JP2010185518A - Linear guide device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a linear guide device capable of preventing a seal member from being damaged or coming off. <P>SOLUTION: This linear guide device is formed with a load rolling element rolling face adjacent directly on the inner face of a sleeve of a slider body, and includes the seal member 45 having a lip 46 slidingly contacting with the outer circumferential face of a guide rail or opposed thereto with a slight clearance, in a member constituting the cage attached to the rolling element raceway track of the linear guide device, and for sealing the rolling element raceway track from the outside of the guide rail, and a recess 46a of a thread portion is formed in the lip 46 in the vicinity of the longitudinal distal end of the seal member 45, while an opposed part to the guide rail of the lip 46 is inclined to go to an opposite side opposite to the rolling element rolling face, along with the motion toward the longitudinal distal end of the seal member 45. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a linear guide (linear motion guide device) used in a machine tool or the like as means for guiding a linearly moving object in its moving direction.

In a conventional linear guide, if foreign matter such as dust or dust enters the rolling surface formed along the side surface of the guide rail, the rolling motion of the rolling element held on the slider side is impaired, and the slider travels. This is a factor that greatly reduces the performance.
Therefore, in addition to the end face seal for preventing the entry of foreign matter from the end face direction, the slider is provided with a pair of upper and lower side seals extending along the guide rail on the inner side. Intrusion of foreign matter from the vertical direction of the guide rail is prevented.

For example, in Patent Document 1 below, a pair of upper and lower dovetail grooves are formed along the longitudinal direction of a cage for holding roller rolling elements, and flexible side seals are respectively attached to these dovetail grooves. Thus, a technique for sealing the rolling surface of the guide rail from above and below is disclosed.
Also, in Patent Document 2 below, a pair of upper and lower side seals are integrally provided along the longitudinal direction of the cage for holding the roller rolling elements, so that the rolling surfaces of the guide rails are similarly provided on the upper and lower sides. A technique for sealing from the above is disclosed.

JP 2006-64007 A JP 2002-39174 A

However, the linear motion guide devices disclosed in Patent Document 1 and Patent Document 2 have room for improvement in the following points (1) and (2).
(1) When the slider is assembled to the guide rail, the longitudinal end of the seal member hits the end surface of the guide rail, and the tip of the lip portion may be bent or damaged. If there is such damage, the sealing performance will deteriorate.
(2) In addition to the case where the slider is assembled to the guide rail, the same problem may occur when a plurality of guide rails are connected and used. That is, if there is a step between adjacent guide rails at the connecting portion of the guide rail, the longitudinal tip of the lip portion of the seal member may hit the step and the seal member may be damaged or dropped off.

  Therefore, the present invention has been made paying attention to the above-mentioned problems, and an object of the present invention is to provide a linear motion guide device that can prevent the seal member from being damaged or dropped off.

A linear motion guide device according to claim 1 of the present invention includes a guide rail and a slider having a U-shaped slider body and straddling the guide rail, and the guide rail rolls on the side surface. The slider body has a loaded rolling element rolling surface on the inner surface of the U-shaped sleeve, and a rolling element formed between the rolling element rolling surface and the loaded rolling element rolling surface. A large number of rolling elements are loaded in the moving body track,
A seal member is provided that has a lip portion that is in sliding contact with the outer peripheral surface of the guide rail or that has a slight gap, and that seals the rolling element raceway from the outside of the guide rail. A linear motion guide device that rolls while being held by a cage in the track, and the slider moves relative to the guide rail,
The lip portion in the vicinity of the longitudinal tip of the seal member has a portion facing the guide rail of the lip portion on the opposite side of the rolling element rolling surface toward the longitudinal tip of the seal member. It is characterized by a relief part that is inclined to face.

  According to the first aspect of the present invention, the relief portion is provided near the tip in the longitudinal direction of the seal member so that the surface facing the guide rail of the lip portion is directed away from the guide rail toward the tip. By doing in this way, when assembling a slider to a guide rail, the front-end | tip of the lip | rip part in the longitudinal direction of a sealing member can be prevented from contacting the end surface of a guide rail. Further, even if the tip of the lip portion in the longitudinal direction of the seal member hits the end surface of the guide rail, the force acting on the lip portion can be reduced. Therefore, damage and dropout of the seal member can be prevented.

A linear motion guide device according to a second aspect of the present invention is the linear motion guide device according to the first aspect, wherein the length of the relief portion along the longitudinal direction of the seal member is L, the lip portion and the guide. L> D, where D is the amount of relief along the rail facing direction.
According to the invention of claim 2, the length L of the relief portion is made larger than the relief amount D of the relief portion, and the relief portion has a gentle inclined surface, so that the relief portion hits the end face or the step of the guide rail. When this occurs, the force generated in the lip portion can be further reduced.

A linear motion guide device according to a third aspect of the present invention is the linear motion guide device according to the first or second aspect, wherein a chamfer is formed at a longitudinal end of the seal member.
According to the invention of claim 3, the force generated in the lip portion when it hits the end face or step of the guide rail can be further reduced, and the effect of preventing damage to the lip portion can be further enhanced.

  According to the present invention, since the relief portion is formed in the seal member, when the slider is assembled to the guide rail, the front end in the longitudinal direction of the lip portion can be prevented from hitting the end surface of the guide rail. Therefore, it is possible to provide a linear guide device that can prevent the seal member from being damaged or dropped off.

It is a perspective view of the linear motion guide apparatus which concerns on 1st Embodiment. It is sectional drawing of the linear motion guide apparatus which concerns on 1st Embodiment. It is sectional drawing which follows the AA line of FIG. It is an enlarged view of the part B of FIG. It is a figure which shows the structure of the sealing member of the linear guide apparatus which concerns on 1st Embodiment, (a) is a perspective view which shows the whole sealing member, (b) is an enlarged view of the part X of Fig.5 (a). It is. It is a figure which shows the structure of the sealing member of the linear guide apparatus which concerns on 1st Embodiment, and is the figure seen from the Y direction of FIG. It is a principal part expanded sectional view of the linear motion guide apparatus which concerns on 2nd Embodiment. It is a principal part expanded sectional view of the linear motion guide apparatus which concerns on 3rd Embodiment. It is a principal part expanded sectional view of the linear motion guide apparatus which concerns on 4th Embodiment. It is sectional drawing of the conventional linear motion guide apparatus. It is an enlarged view of the part C of FIG.

Embodiments of a linear guide apparatus according to the present invention will be described below with reference to the drawings.
(First embodiment)
First, a first embodiment will be described with reference to FIGS. 1 is a perspective view of a linear motion guide device according to the present embodiment, FIG. 2 is a linear motion guide device according to the present embodiment, FIG. 3 is a cross-sectional view taken along line AA in FIG. 2, and FIG. FIG.

The linear motion guide device 1 has a boundary portion between the inner surface 12 of the U-shaped sleeve portion 11 of the slider main body 10 and the hem of the mountain-shaped protrusion 14 described below, and the configurations of the cages 27a and 27b. It has the same configuration as the conventional one described above. Constituent parts similar to those of the conventional one described above are denoted by the same reference numerals.
As shown in FIG. 1, the linear motion guide device 1 of this embodiment includes a guide rail 2 and a slider 7. The guide rail 2 has valley-shaped depressions 4 on both side surfaces 3, and rolling element rolling surfaces 5 a and 5 b are formed in the depressions 4.

A slider 7 having a U-shaped cross section is laid over the guide rail 2.
The slider 7 includes a slider body 10 and end caps 8 attached to the front and rear of the slider body 10.
As shown in FIG. 2, the slider body 10 has a mountain-shaped protrusion 14 on the inner side surface 12 of the U-shaped sleeve portion 11, and the load rolling element rolling surface 15 a, respectively, on both slopes of the protrusion 14. 15b is formed. The loaded rolling element rolling surface 15a faces the rolling element rolling surface 5a, and a rolling element raceway 16a is formed between them. The loaded rolling element rolling surface 15b faces the rolling element rolling surface 5b. A rolling element raceway 16b is formed between them.

  In each of the U-shaped sleeve portions 11 of the slider body 10, rolling element return passages 17a and 17b are respectively formed. In each of the U-shaped sleeve portions 8s of the end cap 8, 2 A book turning path 9 is formed. The rolling element raceway 16a and the rolling element return path 17a are connected via one direction changing path 9 of the sleeve 8s to form an annular endless circulation circuit 18a, and the rolling element raceway 16b and the rolling element return path 17b. Are connected via the other direction change path 9 to form an annular endless circuit 18b.

The endless circulation circuits 18a and 18b are loaded with a large number of roller-like rolling elements 23, and a separator 24 having a guide protrusion 25 is inserted between the roller-like rolling elements 23 (see FIG. 3). .
The protrusion 14 has a groove 21c at its ridge, and the groove 21c is configured to be fitted to a second member 29 that forms a part of cages 27a and 27b described later.

  A shallow groove 21a having a trapezoidal cross section is formed at the hem portion of the protrusion 14 and at the boundary portion between the load rolling element rolling surface 15a and the inner side surface 12 of the sleeve portion 11, and the groove 21a is sandwiched therebetween. The load rolling element rolling surface 15a and the inner side surface 12 of the sleeve portion 11 are adjacent to each other, and the trapezoidal cross section of the groove 21a is continuous in the longitudinal direction. Similarly, a shallow groove 21b having a trapezoidal cross section is formed at a boundary portion between the loaded rolling element rolling surface 15b and the inner side surface 12 of the sleeve portion 11, and the loaded rolling element rolling is sandwiched between the grooves 21b. The surface 15b and the inner side surface 12 of the sleeve portion 11 are adjacent to each other, and the trapezoidal cross section of the groove 21b is continuous in the longitudinal direction. And the groove | channel 21a is comprised so that fitting with the 4th member 32a of the holder | retainer 27a is possible, and the groove | channel 21b is also comprised so that fitting with the 4th member 32b of the holder | retainer 27b is possible.

  Further, of the side wall surfaces on both sides in the width direction in the groove 21a, the side wall surface on the load rolling element rolling surface 15a side is on the same plane as the load rolling element rolling surface 15a, and the load rolling element rolling surface 15a. It is continuous. Similarly, among the side wall surfaces on both sides in the width direction in the groove 21b, the side wall surface on the load rolling element rolling surface 15b side is on the same plane as the load rolling element rolling surface 15b, and the load rolling element rolling surface is It is continuous to 15b.

  On both sides in the width direction of the load rolling element rolling surface 15a, cages 27a that are continuous in the longitudinal direction of the load rolling element rolling surface 15a are mounted, and on both sides in the width direction of the load rolling element rolling surface 15b, A cage 27b continuous in the longitudinal direction of the load rolling element rolling surface 15b is mounted. The retainer 27a includes a first member 28, a second member 29, a third member 30a, and a fourth member 32a, and the retainer 27b includes the first member 28, the second member 29, and the second member 29a. The first member 28 and the second member 29 form part of the cage 27a and part of the cage 27b. The first member 28, the second member 29, the third members 30a and 30b, and the fourth members 32a and 32b are each made of resin.

  The second member 29 is fitted and fixed in the groove 21c, the first member 28 is pinned on the second member 29, and the fourth members 32a and 32b are respectively inserted in the grooves 21a and 21b. The third member 30a is mounted over the fourth member 32a, and the third member 30b is mounted over the fourth member 32b. The first member 28, the second member 29, the third member 30a, 30b, and the fourth member 32a, 32b each hold both ends in the longitudinal direction by the surface of the end cap 8 facing the slider body 10. Being fixed.

  The first member 28, the second member 29, the third member 30a, and the fourth member 32a are exposed in the rolling element raceway 16a, and the exposed surface of the first member 28 and the second member The exposed surface of 29 forms an inner wall surface on one side in the width direction in the rolling element raceway 16a, and the exposed surface of the third member 30a and the exposed surface of the fourth member 32a are in the rolling element raceway 16a. An inner wall surface on the other side is formed. Similarly, the first member 28, the second member 29, the third member 30b, and the fourth member 32b are exposed in the rolling element raceway 16b, and the exposed surface of the first member 28 and the second member 28b are exposed. The exposed surface of the member 29 forms an inner wall surface on one side in the rolling element raceway 16b, and the exposed surface of the third member 30b and the exposed surface of the fourth member 32b in the rolling element raceway 16b. An inner wall surface on the other side is formed.

On the inner wall surfaces of the rolling element raceways 16a and 16b, guide grooves 35 that are continuous in the longitudinal direction of the rolling element raceways 16a and 16b are formed, respectively, and the guides of the separators 24 are guided in the guide grooves 35. The projection 25 is engaged so that it can be guided.
On the inner wall surface in the rolling element raceway 16a, the exposed surface of the first member 28 is one of the both end faces of the roller-like rolling element 23 in the rolling element raceway 16a that faces the ridge side of the protrusion 14. At the end surface, a first guide surface 38a is formed to guide a portion on the rolling element rolling surface 5a side with respect to the axis of the roller-like rolling element 23, and the exposed surface of the second member 29 is at the one end surface. A second guide surface 39a is formed to guide a portion of the roller-like rolling element 23 closer to the load rolling element rolling surface 15a than the axial center. Further, on the inner wall surface in the rolling element raceway 16a, the exposed surface of the third member 30a is a roller-like shape on the other end face of the both end faces of the roller-like rolling element 23 facing the skirt side of the protrusion 14. A third guide surface 40a that guides the rolling element rolling surface 5a side of the rolling element 23 from the axial center is formed, and the exposed surface of the fourth member 32a is the roller-shaped rolling element at the other end surface. A fourth guide surface 41a is formed to guide a portion closer to the load rolling element rolling surface 15a than the axis 23.

Similarly, on the inner wall surface in the rolling element raceway 16b, the exposed surface of the first member 28, the exposed surface of the second member 29, the exposed surface of the third member 30b, and the exposed surface of the fourth member 32a. However, a first guide surface 38b, a second guide surface 39b, a third guide surface 40b, and a fourth guide surface 41b for guiding both end surface portions of the roller-like rolling element 23 are formed.
An elastic seal member 45 having a lip portion 46 continuous in the longitudinal direction of the rolling element raceways 16a and 16b is mounted on the third members 30a and 30b, respectively, and the tip of the lip portion 46 is a guide rail. The rolling element raceways 16a and 16b are configured to be able to seal from the outside of the guide rail 1 in sliding contact with the side surface 3 of the second side.

Here, FIG. 5 is a diagram showing the configuration of the seal member in the present embodiment, (a) is a perspective view showing the entire seal member, and (b) is an enlarged view of a portion X in FIG. 5 (a). is there. FIG. 6 is a view showing the configuration of the seal member in the present embodiment, and is a view seen from the Y direction of FIG.
As shown in FIG. 5, the seal member 45 is formed with a relief portion 46 a in the vicinity of the distal end in the longitudinal direction so that the lip portion 46 becomes farther from the guide rail 2 toward the distal end. Specifically, the height to the top of the lip 46 which is not escaping portion 46a is formed from the surface of the body portion 45a and h ₁ in the sealing member 45, from the end of the relief portion 46a from the surface of the body portion 45a When the height to the top of the separated lip portion 46 is h ₂ and the height from the surface of the main body 45a to the top of the lip portion 46 near the end of the escape portion 46a is h ₃ , h ₁ > h _2> h ₃ is satisfied so that the relief portion 46a is formed.

As a material of the seal member 45, a synthetic resin (for example, a thermoplastic elastomer) is preferable. Further, the seal member 45 is formed without having a cored bar. Therefore, the seal member 45 can be manufactured at low cost, and separation and disposal are easy.
Here, conventionally, since the strength of the whole sealing member is lower in the sealing member having no cored bar than that having the cored bar, damage such as bending or breaking of the whole sealing member is particularly likely to occur. However, by providing a relief part on the seal member as in this embodiment, it is possible to make it difficult to cause damage. Therefore, even if it does not have a mandrel, it is difficult to cause damage such as bending or breakage, and it is easy to put to practical use. An apparatus can be provided.

  Further, as shown in FIG. 6A, the length L of the escape portion 46a may be made larger than the escape amount D of the escape portion 46a so that the escape portion 46a has a gentle inclined surface. By making the relief portion 46a into such a gently inclined surface, the force generated in the lip portion 46 when the relief portion 46a hits the end face or the step of the guide rail 2 can be further reduced. Specific dimensions of the length L and the escape amount D are, for example, L = about 11 mm and D = about 0.05 to 0.1 mm.

Further, as shown in FIG. 6B, a chamfer 46b may be provided at the tip of the lip portion 46 in addition to the escape portion 46a. The specific dimension of this chamfer is, for example, an R chamfer with a radius of 0.15 mm. Thus, by providing the chamfer 46b, the effect of preventing the lip portion 46 from being damaged can be further enhanced.
In the present embodiment, it is preferable that the lip portion 46 at the center of the longitudinal direction of the seal member 45 is pressed against and contacts the guide rail 2 with a tightening margin of about 0.05 to 0.1 mm. The lip portion 46 at the center of the longitudinal direction of the seal member 45 may be a fine gap seal that faces the guide rail 2 with a slight gap (for example, about 0.1 mm).

  The linear motion guide device using such a seal member can prevent the longitudinal tip of the lip portion of the seal member from hitting the end surface of the guide rail when the slider is assembled to the guide rail. Moreover, even if the longitudinal tip of the lip portion of the seal member hits the end surface of the guide rail, the force acting on the lip portion can be reduced. Therefore, damage and dropout of the seal member can be prevented.

Further, when a plurality of guide rails are connected, even when there is a step between adjacent guide rails, the seal member can be prevented from being damaged or dropped out in the same manner.
Since the first member 28, the second member 29, the third member 30a, 30b, and the fourth member 32a, 32b are each formed of resin, the cages 27a, 27b can be made cheaper and easier. It can be manufactured.

  Since both ends of the fourth members 32a and 32b in the longitudinal direction are fixed to the surfaces of the end cap 8, the depths of the grooves 21a and 21b are set in order to fix and attach the fourth members 32a and 32b to the slider body 10. There is no need to go deep. Accordingly, the depth of the grooves 21a and 21b is sufficient, and the thickness of the sleeve 11 of the slider body 10 is less reduced by the grooves 21a and 21b, and the rigidity of the slider body 10 is greatly reduced. Even if an external force is applied to the slider body 10 and the amount of distortion in the sleeve portion 11 of the slider body 10 is increased, the slider body 10 has a great durability against the distortion. Further, by adjusting the depth of the grooves 21 a and 21 b, rigidity corresponding to the external force acting on the slider body 10 can be imparted to the slider body 10.

  Since the fourth members 32a and 32b having the fourth guide surfaces 41a and 41b are formed from members different from the slider body 10, the slider body 10 is manufactured by sliding with the end face of the roller-like rolling element 23. There is no need to form a shape such as a step in contact with the slider body 10 integrally. Therefore, manufacture of the slider main body 10 becomes easy and the manufacturing cost of the linear motion guide device 1 is suppressed.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIG. The linear motion guide device 1 according to the second embodiment has the same configuration as the linear motion guide device according to the first embodiment, except for the points described below. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

FIG. 7 is an enlarged cross-sectional view of a main part of the linear motion guide device according to the second embodiment.
As shown in FIG. 7, the seal member in this embodiment can be applied to a linear motion guide device disclosed in Japanese Patent Application Laid-Open No. 2007-303620. In the present embodiment, the under seal 102 has sufficient strength (rigidity) to secure the desired sealing performance by bringing the lip portion into contact with the guide rail, while the seal groove 103a provided in the end caps 103, 103. , 103a is provided with elasticity to the extent that it can be bent when inserting the insertion portions 102a, 102b.

  As for the under seal provided on the bottom surface of the slider of the linear guide device configured in this way, as in the first embodiment, a relief portion and / or a lip portion that is a contact surface with the rail of the under seal. A chamfer can be provided. Thereby, similarly to the first embodiment, damage to the tip can be prevented.

(Third embodiment)
Next, a third embodiment will be described with reference to FIG. The linear motion guide device 1 according to the third embodiment has the same configuration as the linear motion guide device according to the first embodiment except for the points described below. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

FIG. 8 is an enlarged cross-sectional view of a main part of the linear motion guide device according to the third embodiment.
As shown in FIG. 8, the seal member in this embodiment can be applied to a linear motion guide device disclosed in Japanese Patent Application Laid-Open No. 07-301232. In the present embodiment, the ball cage 210 covers a core material (not shown) with rubber or a synthetic resin material (hereinafter referred to as a rubber material), and the ball holding portion 213 and the inner seal portion 214 are formed on both side edges. And are provided. The inner seal portion 214 is in contact with at least the upper surface of the guide rail 201 among the upper surface of the guide rail 201 or the inner surface of the slider 202 opposed thereto.

Specifically, this ball cage 210 is made of a rubber material made of an iron or non-ferrous metal plate core material in which locking portions (not shown) protruding in the axial direction are formed at both ends of a rectangular longitudinal direction. 212 is formed by coating. In the rubber material 212, both side edges of the core material are particularly thick, and a ball holding portion 213 made of an arc-shaped concave groove is formed long along the side edge.
Further, inner seal portions 214 are provided on both side edges in parallel with the ball holding portion 213. The inner seal portion 214 includes upper and lower projecting pieces 214a and 214b each having an arrowhead-like cross section extending gradually from the thick rubber material 212 at the side edge toward the inside. The tip of the upper protrusion 214a constitute the inner seal lip 214L ₁ in contact with the slider inner surface 202a of the recess 202d of the slider 202 in the attached state of the ball holding portion 213.

The tip of the lower projecting piece 214b constitutes the inner seal lip 214L ₂ similarly in contact with the upper surface 201a of the guide rail 201 in the attached state.
As with the first embodiment, the inner seal of the linear guide apparatus configured as described above can be provided with a relief portion and / or a chamfer at the lip portion that is a contact surface with the rail of the inner seal. Thereby, similarly to the first embodiment, damage to the tip can be prevented.

(Fourth embodiment)
Next, a fourth embodiment will be described with reference to FIG. The linear motion guide device 1 according to the fourth embodiment has the same configuration as the linear motion guide device according to the first embodiment except for the points described below. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

FIG. 9 is a perspective view of the linear motion guide device according to the fourth embodiment. Specifically, FIG. 9 is a view of the linear motion guide device according to the fourth embodiment as viewed from below. It is a perspective view which shows the state before attaching.
As shown in FIG. 9, the seal member in the present embodiment can be applied to a linear motion device disclosed in Japanese Patent Laid-Open No. 2005-016588. The linear motion guide device according to this embodiment includes a guide rail 301, a slider 302, and a plurality of balls (rolling elements, not shown).

  The guide rail 301 has rolling grooves 311 extending in parallel to the longitudinal direction on both side surfaces. The slider 302 includes leg portions 302A disposed on both sides in the width direction of the guide rail 301, and a horizontal portion 302B that couples both leg portions 230A. The horizontal portion 302B is disposed on one end side in the thickness direction of the guide rail 301 (in this figure, the lower surface side of the guide rail 301). Then, both inner side surfaces of the slider 302 are disposed opposite to both side surfaces of the guide rail 301.

The slider 302 includes a main body 340 having a rolling groove (not shown), a frame 350 having a return passage (not shown) and an inner groove (not shown) of the direction changing path, and a direction changing path. And an end cap 360 having an outer groove (not shown).
A gap between both side surfaces of the guide rail 301 having the rolling grooves 311 and the inner side surface of the slider 32 facing the rolling groove 311 is sealed by an under seal 309 on the tip end side of the leg portion 302A of the slider 302. That is, the under seal 309 is integrated with the frame body 350.

As for the under seal integrated with the frame of the linear guide device configured as described above, as in the first embodiment, the lip portion which is the contact surface with the rail of the under seal has a relief portion and / or a chamfer. Can be provided. Thereby, similarly to the first embodiment, damage to the tip can be prevented.
In each of the above-described embodiments, the first member 28, the second member 29, the third members 30a and 30b, and the fourth members 32a and 32b can be formed of metal. By forming the first member 28, the second member 29, the third member 30a, 30b, and the fourth member 32a, 32b from metal, these members 28, 29, 30a, 30b, 32a, 32b are formed. However, even if force or heat is applied in sliding contact with the roller-like rolling elements 23 and the separator 24, they are not easily damaged. In the present embodiment, the description has been made using the roller-like rolling element as an example of the rolling element, but the present invention is not limited to this, and a spherical rolling element may be used.

DESCRIPTION OF SYMBOLS 1 Linear motion guide apparatus 2 Guide rail 3 Guide rail side surface 4 Valley-shaped hollow 5a, 5b Rolling body rolling surface 7 Slider 8 End cap 9 Direction change path 10 Slider main body 11 Both sleeve parts of slider main body 12 Both slider main bodies Inner side surface of sleeve 14 Mountain-shaped protrusion 15a, 15b Load rolling element rolling surface 16a, 16b Rolling element raceway 17a, 17b Rolling element return path 18a, 18b Infinite circulation circuit 21a, 21b, 21c, 21d Groove 23 Roller shape Rolling element 24 Separator 25 Guide protrusion 27a, 27b Cage 28 First member 29 Second member 30a, 30b Third member 32a, 32b Fourth member 35 Guide groove 38a, 38b First guide surface 39a, 39b Second guide surface 40a, 40b Third guide surface 41a, 41b Fourth guide surface 43a, 43b ４５ 45 Seal portion 46 lip 46a relief portion 46b chamfered portion 48 reinforcement plate

Claims (3)

A guide rail, and a slider body having a U-shaped cross section and straddling the guide rail. The guide rail has a rolling element rolling surface on a side surface, and the slider body has a U-shaped sleeve. A rolling element rolling surface on the inner side surface of the part, and a large number of rolling elements are loaded in the rolling element raceway formed between the rolling element rolling surface and the loaded rolling element rolling surface,
A seal member is provided that has a lip portion that is in sliding contact with the outer peripheral surface of the guide rail or that has a slight gap, and that seals the rolling element raceway from the outside of the guide rail. A linear motion guide device that rolls while being held by a cage in the track, and the slider moves relative to the guide rail,
The lip portion in the vicinity of the longitudinal tip of the seal member has a portion facing the guide rail of the lip portion on the opposite side of the rolling element rolling surface toward the longitudinal tip of the seal member. A linear motion guide device characterized in that an escape portion inclined to face is provided.   2. The length of the relief portion along the longitudinal direction of the seal member is L, and the escape amount along the facing direction of the lip portion and the guide rail is D, L> D. The linear motion guide device described in 1.   The linear motion guide device according to claim 1, wherein a chamfer is formed at a longitudinal end of the seal member.

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