For sealed bearings, appropriate grease has been filled during production; For open bearings, a sealing device is also set in the main engine to prevent grease leakage. There is a question of how much grease to inject into the bearing.What Effect Does the Grease Injection Amount of the Bearing have on the Use of the Bearing
Too little grease injection is easy to cause lack of grease or dry friction and affect service life. Excessive grease injection will cause the bearing temperature to rise.
The massive leakage of lubricating grease not only pollutes the environment, but also causes waste. It can be seen that the amount of grease injected into the bearing is the less the better on the premise of ensuring the full lubrication of the bearing.What Effect Does the Grease Injection Amount of the Bearing have on the Use of the Bearing
What Effect Does the Grease Injection Amount of the Bearing have on the Use of the Bearing
We know that grease has good adhesion, wear resistance, temperature resistance, rust resistance and lubricity. It can improve high-temperature oxidation resistance, delay aging, dissolve carbon deposition, prevent the agglomeration of metal wear debris and oil, and improve the wear resistance, pressure resistance and corrosion resistance of machinery.What Effect Does the Grease Injection Amount of the Bearing have on the Use of the Bearing
After understanding the movement process of grease in the bearing, we will naturally come to a conclusion: there should not be too much grease in the bearing. Too much grease is not only a waste, but also harmful. The higher the speed of the bearing, the greater the harm.What Effect Does the Grease Injection Amount of the Bearing have on the Use of the Bearing
The more grease is filled, the greater the friction torque. With the same filling amount, the friction torque of sealed bearing is greater than that of open bearing. After the grease filling amount is equivalent to 60% of the internal space volume of the bearing, the friction torque will no longer increase significantly. What Effect Does the Grease Injection Amount of the Bearing have on the Use of the Bearing
This is because most of the grease in the open bearing has been extruded and the grease in the sealed bearing has leaked.
With the increase of grease filling amount, the bearing temperature rise increases linearly. At the same filling amount, the temperature rise of sealed bearing is higher than that of open bearing.What Effect Does the Grease Injection Amount of the Bearing have on the Use of the Bearing
It is generally believed that the grease filling amount of sealed rolling bearings shall not exceed about 50% of the internal space. The tests of shawki and Mokhtar show that 20% to 30% is suitable for ball bearings.What Effect Does the Grease Injection Amount of the Bearing have on the Use of the Bearing
Bearing sealing device
Sealing is to maintain good internal lubrication, prevent cooling water, iron oxide scale and impurities from immersing into the working surface, and prolong the service life of the bearing.
Due to the sealing problem of high-temperature roller bearing, the most damaged part of the bearing is the part close to the side of the roller body. The bearing is often due to the pollution and loss of lubricating grease, which makes the working surface of parts wear, peel off or even break, making the lubricating grease fail faster.
RBR seal ring: This is a special rubber lip seal ring for rolling mill bearing, which has been widely used in recent years. The RBR sealing ring adopts the axial sealing method, and its lip is attached to the base surface of the gland, which is not affected by the roll runout.
The old grease inside the bearing can overflow, and the external cooling water, iron oxide scale and impurities are prevented from entering by the lip, which has a good sealing effect. Moreover, it is easy to use. When changing the roll, the roll is installed into the bearing seat without any influence.What Effect Does the Grease Injection Amount of the Bearing have on the Use of the Bearing
How to extend bearing life and / or performance?
First of all, lubrication is the key. Select appropriate lubrication system and high-quality lubricant. The lubricating oil film separates the oil film surfaces in contact with each other due to load and provides the necessary protection against corrosion and wear. Therefore, the lubricating oil film is indispensable for normal operation of all rotating or reciprocating parts, especially bearings and gears.
In case of splash lubrication or circulating lubrication system, the oil film can also transfer heat. Factories often have unnecessary shutdown and deterioration of equipment status due to improper lubrication.
Insufficient oil supply will lead to increased wear and temperature rise, resulting in excessive wear and / or early bearing failure and damage. Excessive lubrication, especially for high-speed equipment, will generate too much heat due to oil agitation, which will lead to chemical deterioration of lubricating oil and bearing damage.
Proper lubrication and regular maintenance can avoid bearing damage caused by lubrication problems. Ensure reasonable lubrication:What Effect Does the Grease Injection Amount of the Bearing have on the Use of the Bearing
follow the instructions set by the equipment manufacturer for each equipment;
when adding grease, it should be filled between the bearing rolling parts and the shell (or retainer) to ensure that sufficient grease enters and the key raceway surface is fully lubricated;
Secondly, if the bearing performance needs to be improved, reasonable adjustment is very important. During assembly or installation, if the internal clearance of the bearing is too large or too small, or in some cases, the preload is too high, it may lead to early damage and shortened bearing life.
In addition to shutdown and expensive maintenance, improper bearing assembly and installation may have more negative effects, such as affecting the operation of other parts and shortening their service life.
Assembly, installation and regular maintenance according to the equipment manufacturer’s manual is a good way to prevent problems. If the time is tight, push the adjusting device forward or remove the gasket to correct the loose conical rolling bearing set.