Full definition
Spherical roller bearings are a type of self-aligning bearing that feature two rows of barrel-shaped rollers arranged between an inner ring and a spherical outer raceway. This unique design allows for the accommodation of misalignment between the shaft and housing, making them particularly effective in situations where shaft deflection or misalignment is expected. They can tolerate shaft misalignment angles of up to 2° to 3° without negatively impacting their service life, which is critical in applications subjected to vibration and shock loads. The high dynamic load capacity, denoted by the basic dynamic load rating (C), can reach up to 4,750 kN, making spherical roller bearings suitable for demanding industrial conditions.
These bearings come in various series, with the most common being the 22200 and 23000 series. They are manufactured according to the ISO 15 standard, which specifies the dimensional and performance requirements for rolling bearings. The spherical design of the outer raceway allows for angular misalignment, while the barrel-shaped rollers provide a large contact area, enhancing load distribution and extending the bearing's lifespan.
Spherical roller bearings are widely utilized in applications such as flexible shafts, industrial fans, mills, and heavy-duty gearboxes. They are particularly advantageous in environments where heavy loads and high speeds are present. To ensure optimal performance, these bearings require proper lubrication, typically using NLGI 2 grease or circulating oil systems. Adequate lubrication not only minimizes friction but also helps in cooling and removing contaminants, which is vital for maintaining bearing integrity and performance over time.