Spherical roller bearings have two rows of tapered rollers and are self-aligning, making them suitable for high shock or misaligned loads. They are expensive but have a longer life and can accommodate large degrees of angular deflection and higher operating speeds. They consist of an inner ring, captive roller raceway, and outer ring with a double row of barrel-shaped rollers in a brass or stainless steel cage. They can operate under extreme conditions with minimal lubrication and have heavy-duty variants for demanding applications. Spherical roller bearings are the only type suitable for vibrating screens and can operate at higher rotational speeds than other bearings.
A spherical roller bearing had two rows of inner roller elements that tapered towards the end much like a wine barrel. This type of bearing is self-aligning and generally used where high shock or misaligned loads are common. Spherical roller bearings are relatively expensive but generally have a longer life than other types of bearings. They are also available as heavy-duty variants for use in high-load applications. A spherical roller bearing can not only accommodate large degrees of angular deflection but also generally higher operating speeds.
Spherical roller bearings share a common basic design with straight and tapered roller bearings in that they consist of an inner ring, a captive roller raceway and an outer ring. The main difference in the designs is in the roller set which consists of a double row of barrel shaped rollers usually held in a brass or stainless steel cage. This design allows the rows of rollers in a spherical roller bearing to operate at different speeds, thereby allowing the bearing to absorb high levels of linear deflection. This feature gives this design a combination of radial and thrust characteristics, making it exceptionally strong.
Due to the relative complexity of the manufacturing process involved, spherical roller bearings are more expensive than other designs. However, they have a longer service life due to their inherently rugged nature. These bearings are capable of operating under extreme conditions with minimal lubrication up to twice as long as conventional roller and ball bearings. Some spherical roller bearing variants may include perforated outer ring and oil groove features in their design to facilitate lubrication and further extend their longevity. Overall, this increased life, along with the savings in bearing replacement downtime, justifies the additional costs involved in installing this type of bearing.
Some ranges of spherical roller bearings are available with heavy-duty rollers and cages suitable for extreme demanding applications such as vibrating screens. This type of machinery reduces the work of a conventional bearing due to the constant shock load and linear deflection involved in its operation. In this type of aggressive operating environment, the spherical roller bearing is the only type that offers acceptable life. This type of bearing can also be used at rotational speeds generally higher than those of other types of bearings. In some cases, this difference in limit speed can be as much as 20% or more.
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