A Two-output Planetary Roller Screw

Abstract

The invention relates to a two-output planetary roller screw, which belongs to the design field of planetary roller screws; 1 cam, 2 cross roller bearings and 2 sets of rollers; n rollers are evenly distributed on the outer wall of the screw along the circumference; the inner ring gear is set on the outer wall of n rollers; 2 cams are fixedly set on the rollers The outer walls at both ends of the axial direction; the nuts are set on the outer walls of the n rollers; the flexible bearings are correspondingly set between the outer wall of the cam and the inner wall of the nut; two flexible splines are arranged coaxially and symmetrically on the axial outer ends of the two cams; The circumferential outer wall of the flexspline is geared to the inner wall of the nut; two cross roller bearings are arranged coaxially and symmetrically on the axially outer end of the flexspline; each set of rollers is correspondingly arranged between the outer wall of the cross roller bearing and the inner wall of the nut; The invention converts high-speed rotation input into linear movement with large reduction ratio and rotation output with large reduction ratio, and realizes linkage to meet the needs of different applications.

Description

technical field [0001] The invention belongs to the design field of a planetary roller screw, and relates to a two-output planetary roller screw. Background technique [0002] As a precision transmission mechanism that combines planetary transmission and thread transmission, the planetary roller screw has high rigidity, large reduction ratio, high reliability, and flexible design (in principle, any lead can be realized, unlike a ball screw that is limited by steel balls. Size) and other characteristics, it has become the first choice for aerospace heavy-duty precision transmission mechanisms. At present, planetary roller screws mainly include RV standard type, RVI reverse type, PWG differential type, circulating type, bearing type, etc., usually only have one degree of freedom output (screw rotation input, nut linear output or nut rotation, screw linear output), did not achieve multi-degree-of-freedom large reduction ratio linkage output, and at the same time, planetary rol...

AI Technical Summary

Problems solved by technology

At present, planetary roller screws mainly include RV standard type, RVI reverse type, PWG differential type, circulating type, bearing type, etc., usually only have one degree of freedom output (screw rotation input, nut linear output or nut rotation, screw linear output), did not achieve multi-degree-of-freedom large reduction ratio linkage output, and at the same time, planetary roller screws generally use pre-stretching for the screw to suppress thermal displacement and absorb thermal displacement caused by temperature rise, but There is no pre-stretching for the rollers, which affects the accuracy of the roller transmission

Images