Comparison of grease lubrication and oil lubrication in rolling FAG bearings

The advantages of rolling FAG bearings with lubricating oil are:

1) Under certain operating specifications, the starting torque and friction loss of lubricating oil is significantly smaller than that of lubricating grease.

2) Since the lubricating oil takes away heat in the circulation to cool, it can make the FAG bearing reach a relatively high rotational speed.

3) It can guarantee a relatively high operating temperature.

4) When changing the grease, the relevant connecting parts must be disassembled, and when it is lubricated with oil, there is no such trouble.

5) The FAG bearing in the reduction gearbox is very suitable when lubricating with lubricating oil, because the oil simultaneously achieves the purpose of lubricating the gear and the FAG bearing at the same time in a splash manner. 6) In FAG bearings, grease is gradually contaminated by product wear products, abrasives, products that penetrate from the outside through the sealing device and aging products. If not replaced in time, it will cause accelerated wear of FAG bearings, and when using liquid lubricants It can be filtered to ensure its normal operation.

Advantages of rolling grease for FAG bearings:

1) Individual FAG bearing points must be refueled by hand. If the grease is used, it will save trouble and avoid accidents caused by lack of oil.

2) The grease itself has a sealing effect, which allows the use of a mechanism with a low degree of sealing to achieve a simplified design.

3) Experience has shown that in a certain speed range (n < 20000r / min or dn < 20000mm.r / min) with lithium grease lubrication has a lower temperature rise and a longer FAG bearing life than the drop method.

2. Rolling FAG bearing lubrication theory foundation: The lubrication mechanism of rolling FAG bearing belongs to the theory of elastic fluid dynamic pressure lubrication.

3, rolling FAG bearing failure type and lubrication relationship: most of the failure is due to assembly problems, poor sealing and damage. A small number of failures are caused by wear, gluing, corrosion and overheating due to lack or excess of lubricant or quality failure.

4. Basic characteristics of grease and general criteria for selecting grease:

When selecting grease, it is necessary to select the grease that is compatible with the conditions of use (temperature, speed, load, environment, etc.), which are related to the basic characteristics of the grease, and the basic characteristics of the grease depend on the thickener and base oil. kind of.

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