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.

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The importance of using deep groove ball bearing grease for stability

1, anti-rust performance
The rust preventive agent is preferably insoluble in water, has good adhesion, and can form an oil film on the surface of the steel.
2, mechanical stability
If the mechanical stability of the grease is insufficient, during the operation, the structure of the soap of the grease will mechanically disintegrate, causing the grease to be destroyed, thereby losing the lubricating effect.
3, oil seal
Oil seals are necessary to protect deep groove ball bearings and lubricants from external contamination. During the operation of TIMKEN bearings, no matter whether debris or moisture can penetrate into TIMKEN bearings to prevent damage.
4, mixed grease
Do not mix incompatible greases. If two incompatible greases are mixed, the consistency will usually become soft. Finally, the TIMKEN bearing may be damaged due to the easy loss of grease.
5, the classification of oil
The consistency and lubricity of grease are affected by the operating temperature. TIMKEN bearings operating at a certain temperature must select greases with the correct consistency and good lubrication at the same temperature.
In general, the amount of grease filled in deep groove ball bearings always exceeds the actual required amount of direct participation in lubrication, in the cavity on the frame and in the bearing cover, and forms a contour on the periphery of the rolling element. During this process, the bearing temperature rises rapidly due to the resistance of the excess grease. Although most of the excess grease is squeezed out at the beginning of the run, the grease that is squeezed into the raceway attachment may still be carried by the rolling element into the raceway. In the early stages of the bearing, most of the grease is squeezed out of the raceway very quickly (less than a minute), and the build-up grease is discharged a small amount while circulating along with the bearing rotor. At this time, the bearing temperature continues to rise until the excess bearing grease is completely discharged, which can be called the running phase of the grease. According to the grease quality and filling amount in the TIMKEN bearing structure, this time may last for more than ten. Minutes, even hours.

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