NTN thrust ball bearing grease selection needs to pay attention to six factors

The choice of NTN thrust ball bearing grease is directly related to the stable operation of the equipment. In order to better play the best condition of NTN thrust ball bearing, the following are several important factors for selecting grease: mechanical type; NTN thrust ball bearing Type and size; working temperature; workload situation; speed range; working conditions, such as vibration and the direction of the main shaft is horizontal or vertical; cooling; sealing effect;

1, anti-rust performance

The grease used in NTN thrust ball bearings must have an anti-rust effect, and the anti-rust agent should preferably be insoluble in water. Grease should have good adhesion and form an oil film on the surface of the steel.

2, mechanical stability

Grease becomes soft during machining and causes leakage. During normal operation, the grease will be raked into the NTN thrust ball bearing by the NTN thrust ball bearing housing. 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 seal is a necessary barrier to protect NTN thrust ball bearings and lubricants from external contamination. During the operation of NTN thrust ball bearings, no matter whether debris or moisture can penetrate into NTN thrust ball bearings to prevent damage. Proper installation and maintenance is an important factor in maximizing the service life of NTN thrust ball bearings. At the same time, attention must be paid to the cleanliness of NTN thrust ball bearings, the correctness of NTN thrust ball bearing selection, and the selection of appropriate installation and maintenance tools. In addition, NTN thrust ball bearings must be protected from contaminants and moisture and ensure proper installation and lubrication. Therefore, the design of the NTN thrust ball bearing, the condition of the oil seal, the type of lubricant and the lubrication cycle, and even the special maintenance play the same and important role.

4, mixed grease

Never mix incompatible greases. If two incompatible greases are mixed, the consistency will usually become soft. Finally, the NTN thrust ball bearings may be damaged due to the easy loss of grease. If you don't know which type of grease was originally used in NTN thrust ball bearings, you must completely remove the old grease inside and outside the NTN thrust ball bearings before adding new grease.

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Correct use of TIMKEN cylindrical roller bearing grease

Proper use of grease must be aware of the movement of grease in TIMKEN cylindrical roller bearings. Guarantee the stability of the grease. The movement of the grease filled in the rolling bearing can be roughly divided into two stages with the rotation of the TIMKEN cylindrical roller bearing.

In general, the amount of grease in the TIMKEN cylindrical roller bearing always exceeds the actual amount of lubrication directly involved in the lubrication, on the frame and in the cavity of 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 initial stage of bearing operation, most of the grease is squeezed out of the raceway very quickly (less than one minute), and the grease is accumulated in a small amount while being circulated with the TIMKEN cylindrical roller bearing rotating body. discharge. At this time, the bearing temperature will continue to rise until the excess grease is completely discharged. It can be called the grease's walking phase. According to the grease quality and filling amount in the bearing structure, this time may last for ten minutes. Even a few hours.

After the remaining grease is completely discharged, the remaining small amount of grease forms a thin layer of grease film on the mutual contact surface of the rolling element, the raceway and the cage, thereby entering the normal operation stage of the bearing. . At this time, the temperature gradually drops and reaches equilibrium. In other words, long-term lubrication is mainly borne by this layer of grease film. In addition, during the long-term operation of the bearing, the contour of the rolling element and the raceway and the grease on the cage are shrunk to separate a part of the base oil, and after flowing into the raceway, the lubrication is also supplemented. .

Different greases are different in the contours of TIMKEN cylindrical roller bearings. It is necessary to form a contour that is relatively straightforward. The running time is short. In the long-term operation, the bearing temperature is low and stable. This is a kind of It is an ideal grease, so it is especially important for the grease.

Some so-called eddy-flow greases are not easy to form contours, and even if they are contoured, they are easy to collapse. At this time, the excess grease repeatedly returned to the raceway is in a state of being strongly stirred for a long time, and the torque of the TIMKEN cylindrical roller bearing is large. The temperature is high and unbalanced, and noise may also be generated, and the grease is also prone to deterioration and loss.

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