NSK Rolling Bearing Surface Wear Resistance:False Brinelling

   
    Rolling bearing (rollingbearing) is a precision mechanical element that changes the sliding friction between the running shaft and the shaft seat into rolling friction, thereby reducing friction loss.
   
    Rolling bearings are generally composed of four parts: inner ring, outer ring, rolling body and cage. The function of the inner ring is to cooperate with the shaft and rotate with the shaft; the outer ring is to cooperate with the bearing seat and play a supporting role; In the cage, the rolling elements are evenly distributed between the inner ring and the outer ring, and their shape, size and number directly affect the performance and life of the rolling bearing; the cage can evenly distribute the rolling elements and guide the rolling elements to rotate for lubrication.

When a rolling bearing is damaged during machine operation, the entire machine or equipment can seize or malfunction. Since bearings that fail prematurely or unexpectedly cause trouble, it is important to be able to identify and predict failure beforehand, so that preventive measures can be adopted.

Damage Condition

Among the different types of Fretting, false brinelling is the occurrence of hollow spots that resemble brinell dents and are due to Wear caused by vibration and swaying at the contact points between the rolling elements and raceway.

Possible Causes

· Oscillation and vibration of a stationary bearing during such times as transporting
· Oscillating motion with a small amplitude
· Poor lubrication

Countermeasures

· Secure the shaft and housing during transporting
· Transport with the inner and outer rings packed separately
· Reduce the vibration by preloading
· Use a proper lubricant
 

False Brinelling 1

Part: Inner ring of a deep groove ball bearing
Symptom: False brinelling on the raceway
Cause: Vibration from an external source while stationary

 

Eric Good production Quality online NSK 6907DU

False Brinelling 2

Part: Outer ring of damage “False Brinelling 1”
Symptom: False brinelling on the raceway
Cause: Vibration from an external source while stationary


 

Eric Good production Quality online NSK 608DD

 
 

False Brinelling 3

Part: Outer ring of a thrust ball bearing
Symptom: False brinelling of raceway surface at ball pitch
Cause: Repeated vibration with a small oscillating angle


 

Eric Good production Quality online NSK 6220DU
 

False Brinelling 4

Part: Rollers of a cylindrical roller bearing
Symptom: False brinelling on rolling surface
Cause: Vibration from an external source while stationary



  
Eric Good production Quality online SKF 62072Z