ABSTRACT
Rolling element bearings are typical tribological components. They utilize rolling contacts between the rolling elements and raceways to support load while permitting constrained motion of one body relative to another. The standard configuration of a rolling element bearing comprises inner and outer rings, a set of rolling elements arranged in a row between the inner and outer rings, and a retainer or cage to maintain a proper annular spacing between the rolling elements (Figure 28.1). Some bearings also have seals as integrated components. Due to their wide availability and versatility, rolling element bearings are, perhaps, the most widely used bearing type. Rolling element bearings are characterized by little or
no sliding motion. They usually generate less friction and have low starting torque compared to hydrodynamic bearings. Unlike hydrodynamic bearings, the performance of rolling element bearings is less susceptible to changes in load, speed, and temperature. Most rolling element bearings are capable of carrying both radial and thrust loads. Because of rolling contact, the dependency on lubricant is not as critical. This makes rolling element bearings easier to maintain. Well-designed and well-built rolling element bearings can operate over wide ranges of load and speed. Such features often put rolling element bearings on the top of the bearing selection list.
