If you want to increase a bearing’s service life, is it always best to choose the one with the highest load rating?
Unfortunately, that is FALSE – what is the point of a high load rating, if the lubrication is not suited for the application in question? A complete and correct overall specification of the roller bearing is therefore needed.
Many years worth of studies have shown that 85% of all roller bearing failures can be eliminated in practice by choosing application-specific seals and lubricants. In such cases, it isn’t enough to select a higher performance class because the service life is impaired by an extremely poor tribological condition in the roller bearing.
In principle, a distinction is made between the static load rating C0 and the dynamic load rating Cdyn.
The static load rating is the level of loading at which a plastic deformation of more than 0.01% of the ball diameter occurs, thus damaging the bearing.
The dynamic load rating gives the equivalent bearing load at which a bearing’s odds for survival are 90% after one million revolutions.
By using the right sealing technology and the right lubricant, the desired service life can be increased considerably thanks to a more advantageous tribological condition in the roller bearing and even be achieved in a lower performance class.
This describes friction and how lubrication can help reduce wear.
In the case of full lubrication, the load is fully absorbed by the lubricant. There is no contact between the friction partners (no wear), thus making it an ideal condition that is sought after when selecting a lubricant.
If the load cannot be fully absorbed, it is referred to as partial lubrication. The roughness peaks of the friction partners come into contact with each other, which leads to wear. If the lubrication breaks down completely, the bearing can be prevented from failing much too quickly by applying boundary layer lubrication. Solid lubricants or special additives (e.g. heavy-duty additives) form a reaction layer on the surface and reduce wear.
More on lubricants
We have taken our many years of expertise as an opportunity to introduce the ABEG® eXtreme series for our customers for extreme application conditions. The ABEG® eXtreme series unites the right sealing technology with the right selection of lubricating grease: ideal for all operating conditions that go beyond the “standard”.
For example, the ABEG® eXtreme series achieves a service life up to 4 times as long as standard premium bearings. Optimum rolling bearing technology is therefore a matter of having the most accurate knowledge of operating conditions possible and thus the right specification, in particular in terms of sealing technology and the choice of lubricant.