Why is there no oil hole at the bearing of the electric motor?

Why is there no oil hole at the bearing of the electric motor?

Most motor bearings are rolling bearings, with various forms of ball bearings between the Geneva and outer bearings. Round beads, cylinders, wedge-shaped columns, 

arranged in single or double rows. Reduce friction by rolling. No need to constantly add oil to the oil hole, just apply lubricating oil within a certain period of time to meet 

the requirements. Moreover, it mostly belongs to dry oil lubrication and does not require the presence of oil injection holes.

Sliding bearings are separated by an oil film between the inner and outer bearings, resulting in friction and strong load-bearing capacity. They are divided into static pre-

ssure oil film bearings, dynamic pressure oil film bearings, and dynamic static pressure oil film bearings, and belong to thin oil lubrication. It is necessary to always have 

oil, so there is an oil injection hole to add new oil.

The main reasons for the lack of oil filling holes at the bearings of the electric motor include the following:

1. Closed design: Some electric motors adopt a closed design for their bearings, which does not reserve oil injection ports during the manufacturing process. The purp-

ose is to prevent external dust and pollutants from entering the interior of the bearings, thereby improving their service life and work efficiency.

2. Lubricating grease injection: Some electric motor bearings use lubricating grease instead of traditional lubricating oil. Lubricating grease has good adhesion and rust 

prevention properties, and can be kept inside the bearing for a long time to provide lubrication and protection, so there is no need for an oil injection port.

3. Long life design: Some electric motor bearings adopt a long life design, which means that no oil injection maintenance is required during the service life. This design 

facilitates the maintenance and upkeep of the motor, while also reducing the maintenance costs of the equipment.

4. Environmental requirements: In order to meet environmental requirements, some electric motors adopt oil-free bearing design to avoid lubricating oil leakage and environmental pollution, which is suitable for places with high environmental requirements.

5. The working principle of electric motor bearings: Electric motor bearings use smooth metal balls or rollers and lubricated inner and outer metal surfaces to reduce friction. 

These balls or rollers "carry" the load, support the motor spindle, and allow the motor (rotor) to rotate smoothly.

6. Maintenance and upkeep advice: Although the motor bearings do not have oil filling holes, regular lubrication and maintenance work should still be carried out according 

to the usage requirements and manufacturer's guidance to ensure the normal operation and service life of the bearings.