Compact rollers

January 31, 2021
Remington Style Curl Envy
The SKF lightweight inverted roller screw signifies a distinctive design variant regarding the planetary roller screw. This design provides effective electromechanical actuation, when compactness and high load ability tend to be requirements.
The compact inverted roller screw works on the same concept as a planetary roller screw, using the roller's rotation being synchronized using threaded shaft through toothed bands. Either fan or shaft may be driven by an electric powered engine, the non-rotating element thus acting because the pole of an actuator. The application form loads performing on the translating pole transit through planetary rollers into rotating shaft or nut. Toothed bands and guides make sure the rolling movement and a much circumferential position regarding the rollers, for perfect load circulation also to expel any parasitic rubbing between rollers.

Functions and advantages

  • Stroke according to nominal diameter. Kindly consult SKF
  • Standard lead precision G5 (ep=25µm/300mm)
  • High rotational rate based screw nominal diameter: N.d0 max = 160000
    (as an example, 4100 RPM for screws with nominal diameter 39 or 8888 RPM for screws with moderate diameter 18 mm; could possibly be higher for smaller dimensions shaft. Kindly consult SKF)
  • ISR variation with axial play
  • IBR with backlash elimination by oversized rollers
  • Really small lead down to 2, 4 mm, while supplying a high load carrying capacity and large axial tightness (for smaller leads be sure to consult SKF)
  • High-speed capability
  • Guiding and sealing features effortlessly integrated on smooth area of fan or shaft, leading to high performance sealing
  • Compactness, low body weight and decreased number of parts in overall consumer system
  • Customized attachment between electric rotor and screw components, and easy rotor integration
  • Screw or fan right used as push tube of this actuator
  • Paid down needs for electric motor torque to achieve large load actuation
  • Long solution life and enhanced reliability increasing client installation output
  • Option of personalized designs
  • Low backdriving ability as well as self locking solutions tend to be possible

Specialized data of ISR / IBR standard range

Nominal diameter
from 18 to 48 mm
from 2, 4 to 6 mm
Basic dynamic load capability
as much as 259kN
Basic static load capacity
to 559 kN
up to 12 000 rad/s2

Typical programs

  • Electromechanical cylinders
  • Vehicle system outlines (place welding, gluing, crimping, riveting etc.)
  • Factory automation
  • Oil and gas
  • Aerospace
  • And lots of various other applications
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