In order to ensure the normal operation of the NTN bearing, we need to regularly check the oil level and oil quality of the lubricating oil. Under normal circumstances, the normal oil level should be within the range of 1/3-2/3 of the oil level window or the marked oil level. The oil filling method is oil cup, the oil level shown only represents the oil replenishing capacity, and the bearing tank oil level is to meet the operation requirements. The oil level in the oil cup is less than 1/4 of its total volume.
1. Low temperature high speed bearing grease
At present, the equipment using thrust ball bearings is becoming more and more refined, and the grease used for bearings must have the following properties:
(1) It has the same operating life as the bearing, prolongs the maintenance cycle, shortens downtime and improves labor productivity.
(2) Under the high speed of dn>5×105, it is necessary to ensure that the motor temperature rises low and does not lick oil, thus reducing power consumption and protecting the motor.
(3) The impurity content is controlled under certain standards to minimize the pollution of equipment noise to the environment.
(4) Guarantee the flexibility of starting and running the bearing under ultra-low temperature working conditions to ensure the minimum output power.
2, general low noise motor bearing grease
In the NTN bearing industry, this grease is used in the largest amount, accounting for about 70% of the total grease. Because this type of grease uses a soft, easy-to-filter lithium soap as a thickening agent, using mineral oil as a base oil, it is easy to meet the requirements of low- and medium-speed thrust ball bearings to reduce the vibration value. Another advantage is that it has good pumpability, whether it is mechanical fatliquoring or manual grease application.
3, high temperature long life low noise bearing grease
Greases used in high temperature and high speed environments should have the following characteristics:
(1) It does not lose at high temperature, that is, maintains a certain consistency at a temperature of about 180 ° C, and does not soften.
(2) Less grease leakage. When the grease is subjected to high-frequency repeated shearing and large centrifugal force in the bearing, the lubrication can be recirculated to the raceway in time.
(3) It has a certain mute effect. Because the fiber of high-temperature grease is generally hard, the mute performance in the thrust ball bearing noise test is far less than that of lithium-based grease.
(4) These greases must have a certain high temperature service life and have good oxidation resistance at high temperatures, thus prolonging the life of NTN bearings and related equipment.
Use an oil bath type lubrication system. If the oil temperature is below 60 ° C (140 ° F) and the lubricant is not contaminated, replace the lubricant once a year. If the oil temperature is between 60-100 ° C (140-210 ° F), the lubricant needs to be replaced four times a year. If the oil temperature is between 100 and 120 ° C (210-250 ° F), the lubricant needs to be replaced once a month. If the oil temperature is above 120 ° C (250 ° F), the lubricant needs to be replaced once a week.
Proper installation and maintenance are important factors in the normal operation of NTN bearings. At the same time, care must be taken to maintain the cleanliness of the thrust ball bearings. Bearings must be protected from contaminants and moisture and must be properly installed and lubricated. In addition, the design of the bearing arrangement, the condition of the oil seal, the form of the lubricant and the replacement cycle and the special maintenance also play an important role and must be paid attention to.
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