Double row angular contact ball bearings, recognized as critical components in mechanical equipment and often referred to as the “joints of machinery,” directly influence the efficiency, performance, and lifespan of the entire apparatus. However, if used or stored improperly, these precision bearings are susceptible to rusting. So, how can effective lubrication and rust prevention be ensured to maintain the long-term stable operation of double row angular contact ball bearings?

Characteristics of Double Row Angular Contact Ball Bearings

Double row angular contact ball bearings are meticulously designed with advantages such as higher load capacity, low friction and heat generation, and high-speed operation. These features make them widely used in various industries, including machine tools, automotive, aerospace, robotics, and construction machinery, all of which demand high precision, reliability, and durability.

Importance of Lubrication

Lubrication is crucial to ensure the smooth operation of double row angular contact ball bearings. Lubrication not only reduces friction and wear but also effectively prevents the intrusion of dust and rust. Common lubrication methods include grease lubrication and oil lubrication. Among them, grease lubrication is widely used in various types of machinery due to its long-lasting nature and simple sealing devices.

Lubrication Methods

1. Fill Method for Housing Interior

Fill the housing interior of the bearings with an appropriate amount of grease to ensure sufficient lubrication during operation. Each time grease is replenished or replaced, specific filling methods should be used to ensure even distribution.

2. Pipeline Connection Lubrication Method

For multiple double row angular contact ball bearings requiring lubrication, use a pipeline connection method to deliver grease to each bearing. This method is suitable for large-scale machinery and can effectively improve lubrication efficiency.

3. Lubrication Frequency

Depending on the industry of application, lubrication frequency for double row angular contact ball bearings may vary. In clean environments, lubrication intervals for normal load and medium-speed operation are typically every 3 to 6 months, while for low-speed light-load intermittent operation, lubrication is recommended every 6 to 12 months or annually. In harsh environments with heavy loads and high-speed operation (e.g., construction machinery, automotive), lubrication intervals should be monthly or more frequent. In high-temperature environments or extreme temperature changes, intervals should be shortened by approximately 50%, while in consistently low-temperature environments, intervals may be slightly extended. Regular monitoring and inspection of bearings are essential to determine if lubrication is adequate. Signs of insufficient lubrication include increased noise, vibration, or elevated operating temperatures.

Please refer to the bearing manufacturer’s specific lubrication interval recommendations based on their professional knowledge and product testing, and consider the actual operating time of the bearings to schedule lubrication and maintenance regularly.

Rust Prevention Measures

In addition to lubrication, rust prevention is crucial for protecting double row angular contact ball bearings. Several commonly used rust prevention methods include:

1. Immersion Method

Immerse the bearings in rust preventive oil to form a protective layer on the surface. By controlling the temperature or viscosity of the rust preventive oil, the desired oil film thickness can be achieved.

2. Brush Coating Method

For outdoor construction equipment or bearings with special shapes unsuitable for immersion or spraying, the brush coating method can be used for rust prevention treatment. Care should be taken to avoid accumulation during brushing while preventing leakage.

3. Spraying Method

For large-scale rust prevention objects, such as those unsuitable for immersion oil application, the spraying method can be used for rust prevention treatment. Use filtered compressed air at approximately 0.7 MPa pressure for spraying in a clean air environment. However, strict fire prevention and labor protection measures should be taken.

4. Purchase Recommendations

When purchasing, opt for high-quality corrosion-resistant double row angular contact ball bearings. Some high-standard bearing manufacturers consider environmental factors affecting bearings during the design phase, thus using corrosion-resistant materials. Corrosion resistance tests are also conducted during the bearing testing phase, providing an important guarantee for preventing bearing rust.

Conclusion

In conclusion, lubrication and rust prevention are key measures to ensure the long-term stable operation of double row angular contact ball bearings. In practical applications, appropriate lubrication methods and rust prevention measures should be selected based on specific circumstances, and operations should strictly follow procedures to ensure the performance and lifespan of the bearings.