Rolling element screw device

Abstract

Provided is a rolling-element screw device which does not sacrifice a stroke distance of a nut member (2) although carrying a sufficient amount of lubricant, or hinder heat radiation of the nut member (2), and contributes to facilitation of a replacement operation of a lubricant tank (4). The rolling-element screw device includes: a large number of rolling elements (5); a screw shaft (1) having an outer periphery on which a rolling groove (10) for the large number of rolling elements (5) is helically formed; a nut member (2) which has a through-hole (20) through which the screw shaft (1) is passed and which is threadedly engaged with the screw shaft (1) through intermediation of the large number of rolling elements (5); a lubricant supply hole (29) formed through the nut member (2) from an outer peripheral surface of the nut member (2) to an inner peripheral surface of the nut member (2); a lubricant tank (4) mounted to the outer peripheral surface of the nut member (2) and comprising an accommodating chamber for lubricant; and a lubricant applying body (43) standing from the lubricant tank (4), and inserted into the lubricant supply hole (29) along with a mounting operation of the lubricant tank (4) with respect to the nut member (2), the lubricant applying body (43) having a leading end portion coming into contact with the rolling groove (10) of the screw shaft (1) so as to apply the lubricant.

Description

technical field [0001] The present invention relates to a rolling element screw device such as a ball screw or a roller screw, and more particularly to a rolling element screw device having a function of applying a lubricant to rolling grooves of a screw shaft. Background technique [0002] Rolling element screw devices such as ball screws and roller screws include: a screw shaft with rolling grooves for rolling elements such as balls and rollers spirally formed on the outer peripheral surface; The body is screwed to the nut member of the above-mentioned screw shaft. In addition, a loaded rolling groove opposite to the rolling groove of the screw shaft is formed on the inner peripheral surface of the nut member, and by connecting the rolling groove of the screw shaft and the loaded rolling groove of the nut member, On the other hand, the loaded raceways of the rolling elements are helically formed around the screw shaft. Next, when the screw shaft is relatively rotated wit...

AI Technical Summary

Problems solved by technology

[0011] On the other hand, in the lubricating structure disclosed in Japanese Patent Application Laid-Open No. 2003-232427, although the lubricant box can be installed and detached from the nut member, when replacing the lubricant box, the above-mentioned connecting pipe must be temporarily removed from the lubricant box. Or the smear body is removed, and the connecting pipe is reassembled after the lubricant box is replaced, resulting in time-consuming and labor-intensive replacement

In addition, since the substantially C-shaped lubricant box covers almost the entire outer peripheral surface of the nut member, there is a possibility that heat dissipation of the nut member may be hindered.

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