The advantages and disadvantages of oil bath bearings are as follows:
advantage
Adequate and stable lubrication
Oil bath bearings immerse the bearing part in lubricating oil and use rotating components to lift the lubricating oil to form an oil film, ensuring that the contact surfaces of the bearing are continuously lubricated and reducing friction and wear. This lubrication method is effective at low or medium speeds, especially suitable for scenarios that require stable lubrication.
Good cooling effect
Lubricating oil can absorb the heat generated by bearing operation during circulation, effectively reducing bearing temperature. Compared to grease lubrication, oil bath lubrication has better heat dissipation performance and is suitable for equipment that needs to control temperature rise in medium and low-speed scenarios.
Simple structure and low cost
The oil bath bearing system usually consists of bearings, bearing seats, and lubricating oil, without the need for complex lubrication devices (such as oil pumps, oil pipes, etc.). It has a simple structure, easy maintenance, and low equipment and maintenance costs.
Strong corrosion resistance
The enclosed bearing design can avoid direct erosion damage to the bearing and shaft caused by corrosive gases such as acid and alkali, prolong the service life of the bearing, and is suitable for harsh environments such as chemical and metallurgical industries.
Long lifespan
The integral bearing seat has good concentricity, which can effectively improve the bearing life. When lubricated with engine oil, the bearing life can reach over 100000 hours.
low energy consumption
Oil lubrication can reduce the coefficient of friction, thereby reducing kinetic energy consumption. According to relevant data, oil bath bearings can reduce kinetic energy consumption by 5% to 15%, which helps improve equipment energy efficiency.
shortcoming
The fuel supply is difficult to adjust
The oil supply of oil bath bearings is limited by the oil level height, making it difficult to adjust flexibly according to actual needs. If the oil level is too high, it may lead to increased mixing losses and intensified temperature rise; If the oil level is too low, there will be insufficient lubrication, which will affect the service life of the bearing.
Easy to be contaminated by impurities
If there is no filtering device in the oil tank, impurities in the lubricating oil may be carried into the bearing and damage the bearing surface. Therefore, it is necessary to regularly check the cleanliness of the oil and replace deteriorated lubricating oil in a timely manner, otherwise it may lead to a 40% to 60% reduction in bearing life.
Not applicable to high-speed bearings
When oil bath bearings operate at high speeds, the friction between the rolling elements and the lubricating oil generates a large amount of heat, causing the oil temperature to rise and affecting the lubrication effect. In addition, the stirring loss during high-speed operation will also increase, so oil bath lubrication is more suitable for low-speed or medium speed bearings.
High requirements for oil level control
The oil level of oil bath bearings should be strictly controlled within an appropriate range. For the horizontal axis, the oil level should be controlled near the center of the rolling element at the bottom of the bearing; For the vertical axis, the static oil level should cover 50% to 80% of the rolling elements. Excessive or insufficient oil level can affect lubrication efficiency and equipment operation stability.
The maintenance cycle is long but requires regular testing
Although the maintenance cycle of oil bath bearings is relatively long, it is necessary to regularly check the oil level and cleanliness of the oil. If the oil contamination index exceeds the specified standard, the lubricating oil should be replaced immediately, otherwise it may affect the bearing performance.