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Frequently asked questions when installing rolling bearings

Edit: Rihoo Industry (Hongkong) Co.,Limited    Date: Sep 07, 2018

First, must the bearings be cleaned before installation?

The bearing surface is coated with anti-rust oil. You must carefully clean it with clean gasoline or kerosene, and then apply clean high-quality or high-speed high-temperature grease to install it. The effect of cleanliness on bearing life and vibration noise is very large. But we must remind you that the fully enclosed bearings do not need to be cleaned and refueled.

Second, how to choose grease?

Lubrication has a very important impact on the operation and life of the bearing. Here is a brief overview of the general principles for selecting grease. Grease is made of base oil, thickener and additives. The grease performance of different types and different grades varies greatly. The allowable rotation limit is different. Be careful when selecting. The performance of grease is mainly determined by the base oil. Generally, the low viscosity base oil is suitable for low temperature, high speed and high viscosity for high temperature and high load. The thickener is also related to the lubricating properties, and the water resistance of the thickener determines the water resistance of the grease. In principle, the different greases of the brand cannot be mixed, and even the grease of the same thickener may have a bad influence on each other due to the different additives.

Third, what are the requirements for the installation surface and installation site?

Yes. If there are iron filings, burrs, dust and other foreign matter in the bearing, it will cause noise and vibration during the operation of the bearing, and even damage the raceway and rolling elements. Therefore, before installing the bearings, you must ensure that the mounting surface and the installation environment are clean.

Fourth, how to install and disassemble?

Do not directly hammer the bearing end face and the non-stress surface during installation. The bearing should be evenly stressed by the clamp, sleeve or other installation tools (tooling). Do not install by the rolling body transmission force. If the mounting surface is coated with oil, it will make the installation smoother. If the interference is large, the bearing should be placed in mineral oil and heated to 80~90 °C and installed as soon as possible. The oil temperature should not be strictly controlled to exceed 100 °C to prevent the tempering effect from decreasing and affecting dimensional recovery. When disassembling is difficult, it is recommended that you use the disassembly tool to pull outward while carefully pouring hot oil onto the inner ring. The heat will cause the inner ring of the bearing to expand, making it easier to fall off.

5. When lubricating the bearings, the more grease is applied, the better?

When lubricating bearings, the more grease is applied, the better. This is a common misconception. Excessive grease in the bearing and bearing chambers will cause excessive agitation of the grease, resulting in extremely high temperatures. The amount of bearing filling lubricant should be one-half to one-third of the inner space of the bearing, and should be reduced to 1/3 at high speed.

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