Linear motion guide unit

Abstract

To provide a linear motion guide unit capable of securing a smooth sliding motion of a slider while maintaining high sealing performance.SOLUTION: A linear motion guide unit 10a comprises: a rail 11a having first raceway surfaces 16a, 16b, 16c, 16d; a slider 21a that is attached to the rail 11a in a relatively movable manner; and a plurality of rolling bodies. The slider 21a includes a casing 22a, an end cap 23a, and an end seal 27a. The end seal 27a includes a first lip part 51a that is exposed outwardly on one side in a longitudinal direction and contacts the rail 11a, and a second lip part 52a that is arranged inwardly with respect to the first lip part 51a and contacts the rail 11a. In the second lip part 52a, an interference in a first region 61a facing the first raceway surfaces 16a, 16b, 16c, 16d is larger than an interference in a second region 62a facing surfaces other than the first raceway surfaces 16a, 16b, 16c, 16d.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to a linear motion guide unit. [Background technology]

[0002] A linear guide device including a guide rail, a slider, and rolling elements is known (see, for example, Patent Document 1). The linear guide device disclosed in Patent Document 1 includes side seals that seal between the slider and the upper surface and both side surfaces of the guide rail. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-164118 Summary of the Invention [Problem to be solved by the invention]

[0004] A high level of sealing between the rail and the slider is preferable. It is also desirable to ensure smooth sliding of the slider while maintaining high sealing performance. The linear guide device disclosed in Patent Document 1 cannot adequately meet these demands.

[0005] Therefore, one of the objects is to provide a linear motion guide unit that can ensure smooth sliding motion of the slider while maintaining high sealing performance. [Means for solving the problem]

[0006] A linear guide unit according to the present disclosure includes a rail having a first raceway surface extending in the longitudinal direction, a slider attached to the rail so as to be movable relative to the rail and having a second raceway surface opposing the first raceway surface, and a plurality of rolling elements that roll on a raceway formed by the first and second raceway surfaces. The slider includes a casing having a first circulation path parallel to the raceway and including a second raceway surface, an end cap located on one longitudinal side of the casing and having a second circulation path connecting the raceway and the first circulation path, and an end seal located on one longitudinal side of the end cap that has a shape that follows the outer shape of the casing when viewed in the longitudinal direction and seals a gap between the slider and the rail. The casing includes a pair of casing sleeves located on both sides of the rail in the width direction, and a casing base portion connected to each of the pair of sleeves. The end seal includes a first lip portion that is exposed outward on one longitudinal side and contacts the rail, and a second lip portion that is located inward of the first lip portion and contacts the rail. In the second lip portion, the interference in a first region facing the first raceway surface is larger than the interference in a second region facing a surface other than the first raceway surface. [Effects of the Invention]

[0007] According to the linear motion guide unit, it is possible to ensure smooth sliding movement of the slider while maintaining high sealing performance. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic perspective view showing a linear motion guide unit according to a first embodiment of the present disclosure. [Figure 2] FIG. 2 is a schematic front view of the linear guide unit shown in FIG. 1, with some members omitted. [Figure 3] FIG. 3 is a schematic cross-sectional view taken along the line indicated by the arrow III-III in FIG. [Figure 4] FIG. 4 is a schematic cross-sectional view of the end seal when the end seal is cut at the center in the X direction along a plane parallel to the YZ plane. [Figure 5]FIG. 5 is a schematic front view of the end seal as seen in the longitudinal direction. [Figure 6] FIG. 6 is an enlarged cross-sectional view showing a part of the end seal at a position where the first region is arranged. [Figure 7] FIG. 7 is an enlarged cross-sectional view showing a part of the end seal at a position where the second region is disposed. [Figure 8] FIG. 8 is a schematic cross-sectional view showing a portion of a linear motion guide unit according to the second embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0009] [Outline of the embodiment] The linear motion guide unit of the present disclosure includes a rail having a first raceway surface extending in the longitudinal direction, a pair of sleeves disposed on both sides of the rail in the width direction, and a base portion connected to each of the pair of sleeves. The slider is attached to the rail so as to be movable relative to the rail and has a second raceway surface opposing the first raceway surface, and a plurality of rolling elements that roll on a raceway formed by the first and second raceway surfaces. The slider includes a casing having a first circulation path parallel to the raceway and including a second raceway surface, an end cap disposed on one longitudinal side of the casing and having a second circulation path connecting the raceway and the first circulation path, and an end seal shaped to follow the outer shape of the casing when viewed in the longitudinal direction, disposed on one longitudinal side of the end cap, and sealing a gap between the slider and the rail. The end seal includes a first lip portion exposed outward on one longitudinal side and in contact with the rail, and a second lip portion disposed inward of the first lip portion and in contact with the rail. In the second lip portion, the interference in a first region facing the first raceway surface is larger than the interference in a second region facing a surface other than the first raceway surface.

[0010] According to the linear guide unit of the present disclosure, a slider including a pair of sleeves and bails connected to each sleeve is attached to the rail so that the pair of sleeves straddles the rail. The end seal included in the slider seals the top surface and both side surfaces of the rail. The end seal includes a first lip and a second lip, improving sealing performance.

[0011] Here, the inventors discovered that in a linear guide unit including a slider and a rail having the above-mentioned configuration, the elastic end seal is pulled toward the upper surface of the rail by the elastic force of the rubber, causing the end seal to be displaced, resulting in a decrease in sealing performance. Then, they conducted extensive research into the interference provided in the end seal, and came up with the idea of ​​the present disclosure. According to the linear guide unit of the present disclosure, the interference in the first region is greater than the interference in the second region. big Therefore, the displacement of the end seal can be reduced. Therefore, with this linear motion guide unit, it is possible to ensure smooth sliding movement of the slider while maintaining high sealing performance.

[0012] The linear motion guide unit of the present disclosure includes a rail having a first raceway surface extending in the longitudinal direction, a pair of sleeves disposed on both sides of the rail in the width direction, and a base portion connected to each of the pair of sleeves. The slider is attached to the rail so as to be movable relative to the rail and has a second raceway surface opposing the first raceway surface, and a plurality of rolling elements that roll on a raceway formed by the first and second raceway surfaces. The slider includes a casing having a first circulation path parallel to the raceway and including a second raceway surface, an end cap disposed on one longitudinal side of the casing and having a second circulation path connecting the raceway and the first circulation path, and an end seal shaped to follow the outer shape of the casing when viewed in the longitudinal direction, disposed on one longitudinal side of the end cap, and sealing a gap between the slider and the rail. The end seal includes a first lip portion exposed outward on one longitudinal side and in contact with the rail, and a second lip portion disposed inward of the first lip portion and in contact with the rail. In the second lip portion, an interference is provided only in a first region facing the first raceway surface.

[0013] With this linear guide unit, the second lip portion has an interference only in the first region that faces the first raceway surface, which ensures smoother sliding movement of the slider while maintaining high sealing performance.

[0014] In the linear motion guide unit described above, the end seals may be made of nitrile rubber (NBR), fluororubber (FKM), or hydrogenated nitrile rubber (HNBR). By using nitrile rubber as the end seal material, the compression set, tensile strength, and abrasion resistance required of a sealing component can be relatively good. By using fluororubber as the end seal material, for example, when the linear motion guide unit is used in a special environment, it is possible to improve oil resistance, chemical resistance, weather resistance, ozone resistance, and other properties. By using hydrogenated nitrile rubber as the end seal material, it is possible to improve heat resistance, oil resistance, and weather resistance compared to when nitrile rubber is used.

[0015] In the linear guide unit, the interference in the first region and the interference in the first lip portion may be equal, thereby improving sealing performance.

[0016] [Specific example of embodiment] Next, an example of a specific embodiment of the linear guide unit of the present disclosure will be described with reference to the drawings. In the following drawings, the same or corresponding parts are designated by the same reference numerals, and description thereof will not be repeated.

[0017] (Embodiment 1) First, a first embodiment of the present disclosure will be described. FIG. 1 is a schematic perspective view showing a linear guide unit according to the first embodiment of the present disclosure. FIG. 2 is a schematic front view showing the linear guide unit shown in FIG. 1 with some components omitted. FIG. 3 is a schematic cross-sectional view taken along the line indicated by arrows III-III in FIG. 2. In FIG. 1 and the following figures, the X direction indicates the short side direction, which is the width direction of the linear guide unit, the Y direction indicates the longitudinal direction of the linear guide unit, and the Z direction indicates the thickness direction (height direction) of the linear guide unit. The X direction, Y direction, and Z direction are all orthogonal to each other. FIG. 2 is a view seen from the direction indicated by arrow Y. To facilitate understanding, some rollers, which will be described later, are omitted from FIGS. 2 and 3.

[0018] 1 to 3, linear guide unit 10a according to embodiment 1 of the present disclosure includes rail 11a, which is a track rail, slider 21a, and a plurality of rollers 20a, 20b, 20c, and 20d as rolling elements. Rail 11a is configured to extend straight in the Y direction, which is the longitudinal direction. By including a plurality of rollers 20a, 20b, 20c, and 20d as rolling elements, linear guide unit 10a according to embodiment 1 can achieve a larger load rating while maintaining a more compact size compared to, for example, a case in which the rolling elements are balls. In this embodiment, linear guide unit 10a is a so-called four-row linear guide unit.

[0019] First, the configuration of the rail 11a will be described. The rail 11a includes a rail upper end surface 12a and a rail lower end surface 12b spaced apart in the Z direction, a first rail side surface 13a and a second rail side surface 13b spaced apart in the X direction, and a rail front end surface 14a and a rail rear end surface 14b spaced apart in the Y direction. That is, the rail 11a includes the first rail side surface 13a and the second rail side surface 13b extending parallel to each other along the longitudinal direction. The rail 11a has a pair of first raceway grooves 15a, 15b extending parallel to each other along the longitudinal direction. The first raceway groove 15a is provided in the first rail side surface 13a. The first raceway groove 15b is provided in the second rail side surface 13b. A linear motion guide unit 10a including a rail 11a configured in this way can more reliably achieve miniaturization.

[0020] The first raceway groove 15a is composed of first raceway surfaces 16a and 16b and a sidewall surface 17a. The first raceway surface 16a is inclined with respect to the XY plane and is provided on the rail upper end surface 12a side. The first raceway surface 16b is inclined with respect to the XY plane and is provided on the rail lower end surface 12b side. The sidewall surface 17a is provided contiguous to each of the first raceway surfaces 16a and 16b. Like the first raceway groove 15a, the first raceway groove 15b is also composed of first raceway surfaces 16c and 16d and a sidewall surface 17b. The first raceway surface 16c is inclined with respect to the XY plane and is provided on the rail upper end surface 12a side. The first raceway surface 16d is inclined with respect to the XY plane and is provided on the rail lower end surface 12b side. The sidewall surface 17b is provided contiguous to each of the first raceway surfaces 16c and 16d. That is, the rail 11a includes first raceway surfaces 16a, 16b, 16c, and 16d extending in the longitudinal direction. A linear motion guide unit 10a including such a rail 11a is suitable for use in machine tools, assembly equipment, conveyance machines, and the like.

[0021] The rail 11a is provided with a plurality of through holes 18 that penetrate in the Z direction from the rail upper end surface 12a to the rail lower end surface 12b. The plurality of through holes 18 are provided at intervals in the Y direction. For example, when using the linear motion guide unit 10a, the through holes 18 are each effectively used when attaching the rail 11a to a predetermined location.

[0022] Next, the configuration of the slider 21a will be described. The slider 21a is attached to the rail 11a so as to be relatively movable. The slider 21a includes a pair of sleeves 28a, 28b arranged on both sides of the rail 11a in the width direction, and a base portion 29a connected to each of the pair of sleeves 28a, 28b. The pair of sleeves 28a, 28b are arranged with a gap in the X direction. The base portion 29a includes an area that faces the rail upper end surface 12a when the slider 21a is attached to the rail 11a. A boundary L1 between the pair of sleeves 28a, 28b and the base portion 29a is indicated by a dashed line extending in the X direction in FIG. 2. The slider 21a has a recess 24a recessed in the Z direction. The slider 21a is attached so that the rail 11a is fitted into this recess 24a. That is, the slider 21a is slidably mounted on the rail 11a. In this embodiment, the slider 21a is attached so as to straddle the rail 11a, and is configured to be movable in the Y direction.

[0023] The slider 21a includes a casing 22a, a pair of end caps 23a and 23b (specifically, a first end cap 23a and a second end cap 23b), a pair of end seals 27a and 27b (specifically, a first end seal 27a and a second end seal 27b), and retaining members 41a and 41b that retain the rollers 20a, 20b, 20c, and 20d in the casing 22a. The first end cap 23a is disposed on one longitudinal side of the casing 22a, specifically, on the side of the casing 22a that faces the rail front end surface 14a in the longitudinal direction. The second end cap 23b is disposed on the other longitudinal side of the casing 22a, specifically, on the side of the casing 22a that faces the rail rear end surface 14b in the longitudinal direction. That is, the slider 21a includes a pair of end caps 23a, 23b arranged on both longitudinal sides of the casing 22a. The first end cap 23a has a through-hole penetrating in the Y direction. Both the first end cap 23a and the second end cap 23b are so-called plate-shaped, with their thickness direction aligned along the longitudinal direction. The first end cap 23a is connected to the casing 22a by a plurality of bolts 26a, 26b, 26c, and 26d via the through-hole. The second end cap 23b is connected to the casing 22a by a plurality of bolts via the through-hole.

[0024] The holding member 41a includes a holding plate 42a and a holding band 43a. The holding plate 42a includes a second guide surface that contacts second end faces located on the other side of the rollers 20a and 20b to guide the rollers 20a and 20b. The holding plate 42a also includes a groove that is recessed to accommodate the holding band 43a. Like the holding member 41a, the holding member 41b also includes a holding plate 42b and a holding band 43b. The configuration of the holding plate 42b is also similar to that of the holding plate 42a. That is, the holding plate 42b includes a second guide surface that contacts second end faces located on the other side of the rollers 20c and 20d to guide the rollers 20c and 20d. The holding plate 42b also includes a groove that is recessed to accommodate the holding band 43b.

[0025] The end seal 27a is disposed on one longitudinal side of the first end cap 23a. The end seal 27b is disposed on the other longitudinal side of the second end cap 23b. The slider 21a further includes a lubricating member that applies lubricant. The end seal 27a and the lubricating member are attached to the casing 22a together with the first end cap 23a by bolts 26a, 26b, 26c, and 26d. As with the end seal 27a, the end seal 27b and the lubricating member are attached to the casing 22a together with the second end cap 23b by multiple bolts. The configuration of the end seal 27a will be described in detail later. The casing 22a is provided with multiple through holes 25 that penetrate in the Z direction and each have a thread groove formed on its inner circumferential surface. In this embodiment, six through holes 25 are provided. The six through holes 25 are provided at intervals in the X direction and the Y direction, and are used, for example, when connecting the slider 21a to another member.

[0026] Casing 22a includes second raceway surfaces 32a, 32b, 32c, and 32d that face first raceway surfaces 16a, 16b, 16c, and 16d, respectively. Raceway 31a, on which roller 20a rolls, is composed of first raceway surface 16a and second raceway surface 32a. Raceway 31b, on which roller 20b rolls, is composed of first raceway surface 16b and second raceway surface 32b. Raceway 31c, on which roller 20c rolls, is composed of first raceway surface 16c and second raceway surface 32d. Raceway 31d, on which roller 20d rolls, is composed of first raceway surface 16d and second raceway surface 32d.

[0027] The casing 22a is provided with first circulation paths 33a, 33b, 33c, and 33d that run parallel to the raceways 31a, 31b, 31c, and 31d, respectively. The first circulation paths 33a, 33b, 33c, and 33d are also referred to as return paths. A hollow cylindrical sleeve 34a formed by combining a first divided member 35a and a second divided member 36a is disposed within the first circulation path 33a. A plurality of rollers 20a move within the sleeve 34a. Similarly, a hollow cylindrical sleeve 34b formed by combining a first divided member 35b and a second divided member 36b is disposed within the first circulation path 33b. A hollow cylindrical sleeve 34c formed by combining a first divided member 35c and a second divided member 36c is disposed within the first circulation path 33c. A hollow cylindrical sleeve 34d formed by combining a first divided member 35d and a second divided member 36d is disposed within the first circulation path 33d. The casing 22a includes a first guide surface that comes into contact with a first end surface located on one side of the rollers 20a, 20b, 20c, and 20d to guide the rollers 20a, 20b, 20c, and 20d.

[0028] The first end cap 23a is provided with a second circulation path 37a (see FIG. 3 in particular). The second end cap 23b is provided with a second circulation path 38a. The second circulation paths 37a, 38a are also referred to as direction change paths. The second circulation paths 37a, 38a each connect the raceway 31a and the first circulation path 33a. The rollers 20a circulate along a circular path formed by the raceway 31a, the second circulation path 37a, the first circulation path 33a, and the second circulation path 38a. The rollers 20b circulate along a circular path formed by the raceway 31b, the second circulation path of the first end cap 23a, the first circulation path 33b, and the second circulation path of the second end cap 23b. The rollers 20c circulate in a circular path formed by the raceway 31c, the second circulation path of the first end cap 23a, the first circulation path 33c, and the second circulation path of the second end cap 23b. The rollers 20d circulate in a circular path formed by the raceway 31d, the second circulation path of the first end cap 23a, the first circulation path 33d, and the second circulation path of the second end cap 23b.

[0029] The configuration of end seal 27a (first end seal) will now be described in detail. Figure 4 is a schematic cross-sectional view of end seal 27a when cut at the center in the X direction on a plane parallel to the YZ plane. Note that the configuration of end seal 27b (second end seal) is similar to that of end seal 27a, and therefore its description will be omitted.

[0030] The end seal 27a is made of rubber. The material of the end seal 27a is nitrile rubber (NBR), fluororubber (FKM), or hydrogenated nitrile rubber (HNBR). By using nitrile rubber as the material of the end seal 27a, it is possible to achieve relatively good compression set, tensile strength, and abrasion resistance, which are required of a sealing component. By using fluororubber as the material of the end seal 27a, it is possible to achieve good oil resistance, chemical resistance, weather resistance, ozone resistance, etc., when the linear motion guide unit 10a is used in a special environment, for example. By using hydrogenated nitrile rubber as the material of the end seal 27a, it is possible to achieve good heat resistance, oil resistance, and weather resistance compared to when nitrile rubber is used. In this embodiment, the material of the end seal 27a is nitrile rubber.

[0031] The end seal 27a includes a first lip portion 51a, a second lip portion 52a, and a plate-shaped portion 53a. The plate-shaped portion 53a is flat with its thickness in the Y direction and is disposed parallel to the XZ plane. A through-hole 54a is provided in the plate-shaped portion 53a, penetrating it in the thickness direction. The plate-shaped portion 53a also has a recess 55a recessed in the thickness direction, within which a lubricating member 56a is disposed.

[0032] The first lip portion 51a protrudes to one side in the thickness direction of the plate-shaped portion 53a and also protrudes toward the rail 11a. When the end seal 27a is attached, the first lip portion 51a elastically deforms and contacts the rail upper end surface 12a, a portion of the first rail side surface 13a, and a portion of the second rail side surface 13b at the nip portion 57a. When the end seal 27a is attached, the first lip portion 51a is exposed outward.

[0033] The second lip portion 52a protrudes from the other thickness direction of the plate-shaped portion 53a and also protrudes toward the rail 11a. The second lip portion 52a is spaced apart from the first lip portion 51a in the Y direction. When the end seal 27a is attached, the second lip portion 52a elastically deforms with the rail upper end surface 12a, a portion of the first rail side surface 13a, and a portion of the second rail side surface 13b, and contacts the nip portion 58a. When the end seal 27a is attached, the second lip portion 52a is not exposed to the outside and is not visible from the outside. When the end seal 27a is attached, a space 59a is formed between the first lip portion 51a and the second lip portion 52a in the Y direction. The end seal 27a configured in this manner employs a so-called double lip structure, which can improve sealing performance.

[0034] Here, in the second lip portion 52a, the interference in the first region 61a facing the first raceway surfaces 16a, 16b, 16c, and 16d is larger than the interference in the second region 62a facing surfaces other than the first raceway surfaces 16a, 16b, 16c, and 16d. FIG. 5 is a schematic front view of the end seal 27a viewed in the longitudinal direction. Referring to FIG. 5, the region where the first region 61a is located is indicated by a dashed line, and the region where the second region 62a is located is indicated by a dashed double-dashed line. Specifically, the surfaces other than the first raceway surfaces 16a, 16b, 16c, and 16d include the side wall surfaces 17a and 17b of the rail 11a and the rail upper end surface 12a. Furthermore, the surfaces other than the first raceway surfaces 16a, 16b, 16c, and 16d include surfaces from the rail upper end surface 12a to the first raceway surfaces 16a and 16c, surfaces from the first raceway surfaces 16a and 16c to the sidewall surfaces 17a and 17b, surfaces from the sidewall surfaces 17a and 17b to the first raceway surfaces 16b and 16d, surfaces from the first raceway surfaces 16b and 16d to the lower end surface of the slider 21a on the first rail side surface 13a, and surfaces from the first raceway surfaces 16b and 16d to the lower end surface of the slider 21a on the second rail side surface 13b. In this embodiment, the interference in the first region 61a and the interference in the first lip portion 51a are equal.

[0035] FIG. 6 is an enlarged cross-sectional view showing a portion of the end seal 27a at the position where the first region 61a is disposed. For ease of understanding, the rail 11a is indicated by a dashed line in FIG. 6 and in the following FIGS. 7 and 8. Referring to FIG. 6, when the end seal 27a is not attached, the interference of the first lip portion 51a, i.e., the length from the surface 19a of the rail 11a to the tip 63a of the first lip portion 51a when the end seal 27a is attached, is indicated by length D1. This surface 19a of the rail 11a corresponds to, for example, the first raceway surface 16b. The interference of the second lip portion 52a, i.e., the length from the surface 19a of the rail 11a to the tip 64a of the second lip portion 52a, is indicated by length D2. In this embodiment, length D1 = length D2.

[0036] FIG. 7 is an enlarged cross-sectional view showing a portion of the end seal 27a at the position where the second region 62a is disposed. Referring to FIG. 7, when the end seal 27a is not attached, the interference of the second lip portion 52a, i.e., the length from the surface 19a of the rail 11a to the tip 65a of the second lip portion 52a when the end seal 27a is attached, is indicated by length D3. The surface 19a of the rail 11a corresponds to, for example, the rail upper end surface 12a. The interference of the first lip portion 51a, i.e., the length from the surface 19a of the rail 11a to the tip 65a of the first lip portion 51a, is indicated by length D1. In this embodiment, length D1 is greater than length D3.

[0037] According to the linear guide unit 10a, the interference in the first region 61a is larger than the interference in the second region 62a. big Therefore, the displacement of the end seal 27a can be reduced. Therefore, such a linear motion guide unit 10a can ensure smooth sliding movement of the slider 21a while maintaining high sealing performance.

[0038] As a result of a simulation using the finite element method, the displacement of the end seal 27a in the linear guide unit 10a of the present disclosure was less than one-fourth of that in the case where interference was provided in all areas that contacted the rail 11a.

[0039] In this embodiment, the interference in the first region 61a and the interference in the first lip portion 51a are equal, thereby improving the sealing performance.

[0040] (Embodiment 2) Next, another embodiment, embodiment 2, will be described. FIG. 8 is a schematic cross-sectional view showing a portion of a linear guide unit according to embodiment 2 of the present disclosure. Referring to FIG. 8, end seal 27c included in linear guide unit 200 according to embodiment 2 includes a first lip portion 51a that is exposed outward on one longitudinal side and contacts rail 11a, and a second lip portion 52a that is disposed inward of first lip portion 51a and contacts rail 11a. In this embodiment, interference is provided only in first region 61a of second lip portion 52a that faces first raceway surfaces 16a, 16b, 16c, and 16d. In other words, interference is not provided in second region 62a that faces surfaces other than first raceway surfaces 16a, 16b, 16c, and 16d. More specifically, when end seal 27c is attached, length D3 from surface 19a of rail 11a to tip end 66a of second lip portion 52a is 0.

[0041] (Other embodiments) In the above embodiment, the rolling elements are rollers, but the invention is not limited to this and the rolling elements may be balls.

[0042] The present invention is intended to cover a wide range of applications, including those related to the present invention, including those related to the present invention. [Explanation of symbols]

[0043] 10a linear motion guide unit, 11a rail, 12a rail upper end surface, 12b rail lower end surface, 13a first rail side surface, 13b second rail side surface, 14a rail front end surface, 14b rail rear end surface, 15a, 15b first raceway groove, 16a, 16b, 16c, 16d first raceway surface, 17a, 17b side wall surface, 18, 25, 54a through hole, 19a surface, 20a, 20b, 20c, 20d roller, 21a slider, 22a casing, 23a end cap (first end cap), 23b end cap (second end cap), 24a recess, 26a, 26b, 26c, 26d bolt, 27a end seal (first end seal), 27b End seal (second end seal), 28a, 28b sleeve portion, 29a base portion, 31a, 31b, 31c, 31d raceway, 32a, 32b, 32c, 32d raceway, 33a, 33b, 33c, 33d first circulation path, 34a, 34b, 34c, 34d sleeve, 35a, 35b, 35c, 35d first divided member, 36a, 36b, 36c, 36d second divided member, 37a, 38a second circulation path, 41a, 41b retaining member, 42a, 42b retaining plate, 43a, 43b retaining band, 51a first lip portion, 52a second lip portion, 53a plate-shaped portion, 55a recess, 56a lubricating member, 57a, 58a nip portion, 59a Space, 61a 1st region, 62a 2nd region, 63a, 64a, 65a, 66a tip.

Claims

1. A rail having a pair of first track surfaces provided on both widthwise sides and extending longitudinally, a slider including a pair of sleeve portions disposed on both sides of the rail in a width direction, and a base portion connected to each of the pair of sleeve portions, the slider being attached to the rail so as to be relatively movable, and having a pair of second raceway surfaces facing the pair of first raceway surfaces, respectively; a plurality of rolling elements that roll on a raceway defined by the first raceway surface and the second raceway surface, The slider includes: a casing having a first circulation path parallel to the raceway and including the second raceway surface; an end cap disposed on one side of the casing in a longitudinal direction, the end cap having a second circulation path connecting the raceway and the first circulation path; an end seal that has a shape that follows the outer shape of the casing when viewed in the longitudinal direction, is disposed on one side of the end cap in the longitudinal direction, and seals a gap between the slider and the rail; The end seal is a first lip portion that is exposed outward on one side in the longitudinal direction and that comes into contact with the rail; a second lip portion disposed inward of the first lip portion and in contact with the rail, In the second lip portion, an interference in a first region facing the first raceway surface is larger than an interference in a second region facing a surface other than the first raceway surface.

2. A rail having a pair of first track surfaces provided on both widthwise sides and each extending in the longitudinal direction; a slider including a pair of sleeve portions disposed on both sides of the rail in a width direction, and a base portion connected to each of the pair of sleeve portions, the slider being attached to the rail so as to be relatively movable, and having a pair of second raceway surfaces facing the pair of first raceway surfaces, respectively; a plurality of rolling elements that roll on a raceway defined by the first raceway surface and the second raceway surface, The slider includes: a casing having a first circulation path parallel to the raceway and including the second raceway surface; an end cap disposed on one side of the casing in a longitudinal direction, the end cap having a second circulation path connecting the raceway and the first circulation path; an end seal that has a shape that follows the outer shape of the casing when viewed in the longitudinal direction, is disposed on one side of the end cap in the longitudinal direction, and seals a gap between the slider and the rail; The end seal is a first lip portion that is exposed outward on one side in the longitudinal direction and that comes into contact with the rail; a second lip portion disposed inward of the first lip portion and in contact with the rail, a linear motion guide unit, wherein an interference is provided only in a first region of the second lip portion that faces the first raceway surface;

3. 3. The linear motion guide unit according to claim 1, wherein the end seals are made of a material selected from the group consisting of nitrile rubber, fluororubber, and hydrogenated nitrile rubber.

4. 4. The linear motion guide unit according to claim 1, wherein an interference in said first region and an interference in said first lip portion are equal to each other.

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