stressed face during installation, but use a pressure block, sleeve or other installation tools (tooling) to use The bearing is evenly stressed, so do not install it through the transmission force of the rolling elements. If the installation surface is coated with lubricating oil, the installation will be smoother. If the matching interference is large, the bearing should be installed as soon as possible after being heated to 80~90℃ in mineral oil. 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 the disassembly tool to pull outwards and carefully pour hot oil on the inner ring. The heat will expand the inner ring of the bearing and make it easier to fall off.

Sixth, the smaller the radial clearance of the bearing, the better?

Not all bearings require the smallest 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-2 groups, 0 groups, 3 groups, 4 groups, and 5 groups. The clearance values u200bu200bare in order from small to large, and the 0 group is the standard clearance. The basic radial clearance group is suitable for general operating conditions, normal temperature and common interference fit; bearings that work under special conditions such as high temperature, high speed, low noise, low friction, etc. should use large radial clearance; Bearings for precision spindles and machine tool spindles should have a smaller radial clearance; for roller bearings, a small amount of working clearance can be maintained. In addition, there is no such thing as clearance for separate bearings; finally, the working clearance of the bearing after installation is smaller than the original clearance before installation, because the bearing has to bear a certain load rotation, and there is also the bearing coordination and load. The amount of elastic deformation.

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