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Advantages and disadvantages of 7 methods of bearing lubrication

Advantages and disadvantages of 7 methods of bearing lubrication

2020-04-21

Good equipment lubrication is an effective way to reduce equipment wear, improve equipment efficiency, and save materials and energy.The lubrication of the bearing is to make the bearing run normally, avoid direct contact between the raceway and the surface of the rolling body, reduce the friction and wear inside the bearing, extend the service life of the bearing, and improve the performance of the bearing.Bearings and prevent foreign bodies from entering the bearings.The interior can cause rust and corrosion. 

This paper introduces the role of bearing lubrication, common lubrication methods, advantages and disadvantages and use range, reasonable, correct lubrication, in order to maximize the performance of the bearing, extend the service life.

The oil cup drips oil to lubricate

Oil drop lubrication is a method of lubrication, through the oil - saving mouth in the oil cup lubrication bearing oil drop.

Advantages: simple structure, easy to use, oil saving.In addition, fuel - saving ports can be used to regulate the amount of oil supplied.Usually, the amount of oil to drop is preferably one drop every 3 to 8 seconds, because too much oil will cause the bearing temperature to rise.

Disadvantages: there are certain requirements for the viscosity of lubricating oil.It is impossible to use lubricants with high viscosity and no heat dissipation.

Scope of application: drip lubrication of oil cup is suitable for low speed and light load condition.

2. Oil bath (dip in oil) for lubrication

A method of lubrication in which the bearing part is immersed in lubricating oil and the oil is carried into other parts of the bearing after the bearing operation.Oil bath lubrication is one of the most common and simple lubrication methods.3018-2rs bearing bearing model query 3018-2z bearing bearing model query 3218 bearing

Considering the mixing loss and temperature increase in the process of oil bath lubrication, the horizontal part of the bearing shall enter the lubricating oil with a certain height limit.Normally, the oil level is controlled near the center of the rolling element at the bottom of the bearing.The oil bath is lubricated and fully lubricated, but the oil supply is not easily adjusted.If there is no filter in the fuel tank, it is easy to introduce impurities into the bearing and damage the bearing.

Application: oil bath (immersion) lubrication is usually suitable for low or medium speed applications, usually for low speed bearings.

Experience: detachable ribs can be installed at the bottom of the shell to reduce agitation and/or heat dissipation.The static oil level shall be slightly below the center of the lowest rolling element of the bearing applied to the horizontal shaft.For the vertical axis, the static oil level should cover 50%-80% of the rolling element.If the bearing temperature is higher using the oil bath system, the use of drip irrigation, splashing or circulating oil system can be changed.

3. Splash lubrication

A method of lubrication by which oil is carried into a bearing through other running parts.Splash oil supply is not easy to adjust, the oil level should not be too high, otherwise it will easily cause mixing loss and temperature rise, and it is easy to bring impurities into the tank bearing bearing damage.

In splash lubrication, oil is splashed onto the bearing through a rotating body (impeller or "oil throw ring") mounted on the shaft and the bearing is not immersed in the oil.

Experience: in the gearbox, the gears and bearings usually share a tank with the gears as the oil throwing ring.Since the viscosity of the gear oil may differ from the bearing requirements and the oil contains wear particles from the gear, separable lubrication systems or methods can be used to improve the bearing life.

4. Circulating oil lubrication

After the oil is inhaled from the fuel tank, it is transported to the bearing to be lubricated, and then returned to the fuel tank from the oil return port, filtered and reused.The oil supply system consists of oil pump, cooler, filter, fuel tank and pipeline.Circulating oil is well lubricated, oil supply is easy to control, heat dissipation and impurity removal ability is strong.Circulating oil lubrication is an ideal way of lubrication.However, independent fuel supply systems are required and manufacturing costs are relatively high.Bearing model query 3218-2rs bearing bearing model query 3218-2z bearing bearing bearing model query 3318 bearing bearing model query 3318-2rs bearing bearing model query

Circulating oil lubrication can be divided into injection lubrication, forced lubrication and spray lubrication.They are divided into different angles.

Scope of application: circulating oil lubrication is suitable for heat dissipation, impurities, high speed, high temperature, heavy load, high reliability occasions.

5. Oil mist lubrication

The lubricating oil is mixed in the mist generator by using compressed air and a small amount of lubricating oil to form a mist, which is then sent to the lubricated part of the bearing lubrication part.Oil mist lubrication mixing loss and temperature rise is small, fuel saving, less impurities in the oil, the air flow produced by oil mist spray has a certain cooling effect, but also can effectively prevent the invasion of impurities or impurities.However, the cost of lubrication device is relatively high, the viscosity of the oil has certain requirements, generally should not be higher than 340 mm 2 / s, otherwise the atomization effect will not be achieved.In addition, if the seal is not tight during lubrication, some oil mist may escape into the air to pollute the environment.If necessary, an oil separator should be used to collect oil mist.

Application: oil mist lubrication is suitable for high speed applications.

6. Injection lubrication

The high pressure injection method is used to lubricate bearings by injecting lubricating oil into them.When the bearing is running at high speed, the rolling element and cage also rotate at a relatively high speed, thus forming an air vortex around the bearing.If the general lubrication method is used, the lubricating oil will not easily reach the lubricating part.On the other hand, due to the centrifugal force generated at high speed, it is difficult to keep the lubricating oil in the lubricating part.

In order to ensure a sufficient supply of lubricating oil to the high speed bearings, a forced injection of lubricating oil from one end of the bearing is necessary for lubrication and then reintroduction into the tank from the other end.The lubrication system shall be designed so that the high-pressure nozzle is located between the inner ring and the center of the cage and the lubricant is tilted outward by centrifugation.

In order to effectively lubricate the bearing, the injection rate of the lubricating oil shall not be less than 15 m/s.From the point of view of running speed, injection lubrication is usually used for bearings running at high speed under low or medium loads.In the direction of bearing forces, injection lubrication is usually used for bearings on vertical or sloping shafts, and lubricants are usually injected directly into the bearings..

Oil and gas lubrication

Oil and gas lubrication is usually suitable for high bearing speed applications.A small amount of lubricating oil is mixed with a gas at a certain pressure and fed to the bearings.

Applications: this method is suitable for high speed applications, such as machine tools, and is generally used sparingly in the refining and chemical industries.


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