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Linear motion device

A technology of linear motion and rolling elements, applied in the direction of linear motion bearings, transmissions, bearings, etc., can solve the problems of lack of mechanical strength of circulating components, difficulty in increasing the speed of driving ball screws, etc.

Inactive Publication Date: 2006-06-07
NSK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a possibility of high intensity noise when the balls are driven at high speed
In addition, there is a possibility of lack of mechanical strength of the circulation parts
Due to the above reasons, it is difficult to increase the speed at which the ball screw is driven

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0037] Referring to Examples, the present invention will be more specifically explained as follows. The ball screw is set as follows. In the above ball screw, the resin material of the side cover 7 is changed several times. Then, the ball screw 1 thus set was driven at a high speed, and the running distance of the nut 3 when the nut 3 was running until the tongue portion of the side cover 7 was damaged was measured.

[0038] The specifications and driving conditions of the ball screw described are as follows:

[0039] Diameter of screw shaft: 50mm

[0040] Pitch: 12mm

[0041] Ball diameter: 7.9375mm

[0042] Maximum feed speed: 0.8m / s (rotation speed: 4000rpm)

[0043] Stroke: 500mm

[0044] Nut outer diameter temperature: 80°C

[0045] The types of resin materials are polyoxymethylene (POM), 46 nylon, 66 nylon, polyphenylene sulfide (PPS), and polyether etherketone (PEEK).

[0046] The flexural elastic modulus, Izod impact value and test results of these resin materi...

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PUM

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Abstract

The present invention relates to a ball screw. The ball screw comprises: a screw shaft 2 with a spiral groove 2a formed on its outer peripheral surface; a nut with a spiral groove opposite to the screw shaft formed on its inner peripheral surface. 3a; and a plurality of balls arranged in the rolling channel 6 of the rolling element, the rolling channel 6 of the rolling element is formed between the two said helical grooves 2a, 3a, under this condition, the plurality of balls 4 can Move freely. The nut 3 is fixed on the side cover 7 to scoop up the rolling ball 4 at one end of the rolling channel of the rolling element, so that the rolling ball 4 can be sent to the other end.

Description

[0001] This application claims foreign priority under 35 USC 119 based on Japanese Patent Application No. 2004-346277 filed on November 30, 2004, the contents of which are hereby incorporated by reference in their entirety. technical field [0002] The invention relates to a linear motion device such as a ball screw or a linear guide. Background technique [0003] A linear motion device, such as a ball screw or a linear guide, which moves linearly when a rolling element rotates, includes a part for circulation (rolling element circulation channel) in which the rolling element circulates. Circulation components have traditionally been made using metal tubes or machined metal pieces. However, according to this conventional structure, problems are encountered from the viewpoints of noise and mechanical strength. For example, in the case of a ball screw provided with a metal tube as a circulation part (tube circulation type ball screw), when the balls are scooped up from the ro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H25/22
CPCF16C29/0609F16H25/2214Y10T74/19772
Inventor 大久保努
Owner NSK LTD