JP4640306B2 - Linear motion guide device - Google Patents

Description

  The present invention relates to a linear motion guide device used as a linear guide in an industrial machine such as a machine tool, an injection molding machine, a semiconductor manufacturing device, a transport device, or an industrial robot.

  A linear motion guide device used as a linear guide in an industrial machine such as a machine tool includes a guide rail and a slider main body having a plurality of slider-side track grooves facing the rail-side track grooves formed on the left and right side surfaces of the guide rail; A large number of rolling elements rolling on the rolling element load rolling path formed between the rail side raceway groove and the slider side raceway groove, and the rolling element rolling on the rolling element load rolling path are placed in the slider body. A pair of end caps having a plurality of direction change paths to be introduced into the formed rolling element return passage, and the slider body includes a rolling element interposed between the rail side raceway groove and the slider side raceway groove. A pair of rolling element holders to be held on the slider side is assembled.

In such a linear motion guide device, when dust such as cutting powder or dust enters between the left and right side surfaces of the guide rail and the slider main body, the rolling motion of the rolling element is hindered. For this reason, for example, in the linear motion guide device shown in Patent Document 1, a pair of seal bodies called under seals are brought into sliding contact with the left and right side portions of the guide rail to seal the left and right sides of the slider body. A strip-shaped metal plate welded with an elastic material such as nitrile rubber is used as the under seal, and the under seal is attached to the slider body by driving a rivet into the seal mounting hole drilled in the slider body. There is a problem that it takes time to install the seal. In view of this, it has been devised that a plate-like underseal support is resin-molded integrally with a rolling element retainer, and an under seal is assembled in a gap formed between the under seal support and the rolling element retainer.
JP-A-6-341919

  However, when the underseal support is resin-molded integrally with the rolling element retainer, there is a problem that the formability of the rolling element retainer is lowered, and molding defects such as sink marks and warpage tend to occur. In addition, since the under seal is made of a soft material such as a thermoplastic elastomer, if the under seal assembled between the rolling element cage and the under seal support is displaced in the longitudinal direction of the guide rail, the seal There was a risk that deformation that would greatly reduce the function occurred in the underseal. Also, if the seal lip of the under seal strongly contacts the side surface of the guide rail, a frictional force that causes a decrease in the operability of the slider is generated at the contact portion between the under seal and the guide rail, or the under seal is frequently applied. There has been a problem that the seal lip portion has to be worn out.

  The present invention has been made paying attention to the above-described problems, and an object thereof is to provide a linear motion guide device capable of suppressing deformation of a rolling element cage due to molding. Another object of the present invention is to provide a linear motion guide device capable of preventing a deformation that greatly reduces the sealing function from occurring in an under seal.

In order to achieve the above object, the invention of claim 1 includes a guide rail and a slider body having a plurality of slider-side track grooves facing the rail-side track grooves formed on the left and right side surfaces of the guide rail; A number of rolling elements that roll on a rolling element load rolling path formed between the rail side raceway groove and the slider side raceway groove, and a rolling element that rolls on the rolling element load rolling path is the slider. A pair of end caps having a plurality of direction change paths to be introduced into a rolling element return passage formed in the main body, a pair of rolling element holders assembled to the slider body, left and right side portions of the guide rail, and A pair of under seals having a seal lip portion for sealing between the slider body and a plate-like under seal support integrally molded with the rolling element holder; and the rolling element holder; A linear guide apparatus capable Installing assembled removably to the under seal in the gap portion formed between, and the rolling element cage and the under seal support are connected intermittently, adjacent to the guide rail A plurality of notches are provided at a side end portion of the under seal opposite to the side to be operated, and a plurality of positioning is performed so that the under seal is immovably positioned in the longitudinal direction of the guide rail by fitting with the notches. A part is provided in the rolling element holder .

  According to a second aspect of the present invention, in the linear motion guide device according to the first aspect, the rolling element holder causes the rolling element that rolls on the rail-side raceway grooves formed on the left and right side upper portions of the guide rail to be on the slider side. A first rolling element holding portion for holding, a second rolling element holding portion for holding a rolling element that rolls on a rail-side raceway groove formed in the lower part of the left and right side surfaces of the guide rail on the slider side, and the second A plate part that has a third rolling element holding part provided between the rolling element holding part and the first rolling element holding part, and abuts against an end surface part of the slider body. It has in the one end part and other end part of a 3rd rolling element holding | maintenance part, It is characterized by the above-mentioned.

According to a third aspect of the present invention, there is provided the linear motion guide device according to the first or second aspect, wherein the positioning portion is provided in the rolling element holder so as to intermittently connect the rolling element holder and the under seal support. It is provided .

According to a fourth aspect of the present invention, in the linear motion guide device according to the third aspect , the positioning portion is formed integrally with the rolling element holder, and the rolling element holder and the under seal support are partially formed. It is provided so that it may connect, and it is provided in the longitudinal direction both ends of the said rolling element holder | retainer at least .

According to a fifth aspect of the present invention, in the linear motion guide device according to any one of the first to fourth aspects, the under seal has a lip portion that is in sliding contact with the guide rail, and the lip portion is integrated in the longitudinal direction. It is characterized by a connected structure.
According to a sixth aspect of the invention, the linear guide apparatus of any one of claims 1 to 5, wherein the under-seal is formed of a material having flexibility and abrasion resistance.

The invention according to claim 7 is the linear motion guide device according to any one of claims 1 to 6 , wherein the under seal support has a chamfered portion at a portion in contact with the under seal.
The invention of claim 8 is the linear guide apparatus of any one of claims 1 to 7, the under seal and having a chamfered portion at a portion in contact with the positioning portion.

According to a ninth aspect of the present invention, in the linear motion guide device according to any one of the first to eighth aspects, the positioning portion has a chamfered portion at a portion in contact with the under seal.

In the linear motion guide device according to the first and second aspects of the present invention, since the rolling element retainer and the under seal support are intermittently connected, the formability of the rolling element retainer is improved. The deformation of the cage can be suppressed and the rigidity of the rolling element cage can be increased. In addition, by assembling the under seal between the rolling element retainer and the under seal support formed integrally with the rolling element retainer, it is possible to secure a thick retainer and improve the rigidity of the retainer. .
In the linear motion guide device according to the first aspect of the present invention, the under seal assembled in the gap between the rolling element cage and the under seal support does not cause displacement in the longitudinal direction of the guide rail. It is possible to prevent the under seal from undergoing deformation that greatly reduces the sealing function.

In the linear motion guide device according to the third aspect of the present invention, molding defects such as sink marks and warpage are unlikely to occur when the rolling element retainer and the under seal support are integrally molded with resin. It is possible to prevent the under seal from undergoing deformation that greatly reduces the sealing function without reducing the moldability of the seal support.

In the linear motion guide device according to the invention of claim 4 , since the slits are not provided in the plate portions at both ends of the cage, the cage is divided into a ball holding portion and an under seal support portion, or an under seal is inserted. Thus, even if a slit is provided, the support force by the plate parts at both ends does not change, and the decrease in the rigidity of the ball holding part is only the influence of the secondary moment of section due to the division, and the reduction in holding ability is minimized. Can do.

In the linear guide apparatus according to the invention 請 Motomeko 5, seal body is continuously integrally.
In the linear motion guide device according to the sixth aspect of the present invention, the seal friction force at the contact portion between the left and right side surfaces of the guide rail and the under seal is reduced, and a stable dustproof performance can be obtained.

In the linear guide apparatus according to claim 7-9, rolling work when assembling the under-seal between the body cage and an under seal support is facilitated, thereby improving work efficiency.

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
1 and 2, reference numeral 10 denotes a linear motion guide device according to the first embodiment of the present invention. The linear motion guide device 10 includes a guide rail 11 and a slider 12. The guide rail 11 is formed in a straight line shape, and two rail-side track grooves 13 are formed along the longitudinal direction of the guide rail 11 on the left and right side surfaces 111 and 112 (see FIG. 3).

The slider 12 includes a slider main body 14 whose section along the width direction of the guide rail 11 has a substantially gate shape, and a pair of end caps 15, 15 attached to both front and rear end faces of the slider main body 14. Two slider-side track grooves 16 are formed on each of the left and right inner side surfaces 141 and 142 (see FIG. 4).
The slider-side raceway grooves 16 are opposed to the rail-side raceway grooves 13 described above, and a large number of spherical rolling elements 17 (see FIG. 2) are formed between the rail-side raceway grooves 13 and the slider-side raceway grooves 16. ) Is provided. These rolling elements 17 roll on a rolling element load rolling path 18 formed between the rail-side raceway groove 13 and the slider-side raceway groove 16 when the slider 12 relatively moves in the longitudinal direction of the guide rail 11. It is like that. And the rolling element 17 which rolled on the rolling element load rolling path 18 enters into the direction change path 19 formed in the end cap 15, and a rolling direction is reversed here.

A plurality of direction changing paths 19 are formed in the end cap 15 corresponding to the rolling element load rolling paths 18, and the rolling elements 17 whose rolling direction is reversed in the direction changing paths 19 are formed along the guide rails 11 along the slider body. 14 is introduced into a plurality of rolling element return passages 20 (see FIG. 2) formed in the inside.
A rolling element 17 interposed between the rail-side raceway groove 13 and the slider-side raceway groove 16 is provided with a pair of rolling element holders 21, 21 ( (See FIG. 5). These rolling element holders 21 are formed of a synthetic resin material, and a first rolling element that holds a rolling element 17 that rolls on a rail-side raceway groove 13 formed on the left and right side surfaces of the guide rail 11 on the slider side. A holding part 211, a second rolling element holding part 212 that holds the rolling element 17 that rolls on the rail-side raceway groove 13 formed in the lower part of the left and right side surfaces of the guide rail 11 on the slider side, and the second rolling element It has the 3rd rolling element holding | maintenance part 213 provided between the holding | maintenance part 212 and the 1st rolling element holding | maintenance part 211 (refer FIG. 6).

  The rolling element holder 21 has plate portions 214 and 215 interposed between the slider body 14 and the end cap 15 at one end and the other end of the rolling element holding portions 211 to 213. Two passage connection holes 216 (see FIG. 6) for connecting the direction change path 19 and the rolling element return passage 20 are formed in the plate portions 214 and 215, respectively. In addition, slits 218 (see FIG. 6) that engage with an under seal 25 described later are formed in the plate portions 214 and 215 of the rolling element holder 21, respectively.

The slider body 14 has block-like rolling element circulation portions 143 and 144 (see FIG. 4) on both the left and right sides of the guide rail 11, and the rolling body circulation portions 143 and 144, the left and right side portions of the guide rail 11, and the like. The space between the two is sealed by a pair of left and right under seals 25, 25 (see FIG. 5).
The end caps 15 and 15 are attached to the front end surface portion and the rear end surface portion of the slider main body 14 by a plurality of end cap fixing screws. A side seal 23 (see FIG. 1) that seals between the cap 15 is attached.

  The under seal 25 has a soft seal lip 251 (see FIG. 7). The seal lip 251 is brought into contact with the side surface of the guide rail 11 to seal between the guide rail 11 and the slider body 14. It is like that. The under seal 25 is formed by molding a soft material such as thermoplastic elastomer, plastic, rubber or the like into a strip shape. A rolling element holder is provided at one end and the other end of the under seal 25 in the longitudinal direction. 21 are formed with hook-shaped misalignment prevention portions 252 and 253 (see FIG. 7) that engage with the plate portions 214 and 215 of the plate 21.

The rolling element holder 21 is provided with a plate-like under seal support 22 that supports the under seal 25 between the second rolling element holder 212 and the seal lip 251 of the under seal 25. Positioning portions 26, 27, and 28 for positioning the under seal 25 are provided at positions that lightly contact the side surface of the rail 11 (see FIG. 6).
The under seal support 22 is formed integrally with the rolling element holder 21. The under seal support 22 is formed in a plate shape, and an under seal 25 is inserted between the second rolling element holding portion 212 and the under seal support 22 at the rail side end of the under seal support 22. A chamfered portion 29 is formed to facilitate this.

  The positioning portions 26 to 28 are formed integrally with the rolling element holder 21. The positioning portions 26 to 28 are provided in the rolling element holder 21 so as to partially connect the second rolling element holding portion 212 and the under seal support 22. The under seal 25 includes positioning portions 26, Cutout portions 30, 31, 32 (see FIG. 7) that fit with 27, 28 are provided at the side end portion opposite to the seal lip portion 251. In order to make it easy to fit the notches 30 to 32 to the positioning portions 26 to 28, chamfered portions 33 (see FIG. 9) are formed in the positioning portions 26, 27, 28, and a plurality of the under seals 25 are provided. The chamfered portion 34 (see FIG. 10) is formed at a plurality of locations.

  In such a configuration, when the under seal 25 is inserted between the second rolling element holder 212 and the under seal support 22 of the rolling element holder 21, the misalignment prevention parts 252 and 253 of the under seal 25 become the rolling elements. An under seal 25 inserted between the second rolling element holder 212 of the rolling element holder 21 and the under seal support 22 is engaged with the plate portions 214 and 215 of the holder 21. It is possible to prevent positional displacement in the direction.

  Further, when the under seal 25 is inserted between the second rolling element holding part 212 and the under seal support 22 of the rolling element holder 21, the notches 30, 31, and 32 formed in the under seal 25 become the rolling elements. It fits into positioning portions 26, 27, 28 provided on the cage 21. Accordingly, the under seal 25 is positioned at a position where the seal lip portion 251 of the under seal 25 slightly contacts the side surface portion of the guide rail 11, and the seal lip portion 251 does not strongly contact the side surface portion of the guide rail 11. In addition, frictional force that causes the operability of the slider 12 to be reduced is generated at the contact portion between the under seal 25 and the guide rail 11, or wear that requires frequent replacement of the under seal 25 is generated at the seal lip portion 251. Can be prevented.

  Further, the notch portions 30, 31, 32 provided in the under seal 25 are fitted into the positioning portions 26, 27, 28 provided in the rolling element holder 21, so that the under seal 25 extends in the longitudinal direction of the guide rail 11. Since the under seal 25 which is positioned so as not to move in the direction and is assembled between the rolling element holder 21 and the under seal support 22 does not cause a positional shift in the longitudinal direction of the guide rail 11, the sealing function is greatly reduced. The deformation to be generated can be prevented from occurring in the under seal 25.

In the embodiment described above, the positioning members 26, 27, and 28 are provided in the rolling element holder 21 so as to partially connect the second rolling element holding part 212 and the under seal support 22. The moldability of the moving body retainer 21 is improved, deformation due to molding can be suppressed, and the rigidity of the rolling element retainer 21 can be increased.
In addition, unlike the linear motion guide device disclosed in Japanese Patent Laid-Open No. 2002-39174, it is not necessary to mold the under seal integrally with the rolling element holding portion, so that the worn under seal can be easily replaced. Can do.

Further, by assembling the under seal 25 between the rolling element holder 21 and the under seal support 22 molded integrally with the rolling element holder 21, the thickness of the rolling element holder 21 can be ensured thick. The rigidity of the moving body holder 21 can be increased.
Moreover, since the chamfered portions 29, 33, and 34 are formed in the under seal support 22, the under seal 25, and the positioning portions 26 to 28, wear of the under seal 25 can be suppressed. Furthermore, the under seal 25 can be easily assembled between the rolling element holder 21 and the under seal support 22, and work efficiency when the under seal 25 is assembled between the rolling element holder 21 and the under seal support 22. Can be increased.

FIG. 11 is a cross-sectional view showing the main part of a linear guide apparatus according to the second embodiment of the present invention. The second embodiment is different from the first embodiment in that the upper surface portion of the under seal 25 is The rolling element holder 21 has a plate-like contact portion 35 that comes into contact.
According to such a structure, since the thickness of the rolling element holder 21 can be ensured thick, the rigidity of the rolling element holder 21 can be increased.

Next, a third embodiment of the present invention will be described with reference to FIGS.
FIG. 12 is a perspective view of a linear motion guide device according to the third embodiment of the present invention, and FIG. 13 is a cross-sectional view of the linear motion guide device according to the same embodiment, and the linear motion guide according to the third embodiment. The apparatus includes a guide rail 11 formed in a straight line, a slider 12 (see FIG. 12) that relatively moves in the longitudinal direction of the guide rail 11, and a number of spherical rolling elements 17 (see FIG. 12) incorporated in the slider 12. 13).

  The slider 12 includes a slider body 14 having four slider-side track grooves 16 (refer to FIG. 13) facing the rail-side track grooves 13 formed on the left and right side upper portions and the left and right side lower portions of the guide rail 11, and the rail-side track grooves 13. And a pair of front and rear end caps 15, 15 having four direction changing paths for changing the direction of the rolling element 17 that has rolled between the slider side raceway groove 16 and the slider main body 14. Four rolling element return passages 20 (see FIG. 13) are formed along the longitudinal direction of the guide rail 11 in order to return the rolling elements 17 whose direction has been changed by the 15 direction change paths.

  A rolling element 17 interposed between the rail-side raceway groove 13 and the slider-side raceway groove 16 is held on the slider side by a pair of left and right rolling element holders 21 and 21 (see FIG. 13) assembled to the slider body 14. ing. These rolling element holders 21 are formed of a synthetic resin material, and a first rolling element that holds a rolling element 17 that rolls on a rail-side raceway groove 13 formed on the left and right side surfaces of the guide rail 11 on the slider side. A holding part 211, a second rolling element holding part 212 that holds the rolling element 17 that rolls on the rail-side raceway groove 13 formed in the lower part of the left and right side surfaces of the guide rail 11 on the slider side, and the second rolling element It has the 3rd rolling element holding | maintenance part 213 provided between the holding | maintenance part 212 and the 1st rolling element holding | maintenance part 211 (refer FIG.14 and FIG.15). The rolling element holder 21 has plate portions 214 and 215 (see FIG. 14) at one end and the other end of the rolling element holding portions 211 to 213. The plate portions 214 and 215 include sliders. Two passage connection holes 216 that connect the rolling element return passage 20 of the main body 14 and the direction change path of the end cap 15 are formed, and the rolling element between the rail side raceway groove 13 and the slider side raceway groove 16 is formed. Two arc-shaped notches 217 forming a rolling element passage are formed between the load rolling path and the direction changing path of the end cap 15 (see FIG. 15).

As shown in FIG. 13, the slider body 14 has rolling element circulation portions 143 and 144 on both the left and right sides of the guide rail 11. These rolling element circulation portions 143 and 144 oppose the left and right side portions of the guide rail 11, and a pair of left and right under seals 25 and 25 (see FIG. 13) are provided between the left and right side portions of the guide rail 11 and the slider body 14. See).
The end caps 15 and 15 are attached to the front end surface portion and the rear end surface portion of the slider body 14 by a plurality of end cap fixing screws. The end caps 15 are connected to the guide rail 11 and the end cap 15. Side seals 23 (see FIG. 12) for sealing the gaps are respectively attached.

  The under seal 25 has a soft seal lip portion 251 (see FIG. 16). The seal lip portion 251 is brought into contact with the side surface portion of the guide rail 11 to seal between the guide rail 11 and the slider body 14. It is configured as follows. The under seal 25 is formed by molding a synthetic resin material such as a thermoplastic elastomer into a strip shape. The plate portion of the rolling element holder 21 is provided at one end and the other end of the under seal 25 in the longitudinal direction. The hook-shaped misregistration prevention portions 252 and 253 (see FIG. 17) that engage with 214 and 215 are formed.

  The rolling element holder 21 is provided with a plate-like under seal support 22 that supports the under seal 25 between the second rolling element holder 212 and the seal lip 251 of the under seal 25. A positioning portion 26 for positioning the under seal 25 is provided at a position where the under seal 25 is lightly contacted with the side surface portion of the rail 11, and a longitudinal end portion of the second rolling element holding portion 212 and a longitudinal end portion of the under seal support 22 are provided. Connecting connecting portions 35 and 36 are provided (see FIGS. 14 and 15).

  The under seal support 22 and the positioning portion 26 are formed integrally with the rolling element holder 21. The positioning unit 26 is provided in the rolling element holder 21 so as to partially connect the second rolling element holding part 212 and the under seal support 22, and the under seal 25 includes the rolling element holder 21. A notch 30 that fits with the positioning portion 26 is provided at a side end opposite to the seal lip 251.

  In such a configuration, when the under seal 25 is inserted between the second rolling element holder 212 and the under seal support 22 of the rolling element holder 21, the misalignment prevention parts 252 and 253 of the under seal 25 become the rolling elements. An under seal 25 inserted between the second rolling element holder 212 of the rolling element holder 21 and the under seal support 22 is engaged with the plate portions 214 and 215 of the holder 21. It is possible to prevent displacement in the direction.

  Further, when the under seal 25 is inserted between the second rolling element holding part 212 and the under seal support 22 of the rolling element holder 21, the notch portion 30 provided in the under seal 25 is attached to the rolling element holder 21. It fits into the provided positioning part 26. Thereby, the under seal 25 is positioned at a position where the seal lip portion 251 of the under seal 25 is lightly in contact with the side surface portion of the guide rail 11, and the seal lip portion 251 strongly contacts the side surface portion of the guide rail 11. Therefore, a frictional force that causes the operability of the slider 12 to deteriorate is generated at the contact portion between the under seal 25 and the guide rail 11, or wear that requires frequent replacement of the under seal 25 is caused by the seal lip portion 251. Can be prevented.

  In addition, using a linear motion guide device having a rolling element diameter of 4.7625 mm and a slider length of 85 mm, the amount of deformation of the cage with and without the under seal support 22 provided on the rolling element cage 21 was tested. As a result, the amount of cage deformation when the under seal support 22 is provided is about 1.6 times that when the under seal support 22 is not provided, and the rigidity of the rolling element cage is that when the under seal support 22 is not provided. It was found to be about 64%.

  Further, a linear motion guide device having a rolling element diameter of 4.7625 mm and a slider length of 85 mm is used, and the rolling element holder 21 is held with and without the under seal support 22 and the connecting portions 35 and 36. As a result of testing the amount of vessel deformation, the amount of cage deformation when the under seal support 22 and the connecting portions 35 and 36 are provided is about 1.2 times that when the under seal support 22 and the connecting portions 35 and 36 are not provided. It has been found that the rigidity of the rolling element cage is about 87% when the under seal support 22 is not provided.

  Therefore, from the above test results, when the under seal support 22 is provided in the rolling element retainer 21, the connecting portions 35 and 36 are connected to the rolling element retainer in order to suppress a decrease in the rigidity of the rolling element retainer. 21 is desirable.

1 is a perspective view of a linear guide apparatus according to a first embodiment of the present invention. It is a partial cross section top view of the linear motion guide apparatus shown in FIG. It is sectional drawing of the guide rail shown in FIG. It is sectional drawing of the slider main body shown in FIG. It is sectional drawing which follows the VV line of FIG. It is a perspective view of the rolling element holder | retainer shown in FIG. It is sectional drawing which shows a part of linear motion guide apparatus which concerns on the 1st Embodiment of this invention. It is a perspective view of the under seal shown in FIG. It is sectional drawing of the positioning part shown in FIG. It is a top view which shows a part of under seal. It is sectional drawing which shows a part of linear motion guide apparatus which concerns on the 2nd Embodiment of this invention. It is a perspective view of the linear guide apparatus which concerns on the 3rd Embodiment of this invention. It is sectional drawing of the linear motion guide apparatus which concerns on the 3rd Embodiment of this invention. It is a front view of the rolling element holder | retainer shown in FIG. It is sectional drawing which follows the XV-XV line | wire of FIG. It is a top view of the under seal shown in FIG. It is a rear view of the under seal shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Guide rail 12 Slider 13 Rail side track groove 14 Slider body 15 End cap 16 Slider side track groove 17 Rolling body 18 Rolling body load rolling path 19 Direction change path 20 Rolling body return path 21 Rolling body holder 22 Under seal support 25 Under seal 26, 27, 28 Positioning part 30, 31, 32 Notch part 35, 36 Joint part

Claims (9)

A guide rail, a slider body having a plurality of slider-side track grooves facing the rail-side track grooves formed on the left and right side surfaces of the guide rail, and formed between the rail-side track groove and the slider-side track groove A plurality of rolling elements rolling on the rolling element loaded rolling path, and a plurality of directions for introducing the rolling elements rolling the rolling element loaded rolling path into the rolling element return passage formed in the slider body. A pair of under caps having a pair of end caps having a diversion path, a pair of rolling element holders assembled to the slider body, and a seal lip portion that seals between the left and right side portions of the guide rail and the slider body and a seal, wearing the under seal to the gap formed between the rolling element cage and integral with the molded plates shaped under seal support and the rolling body cage Digits with to be able to set a linear guide apparatus,
The rolling element cage and the under seal support are intermittently connected ,
A plurality of notches are provided at the side end of the under seal opposite to the side adjacent to the guide rail, and the under seal cannot be moved in the longitudinal direction of the guide rail by fitting with the notch. A linear motion guide device comprising a plurality of positioning portions for positioning in the rolling element holder .   The rolling element holder includes a first rolling element holding portion that holds a rolling element that rolls on a rail-side raceway groove formed on the left and right side upper portions of the guide rail on the slider side, and a lower left and right side surface of the guide rail. A second rolling element holding portion for holding a rolling element that rolls on the rail-side raceway groove formed on the slider side, and between the second rolling element holding portion and the first rolling element holding portion. A third rolling element holding portion provided, and a plate portion in contact with an end surface portion of the slider body at one end and the other end of the first to third rolling element holding portions. The linear motion guide device according to claim 1, wherein The linear motion guide device according to claim 1 , wherein the positioning portion is provided in the rolling element holder so as to intermittently connect the rolling element holder and the under seal support. . The positioning portion is formed integrally with the rolling element holder and is provided so as to partially connect the rolling element holder and the under seal support, and is provided at least at both longitudinal ends of the rolling element holder. linear guide apparatus according to claim 3, characterized by being. The linear motion guide according to any one of claims 1 to 4, wherein the under seal has a lip portion slidably in contact with the guide rail, and the lip portion is integrally connected in a longitudinal direction. apparatus. The linear motion guide device according to any one of claims 1 to 5 , wherein the under seal is formed of a material having flexibility and wear resistance . In the linear guide apparatus of any one of claims 1 to 6, linear guide device you further comprising a chamfered portion in a portion where the under-seal support is in contact with the under seal. The linear motion guide device according to claim 1, wherein the under seal has a chamfered portion at a portion in contact with the positioning portion . 9. The linear motion guide device according to claim 1, wherein the positioning portion has a chamfered portion at a portion in contact with the under seal .

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