But is it correct to use grease indefinitely to lubricate the bearings? When and how much fat should I change? These are complex problems of bearing maintenance technology.
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 the aggregation of metal wear debris and oil, and improve the wear resistance, pressure resistance and corrosion resistance of machinery. However, 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. This is because most of the grease in the open bearing has been extruded and the grease in the sealed bearing has leaked.
At the same filling amount, the temperature rise of sealed bearing is higher than that of open bearing. It is generally believed that the grease filling amount of sealed rolling bearings shall not exceed about 50% of the internal space.
The equipment supplier has formulated relevant lubrication plans before the equipment leaves the factory and learned through many commissioning tests. However, during actual operation, it is very common for staff to change lubricating oil for a short time, and more lubricating grease is often added.