When is the best time to change bearing oil?
author: LeiLa
2024-12-17
Maybe everyone knows that grease plays a very important role in the use of bearings. Then some people will ask, can grease be used unlimitedly to lubricate bearings? When should the oil be changed and how much oil should be changed? In fact, these problems are complex issues in the maintenance technology of imported bearings.
Regarding the question of whether grease can be used unlimitedly, the definite answer is no. Because excessive use of grease is very harmful to bearings.
Grease has a good effect on bearings. It has good adhesion, wear resistance, temperature resistance, rust resistance and lubricity. It can improve high-temperature oxidation resistance, delay aging, dissolve carbon deposits, prevent metal wear and oil from agglomerating, and improve the wear resistance, pressure resistance and corrosion resistance of machinery.
However, if the amount of grease filling is more, the friction torque is greater. With the same filling amount, the friction torque of sealed bearings is greater than that of open bearings. After the grease filling amount is equivalent to 60% of the internal space volume of the bearing, the friction torque no longer increases significantly. This is because most of the grease in the open bearing has been squeezed out, and the grease in the sealed bearing has also been lost.
As the amount of grease filling increases, the temperature rise of the bearing increases linearly. For the same amount of filling, the temperature rise of the sealed bearing is higher than that of the open bearing. It is generally believed that the amount of grease filling in a sealed rolling bearing should not exceed about 50% of the internal space.
Generally speaking, the lubrication plan of the bearing is determined according to time. Equipment suppliers usually formulate lubrication plans based on operating time. In addition, equipment suppliers often add guidance on the amount of lubricant in their maintenance plan. It is very common for staff to change lubricants in a short period of time, and often too much grease is added.
For lubricated bearings, there is a fixed prevention concept, which is to keep the equipment running reasonably under the condition that the bearing does not stop running due to drying and collapse. However, we must also maintain a balance between lubrication hunger and excessive over-lubrication. If the oil is changed too little, the bearing will be scrapped prematurely; if the oil is changed too much, the bearing will be in trouble or harm the power coil and winding for a long time.
Regarding the question of whether grease can be used unlimitedly, the definite answer is no. Because excessive use of grease is very harmful to bearings.
Grease has a good effect on bearings. It has good adhesion, wear resistance, temperature resistance, rust resistance and lubricity. It can improve high-temperature oxidation resistance, delay aging, dissolve carbon deposits, prevent metal wear and oil from agglomerating, and improve the wear resistance, pressure resistance and corrosion resistance of machinery.
However, if the amount of grease filling is more, the friction torque is greater. With the same filling amount, the friction torque of sealed bearings is greater than that of open bearings. After the grease filling amount is equivalent to 60% of the internal space volume of the bearing, the friction torque no longer increases significantly. This is because most of the grease in the open bearing has been squeezed out, and the grease in the sealed bearing has also been lost.
As the amount of grease filling increases, the temperature rise of the bearing increases linearly. For the same amount of filling, the temperature rise of the sealed bearing is higher than that of the open bearing. It is generally believed that the amount of grease filling in a sealed rolling bearing should not exceed about 50% of the internal space.
Generally speaking, the lubrication plan of the bearing is determined according to time. Equipment suppliers usually formulate lubrication plans based on operating time. In addition, equipment suppliers often add guidance on the amount of lubricant in their maintenance plan. It is very common for staff to change lubricants in a short period of time, and often too much grease is added.
For lubricated bearings, there is a fixed prevention concept, which is to keep the equipment running reasonably under the condition that the bearing does not stop running due to drying and collapse. However, we must also maintain a balance between lubrication hunger and excessive over-lubrication. If the oil is changed too little, the bearing will be scrapped prematurely; if the oil is changed too much, the bearing will be in trouble or harm the power coil and winding for a long time.
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