MENU Buscar NSK - Motion & Control
Damage Condition Possible Causes Countermeasures
Cracks in the raceway ring and rolling elements. Continued use under this condition leads to larger Cracks or Fractures.
  • Excessive interference
  • Excessive load, shock load
  • Progression of Flaking
  • Heat generation and Fretting caused by contact between mounting parts and raceway ring
  • Heat generation due to Creep
  • Poor taper angle of tapered shaft
  • Poor cylindricality of shaft
  • Interference with bearing chamfer due to a large shaft corner radius
  • Correct the interference
  • Check the load conditions
  • Improve the mounting method
  • Use an appropriate shaft shape

 

Click a photo to enlarge it

Cracks 1

Part: Outer ring of a double-row cylindrical roller bearing
Symptom: Thermal cracks occur on the outer ring side face
Cause: Abnormal heat generation due to contact sliding

Cracks 2

Part: Roller of a tapered roller thrust bearing
Symptom: Thermal cracks occur at large end face of roller
Cause: Heat generation due to sliding with the inner ring rib under poor lubrication

Cracks 3

Part: Outer ring of a double-row cylindrical roller bearing
Symptoms: Cracks propagated outward in the axial and circumferential directions from the Flaking origin on the raceway surface
Cause: Flaking from a flaw due to shock

Cracks 4

Part: Outer ring of a double-row cylindrical roller bearing used for outer ring rolling (Outer ring rotation)
Symptom: Cracks on outside surface
Cause: Flat Wear and heat generation due to non-rotation of the outer ring

Cracks 5

Part: Raceway surface of outer ring of damage “Cracks 4”
Symptom: Outside surface crack propagating to the raceway

Cracks 6

Part: Inner ring of a spherical roller bearing
Symptom: Axial Cracks on raceway surface
Cause: Large fitting stress due to temperature difference between shaft and inner ring

Cracks 7

Part: Cross section of cracked inner ring of damage “Cracks 6”
Symptom: Origin is directly beneath the raceway surface

Cracks 8

Part: Roller of a spherical roller bearing
Symptom: Axial Cracks on rolling surface

Cookies no site da NSK

Nós usamos cookies para garantir que nós damos-lhe a melhor experiência em nossos sites e aplicações web. Ao continuar sem alterar as configurações do navegador, vamos supor que você deu o seu consentimento para receber cookies. No entanto, você pode alterar a configuração de cookies do navegador a qualquer momento.