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Non-standard bearing installation steps

Edit: Rihoo Industry (Hongkong) Co.,Limited    Date: Aug 20, 2018

The cooperation between the non-standard bearing and the shaft is generally a transition fit. The fit between the race and the bearing housing bore is generally a clearance fit. The middle shaft of the two-way bearing should be fixed on the shaft to prevent rotation relative to the shaft. The mounting method of the bearing is generally the case where the shaft rotates. Therefore, the cooperation between the inner ring and the shaft is a win-win cooperation, and the cooperation between the outer ring of the bearing and the bearing chamber is a clearance fit.

When installing a non-standard bearing, the perpendicularity of the shaft ring and the centerline of the shaft should be checked. The method is to fix the dial gauge to the end surface of the casing, so that the contact of the table top rotates the bearing on the bearing shaft raceway, and observes the dial gauge pointer. If the pointer is yawed, the shaft circle and the shaft center line are not perpendicular. When the case hole is deep, it can also be tested with an extended dial gauge. When the bearing is installed correctly, the seat ring can automatically adapt to the rolling of the rolling elements, ensuring that the rolling elements are located in the upper and lower ring raceways. If the installation is reversed, not only will the bearing work abnormally, but the mating surfaces will be severely worn. Since the difference between the shaft ring and the seat ring is not obvious, the assembly should be extra careful and do not make mistakes. In addition, there should be a gap of 0.2-0.5mm between the bearing ring and the bearing housing hole to compensate for the error caused by inaccurate machining and installation. When the center of the bearing ring is offset during operation, this gap can be Make sure it is automatically adjusted to avoid friction and make it work properly. Otherwise, it will cause severe damage to the bearing.

First, how to choose grease?

Lubrication has a very important influence on the operation and life of non-standard bearings. Here is a brief introduction to 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.

Second, non-standard bearings must be cleaned before installation?

Non-standard bearing surfaces are coated with anti-rust oil, you must carefully clean with clean gasoline or kerosene, and then apply clean high-quality or high-speed high-temperature grease to install. The effect of cleanliness on rolling 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.

Third, 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 element 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 rolling bearing to expand, making it easier to fall off.

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

Yes. If foreign matter such as iron filings, burrs, dust, etc. enters 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.

Fifth,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 lubricant filled in the rolling bearing is preferably 1/2 to 1/3 of the internal space of the bearing, and should be reduced to 1/3 at high speed.

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