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Introduction

An animal slaughter production line was experiencing regular failures of deep groove ball bearings used in a bleed shackle roller application which is used to transport animals along the production line. The initial bearings were replaced regularly resulting in high costs.
NSK engineers checked the application, analysed several failed bearing sets and found the cause of failure to be brinelling damage during operation.* NSK advised a different bearing type and assembly that could accommodate the impact loads seen during operation. The bearing change resulted in a significantly longer bearing operational lifetime.
* Please find information on bearing diagnostics in the NSK catalogue "New Bearing Doctor"

Key Facts

  • Bleed Shackle Roller
  • 4 Deep Groove Ball Bearings used per roller
  • Failures occured between 1 day and 14 days
  • Brinelling damage was root cause of failure
  • NSK Solution: Cylindrical Roller Bearings, two different types
  • Application lifetime significantly increased, over 6 months

Bleed Shackle Roller Bleed Shackle Roller
Cylindrical Roller Bearings - EW series Cylindrical Roller Bearings - EW series

Background Information

  • Sector: Food and Beverage
  • Country: United Kingdom
  • End-product: Beef
  • Application: Bleed Shackle Roller

  • Number of machines: 261
  • Approx. Lifetime: 1 day to 14 days
  • Problem: Brinelling damage caused by impact loading during operation that could not be avoided

Value Proposals

  • NSK engineers performed an Application Review together with a Failed Bearing Analysis
  • As a result, it was recommended to replace the deep groove ball bearings in use with cylindrical roller bearings which are more accommodating impact loading

  • A trial of NSK Cylindrical Roller Bearings in the application showed over 6 months lifetime
  • Significant reduction of replacement costs and downtimes
  • Cost savings realised

Product Features

  • High strength & wear resistant pressed steel cage
  • Cage pocket design gives superior roller guidance
  • Cage strength increased 1.5 – 2 times
  • Cage symmetry reduces noise
  • Controlled contour rollers

  • Up to 30% increase in load Rating
  • Longer operating life – up to twice the bearing life
  • 10 - 25% higher limiting speed than conventional series
  • 30 - 40% noise reduction (3 - 7dB quieter) & vibration reduction

Cost Saving Breakdown

Before Cost p.a. NSK Solution Cost p.a.
Bearing replacement costs € 26.699 Bearing replacement costs € 4.015
Downtime costs € 4.602 Downtime costs € 1.198
10 new shackles € 1.175 No costs for new shackles € 0
Total Costs € 32.476 € 5.213

Reference: SS-E-2071

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