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Tractor motor of a railway vehicle

Special Cylindrical Roller Bearing for Railway Traction Motors



  • Traction motor for railway vehicles


  • Frequent bearing failures on the non-locating side due to overheating


  • Technical root cause analysis
  • Improving bearing performance
  • Increasing operational safety

NKE Solution:

  • Elimination of glass fibre insulation → better heat dissipation
  • Re-Definition of sideplay of the labyrinth sealing system
  • Raising radial clearance to C4H
  • Introduction of electrically insulated bearings
  • No change of adjacent parts required due to customized bearing dimensions


  • No bearing failures since conversion to NKE special bearings

More information about NKE bearings for railway applications