Preload
Influence of preload
Increasing the preload increases the rigidity of the guidance system. The preload influences not only the rigidity but also the displacement force of the guidance system. The higher the preload, the larger the displacement force. Furthermore, preload also influences the operating life of the guidance system.
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, for example using the damping carriage RUDS..-D for RUE or the hydrostatic compact guidance system HLE.
ACHTUNG
The approximate calculation of the equivalent static and dynamic load is based on the standard preload.
Under low load and high preload, the values for the rating life and static load safety factor may be lower than those calculated using the approximation equations for the 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 classes
Preload class | Preload setting |
|---|---|
Linear recirculating roller bearing and guideway assemblies RUE..-E | |
V1 | 0,04 · C |
V2 | 0,08 · C |
V3** | 0,1 · C |
V4 | 0,13 · C |
V5 | 0,15 · C |
Linear recirculating ball bearing and guideway assemblies KUSE | |
V0 | Very small clearance to clearance-free |
V1** | 0,04 · CII** |
V2 | 0,13 · CII** |
Linear recirculating ball bearing and guideway assemblies KUVE..-B, KUVE..-W | |
V0 | Very small clearance to clearance-free |
V1** | 0,04 · C |
V2 | 0,1 · C |
**Standard preload class.
**Basic dynamic load rating CII in tensile direction.