Determination of Bearing Clearance

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Measuring the clearance of a bearing is a critical step in ensuring its proper performance and longevity. This process involves precise measurements to determine the internal space between the inner and outer rings, as well as the rollers. The method varies slightly depending on whether the bearing is mounted or not. When measuring the clearance of a bearing unit, it should be placed on a flat surface. The outer ring should be pressed gently by hand to ensure it remains stable without tilting. Then, the inner ring is turned approximately half to one full rotation to position the rollers correctly. Once this is done, the upper rows of rollers are aligned for measurement. A feeler gauge is used to measure the internal clearance, with the orientation and points of measurement varying based on the bearing’s outer diameter. For bearings with an outer diameter larger than 200mm, the feeler gauge is inserted directly between the two rows of rollers above the bearing and the outer ring. It is also inserted between the left and right symmetrical rows of rollers and the inner ring to determine the internal clearance accurately. The internal clearance (R) is calculated as the average of the clearances measured from the top and bottom rows of rollers relative to the outer ring: RT = 1/2(r1 + r2) Similarly, the internal clearance on the left side (RL) and the right side (rR) are calculated using the same principle: RL = 1/2(rL1 + rL2) rR = 1/2(rR1 + rR2) Finally, the overall internal clearance of the bearing is determined by averaging these values: r = 1/2(RT + RL + rR) For bearings mounted on a shaft or sleeve, the measurement is taken when the roller is in a sagging condition. The outer ring is rotated halfway to one full turn, and the lower row of rollers is positioned to allow accurate measurement. The feeler gauge is then used to measure the clearance between the outer ring and the rollers, again depending on the bearing's outer diameter. For large bearings with an outer diameter greater than 400mm, special attention must be given to temperature conditions. Bearings that have been heated—such as those removed from an oil bath or induction heater—must be fully cooled before measurement. Temperature differences can significantly affect the accuracy of clearance readings. Additionally, when measuring, it's important to consider the ambient temperature and the thermal state of both the measuring tools and the bearing itself. If a bearing has been transported from a storage warehouse to the measurement site, it may still be warm, which could lead to incorrect readings if not accounted for. In such cases, it's advisable to let the bearing rest on a platform overnight to reach equilibrium with the surrounding environment. Proper clearance measurement ensures optimal performance, reduces wear, and extends the life of the bearing. Always follow the manufacturer's guidelines and use calibrated instruments for accurate results.

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**Related Bearing Knowledge** - KOYO bearing selection considerations - How to choose the clearance of imported bearings - FAG bearing failure reasons and smooth operation - Transmission bearing fault analysis and cleaning methods This article is linked from http:// Please reference China Bearing Network at http:// Previous: Rolling Bearing Vocabulary (2) Next: NSK Bearing Fit and Load Type Contact

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