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Bearing Lubrication and Bearing Service Life

Time:2020.11.19  Source:Roller Bearings Suppliers

Bearing Lubrication and Bearing Service Life


Bearing as the "joint" parts of mechanical equipment, its service life and work efficiency are very important to the machinery, then we in the use of the bearing process, should pay attention to the lubrication of the bearing a little more, or should we pay more attention to the service life of the bearing?In fact, bearing lubrication has a great relationship with the service life of bearings.


What conditions have bearing life to do with them?There are mainly the following points:

1. Load size and life

Bearing by the size of the load on the bearing life is very large, you had better look at the choice of the bearing's basic rated load.Avoid bearing fatigue damage caused by the actual load exceeding the bearing load.Otherwise, the bearing will not be durable, frequent replacement of the bearing phenomenon.As a tip, a halving of the load on ball bearings will extend their service life by eight times, and roller bearings will extend their service life by ten.


2. Bearing clearance and service life

In general, the internal clearance of a rolling bearing in operation will be reduced due to the heat generated inside the bearing and the heat released around the bearing, and the temperature of the inner ring is higher than that of the outer ring.Clearance and bearing life must be taken into account.Because it is difficult to know the temperature difference during operation, positive clearance is usually used for safety.Need WSBC 22216-E1,click here to learn more.

WSBC 22216-E1.jpg

3. Tilt and life

Tilt here refers to the shaft tilt during the installation process caused by the two ends of the shaft parallelism adjustment is not in place or not adjusted.The uneven distribution of the force applied to the bearing results in the reduction of bearing life. The greater the tilt, the greater the reduction, and the shorter the service time.Of course, with the exception of self-aligning bearings, there is no such problem.


4. material purity and life

In addition to the service conditions, the failure of bearing parts is mainly restricted by the hardness, strength, toughness, wear resistance, corrosion resistance and internal stress state of the steel.The main internal factors affecting these properties and states are:(1) Martensite in hardened steel;(2)Residual austenite in quenched steel;(3) Undissolved carbide in quenched steel;(4) Residual stress after quenching and tempering;The impurity content of steel.In the case of good lubrication conditions, are generally internal starting point type stripping.Therefore, the inner purity of the material has a great impact on the life, which cannot be controlled by the user. What we can do is to select the genuine bearings of big brands.


5. Environment and life

The influence of foreign matter, impurity and water on the bearing life is also very great, the more intrusions, the lower the bearing life.


6. Lubrication and life

Factors related to oil film formation: bearing size, surface finish, speed, load,temperature, viscosity coefficient of oil.


The above factors have a close relationship with the bearing life, but it can be seen that lubrication plays the most critical role in the service life of the bearing, the lack of lubrication, or the choice of improper lubrication will directly lead to the use efficiency of the bearing, resulting in bearing failure.

Protect bearings (from corrosion and external impurities)


(1) Reduce friction and friction damage.

Prevent the bearing ring, rolling body and the retainer contact each other, reduce friction, wear.Click here to learn more about WSBC 22222 EK.

WSBC 22222 EK C3.jpg

(2) Prolong fatigue life.

The rolling fatigue life of the bearing is prolonged when the contact surface is well lubricated during rotation.On the contrary, the oil viscosity is low, the oil film thickness is not good, it is shortened.


(3) Discharge friction heat and cooling.

The circulating oil method can cool the heat generated by friction, or the heat transmitted from the outside, to prevent the bearing from overheating and prevent the lubricating oil from aging itself.


(4) Others

Also have to prevent foreign matter into the bearing interior, or prevent rust, corrosion effect.


Lubrication is essential for the use of bearings.Generally speaking, bearing lubrication can be classified as oil lubrication and grease lubrication.

Grease is a familiar lubricant which is widely used.Lubricating greases of various types, including sodium base, calcium base, lithium base, barium base, aluminum base and so on, are used in daily mechanical repair to ensure the normal operation of all operating parts of the equipment.For example, butter, as it is known, has a yellow appearance, and pig suet is a calcium based grease.


Compared with lubricating oil lubrication, grease lubrication does not require complex lubricating devices (oil tanks, pumps, cooling devices) and USES less grease, so it is widely used.That is, grease lubrication has the advantages of easy to use, low cost and so on.In particular, 80% of rolling bearings are lubricated with grease.


In order to make the bearing function well, the first choice is suitable for the use of conditions, the purpose of lubrication.If lubrication is considered only, the lubricity of oil lubrication is dominant, but grease lubrication has the advantage of simplifying the structure around the bearing.


For actual mechanical application, the bearing life relations is not very big, and poor lubrication bearing is the most critical, for as long as possible in good condition to maintain the performance of the bearing was must often maintenance, repair, in order to prevent the fault development, to ensure reliability of the operation, to improve the productivity and economy.Maintenance it is best to establish the corresponding mechanical operating conditions of the standard work, to monitor the bearing running status, bearing rotation sound, vibration, temperature, lubricant status......And so on.


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