KOYO Motor Bearing Abnormal Sound Analysis and Troubleshooting
Source: Bearing Network | Date: April 30, 2013
KOYO bearings are widely used in motor applications due to their high performance and reliability. However, under certain conditions, they may produce abnormal sounds that can affect the operation of the motor. Understanding these noises and how to address them is essential for maintaining system efficiency and prolonging bearing life. 1. **Continuous "Blessing Profit..." Sound** This sound often occurs due to vibration between the bearing cage and rolling elements. It may be caused by improper clearance, excessive load, or radial misalignment. **Solutions:** - Ensure proper installation and alignment. - Use bearings with reduced clearance or apply preload. - Reduce torque load and minimize mechanical errors. - Choose high-quality lubricants suitable for the application. 2. **Continuous "Humming" Sound** This noise typically appears during no-load operation and is similar to a buzzing sound. It may be caused by axial oscillation, poor alignment, or uneven loading. **Solutions:** - Use smooth and functional grease. - Apply preload and reduce mechanical errors. - Select bearings with smaller radial clearance. - Improve housing rigidity and ensure good self-alignment of the bearing. - For better performance, choose bearings with appropriate groove curvature (e.g., 02 for small curvature, 01 for larger curvature). 3. **Paint Rust Noise** This type of noise occurs when the bearing surface becomes corroded due to paint or oil residue after drying. The corrosion can lead to rust on the raceway and rolling elements. **Solutions:** - Dry the rotor and casing properly. - Control the operating temperature. - Use custom paint types designed for bearings. - Maintain an optimal ambient temperature. - Avoid using silicone or mineral oils that promote rust. - Implement vacuum dipping processes for better protection. 4. **Impurity-Related Noise** Irregular sounds caused by dirt or foreign particles in the bearing or grease. These sounds may vary in frequency and occur randomly. **Solutions:** - Use high-quality grease. - Ensure cleanliness before grease application. - Enhance the sealing of the bearing. - Maintain a clean installation environment. 5. **High-Frequency "Ticking" Sound** This sound changes with the speed of the bearing and is usually caused by waviness on the raceway surface. **Solutions:** - Improve the quality of the raceway surface and reduce waviness. - Minimize surface damage. - Adjust the clearance and preloading properly. - Enhance the precision of the shaft and bearing housing. 6. **Temperature Rise Issues** Excessive heat can be caused by over-greasing, too small clearance, mechanical misalignment, or seal friction. **Solutions:** - Use the correct amount and type of grease. - Adjust clearance and preloading. - Check the condition of the free-end bearing. - Improve the accuracy of the bearing housing and installation method. - Optimize the sealing system. 7. **Poor Feel During Manual Rotation** If the bearing feels rough or blocked when manually rotated, it could be due to excessive play, incorrect fit, or damaged raceways. **Solutions:** - Adjust the clearance to an appropriate level. - Use suitable bearing fits. - Improve manufacturing accuracy and reduce damage to the raceway. - Select the right type of lubricant. --- **Related Bearing Knowledge:** Faulty surface analysis of deep groove ball bearings and double-row deep groove ball bearings, solutions for overheating in multistage pump bearings, characteristics of linear bearings, NSK bearing inspection, and accounting analysis. This article was originally published on China Bearing Network. For more information, visit [http://](http://) Previous: "Simulation Skills of Bearings" Next: "Requirements for NTN Bearing Inner Packaging Methods and Materials"
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