The load transfer elements between the screw and nut are called:
Planets
Rollers
Satellites
All of the above
The main elements of a roller screw assembly are:
Screw, spindle, journal
Screw, nut, planets
Cage, nut, gothic arch
Convex flank, threads, retaining ring
Planetary screws are normally identified by:
Screw diameter and lead
Screw pitch and flank angle
Nut diameter and number of rollers
Flange diameter and roller thread pitch
Recirculating planetary screws do not include:
A spacer ring
A ring gear
A nut body
Grooved rollers
Preloaded nuts eliminate:
Thread interference
Thrust forces
Spacer ring rotation
Backlash
Compared to ball screws, planetary screws have a:
Shorter life
Lower efficiency
Recirculation tube
Lower load rating
