How to grasp the best time for bearing oil change

Affirmative answers are not acceptable as to whether or not the grease can be used indefinitely. Because of the excessive use of grease, it is a lot of damage to the bearing.

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.

In general, the lubrication plan for bearings is based on time. Equipment suppliers typically develop lubrication plans based on operating time. Also, equipment suppliers often add guidance on the amount of lubricant during their maintenance planning. For the staff, short-term lubricant replacement is very common, and often more grease is added.

For lubricated bearings, there is a fixed concept of prevention that keeps the equipment operating properly without the bearings being shut down due to drying and collapse. However, we have to balance the need to maintain lubrication and hunger and a lot of over-lubrication. If the oil change is too small, the bearing will be scrapped in advance; if the oil is changed too much, the bearing will be in trouble or damage the power coil and winding wire for a long time.