Lubrication and sealing are very important to any self-aligning ball bearing. Good lubrication and sealing are important to the service life of the bearing. Today, we will focus on the importance of Koyo Self-Aligning Ball Bearing lubrication and sealing of Koyo bearing.
In daily use, many people do not pay attention to the lubrication of self-aligning ball bearings. They believe that lubrication has little effect on bearings. However, this often leads to the reduction of bearing life. Koyo Self-Aligning Ball Bearing What good is the lubrication of Koyo bearings for us?
a. Oil bath lubrication oil bath lubrication is a common lubrication method, which is suitable for the lubrication of low and medium Koyo Self-Aligning Ball Bearing speed bearings. Part of the self-aligning ball bearing is immersed in the groove,
and the lubricating oil is brought up by the rotating bearing parts and then flows back to the oil groove. Koyo Self-Aligning Ball Bearing The oil level should be slightly lower than the center of the low rolling element.
b. Oil dripping lubrication oil dripping lubrication is suitable for bearing components requiring quantitative supply of lubricating oil. The amount of oil dripping is Koyo Self-Aligning Ball Bearing generally one drop every 3-8 seconds. Excessive amount of oil will cause Koyo bearing temperature to increase.
transmits the filtered oil to the self-aligning ball bearing parts, and the lubricating oil after passing through the bearing is filtered and cooled Koyo Self-Aligning Ball Bearing before use. Since the circulating oil can take away some heat and cool the Koyo bearing, this method is applicable to the bearing parts with high speed.
D. spray lubrication is used to compress the dry compressed air by spray with lubricating oil to form oil mist. In the jet bearing, the airflow can effectively cool the bearing and prevent impurities from invading. This method is suitable for the lubrication of high-speed and high-temperature self-aligning ball bearing components.
e. The high-pressure oil is injected into the bearing through the nozzle by the oil pump for jet lubrication, and the oil injected into the Koyo bearing flows into the oil groove through the other end of the bearing. When the bearing rotates at a high speed, the rolling element and cage also form airflow in the surrounding air at a fairly high rotation speed.
It is difficult to send the lubricating oil to the bearing by general Koyo Self-Aligning Ball Bearing lubrication methods. At this time, the lubricating oil must be sprayed into the self-aligning ball bearing by high-pressure injection. The position of the nozzle should be placed between the inner ring and the center of the cage.
Since the temperature is affected by lubrication, speed, load and environment, the value in the table only represents the approximate temperature range. The function of bearing lubrication lubrication has an important impact on the fatigue life, friction, wear, temperature rise and vibration of Koyo bearing.
Without normal lubrication, the self-aligning ball bearing can not work. The analysis of the causes of bearing damage shows that about 40% of bearing damage is related to poor lubrication. Therefore, good Koyo Self-Aligning Ball Bearing bearing lubrication is an effective measure to reduce bearing friction and wear.
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 Koyo Self-Aligning Ball Bearing the measured value of each revolution has a certain change;
During continuous measurement, it can be found that this change will Koyo Self-Aligning Ball Bearing approximately repeat after a certain number of revolutions. The index to measure the degree of change is the cyclic rotation accuracy.
The number of revolutions required for the approximate repetition of the change represents the “quasi period” of the cyclic rotation Koyo Self-Aligning Ball 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 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. After cleaning, add fresh grease of the same model.
2. Lubricating oil lubrication
Regularly check the oil level and 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.
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 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 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 starting torque (even if the tapered roller bearing is correct, the preload may also change due to the deformation of the fit or cage).