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An international manufacturer of elevator gearboxes was experiencing unscheduled failures on its product during operation. NSK investigated the bearings within the application and found that a complex and difficult to assemble bearing arrangement was causing the inconsistent and inadequate performance. NSK suggested a much simpler solution featuring a fully integrated bearing assembly unit. This two-row flanged bearing unit reduced the number of components, was easier to assemble and offered superior performance compared to the original assembly.

Key Facts

  • Elevator gearbox manufacturer
  • Irregular and unscheduled downtime
  • Failures through complex and often incorrect assembly of bearings and components
  • Need for greater performance and increased service life
  • Testing of NSK flanged bearing units
  • Approval of solution after successful testing
  • Result: reduced downtime and maintenance work
  • Elevator gearbox
Flanged Bearing for Gearboxes
  • NSK flanged bearing unit

Value Proposals

  • NSK’s investigation showed that problems arose during installation of the bearings
  • NSK training of employees in the installation and removal of bearings
  • Machine design consultancy proposed NSK integrated flanged bearing unit
  • Reduction of assembly and maintenance cost
  • Increased bearing performance and reliability
  • Annual cost savings of approx $111,200

Product Features

  • 40° contact angle for high axial forces
  • Compact design
  • Specially developed seal material for gear oil
  • Negative operating clearance
  • Lifetime lubrication
  • Housing sealed by O-Ring

Cost Saving Breakdown

Before Cost p.a. NSK Solution Cost p.a.
Bearing costs (incl. parts)
Original Assembly
$181,110 Bearings Costs
New NSK flanged bearings
Assembly costs (approx. 466h x $37.50/h) $17,475 Assembly costs (approx. 116h x $37.50/h) $4,350
Maintenance Cost $160, 742 Maintenance Costs $0
Total Costs $359,327 $248,127



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