Rotating nut roller screws SRR / BRR

Concept

The main purpose of this solution is to minimize the inertia phenomenon associated with long rotating shafts. SKF offers a range of satellite roller screws with the nut supported by bearings fitted inside a steel housing. The electric motor drives the nut via a tension belt, and the nut assembly moves along the fixed screw shaft.

Features and benefits

  • 72 series angular contact bearings are directly mounted on the nut outer diameter
  • Bearings are preloaded in back-to-back arrangement in order to fully support the moment created by the belt tension
  • 2 Nilos rings protect the bearings against pollution and permit lubrication for life
  • Wipers are mounted at each end of the nut in the standard configuration for better protection against contamination
  • The screw assembly is lubricated through a nipple mounted on the housing external diameter with standard SKF LGEP2, or according to customer specifications
  • SRR version with axial play
  • BRR version with backlash elimination
  • Compact solution ready for use in machinery
  • Simplified engineering for machine builders

Technical data

Nominal diameter
from 25 to 60 mm
Lead
from 5 to 30 mm
Basic dynamic load capacity
and lead combination
Please contact SKF for this data that is function of diameter
Basic static load capacity
and lead combination
Please contact SKF for this data that is function of diameter
Acceleration
up to 12 000 rad/s2     
Maximum speed n x d0
up to 160 000

Typical applications

  • Production processes in automotive industry (servo-presses, tube bending, forming, locking devices etc.)
  • Process in injection moulding industry (part ejection) 
  • And many other applications
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