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Introduction

A modern car wash in Germany cleans more than 110,000 cars p.a. The rotating unions for the washing heads failed due to ingress of water - the grease had been washed out. The maintenance was carried out by in-house staff. NSK identified that the current DGBB's were not suitable for this purpose. NSK proposed to change from the existing VV sealing arrangement, to Molded Oil bearings with DDU seals. After this change the bearings rotation unions were running without any problems.

Rotating Unions
  • Car Wash - Rotating Unions
Molded-Oil DGBB
  • Molded Oil Deep Groove Ball Bearings

Key Facts

  • In a modern German car wash bearings in the rotating unions failed
  • The maintenance was carried out by in-house staff
  • The grease was washed out of the bearings and they tend to get rusty
  • NSK proposed the use of Molded Oil bearings with DDU - double contact seals
  • After the change to Molded Oil bearings no further unplanned stoppages occured

Value Proposals

  • The customer experiended rusty bearings which failed bearings in the rotating union of a car wash
  • NSK investigated the reason for the bearing failure
  • The bearings had direct contact to the water of the car wash
  • The grease was washed out of the bearings
  • NSK suggested to use Molded Oil bearings with DDU sealing
  • With the new bearings the car wash had no further unplanned stoppages

Product Features

  • Available for wet applications
  • Available in ball bearing, spherical roller bearing and tapered roller bearings types
  • Rust-proof - Stainless steel for corrosive environments
  • Grease-free property with no oil refilling keeps operating environments clean
  • Operating life more than twice as long as grease lubrication, in water or dustcontaminated environments
  • Contact-seal type available in standard inventory for ball bearings
  • Achieves extended maintenance-free performance as Molded-Oil provides a continuous supply of lubricant
Cost Saving Breakdown
Before Cost p.a. NSK Solution Cost p.a.
Bearing Costs € 12 250 Bearing Costs € 618
Engineering Costs € 38 Engineering Costs € 0
Costs of lost production € 262 Costs of lost production € 0
Other Costs Other Costs
Total Costs € 12 550 € 618

Reference:SS-E-1-752