JP4655995B2 - Linear motion guide device - Google Patents

Description

  The present invention relates to a linear motion guide device used as a linear guide in an industrial machine or the like, and in particular, a rolling element holding for holding a rolling element interposed between a rail-side rolling element rolling groove and a slider-side rolling element rolling groove. The present invention relates to a linear motion guide device using a rectangular rolling element holder as a cage.

Conventionally, as a linear motion guide device using a rectangular rolling element cage, a resin circulation path component is formed separately from the slider body, thereby facilitating molding and circulation path components. There is one that can be incorporated into the slider body while ensuring the continuity of the connecting portion as much as possible (see, for example, Patent Document 1).
Japanese Patent No. 3571911 (page 44, Fig. 40-41)

However, in the one disclosed in Patent Document 1, the rolling element holder that holds the rolling element interposed between the rail-side rolling element rolling groove and the slider-side rolling element rolling groove is molded integrally with the return guide. Therefore, the joint portion between the return guide and the rolling element holder interferes with the edge portion of the slider body. For this reason, there is a problem that the rolling element retainer and the return guide are deformed to prevent smooth rolling motion of the rolling element, and noise characteristics and operability are deteriorated. In addition, if a chamfered portion is provided on the end surface portion of the slider main body in order to avoid the above problem, there is a problem that the processing cost of the slider main body increases because the number of processing steps increases.
SUMMARY OF THE INVENTION An object of the present invention is to provide a linear motion guide device that can prevent a decrease in noise characteristics and operability without providing a chamfered portion or the like on an end surface portion of a slider body.

In order to achieve the above object, a linear motion guide device according to the present invention includes a linearly formed guide rail, a slider that moves relative to the longitudinal direction of the guide rail, and a roller that can freely roll into the slider. ; and a plurality of rolling elements incorporated, the slider, a plurality of slider-side rolling element rolling grooves plurality of rail-side rolling element rolling grooves and the respective opposite formed on the guide rail and the slider-side rolling formed between the rolling and the slider body having a element rolling groove and a through passage for returning a plurality of rolling elements formed in parallel, and the rail-side rolling element rolling grooves and the slider side rolling element rolling groove Between a pair of end caps having a plurality of curved paths communicating with both the moving body load rolling path and the rolling body return through path, and between the rail-side rolling element rolling groove and the slider-side rolling element rolling groove Two rolling elements that hold the rolling elements And a plurality of rolling elements formed between the plate parts, the two rolling element holders being made of synthetic resin and disposed between the slider body and the end cap. In the linear motion guide device having the holding portion, the notch portion that forms the relief portion with respect to the edge portion of the slider main body is provided not at the plate portion but only at both end portions of the rolling element holding portion. And

  In the linear motion guide device according to the present invention, when the rolling element retainer is assembled to the slider body, the edge portion between the end surface portion of the slider body that comes into contact with the plate portion and the inner side surface portion of the slider body that comes into contact with the rolling body holding portion. Therefore, the rolling element cage does not interfere with each other, and deformation due to interference with the edge portion does not occur in the rolling element cage, so that noise characteristics and operability are reduced without providing a chamfered portion or the like on the end surface portion of the slider body. Can be prevented.

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
As shown in FIGS. 1 and 2, the linear motion guide device according to the first embodiment of the present invention includes a guide rail 11 formed in a linear shape and a slider 12 that relatively moves in the longitudinal direction of the guide rail 11. And a large number of rolling elements 13 (see FIGS. 2 and 3) incorporated in the slider 12.

  The guide rail 11 has left and right side surface portions 111 and 111 (see FIG. 4), and rail-side rolling element rolling grooves 14 a extend along the longitudinal direction of the guide rail 11 in the left and right side surface portions 111 and 111, respectively. Is formed. Further, the guide rail 11 has an upper surface portion 112 (see FIG. 4), and rail-side rolling element rolling grooves 14b are provided at the intersections of the upper surface portion 112 and the left and right side surface portions 111, 111, respectively. 11 is formed along the longitudinal direction.

  The slider 12 is provided with a slider main body 15 whose cross section along the width direction of the guide rail 11 has a substantially bowl shape. The slider main body 15 includes four sliders facing the rail-side rolling element rolling grooves 14a and 14b, respectively. A side rolling element rolling groove 18 (see FIG. 5) is provided, and four rolling element returning through passages 21 parallel to the slider side rolling element rolling groove 18 are provided.

  The slider 12 includes a pair of end caps 16 attached to one end and the other end of the slider main body 15 so as to close the rolling element return through passage 21. Four curved paths 20 (communication with both the rolling element load rolling path 19 and the rolling element return through path 21 formed between the rolling element rolling grooves 14a and 14b and the slider-side rolling element rolling groove 18 ( 2) is formed.

  Further, the slider 12 includes two rolling element holders 22 (see FIG. 3) that hold the rolling elements 13 interposed between the rail-side rolling element rolling grooves 14a and 14b and the slider-side rolling element rolling grooves 18. These rolling element holders 22 are made of a synthetic resin material. The rolling element holder 22 has two plate portions 221 (see FIG. 6) interposed between the slider main body 15 and the end cap 16, and three rolling portions are interposed between the plate portions 221. The moving body holding portion 222 (see FIGS. 6 and 7) is formed so as to contact the inner side surface portion of the slider body 15 in which the slider-side rolling body rolling groove 18 is formed.

The rolling element holding portions 222 are integrally molded with the plate portion 221, and notches 24 (see FIG. 5) that form relief portions with respect to the edge portions of the slider body 15 at both ends of each rolling element holding portion 222. 8).
When such a notch 24 is provided at both ends of the rolling element holder 222, the slider body 15 with which the plate portion 221 abuts when the rolling element holder 22 is assembled to the slider body 15 as shown in FIG. The rolling element holder 22 does not interfere with the edge portion 25 of the slider body 15 with which the end face portion 151 and the rolling element holding portion 222 come into contact. As a result, deformation due to interference with the edge portion 25 does not occur in the rolling element holder 22, so that it is possible to prevent deterioration of noise characteristics and operability without providing a chamfered portion or the like on the end surface portion of the slider body 15. it can.

Further, as shown in FIG. 10, the notches 24 are formed on both ends of the rolling element holding portion 222 by providing the notches 24 that form relief portions with respect to the edge portion of the slider body 15. Compared with the case where it is provided on the plate portion 221 of the container 22, the rolling element holder 22 can be easily released from the molding die, so that the quality and productivity of the rolling element holder 22 are not adversely affected. .
The shape of the notch 24 is not limited to that shown in FIG. 8. For example, the radius of curvature R of the corner between the plate 221 and the rolling element holding part 222 is about R = 0.1 mm. The size of the entire part may be from 0.5 mm × 0.5 mm to, for example, about 0.3 mm × 0.3 mm.

1 is a perspective view of a linear guide apparatus according to a first embodiment of the present invention. It is a top view of the linear motion guide apparatus shown in FIG. It is sectional drawing which follows the III-III line of FIG. It is sectional drawing of the guide rail shown in FIG. It is sectional drawing of the slider main body shown in FIG. It is a front view of the rolling element holder | retainer shown in FIG. It is sectional drawing which follows the VII-VII line of FIG. It is sectional drawing which follows the VIII-VIII line of FIG. It is a figure for demonstrating the effect of the linear motion guide apparatus which concerns on the 1st Embodiment of this invention. It is a figure which shows the modification of the escape part shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Guide rail 12 Slider 13 Ball | bowl 14a, 14b Rail side rolling element rolling groove 15 Slider main body 16 End cap 17 Slider side rolling element rolling groove 19 Rolling body load rolling path 20 Curved path 21 Rolling body return through path 22 Rolling Moving object holder 221 Plate part 222 Rolling element holding part 24 Notch

Claims (1)

A linearly formed guide rail, a slider that relatively moves in the longitudinal direction of the guide rail, and a number of rolling elements that are rotatably incorporated in the slider,
Plural said slider, which is parallel with the plurality of slider side rolling element rolling grooves and the slider-side rolling element rolling grooves plurality of rail-side rolling element rolling grooves and the respective opposite formed on the guide rail A rolling element returning through passage , a rolling element load rolling path formed between the rail side rolling element rolling groove and the slider side rolling element rolling groove, and the rolling element return penetration. A pair of end caps having a plurality of curved paths communicating with both of the paths, and two rolling elements that hold the rolling elements interposed between the rail-side rolling element rolling grooves and the slider-side rolling element rolling grooves Including a cage,
A linear motion in which the rolling element holder is made of a synthetic resin and has two plate portions disposed between the slider body and the end cap, and a plurality of rolling element holding portions formed between the plate portions. In the guidance device,
2. A linear motion guide device according to claim 1 , wherein notch portions that form relief portions with respect to the edge portion of the slider body are provided not at the plate portion but only at both ends of the rolling element holding portion.

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