Planetary roller screw drive for converting relative rotation between nut and screw into axial relative displacement, has planetary units whose end sections are arranged on sides of middle-portion, where one of sections is supported on nut

摘要

The drive has a threaded spindle (1) provided with a screw thread (16). Multiple planetary units (3) are provided with feed grooves (13) and guide grooves (14, 15), which are in intervention with respective nut-side grooves (6, 7). The feed grooves are in intervention with the screw thread. Each planetary unit comprises a middle portion (10) provided with the feed grooves and end sections (11, 12) that are arranged on two sides of the middle-portion. One of the end sections is axially and radially supported on the nut, where the nut is made of a metal sheet using a reforming procedure.