JP2014105810A - Linear guide device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a linear guide device including a guide rail of high straightness.SOLUTION: A linear guide device is provided with a plurality of mounting holes 20 for mounting a guide rail 1 to a mounted portion of a base and the like by inserting bolts 21, in a state of being axially arranged almost at equal intervals. These mounting holes 20 are through holes vertically penetrating through a top face 1b and a bottom face 1c of the guide rail 1 opposed to each other. The mounting holes 20 have the shape formed by communicating large-diameter cylindrical portions at both ends through a small-diameter cylindrical portion therebetween, and as the large-diameter cylindrical portions at both ends have the same shape and the same size, the mounting holes 20 have the symmetrical shape in the vertical direction. The large diameter cylindrical portion at an upper face 1b side is a counterbore 20a for accommodating a head of the bolt 21, and the large-diameter cylindrical portion at a bottom face 1c side is a dummy counterbore 20b.

Description

  The present invention relates to a linear guide device including a guide rail with high straightness.

  An example of a conventional linear guide device will be described with reference to FIGS. On a substantially square guide rail 101 extending in the axial direction (longitudinal direction of the guide rail 101), a slider 102 having a substantially U-shaped cross section is assembled so as to be movable in the axial direction (longitudinal direction of the guide rail 101). ing. On the ridge line where the upper surface 101b of the guide rail 101 intersects with the left and right side surfaces 101a, 101a, a rolling element is formed of a concave groove having a substantially arc-shaped cross section extending in the axial direction (longitudinal direction of the guide rail 101). Grooves 110, 110 are formed, and at the intermediate position in the vertical direction of the left and right side surfaces 101a, 101a of the guide rail 101, a substantially ½ arc shape (half-section) extending in the axial direction (longitudinal direction of the guide rail 101). The rolling element rolling grooves 110 and 110 are formed of circular grooves.

  The slider 102 includes a slider main body 102A and end caps 102B and 102B that are detachably attached to both ends of the slider main body 102A in the axial direction (longitudinal direction of the guide rail 101). At the corners of the inner side surfaces of the sleeve portions 106 and 106 and the central portion in the vertical direction, the rolling rail rolling grooves 110, 110, 110, 110 of the guide rail 101 have a substantially ½ arc shape (semi-circular shape) facing the rolling elements. A rolling element rolling groove (not shown) is formed.

  A rolling element rolling path (not shown) having a substantially circular cross section is formed by the rolling element rolling grooves 110, 110, 110, 110 of the guide rail 101 and the rolling element rolling grooves of both sleeve portions 106, 106. In addition, these rolling element rolling paths extend in the axial direction (longitudinal direction of the guide rail 101). In this rolling element rolling path, a large number of rolling elements (not shown) made of steel balls are slidably loaded, and the slider 102 follows the guide rail 101 through the rolling of these rolling elements. Thus, it moves in the axial direction (longitudinal direction of the guide rail 101).

  The guide rail 101 of such a linear guide device is usually manufactured as follows. First, a long columnar material having substantially the same cross-sectional shape as the finished guide rail 101 (cross-sectional shape when cut in a plane perpendicular to the axial direction (longitudinal direction of the guide rail 101)) is manufactured by drawing. To do. Then, the columnar material is heat-treated and then machined to complete the guide rail 101. Examples of the machining include formation of a groove to be a rolling element rolling groove 110 and formation of an attachment hole 120 for attaching the guide rail 101 to an attachment portion such as a base using a bolt 121.

  At this time, the guide rail 101 is bent due to stress release by machining, but the degree of bending may increase depending on the balance of the shape of the guide rail 101 after machining (the attachment hole 120 is formed). FIG. 9 shows the curved state of the guide rail 101). For example, the shape of the guide rail 101 is symmetrical in the left-right direction when the guide rail 101 is viewed from the axial direction (longitudinal direction of the guide rail 101), but the guide rail 101 is axially long (longitudinal of the guide rail 101). In the vertical direction when viewed from the (direction), the mounting hole 120 forms an asymmetric shape. That is, the mounting hole 120 is a through-hole penetrating the guide rail 101 in the vertical direction, but a counterbore hole 120a for receiving the head of the bolt 121 is formed at the end of the guide rail 101 on the upper surface 101b side. Therefore, the through hole has an asymmetric shape in the vertical direction as shown in FIG.

JP 2004-156701 A

  For example, high straightness is usually required for a guide rail of a linear guide device used for a precision positioning table. If the attached part to which the linear guide device is attached has a high rigidity, the guide rail is corrected to follow the attached part when the guide rail is attached to the attached part. There is a possibility that it will be corrected with high straightness.

However, there is a problem that much labor is required to correct such curvature. In addition, when the rigidity of the attached portion is low, there is a high possibility that the curvature is not sufficiently corrected when the guide rail is attached to the attached portion. Therefore, it has been important to suppress the bending of the guide rail as much as possible when manufacturing the guide rail.
Although it is possible to forcibly correct the curvature by applying stress to the guide rail at the end of the manufacturing process of the guide rail, this method has a problem of requiring a lot of labor. Further, when the guide rail is corrected by such a method, a local curve that is difficult to correct is generated in the guide rail. Therefore, the movement of the slider in the smooth axial direction (longitudinal direction of the guide rail) is hindered.
Therefore, an object of the present invention is to solve the problems of the conventional techniques as described above.

In order to solve the above-mentioned problems, each aspect of the present invention has the following configuration. That is, a guide rail for a linear guide device according to an aspect of the present invention includes a guide rail having a substantially rectangular cross section having a rolling element raceway surface extending in an axial direction (longitudinal direction of the guide rail), and a rolling element raceway of the guide rail. A slider having a rolling element raceway surface facing the surface and attached to the guide rail so as to be relatively movable in an axial direction (longitudinal direction of the guide rail), a rolling element raceway surface of the guide rail, and a rolling element raceway of the slider A guide rail for a linear guide device comprising a plurality of rolling elements arranged in a freely rolling manner in a rolling element rolling path formed between the surfaces, and a through-hole penetrating two surfaces facing each other The through hole has a symmetrical shape with the center position in the through direction of the through hole as the center of symmetry.
In such a guide rail for a linear guide device according to an aspect of the present invention, the through hole is a mounting hole for inserting the bolt into a mounting portion through a bolt, and one end of the mounting hole. A counterbore hole for receiving the head of the bolt may be formed on the other end, and a counterbore hole having the same shape as the counterbore hole may be formed on the other end.

Further, a linear guide device including a guide rail according to another aspect of the present invention includes a substantially square guide rail having a rolling element raceway surface extending in an axial direction (longitudinal direction of the guide rail), and the guide rail. A slider having a rolling element raceway surface facing the rolling element raceway surface and attached to the guide rail so as to be relatively movable in an axial direction (longitudinal direction of the guide rail); a rolling element raceway surface of the guide rail; A plurality of rolling elements that are arranged so as to be able to roll in a rolling element rolling path formed between the rolling element raceway surfaces, and through holes that pass through the two surfaces facing each other pass through the bolts. A plurality of mounting holes for mounting the guide rail to the mounted portion are formed side by side in the axial direction (longitudinal direction of the guide rail), and one end of the mounting hole is a counterbore that houses the head of the bolt Between the adjacent mounting holes, a discard hole penetrating the two surfaces is formed, and the counterbore hole in the mounting hole is formed at both ends of the discard hole. A throw-off countersink having the same shape as the counterbore is formed at an end opposite to the side where the counterbore is formed.
In such a guide rail for a linear guide device according to another aspect of the present invention, the end of the thrown hole is closed at both ends of the guide hole where the thrown counterbore is not formed. It may be a non-through hole.

  Since the guide rail for the linear guide device according to the present invention has less curvature and high straightness, the movement of the slider in the smooth axial direction (longitudinal direction of the guide rail) is not hindered.

It is a perspective view which shows the structure of the linear guide apparatus of 1st embodiment. It is the front view which looked at the linear guide apparatus of FIG. 1 from the axial direction (longitudinal direction of a guide rail). It is AA sectional drawing of FIG. It is sectional drawing of the guide rail for the linear guide apparatus of FIG. It is sectional drawing of the guide rail for the linear guide apparatus of 2nd embodiment. It is sectional drawing of the guide rail of the modification of 2nd embodiment. It is a perspective view which shows the structure of the conventional linear guide apparatus. It is sectional drawing of the guide rail for the linear guide apparatus of FIG. It is a conceptual diagram which shows the mode of the curve of the guide rail of FIG.

An embodiment of a linear guide device 30 according to the present invention will be described in detail with reference to the drawings.
[First embodiment]
FIG. 1 is a perspective view showing the structure of the linear guide device 30 of the first embodiment. 2 is a front view of the linear guide device 30 of FIG. 1 viewed from the axial direction (longitudinal direction of the guide rail 101) (however, the end cap is omitted), and FIG. It is AA sectional drawing of FIG. In the following drawings, the same or corresponding parts are denoted by the same reference numerals.

  On a substantially square guide rail 1 extending in the axial direction (longitudinal direction of the guide rail 101), a slider 2 having a substantially U-shaped cross section is assembled so as to be relatively movable in the axial direction (longitudinal direction of the guide rail 101). It has been. In addition, the said cross-sectional shape means the shape of a cross section at the time of cut | disconnecting in the plane orthogonal to an axial direction (longitudinal direction of the guide rail 101). On the ridge line where the upper surface 1b of the guide rail 1 intersects with the left and right side surfaces 1a, 1a, a rolling element is formed of a concave groove having a substantially arc-shaped cross section extending in the axial direction (longitudinal direction of the guide rail 101). Grooves (corresponding to the rolling element raceway surface, which is a constituent element of the present invention) 10 and 10 are formed, and the axial direction (guide rail) is provided at the intermediate position between the left and right side surfaces 1a and 1a of the guide rail 1 The rolling element rolling grooves 10, 10 are formed of concave grooves having a substantially circular arc shape (semi-circular shape) in cross section extending in the longitudinal direction of 101.

  The slider 2 includes a slider body 2A and end caps 2B and 2B that are detachably attached to both ends of the slider body 2A in the axial direction (longitudinal direction of the guide rail 101). The direction (longitudinal direction of the guide rail 101) is opposite in the axial direction (longitudinal direction of the guide rail 101) in the opening portion of the gap between the guide rail 1 and the slider 2 at both ends (end surfaces of the end caps 2B). Side seals 5 and 5 are attached to seal the opening. The side seals 5 and 5 prevent foreign substances from entering the gap from the outside and outflow of the lubricant from the gap to the outside.

Further, at the corners of the inner side surfaces of the left and right sleeve portions 6 and 6 of the slider body 2A and the central portion in the vertical direction, the cross section of the guide rail 1 facing the rolling element rolling grooves 10, 10, 10, 10 is approximately 1 /. Two arc-shaped (semi-circular) rolling element rolling grooves 11, 11, 11, 11 (corresponding to the rolling element raceway surface which is a constituent element of the present invention) are formed. And between the rolling element rolling grooves 10, 10, 10, 10 of the guide rail 1 and the rolling element rolling grooves 11, 11, 11, 11 of the slider 2, the rolling element rolling path 14, having a substantially circular cross section, 14, 14 and 14 are formed, and these rolling element rolling paths 14 extend in the axial direction (longitudinal direction of the guide rail 101). The number of rolling element rolling grooves 10 and 11 provided in the guide rail 1 and the slider 2 is not limited to two rows on one side, and may be one row on one side or three rows or more, for example.
Furthermore, the slider 2 is formed in the axial direction (longitudinal direction of the guide rail 101) parallel to the rolling element rolling path 14 at the upper and lower portions of the thick portions of the left and right sleeve portions 6 and 6 of the slider body 2A. Straight paths 13, 13, 13, 13 including through holes are provided.

  On the other hand, the end cap 2B is made of, for example, an injection molded product of a resin material, and has a substantially U-shaped cross section. As shown in FIG. 3, the end caps 2B and 2B are half-doughnuts that communicate the rolling element rolling path 14 and the straight path 13 parallel to the rolling element rolling path 14 on the left and right sides of the contact surface (back surface) with the slider body 2A. A curved path 15 is formed. The straight path 13 and the curved paths 15 and 15 at both ends constitute a rolling element return path 16 that feeds and circulates the rolling element 3 from the end point of the rolling element rolling path 14 to the starting point. The rolling element rolling path 14 forms a substantially annular rolling element circulation path. In this rolling element circulation path, a large number of rolling elements 3 made of, for example, steel balls are slidably loaded, and the slider 2 is pivoted along the guide rail 1 through the rolling of these rolling elements 3. It moves in the direction (longitudinal direction of the guide rail 101).

  When the slider 2 assembled to the guide rail 1 is moved in the axial direction (longitudinal direction of the guide rail 101) along the guide rail 1, the rolling element 3 loaded in the rolling element rolling path 14 becomes the rolling element. It moves in the same direction as the slider 2 with respect to the guide rail 1 while rolling in the rolling path 14. When the rolling element 3 reaches the end point of the rolling element rolling path 14, it is scooped up from the rolling element rolling path 14 by the tongue 17 provided in the end cap 2B and sent to the curved path 15. The rolling element 3 that has entered the curved path 15 makes a U-turn and is introduced into the straight path 13, and reaches the curved path 15 on the opposite side through the straight path 13. Here, the U-turn is performed again to return to the starting point of the rolling element rolling path 14, and such circulation in the rolling element circulation path is repeated infinitely.

  As shown in FIG. 4, which is a cross-sectional view of the guide rail 1 when cut along a vertical plane along the axial direction (longitudinal direction of the guide rail 101), a bolt 21 is inserted into the guide rail 1 for the linear guide device. Thus, a plurality of mounting holes 20 for mounting the guide rail 1 to a mounting portion (not shown) such as a base are arranged in the axial direction (longitudinal direction of the guide rail 101) at almost equal intervals. ing. These mounting holes 20 are through-holes that vertically penetrate the upper surface 1b and the bottom surface 1c of the guide rails 1 that face each other, and the shapes thereof are as follows.

  That is, the mounting hole 20 has a shape in which large-diameter cylindrical portions at both ends are connected by a small-diameter cylindrical portion in the middle, and the large-diameter cylindrical portions at both ends have the same shape and the same size. Therefore, the mounting hole 20 has a symmetrical shape in the vertical direction (a symmetrical shape with the center position in the penetrating direction as the center of symmetry). The large-diameter cylindrical portion on the upper surface 1b side is a counterbore 20a that accommodates the head of the bolt 21, and the large-diameter cylindrical portion on the bottom surface 1c side is a discarded counterbore 20b. The discarded counterbore 20b is provided to make the shape of the mounting hole 20 symmetrical, and has no other function.

  When processing for forming the mounting hole 20 is performed during the manufacture of the guide rail 1, the internal stress is released and the guide rail 1 is likely to be bent. However, the mounting hole 20 has a symmetrical shape in the vertical direction as shown in FIG. Then, when processing for forming the mounting hole 20 is performed at the time of manufacturing the guide rail 1, the internal stress is released and the guide rail 1 is likely to bend, but the mounting hole 20 is symmetrical in the vertical direction as shown in FIG. When the shape is adopted, the curve generated in the guide rail 1 is offset in the vertical direction, so that the degree of the curve generated in the guide rail 1 due to the formation of the attachment hole 20 is suppressed. Therefore, since the straightness of the guide rail 1 is high, the movement of the slider 2 in the smooth axial direction (longitudinal direction of the guide rail) is not hindered.

Since such a linear guide device has high performance, it is incorporated in a machine tool (for example, various grinding machines), an injection molding machine, a semiconductor manufacturing machine, a transport machine, an industrial robot, etc., and is a machine part that guides a linearly moving object. It is suitable as.
In addition, this embodiment shows an example of this invention and this invention is not limited to this embodiment. For example, in the present embodiment, an example in which the through-hole formed in the guide rail 1 is an attachment hole has been described, but the through-hole is not limited to the attachment hole, but a positioning hole, an oil supply hole, a supply hole, and the like. It may be a through hole provided for other purposes such as a fat hole. Further, the shape of the through hole is not limited to the cylindrical shape, and may be a tapered hole, a complicated cross-sectional shape hole or the like.

[Second Embodiment]
FIG. 5 is a cross-sectional view of the guide rail 1 illustrating the structure of the linear guide device of the second embodiment (cross-sectional view of the guide rail 1 when cut along a vertical plane along the axial direction (longitudinal direction of the guide rail 101)). It is. In addition, since the structure of the linear guide apparatus of 2nd embodiment, an effect | action, and an effect are substantially the same as 1st embodiment, only a different part is demonstrated and description of the same part is abbreviate | omitted.

As shown in FIG. 5, the guide rail 1 for the linear guide device has a mounting hole 20 for inserting a bolt 21 and attaching the guide rail 1 to a mounting portion (not shown) such as a base. A plurality of lines are arranged in the direction (longitudinal direction of the guide rail 101) at almost equal intervals. These mounting holes 20 are through-holes that vertically penetrate the upper surface 1b and the bottom surface 1c of the guide rails 1 that face each other, and the shapes thereof are as follows.
That is, the mounting hole 20 has a shape in which a large-diameter cylindrical portion is connected to the upper end (end portion on the upper surface 1b side) of the small-diameter cylindrical portion, and the mounting hole 20 is asymmetric in the vertical direction. . The large-diameter cylindrical portion on the upper surface 1 b side is a counterbore 20 a that accommodates the head of the bolt 21.

  On the other hand, a discard hole 22 that vertically penetrates the top surface 1b and the bottom surface 1c is formed at an intermediate position between adjacent mounting holes 20. The shape of the discard hole 22 is the same as that of the attachment hole 20, but is formed in the guide rail 1 so as to be opposite to the attachment hole 20 in the vertical direction. That is, the throwing hole 22 has a shape in which the large diameter cylindrical portion is connected to the lower end (end portion on the bottom surface 1c side) of the small diameter cylindrical portion, and the throwing hole 22 is asymmetric in the vertical direction. . The large-diameter cylindrical portion on the bottom 1c side is a discarded counterbore 22a having the same shape and the same size as the counterbore 20a.

  As described above, since the discard hole 22 is formed in the guide rail 1 together with the mounting hole 20, the shape of the hole formed in the guide rail 1 is symmetrical in the vertical direction as a whole. When the process of forming the mounting hole 20 is performed during the manufacture of the guide rail 1, the internal stress is released and the guide rail 1 is likely to be bent. However, when the discard hole 22 is formed together with the mounting hole 20 as shown in FIG. Since the curve generated in the guide rail 1 is offset in the vertical direction, the degree of the curve generated in the guide rail 1 due to the formation of the hole is suppressed. Therefore, the straightness of the guide rail 1 is high. Note that the counterbore 22a is provided to make the shape of the hole formed in the guide rail 1 symmetrical as a whole, and has no other function.

  Here, the discard hole 22 may be a non-through hole. That is, as shown in FIG. 6, it may be a non-through hole in which the end on the upper surface 1b side (the end on the side where the discard counterbore 22a is not formed) is closed. In this case, the discard hole 22 extends to the vicinity of the upper surface 1 b of the guide rail 1. With such a configuration, it is possible to prevent foreign matters such as dust and dust from accumulating in the disposal hole 22. As a result, when the slider 2 passes over the throwing hole 22, foreign matter such as dust adheres to the rolling element rolling groove 11 of the slider 2, and the slider 2 has a smooth axial direction (longitudinal direction of the guide rail). The movement to is not hindered.

DESCRIPTION OF SYMBOLS 1 Guide rail 1a Side surface 1b Upper surface 1c Bottom surface 2 Slider 2A Slider main body 2B End cap 3 Rolling body 10 Rolling body rolling groove 11 Rolling body rolling groove 13 Linear path 14 Rolling body rolling path 15 Curved path 16 Rolling body return path 20 Mounting hole 20a Counterbore 20b Discrete counterbore 21 Bolt 22 Discrete hole 22a Discrete counterbore 30 Linear guide device

Claims (4)

A guide rail having a substantially square cross-sectional shape having a rolling element raceway surface extending in the axial direction, a rolling element raceway surface facing the rolling element raceway surface of the guide rail, and attached to the guide rail so as to be relatively movable in the axial direction. A linear guide, and a plurality of rolling elements arranged in a rolling element rolling path formed between the rolling element raceway surface of the guide rail and the rolling element raceway surface of the slider. A device,
A through-hole penetrating two surfaces facing each other is formed, and the shape of the through-hole is provided with the guide rail having a symmetric shape with the center position in the through-direction of the through-hole being a symmetric center. A linear guide device.   The through hole is an attachment hole for inserting a bolt to attach the guide rail to the attached portion, a counterbore hole for accommodating the head of the bolt is formed at one end of the attachment hole, and the other end is The linear guide device according to claim 1, comprising the guide rail having a counterbore hole having the same shape as the counterbore hole. A guide rail having a substantially square cross-sectional shape having a rolling element raceway surface extending in the axial direction, a rolling element raceway surface facing the rolling element raceway surface of the guide rail, and attached to the guide rail so as to be relatively movable in the axial direction. A linear guide, and a plurality of rolling elements arranged in a rolling element rolling path formed between the rolling element raceway surface of the guide rail and the rolling element raceway surface of the slider. A guide rail for the device,
A plurality of through-holes penetrating the two surfaces facing each other are formed side by side in the axial direction as attachment holes for inserting the guide rails to the attachment parts by inserting bolts, and at one end of the attachment holes A counterbore for accommodating the head of the bolt is formed,
Between the adjacent mounting holes, a discarding hole penetrating the two surfaces is formed, and of both end portions of the discarding hole, the side where the counterbore hole in the mounting hole is formed A linear guide device comprising the guide rail having a counterbore hole having the same shape as the counterbore hole at an end on the opposite side.   The said throwing hole is provided with the said guide rail which is the non-through hole with which the edge part by which the said throwing-off counterbore is not formed among the both ends is closed. The linear guide device described.

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