JP2012229752A - Slider of linear guide device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow uniform lubrication to be performed in a turnaround path formed on both leg parts, even if a linear guide device is used while the both leg parts of a slider are vertically arranged.SOLUTION: A cross section area of an oil passage formed by an oil feeding groove 2 of an end cap 1 and a surface on an end cap side of a slider body satisfies the following equation (1): h=2Tcos θ/ρgr. In the equation, h: raised height (m) of liquid surface of lubricating oil in the oil passage, T:surface tension (N/m) of lubricating oil in the oil passage, θ: a contact angle (°) of lubricating oil in the oil passage, ρ: density (kg/m) of lubricating oil, g: gravity (m/s), r:length (m) of a diagonal line of a rectangle forming the cross section of the oil passage.

Description

  The present invention relates to a slider of a linear guide device.

  The linear guide device includes a guide rail, a slider, and a plurality of rolling elements. The guide rail and the slider have a rolling groove (a rolling surface when the rolling element is a “roller”) that are arranged to face each other and form a rolling passage of the rolling element. The slider further includes a return path for the rolling elements and a direction changing path for communicating the return path and the rolling path. The rolling path, the return path, and the direction changing path constitute a circulation path of the rolling element, and the rolling element circulates in the circulation path so that one of the guide rail and the slider is relative to the other. Move in a straight line.

  In the slider of such a linear guide device, an end cap is fixed to the end portion of the slider body in the linear movement direction. The end cap includes leg portions disposed on both sides in the width direction of the guide rail, and a trunk portion that extends in a direction orthogonal to the both leg portions and connects the both leg portions. And the outer side groove | channel of the direction change path of a rolling element is formed in the surface at the side of the slider main body of both leg parts, and the oil filler opening is formed in the trunk | drum. The end cap is formed with an oil supply groove from the oil supply port toward the direction change path.

  In the example shown in FIG. 10, upper and lower two-stage direction change paths 5 a and 5 b are formed on both leg portions 13 of the end cap 1. The upper direction change path 5 b is formed by outer grooves 14 a and 14 b formed on the slider main body side surface of the leg portion 13 and an inner raceway surface 41 of the second return guide 40. The lower direction change path 5 a is formed by an outer groove 14 c formed deeper than the outer grooves 14 a and 14 b on the surface of the leg portion 13 on the slider body side, and an inner raceway surface 310 of the first return guide 30. .

The right leg 13 in FIG. 10 shows a state after the first return guide 30 and the second return guide 40 are attached, and the left leg 13 shows the first return guide 30 and the second return. The state before the guide 40 is attached is shown.
In the example of FIG. 10, an oil supply port 15 is formed at the center of the body portion 11 of the end cap 1, and oil supply ports 18 are also formed on both side surfaces of the body portion 11. Also, on the surface of the slider main body side, an oil supply groove 19 extending in parallel with the body portion 11 and connected to the oil supply port 18, and an oil supply groove branched from the oil supply groove 19 at a right angle to reach the outer grooves 14 a to 14 c of the leg portion 13. 20 is formed. A groove 42 that is continuous with the oil supply groove 20 is formed on the outer surface of the second return guide 40. Reference numeral 16 denotes a through hole through which the mounting bolt of the end cap 1 is passed.

By fixing the end cap 1 to both ends of the slider body, an oil passage is formed between the end surface of the slider body and the oil supply grooves 19 and 20 of the end cap 1. The lubricating oil introduced from the oil supply port 15 or the oil supply port 18 of the end cap 1 reaches the groove 42 through the oil supply grooves 19 and 20 and is supplied from here to the upper and lower two-stage direction change paths 5a and 5b. .
When such a linear guide device is used with both legs of the slider arranged in the vertical direction, the lubricating oil flows downward due to its own weight, and therefore when the oil is supplied from the oil supply port 15, the oil is directed downward from the oil supply port 15. However, there is a problem that it is difficult to flow into the oil supply groove 19 extending upward from the oil supply port 15. Further, when the oil is supplied from the oil supply port 18 arranged on the upper side, there is a problem that the lubricating oil hardly flows into the oil supply groove 20 of the leg portion 13 arranged on the upper side.

  In order to solve this problem, Patent Document 1 describes that a plurality of grooves (bottom grooves) extending in parallel with the oil supply groove are formed on the bottom surface of the oil supply groove (reference numerals 19 and 20 in FIG. 10). Yes. The groove width is, for example, 100 to 200 μm. Further, it is described that the smaller the groove width of the bottom groove, the better because the lubricating oil easily flows along the oil supply groove due to the capillary phenomenon (the influence of gravity is reduced).

However, the oil supply groove described in Patent Document 1 has a plurality of bottom grooves by providing a groove having a width of 100 to 200 μm on the bottom surface, and these bottom grooves are part of the oil supply groove, And only part of the oil passage formed by the surface of the slider body, the entire oil passage is not capable of moving the lubricating oil by capillary action.
In the following Patent Document 2, the block body in which the oil passage is formed is an end cap that is fitted into a recess provided on the slider body side surface of the body part, and has adhesion to the recess of the block body, It is described that, when both legs are arranged in the vertical direction, a structure in which the lubricant is easily directed to the upper oil passage is obtained by a method excellent in workability and work efficiency. Specifically, a plate material made of a soft elastic material having oil resistance is disposed between the bottom surface of the recess and the oil passage forming surface of the block body, and the flow rate of the lubricant is fitted into the oil passage on the plate material. It is described that the convex part which restrict | limits is provided.

  In Patent Document 3 below, a sealing device (side seal) in which a felt material in which lubricating oil is impregnated in an accommodation chamber in which a portion facing the guide rail is opened is fixed outside the end cap in the axial direction. In addition, it is described that the lubricating oil soaked in the felt material is supplied to all the ball rolling grooves (rolling passages) by capillary action.

JP 2007-146888 A JP 2008-164160 A Japanese Patent Laid-Open No. 10-141371

  In this invention, the oil path of the end cap is formed so that the lubricating oil can move by capillary action, so that even when the linear guide device is used with both legs of the slider arranged vertically, it is formed on both legs. It is an object of the present invention to ensure uniform lubrication on the direction change path.

  In order to solve the above problems, the present invention provides a slider that constitutes a linear guide device together with a guide rail and a rolling element, the main body having a rolling surface of the rolling element and a return passage of the rolling element, and a linear motion of the main body End caps disposed at both ends in the direction, the end caps comprising leg portions disposed on both sides in the width direction of the guide rail, and a trunk portion extending in a direction orthogonal to the both leg portions and connecting the both leg portions. An outer groove that constitutes a direction change path of the rolling element is formed on the body side surface of the both leg portions, and has the following configuration (a) or configuration (b) and the following configuration (c). And

(a) A concave portion is formed on the surface of the body portion on the main body side, and in this concave portion, a block body having an oil supply groove for introducing lubricating oil into the direction changing path, the formation surface of the oil supply groove is defined as a bottom surface of the concave portion. The oil passage is formed by the oil supply groove and the bottom surface, and the body portion has an oil supply port for supplying lubricating oil to the oil passage.
(b) An oil supply groove for introducing lubricating oil into the direction change path is formed on the surfaces of the both leg portions and the body portion on the main body side, and an oil supply port for supplying the lubricating oil to the oil supply groove is formed in the body portion. And an oil passage is formed by the oil supply groove and the end cap side surface of the main body.
(c) The cross-sectional area of the oil passage satisfies the following formula (1).
h = 2T cos θ / ρgr (1)
In the formula, h: height of rise of the lubricating oil level in the oil passage (m), T: surface tension of the lubricating oil in the oil passage (N / m), θ: contact angle of the lubricating oil in the oil passage (°) , Ρ: Lubricating oil density (kg / m ³ ), g: gravity (m / s ² ), r: length of rectangular diagonal line (m) forming the cross section of the oil passage.
Equation (1) indicates the height of water carried by the capillary when r is the inner diameter (m) of the oil passage.

  In the slider of the present invention, since the cross-sectional area of the oil passage formed in the end cap satisfies the formula (1), the lubricating oil moves in the oil passage by capillary action as compared with the case where the oil passage is not satisfied. The percentage that can be done is high. Therefore, the linear guide device provided with the slider according to the present invention is such that the lubricating oil in the oil passage is not easily affected by gravity, and therefore, even when both the legs of the slider are arranged vertically, As a result, the lubricating oil can easily flow into the oil passage uniformly, so that uniform lubrication is achieved in the upper and lower direction change passages as compared with the conventional example.

  According to the slider for the linear guide device of the present invention, since the ratio that the lubricating oil can move in the oil passage of the end cap by capillary action is high, when the linear guide device is used with both legs of the slider arranged vertically However, more uniform lubrication than the conventional example is achieved in the direction change paths formed on both legs.

It is a front view which shows the end cap of 1st Embodiment. It is a front view which shows the end cap main body which comprises the end cap of 1st Embodiment. It is a perspective view which shows the block body which comprises the end cap of 1st Embodiment. It is an expanded sectional view showing the oil way which the end cap of a 1st embodiment has. It is a front view of the block body of FIG. They are both the perspective view (a, b) and sectional drawing (c) of an oil supply groove | channel which show the difference with the block body which comprises the end cap of 1st Embodiment, and the block body described in patent document 2. FIG. It is the front view (a) which shows the block body different from FIG. 3, and its BB sectional drawing (b). It is an expanded sectional view which shows the oil path from which cross-sectional shape differs. It is a front view which shows the surface by the side of the main body of the end cap of 2nd Embodiment. It is a front view which shows the surface by the side of the main body of the end cap of a prior art example.

Embodiments of the present invention will be described below.
The slider for a linear guide device includes a slider body and an end cap. Since the same slider body as that of the conventional example can be used, only the end cap will be described here. Also, the same parts as those of the above-described conventional example (FIG. 10) are denoted by the same reference numerals and the description thereof is omitted.

[First Embodiment]
As shown in FIG. 1, the end cap 1 of this embodiment includes an end cap body 10 shown in FIG. 2 and a block body 3 shown in FIG. 3. 1 and 2 show the surfaces of the end cap 1 and the end cap body 10 on the slider body side.
As shown in FIG. 2, a recess 12 having a shape into which the block body 3 of FIG. 3 is fitted is formed on the surface of the end cap body 10 on the slider body side. The concave portion 12 mainly includes a portion corresponding to the trunk portion 11, and includes a positioning portion 12 a of the block body 3 and a leg portion 12 b extending from the trunk portion 11 toward both the leg portions 13.

In the end cap body 10, outer grooves 14 a to 14 c that form a direction change path of the rollers (rolling elements) 6 are formed on the surface of the both leg portions 13 on the slider body side. By fitting the first and second return guides 30 and 40 into the outer grooves 14a to 14c, the direction change paths 5a and 5b are formed in the same manner as in the above-described conventional example (FIG. 10).
An oil filler port 15 is formed at the center of the body portion 11 of the end cap body 10. In addition, a through hole 16 through which a mounting bolt for the slider body of the end cap 1 is passed is formed in the body portion 11 and the leg portion 13. In the leg portion 13, an oil supply groove 17 is formed from the leg portion 12 b of the recess 12 toward the direction change path. The through hole 16 and the oil filler port 15 of the body part 11 are formed in the recess 12. In addition, oil supply ports 18 are formed on both side surfaces of the body portion 11, and an oil supply passage 18 a at the tip of the oil supply port 18 reaches the side surface 122 of the recess 12, but the oil supply passage 18 a is closed.

As shown in FIG. 3, the block body 3 is formed with an oil supply port 31 that communicates with the oil supply port 15 of the trunk portion 11 and a through hole 32 that communicates with the through hole 16 of the trunk portion 11. An oil supply groove 33 is formed on the surface of the block body 3 on the recess 12 side.
The oil supply groove 33 includes a portion 33a that extends straight from the oil supply port 31 to both sides, a portion 33b that is continuous with the tip and bent so as to pass under the through hole 32 (the leg portion 13 side), and a tip thereof. The portion 33c extends downward to reach the lower end surface of the block body 3, the portion 33d extends upward, and the portion 33e extends along the thickness direction on the lower end surface of the block body 3. The upper portion 33 d extends from the outside of the through hole 32 so as to reach both end surfaces in the width direction of the block body 3. The cross section of the oil supply groove 33 of the block body 3 is square, and the cross section of the oil supply groove 17 of the end cap 1 is formed in the same manner.
On the lower surface of the block body 3, a protrusion 34 that fits into the positioning portion 12 a of the recess 12 is formed. The block body 3 is obtained by injection molding a thermoplastic resin.

The end cap 1 is formed by fitting the block body 3 with the oil supply groove 33 side facing the recess 12, and the oil passage 4 is formed by the oil supply groove 33 and the bottom surface 121 of the recess 12. A cross-sectional view of the oil passage 4 is shown in FIG. The oil passage 4 has a square cross section, and the cross sectional area is designed to satisfy the following equation (1) according to the lubricating oil used.
h = 2T cos θ / ρgr (1)
In the formula, h: height of rise of the lubricating oil level in the oil passage (m), T: surface tension of the lubricating oil in the oil passage (N / m), θ: contact angle of the lubricating oil in the oil passage (°) , Ρ: Lubricating oil density (kg / m ³ ), g: gravity (m / s ² ), r: length of diagonal line (m) forming a cross section of the oil passage.

Since the oil passage formed between the slider body and the oil supply groove 17 of the end cap 1 by fixing the end cap 1 to the slider main body has the same cross section as the oil supply groove 33, It becomes the same state as the oil passage 4.
When the end cap 1 is fixed to the slider body, the oil supply port 15 provided at the center of the body portion is closed, the oil supply passage 18a is opened, and the lubricating oil is supplied from the oil supply port 18 provided on the side surface, the block is formed from the oil supply passage 18a. Lubricating oil enters the oil supply groove 33d of the body 3. Then, as shown in FIG. 5, the lubricating oil reaches all of the oil supply grooves 33 a to 33 e of the block body 3 and travels from the oil supply groove 33 e on the lower end surface of the block body 3 to the oil supply groove 17.

  Here, since the cross-sectional area of the oil supply groove 33 is small and the cross-sectional area of the oil passage 4 formed by the oil supply groove 33 and the bottom surface 121 of the recess 12 satisfies the above equation (1), regardless of the arrangement of the end cap 1. The lubricating oil supplied from the oil supply port 15 of the end cap body 10 to the oil supply port 31 of the block body 3 or from the oil supply port 18 of the end cap body 10 to the oil supply groove 33d of the block body 3 The oil supply grooves 33 a to 33 e reach the oil supply groove 17 of the end cap body 10 from the oil supply groove 33 e on the lower end surface of the block body 3.

The block body 3 of this embodiment is compared with the block body 3A of the comparative example using FIG. When the end cap 1 is fixed to the slider body, both leg portions are arranged in the vertical direction, and the oil is supplied from the oil supply hole 15 provided in the center of the trunk portion, the lubricating oil is supplied to the oil supply ports 31 of the block bodies 3 and 3A. , 31A to the oil supply grooves 33, 33A.
In this case, in the block body 3 of this embodiment, as shown in FIG. 6A, the lubricating oil that has entered the oil supply port 31 moves toward the upper and lower oil supply grooves 33 without being affected by gravity due to capillary action. , Enters the entire oil supply groove 33. And it enters into the oil supply groove | channel 17 of the upper-and-lower leg part 13 from the oil supply groove | channel 33e of the lower end surface of the block body 3, and enters into the up-and-down direction change path 5a, 5b uniformly.

  In the block body 3A of the comparative example, as shown in FIG. 6B, most of the lubricating oil that has entered the oil supply port 31A is directed to the lower oil supply groove 33A under the influence of gravity, and the upper oil supply groove Not going to 33A. Therefore, the oil supply groove 17e on the lower end surface of the block body 3 enters the oil supply groove 17 on the lower leg 13 and enters the lower direction change paths 5a and 5b, but the direction change path 5a on the upper leg 13 is provided. , 5b.

  The difference in cross-sectional dimension between the oil supply groove 33 of the block body 3 and the oil supply groove 33A of the block body 3A is, for example, a ratio as shown in FIG. That is, in the block body 3 of this embodiment, the cross-sectional area of the oil supply groove 33 is much smaller than the block body 3A of the comparative example, and the cross-sectional area of the oil passage 4 formed by the oil supply groove 33 and the bottom surface 121 of the recess 12 is small. The expression (1) is satisfied. On the other hand, the block body 3A of the comparative example has a much larger cross-sectional area of the oil supply groove 33A than the block body 3 of this embodiment, and the oil passage formed by the oil supply groove 33A and the bottom surface 121 of the recess 12 is interrupted. The area does not satisfy the formula (1).

Therefore, according to the slider of this embodiment, even when both the leg portions are arranged in the vertical direction and the linear guide device is used, more uniform lubrication than the comparative example is performed on the direction change path formed on the both leg portions.
Instead of the block body 3 shown in FIG. 3, as shown in FIG. 7, a block body 3 in which a plurality of oil supply grooves 33 are formed may be used. By setting it as the oil supply groove | channel 33 of multiple systems, many lubricating oils can be supplied compared with what formed the oil supply groove | channel 33 of one system | strain.

  The oil supply groove 33 formed in the block body 3 shown in FIG. 7 has two oil supply grooves 33a, 33b, and 33d in parallel with the block body 3 shown in FIG. It has the same oil supply grooves 33c and 33e, and has an oil supply groove 33f that connects the upper oil supply groove 33d and the lower oil supply groove 33b. The cross-sectional area of the oil passage 4 formed by the oil supply groove 33 and the bottom surface 121 of the recess 12 satisfies the equation (1).

In addition, by applying a coating that increases the affinity with the lubricating oil on the inner surface of the oil supply groove 33, the lubricating oil is further capillaryized in the oil passage as compared with the case where such a coating is not applied. It can be easy to move.
Moreover, as shown in FIG. 8, when the cross-sectional shape of the oil supply groove 33 is not rectangular and the side surface is a curved surface that is convex inward, the surface area of the oil passage is larger than that of the rectangular cross-sectional area. Therefore, the lubricating oil can be easily moved in the oil passage by capillary action.

[Second Embodiment]
In the end cap 1 of this embodiment, as shown in FIG. 9, outer grooves 14 a to 14 c that constitute a direction change path of the rollers (rolling elements) 6 are formed on the surface of the both legs 13 on the slider main body side. . By fitting the first and second return guides 30 and 40 into the outer grooves 14a to 14c, the direction change paths 5a and 5b are formed in the same manner as in the above-described conventional example (FIG. 10).

A large-diameter oil supply port 15 opposite to the small-diameter oil supply port 21 on the slider body side is formed in the center of the body portion 11 of the end cap 1 so as to be centered. Oil filler ports 18 are also formed on both side surfaces of the body portion 11. Further, a through hole 16 through which a mounting bolt for the slider body of the end cap 1 passes is formed in the body portion 11 and the leg portion 13 of the end cap 1.
An oil supply groove 2 is formed on the surface of the end cap 1 on the slider body side. The depth of the oil supply groove 2 is shallower than the small-diameter oil supply port 21. The diameter of the small-diameter oil supply port 21 is slightly larger than the width of the oil supply groove 2, and the diameter of the large-diameter oil supply port 15 is adjusted to the oil supply pipe.

  The oil supply groove 2 includes a portion 2a that extends straight from the oil supply port 21 to both sides, a portion 2b that is continuous with the tip and bent so as to pass below the through hole 16 of the body portion 11 (the leg portion 13 side). A portion 2c extending downward to reach the outer groove 14a; a portion 2d extending upward and then bent at a right angle and extending straight at the same height as the portion 2a; It consists of a portion 2e connected to the oil supply passage 18a at the tip of the mouth 18. During normal use, an oil supply pipe is coupled to the oil supply port 15 and the oil supply passage 18a is closed.

By fixing the end cap 1 to the slider body, an oil passage is formed between the surface of the slider body on the end cap 1 side and the oil supply groove 2 of the end cap 1. The cross section of this oil passage is square, and the cross sectional area is designed to satisfy the following equation (1) according to the lubricating oil used.
h = 2T cos θ / ρgr (1)
In the formula, h: height of rise of the lubricating oil level in the oil passage (m), T: surface tension of the lubricating oil in the oil passage (N / m), θ: contact angle of the lubricating oil in the oil passage (°) , Ρ: Lubricating oil density (kg / m ³ ), g: gravity (m / s ² ), r: length of diagonal line (m) forming a cross section of the oil passage.
When the end cap 1 is fixed to the slider body, the oil supply port 15 provided at the center of the body portion is closed, the oil supply passage 18a is opened, and lubricating oil is supplied from the oil supply port 18 provided on the side surface, the arrangement of the end cap 1 Regardless, the lubricating oil enters the oil supply groove 2 from the oil supply path 18a, reaches all the oil supply grooves 2a to 2e, and uniformly enters the upper and lower direction change paths 5a and 5b from the oil supply groove 2c.

Further, when the end cap 1 is fixed to the slider body, both leg portions are arranged in the vertical direction, and the oil is supplied from the oil supply hole 15 provided at the center of the trunk portion, the lubricating oil is supplied from the oil supply port 21 to the oil supply groove 2a. To be supplied. Then, due to the capillary phenomenon, the lubricating oil that has entered the oil supply port 21 is directed to the upper and lower oil supply grooves 2 a without being affected by gravity, enters the entire oil supply groove 2, and enters the oil supply grooves 2 c of the upper and lower legs 13. , Enters the upper and lower direction change paths 5a, 5b uniformly.
Therefore, according to the slider of this embodiment, even when both legs are arranged in the vertical direction and the linear guide device is used, the direction change path formed on both legs is more uniform than the conventional example (FIG. 10). Is done.

The oil supply groove 2 formed in the end cap 1 of FIG. 9 may be a plurality of system oil supply grooves (FIG. 7) similarly to the oil supply groove 33 formed in the block body 3 of the first embodiment. By using a plurality of oil supply grooves, a larger amount of lubricating oil can be supplied as compared to a structure in which one system of oil supply grooves is formed.
In addition, by applying a coating that increases the affinity with the lubricating oil on the inner surface of the oil supply groove 2, the lubricating oil is more capillaryized in the oil passage than when no such coating is applied. It can be easy to move.

Moreover, when the cross-sectional shape of the oil supply groove 2 is not a rectangle and the side surface is a curved surface convex inward (FIG. 8), the surface area of the oil passage becomes larger compared to the case where the cross-sectional area is the same with a rectangle. Therefore, the lubricating oil can be easily moved in the oil passage by capillary action.
Moreover, since the end cap of this embodiment does not use a block body, it can be obtained at a lower cost than the first embodiment.

DESCRIPTION OF SYMBOLS 1 End cap 10 End cap main body 11 End cap trunk | drum 12 The recessed part which fits a block body 12a The positioning part of a recessed part 12b The leg part of a recessed part 121 The bottom face of a recessed part 122 The side surface of a recessed part 13 The leg part 14a-14c of an end cap Constructed outer groove 15 Oil supply port 16 Through hole 17 Oil supply groove from recess to direction change path 18 Oil supply port on side surface 19 Oil supply groove 20 Oil supply groove 2 Oil supply groove formed directly on end cap body side surface 21 Oil supply port 3 Block Body 31 Oil supply port of block body 32 Through hole of block body 33 Oil supply groove provided in block body 34 Projection of block body 30 First return guide 310 Inner raceway surface of first return guide 40 Second return guide 41 First Inner raceway surface of the second return guide 42 Groove of the second return guide a, 5b direction changing passage 6 cylindrical rollers (rolling elements)

Claims (2)

A slider that constitutes a linear guide device together with a guide rail and rolling elements,
A main body having a rolling surface of the rolling element and a return passage of the rolling element, and end caps disposed at both ends of the main body in the linear movement direction,
The end cap consists of leg portions arranged on both sides in the width direction of the guide rail, and a trunk portion that extends in a direction orthogonal to both leg portions and connects both leg portions,
An outer groove that forms a direction change path of the rolling element is formed on the surface of the legs on the main body side,
A concave portion is formed on the body-side surface of the body portion, and a block body having an oil supply groove for introducing lubricating oil into the direction change path is formed in the concave portion with the oil supply groove forming surface facing the bottom surface of the concave portion. Fitted, an oil passage is formed by the oil supply groove and the bottom surface,
The barrel has an oil supply port for supplying lubricating oil to the oil passage,
A slider of a linear guide device, wherein a cross-sectional area of the oil passage satisfies the following expression (1).
h = 2T cos θ / ρgr (1)
In the formula, h: height of rise of the lubricating oil level in the oil passage (m), T: surface tension of the lubricating oil in the oil passage (N / m), θ: contact angle of the lubricating oil in the oil passage (°) , Ρ: Lubricating oil density (kg / m ³ ), g: gravity (m / s ² ), r: length of rectangular diagonal line (m) forming the cross section of the oil passage. A slider that constitutes a linear guide device together with a guide rail and rolling elements,
A main body having a rolling surface of the rolling element and a return passage of the rolling element, and end caps disposed at both ends of the main body in the linear movement direction,
The end cap consists of leg portions arranged on both sides in the width direction of the guide rail, and a trunk portion that extends in a direction orthogonal to both leg portions and connects both leg portions,
An outer groove that forms a direction change path of the rolling element is formed on the surface of the legs on the main body side,
An oil supply groove for introducing lubricating oil into the direction change path is formed on the surface of the body side of the both leg portions and the trunk portion,
The barrel has an oil supply port for supplying lubricating oil to the oil supply groove,
A slider of a linear guide device, characterized in that a cross-sectional area of an oil passage formed by the oil supply groove and the end cap side surface of the main body satisfies the following expression (1).
h = 2T cos θ / ρgr (1)
In the formula, h: height of rise of the lubricating oil level in the oil passage (m), T: surface tension of the lubricating oil in the oil passage (N / m), θ: contact angle of the lubricating oil in the oil passage (°) , Ρ: Lubricating oil density (kg / m ³ ), g: gravity (m / s ² ), r: length of rectangular diagonal line (m) forming the cross section of the oil passage.

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