Inverted Roller Screw (IRS)
The Inverted Roller Screw (IRS) is the exact inverse of the standard roller screw (SRS). The rollers do not move axially along the shaft and the stroke travels within a larger nut. Our solutions enable higher capacity ratings with smaller leads which reduce the driving torque, optimizing compactness and making direct guiding of the shaft possible. The IRS is available from range Ø8 mm to Ø80 mm for the screw with various leads and the nut can be customized to meet specific customer requirements.
This design is often an excellent option if you wish to design a very compact actuator with a rotating nut.
Description of the IRS, the inverted roller screw
| Lead | range from 1 to 16 for standard designs |
| Nominal Diameter | range from Ø8 to Ø150 for standard designs |
| External Diameter | range from Ø24 to Ø142 (recommended minimum values) |
| Length | range from 87 to 600 for standard designs |
| Materials | hardened steel, stainless steel |
| Hardness | 58-62 HRc (650- 750HV) |
| Lubrication | grease, oil |
| Loads | axial bidirectional |
| Dynamic capacity | up to 39% increase compared to traditional, existing designs |
| Static capacity | up to 60% increase compared to traditional, existing designs |
| Stiffness | extremely high |
| Resistance to shock | very good |
| Coatings | under request |
| Sealing | under request |
| Maintenance | very reduced |
| Contamination | design has been optimized to limit any internal contamination and wear to extend lubricant and total service life to the maximum level. |
| Parts | customizable |
