**Koyo Bearing Operating Temperature Causes and Noise Troubleshooting**
Home > Bearing Knowledge > Koyo Bearing Work Hot Cause and Noise Treatment
Source: Bearing Network | Time: June 20, 2014
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**Causes of Excessive Heat in Koyo Bearings**
1. **Temperature and Installation**: The initial temperature at which the bearing is installed must be within acceptable limits. Ensure that the selected Koyo bearing is appropriate for the application and does not exceed its design capabilities.
2. **Precision and Environmental Factors**: Check if the bearing’s precision meets the required specifications. Ensure that it is not damaged and that environmental factors like dust or contaminants do not enter the bearing.
3. **Preload Adjustment**: When installing the bearing, ensure even preloading. Avoid over-tightening, as this can reduce internal clearance and lead to increased friction and heat.
4. **Lubrication and Cooling**: Poor lubrication selection, such as using an oil or grease with incorrect viscosity, can cause excessive heat. Ensure the lubrication system is properly configured and that the bearing has adequate cooling.
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**Noise Troubleshooting for Koyo Bearings**
Bearings naturally produce noise due to the rolling motion of the elements along the raceway. This is a normal characteristic of all bearings. However, certain types, such as spherical bearings, may have irregular rolling patterns, and their noise frequency does not always match the rotational speed. As the speed increases, the total sound pressure level also rises.
For bearings with high rolling noise, the sound pressure level of the raceway decreases with higher viscosity. However, for bearings with low rolling noise, the sound pressure level may initially decrease but then increase once the viscosity reaches about 20 mm²/s or more. A stiffer bearing housing can help reduce the overall noise level.
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**Impact Noise and Control Methods**
In larger ball bearings or cylindrical roller bearings operating under low-speed radial loads, the rolling elements may experience uneven movement due to centrifugal forces. As the rotational speed increases, this issue usually disappears. To control impact noise, adjust the radial clearance appropriately, use a suitable cage design (such as a spherical cage), and ensure proper alignment and harmonization of components.
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**Rolling Noise and Its Solutions**
Cylindrical roller bearings may produce sharp metallic noises under certain conditions. These sounds are more common in larger grease-lubricated bearings and less likely in oil-lubricated ones. Rolling noise tends to occur more frequently in winter, especially when the bearing is under pure radial load and has a large radial clearance. It can also vary depending on the bearing type and rotational speed.
To minimize rolling noise, consider special processing of the outer ring raceway, use appropriate bearings, adjust the radial clearance if necessary, apply high-quality grease, and improve the rigidity of the surrounding components.
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**Related Bearing Knowledge**
- Analysis of the development status of new product fan bearings
- Skills required for oil-free bearing-mold occupation
- Removal, inspection, and repair of KOYO bearings
- Analysis of linear bearing series
- Analysis of cylindrical roller bearings
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This article was originally published on China Bearing Network. Please visit [http://www.chinabearing.net](http://www.chinabearing.net) for more information.
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