Determination of Bearing Clearance

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Measuring bearing clearance is a critical process to ensure proper performance and longevity of the bearing. The method varies depending on whether the bearing is mounted or not, and it requires precision and attention to detail. When measuring the clearance of a free-standing bearing unit, the first step is to place the bearing on a flat surface. Apply gentle pressure on the outer ring to ensure it is stable and not tilted. Rotate the inner ring by half to one full turn to allow the rollers to settle in their natural position. Once the rollers are properly aligned, measure the internal clearance using a feeler gauge. The orientation and measurement points will differ based on the bearing's outer diameter. For bearings with an outer diameter greater than 200mm, the clearance is measured by inserting the feeler gauge between the two rows of rollers directly above the bearing and the outer ring. Additionally, measurements are taken in the left and right symmetrical directions of the bearing, between the inner ring and the rollers. This helps determine the internal clearance for each side. The internal clearance (R) is calculated as the average of the clearances measured on the top and bottom of the bearing. For example: RT = ½(r₁ + r₂) Similarly, for the left and right sides, the internal clearance is determined by averaging the readings from both sides: RL = ½(rL₁ + rL₂) RR = ½(rR₁ + rR₂) Finally, the overall internal clearance of the bearing is calculated as: r = ½(RT + RL + RR) When measuring the clearance of a bearing that is already mounted on a shaft or sleeve, the process is slightly different. Ensure the bearing is in a straight position and rotate the outer ring by half to one full turn. Then, measure the clearance when the roller is in a sagging condition. Again, the orientation of the feeler gauge depends on the outer diameter of the bearing. For bearings with an outer diameter over 200mm, the same method applies: measure the clearance between the two rows of rollers and the outer ring in the upper and lower positions, as well as in the left and right symmetrical directions. The internal clearance is then calculated using the following formula: r = ½(rS + rL + rR) It’s important to note that temperature plays a significant role in accurate clearance measurements. The temperature of the measuring instrument and the component being tested must be considered. Bearings heated using oil tanks or induction heaters should be fully cooled before measurement. For example, if a bearing is transported from storage to the measurement site, it may have a higher temperature, which can affect the accuracy of the reading. Additionally, for large bearings with an outer diameter of 400mm or more, it’s recommended to let the bearing rest on a platform overnight to reach thermal equilibrium with the surrounding environment. This ensures that the clearance measurement reflects the actual operating conditions. Proper clearance measurement is essential for maintaining the efficiency and reliability of mechanical systems. Always follow standardized procedures and use calibrated tools to ensure accurate results. **Related Articles:** - KOYO Bearing Selection Considerations - How to Choose Clearance for Imported Bearings - FAG Bearing Failure Reasons and Proper Usage - Smooth Bearing Intention and Transmission Fault Analysis Previous: Rolling Bearing Vocabulary (2) Next: NSK Bearing Fit and Load Type Contact

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