17 Facts About Rolling-element bearings

One of the earliest and best-known rolling-element bearings are sets of logs laid on the ground with a large stone block on top.

Rolling-element bearings have the advantage of a good trade-off between cost, size, weight, carrying capacity, durability, accuracy, friction, and so on.

Caged roller Rolling-element bearings were invented by John Harrison in the mid-18th century as part of his work on chronometers.

Roller bearings are the earliest known type of rolling-element-bearing, dating back to at least 40 BC.

Roller Rolling-element bearings typically have a higher radial load capacity than ball Rolling-element bearings, but a lower capacity and higher friction under axial loads.

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Spherical roller Rolling-element bearings have an outer ring with an internal spherical shape.

However, spherical rollers are difficult to produce and thus expensive, and the Rolling-element bearings have higher friction than an ideal cylindrical or tapered roller bearing since there will be a certain amount of sliding between rolling elements and rings.

Gear Rolling-element bearings could be used, for example, as efficient rotary suspension, kinematically simplified planetary gear mechanism in measuring instruments and watches.

Tapered roller Rolling-element bearings are used, for example, as the wheel Rolling-element bearings of most wheeled land vehicles.

CARB Rolling-element bearings are typically used in pairs with a locating bearing, such as a spherical roller bearing.

Thrust Rolling-element bearings are used to support axial loads, such as vertical shafts.

Rolling-element bearings are often used for axles due to their low rolling friction.

Linear motion roller-element Rolling-element bearings are typically designed for either shafts or flat surfaces.

Flat surface Rolling-element bearings often consist of rollers and are mounted in a cage, which is then placed between the two flat surfaces; a common example is drawer-support hardware.

Under controlled laboratory conditions seemingly identical Rolling-element bearings operating under identical conditions can have different individual endurance lives.

Metric rolling-element bearings have alphanumerical designations, defined by ISO 15, to define all of the physical parameters.

The third character is the radial clearance, which is normally defined by a number between 0 and 9, in ascending order, however for radial-thrust Rolling-element bearings it is defined by a number between 1 and 3, inclusive.