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Feb . 21, 2024 16:56 Back to list

Overview of Spherical Roller Bearings


JVN_BEARINGS_SPHERICAL_ROLLER_BEARINGS_COVER_PHOTO

Spherical roller bearings are rolling-element bearings that permit rotation with low friction and permits angular misalignment. These bearings support a rotating shaft in the bore of the inner ring that may be misaligned in respect to the outer ring. The misalignment is possible due to the spherical internal shape of the outer ring and spherical rollers. Despite their name, spherical roller bearings are not truly spherical in shape. The rolling elements of spherical roller bearings are mainly cylindrical in shape, but have a profile that makes them appear like cylinders that have been slightly over-inflated. The spherical roller bearing was invented by engineer Arvid Palmgren his design is still in use in modern machines.

 

4 Bolt UCF 200 Series Pillow Block BearingsT

 

How do Spherical Roller Bearings Work?

All spherical roller bearings have the same working principal. They all have outer rings that with concave (spherical) inner raceways. The inner rings similarly have convex outer raceways (or rolling elements that create a matching convex sliding surface). What separates the various types of spherical bearings is the design of their sliding surface. Some are ring-to-ring (such as spherical plain bearings and rod ends), others use rolling elements such as balls or rollers between the inner and outer rings.

Applications of Spherical Roller Bearings

  • Gearboxes, Drive Shafts
  • Wind Turbines,
  • Continuous Casting Machines,
  • Pumps,
  • Mechanical Fans and Air-Blowers,
  • Mining and Construction Equipment,
  • Textile Manufacturing
  • Wood Working Machinery
  • Overhead Crane Moving Wheel
  • Pulp and Paper Processing Equipment,
  • Marine Propulsion
  • Offshore Drilling,
  • Off-road vehicles.

Types of Spherical Roller Bearings

  • Spherical Roller Bearings: They are designed to work in applications where severe misalignment exists. This maybe due to mounting error or shaft deflection. They deal with relatively heavy radial loads and some axial loads in either direction. They are also extremely resistant to shock loads and their self-aligning feature allows full capacity loading despite shaft deflection. They are very similar in purpose to Self-Aligning Double Row Ball Bearings, except the Spherical Roller Bearings are designed to be more robust by carry heavier loads but at lower maximum speeds.
  • Spherical Plain Bearings: (also known as “Spherical Plane Bearings“) are spherical bearings that have an inner ring with a sphere convex outside surface and an outer ring with a correspondingly sphere, but concave inside surface. Their design makes them particularly suitable for bearing arrangements where alignment movements between shaft and housing have to accommodate, or where oscillating or recurrent tilting movements must be permitted at relatively slow sliding speeds.
  • Spherical Rod End Bearings: A type of spherical bearing that consists of an eye-shaped head with integral shank forming a housing and a standard spherical plain bearing, or a spherical plain bearing inner ring. As the name implies, they are used at the end of rods and have either a male or female thread for mounting.
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