Planetary roller lead-screw pair

Abstract

The invention relates to a planetary roller lead-screw pair, and belongs to the field of design of planetary roller lead-screw pairs. The planetary roller lead-screw pair comprises a nut, a right gearring, a holder, a lead screw, a left gear ring, n rollers and two locking bolts, wherein the lead screw is axially and horizontally arranged; the outer wall of the lead screw is sleeved with the holder; the n rollers are uniformly embedded into the holder in the circumferential direction, the n rollers are parallel to the axis of the lead screw, and the n rollers are in threaded fit with the leadscrew; the outer wall of the holder is sleeved with the nut; the left gear ring and the right gear ring are arranged on the inner wall of the nut, and the outer walls of the n rollers are sleeved with the left and right gear rings; the left gear ring is correspondingly arranged at the left ends of the rollers in the axial direction, the right gear ring is correspondingly arranged at the right ends of the rollers in the axial direction, and the left gear ring and the right gear ring are fixedly connected with the nut through the two locking bolts respectively; and n is a positive integer. Theplanetary roller lead-screw pair has the characteristics that the structure is simple, the precision is high, the bearing capacity is high, and the movement is stable. The problem that a split type holder cannot limit tilting of the rollers at a high precision is solved, and moreover, the bearing capacity of the lead-screw pair is improved.

Description

technical field [0001] The invention belongs to the design field of a planetary roller screw pair, and relates to a planetary roller screw pair. Background technique [0002] The commonly used types of planetary roller screw pairs are RV, RVI, differential, etc. There are many types, but the cage generally adopts a split floating structure at both ends. The cages are independent of each other (there is no circumferential constraint on each other), and there is inevitable mutual torsional displacement. Under the load-bearing thread force, the rollers are offset relative to the screw axis, which makes the bearing performance of the roller screw pair worse and reduces Transmission accuracy and smoothness. Contents of the invention [0003] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, to propose a planetary roller screw pair, which has the characteristics of simple structure, high precision, strong bearing capacity, ...

AI Technical Summary

Problems solved by technology

[0003] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, to propose a planetary roller screw pair, which has the characteristics of simple structure, high precision, strong bearing capacity, and stable movement, and solves the problem that the split cage cannot achieve high precision. Limit the problem of roller tilting, while improving the bearing capacity of the screw pair

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