Rolling Bearing Terms and Definitions
Rolling bearings are components that allow rotational or linear movement between two parts and play an important role in mechanical systems. Rolling bearings are divided into two types: radial bearings and thrust bearings.
Spider bearing:
This is a type of bearing where multiple rolling elements align in a spherical pattern on the outer surface of the inner race. This type of bearing is capable of taking on radial and axial loads.
Radial bearing:
This is a type of bearing where the rolling elements align in a line along the circumference of the inner race. They are used to handle radial loads.
Thrust bearing:
This is a type of bearing in which the rolling elements align in a line along the circumference of the inner race. These bearings are used to take on thrust loads in a single direction only.
Ring:
This is the outer housing of the bearing, which is designed specifically to enclose the inner race and rolling elements.
Inner Race:
This is the inner component of the bearing which houses and guides the rolling elements.
Outer Race:
This is the outer component of the bearing which supports the inner race.
Cage:
This is the component that separates and supports each rolling element, allowing them to rotate freely.
Rolling Element:
These are the components that provide the actual contact between the inner race and outer race and are capable of handling both radial and thrust loads. The most common types of rolling elements used in bearings are balls and needles.
Annular Groove:
This is the groove located in the inner race of the bearing, which is designed to provide a space for the rolling elements to pass through.
Flange:
This is the component used to secure the bearing to the shaft. The flange also helps to reduce axial movement between the inner and outer races.
Seals:
These components are designed to prevent contaminants from entering the bearing, as well as to retain the lubricant.
Lubricant:
This is a fluid or a solid used to reduce friction and wear between two moving parts.
Clearance:
This is the amount of space between the inner and outer races of the bearing and is necessary for proper functioning.
Preload:
This is the force that is applied to the bearing during installation to ensure proper seating and reduce vibration.
Radial Load:
This is a force that is applied to the bearing in a radial direction, perpendicular to the axis of rotation.
Thrust Load:
This is a force that is applied to the bearing in an axial direction, parallel to the axis of rotation.
Vibration:
This is the oscillation of the bearing that can cause premature wear and damage to the bearing components.
Noise:
This is the audible sound emitted by the bearing due to high vibration and lack of lubrication.
