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Bearing Fatigue Identification               Click on images to enlarge them

Thanks to the Timken Company.

Akron Gear and Bearing Distributors can supply you with a complete line of Timken parts.

 

bullet Fatigue Spalling
bullet Foreign Material
bullet Inadequate Lubrication
bullet Corrosion / Etching
bullet False Brinelling
bullet Handling Damage
bullet True Brinelling
bullet Improper Fit
bullet Excessive Preload or Overload
bullet Cage Damage
bullet Peeling
bullet Misalignment
bullet Excessive End Play
bullet Electric Current
bullet High Spots In Cup Seats
 

Fatigue Spalling   (Back to the top)

Geometric Stress Concentration

Spalling from misalignment , deflection or heavy loading.

Inclusion Origin

Spalling from oxides or other hard inclusions in bearing steel.

Point Surface Origin

Spalling from debris or raised metal exceeding the lubricant film thickness.

Abrasive Wear

Fine abrasive particle contamination.

Bruising

Debris from other fatigued parts, inadequate sealing or poor maintenance.

Grooving

Large particle contaminationimbedding into soft cage material.

Roller End Scoring

Metal to metal contact from breakdown of lubricant film.

Cone Large Rib Face Scoring

"Welding" and heat damage from metal to metal contact.

Cone Large Rib Face Deformation

Metal flow from excessive heat generation.

Total Bearing Lock Up

Rollers skew, slide sideways and lock-up the bearing.

 

Roller End Scoring

Metal to metal contact from breakdown of lubricant film.

Cone Large Rib Face Scoring

"Welding" and heat damage from metal to metal contact.

Cone Large Rib Face Deformation

Metal flow from excessive heat generation.

Total Bearing Lock Up

Rollers skew, slide sideways and lock-up the bearing.

 

Wear caused by vibration or relative axial movement between rollers and races.


Handling Damage    (Back to the top)

Roller Space Nicking

Raised metal on races from contact with roller edges.

Roller Nicking / Denting

Rough handling or installation damage.

Cup-Face Denting

Indentations from hardened driver.


True Brinelling    (Back to the top)

Damage from shock or impact.


Improper Fit    (Back to the top)

Cone Bore Damage

Fractured cone due to out of round or oversized shaft.

Cup Spinning

Loose cup fit in a rotating wheel hub.


Excessive Preload or Overload    (Back to the top)

Rapid and Deep Spalling

Caused by unusually high stresses. Full race width fatigue spalling is caused by heavy loads creating a thin lubricant film and possible elevated temperatures.

Rapid and Deep Spalling

Caused by unusually high stresses. Full race width fatigue spalling is caused by heavy loads creating a thin lubricant film and possible elevated temperatures.


Cage Damage    (Back to the top)

Cage Deformation

Improperly installed or dropped bearing.

Roller Binding and Skewing

Cage ring compressed during installation or interference during service.


Peeling   (Back to the top)

Micro-spalling due to thin lubricant film from high loads/low RPM or elevated temperatures.

Micro-spalling due to thin lubricant film from high loads/low RPM or elevated temperatures.


Misalignment   (Back to the top)

Irregular roller path from deflection, inaccurate machining or wear of bearing seats.

Irregular roller path from deflection, inaccurate machining or wear of bearing seats.


Excessive End Play   (Back to the top)

Scalloping

Uneven localized wear resulting from excessive end play.

Cage Pocket Wear

Heavy contact between the rollers and cage pocket surfaces caused by bearing operating too loosly.


Electric Current   (Back to the top)

Electric Arc Pitting

Small burns created by arcs from improper electric grounding while the bearing is stationary.

Fluting

Series of small axial burns caused by electric current passing through the bearing while it is rotating.


High Spots In Cup Seats   (Back to the top)

Localized Spalling on the cup race from stress riser created by split housing pinch point.

Localized Spalling on the cup race from stress riser created by split housing pinch point.

 

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