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Planetary roller screw with clearance eliminating nut

A technology of anti-backlash nuts and planetary rollers, which is applied to belts/chains/gears, mechanical equipment, transmission devices, etc., to achieve the effects of wear compensation, convenient manufacture, and simple structure

Inactive Publication Date: 2015-09-16
姚琴
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the invention is to solve the problem of eliminating the axial gap between the nut and the roller, and between the roller and the screw in the planetary roller screw pair. The invention designs a planetary roller screw pair with an anti-backlash nut mechanism

Method used

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  • Planetary roller screw with clearance eliminating nut
  • Planetary roller screw with clearance eliminating nut
  • Planetary roller screw with clearance eliminating nut

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specific Embodiment approach

[0024] refer to figure 1 , figure 2 , a specific embodiment of the present invention is: in a planetary roller screw pair composed of a screw 1 and a nut assembly, several columnar helical rollers 2 are evenly distributed in the screw 1 and the nut assembly . Wherein the nut assembly is composed of a half nut 6, an elastic element 7, an anti-backlash nut 8, an elastic element 9, and a half nut 10 through bolt connectors 11, 12, 13. The nut assembly composed of the half nut 6, the anti-backlash nut 8 and the half nut 9 has a continuous helix, and has multi-thread threads, the tooth shape is triangular, and the tooth shape angle is 90°. The external thread of the screw has the same number of starts and profile as the internal thread of the nut assembly. Roller 2 is a single-line thread, and the tooth profile is a double-arc shape. The roller, lead screw, and nut assemblies have the same pitch. In order to eliminate the tilting moment of the roller caused by the helix angle...

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PUM

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Abstract

The invention discloses a planetary roller screw with a clearance eliminating nut. The planetary roller screw with the clearance eliminating nut is used for eliminating the axial clearance between a roller and a nut and the axial clearance between a roller and a screw at the same time. According to the technical scheme, on the basis that elastic elements (7 and 9) are added to half nuts (6 and 10) respectively for pretightening, the clearance eliminating nut (8) is used in cooperation, pretightening force is generated through the combined action of elastic deformation of the elastic elements (7 and 9) and elastic deformation of an elastic thin-wall radial plate A in the clearance eliminating nut (8), and therefore the effect of eliminating the axial clearance between the roller and the nut and the axial clearance between the roller and the screw is achieved. The planetary roller screw with the clearance eliminating nut is simple in structure, convenient to manufacture and high in practicability.

Description

technical field [0001] The invention relates to a planetary roller screw pair which converts rotary motion into linear motion, in particular to a planetary roller screw pair with an anti-backlash nut. Background technique [0002] The planetary roller screw pair is a mechanical transmission device that can convert rotary motion into linear motion. The planetary roller screw pair and the traditional ball screw pair are composed of basic components such as screw, nut, rolling body, etc., but the planetary roller screw pair uses a roller with both threads and teeth instead of the ball screw. The balls in the screw pair have a larger contact radius and contact point, and its load capacity, position accuracy, rated load, and service life are all better than ball screw pairs. [0003] However, due to the axial gap in the manufacture and installation of the planetary roller screw pair and the thread engagement between the nut and the roller, and the roller and the screw, there is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H25/22
CPCF16H25/2252F16H25/2003F16H25/2247
Inventor 姚琴
Owner 姚琴
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