Analysis and Troubleshooting of Abnormal Sounds in KOYO Motor Bearings

Source: Bearing Network | Date: April 30, 2013

KOYO motor bearings are widely used in various industrial applications due to their high precision and durability. However, abnormal sounds can occur, which may indicate underlying issues that need immediate attention. Understanding the causes and solutions for these noises is essential for maintaining the performance and lifespan of the bearings.

1. Continuous "Blessing Profit..." Sound

This sound is typically caused by oscillation between the bearing cage and rolling elements. It can be triggered by improper lubrication or excessive clearance. To resolve this issue:

A. Ensure consistent and proper lubrication.
B. Use bearings with reduced clearance or apply a preload.
C. Reduce torque load and minimize device errors.
D. Choose high-quality grease that suits the application.

2. Continuous "Buzzing..." Sound

This noise often occurs during no-load operation and resembles a buzzer. It can be caused by axial imbalance or misalignment. Key features include irregular vibrations and unstable oscillations. Solutions include:

A. Use smooth and effective grease.
B. Apply preload and reduce mechanical errors.
C. Select bearings with smaller radial clearance.
D. Improve the rigidity of the bearing housing.
E. Enhance the self-alignment capability of the bearing.

3. Rust and Corrosion Sounds

Rust on the bearing surface is often due to paint or oil drying on the outer race. This can lead to corrosion, especially in harsh environments. To prevent this:

A. Ensure proper drying of the rotor and casing.
B. Control motor temperature.
C. Use custom paint types that resist corrosion.
D. Maintain a stable ambient temperature around the bearing.
E. Avoid using oils that promote rust, such as silicone or mineral oil.
F. Implement vacuum dipping processes to protect the bearing.

4. Impurity-Related Noise

Unusual sounds caused by dirt or contamination in the bearing or grease can be irregular and intermittent. To address this:

A. Use high-quality grease.
B. Improve cleanliness before applying grease.
C. Enhance the sealing function of the bearing.
D. Maintain a clean installation environment.

5. High-Frequency "Ding-Ding..." Sound

This sound is often related to the speed of the bearing and may be caused by surface waviness. To reduce this noise:

A. Improve the quality of the raceway surface and reduce waviness.
B. Minimize scratches or dents on the bearing components.
C. Adjust the clearance and preloading properly.
D. Increase the precision of the shaft and bearing housing.

6. Temperature Rise Issues

Excessive heat in the bearing can result from over-lubrication, tight clearance, or mechanical misalignment. To manage this:

A. Use the correct type and amount of grease.
B. Adjust clearance and preloading appropriately.
C. Improve the accuracy of the bearing housing and installation method.
D. Optimize the sealing system to prevent overheating.

7. Poor Feel in the Bearing

When manually rotating the rotor, a rough or obstructed feel inside the bearing may indicate internal damage or incorrect fit. Common causes include:

A. Excessive clearance between the inner ring and shaft.
B. Inappropriate fit between the inner diameter and shaft.
C. Damage to the raceway.

To fix this:

A. Adjust the clearance to an optimal level.
B. Choose appropriate bearing fits.
C. Improve manufacturing accuracy and reduce raceway damage.
D. Use suitable grease that enhances performance.

Related Bearing Knowledge:

Abnormal Surface Conditions in Deep Groove Ball Bearings
Solution 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.

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