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Roller screw

A technology of roller screw and roller, applied in belt/chain/gear, mechanical equipment, transmission, etc., can solve the problems of complex structure and limited rolling direction of rollers, and achieve the effect of simple assembly and structure

Active Publication Date: 2008-11-12
THK CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be considered that this is due to the fact that the rollers are caught in the lifting part when they rise in the loaded ball rolling groove of the nut, or that the structure of the circulation path for the rollers to perform complicated movements will become complicated.
[0008] Also, balls are able to roll in any direction, while rollers are limited in which direction they can roll

Method used

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  • Roller screw
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0054] figure 1 A roller screw according to one embodiment of the present invention is shown. The roller screw has: a threaded shaft 1 having a helical roller rolling groove 1a formed on the outer peripheral surface; and a helical load roller rolling groove 2a formed on the inner peripheral surface corresponding to the roller rolling groove 1a, A nut assembly 2 capable of relative rotation on the threaded shaft 1 is assembled. On the nut assembly 2, install the return as a circulation part connecting one end and the other end of the loaded roller rolling path 3 between the roller rolling groove 1a of the threaded shaft 1 and the loaded roller rolling groove 2a of the nut assembly 2. Tube 4. Inside the return pipe 4, a roller return path 5 having a quadrangular cross-section, which is a square in this embodiment, is formed in the axial direction. In the loaded roller rolling path 3 between the roller rolling groove 1a of the screw shaft 1 and the loaded roller rolling groove...

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PUM

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Abstract

A roller screw has a screw shaft (1) in the outer peripheral surface of which there is formed a helical roller rolling groove (1a), a nut member (2a) in the inner peripheral surface of which there is formed a helical load roller rolling groove (2a) facing the roller rolling groove (1a), a return pipe (4) inside of which there is formed a roller return path (5) connecting one end and the other end of a load roller rolling path (3) between the roller rolling groove (1a) of the screw shaft (1) and the load roller rolling groove (2a) of the nut member (2), and rollers (6) received in the load roller rolling path (3) and the roller return path (5). The roller return path (5) is twisted so that the rollers change the attitude as they move in the axial direction of the return pipe (4), and this facilitates assembling, makes the structure simple, and enables the rollers to circulate smoothly.

Description

technical field [0001] The present invention relates to roller screws with rollable rollers interposed between a threaded shaft and a nut assembly. Background technique [0002] As a ball screw with rolling balls interposed between the threaded shaft and the nut assembly, the friction coefficient when the threaded shaft rotates relative to the nut assembly can be reduced compared to a screw that makes sliding contact without intervening balls, Therefore, it has been applied to the positioning mechanism of machine tools, the feeding mechanism and the steering gear of automobiles. [0003] In the ball screw, a plurality of balls are interposed between the helical ball rolling groove formed on the outer peripheral surface of the threaded shaft and the helical loaded ball rolling groove formed on the inner peripheral surface of the nut assembly. When the threaded shaft rotates relative to the nut assembly, a plurality of balls roll on the ball rolling grooves of the threaded sh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H25/22
Inventor 寺町彰博道冈英一丹羽宏西村健太郎
Owner THK CO LTD