Tuesday 2nd January 2018

Rollvis Roller screw transmits 4 x thrust

ABSSAC has been the UK distributor for Rollvis satellite roller screws for many years and over that time they have successfully placed the product in numerous applications.  Recently, satellite roller screws were required to replace recirculating ball screw designs within a pharmaceutical application.  The application involved the enhanced manufacture of tablet form medication, but required precision axial movement as well as greatly increased axial thrust.  The existing design was limited by physical space in which the product could operate, which had meant that a larger ball screw design could not be used to overcome the high axial thrust requirement.

Using the standard Rollvis RV series, meant that the physical roller screw's nut diameter could in fact be significantly smaller than the original ball nut design, which translated into less unit cost. The satellite roller screw product has precision rollers instead of ball bearings in the nut housing. The rollers transmit the load between the nut and the screw and since the rollers are constantly engaged with the threads of the screw, results in a high number of contact points, which ultimately, allows the satellite roller screw to support heavier axial loads. Interestingly, when the screw turns, the satellite rollers move as the lead on the screw and the rollers do not move axially relative to the nut and are not recycled. Additionally, roller screws have much greater longevity and can enable up to 4 times the axial thrust capacity for the equivalent sized ball nut screw design.

Web link to roller screws