The recirculating RGTR has a mechanical recirculation of the threades planets. This kinematic (recirculation) allows for the realisation of screws with small thread leads, but still with robust and load-bearing thread profiles. This also allows for smaller thread leads on spindles with large nominal diameters. The threaded planets are held in position by a cage on the circumference of the spindle, similar to how needles are held in place in a needle rolling bearing. After one rotation of the cage, the threaded planets are radially lifted out of the spindle thread into a recess in the spindle nut by cams. In this recess, the thread roll is then returned (recirculated) axially by one thread turn on the threaded spindle.
Spindle nominal Ø: 8 mm to 125 mm
Total spindle length: up to 10 m max.
Leads: 0.5 mm to 5 mm
Dynamic load ratings: up to Cdyn 800 kN
Static load ratings: up to Cstat 3,400 kN
Recurculating planetary roller screws are basically used wherever an electromechanical linear drive with high precision, repeatability and high load capacity with a small lead is required. The small leadscrew leads allow for very high positioning accuracy under the effect of comparatively high loads.
The field of application of the RGTR includes e.g.:
- High-precision positioning applications of optical instruments in space and aerospace technology
- Valve control technology in the oil industry
- Hexapod robot drives and kinematics
Various threaded nut designs are available with different mounting options. If preloading of the planetary roller screws is desired, it can be achieved with single-piece ground-to-fit or two-piece nut halves that are preloaded against each other. This is the reason for the subdivision of the threaded nuts into so-called "preloaded" and "non-preloaded" in the threaded nuts product key.
Product key
