JP2002048138A - Buried cap screw for linear guide unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a buried cap screw for linear guide unit in which fitting of the buried cap screw into an installation hole is simple and dependable as compared with a conventional buried cap screw made of synthetic resin liable to be sunk in the installation hole due to the effect of chips and the like. SOLUTION: The buried cap screw 50 fitted into the installation hole formed on a raceway track rail is introduced easily into the installation hole by means of an introduction part 54 formed underside 52 with smaller diameter outer periphery than the bore diameter of the installation hole and the introduction part 54 helps stabilize the posture of the buried cap screw 50 in the installation hole. By press fitting the buried cap screw 50 into the installation hole with the posture being in such stabilized condition, a fitting part 55 on top face 51 side is press fitted positively into the installation hole. Since a pressing force can be relieved by a plurality of relief grooves 56 formed on the fitting part 55 with depth larger than a press fitting allowance, such deformation as to expand the raceway track rail is prevented from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting member having an opening formed above a track rail used for a linear motion guide unit and having a mounting bolt inserted for mounting to one of relative moving members such as a base. The present invention relates to an embedding plug applied to a mounting hole to close the hole.

[0002]

2. Description of the Related Art Conventionally, in order to guide relative linear motion, a linear motion guide unit as shown in FIGS.
Basically, a track rail 1 attached to a base 8 as one relative moving member and a table (not shown) serving as the other relative moving member and straddled by the track rail 1 on the track rail 1 Slider 2 that can slide
And a linear motion rolling guide unit U composed of FIG. 7 is a perspective view showing a conventional linear motion rolling guide unit partially cut away, and FIG. 8 is a cross-sectional view of the track rail of the linear motion rolling guide unit shown in FIG. FIG. First track grooves 4, 4 are formed on a pair of longitudinal side surfaces 3, 3 facing the outside of the track rail 1, respectively. In order to attach the track rail 1 to the base 8, the track rail 1 has a mounting hole 6 through which a mounting bolt 26 is inserted.
Is formed so as to be open to the upper surface 5 of the substrate.

The slider 2 includes a casing 10 that straddles the upper surface 5 of the track rail 1, an end cap 11 that is mounted in contact with both longitudinal end faces of the casing 10, and a gap between the track rail 1 and the end cap 11. An end seal 12 is provided on the end face of the end cap 11 for sealing. The end cap 11 and the end seal 12 are mounted on the casing 10 by mounting screws 13. A second raceway groove 14 is formed in the casing 10 at a position facing the first raceway groove 4 of the raceway rail 1. The casing 10 is further provided with a screw hole 16 opened on the top surface 15 for attaching the slider 2 to the table. A lower surface seal 17 is attached to the lower surfaces of the end cap 11 and the casing 10 to seal a gap between the casing 10 and the end cap 11 and both longitudinal side surfaces 3 of the track rail 1.

In order to make the slider 2 slidable with respect to the track rail 1, a plurality of balls 20 as rolling elements are formed in the first track groove 4 formed in the track rail 1 and the casing 10. It is possible to roll on the load track path 21 formed between the second track groove 14. The slider 2 includes a holding band 24 that holds the ball 20 so that the ball 20 does not dissipate even when the slider 2 is separated from the track rail 1. Each ball 20 that has rolled on the load track path 21 has a return path 22 formed in the casing 10 and a direction change path (not shown) formed in both end caps 11 and connected to the load track path 21 and the return path 22. Infinite circulation is possible by traveling with. Return passage 22
And the direction change path constitute a no-load track path, and the load track path 2
1 and the no-load orbital path constitute an infinite circulation path. A grease nipple 25 for supplying grease to the endless circulation path is attached to the end cap 11 so as to protrude from the outer surface of the end seal 12.

[0005] The track rail 1 is usually mounted on the base 8 by mounting bolts 26 at a plurality of positions preferably spaced at equal intervals in the longitudinal direction. The mounting bolt 26 is inserted into the mounting hole 6 formed in the track rail 1 and screwed into the screw hole of the base 8. In a state where the mounting bolt 26 is screwed in, the head 27 of the mounting bolt 26 is in a state of sinking below the opening of the counterbore hole 37 above the mounting hole 6. When the linear motion rolling guide unit U is used in an environment where dust, cutting chips, etc., fly, foreign matter easily accumulates in the recess when the upper portion of the mounting hole 6 is kept open, and foreign matter is contained in the slider 2. The track rails 1 are prevented from accumulating and foreign matter is prevented from entering into the slider 2, and the track rails 1 are not hindered from sliding on the track rails 1. After attaching to the base 8, an embedding plug 38 that covers the head 27 of the attachment bolt 6 is fitted into the counterbore hole 37.

Generally, the plug 38 is a resin molded product and is set so as to be flush with the upper surface 5 of the track rail 1. Usually, a resin molded product as described above may be used. However, in a machine tool or the like, chips and the like that have become hot due to the cutting work are scattered on the track rail 1. In this case,
Instead of a resin molded product that is likely to be deformed by heat, a metal plug such as aluminum or brass that does not deform with some heat is used.

FIG. 9 shows a state in which a metal plug 40 is mounted above the mounting hole 6 formed in the track rail 1 of the linear motion rolling guide unit U shown in FIG. FIG. 2 is a cross-sectional view cut along a longitudinal direction of the track rail 1 in FIG. The mounting hole 6 formed in the track rail 1 is connected to the first counterbore hole 30 having a diameter D ₁ into which the head 27 of the mounting bolt 26 is loosely fitted, and is connected to the first counterbore hole 30 and has a diameter of the first counterbore hole 30. D ₁ smaller diameter screw insertion holes 32, and connected to the first counterbore hole 30 while opening the upper surface 5 of the track rail 1 and the first has a D ₂
Slightly than the diameter D ₁ of the counterbore hole 30 is made from the second counterbore hole 33 having a larger diameter D _3. First counterbore hole 3
0 has a depth slightly exceeding the height of the head 27 of the mounting bolt 26 and accommodates the head 27. The screw portion 29 of the mounting bolt 26 is loosely fitted into the screw insertion hole 32. A step 34 is formed between the first counterbore hole 30 and the screw insertion hole 32. A screw hole 35 is formed in the base 8 so as to correspond to the mounting hole 6 of the track rail 1. The screw portion 29 of the mounting bolt 26 passed through the mounting hole 6 is screwed into the screw hole 35, whereby the mounting bolt is formed. The lower surface 28 of the head 27 of the 26 is the seating surface 31 of the step portion 34.
The track rail 1 can be fixed to the base 8 in a state of being pressed against the base rail 8.

When the mounting of the track rail 1 to the base 8 by the mounting bolt 26 is completed, the second counterbore hole 3 is formed.
A metal plug 40 made of aluminum, brass, or the like is press-fitted into 3. The height of the plug 40 is the second counterbore hole 33.
Is slightly higher than the depth of the plug 40
Is pushed until it comes into contact with the step portion 34 of the second counterbore hole 33, a projecting portion 41 protruding from the upper surface 5 of the track rail 1 by δ occurs. The projecting portion 41 of δ of the plug 40 may damage the end seal 12 and collide with the slider 2 as it is, so that it is cut so as to be flush with the upper surface 5 of the track rail 1. The cut upper surface of the plug 40 is precisely flush with the upper surface 5 of the track rail 1 so that foreign matter such as chips does not enter the slider 2 for a long period of time even when used in a place with a lot of chips. I have to. That is, even if the slider 2 slides on the track rail 1 for a long period of time, the end seal 12 on the end face of the slider 2 is prevented from being worn at the plug 40. Conventionally, shaving of the protruding portion 41 of the plug 40 has been performed by a user who uses the linear motion rolling guide unit U by hand shaving or an arbitrary cutting tool.

A plug 40 made of a metal such as aluminum or brass is mounted as shown in FIG. 9 and then machined flush with the upper surface 5 of the track rail 1 by a plug cutter (not shown). ing. Therefore, when using the metal plug 40,
After the first counterbore hole 30 is processed, the second counterbore hole 33 needs to be additionally processed on the track rail 1, and a protruding portion 41 of the track rail 1 on the upper surface 5 is processed by an embedding cutter. Need to be one. If the fitting between the plug 40 and the second counterbore hole 33 is too tight, the dimension E between the track grooves on both sides of the track rail 1 (see FIG. 8) expands, and the influence on the track groove becomes large. It is necessary to strictly control the fitting accuracy between the stopper 40 and the second counterbore hole 33. Further, the conventional metal plug 40 has a circular plate shape and a screw shape in which the outer peripheral surface is flush or the peak is broken.

As a plug for closing the rail mounting hole of the linear guide device, a cap designed to be easily mounted to and detached from the rail mounting hole and to be mounted flat without forming irregularities on the rail surface is used. No. 117914 (full text). The cap for the rail mounting hole of the linear guide device disclosed in this publication includes a cap body formed by pressing a steel plate and a rubber or synthetic resin formed by being fixed to the upper surface and the upper outer peripheral surface of the cap body. And an elastic covering member made of A plurality of projections separated by slits are formed on the outer periphery of the cap body, and the projections are strongly pressed against the inner peripheral surface of the rail mounting hole by their elastic force and exhibit a retaining force. The slit provides elasticity to the projection and functions as an outlet for high air pressure generated inside and an air inlet for desorption. The elastic covering member elastically deforms in response to the press-fit of the cap body, fills a gap between the rail mounting hole, and prevents a step or a pressing place from being formed between the upper surface of the guide rail and the upper surface of the elastic covering member. . When the outer edge of the elastic covering member is pushed up and raised, the raised portion is cut off and flattened.

[0011]

In the above-described plug, when used in an environment where there are many foreign substances such as cutting chips such as a machine tool, the plug is pushed into the counterbore hole by the foreign substance, and the plug becomes flush with the upper surface of the track rail. There is a step between the stopper and the plug, and foreign matter tends to accumulate further in the step. Foreign matter accumulated in the step portion damages the end seal and, when it enters the rolling element portion in the slider, particularly between the raceway grooves, indents are formed on the raceway surface and the rolling surface, which causes a short life. The solution is to make it easier to insert the plug into the mounting hole, and to make it easier to deform part of the plug when the plug is pressed into the mounting hole to ensure the mounting in the mounting hole. There are issues to be addressed.

[0012]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, and the mounting hole is made smaller than the conventional synthetic resin plug which is easily depressed into the mounting hole due to the influence of chips or the like. An object of the present invention is to provide a plug for a linear motion guide unit in which mounting of the plug inside the plug is simple and reliable, and even when the load applied to the plug becomes large, it is difficult to start sinking into the mounting hole.

According to the present invention, there is provided an embedding plug applied to a mounting hole for closing a mounting hole opened on an upper surface of a track rail which constitutes a linear motion guide unit together with a slider.
The plug is disposed on the upper surface side and press-fitted into the mounting hole. The plug is disposed on the lower surface side following the fitting portion, and the plug is inserted into the mounting hole. And a lead-in portion which is introduced into the mounting hole before the press-fitting and which stabilizes the posture of the plug in the mounting hole. The fitting portion has a depth greater than a fitting press-fitting allowance. The present invention also relates to a plug for a linear motion guide unit, wherein a relief groove formed at the bottom is formed, and the introduction portion is formed on an outer peripheral surface having a circular diameter smaller than the diameter of the mounting hole.

According to the plug for the linear motion guide unit, when the plug is applied to the inside of the mounting hole, the introduction portion is formed on the outer peripheral surface having a smaller diameter than the hole diameter of the mounting hole. Is easy to introduce the plug into the mounting hole, and stabilizes the posture of the plug in the mounting hole before press-fitting the fitting portion. By fitting the plug into the mounting hole and press-fitting the plug in the posture stable state, the fitting portion is securely pressed into the mounting hole. The fitting part has multiple relief grooves formed at a depth greater than the fitting press-fitting allowance, so the force for press-fitting can escape into the relief groove and expand the track rail. No such deformation is caused.

In this plug for a linear motion guide unit, the plug is formed in a circular plate. The plug is made of metal such as aluminum or brass. By forming the plug with a circular plate material, the formation of the mounting hole in the track rail and the manufacture of the plug are simplified, and the handling of the plug is also easy. Even when the linear guide unit is used in an environment where foreign materials such as chips fly, the metal plug can withstand being pushed or deformed by the foreign materials.
It is possible to keep the upper surface of the track rail flush for a long time and to ensure the seal inside the slider of the linear motion guide unit.

In this plug for a linear motion guide unit, the relief groove formed in the fitting portion of the plug is a plurality of concave grooves formed in a rectangular cross section. When the plug is pressed into the mounting hole of the track rail, the force acting on the fitting part escapes to a plurality of grooves formed in a rectangular cross section. And the track rail does not bulge and deform so as to affect the movement of the slider. Further, the outer peripheral surface of the introduction portion of the plug is formed to have substantially the same diameter as the bottom diameter of the clearance groove. By forming the diameter of the outer peripheral surface of the introduction part of the plug approximately equal to the bottom diameter of the relief groove, the processing diameter of the bottom part of the relief groove can be easily set by measuring the outer diameter of the introduction part. And can be measured.

[0017] The outer peripheral surface of the introduction portion of the plug has at least a height of 1/5 of the thickness of the plug. By setting the height of the outer peripheral surface of the introduction portion in this way, the introduction portion further stabilizes the posture of the plug before press-fitting into the attachment hole as a peek into the attachment hole of the plug.

[0018] The fitting portion of the plug has a tapered portion on the outer peripheral surface on the upper surface side corresponding to a chamfered portion formed on an opening peripheral edge of the mounting hole opened to the track rail. . The plug is fitted so that the tapered portion matches the chamfer formed in the opening of the mounting hole, and the posture before and during press-fitting the plug into the mounting hole is further stabilized.

The linear motion guide unit is configured such that the track rail is mounted on one of the relative moving members by a mounting bolt passing through the mounting hole, and the slider is slidably provided on the track rail. Is attached to the other of the relative moving members, thereby being applied between the relative moving members. The mounting hole has a second counterbore hole connected to the first counterbore hole and having a diameter larger than that of the first counterbore hole above the first counterbore hole into which the head of the mounting bolt fits. The plug is press-fitted into the second counterbore hole to cover the mounting hole.

Further, the linear motion guide unit is a linear motion rolling guide unit having a raceway groove formed on a longitudinal side surface of the raceway rail, and the slider has a raceway groove opposed to the raceway groove of the raceway rail. Formed casing,
End caps fixed to both ends of the casing, a plurality of rolling elements capable of traveling on an infinite circulation path including a load track path formed between the two track grooves and a direction change path formed on the end cap, and An end seal is provided on an end face of the end cap to seal between the track rail and the slider.

[0021]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a plug for a linear motion guide unit according to the present invention. FIG. 1 is a front view showing an embodiment of the plug for a linear motion guide unit according to the present invention, and FIG. 2 is a bottom view of the plug for a linear motion guide unit shown in FIG. As a linear motion guide unit,
For example, the unit already described with reference to FIG. 7 can be used, but the description of the linear guide unit will not be repeated here.

The plug 50 shown in FIGS. 1, 2 and 5 is mainly a plug made of metal such as aluminum or brass. Plug 5
0 is an upper surface 5 parallel to each other as shown in FIGS.
1 and a lower surface 52, and is formed of a circular plate material whose outer diameter is sufficiently larger than the thickness between the upper surface 51 and the lower surface 52.
The cylindrical outer periphery 53 of the plug 50 includes an introduction portion 54 formed on the lower surface 52 side, and a fitting portion 55 formed on the upper surface 51 side following the introduction portion 54. In the fitting portion 54 of the cylindrical outer periphery 53, a plurality of (three in this example) rectangular grooves 56 having a rectangular cross section are formed at regular intervals (every 0.5 mm) in the axial direction of the plug 50 as escape grooves. They are formed side by side. Groove 56
When the plug 50 is pressed into the second counterbore hole 33,
The fitting portion 55 becomes deformable and functions to release the load.

The concave groove 56 of the fitting portion 55 is formed so as to escape more than the fitting press fitting allowance. That is, as shown in FIG. 6, the mounting hole 6 opened in the track rail 1 is usually formed by a first counterbore hole 30 having a diameter D1. Diameter D1 is 2
5.0 mm (25.00 mm-
The outer diameter D4 of the fitting portion 55 of the plug 50 to be fitted is 25.3 mm (dimension tolerance ± 0.02 mm) with respect to the first counterbore hole 30 of 25.2 mm). The shimeshiro (press-fitting allowance) is about 0.3 mm (D4-D1) in diameter and 0.15 mm in radius. The depth F of the concave groove 56 is larger than the above-mentioned squeeze (fitting press fitting allowance), and is set to 0.3 mm in radius.

Prior to press-fitting the plug 50 into the mounting hole 6, the introduction portion 54 of the plug 50 is introduced into the mounting hole 6 by looking through the mounting hole 6, and in order to stabilize the posture before fitting and press-fitting in the inserted state. It is provided in. Therefore, the introduction unit 54
Hole diameter of mounting hole 6 (diameter D1 of first counterbore hole 30 = 25.
0 mm), and the bottom diameter D5 (2
5.0-0.3 = 24.7 mm) or a cylindrical portion having a circular diameter D6 (24.7 ± 0.1 mm) slightly smaller than the bottom diameter D5. The introduction part 54 is provided with the fitting part 5.
5 escapes in the form of a rectangular paragraph from the outer periphery, and has a length (1.5 mm) of about 1/3 of the thickness T ₁ (5 mm) of the plug 50.
have.

Since the plug 50 is provided with the introduction portion 54, even if the plug 50 is made of a metal which is much more rigid than a plug made of a synthetic resin having low rigidity, the track rail 1 can be stably formed.
Can be introduced into the second counterbore hole 33 of the mounting hole 6. The height H ₁ of the outer peripheral surface of the introduction portion 54 is at least １ ／ of the thickness T ₁ (5 mm) of the plug 50, here 1/1
Since it has a rectangular paragraph shape formed as a cylindrical portion having a height of 3, it can be set in parallel without inclining on the upper surface 5 of the track rail 1 before being pressed into the counterbore hole 30. Further, since the fitting portion 55 is formed with a plurality of rectangular concave grooves 56 as escape grooves having a depth F larger than the fitting press-fitting allowance, even if the fitting press-fitting allowance is large, the concave groove 56 is formed. It is possible to release the shimeshiro load into the groove 56, and the influence that the dimension E (shown in FIG. 8) between the track grooves of the track rail 1 expands due to the press-fitting of the plug 50 into the second counterbore hole 33 is also caused. It is small. Therefore, even if the fitting accuracy is the same as that of the conventional synthetic resin plug 38, the metal plug 50 can be used, and the fitting into the second counterbore hole 33 is also made of synthetic resin. It is several steps stronger than.

The concave groove 56 formed as a clearance groove in the fitting portion 55 is a plurality of rectangular grooves having a depth F larger than the fitting press-fitting allowance. Hole 33
Even if the outer peripheral surface of the plug 50 is peeled when the plug 50 is press-fitted, the stripped burr can be stored in the concave groove 56, and the press-fitting operation of the plug 50 can be performed stably.

FIG. 5 is a sectional view showing a state in which the plug for a linear motion guide unit shown in FIG. 1 is attached to a track rail.
As shown in FIG. 5, even in a specification for fitting a conventional metal plug 38, that is, in a specification in which the second counterbore hole 33 is additionally machined with high accuracy, the plug 50 is connected as described above. Since it can be easily fitted, it can be set flush with the upper surface 5 of the track rail 1, eliminating the need for processing with an embedding cutter. In the above embodiment, the plug 50
Has been described as being made of metal, but it is clear that it can also be applied to synthetic resin.

FIG. 3 is a front view showing another embodiment of the plug for a linear motion guide unit according to the present invention, FIG. 4 is a bottom view of the plug for a linear motion guide unit shown in FIG. 3, and FIG. It is sectional drawing which shows the state which attached the plug shown to the track rail. Another plug 60 of the present invention, as shown in FIGS.
0, a circular plate having an upper surface 61 and a lower surface 62 parallel to the upper surface 61.
The mounting hole 6 of the track rail 1 is formed with a first counterbore hole 30 as shown in FIG.
And a chamfered portion 36 in which a corner of an upper surface which is an opening edge opening on the upper surface 5 of the track rail 1 is chamfered. Therefore, the plug 60
As shown in FIG. 6, the tapered portion 67 is fitted so as to match the chamfered portion 36 of the counterbore hole 30.

It should be noted that the plug 60 may be assured of being flush with the upper surface 5 of the track rail 1 by being processed with a plug cutter. The chamfered portion 37 can be closed without a gap, and the intrusion of dust can be prevented. In this case, the processing of the second counterbore hole 33 is of course unnecessary. Plug 6
0 is the plug 50 except for the structure other than the tapered portion 67.
Similar to (FIGS. 1, 2 and 5), a fitting portion 65 having an introduction portion 64 and a concave groove 66 as a relief groove on the cylindrical outer periphery 63.
It has become. The functions of these parts are the same as those of the corresponding parts of the plug 50 shown in FIG.
Although the description will not be repeated, the plug 60 is a plug 5
0, a counterbore hole 30 formed in the track rail 1
Can be easily fitted.

As shown in FIG. 3, the height H ₂ of the outer peripheral surface of the introduction portion 64 is １ ／ of the thickness T ₂ (5 mm) of the plug 60.
(1 mm). Since it is formed at least in such a length, it can be set stably and parallel without inclining on the upper surface 5 of the track rail 1 before fitting and press fitting. In this example, the diameter D1 of the counterbore hole 30 is 23.0.
mm (23.0 mm to 23.3 in consideration of dimensional tolerance)
mm), whereas the diameter D4 of the cylindrical outer periphery 63 of the fitting portion 63 is 23.4 mm (23.4 mm in consideration of dimensional tolerance).
4 mm to 23.5 mm), and the maximum shimeshiro is 0.5 mm in diameter. 22. The bottom diameter D5 of the concave groove 66 is 22.
8 mm, the concave groove 66 having a rectangular cross-section
In the same manner as described above, the clearance groove is formed at 0.3 mm.
In addition, three concave grooves 66 are formed every 0.5 mm. The introduction portion 64 has a hole diameter D123.0 m of the counterbore hole 30.
m, and the bottom diameter D5 of the substantially escape groove 66 (22.8 m
m) or a cylindrical portion having a circular diameter D6 slightly smaller than the bottom diameter D5.

[0031]

The plug for a linear motion guide unit according to the present invention is configured as described above, and has the following effects. That is, this plug for a linear motion guide unit is a plug applied to the mounting hole for closing the mounting hole opened on the upper surface of the track rail that constitutes the linear motion guide unit together with the slider, A fitting portion provided on the mounting hole and press-fitted into the mounting hole; and a fitting portion provided on the lower surface side following the fitting portion and before the fitting portion is press-fitted into the mounting hole. And an introduction portion for stabilizing the posture of the plug in the mounting hole is formed in the fitting portion, and the fitting portion has a relief formed at a depth larger than the fitting press-fitting allowance. A groove is formed, and the introduction portion is
Since the plug is formed on the outer peripheral surface having a circular diameter smaller than the hole diameter of the mounting hole, when the plug is applied to the inside of the mounting hole, the plug is formed on the outer peripheral surface having a circular diameter smaller than the hole diameter of the mounting hole. The introduction portion facilitates introduction of the plug into the mounting hole and stabilizes the posture of the plug in the mounting hole before the fitting portion is press-fitted. In that posture stable state,
By fitting and inserting the plug into the mounting hole, the fitting portion is securely pressed into the mounting hole. A plurality of relief grooves formed at a depth larger than the fitting press-fitting allowance are formed in the fitting part, so that the force for press-fitting escapes into the relief groove, and the track rail extends the track groove interval. There is no possibility of causing deformation to swell. As a result, the mounting of the plug into the mounting hole is simpler and more reliable than the conventional synthetic resin plug which is easily depressed into the mounting hole due to the influence of chips, etc., and the load acting on the plug is Even if the size is large, it is possible to provide a structure in which the plug does not easily sink into the mounting hole.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of an insertion plug for a linear motion guide unit according to the present invention.

FIG. 2 is a bottom view of the plug for a linear motion guide unit shown in FIG. 1;

FIG. 3 is a front view showing another embodiment of the plug for a linear motion guide unit according to the present invention.

FIG. 4 is a bottom view of the plug for a linear motion guide unit shown in FIG. 3;

5 is a sectional view showing a state in which the plug for a linear motion guide unit shown in FIG. 1 is attached to a track rail.

6 is a sectional view showing a state where the plug shown in FIG. 3 is attached to a track rail.

FIG. 7 is a partially cutaway perspective view showing a conventional linear motion rolling guide unit.

8 is a cross-sectional view of the track rail of the linear motion rolling guide unit shown in FIG. 7, cut along a plane perpendicular to the longitudinal direction at a mounting hole portion.

9 shows a state in which a metal plug is mounted on an upper part of a mounting hole formed in a track rail of the linear motion rolling guide unit shown in FIG. 7 along a longitudinal direction of the track rail at a mounting hole part of the track rail. It is sectional drawing which shows by cutting.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 track rail 2 slider 3 longitudinal side face 4 first track groove 5 top surface 6 mounting hole 8 base (relative moving member) 10 casing 11 end cap 12 end seal 14 second track groove 20 rolling element (ball) 21 load track path 22 Return passage 26 mounting bolt 27 mounting bolt head 28 lower surface 30 first counterbore hole 33 second counterbore hole 36 chamfered portion 37 counterbore hole 50, 60 plug 51, 61 upper surface 52, 62 lower surface 53, 63 cylindrical outer periphery 54, 64 Introducing portion 55, 65 Fitting portion 56, 66 Concave groove (escape groove) 67 Taper portion U Linear motion rolling guide unit D1 Hole diameter of mounting hole D4 Fitting portion outer diameter D5 Bottom diameter of relief groove D6 Outer diameter H ₁ , height of outer peripheral surface of H ₂ introduction part T ₁ , thickness of T ₂ plug

Claims (10)

[Claims] 1. A plug applied to a mounting hole for closing a mounting hole opened on an upper surface of a track rail constituting a linear motion guide unit together with a slider, wherein the plug is disposed on an upper surface side. And a fitting portion press-fitted into the mounting hole, the fitting portion being disposed on the lower surface side following the fitting portion and being introduced into the mounting hole before the fitting portion is press-fitted into the mounting hole. An insertion portion for stabilizing the posture of the plug in the mounting hole is formed of a cylindrical plate material, and a relief groove formed at a depth greater than a fitting press-fitting margin is formed at the fitting portion. And wherein the introduction portion is formed on an outer peripheral surface having a circular diameter smaller than the diameter of the mounting hole. 2. The plug for a linear motion guide unit according to claim 1, wherein the plug is formed in a circular plate. 3. The plug for a linear motion guide unit according to claim 1, wherein the plug is made of a metal such as aluminum or brass. 4. The linear motion guide unit according to claim 1, wherein said relief groove formed in said fitting portion of said plug is a plurality of concave grooves formed in a rectangular cross section. Plugs. 5. The outer peripheral surface of the introduction portion of the plug,
2. The plug for a linear motion guide unit according to claim 1, wherein the plug is formed to have substantially the same diameter as the bottom diameter of the clearance groove. 6. The outer peripheral surface of the introduction part of the plug,
2. The plug for a linear motion guide unit according to claim 1, wherein the plug has a height of at least 1/5 of the thickness of the plug. 7. The fitting portion of the plug has a tapered portion on the outer peripheral surface on the upper surface side corresponding to a chamfered portion formed on an opening periphery of the mounting hole that opens to the track rail. 2. The plug for a linear motion guide unit according to claim 1, wherein the plug is provided. 8. The linear motion guide unit is mounted on one of the relative moving members by a mounting bolt passing the track rail through the mounting hole, and is provided slidably on the track rail. The plug for a linear motion guide unit according to any one of claims 1 to 7, wherein the slider is applied between the relative moving members by attaching the slider to the other of the relative moving members. 9. The mounting hole includes a second counterbore hole connected to the first counterbore hole and having a diameter larger than the first counterbore hole, above the first counterbore hole into which the head of the mounting bolt is fitted. Equipped, the plug is to close the mounting hole,
9. The plug for a linear motion guide unit according to claim 8, wherein the plug is applied by being press-fitted into the second counterbore hole. 10. The linear motion guide unit is a linear motion rolling guide unit having a track groove formed on a longitudinal side surface of the track rail, and the slider is provided with a track groove opposed to the track groove of the track rail. Is formed, an end cap fixed to both ends of the casing, an infinite circulation path including a load track path formed between the two track grooves and a direction change path formed in the end cap. The linear motion guide unit according to claim 8, further comprising a plurality of rolling elements, and an end seal disposed on an end face of the end cap to seal between the track rail and the slider. Plugging.