Bearings should not be over-greased
author: Ann
2025-01-06
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 deposits, prevent metal wear debris and oil from agglomerating, and improve mechanical wear resistance, pressure resistance and corrosion resistance.
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 wasteful, but also harmful. The higher the speed of the bearing, the greater the harm. The more grease is filled, the greater the friction torque. For the same filling amount, the friction torque of the sealed bearing is greater than that of the open bearing. 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.
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 wasteful, but also harmful. The higher the speed of the bearing, the greater the harm. The more grease is filled, the greater the friction torque. For the same filling amount, the friction torque of the sealed bearing is greater than that of the open bearing. 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.
With the increase of grease filling, the temperature rise of the bearing increases linearly. For the same filling amount, the temperature rise of the sealed bearing is higher than that of the open bearing.
It is generally believed that the amount of grease filled in a sealed rolling bearing should not exceed about 50% of the internal space. Shawki and Mokhtar's experiments showed that 20% to 30% is the most suitable for ball bearings.
It is generally believed that the amount of grease filled in a sealed rolling bearing should not exceed about 50% of the internal space. Shawki and Mokhtar's experiments showed that 20% to 30% is the most suitable for ball bearings.
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