Analysis of the clearance of rolling bearings

**Analysis of the Clearance in Rolling Bearings** Home > Bearing Knowledge > Analysis of the Clearance in Rolling Bearings --- *Source: Bearing Network | Date: June 8, 2014* --- Rolling bearings are essential components in many mechanical systems. One of the key factors that affect their performance is the clearance within the bearing. The term "clearance" refers to the maximum movement possible between the inner and outer rings of a bearing when one of them is fixed. This movement can occur either radially or axially. Radial clearance is the maximum movement in the radial direction, while axial clearance refers to the maximum movement along the axis of the bearing. Typically, the larger the radial clearance, the greater the axial clearance, and vice versa. There are three main types of clearance in rolling bearings: 1. **Original Clearance**: This is the clearance present in the bearing when it is manufactured and not yet installed. It is determined during the production process and is based on the design specifications. 2. **Installation Clearance (or Fit Clearance)**: This is the clearance that exists after the bearing is mounted on the shaft and in the housing. Depending on whether the fit is interference or clearance, this clearance may be reduced or increased due to thermal expansion or contraction. 3. **Working Clearance**: This is the actual clearance that exists during operation. As the bearing rotates, heat is generated, especially in the inner ring, causing it to expand. This thermal expansion reduces the clearance, which can impact the bearing's performance and lifespan. Some types of bearings have fixed clearances and cannot be adjusted. These include bearings from series 0000 to 5000. On the other hand, certain bearings like 6000 (angular contact bearings), 1000, 2000, and 3000 (with tapered inner rings) allow for clearance adjustment. Once adjusted, the clearance may become larger than the original. Bearings such as 7000 (tapered roller bearings), 8000 (thrust ball bearings), and 9000 (thrust roller bearings) do not have an original clearance. Instead, their clearance is adjusted depending on the application. For 6000 and 7000 series bearings, radial clearance is usually adjusted, while for 8000 and 9000 bearings, axial clearance is more important. Choosing the correct clearance is crucial for the proper functioning of a rolling bearing. Too much clearance can lead to vibration and noise, while too little can cause excessive friction and overheating. --- **Related Articles:** - Eight Key Functions of Motor Bearing Greases - Key Skills for Wind Power Bearings - Sealing and Smoothing of SKF THD Take-Up Housings - Noise Caused by Manufacturing Factors and Solutions - Tips for Disassembling and Installing IKO Bearings --- This article was originally published on China Bearing Network. For more information, visit [http://www.chinabearing.net](http://www.chinabearing.net) Previous: Bearing Storage Issues Next: How to Distinguish Bearing Quality

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