BA220-6SA Angular Contact Ball Bearing Customized For Excavator Travel / Slewing Mechanisms

In the complex and harsh operating environment of excavators, bearings, as key components, directly determine the stability, reliability, and service life of the equipment. The BA220-6SA excavator bearing is specifically designed to meet such challenges. With its excellent structure, materials, and performance advantages, it has become a trusted choice for many excavator manufacturers and users.

I. Precisely Adapted Dimensional Specifications

    1.Inner Diameter: 220mm. This dimension is precisely designed to achieve an accurate fit with the shaft diameter of relevant components in the excavator. Whether in the excavator's traveling mechanism or other critical parts, it can ensure a tight connection with the shaft. During high-speed operation and under heavy loads, it effectively prevents relative sliding, guarantees stable power transmission, and lays the foundation for the smooth operation of the equipment.

    2.Outer Diameter: 276mm. The design of the outer diameter not only considers installation compatibility with other components but also focuses on providing sufficient structural strength for the bearing. When facing various complex stresses generated during excavation operations, the larger outer diameter can evenly distribute the load, enhance the overall deformation resistance of the bearing, and ensure that it maintains good working condition even under heavy-load conditions.

    3.Width: 26mm. The reasonable width design ensures that the bearing has sufficient axial load-carrying capacity while taking into account the compactness requirements of the equipment's spatial layout. Within the limited installation space, it can effectively bear axial forces, prevent axial movement of the shaft during operation, and at the same time, not affect the normal installation and operation of other equipment components due to excessive size, achieving a balance between space utilization and performance.

II. High-Quality and Reliable Manufacturing Materials

    1.Bearing Steel Material: The main body of the BA220-6SA bearing is made of GCr15 chromium steel. GCr15 chromium steel has extremely high hardness, and after a special heat treatment process, its hardness can reach HRC60-65. This enables the bearing to effectively resist wear caused by frequent impacts and friction during excavation operations. At the same time, this material has good fatigue resistance, and can maintain stable structure and performance when subjected to alternating loads for a long time, greatly extending the service life of the bearing and reducing equipment downtime caused by bearing failures.

    2.Cage Material: The cage, as a key component to maintain the stability of the movement of the rollers inside the bearing, has an important impact on the overall performance of the bearing. The cage of the BA220-6SA bearing can be made of nylon or steel. Nylon cages are lightweight and have good self-lubricating properties, which reduce friction resistance during bearing operation and effectively reduce noise, making them suitable for operating environments with high noise control requirements. Steel cages, on the other hand, with their high strength and good rigidity, perform better under large impact loads, ensuring that the rollers maintain the correct movement trajectory even under extreme working conditions, and improving the reliability and stability of the bearing. Users can flexibly choose the appropriate cage material according to the actual working conditions of the excavator.

III. Unique and Efficient Structural Design

    1.Angular Contact Ball Bearing Structure: The BA220-6SA is an angular contact ball bearing, with a contact angle usually designed to be 40 degrees. This special angle design endows the bearing with strong axial load-carrying capacity, enabling it to easily cope with various axial forces generated during the operation of the excavator, such as the digging force during excavation and the lateral force during steering. At the same time, the bearing can still maintain good rotational accuracy when bearing axial loads, ensuring the smooth movement of relevant components of the excavator and providing a guarantee for the precise operation of the equipment.

    2.Multi-Steel Ball Layout: To further improve the bearing capacity of the bearing, the BA220-6SA adopts a multi-steel ball layout in its internal structural design. Compared with other ordinary bearings of the same size, it contains a larger number of steel balls. Under the same working conditions, more steel balls can evenly distribute the load, reduce the pressure on each steel ball, thereby effectively increasing the upper limit of the bearing's load-carrying capacity. This design feature enables the BA220-6SA bearing to operate stably and reliably in the heavy-load working environment of the excavator, such as when excavating hard rocks and moving large heavy objects, reducing the risk of bearing damage due to overload.

IV. Excellent Performance

    1.High-Precision Operation: The BA220-6SA bearing adopts advanced processing technology and strict quality control standards during manufacturing to ensure high precision. The processing accuracy of its inner and outer ring raceways and steel balls is extremely high, and during operation, the error can be controlled within a very small range. This not only ensures the smooth rotation of the bearing, reduces vibration and noise caused by unstable operation, but also improves the overall operational accuracy of the equipment. For excavators, high-precision bearings can ensure the accuracy of excavation operations, improve work efficiency, and reduce material waste and equipment loss caused by operational errors.

     2.Low-Noise Operation: Noise pollution at the excavator's work site is a problem that cannot be ignored. The BA220-6SA bearing effectively reduces noise during operation through optimized structural design and the selection of appropriate manufacturing materials. As mentioned earlier, the use of nylon cages reduces friction noise to a certain extent; at the same time, high-precision processing technology makes the cooperation between various parts of the bearing closer and smoother, further reducing operating noise. The low-noise operation feature not only improves the working environment of operators, reduces hearing damage caused by long-term exposure to high noise environments, but also enables the excavator to work smoothly in workplaces with strict noise restrictions, such as urban construction and indoor demolition.

     3.Long Service Life: Combining the above high-quality materials, unique structure, and excellent performance, the BA220-6SA bearing has an ultra-long service life. It can operate continuously and stably in harsh operating environments such as high temperature, high pressure, and heavy dust, and withstand frequent impacts and vibrations. Under normal use and maintenance, the service life of this bearing is significantly longer than that of ordinary bearings, reducing the number of equipment maintenance and repair costs, and improving the economic efficiency of excavator use. For large-scale construction projects, the stable operation of equipment and low maintenance costs are of great significance for ensuring project progress and controlling project costs.

V. Wide and Diverse Application Scenarios

    1.Excavator Traveling Mechanism: As one of the core components of the excavator, the traveling mechanism has extremely high requirements for bearing performance. The BA220-6SA bearing, with its strong load-carrying capacity, good rotational performance, and excellent impact and vibration resistance, has become an ideal choice for the excavator's traveling mechanism. Whether in flat construction sites, rugged mountainous areas, muddy wetlands, or other complex terrain conditions, this bearing can ensure the excavator travels smoothly and steers  flexibly, providing reliable mobile support for excavation operations.

    2.Slewing Device: The slewing device of the excavator is responsible for realizing the 360-degree rotation of the working device and plays a key role in excavation, loading, and unloading of materials. The high precision and low noise characteristics of the BA220-6SA bearing enable it to ensure the accuracy and stability of rotation in the slewing device, avoiding inaccurate material loading and unloading or equipment collision accidents caused by slewing errors. At the same time, its good axial and radial load-carrying capacity can bear various forces generated during slewing, ensuring the reliable operation of the slewing device.

    3.Other Critical Parts: In addition to the traveling mechanism and slewing device, the BA220-6SA bearing can also be applied to other critical parts of the excavator that have high requirements for bearing performance, such as the connecting parts of the boom, stick, and bucket. In these parts, the bearing needs to bear frequent impact loads and complex stress changes, and the excellent performance of the BA220-6SA bearing can fully meet these working conditions, providing strong support for improving the overall performance of the excavator.

The BA220-6SA excavator bearing, with its precise dimensional specifications, high-quality manufacturing materials, unique structural design, excellent performance, and wide application scenarios, has become an important guarantee for the efficient and reliable operation of excavators. Whether in large-scale mining, infrastructure construction, or small urban engineering operations, the BA220-6SA bearing can give full play to its advantages and contribute significantly to the development of the excavator industry.