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Tapered Roller Bearing Damage Analysis 2

 Let's continue to analyse the Tapered Roller Bearing Damage :

Corrosion / etching:

1. Etching — Rusting with pitting and corrosion from moisture/water exposure.

2. Staining — Surface stain with no significant corrosion from moisture exposure.

3. Line spalling — Roller-spaced spalling from bearings operating after etching damage.

Improper fit:

1. Cone bore damag---Fractured cone due to out-of-round or oversized shaft.

2. Cup spinning — Loose cup fit in a rotating wheel hub.


Electric current:

1. Electric arc pitting — Small burns created by arcs from improper electric grounding while the bearing is stationary.

2. Fluting — Series of small axial burns caused by electric urrent passing through the bearing while it is rotating.


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


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

False brinelling:

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

True brinelling:

Damage from shock or impact.

Handling damage:

1. Roller spaced nicking — Raised metal on races from contact with roller edges.

2. Roller nicking/denting — Rough handling or installation damage.

3. Cup-face denting — Indentations from hardened driver.

Excessive preload or overload:

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.

Excessive end play:

1. Scalloping — Uneven localized wear resulting from excessive end play.

2. Cage pocket wear — Heavy contact between the rollers and cage pocket surfaces caused by bearing operating too loosely.

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