Common Faults and Solutions of Deep Groove Ball Bearings
Release time:
2025-06-12
Common Faults and Solutions of Deep Groove Ball Bearings
Common Faults and Solutions of Deep Groove Ball Bearings
I. Overheating (Abnormal Temperature Rise)
Fault Manifestation: During operation, the bearing temperature exceeds the normal range (usually ≤ 80℃), feels hot to the touch, or shows abnormal readings on temperature measurement instruments.
Common Causes:
Poor Lubrication: Insufficient lubricating oil, incorrect type, or deterioration due to aging, leading to increased friction.
Over-tight Installation: Excessive interference fit, squeezing the bearing clearance too small, increasing rotational resistance.
Excessive Load: Axial or radial loads exceed the rated range, causing excessive friction between the rolling elements and raceways.
Insufficient Cooling: High ambient temperature or poor heat dissipation conditions, preventing heat from dissipating in time.
Solutions:
Check the lubrication status, replenish or replace suitable lubricating oil (such as lithium-based grease, synthetic oil), and clean the lubrication channels.
Recheck the installation dimensions, adjust the interference fit, and ensure the bearing clearance meets the standard.
Verify the load conditions, avoid overloading, and replace with a bearing of higher load capacity if necessary.
Improve the cooling environment, add cooling devices (such as fans) or lower the ambient temperature.
II. Abnormal Noise (Strange Sounds, Vibration)
Fault Manifestation: During operation, sharp, jerky, or periodic noises are emitted, accompanied by increased vibration.
Common Causes:
Wear or Damage: Scratches, spalling, or cracks on the raceway or rolling element surfaces, causing impacts during rotation.
Foreign Object Intrusion: Dust, metal debris, etc., enter the bearing, disrupting the normal movement of the rolling elements.
Misalignment: The bearing axis does not align with the shaft or housing axis, causing eccentric loading.
Improper Clearance: Insufficient clearance increases friction, while excessive clearance intensifies vibration.
Solutions:
Disassemble the bearing to inspect the internal parts. Replace with a new bearing if wear is severe; for minor wear, grinding repair can be done (only for non-precision applications).
Clean the bearing and installation area, and install sealing devices (such as dust covers, seals) to prevent foreign object intrusion.
Correct the installation position, using precision instruments (such as dial indicators) to adjust the coaxiality and perpendicularity.
Select bearings with appropriate clearance based on the operating conditions (e.g., C3 clearance is suitable for high-temperature or high-speed scenarios).
III. Bearing Lockup (Inability to Rotate)
Fault Manifestation: The bearing is completely immobile or rotates with extremely high resistance.
Common Causes:
Severe Lubrication Failure: The lubricating oil dries up or carbonizes, causing a "seized shaft" phenomenon.
Overload Deformation: Sudden impact loads cause deformation of the raceway or cage, trapping the rolling elements.
Thermal Expansion Lockup: High operating temperature causes the bearing to expand and lock with the shaft or housing.
Cage Damage: Cage fracture or deformation, causing the rolling elements to scatter or squeeze each other.
Solutions:
Disassemble and clean the dried-up lubricant, inspect the damage to the parts, and replace the damaged components and re-lubricate.
Identify the load source, avoid impact loads, and install buffer devices (such as elastic couplings) if necessary.
Control the operating temperature, check the cooling system, and select bearings made of high-temperature resistant materials (such as ceramic ball bearings).
Replace the cage or the entire bearing to ensure the cage material matches the operating conditions (e.g., steel cages are suitable for heavy loads).
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