medias® professional – Product catalogue
medias
Schaeffler
Principles
Rolling bearings
Shaft guidance systems
Track roller guidance systems
Monorail guidance systems
Preload
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Influence of preload

  

Preload increases the rigidity of the bearing arrangement (reduced deflection), the equivalent bearing load and the guidance accuracy.

  

Preload and damping

  

The damping of linear guidance systems based on rolling elements is not influenced by preload. A significant level of damping is only achieved by means of additional design measures, such as the damping carriage RUDS..-D for RUE.

  
   
achtung  

The approximate calculation of the equivalent static and dynamic load, see link, does not take bearing preload into consideration.

  
 

Under low load and high preload, the values for rating life and static load safety factor may be lower than those calculated using the approximation formulae for equivalent static and dynamic load.

  
 

The correct preload is only achieved once the guidance system is completely assembled (due to deflection of the back of the carriage).

  
   

Preload class
and suitable applications

  

Preload class
 Preload setting
 Suitable applications
Linear recirculating roller bearing and guideway assemblies RUE..-D, RUE..-E (-L-KT)2)
V3
 0,1 · C
  • High alternating load
  • Particularly high rigidity
  • Moment load
Linear recirculating ball bearing and guideway assemblies KUSE
V1
 0,04 · CII1)
  • High rigidity
  • Moment load
V2
 0,13 · CII1)
  • Alternating load
  • Particularly high rigidity
  • Moment load
Linear recirculating ball bearing and guideway assemblies KUVE..-B (-KT)2)
V1
 0,04 · C
  • High rigidity
  • Moment load
V2
 0,1 · C
  • Alternating load
  • Particularly high rigidity
  • Moment load
Linear recirculating ball bearing and guideway assemblies KUE
V0
 Very small clearance
to clearance-free
  • Smooth-running
  • Moment load
V1
 Clearance-free
  • High rigidity
  • Moment load

 
 
______
 1    Basic dynamic load rating CII in tensile direction.
 
 
 2    Other preload classes available by agreement.
 
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