In a previous article, we discussed how ball bearings are components designed to reduce friction between mechanical parts. Their presence is crucial for ensuring safer and more consistent system movement. Proper functioning of these components ensures the efficiency and effectiveness of the vehicle or device they are installed in.
Now, let us take a step forward in exploring the main topics related to bearings by asking: What is bearing clearance, and why is it important to familiarize yourself with this concept, which frequently appears in technical or semi-technical discussions?
Internal Clearance in Ball Bearings
To provide a precise definition, let us begin by stating that the internal clearance of a bearing refers to the displacement of one ring relative to the other, either radially or axially (referred to as radial internal clearance or axial internal clearance, respectively).
Initial Clearance or Operating Clearance?
Having clarified this, it is also essential to understand the distinction between two different forms of clearance: the initial internal clearance and the operating internal clearance. As the terms suggest, the first refers to the clearance in the bearing before mounting, while the second relates to bearings already in operation and that have reached a stable temperature.
Operating Internal Clearance Values
Typically, the initial internal clearance in bearings is greater than the operating internal clearance. The reasons for this can be many, but they are mainly related to interference fits on the shaft or housing, as well as the thermal expansion of the bearing rings on one side and the coupling components on the other.
Choosing Internal Clearance
At this point, it is worth highlighting that operating internal clearance in a bearing can be influenced by various factors. Unless you have sufficient practical expertise, it may be challenging to fully grasp these nuances. For example, operating clearance can be significantly affected by preload class, the actual fit of the bearing in the tapered seat, the effects of shape errors, or dimensional variations caused by operating temperature (which may relate to device startup or seasonal factors).
To learn more, we recommend consulting your trusted technician and discussing all aspects related to the correct handling of internal clearance in ball bearings.
We also remind you that at Cuscinetti & Componenti, you will find a wide catalog of bearings from top brands, along with the usual courtesy of a staff ready to meet your information requests. Our reliable pre- and post-sales technical support ensures customer satisfaction.