1. The bearing makes a "squeaky" sound.
Cause Analysis: This sound is caused by the vibration and collision between the retainer and rolling elements, regardless of the type of grease used. It tends to be more common when torque, load, or radial clearance is high.
Solution: A. Improve the design of the retainer. B. Use bearings with smaller clearance or apply preloading. C. Reduce torque load and installation errors. D. Choose high-quality grease.
2. Continuous buzzing sound "hum-hum..."
Cause Analysis: When the motor runs without load, it produces a buzzer-like sound. There's also abnormal axial vibration, and a "beep" sound occurs when turning on or off.
Specific Characteristics: Poor lubrication is often the main issue. In winter, motors with ball bearings at both ends are commonly affected due to unstable vibrations from poor shaft alignment.
Solution: A. Use grease with excellent lubrication properties. B. Apply preloading to reduce installation errors. C. Use bearings with small radial clearance. D. Enhance the rigidity of the motor housing. E. Improve bearing alignment. Note: The fifth point is the most effective long-term solution, using 02 small groove curvature or 01 large groove curvature.
3. Paint rust causes noise.
Cause Analysis: After the paint dries, chemical components in the paint oil can volatilize and corrode the bearing’s end face, outer raceway, and rolling path, leading to corrosion and abnormal sounds.
Specific Characteristics: Corrosion affects one side more than the other.
Solution: A. Install the rotor and allow the casing to air dry. B. Reduce motor temperature. C. Choose suitable paint types. D. Improve ambient temperature for the bearing. E. Avoid oils that may cause corrosion, such as silicone or mineral oil. F. Use vacuum dipping process.
4. Abnormal sound due to impurities.
Cause Analysis: This irregular noise is caused by dirt in the bearing or grease.
Specific Characteristics: The sound appears randomly, especially on high-speed motors.
Solution: A. Select high-quality grease. B. Improve cleanliness before grease injection. C. Enhance the sealing of the bearing. D. Ensure a clean installation environment.
5. High-frequency tapping sound "tap-tap..."
Specific Characteristics: The sound frequency changes with the bearing speed, mainly caused by surface waviness.
Solution: A. Improve the quality of the bearing surface and reduce waviness. B. Minimize damage. C. Adjust clearance and fit, check free-end bearing operation, and enhance installation precision.
6. Temperature rise in the bearing.
Specific Characteristics: The bearing temperature exceeds the acceptable range after running.
Cause Analysis: A. Excessive grease increases lubricant resistance. B. Too small clearance leads to excessive internal load. C. Installation error. D. Sealing friction. E. Bearing crawling.
Solution: A. Choose the right amount of proper grease. B. Correct clearance and fit, check free-end bearing operation. C. Improve bearing housing accuracy and installation method.
7. Poor feel in the bearing.
Specific Characteristics: When manually rotating the rotor, the bearing feels rough or blocked.
Cause Analysis: A. Excessive clearance. B. Mismatch between inner diameter and shaft. C. Damage to the raceway.
Solution: A. Keep clearance as small as possible. B. Choose appropriate tolerance zones. C. Improve accuracy and reduce raceway damage. D. Select suitable grease.
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