During the operation of industrial equipment, bearing lubrication plays a vital role in equipment stability and service life. Especially under high-speed, high-temperature, and heavy-load working conditions, lubricating oil is commonly used for rolling bearing lubrication.
Below, Wuxi USU Bearing introduces five common oil lubrication methods for rolling bearings.
1.Oil Bath Lubrication
The working principle of oil bath lubrication is to use the rotating components of the bearing to carry lubricating oil into the raceway area, after which the oil flows back into the bearing housing reservoir to achieve continuous circulation lubrication.
In practical applications, the oil level should generally remain slightly below the center of the lowest rolling element when the bearing is stationary, in order to avoid excessive oil causing temperature rise. At the same time, for more accurate oil level control, it is usually recommended to use an oil level gauge or oil level controller.
Oil bath lubrication features a simple structure and is suitable for medium- and low-speed bearings as well as general industrial equipment.
2. Oil Ring Lubrication
Oil ring lubrication mainly supplies oil through an oil ring mounted on the shaft. When the shaft rotates, the oil ring lifts lubricating oil from the oil reservoir and transfers it to an oil collection groove. The lubricant then flows through the bearing and finally returns to the oil sump.
This method can continuously provide lubrication for the bearing and is commonly used in equipment operating at relatively high speeds or elevated temperatures.
3. Circulating Oil Lubrication
When bearings operate continuously at high speeds, lubricant temperature rises and oil aging accelerates. Frequent lubricant replacement not only increases maintenance costs but also affects equipment operating efficiency. Circulating oil lubrication is specifically designed for such working conditions.
This system usually uses an oil pump to keep the lubricant continuously circulating. After passing through the bearing, the lubricant returns to the oil tank, where it is filtered and cooled before re-entering the bearing system.
Advantages of circulating oil lubrication include:
* Effectively reducing bearing operating temperature
* Extending lubricant service life
* Reducing contaminants entering the bearing
* Prolonging overall bearing lifespan
Therefore, this lubrication method is widely used in high-speed spindles, large industrial machinery, and continuously operating equipment.
4. Oil Jet Lubrication
Oil jet lubrication uses high pressure to inject lubricating oil directly into the bearing, ensuring sufficient lubrication even under high-speed operating conditions. The oil injection speed usually needs to exceed 15 m/s in order to effectively penetrate the turbulent airflow generated by high-speed bearing rotation.
Oil jet lubrication is commonly used in:
* High-speed machine tools
* Turbine equipment
* Precision spindles
* High-speed industrial motors
Oil jet lubrication offers excellent cooling performance and high lubrication efficiency, making it highly suitable for high-speed equipment.
5. Oil-Air Lubrication
Oil-air lubrication, also known as oil spot lubrication, is currently considered one of the more advanced lubrication methods in the field of high-speed bearings.
This method uses compressed air to deliver a precisely metered small amount of lubricating oil into the bearing, achieving “minimum oil, maximum efficiency” lubrication.
Advantages of oil-air lubrication include:
* Low lubricant consumption
* Lower bearing temperature rise
* Higher operating speeds
* Effective prevention of contaminants entering the bearing
In addition, compressed air helps cool the bearing and creates positive pressure inside the bearing housing, reducing the entry of dust, moisture, and other impurities.
At present, oil-air lubrication is widely used in:
* High-speed rolling mills
* Precision machine tools
* Automated production equipment
* High-speed electric spindles
Precautions for Bearing Oil Lubrication
In practical applications, special attention should be paid to the following points:
* Regularly inspect lubricant contamination conditions
* Replace aged lubricating oil promptly
* Keep the oil supply system unobstructed
* Properly design the oil return structure
* Select lubricating oil suitable for operating conditions
Especially in circulating oil and oil-air lubrication systems, the oil supply pipeline size must be properly designed to ensure that lubricating oil can smoothly flow out of the bearing area, preventing oil accumulation and excessive temperature rise.
Conclusion
Selecting a suitable bearing oil lubrication solution not only improves equipment operating stability, but also effectively reduces equipment failure rates and maintenance costs.
As a professional bearing supplier and service provider, Wuxi USU Bearing continuously provides customers with bearing selection support, lubrication solutions, and industrial transmission supporting services. For more bearing technical information and industry application solutions, please feel free to contact Wuxi USU Bearing for further communication.
