Linear motion guide unit having inner surface seal

The present invention relates to, for example, a machine tool, particularly a cutting machine operated in a harsh working environment in which a large amount of foreign matter such as dust, chips and chips is generated, and liquid such as a working liquid and a coolant is scattered. The present invention relates to a linear motion guide unit equipped with an inner surface seal that is used by being incorporated in a machine tool such as a grinding machine or a woodworking machine and has an inner surface seal that prevents foreign matter from entering the track path from the inside of a slider that slides relative to the track rail.

In recent years, as a linear motion guide unit, it is used in a harsh usage environment where a large amount of foreign matter such as dust, chips, cut shoulders, and cutting fluid is generated due to the expansion of the processing area and installation area of the mechanical device in which it is incorporated. Even if it is done, there is a demand for something that can be used for a long period of time. In order to enable the linear motion guide unit to be used in a harsh usage environment, it is necessary to prevent foreign matter from entering the slider, but even if foreign matter enters the slider, at least the rolling elements will roll. It is most required to prevent foreign matter from entering the circulation path including the track path. Moreover, recently, in the linear motion guide unit, the track rail is a strict work from the viewpoint of preventing foreign matter from entering the circulation path as described above, making the device itself compact, and reducing the cost of the equipment. Despite being exposed to the environment and used, the specifications are such that conventional telescopic covers, bellows, and other dustproof devices are not installed.

Conventionally, a linear guide device provided with a ball cage with an inner seal is known. The ball cage with an inner seal is formed by coating a core metal having locking portions protruding in the axial direction at both ends in the longitudinal direction of a rectangle with rubber or synthetic resin, and from arcuate concave grooves on both side edges. A ball holding portion and an inner seal portion that contacts the upper surface of the guide rail and the inner surface of the slider facing the ball holding portion are formed, and the locking portion is fitted into the insertion recess of the end cap and mounted in the recess of the slider. .. Further, the ball is to be incorporated into the ball rolling groove after the cage is attached (see, for example, Patent Document 1).

In addition, as a linear rolling guide unit by the applicant, we have developed a linear rolling guide unit that can remove the top surface seal from the slider without removing the end cap from the casing, and applied for a patent earlier. The linear motion rolling guide unit is configured such that a top surface seal is arranged on the lower surface of the slider, and the top surface seal can be easily attached to and removed from the convex portion where the insertion hole of the end cap is formed, and the cross-sectional height is high. Is formed into a small one. The linear motion rolling guide unit has a lip seal whose upper surface seal is fixed to both side edges of the plate-shaped core metal, and both end surfaces of the lip seal come into contact with the side surface seal in the assembled state. When the screw of the side seal is loosened, the upper surface seal, which has been restrained from moving in the longitudinal direction by the side seal, is released from the restraint and can slide. If the top seal is slid, the tongue-shaped protrusion can be easily removed from the insertion hole. Therefore, in the linear motion rolling guide unit, the top surface seal can be easily removed from the slider by simply loosening the screw of the side surface seal without removing the end cap from the casing (see, for example, Patent Document 2).<patcit num="1"><text>Japanese Unexamined Patent Publication No. 7-301232</text></patcit><patcit num="2"><text>Japanese Patent No. 3307504</text></patcit>

<p> However, since the inner seal in the above linear guide device has a structure that also serves as a cage for holding the ball, the sealing function is not sufficient, and it is satisfactory for long-term use in the above-mentioned harsh usage environment. It was not possible, and it was not possible to meet the demand for a compact structure because it was constructed in a shape with a large cross-sectional height.</p><p> In addition, for the above-mentioned linear motion rolling guide unit, the positioning of the seal is achieved more accurately and surely, and the sliding contact of the seal lip of the inner surface seal provided on the slider with respect to the upper surface of the track rail is smoothed. It has become necessary to prevent foreign matter from entering the track path from the track rail in the slider through the casing and the end cap to further improve the sealing property.</p><p> An object of the present invention is to solve the above-mentioned problems, to solve the above-mentioned problems by following the technical idea of the linear motion rolling guide unit according to the above-mentioned applicant, and to be frequently used in machine tools. It is suitable for a linear motion guide unit in which the rolling elements are made of rollers, and in particular, a large amount of foreign matter such as dust, chips, and chips is generated, and liquids such as processing liquid and coolant are scattered. Even when used by incorporating it into a machine tool that operates in a harsh working environment, the inner surface seal provided on the slider reliably prevents foreign matter from entering the rolling circulation path of the rolling element, and the inner surface seal. Provides a linear motion guide unit with an inner seal that can smooth the sliding contact of one lip to the track rail, achieve close contact of another lip to the casing and end cap, and ensure further sealing performance. It is to be.</p>

<p> The present invention includes a track rail on which a first track surface is formed along the longitudinal direction of both side surfaces, and a slider that straddles the track rail and slides relative to each other via a plurality of rolling elements.<u style="single">Teori</u>The slider has a return path parallel to the track path formed on the first track surface of the track rail so as to face the first track surface and formed between the first track surface and the second track surface. The casing formed with the above, the end cap attached to both end faces of the casing and formed with a direction change path for communicating the track path and the return path, and the track path, the return path and a pair of the direction change paths. In a linear motion guide unit having the rolling element that rolls on a circulation path composed of roads, It has an inner surface seal disposed in a concave groove formed on the lower surface of the casing facing the upper surface of the track rail, and the inner surface seal is a flat plate extending along the lower surface of the casing and the end cap. The core metal is composed of a shape-shaped core metal and a sealing member fixed to the core metal, and the core metal is attached to the end cap by locking the locking tongue pieces provided at the center of both ends to the locking portions of the end cap. Be,<u style="single">The locking portion of the end cap is a locking hole for inserting and inserting the locking tongue piece of the inner surface seal to lock the end cap, and the locking hole is a relief formed on the lower surface of the end cap. The lower surface of the end cap is continuously formed in the concave groove, and the lower surface of the end cap is formed as a step on the upper surface side with respect to the lower surface of the casing, and the core metal of the inner surface seal is formed on the end cap. On the other hand, it can be tilted and inserted into the locking hole of the end cap.</u>The sealing member is formed on both sides of the core metal and a first lip that slides on both sides of the upper surface of the track rail to prevent foreign matter from entering the track path from the upper surface of the track rail. The second lip is provided with a second lip that abuts along the side surface of the concave groove of the casing to prevent foreign matter from entering the track path from the lower surface of the casing. The present invention relates to a linear motion guide unit that extends in a direction opposite to the extending direction of one lip and positions the first lip so as to smoothly slide on the upper surface of the track rail.</p><p> Further, in this linear motion guide unit, the first lip and the second lip extend in opposite directions on the same line, the first lip extends in the inner direction of the inner surface seal, and the second lip extends in the inner surface. It extends outward of the seal.</p><p> Further, the sealing member of the inner surface seal has a contact surface that can be brought into close contact with the bottom surface of the concave groove formed in the casing, and is fixed along both sides of the core metal, and the fixing portion is fixed. It is composed of a base portion that is integrated with the portion and integrally includes the first lip and the second lip.</p><p> Further, the sealing member of the inner surface seal is located at both ends of the core metal and is in close contact with the lower surface of the end cap to prevent foreign matter from entering the track path from the lower surface of the end cap. It has 3 lips.</p>

<p> This linear motion guide unit is configured as described above, and in particular, cutting that generates a large amount of foreign matter such as dust, chips, and chips, and scatters liquids such as machining fluid and coolant and foreign matter. When applied to machine tools such as machines, grinding machines, and woodworking machines, even if the foreign matter scatters and adheres to the track rail, the foreign matter will be removed by the lip or the like provided on the inner surface seal arranged on the lower surface of the slider. It is possible to completely prevent rolling objects such as rollers from entering the rolling circulation path, the slider can always slide smoothly on the track rail, and the inner surface seal can be attached to the slider. Can be easily performed, and the entire device can be constructed simply, compactly, and inexpensively.</p>

Hereinafter, an embodiment of the linear motion guide unit according to the present invention will be described with reference to the drawings. Even if this linear motion guide unit is used in various mechanical devices such as machine tools and industrial machines, the inner surface seal 7 mounted on the lower surface of the recess of the slider 2 ensures that foreign matter is prevented from entering the circulation path. Can be done. In this embodiment, a roller-type linear motion guide unit having a roller 5 as a suitable rolling element used in a machine tool is used.

As shown in FIGS. 1 and 2, this linear motion guide unit is a long track rail 1, in which a pair of track surfaces 11 (first track surfaces) are formed along the longitudinal direction of both side surfaces 56. It also has a slider 2 that is relatively slidable via a rolling element made of rollers 5 straddling the track rail 1. The slider 2 is generally parallel to the raceway 19 in which the raceway surface 12 (second raceway surface) is formed so as to face the raceway surface 11 of the raceway rail 1 and is formed between the raceway surface 11 and the raceway surface 12. The casing 3 on which the return path 10 is formed, the end cap 4 which is attached to both end faces 47 of the casing 3 and has the direction change path 45 which communicates the track path 19 and the return path 10, and faces the casing 3 in the longitudinal direction. A holding plate 13 for holding a roller 5 that extends and rolls on the track 19, and a plurality of rollers 5 that roll on a circulation path composed of a track 19, a return path 10, and a pair of direction change paths 45. Have. The return path 10 is formed by a sleeve 8 inserted through a fitting hole 9 formed in the casing 3. In this linear motion guide unit, the track rail 1 is formed with a mounting hole 17 for fixing the track rail 1 to the base or the like, and the casing 3 is provided with a counterbore hole 48 for mounting equipment such as other parts. A provided mounting screw hole 18 is formed.

This linear motion guide unit rolls between the track surface 11 and the track surface 12 while the roller 5 receives a large load on the track path 19, so that sliding defects, abnormal wear, damage, etc. do not occur. In order to prevent foreign matter from entering through the gap between the track rail 1 and the slider 2, it is indispensable to dispose a seal, and the track rail 1 and the slider 2 are placed on the outer end surface 46 of the end cap 4. An end seal 15 having a lip portion 16 for sealing the gap between the rail and the end seal 15 is arranged, and the lower surface seal 14 is arranged on the lower surfaces 33 and 34 of the casing 3 and the end cap 4 constituting the slider 2, and in particular, the lower surface seal 14 is arranged. Refer to FIGS. 3 to 12 to prevent foreign matter from entering the track 19 from the upper surface 57 of the track rail 1 located in the slider 2 in the slider 2 so that it can be used in a harsh working environment. It is characterized in that an inner surface seal 7 described later is provided. In this linear motion guide unit, an inner surface seal 7 is provided on the bottom of the recesses 54 and 55 between the casing 3 and the end cap 4 constituting the slider 2, that is, the lower surfaces 33 and 34 of the recesses 54 and 55. It is arranged. Further, as shown in FIG. 2, a pair of circulation paths are formed in the sleeves on both sides of the recess 54 of the casing 3 constituting the slider 2, and one of the rollers 5 is formed in the pair of circulation paths. , Circulates from the lower track 19 that receives the downward load of the slider 2 to the return path 10 above the casing 3, and the other roller 5 is from the upper track 19 that receives the upward load of the slider 2. It is configured to circulate in the return path 10 on the lower side of the casing 3. As shown in FIG. 6 or 13, the direction change paths 45 formed in the end cap 4 are formed so as to cross each other on the sleeves on both sides of the recess 55 of the end cap 4.

This linear motion guide unit is particularly characterized by having an inner surface seal 7 having a characteristic structure arranged in a concave groove 6 formed in a lower surface 33 of a casing 3 facing the upper surface 57 of the track rail 1. It is said. The inner surface seal 7 is composed of a flat plate-shaped core metal 21 extending along the lower surfaces 33 and 34 of the casing 3 and the end cap 4 and a sealing member 20 fixed to the core metal 21. The core metal 21 is attached to the end cap 4 by locking the locking tongue pieces 29 formed at the central portions of both ends to the locking portion 30 of the end cap 4. The sealing member 20 is provided with a contact surface 24 that is in close contact with the bottom surface 58 of the concave groove 6 formed in the casing 3, and is integrally with the fixing portion 23 and the fixing portion 23 that are fixed along both sides of the core metal 21. It is composed of a base 22 which is present and has a first lip 25, a second lip 26, and a third lip 27 integrally provided. Specifically, the base portion 22 constituting the seal member 20 is slidably contacted on both sides of the upper surface 57 of the track rail 1 to prevent foreign matter from entering the track path 19 from the upper surface 57 of the track rail 1. A second lip 26, which is formed on both sides of the core metal 21 and closely adheres along the side surface 50 of the concave groove 6 of the casing 3 to prevent foreign matter from entering the track 19 from the lower surface 33 of the casing 3. A third lip 27, which is formed on both end sides of the core metal 21 and is in close contact with the lower surface 34 of the end cap 4 to prevent foreign matter from entering the track 19 from the lower surface 34 of the end cap 4, is provided.

Further, in this linear motion guide unit, the second lip 26 extends in the direction opposite to the extending direction of the first lip 25 to increase the rigidity in the sliding contact direction of the first lip 25, and the first lip 25 is attached to the track rail 1. It is configured to perform the function of positioning so as to properly and smoothly slide on the upper surface 57 of the. Specifically, the first lip 25 and the second lip 26 extend in opposite directions on the same line, the first lip 25 extends inward of the inner surface seal 7, and the second lip 26 extends in the inner direction. It is formed so as to extend outward from the inner surface seal 7. Further, the fixing portion 23 constituting the seal member 20 positions the first lip 25 in a smooth sliding contact state with the upper surface 57 of the track rail 1, and the concave groove 6 in which the second lip 26 is formed in the casing 3. It is fixed to the core metal 21 so as to be positioned in close contact with the side surface 50 of the.

Further, the locking portion 30 of the end cap 4 is formed with a locking hole 35 into which the locking tongue piece 29 of the inner surface seal 7 is inserted and inserted. The locking hole 35 is formed in a size including the relief recessed groove 39 in order to improve the position accuracy, that is, the locking hole 35 is engaged with the relief recessed groove 39 formed on the lower surface 34 of the end cap 4 in a continuous state without a step. It is formed on the stop 30. The lower surface 34 of the end cap 4 is formed as a step 53 on the upper surface side with respect to the lower surface 33 of the casing 3. Further, the inner surface seal 7 is attached to the end caps 4 fixed to both end faces 47 of the casing 3, and one locking tongue piece 29 of the core metal 21 in the inner surface seal 7 is attached to the lower surface 34 of the end cap 4. Can be tilted and inserted into the locking hole 35 of the locking portion 30 of one end cap 4, and then the other locking tongue piece 29 inserts one locking tongue piece 29 into the locking hole 35. After that, it can be inserted into the locking hole 35 of the locking portion 30 of the other end cap 4. The inner surface seal 7 is positioned and fixed by a pair of end seals 15 arranged on the end surface 46 of the end cap 4 in contact with the end surface 60 of the core metal 21 extending to both end portions 31 at both ends of the inner surface seal 7. Is.

As shown in FIGS. 3 and 4, the inner surface seal 7 is a bottom portion that becomes a recess 54, 55 between both sleeves of the casing 3 of the slider 2 and the end cap 4, in other words, the lower surface 33 of the recess 54 of the casing 3. , And are arranged so as to extend over the lower surface 34 of the recess 55 of the end cap 4 arranged at both ends of the casing 3. The inner surface seal 7 mainly passes through the lip portion 16 of the end seal 15 on the end surface of the slider 2 and invades the upper surface 57 of the track rail 1 in the slider 2. It has a function to prevent invasion of. Foreign matter adhering to the upper surface 57 of the track rail 1 in particular enters the space between the numerous mounting holes 17 located in the center of the track rail 1 and the mounting bolts inserted through them, and enters the slider 2 from there. Therefore, in order to prevent the invading foreign matter from entering the track path 19, the inner surface seal 7 has the upper surface 57 of the track rail 1 on both sides along the longitudinal direction with the central position of the track rail 1 in between. The first lip 25 that slides in contact with the surface is provided. The first lip 25 is formed at the tip portion that extends from both sides of the bottom surface of the recess of the slider 2 toward the center of the track rail 1 and is in sliding contact with the upper surface 57 of the track rail 1 when viewed in a cross section orthogonal to the longitudinal direction. However, because it is formed so as to be inclined toward the center, that is, inward, it is difficult for foreign matter to enter the track 19 even if the tip is the track rail 1 and a slight squeeze.

The inner surface seal 7 is attached to the end cap 4 by inserting the locking tongue piece 29 formed at the center of both ends into the locking hole 35 formed in the locking portion 30 of the end cap 4. In this linear motion guide unit, parts such as members and devices to which a high load is applied are attached to the casing 3, and a mounting screw having a counterbore hole 48 for mounting the parts is provided in the center of the casing 3. The hole 18 is formed. As shown in FIG. 3 or 4, the inner surface seal 7 has a size so that the counterbore hole 48 of the casing 3 can be seen so that the mounting bolt can be inserted into the mounting screw hole 18 from the lower surface 33 of the recess 54 of the casing 3. An elliptical relief hole 28 is formed. That is, the relief hole 28 is formed larger than the mounting screw hole 18. The relief holes 28 formed in the core metal 21 of the inner surface seal 7 are formed at two locations on both ends of the central position facing the mounting screw hole 18 in the center of the casing 3. Further, in the core metal 21, a positioning hole 52 for positioning the core metal 21 when the fixing portion 23 of the seal member 20 is baked onto the core metal 21 is formed close to the central portion of the locking tongue piece 29. ing. Further, as shown in FIG. 5, the inner surface seal 7 is arranged in a concave groove 6 formed along the longitudinal direction on the lower surface 33 of the concave portion 54 of the casing 3. The concave groove 6 is formed in the casing 3 with the minimum space, so that the influence of the decrease in the rigidity of the casing 3 is reduced. The inner surface seal 7 arranged in the concave groove 6 is formed with a convex second lip 26 extending toward the side surface 50 along the side surface 50 inside the concave groove 6 of the casing 3. The second lip 26 is arranged on both sides of the core metal 21, and is formed so as to extend in the opposite direction of the first lip 25 when viewed in a cross section orthogonal to the longitudinal direction. The second lip 26 positions the inner surface seal 7 in the direction along the concave groove 6 of the casing 3, and the elasticity of the second lip 26 allows the first lip 25 to smoothly slide against the upper surface 57 of the track rail 1. Has the function of In particular, the second lip 26

Further, the inner surface seal 7 is provided with a fixing portion 23 constituting a sealing member 20 fixed to both sides of the core metal 21, and the fixing portion 23 is in close contact with the bottom surface 58 of the concave groove 6 of the casing 3. A facing surface 24 is formed to prevent foreign matter from entering the track 19. The fixing portion 23 is integrally formed with the base portion 22 for fixing the seal lips of the first lip 25, the second lip 26, and the third lip 27 to the core metal 21, and the concave groove 6 of the casing 3 is formed. The sliding contact state of the first lip 25 is smoothly positioned by contacting the bottom surface 58 of the above. Here, the smooth sliding contact of the first lip 25 with the upper surface 57 of the track rail 1 means that the tip of the lip is on the upper surface 57 of the track rail 1 with a slight squeeze so that the sliding resistance of the slider 2 does not increase. It is in a state of contact, and is in a state of sliding contact that can flexibly respond to changes in external conditions such as external force.

Figure<u style="single">11</u>And figure<u style="single">12</u>As shown in, the recess 55 of the end cap 4<u style="single">(Fig. 13)</u>The lower surface 34 of the casing 3 is formed in a step 53 state on the upper surface side with respect to the lower surface 33 of the concave groove 6 of the casing 3, that is, the bottom surface 58. That is, the locking hole 35 of the locking portion 30 of the end cap 4 can be inserted into the locking tongue piece 29 of the core metal 21 of the inner surface seal 7 at an angle so that the locking tongue piece 29 of the inner surface seal 7 can be inserted. The thickness of the core metal 21, that is, the thickness of the core metal 21, is larger than that of the core metal 21, and the lower surface 34 of the recess 55 of the end cap 4 is set to a step 53 of only δ in the upper surface direction from the lower surface 33 of the casing 3. In other words, the step 53 between the casing 3 and the end cap 4 in the slider 2 is a locking hole for the end cap 5 by inclining one locking tongue piece 29 of the inner surface seal 7 as shown in FIGS. 11 and 12. It is provided so that it can be inserted into the 35. In this linear motion guide unit, when the end cap 4 is fixed to the casing 3, the level of the locking hole 35 of the end cap 4 is the same, and the length BK between the locking holes 35 of the end cap 4 is the inner surface. Since the length between the end faces of the locking tongue pieces 29 provided at both ends of the core metal 21 constituting the seal 7 is shorter than the length Ls, the core metal 21 of the inner surface seal 7 is provided in the locking hole 35 of the end cap 5. If one of the locking tongue pieces 29 is tilted, it can be inserted and inserted. Therefore,<u style="single">As shown in Figures 6 and 7,</u>In order to seal the lower surface 34 of the recess 55 of the end cap 4 with respect to the gap 53 of the step 53 of the end cap 4 with respect to the casing 3, both ends of the inner surface seal 7 face the lower surface 34 of the end cap 4. A convex third lip 27 is formed. The third lip 27 has a function of preventing foreign matter from entering the track 19 from the lower surface 34 of the end cap 4.

As shown in FIGS. 8 to 10, the inner surface seal 7 is formed from a rectangular flat plate-shaped core metal 21 and a synthetic rubber sealing member 20 that is baked and fixed to both sides of the core metal 21 in the longitudinal direction. It is configured. The sealing member 20 is integrally formed with a fixing portion 23 which is provided with a close contact surface 24 of the bottom surface 58 of the concave groove 6 of the casing 3 and is baked over the entire length of the side portion of the core metal 21 and the fixing portion 23. It has a base portion 22, and the base portion 22 has a tongue-shaped first lip 25 and a first lip 25 in the opposite direction of the first lip 25 and the first lip 25 having a tongue-shaped cross section that extends inclined toward the center and smoothly slides on the upper surface 57 of the track rail 1. The second lip 26, which extends in a convex shape and is in close contact with the side surface 50 of the concave groove 6 of the casing 3, and the first lip 25 and the second lip 26 on the back surface, which is the other surface, adjacent to the facing surface 24. It is composed of a third lip 27 that extends vertically from the base 22 to both ends of the base 22 at the central portion of the base 22 and is in close contact with the lower surface 34 of the end cap 4. Further, the first lip 25 and the second lip 26 are formed over the entire length L1 of the inner surface seal 7. The facing surface 24 is formed over a range of length L2, which is the central part. The third lip 27 is formed in the range of length L3, which is both ends corresponding to the length of the end cap 4. Further, the length L2 of the contact surface 24 corresponds to the entire length portion of the casing 3, and the length L3 of the third lip 27 corresponds to the thickness of the end cap 4.

Further, in this linear motion guide unit, notches 32 are formed on both sides of the core metal 21 of the inner surface seal 7, and a locking tongue piece 29 is formed in the central portion between the notches 32. Also, a side end 31 is formed on the outside of the locking tongue piece 29 and the notch 32. That is, at both ends of the core metal 21 of the inner surface seal 7, the locking tongue piece 29 located at the center of both ends of the core metal 21 and the core metal 21 separated from the locking tongue piece 29 by a notch. Both ends have side ends 31 that extend longer than the locking tongue piece 29, and the side ends 31 extend longer than the locking tongue piece 29 in the longitudinal direction. Further, the side end portion 31 of the core metal 21 is arranged so as to sandwich the locking portion 30 of the end cap 4. The inner surface seal 7 is in a state where the locking tongue piece 29 is inserted into the locking hole 35 formed in the locking portion 30 of the end cap 4, and the side end portion 31 sandwiches the locking portion 30 from both sides. It is attached to cap 4.

In this linear motion guide unit, the total length Ls of the locking tongue pieces 29 formed at both ends of the core metal 21 of the inner surface seal 7 is shorter than the total length L1 of the core metal 21 of the inner surface seal 7 ( Ls &lt;L1). The length of the locking tongue piece 29 is formed to be Lm, and is shorter than the length of the side end portions 31 on both sides of the core metal 21. That is, the length of the side end portion 31 is [(Ll-Ls) / 2] + Lm. Therefore, when the locking tongue piece 29 of the core metal 21 is arranged in the locking hole 35 of the end cap 4, the side end portions 31 on both sides of the core metal 21 sandwich the side surface of the locking portion 30 of the end cap 4. In this state, the core metal 21 is stably fixed to the end cap 4. Further, the insertion length Lm of the locking tongue piece 29 into the locking hole 35 in the mounted state in which the inner surface seal 7 is attached to the slider 2 is set to be shorter than the length of the side end portion 31. Further, as shown in FIGS. 13 to 15, a locking portion 30 is formed on the bottom surface (bottom surface 34) of the recess 55 of the end cap 4 in a central portion closer to the outer end surface 46 so as to be convex from the bottom surface. ..

As shown in FIGS. 11 and 12, the end caps 4 are fixed to both end faces 47 of the casing 3 and the roller 5 is incorporated, and the locking tongue piece 29 of the inner surface seal 7 is attached to the end cap 4. It shows the state of being incorporated into the locking hole 35 of the locking portion 30. The inner surface seal 7 is attached at the locking portion 30 of the one end cap 4 facing the one locking tongue piece 29 of the inner surface seal 7 with the inner surface seal 7 tilted with respect to the lower surface 34 of the end cap 4. It is inserted into the locking hole 35 and pushed in, then the other locking tongue piece 29 is returned to the inclined state of the inner surface seal 7 so as to pass through the locking portion 30 of the other end cap 4, and the inner surface seal 7 is placed on the lower surface of the casing 3. In contact with 33, the other locking tongue piece 29 is moved in the direction of inserting into the locking hole 35 in the locking portion 30 of the other end cap 4, and the end surface 60 of the core metal 21 of the inner surface seal 7 is moved. When the position coincides with the outer end surface 46 of the end cap 4, both ends of the inner surface seal 7 are engaged and the installation is completed. In this state, the three support convex portions 51 provided in the locking holes 35 of the end cap 4 stably support the locking tongue piece 29 of the core metal 21. After that, if the end seals 15 are arranged on the end faces 46 of both end caps 4, the assembly of the slider 2 is completed. Further, in this linear motion guide unit, the inner surface seals 7 are attached to the end caps 4 fixed to both end faces 47 of the casing 3 as described above, and the inner surface seals 7 are attached to both ends of the inner surface seals 7 by a pair of end seals 15. Since it is positioned and fixed in contact with the end face 60 of the core metal 21 extending to both side end portions 31, when the screw of one end seal 15 is loosened, the plate-shaped core metal 21 moves toward the loosened end seal 15. It can be slid so that the locking tongue piece 29 of the inner seal 7 can be removed from the locking hole 35 of the end cap 4 to which the other end seal 15 is attached and the inner seal 7 can be removed from the slider 2. Is set to.

The linear motion guide unit provided with the inner surface seal according to the present invention is applied to various mechanical devices such as machine tools such as cutting machines, grinding machines, woodworking machines, and industrial machines, and foreign substances such as dust, chips, and chips are applied. It is preferable to use it in a harsh working environment where a large amount of water is generated or liquids such as machining fluids and coolants are scattered, and the foreign matter invades the track path from the inside of the slider that slides on the track rail. Can be prevented.

<figref num="1">It is a perspective view which shows the linear motion guide unit by this invention in the state including the cross-sectional part.</figref><figref num="2">It is a cross-sectional view which shows the state which the linear motion guide unit of FIG.</figref><figref num="3">It is a bottom view which shows the part of the slider near the inner surface seal attached to the slider in the linear motion guide unit of FIG.</figref><figref num="4">It is sectional drawing which shows the DD cross section in the slider of FIG.</figref><figref num="5">It is a detailed view which shows the C part in the linear motion guide unit of FIG. 2 in an enlarged manner.</figref><figref num="6">It is explanatory drawing which shows the relationship between a track rail and an end cap by the EE arrow view in the slider of FIG.</figref><figref num="7">It is a detailed view which shows the end cap, the inner surface seal and the track rail in the F part of FIG. 6 enlarged.</figref><figref num="8">It is a top view which shows the inner surface seal in the linear motion guide unit of FIG.</figref><figref num="9">It is a side view which shows the inner surface seal of FIG.</figref><figref num="10">It is sectional drawing which shows the GG cross section in the inner surface seal of FIG.</figref><figref num="11">It is explanatory drawing which shows the process of attaching the inner surface seal to the end cap of FIG.</figref><figref num="12">It is sectional drawing which shows the mounting process in the B part of FIG. 11 enlarged.</figref><figref num="13">It is a rear view which shows the end cap in the linear motion guide unit of FIG.</figref><figref num="14">It is a side view which shows the end cap of FIG.</figref><figref num="15">It is a bottom view which shows the end cap of FIG.</figref>

1 Track rail 2 slider 3 casing 4 End cap 5 Roller (Roller) 6 concave groove ( 7 Inner surface seal 10 Return road 11 Orbital plane (1st orbital plane) 12 Orbital plane (2nd orbital plane) 15 End seal 19 Orbit 20 Seal member 21 Core metal 22 base 23 Sticking part 24 Face-to-face 25 1st lip 26 2nd lip 27 3rd lip 28 Relief hole 29 Locking tongue piece 30 Locking part 31 side end 32 Notch 33,34 Bottom surface 35 locking hole 39 Relief concave groove 45 Turnaround 46,47<u style="single">,60</u> End face 50<u style="single">,56</u> side 53 steps 57 top surface 58 bottom