The importance of bearing grease filling is very important
April 11, 2019
Bearing is an important accessory in mechanical equipment. In order to make the bearing work normally, reduce bearing wear and prolong the bearing life, everyone knows that it is necessary to add grease. Therefore, it is very important to increase the amount of bearing grease. effect. But is the use of grease to infinitely lubricate the bearings? When should I change the fat and how much fat should I change? These are the complex issues of bearing maintenance technology.
Grease has a good effect on the bearing. It has good adhesion, wear resistance, temperature resistance, rust resistance and lubricity. It can improve high temperature oxidation resistance, delay aging, dissolve carbon deposits and prevent metal abrasion. Condensation with oil to improve the wear resistance, pressure resistance and corrosion resistance of the machine. However, the more the grease is filled, the greater the friction torque. With the same filling amount, the friction torque of the sealed bearing is larger than that of the open bearing. After the grease filling amount is equivalent to 60% of the internal space of the bearing, the friction torque is no longer significantly increased. This is because most of the grease in the open bearing has been extruded, and the grease in the sealed bearing has also been lost.
As the filling amount of the grease increases, the temperature rise of the bearing increases linearly, and 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 grease filling capacity of sealed rolling bearings should not exceed 50% of the internal space.
By definition, the lubrication of the bearing is planned or not. The equipment supplier has already prepared the relevant lubrication plan before leaving the factory, and it is known through various debugging tests. However, when the staff actually do exercises, it is very common to change the lubricant for a short period of time, and often more grease is added.
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