NTN bearing lubrication 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 of the thrust ball bearing 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.
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.
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