Importance Of Lubrication Of Koyo Self-Aligning Ball Bearing To Rolling Sound
Importance Of Lubrication Of Koyo Self-Aligning Ball Bearing To Rolling Sound
2022年2月28日
Ntn Thrust Ball Bearings Are Regularly Lubricated And Maintained In Different Application Environments
Ntn Thrust Ball Bearings Are Regularly Lubricated And Maintained In Different Application Environments
2022年2月28日

Regular Lubrication And Maintenance Of Adjusting Rotation Accuracy Of Ntn Tapered Roller Bearing

Ntn Tapered Roller Bearing

After the NTN bearing is installed in the main engine, if the radial runout of the tapered roller bearing spindle is measured, it can be found that Ntn Tapered Roller Bearing the measured value of each revolution has a certain change;

During continuous measurement, it can be found that this change will approximately repeat after a certain number of revolutions. The index to measure the degree of change is Ntn Tapered Roller Bearing the cyclic rotation accuracy.

The number of revolutions required for the approximate repetition of the change represents the “quasi period” of the cyclic rotation Ntn Tapered Roller Bearing accuracy. The large magnitude of the change in the quasi period is the poor cyclic rotation accuracy.

1. Grease lubrication

The relubrication of NTN bearings is carried out during the planned equipment shutdown and supplemented regularly. At the same time, the old grease is removed or squeezed out through Ntn Tapered Roller Bearing the oil drain air.

Wipe the grease nipple clean before adding fresh grease. If there is no grease nozzle in the bearing box, open the bearing box cover or end cover to take out the old grease. Ntn Tapered Roller Bearing After cleaning, add fresh grease of the same model.

Regular Lubrication And Maintenance Of Adjusting Rotation Accuracy Of Ntn Tapered Roller Bearing

2. Lubricating oil lubrication

Regularly check the oil level and quality of lubricating oil. Generally, Ntn Tapered Roller Bearing the normal oil level should be within 1 / 3-2 / 3 of the equipment oil level window or mark.

The oil replenishment mode is the oil cup, and the displayed oil level only represents the oil replenishment capacity, while the oil level of the bearing box meets the operation requirements. If the oil level in the oil cup is lower than 1 / 4 of its total volume, oil replenishment can be considered.

Check and replenish oil methods. Take a small amount of lubricating oil as a sample and compare it with fresh lubricating oil. Competent units can consider oil quality test to ensure that the oil quality is qualified. If the sample looks like a cloud, it may be the result of mixing with water, which is often called oil emulsification.

At this time, the lubricating oil Ntn Tapered Roller Bearing should be replaced. Installation of the front bearing at the fixed end on the shaft: thoroughly clean the tapered roller bearing with clean cleaning kerosene.

For grease lubrication, first inject the organic solvent containing 3% ~ 5% grease into the NTN bearing for degreasing and cleaning, and then fill the quantitative grease into the bearing with an oil gun (Accounting for 10% ~ 15% of the bearing space volume);

Heat the bearing to raise the Ntn Tapered Roller Bearing temperature by 20 ~ 30 ℃, and install the bearing into the shaft end with an oil press; Press the set sleeve on the shaft and press the bearing end face with appropriate pressure to make it axially positioned;

Roll the belt of the spring scale on the outer ring of the bearing and check whether the specified preload changes greatly by measuring the Ntn Tapered Roller Bearing starting torque (even if the tapered roller bearing is correct, the preload may also change due to the deformation of the fit or cage).

Ntn Thrust Ball Bearings Are Regularly Lubricated And Maintained In Different Application Environments

Iko Plane Bearing Noise Inspection And Maintenance

NTN bearing lubrication is implemented during the planned equipment shutdown and supplemented regularly. At the same time, the old grease is removed or squeezed out through the oil drain air.

Wipe the grease nipple clean before adding fresh grease. If there is no oil nozzle in the bearing box of thrust ball bearing, open the bearing box cover or end cover to take out the old grease. After cleaning, add fresh grease of the same model.

In order to ensure the normal operation of NTN bearing, we need to regularly check the oil level and oil quality of lubricating oil. Generally, the normal oil level should be within 1 / 3-2 / 3 of the equipment oil level window or mark.

The oil replenishment mode is the oil cup, and the displayed oil level only represents the oil replenishment capacity, while the oil level of the bearing box meets the operation requirements. If the oil level in the oil cup is lower than 1 / 4 of its total volume, oil replenishment can be considered.

1. Low temperature high speed bearing grease

At present, the equipment using thrust ball bearings is becoming more and more sophisticated, which makes the grease used in the bearings must have the following properties:

(1) It has the same operating life as the bearing, so as to prolong the maintenance cycle, shorten the shutdown time and improve the labor productivity.

(2) When DN > 5 × Under the high speed of 105, ensure the low temperature rise of the motor without oil rejection, so as to reduce power consumption and protect the motor.

(3) The impurity content is controlled under a certain standard to greatly reduce the environmental pollution caused by equipment noise.

(4) Under ultra-low temperature working conditions, ensure the flexibility of bearing starting and operation, and ensure low output power.

2. Universal low noise motor bearing grease

In the NTN bearing industry, this kind of grease is widely used, accounting for about 70% of the total grease consumption. Because this kind of grease uses lithium soap with soft fiber and easy filtration as thickener and mineral oil as base oil,

it can easily meet the requirements of reducing vibration value of medium and low-grade thrust ball bearings. Another advantage is that it has good pumping performance. Whether it is mechanical fatliquoring or manual fatliquoring, it is simple and easy.

3. High temperature long life low noise bearing grease

The grease used in high temperature and high speed environment shall have the following characteristics:

(1) No loss at high temperature, i.e. maintain a certain consistency at about 180 ℃ without softening.

(2) Less grease leakage. When the grease is subjected to high-frequency repeated shear and great centrifugal force in the bearing, the lubrication can flow back to the raceway in time without being thrown out.

(3) It has a certain mute effect. Because the fiber of high-temperature grease is generally hard, the mute performance in the noise test of thrust ball bearing is far inferior to that of lithium grease.

(4) This kind of grease should have a certain high-temperature service life and good oxidation resistance at high temperature, so as to prolong the service life of NTN bearings and related equipment.

Use the oil bath lubrication system. If the oil temperature is below 60 ℃ (140 ° f) and the lubricating oil is not polluted, replace the lubricating oil once a year. If the oil temperature is 60-100 ℃ (140-210 ° f), the lubricating oil needs to be changed four times a year.

If the oil temperature is 100-120 ℃ (210-250 ° f), the lubricating oil needs to be changed once a month. If the oil temperature is above 120 ℃ (250 ° f), the lubricating oil needs to be changed once a week.

Proper installation and maintenance is an important factor for the normal operation of NTN bearing. At the same time, attention must be paid to maintaining the cleanliness of thrust ball bearing. The bearing must be protected from contamination by pollutants and moisture, and must be correctly installed and lubricated.

In addition, the design of bearing arrangement, the condition of oil seal, the form and replacement cycle of lubricant and special maintenance also play an important role, which must be paid attention to.