JP4551871B2 - Linear motion guide unit with plug on track rail - Google Patents

Description

  The present invention relates to a linear motion guide unit including a plug used by being incorporated in a track rail mounting hole in a linear motion guide unit used in various apparatuses such as machine tools and semiconductor manufacturing apparatuses.

  2. Description of the Related Art Conventionally, there has been known a plug applied to an attachment hole in order to close an attachment hole opened on an upper surface of a track rail that constitutes a linear motion guide unit together with a slider. The plug includes a fitting portion that is press-fitted into the attachment hole from the upper surface side of the track rail, and extends downward from the fitting portion, and is inserted into the attachment hole before the fitting portion is pressed into the attachment hole. It is formed from the cylindrical board | plate material which consists of an introduction part introduce | transduced into. The introduction portion has a function of stabilizing the posture of the plug in the attachment hole. The fitting portion is formed with a clearance groove having a depth larger than the fitting press-fitting allowance, and the introduction portion is formed on an outer peripheral surface having a circular diameter smaller than the diameter of the mounting hole. In addition, the plug is a circular plate with a plurality of concave grooves with a rectangular cross section formed on the outer periphery, and is made of a soft metal material such as aluminum or brass. The dimensional influence on the track groove of the track rail is small (see, for example, Patent Document 1).

  A concealing cap that conceals mounting bolts for furniture and the like is also known. The concealment cap is formed on a tongue piece that is divided into a peripheral end portion of the concealment plate and protrudes in a curved shape (see, for example, Patent Document 2).

  A rail mounting hole cap incorporated in a linear guide device is also known. The rail mounting hole cap of the linear guide device includes a cylindrical barrel having an axial slit, a protrusion protruding from the lower portion of the barrel to the outer periphery, and a cap lid having a partially reduced thickness. And an elastic covering member that covers the lid of the cap body and has an outer diameter larger than that of the cap body (see, for example, Patent Document 3).

A cap incorporated in a linear motion guide bearing device is also known. The cap is provided with a plurality of R-projection-shaped fastening margins provided at a plurality of positions at substantially equal intervals in the circumferential direction on the outer peripheral portion of the short cylindrical portion, and the fastening margin portions are disposed below the upper surface of the cap in the axial direction. (For example, see Patent Document 4).
JP 2002-48138 A Japanese Utility Model Publication No. 55-173719 No. 8-7138 JP 2002-227838 A

  The plug for a linear motion guide unit disclosed in Patent Document 1 is an invention relating to the present applicant, but is made of a soft metal material such as aluminum or brass, and is more than a conventional plastic resin plug. It can be attached to the track rail with a large fixing force, and the effect of deforming the track groove of the track rail is small. However, in recent years, there has been a demand for a plug that is durable even in an environment in which cutting powder generated by a machine tool that is subjected to more severe use conditions is scattered.

  Conventionally, some machine devices such as machine tools have been provided with dust-proof measures that cover sliding parts with telescopic covers and bellows, but in recent years, the processing area of machine devices such as machine tools has been expanded, made compact, Due to cost reduction and the like, the number of machines that are exposed by exposing the track rail of the linear motion guide unit to the outside is increasing. In the usage environment where cutting powder from machinery falls on the plugs on the track rail, with the conventional synthetic resin and aluminum plugs, the plug itself and the lip of the end seal of the slider in the linear motion guide unit are worn. There is a problem in durability such as Therefore, it has been demanded that the plug is made of a hard material such as iron, and there has been a problem of how the plug is made of a hard material and formed into a shape.

  In recent years, linear motion guide units incorporated in machinery and equipment are installed in an environment where cutting powder scatters, where the usage conditions are even more severe. At that time, mounting holes formed in the track rails in the linear motion guide unit As a plug for sealing, there has been a demand for a plug that is less likely to be scratched and durable without wear than conventional aluminum plugs. When the slider in the linear motion guide unit is slid on the track rail by driving the mechanical device, the track rail is damaged if the slider plugged into the track rail mounting hole is damaged. The end seal of the slider, which is slidable along the longitudinal direction, slidably contacts the upper surface of the plug, resulting in the early wear of the seal lip and the loss of the sealing function. In addition, if the plug is worn, there will be a gap between the end seal and the sealing function cannot be achieved. In addition, if an accident occurs, such as chips entering the gap and the seal lip is damaged. Therefore, the sealing function of the slider by the end seal is impaired.

  Therefore, it has been demanded that the plug is made of a material such as iron. When the plug is made of iron such as stainless steel, the shape of the aluminum plug or the synthetic resin plug is changed to iron without changing the shape of the rail plug. There is an adverse effect on the track rail, such as the track groove or track surface (hereinafter collectively referred to as the track surface) located on the outer surface is greatly deformed. Therefore, when the plug is made of an iron material, it is required to have a small influence on the track surface of the track rail and to be firmly fixed to the mounting hole. Therefore, an iron plug is required to have a fitting portion that can be flexibly changed so as to be compatible with the mounting hole diameter and that can be fixed appropriately. There is also a need for a plug that can be easily installed on the track rail without the extra effort required to fit the plug into the track rail mounting hole.

  However, the linear guide unit embedding disclosed in the above-mentioned Patent Document 1 is worn in an environment where cutting powder scatters in an environment where the use conditions are more severe in recent years, and the durability is sufficiently satisfied. It was not possible. The concealing cap disclosed in Patent Document 2 is used for assembling furniture, and the linear motion guide unit cannot function sufficiently with respect to dustproof and sliding characteristics, and is not suitable. is there. Furthermore, the cap disclosed in Patent Document 3 is an elastic covering member, which must be fixed to the cap body, is difficult to manufacture with a complicated configuration, and is expensive. was there. In addition, the cap disclosed in Patent Document 4 is required to form an R-protrusion-shaped fastening portion, and is made of a synthetic resin, which is durable in a harsh use environment. It was not satisfactory.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problem. In a linear motion guide unit loaded with rolling elements such as rollers and balls used mainly in a machine device such as a machine tool, the plug is made of a track rail. Equipped with a durable plug that can be easily and stably mounted in the mounting hole and is not damaged by cutting waste made of hard material of iron or stainless steel. It is an object of the present invention to provide a linear motion guide unit having a plug in which the upper surface of the slider is formed on the same surface and does not damage the lip portion of the end seal of the slider.

The present invention, longitudinal track rail raceway surfaces are formed along, and consists slidable slider to the track rail, the Caps for closing a mounting hole opened on an upper surface of the track rail said In the linear motion guide unit provided on the track rail ,
The Caps is composed of iron or stainless steel hard material, and a top plate made of a circular flat plate made on the upper surface substantially identical plane of the track rail, the top plate portion integrally structure the top plate the mounting and hanging consists of a cylindrical skirt forming a back surface in the recess with a thin wall thickness than the wall thickness of the top plate portion, the outer peripheral portion of the embedding plug is an outer periphery of the top plate from the lid portion formed on the outer diameter of the free size of Interference against infarction TECHNICAL said mounting holes the upper use holes, the wall thickness of the skirt portion a periphery of continuation said skirt portion to the lid portion further A concave circumferential groove for forming a thin wall, a fitting part that has a squeeze to the mounting hole following the concave circumferential groove and is fitted into the mounting hole and fixed to the mounting hole ; and a tip portion of connection can the skirt portion into the fitting portion and the to the mounting holes Introducing part or al is formed for introducing guiding the plug, and the relative total height H of the Caps, height equal to the thickness of the top plate portion and the lid portion (1/4) × H, the height of the concave circumferential groove portion is (1/4) × H, the height of the fitting portion is (1/6) × H, and the height of the introduction portion is (1/3) × H. The present invention relates to a linear motion guide unit provided with a plug on a track rail .

  In this linear motion guide unit, the concave circumferential groove portion is formed in an R shape having a large clearance angle on the fitting portion side with respect to the lid portion side. Further, since the plug accumulates foreign matter such as dust and burrs generated at the time of mounting between the peripheral wall surface of the concave groove and the peripheral wall surface of the mounting hole, A reservoir is formed which is a void in shape.

  Further, in this linear motion guide unit, the introduction portion of the embedding plug extends as a free end extending as a tapered portion with a reduced diameter from the fitting portion, or as a stepped portion with a reduced diameter from the fitting portion. Free end.

  Since this linear motion guide unit is configured as described above, the lid portion on the outer peripheral portion of the plug is almost free of gap between the lid portion and the peripheral surface of the mounting hole of the track rail. Foreign matter such as cutting dust and dust that is generated and scattered on the upper surface of the track rail is eliminated from the upper surface of the track rail at the lip of the end seal of the slider, and foreign matter is prevented from entering the mounting hole. The Further, the fitting portion at the outer peripheral portion of the plug is fixed in a tight fit in the mounting hole of the track rail, and the plug is stably fixed to the mounting hole of the track rail. In addition, the introduction part at the outer periphery of the plug can be inserted into the mounting hole in a stable posture of the plug, and has a function to facilitate the mounting of the plug into the mounting hole of the track rail. Have. In particular, the plug is formed of a hard material that is not damaged by, for example, cutting waste generated by a machine tool or the like as described above, but is formed in the above-described shape and size setting conditions. Therefore, even if the plug is attached to the mounting hole of the track rail, it is easily and stably mounted to the mounting hole without adverse effects such as deformation of the track rail on the track surface. In addition, the concave circumferential groove on the outer periphery of the embedding has a gap between the peripheral wall surface of the mounting hole and the peripheral wall surface of the concave groove even if fine foreign matter such as dust enters from between the lid and the mounting hole. Accumulated in the reservoir of the void formed between them, the sliding of the slider is not obstructed, and a smooth sliding motion can always be exhibited. Also, when the plug is attached to the mounting hole Foreign matter such as burrs generated on the track is also accumulated in the above-mentioned space, and is attached to the mounting hole of the track rail so that it does not have an adverse effect such as deformation of the track surface of the track rail.

  The plug provided in the linear motion guide unit according to the present invention has improved characteristics such as durability of the plug disclosed in Japanese Patent Application Laid-Open No. 2002-48138 relating to the present applicant. Hereinafter, with reference to the drawings, an embodiment of a plug installed in a track rail mounting hole in a linear motion guide unit according to the present invention will be described.

  As shown in FIGS. 1, 2, and 3, this linear motion guide unit is optimally applied to a type in which the roller 5 is used as a rolling element, and extends along both side surfaces 37 in the longitudinal direction. A long track rail 1 having a pair of track surfaces 11 (first track surfaces) 1, a slider 2 slidable in the longitudinal direction of the track rail 1, and a track rail 1 and a slider 2 are formed between the track rail 1 and the slider 2. It has a roller 5 that rolls on a circulation path composed of a return path 10 provided on the track path 20 and the slider 2 and a direction change path (not shown). The slider 2 is disposed on both ends of the casing 3 in which the raceway surface 12 (second raceway surface) is formed so as to face the raceway surface 11 of the raceway rail 1 and the upper and lower raceways 20 and the upper and lower raceways. It has an end cap 4 in which a direction changing path communicating with the return path 10 is formed. In this linear motion guide unit, a load track, that is, a track 20 is formed between the track surface 11 of the track rail 1 and the track surface 12 of the casing 3. Four track paths 20 are formed on the sleeve portion 41 of the casing 3 in two rows. The rollers 5 are respectively held and rolled in the track 20 by holding plates 13 attached to the casing 3 and the end cap 4 and disposed in the escape grooves 43 of the track rail 1. In this linear motion guide unit, as shown in FIG. 2, the roller 5 rolls on the track 20 formed between the track surface 11 and the track surface 12, and the roller 5 of the upper track 20 is on the lower side. Circulating to the return path 10, the roller 5 of the lower track 20 circulates to the upper return path 10, so that the slider 2 can slide relative to the track rail 1. In this linear motion guide unit, a lower surface seal 14 is disposed on the lower surface of the casing 3 and the end cap 4, and an end seal 15 having a lip portion 16 is disposed on the end surface of the end cap 4 to form a seal structure. ing. In addition, mounting holes 17 are formed in the track rail 1 in order to fix the track rail 1 to a base 23 such as various devices, workpieces, mounting bodies, and machine bases. The casing 3 is provided with a mounting screw hole 18 for mounting objects such as various devices, workpieces and mounting bodies.

  As shown in FIG. 1, the end cap 4 is positioned with respect to the casing 3 and is fixed to the casing 3 with bolts 40 through the mounting holes of the end cap 4. The end cap 4 is provided with an oil supply port 42 and an oil supply groove (not shown), and the end cap 4 passes through the oil supply port 42 and the oil supply groove, and the lubricant is supplied to the circulation path including the raceway 20, the return path 10, and the direction change path. A grease nipple 39 is attached to the oil supply port 42 on the end face (or side face). The pipe 6 is configured to be inserted and fixed in the insertion holes 9 of the casing 3 by the end caps 4 positioned on both sides of the casing 3, whereby the cross section of the return path 10 and the direction change path is rectangular. The shape circulation path is smoothly connected without a step, and the roller 5 can smoothly circulate from the direction change path to the return path 10 and from the return path 10 to the direction change path. The pipe 6 is smoothly inserted into the insertion hole 9 of the casing 3 manually, for example, and is fixed to the slider 2 by fixing the end cap 4 to the casing 3. In this linear motion guide unit, a long pipe 6 is inserted into a fitting insertion hole 9 of a casing 3 constituting the slider 2, and a return path 10 is formed by a through-hole having a rectangular cross section formed inside the pipe 6. It is formed. The return path 10 formed by the pipe 6 is formed in a rectangular size that is slightly larger than the rectangular size of the outer shape of the longitudinal section taken along the axis of the cylindrical roller so that the roller 5 can pass smoothly.

This linear motion guide unit is particularly characterized by a plug 7 fixed to the mounting hole 17 of the track rail 1. The plug 7 is made of iron or stainless steel, which is a hard material, has a large fixing force to the mounting hole 17 of the track rail 1, and has an effect of deforming the track groove or the track surface (hereinafter collectively referred to as the track surface). The structure is also small and the workability is good. In general, the linear motion guide unit is a working environment in which cutting wastes are generated in these working environments when applied to a working environment of a processing machine such as a machine tool. In such an environment, the rolling element is a roller 5. Many types are used. In this linear motion guide unit, the slider 7 is always on the track rail 1 with good sliding characteristics without the plug 7 mounted in the mounting hole 17 of the track rail 1 being damaged by foreign matters such as cutting chips. It is made of a hard material so that Accordingly, the plug 7 is preferably formed by being applied to the track rail 1 in the linear motion guide unit as described above.

  In this linear motion guide unit, mounting holes 17 are formed at predetermined intervals on the upper surface 19 of the track rail 1 in order to fix the track rail 1 to a base 23 such as a bed or a machine base as a mounting counterpart member. Yes. In order to fix the track rail 1 to the base 23 of the mating member, the mounting bolt 8 is inserted into the mounting hole 17, and the mounting bolt 8 is screwed into the screw hole (screw hole) 38 formed in the base 23. The track rail 1 is fixed to the base 23. The mounting bolt 8 is generally a hexagon socket head bolt with a hexagonal hole 44 formed in the head portion 36, and the mounting hole 17 of the track rail 1 is a counterbore hole 34 for receiving the head portion 36 of the bolt 8. And a through hole 35 through which the threaded portion of the bolt 8 passes. The depth of the counterbore 34 in the mounting hole 17 is formed deeper than the length of the head 36 of the bolt 8 so that the plug 7 can be accommodated on the head 36 of the bolt 8. As shown in FIG. 3, the plug 7 is inserted into the upper portion 25 of the mounting hole 17 in which the counterbore hole 34 is formed after the track rail 1 is fixed to the base 23 by the mounting bolt 8. Thus, the upper surface 32 of the plug 7 is fitted flush with the upper surface 19 of the track rail 1. The embedding plug 7 is made of a hard material, but the embedding plug 7 does not deform the mounting hole 17 in a state of being fitted in the mounting hole 17, so that a predetermined distance between the track surfaces 11 of the track rail 1 is obtained. The dimension Pk is small and hardly changes.

  The embedding plug 7 includes a top plate portion 21 formed of a circular flat plate having a flat upper surface 32, and a top plate portion 21, as shown in a front view and a bottom view of FIG. And a cylindrical skirt portion 22 that hangs down from the outer edge 33 of the top plate portion 21. The length of the skirt portion 22 is short, and the total height Η of the embedding plug 7 is small. The top plate portion 21 is formed to be thin overall, and the outer peripheral portion 24 of the plug 7 is an outer peripheral portion of the top plate portion 21, so that the upper portion of the mounting hole 17 is closed with the mounting hole 17. A lid portion 26 having an outer diameter D1 having no gap, a concave circumferential groove portion 30 for forming a thin-walled section in a cross section following the lid portion 26, and a fitting hole 17 is fitted with a shimiro after the concave circumferential groove portion 30 It comprises a fitting portion 27 for fixing, and an introduction portion 28 for introducing and guiding the fitting portion 27 to the mounting hole 17 following the fitting portion 27. The inlet portion 28 of the plug 7 is formed at a free end extending from the fitting portion 27 as a tapered portion with a clearance angle θ1, preferably approximately 15 °, and a reduced diameter. The concave groove portion 30 is formed with a thin cross section between the lid portion 26 and the fitting portion 27 so that the lower fitting portion 27 is fitted with the mounting hole 17 in an appropriate degree of fitting. It has become a thing.

  Since the concave circumferential groove 30 in the outer peripheral portion 24 of the plug 7 is formed with a thin cross section, in the case of iron, the fitting portion 27 is connected to the raceway surface 11 of the raceway rail 1 in correspondence with the size of the mounting hole diameter. It is possible to follow the change flexibly so as to prevent the influence of the above, and to be fixed to the mounting hole 17 appropriately. The embedding plug 7 accumulates foreign matter such as dust and burrs generated when the embedding plug 7 is attached to the mounting hole 17 between the peripheral wall surface of the concave groove portion 30 and the peripheral wall surface of the mounting hole 17. Therefore, a reservoir portion 45 is formed in which the fitting portion 27 side is an R portion 46, for example, a void having a width of 0.2R. The material configuration of the plug 7 depends on the use conditions of the linear motion guide unit, but it is preferable if the upper surface 19 of the track rail 1 and the surface roughness, hardness, etc. can be configured in the same state. Such hard materials can be selected.

The embedding plug 7 is formed with a thin cross-sectional thickness as a whole, and the back surface side, that is, the inside of the embedding plug 7 is formed in the recess 31. Further, the top plate portion 21 is preferably formed so that the total height H of the embedding plug 7 is at most (1/4) × H thickness, preferably (1/4) × H thickness. . Furthermore, the fitting portion 27 is formed to have a total height H of the embedding plug 7 at most (1/6) × H , and preferably has a thickness of approximately ( 1/6 ) × H. Has been. Further, the skirt portion 22 is formed with a thickness that is thinner than the thickness of the top plate portion 21.

The embedding plug 7 is described as follows, for example, when setting conditions on the size are specifically described. Lid outer diameter D1, fitting outer diameter D, introduction minimum diameter D2, total height 総, lid height (length) Η4, fitting height (length) Η1, concave circumferential groove height (Width) Η2, introduction portion height (length) Η3, skirt thickness tb, top plate thickness t, and counterbore inner diameter df (FIG. 3) of mounting hole 17, for example, the following relationship: Have.
The plug 7 is formed in the following relationship regarding the diameter.
D1 ≦ df, D> df, D2 <df
The plug 7 is formed in the following relationship regarding the height.
t ≦ ( 1/4 ) × Η, Η1 ≦ ( 1/6 ) × Η, tb ≦ t,
Η2 ≒ ( 1/4 ) x Η, Η3 ≒ ( 1/3 ) x Η,
Η4 ≒ t
The specific size of the plug 7 is formed as follows.
D1 = approximately φ20 mm, Η = 3, 2 mm, t = 0.7 mm

  Further, with respect to the plug 7, the concave circumferential groove portion 30 is formed in a shape connected to the fitting portion 27 by a concave groove that is rounded up to the R portion 46 following the loosely tapered concave groove from the lid portion 26 side. That is, the concave circumferential groove 27 is a clearance angle θ2 on the lid portion 26 side, preferably an R portion 46 having a large clearance angle on the fitting portion 27 side with respect to approximately 15 °. Since foreign matter such as dust and burrs generated at the time of mounting is accumulated between the peripheral wall surface of the concave groove portion 30 and the peripheral wall surface of the mounting hole 17, the fitting portion 27 side becomes a void at the R portion 46. A reservoir 45 is formed. As a result, when the plug 7 is fitted into the mounting hole 17 of the track rail 1, the concave circumferential groove 30 can cope with the ease of deformation of the fitting portion 27 and the rise of sliding contact scraps. It has become. The plug 7 made of a hard material such as iron has a small influence on the track surface 11 of the track rail 1 in the state of being fitted in the mounting hole 17 of the track rail 1 with the above-described configuration. The fitting portion 27 can be flexibly changed so as to be able to cope with squeeze, and can be fixed to the mounting hole 17 stably and appropriately. Furthermore, the plug 7 only needs to be fitted into the mounting hole 17 and can be easily mounted in the mounting hole 17 without extra effort.

In addition, the linear motion guide unit can be made of stainless steel in an environment where rust prevention is required. Therefore, in response to the track rail 1 made stainless Les scan steel, Caps 7 also those which can be made of stainless steel. Further, in recent linear motion guide units, in semiconductor manufacturing equipment or the like, the track rail 1 is made of ceramic, and the plug 7 can be made of ceramic with respect to the ceramic track rail 1. Monodea Ru.

  Next, with reference to FIGS. 6 and 8, another embodiment of the plug 7A mounted in the mounting hole 17 of the track rail 1 in the linear motion guide unit according to the present invention will be described. The plug 7A is formed in a step portion in which the introduction portion 29 extends straight. The other configuration of the plug 7A is the same as that of the above embodiment. Since the introduction portion 29 of the plug 7A is formed in a step portion that extends straight, when the introduction portion 29 of the plug 7A is inserted into the mounting hole 17 of the track rail 1, the plug 7A becomes the upper surface 19 of the track rail 1. The plug 7 </ b> A is easily fitted in the mounting hole 17. In this case, the diameter D3 of the introduction portion 29 of the plug 7A is formed as D3 <df.

  The linear motion guide unit according to the present invention has a plug installed in a mounting hole in a track rail, and is used by being incorporated in a sliding part of various devices such as a machine tool that becomes a work environment in which cutting waste is generated. It is preferable.

1 is a perspective view showing a linear motion guide unit according to the present invention and including a cross-sectional portion. FIG. It is a cross-sectional view which shows the state cut in the AA plane in the linear guide unit of FIG. FIG. 2 is a cross-sectional view showing a state in which the track rail of FIG. 1 is attached to a base and a plug is fitted into a mounting hole of the track rail. It is a front view containing the cross-sectional part which shows one Example of the embedding plug shown in FIG. It is an expanded sectional view which shows the principal part of the embedding plug of FIG. It is a front view containing the cross-sectional part which shows another Example of the embedding plug shown in FIG. It is an expanded sectional view which shows the principal part of the embedding plug of FIG. It is a bottom view which shows the embedding plug of FIG. 4 or FIG.

DESCRIPTION OF SYMBOLS 1 Track rail 2 Slider 7, 7A Embedding 11, 12 Track surface 17 Mounting hole 19 Upper surface 21 Top plate part 22 Skirt part 24 Outer peripheral part 25 Upper part 26 Lid part 27 Fitting part 28, 29 Introduction part 30 Concave groove part 32 Top 45 Reservoir 46 R Part D Fitting part outer diameter D1 Lid part outer diameter D2 Introduction part minimum diameter H Total height H1 Fitting part height H4 Lid part height t Top plate part thickness tb Skirt part thickness θ2 Clearance angle

Claims (4)

The track rail includes a track rail having a track surface formed along a longitudinal direction and a slider that is slidable on the track rail. In the linear motion guide unit,
The Caps is composed of iron or stainless steel hard material, and a top plate made of a circular flat plate made on the upper surface substantially identical plane of the track rail, the top plate portion integrally structure the top plate the mounting and hanging consists of a cylindrical skirt forming a back surface in the recess with a thin wall thickness than the wall thickness of the top plate portion, the outer peripheral portion of the embedding plug is an outer periphery of the top plate from the lid portion formed on the outer diameter of the free size of Interference against infarction TECHNICAL said mounting holes the upper use holes, the wall thickness of the skirt portion a periphery of continuation said skirt portion to the lid portion further A concave circumferential groove for forming a thin wall, a fitting part that has a squeeze to the mounting hole following the concave circumferential groove and is fitted into the mounting hole and fixed to the mounting hole ; and a tip portion of connection can the skirt portion into the fitting portion and the to the mounting holes Introducing part or al is formed for introducing guiding the plug, and the relative total height H of the Caps, height equal to the thickness of the top plate portion and the lid portion (1/4) × H, the height of the concave groove portion is (1/4) × H, the height of the fitting portion is (1/6) × H, and the height of the introduction portion is (1/3) × H. A linear motion guide unit provided with a plug on a track rail characterized by being formed . The concave peripheral groove, with a Caps the track rail according to claim 1, wherein the fitting portion side with respect to the lid portion is formed on the R shape having a large relief angle straight Motion guide unit. A foreign substance such as dust and burrs generated at the time of attachment is accumulated between the peripheral wall surface of the concave groove and the peripheral wall surface of the mounting hole. The linear motion guide unit having a plug on the track rail according to claim 2 , wherein a portion is formed. The said introducing | transducing part is a free end extended as a taper part of a reduced diameter from the said fitting part, or a free end extended as a step part of a reduced diameter from the said fitting part. A linear motion guide unit comprising the track rail according to any one of 3 provided with a plug .

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