Text version of the page

screw drives

3.1.Spiracon™ Roller Screw

3.1.1.Spiracon™ Roller Screw Overview

Spiracon™ is a planetary roller screw, which converts rotary motion to linear movement. It is a unique concept, invented and patentedby Illinois Tool Works, USA, and developed by and licensed solely to Power Jacks Ltd. Principle of Operation The Spiracon™ system consists of a multi-start screw with an involute thread form and a number of planetary rollers with annulargrooves, which engage with the screw. These rollers also engage with a grooved load bearing element, which transmits the load throughroller thrust bearings, to the nut housing. The rolling action results in a high efficiency mechanism, while the line contact and hardenedand ground construction achieves a high dynamic load carrying capacity, together with almost no axial backlash or wear.
NutHousing Needle Roller BearingRoller ThrustBearing Wiper Seal Load BearingElement Spiracon™Roller Screw Main Features of Spiracon™ Roller Screws •High dynamic load capacity•High efficiency•High positional accuracy•Long life and low maintenance•Same nut fits both right and left handed screws•Hardened and ground rolling elements•Clean operation •Low noise.

2

section three