Introduction to the method of solving the heating fault of SKF bearing by lubrication

There are several ways to lubricate imported bearings, and each type of bearing and all types of bearings are also different when using lubrication, which is more conducive to maximizing the service life of SKF bearings, which is the highest performance of mechanical equipment. Performance status
1. Oil lubrication:
Viscosity is an important characteristic of lubricating oil. The viscosity directly affects the fluidity of lubricating oil and the thickness of oil film formed between friction surfaces. The viscosity of lubricating oil at SKF bearing working temperature is generally 12-15cst. The higher the speed, the lower the viscosity, and the heavier the load, the higher the viscosity. Commonly used lubricating oils include mechanical oil, high-speed mechanical oil, turbine oil, compressor oil, transformer oil, cylinder oil, and the like.
Oil lubrication methods include:
a. Oil bath lubrication
Oil bath lubrication is the most common lubrication method. It is suitable for the lubrication of low and medium speed bearings. Part of the bearing is immersed in the groove. The lubricating oil is brought up by the rotating bearing parts and then flows back to the oil groove. The oil level should be slightly lower than the minimum. The center of the rolling element.
b. drip lubrication
Drip lubrication is suitable for bearing parts that need to supply lubricating oil quantitatively. The amount of dripping is generally one drop per 3-8 seconds. Excessive oil quantity will cause the bearing temperature to increase.
c. Circulating oil lubrication
The filtered oil is delivered to the bearing components by an oil pump, filtered through the lubricating oil after the bearings, and then cooled and used. Since the circulating oil can take a certain amount of heat to cool the bearing, this method is suitable for bearing parts with higher rotational speed.
d. Spray lubrication
The dry compressed air is mixed with the lubricating oil through a sprayer to form an oil mist. In the jet bearing, the air flow can effectively cool the bearing and prevent the intrusion of impurities. This method is suitable for the lubrication of high speed, high temperature bearing components.
e. Injection lubrication
The high-pressure oil is injected into the bearing through the nozzle by the oil pump, and the oil injected into the bearing flows into the oil groove through the other end of the bearing. When the bearing rotates at high speed, the rolling elements and the cage also form a gas flow at the relatively high rotation speed of the surrounding air. It is difficult to send the lubricating oil to the bearing by the general lubrication method. At this time, the lubricating oil must be sprayed by the high-pressure injection method. In the bearing, the position of the nozzle should be placed between the inner ring and the center of the cage.

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Standard method and lubrication maintenance for installing FAG spherical roller bearings

The installation of FAG spherical roller bearings should be based on the bearing structure, size and the matching properties of the bearing components. The pressure should be directly applied to the end faces of the ferrules. The pressure should not be transmitted through the rolling elements. The following methods are generally used for bearing installation. :
Thrust bearing installation
The full complement of the thrust bearing and the shaft is generally a transition fit. The fit between the race and the bearing bore is generally a clearance fit. Therefore, the bearing is easier to install. The middle shaft of the two-way thrust bearing should be fixed on the shaft to prevent relative The shaft rotates. 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.
Press fit
The inner ring of the bearing is tightly matched with the shaft. When the outer ring and the bearing housing hole are loosely fitted, the bearing can be press-fitted on the shaft first, and then the shaft is fitted into the bearing housing hole together with the bearing. On the end face of the bearing inner ring, the gasket is made of a soft metal material (copper or mild steel). The inner diameter of the assembly sleeve should be slightly larger than the diameter of the journal. The diameter of the outer diameter should be slightly smaller than the inner ring of the bearing to avoid Press on the cage.
Second, cleaning bearings and related parts
For grease-lubricated FAG spherical roller bearings and double-sided oil seals or dust caps, seal bearings do not need to be cleaned before installation. Check the size and finishing of the relevant parts.
1, grease lubrication
Relubrication of FAG spherical roller bearings is best carried out during planned equipment downtime and is periodically replenished, while removing old grease or extruding old grease through the drain. Wipe the grease fittings clean before adding fresh grease. If the bearing housing does not have a grease fitting, the bearing housing cover or end cap should be opened to remove the old grease and, after cleaning, replenish the same type of fresh grease.
2, lubricating oil lubrication
Regularly check the oil level and oil quality of the lubricating oil. Under normal circumstances, the normal oil level should be within the range of 1/3-2/3 of the equipment oil level window or mark. The oil filling method is oil cup, the oil level shown only represents the oil replenishing capacity, and the bearing tank oil level is to meet the operation requirements. The oil level in the oil cup is less than 1/4 of its total volume.

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