Regular lubrication and maintenance methods used in different applications of NTN thrust ball bearings

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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Anatomy of the basic steps of maintenance and overhaul of ntn joint bearings

Maintenance and maintenance of ntn bearings ensure the reliability of operation, improve productivity and economy, prevent accidents, ensure operational reliability, improve productivity and economy, and ensure that joint bearings are good for a long time. The state maintains its original performance.

Cleaning of bearings: Gasoline and kerosene are commonly used as ordinary cleaning agents. When disassembling the ntn bearing for inspection, first record the appearance of the bearing, confirm the residual amount of the lubricant, and start the washing of the joint bearing after sampling the lubricant for inspection. The cleaning is divided into coarse cleaning and fine cleaning, respectively, placed in the container, first placed on the bottom of the metal mesh, so that the bearing does not directly contact the container of dirt.

1. In the process of using bearings, regular cleaning is very important. How to clean the bearings accurately? When the joint bearing is first removed for inspection, first use the method of photography to make a good appearance record. Also, verify the amount of lubricant remaining and sample the lubricant before cleaning the bearings.

2. The cleaning of the ntn bearing is divided into rough washing and fine washing, and the metal mesh frame can be placed on the bottom of the used container.

3. When rough washing, clean the grease or adhesive with a brush on the top of the oil. At this time, if the joint bearing is transferred in the oil, the rolling surface is damaged by the foreign matter.

4. When fine washing, slowly shifting the bearing in the oil, it must be forced to stop.

5. The cleaning agent used on weekdays is neutral non-aqueous diesel or petroleum, and sometimes uses warm alkaline liquid according to demand. Regardless of which cleaning agent is used, it is often necessary to filter and clean the cockroach.

6. Immediately after cleaning, apply anti-rust oil or anti-rust grease to the joint bearing.

Inspection and judgment of ntn bearing: In order to judge whether the removed bearing can be used, it should be checked after the bearing is cleaned.

The inspection contents include: monitoring the operating status, replenishing and replacing the lubricant, and checking the periodic disassembly. This is the operating standard for maintaining the best mechanical operating conditions and is carried out regularly. As a maintenance item during operation, there are rotating sound, vibration, temperature, and lubricant status, and separate bearings such as joint bearings can be inspected for the rolling surfaces of the rolling elements and the outer ring.

Check the condition of the raceway surface, the rolling surface, the mating surface, the wear of the cage, the increase of the ntn bearing clearance, and the damage abnormality with irrelevant dimensional accuracy. For non-separable miniature ball bearings, use one hand to support the inner ring horizontally, and rotate the outer ring to confirm whether the large bearing cannot be rotated by hand. Pay attention to the appearance of the rolling element, raceway surface, cage, rib surface, etc. The higher the importance of the bearing, the more careful it is necessary to check.

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