Rolling Bearings Terms and Definitions
1. Bearing – A component that consists of an inner and outer ring with rolling elements between the two to reduce friction and support axial and radial loads.
2. Retainer – A component that holds the rolling elements in place in between the inner and outer rings of a bearing.
3. Seal – A component that helps keep lubrication inside a bearing, keeping dirt, moisture and other contaminants out.
4. Race – The rings that hold the rolling elements in a bearing and allow them to move freely.
5. Cone and Cup – The basic units that make up a bearing, consisting of the inner and outer rings that hold the rolling elements.
6. Axial Load Ratings – The maximum amount of force that can be applied to a bearing in an axial direction without any adverse effects.
7. Radial Load Ratings – The maximum amount of force that can be applied to a bearing in a radial direction without any adverse effects.
8. Lubrication – The process of adding lubricant to a bearing to reduce friction and wear, and to provide a protective film between the bearing components and the environment.
9. Pre-lubrication – The application of lubricant to a bearing before it is installed to prevent wear and damage during transport and installation.
10. Grease – A specific type of lubricant composed of a base oil and a thickener used to lubricate rolling bearings.
11. Splash Lubrication – The application of lubricant to a bearing by pouring the lubricant onto the bearing or using a special type of pump.
12. Oil Lubrication – The application of lubricant to a bearing by using a special type of pump to supply lubricant to a bearing.
13. Clearance – The gap between the inner and outer rings of a bearing that is required to allow the bearing to run freely without any interference or contact.
14. Internal Clearance – The amount of space between the inner and outer rings of a bearing that allows the bearing to run freely without any interference or contact when there is no load applied.
15. External Clearance – The amount of space between the inner and outer rings of a bearing that allows the bearing to run freely when a load is applied.
16. Misalignment – When the inner and outer rings of a bearing are not properly aligned and the bearing does not rotate as freely as is should.
17. Raceway – The inner and outer rings that an area where the rolling elements travel.
18. Cage – A component of a bearing that spaces and guides the rolling elements and helps reduce friction within the bearing.
19. Load – The force applied to a bearing as a result of weight, pressure or other forces.
20. Static Load – The load applied to a bearing when it is not rotating.
21. Dynamic Load – The load applied to a bearing when it is rotating.
22. Service Life – The amount of time a bearing can operate without servicing or replacement before it becomes worn or damaged.
23. Temperature Range – The range of temperature that a bearing can safely operate under.
24. Runout – The amount of movement in a bearing when it is rotating.
25. Bearing Housing – The mounting point for a bearing that helps keep it in place and precise orientation.
