Skip to main content

Engineering Information

Home ... Engineering Information... Miniature & Small ball bearings... Some Bearing Damages and Protection

Miniature & Small ball bearings -Some Bearing Damages and Protection

If the equipment assembled with ball bearings did not work right, or if the ball bearings themselves were damaged, root causes of the failure can be determined by looking at the condition of the bearings. Higher performance and longer life can be achieved by preventing the damage. Some common failure modes and preventive methods against them are described below.


Abnormal Conditions

Failure modes Major causes Solutions
Rotation issue Unable to rotate or hard to rotate Grease (amount, type) reviewing grease, improving (increasing drive force) drive system (motor)
Contact of parts reviewing process and design
Grease degradation (wear particles) reviewing lubricants, increasing grease fill amount, reviewing grease type
Flaking (flaking caused by metal fatigue) reviewing load and rotation conditions, selecting larger size bearing
Noise Continuous sounds Resonance of components reviewing dimensions (thickness) and materials of components
Brinells on the raceways reviewing handling and assembly of the bearings, Reviewing transportation process of the equipment
(excessive load and shock loads)
Contamination dents on the raceways changing designs to sealed type,
reviewing working environment
Intermittent sounds Insufficient preload reviewing preload amount from load and rotation conditions
Contamination dents changing designs to sealed type,
reviewing working environment
Dents on balls reviewing process and working environment (contamination, excessive load)
Large vibration Large internal clearance decreasing internal clearance
Improper preload reviewing preload amount from load and rotation conditions
Misalignment reviewing process, dimensional tolerance, cleanliness of the components
Deformation of the raceways reviewing precision (roundness) of shafts or housings,
reviewing glue and glue process
Temperature increase Improper grease type and amount reviewing grease
Excessive load reviewing load resistance capability and fits
Grease leak Improper grease type and amount reviewing grease
Improper selection of shield and seal reviewing seal and shield
Damage of plastics (Cracking) Chemical attack reviewing lubricants, reducing stress,
changing the plastic material
Excessive interference reviewing fits
Weld line reviewing molding conditions and gate positions

Damages

Damage conditions Causes Solutions
Flaking(flaking by metal fatigue)
 
Excessive load reviewing bearing size and load conditions
Improper assembly reviewing assembling precision, dimensions of shafts and housings
Dysfunctional lubricants reviewing lubricant type and amount
Dents(brinelling)
 
Excessive load applied during assembly Careful handling
Shock loads applied during handling
Rough surface
 
Contamination reviewing process and working environment
Dysfunctional lubricants reviewing lubricant type and amount
Creeping
 
Insufficient interference reviewing the fit and interference
Electric corrosion
 
Melting caused by electricity conducted inside the ball bearings setting up insulation and grounding wire

Go back to of this page

Home ... Engineering Information... Miniature & Small ball bearings... Some Bearing Damages and Protection