JP2013061079A - Linear guide device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a linear guide device in which a screw hole for an end cap-attaching screw between upper and lower two-row return passages disposed on a slider body can be set deep and the height of the slider body can be suppressed low.SOLUTION: In the linear guide device, hollow parts 35, 35 for positioning each of end caps 4 to the slider body 3 are disposed adjacently to through-holes 33a, 33b of the slider body 3, on the outside of the through-holes 33a, 33b on an extension line L formed by connecting the center C1 of rolling paths 51a, 51b and the center C2 of the through-holes 33a, 33b, and the diameter of the hollow parts 35, 35 is set substantially equal to the diameter of the through-hole 33a, 33b, or the maximum width of the hollow parts 35, 35 is set equal to or smaller than the diameter of the through-hole 33a, 33b.

Description

  The present invention relates to a linear motion guide device.

Generally, the linear motion guide device includes a guide rail that extends in the axial direction and a slider that is movably provided on the guide rail. Rolling element rolling grooves extending in the axial direction are formed on both outer side surfaces of the guide rail, and the rolling element rolling grooves facing the rolling element rolling grooves are formed on the inner side surfaces of both sleeves of the slider body of the slider. Is formed. A large number of rolling elements are rotatably inserted into the rolling path formed by facing the rolling grooves of the both rolling elements, and the slider moves axially on the guide rail through the rolling of the rolling elements. It is supposed to move.
As the slider moves, it is necessary to continuously circulate rolling elements interposed between the guide rail and the slider. Therefore, both sleeve portions of the slider body of the slider are provided with return passages for the rolling elements penetrating in the axial direction, and a pair of end caps are attached to both end portions of the slider body in the axial direction so that each end cap is connected to the return passage. A semicircular arc direction change path that communicates is formed, and the rolling path, the return path, and the direction change path constitute a circulation path of the rolling elements.

  By the way, it is extremely difficult to form return passages and direction change paths without errors in the slider body and end caps attached to both ends in the axial direction, and each end cap is manufactured by molding with metal or hard synthetic resin. In such a case, there is a problem of heat shrinkage, and it is almost impossible to finish with strict accuracy. For this reason, when attaching the end cap to the slider body, it is difficult to accurately position the return path on the slider body side and the direction changing path on the end cap side, which causes the circulation in the circulation path of the rolling elements. In some cases, the rolling element rolling may be disturbed.

In order to solve this problem, conventionally, for example, the technology of the linear sliding bearing described in Patent Document 1, the technology of the linear guide device described in Patent Document 2, and the four-row array described in Patent Document 3 Infinite linear motion guide unit technology is known.
In the linear motion sliding bearing described in Patent Document 1, as shown in FIG. 6, a fitting portion having a tapered surface 103 that expands outward at the opening edge of the return passage 102 of the slider body 101. 104, on the other hand, on the inner surface side of each end cap 105, a peripheral protrusion 107 having a substantially wedge-shaped cross section is formed on the periphery of the direction changing path 106 corresponding to the return passage 102 of the slider body 101. Each end cap 105 is aligned by fitting the portion 107 into each fitting portion 104.

  Further, in the linear guide device described in Patent Document 2, as shown in FIG. 7A, the intermediate plate 202 attached to the end cap 201 is provided with a receiving port 204 positioned concentrically with the direction changing path 203, On the other hand, on the slider main body (not shown) side, an enlarged portion is provided at the end of the through hole, and the receiving port 204 is fitted to the enlarged portion to position the end cap. In the linear guide device described in Patent Document 2, as shown in FIG. 7B, a return passage member 205 having a substantially crescent-shaped cross section is inserted into the through hole on the slider body side, and a part of the through hole is inserted. The return passage member 205 constitutes a return passage. By inserting the resin return path member 205 into the through hole, friction with the rolling elements in the return path can be reduced.

  Further, in the four-row infinite linear motion guide unit described in Patent Document 3, as shown in FIG. 8, a sleeve 303 is inserted into the through hole 302 of the slider main body 301, and the return passage 304 of the rolling element is inserted into the sleeve 302. Is provided. The sleeve 303 has a protruding portion 303a that protrudes from one end surface in the axial direction, and the contact surface 301a of the slider main body 301 with which an end cap (not shown) abuts is in the same plane. It is inserted into the through hole 302. As a result, an end cap positioning recess 303 b is formed between the through hole 302 and the protrusion 303 a of the slider 303. On the other hand, the end cap is formed with a convex portion (not shown) that fits into the concave portion 303b for positioning the end cap. By fitting the convex portion into the concave portion 303b for positioning the end cap, The end cap is positioned.

Japanese Examined Patent Publication No. 62-11215 Japanese Patent Laid-Open No. 2000-35040 Japanese Patent No. 2865854

However, these conventional techniques have the following problems.
In other words, in the case of the linear sliding bearing described in Patent Document 1, the fitting portion 104 provided on the end surface of the slider body 101 expands outward toward the opening edge of the return passage 102 of the slider body 101. Since the tapered surface 103 is provided, the diameter of the concave portion for positioning the end cap is larger than the diameter of the return passage 102 formed in the slider main body 101.
On the other hand, two rows of rolling element rolling grooves are formed in each of the outer side surfaces of the guide rail, and two rows of rolling element rolling elements facing the rolling element rolling grooves on the inner side surfaces of both sleeve portions of the slider body. A linear motion guide device has been developed in which a groove is formed and a total of four rows of rolling passages are provided. In this linear guide device, upper and lower two rows of return passages are formed on both sleeve portions of the slider body corresponding to a total of four rows of rolling passages, and two rows on one side of each of the pair of end caps, A total of four rows of direction change paths are formed. In this linear motion guide device, a screw hole for attaching the end cap to the slider body is generally provided between the two upper and lower return passages in the slider body. The reason is that if a screw hole is provided on the upper side of the upper return path or the lower side of the lower return path, the direction change path formed on the end cap cantilevered when the end cap is attached with a mounting screw. This is because not only the durability is lowered but also the end cap is lifted as the rolling elements circulate, and the noise may increase.

  Therefore, when the above-described linear sliding bearing technology of Patent Document 1 is applied to such a linear motion guide device having a total of four rows of rolling passages, the diameter of the concave portion for positioning the end cap becomes a slider. Since the diameter is larger than the diameter of the return passage 102 formed in the main body 101, the space between the screw holes provided between the upper and lower two return passages is narrowed. There is a problem that the bearing surface becomes small. When such an end cap with a small seating surface is tightened with a mounting screw, the end cap is deformed, resulting in hindering smooth circulation of the rolling elements. In order to avoid such a problem that the seating surface of the end cap around the screw hole becomes small, if the space between the upper and lower return passages is made large, the screw hole provided in the slider body is made shallow, or the slider body There is a problem that it becomes necessary to increase the height.

  In the case of the linear guide device described in Patent Document 2, the intermediate plate 202 attached to the end cap 201 is provided with a receiving port 204 positioned concentrically with the direction changing path 203, while the slider main body side is provided with the receiving port 204. The enlarged portion is provided at the end of the through hole, and the receiving port 204 is fitted to the enlarged portion to position the end cap. For this reason, since the diameter of the recess for positioning the end cap is larger than the diameter of the through hole formed in the slider body, a screw hole for attaching the end cap is arranged between the upper and lower through holes. Then, the same problem as the case of the linear motion sliding bearing described in Patent Document 1 remains.

  Further, in the case of the four-row infinite linear motion guide unit described in Patent Document 3, a sleeve 303 is inserted into the through hole 302 of the slider body 301, and a rolling element return passage 304 is provided inside the sleeve 302. Therefore, it is necessary to provide a through hole 302 having a diameter larger than the thickness of the sleeve 302 with respect to the return passage 304. For this reason, if the screw hole for attaching an end cap is arrange | positioned between an upper and lower through-hole, the problem similar to the case of the linear motion sliding bearing described in the said patent document 1 will remain.

  Accordingly, the present invention has been made to solve the above-described problems, and the object thereof is to deepen a screw hole for an end cap mounting screw between two upper and lower return passages provided in the slider body. A further object of the present invention is to provide a linear guide device that can keep the height of the slider body small.

  In order to solve the above-mentioned problems, a linear motion guide apparatus according to claim 1 of the present invention includes a guide rail extending in the axial direction, a slider provided on the guide rail so as to be movable in the axial direction, and a plurality of sliders. Rolling rails are formed on each of both side surfaces, and two upper and lower rolling element rolling grooves extending in the axial direction are provided, and the slider is provided on the guide rail so as to be movable in the axial direction. And two upper and lower rows of rolling element rolling grooves facing the upper and lower rows of rolling element rolling grooves are provided on the inner surface of each of the sleeve portions, and two upper and lower rows are provided inside each of the sleeve portions. And a pair of end caps attached to both ends of the slider body in the axial direction, each formed in the rolling element rolling groove formed in the guide rail and the slider body. A total of four rows of rolling element rolling grooves formed A pair of end caps having a direction change path for communicating the dynamic passage and the return passage, and an end cap attachment for attaching the end cap to the slider body between the two upper and lower rows of return passages of the slider body. A screw hole for a screw, and the plurality of rolling elements roll on a circulation path constituted by the rolling path, the return path, and the direction changing path, whereby the slider In the linear motion guide device that moves on the guide rail, the return passage includes at least a part of a through-hole penetrating in the axial direction in each of the sleeve portions of the slider body, and each of the end caps. A recess for positioning with respect to the slider main body is an extension connecting the center of the rolling passage and the center of the through hole adjacent to the through hole of the slider main body. Provided on the outside of the through hole, and the diameter of the recess is set to be approximately equal to the diameter of the through hole or the maximum width of the recess is set to be equal to or less than the diameter of the through hole, A rolling element return passage member having a substantially crescent-shaped cross section is fitted in the through hole, and when the pair of end caps are attached to both end portions in the axial direction of the slider main body, the positioning convex portion of the end cap is the slider. The end caps are fitted to the positioning recesses of the main body, the end caps are positioned with respect to the slider main body, and the curved central axis of the direction changing path is aligned with the central axis of the return path and the central axis of the rolling path It is characterized by doing.

  Moreover, the invention which concerns on Claim 2 among this invention is that the separator which has an arm part which protrudes from a rolling-element projection range is incorporated in the said circulation path | route in the linear motion guide apparatus of Claim 1. It is a feature.

  According to the linear motion guide device of the first aspect of the present invention, the recess for positioning each of the end caps with respect to the slider body is adjacent to the through hole of the slider body, and the center of the rolling passage. And the diameter of the recess is set to be approximately equal to the diameter of the through hole, or the maximum width of the recess is the through hole. Therefore, the recesses for positioning the end caps are not formed between the upper and lower two rows of return passages, and are provided between the upper and lower two rows of return passages. The size of the seating surface of the end cap around the screw hole can be secured without reducing the distance from the screw hole for the end cap mounting screw, and when the end cap is tightened with the mounting screw, the end cap It is possible to prevent the deformation. For this reason, in order to avoid the problem that the seating surface of the end cap around the screw hole becomes small, it is not necessary to make a large space between the upper and lower return passages. The end cap mounting screw hole can be deepened and the height of the slider body can be kept small.

Further, since the rolling element return passage member having a substantially crescent-shaped cross section is fitted in the through hole, if a rolling member return passage member having a low friction coefficient such as a resin is applied, the rolling element can be smoothly smoothed. It can be circulated.
Moreover, according to the invention which concerns on Claim 2 among this invention, in the linear guide apparatus of Claim 1, the separator which has an arm part which protrudes from a rolling-element projection range is integrated in the said circulation path. Therefore, it can prevent that an adjacent rolling element interferes.

1 shows a first embodiment of a linear guide device according to the present invention, and is a front view of a linear guide device in which half of an end cap is cut off. FIG. FIG. 2 is a rear view of a part of an end cap used in the linear guide device of FIG. 1. FIG. 3 is a partial cross-sectional view taken along line 3-3 in FIG. The 2nd Embodiment of the linear guideway concerning the present invention is shown, and is a front view of the linear guideway which cut off the half of the end cap. It is a reverse view of a part of end cap used for the linear guide apparatus of FIG. It is sectional drawing of the principal part of the linear sliding bearing of a prior art example. It is a figure for demonstrating the linear guide apparatus of a prior art example. It is a front view of the 4 row infinite linear motion guide unit of a prior art example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a first embodiment of a linear guide apparatus according to the present invention, and is a front view of a linear guide apparatus in which half of an end cap is cut away. FIG. 2 is a rear view of a part of an end cap used in the linear motion guide device of FIG. FIG. 3 is a partial cross-sectional view taken along line 3-3 in FIG.
1 includes a guide rail 1 extending in an axial direction (a direction orthogonal to the paper surface in FIG. 1), a slider 2 provided on the guide rail 1 so as to be movable in the axial direction, and a plurality of guide rails. Each of the rolling elements 5 (see FIG. 3).

Here, the guide rail 1 is formed in a substantially rectangular parallelepiped shape, and upper and lower two rows of rolling element rolling grooves 11a and 11b extending in the axial direction are formed on both side surfaces 1a and 1a. Therefore, a total of four rows of rolling element rolling grooves 11a, 11b are formed on both side surfaces 1a, 1a of the guide rail 1. Further, the guide rail 1 is formed with a bolt insertion hole 12 for attaching the guide rail 1 to a base (not shown) or the like when the linear motion guide device is used.
The slider 2 includes a slider body 3 provided on the guide rail 1 so as to be movable in the axial direction, and a pair of end caps 4 attached to both ends of the slider body 3 in the axial direction.

  As shown in FIG. 1, the slider body 3 has a U-shaped cross section and a trunk portion 31 extending across the guide rail 1 and a pair of sleeves provided at both ends of the trunk portion 31. Parts 32 and 32. Two upper and lower rolling element rolling grooves 31 a and 31 b facing the upper and lower two rolling element rolling grooves 11 a and 11 b provided on the guide rail 1 are formed on the inner surface of each of the sleeve portions 32 and 32. Has been. Accordingly, a total of four rows of rolling element rolling grooves 31 a and 31 b are formed on both sleeve portions 32 and 32 of the slider body 3. An upper row of rolling passages 51 a is formed by the upper row of rolling element rolling grooves 11 a provided on the guide rail 1 and the upper row of rolling element rolling grooves 31 a provided on the slider body 3. A lower row rolling passage 51 b is formed by the lower row rolling element rolling grooves 11 b provided in the guide rail 1 and the lower row rolling element rolling grooves 31 b provided in the slider body 3. A total of four rows of rolling passages 51a and 51b are formed in the linear motion guide device.

Further, as shown in FIG. 1, two upper and lower rows of return passage through holes 33a and 33b are formed in each of the sleeve portions 32 and 32 of the slider body 3. As shown in FIG. The upper and lower two rows of return passage through-holes 33a and 33b extend in parallel to the upper and lower two rows of rolling element rolling grooves 31a and 31b in the axial direction, and the sleeves 32 and 32 of the slider main body 3 It is formed so as to penetrate both axial ends. In the present embodiment, the return passage of the rolling elements is composed of all of the through holes 33a and 33b.
In FIG. 1, reference numeral 6 is an under seal, 7 is a side seal, 9 is an oil supply nipple mounting hole, and 36 is a bolt screw hole for fixing a driven body such as a table to the slider 2.

  Further, the abutting surface 3a of the slider body 3 with which the end cap 4 abuts is disposed between the upper and lower rows of return passage through-holes 33a and 33b and above the upper row of rolling element rolling grooves 31a. A screw hole 34 for the end cap attachment screw 8 for attaching the cap 4 to the slider body 3 is provided. When attaching the end cap 4 to the slider body 3, the linear guide device having four rows of rolling passages 51a and 51b can be used without providing the screw holes 34 between the through holes 33a and 33b for the two upper and lower rows of return passages. In some cases, screw holes 34 are provided only above the through holes 33a in the row. However, in this case, since the direction changing paths 44a and 44b, which will be described later, of the end cap 4 are pressed in a cantilevered state, not only the durability is lowered, but the end cap is circulated as the rolling elements 5 are circulated. As a result, a problem arises in that noise rises. Therefore, as long as space is allowed, it is preferable to provide the screw holes 34 for the end cap mounting screws 8 between the upper and lower rows of return passage through holes 33a and 33b. From this point of view, in the present embodiment, screw holes 34 are also provided between the upper and lower rows of return passage through holes 33a and 33b.

  Further, as shown in FIG. 1, two positioning recesses 35, 35 for positioning each end cap 4 with respect to the slider body 3 are provided on the contact surface 3 a of the slider body 3. These positioning recesses 35 and 35 are adjacent to the through holes 33a and 33b of the three slider bodies, and are on an extension line L connecting the center C1 of the rolling passages 51a and 51b and the center C2 of the through holes 33a and 33b. Are provided outside the through holes 33a and 33b. Each positioning recess 35 has a crescent shape when viewed from the front whose diameter is set substantially equal to the diameter of the through holes 33a and 33b. The maximum width W of each positioning recess 35 is formed along the extension line L, and is set equal to or less than the diameter of the through holes 33a and 33b. In the present embodiment, each positioning recess 35 has a crescent shape when viewed from the front, in which the diameter is set to be approximately the same as the diameter of the through holes 33a and 33b, but the present invention is not limited thereto. Instead, any shape is possible when viewed from the front, and the maximum width W of each positioning recess 35 may simply be set equal to or less than the diameter of the through holes 33a and 33b.

  Further, the depth d of each positioning recess 35 (see FIG. 3) is not particularly defined. However, when the end cap 4 is attached to the slider body 3, the positioning projection 45 of the end cap 4 described later is positioned in each positioning. Any depth may be used as long as the recess 35 is properly fitted and the end cap 4 is properly positioned with respect to the slider body 3.

  Thus, the positioning recesses 35 and 35 for positioning each of the end caps 4 with respect to the slider body 3 are adjacent to the through holes 33a and 33b of the slider body 3 and are formed in the rolling passages 51a and 51b. Provided outside the through holes 33a and 33b on the extension line L connecting the center C1 and the center C2 of the through holes 33a and 33b, and the diameters of the recesses 35 and 35 are set to be substantially equal to the diameters of the through holes 33a and 33b. Or the maximum width of the recesses 35, 35 is set to be smaller than the diameter of the through holes 33a, 33b, so that the positioning recesses 35, 35 for positioning each of the end caps 4 have two upper and lower rows of return passages. (Through-hole) It is not formed between 33a and 33b. For this reason, the seat of the end cap 4 around the screw hole 34 without narrowing the space between the upper and lower return passages (through holes) 33a, 33b and the screw hole 34 for the end cap mounting screw 8 provided therebetween. The size of the surface can be secured, and deformation of the end cap 4 can be prevented when the end cap 4 is tightened with the end cap mounting screw 8. Thereby, in order to avoid the problem that the seat surface of the end cap 4 around the screw hole 34 for the end cap mounting screw 8 becomes small, a large space is provided between the upper and lower return passages (through holes) 33a and 33b. Since there is no need, the screw body 34 for the end cap mounting screw 8 between the two upper and lower return passages (through holes) 33a, 33b provided in the slider body 3 can be deepened, and the height of the slider body 3 can be increased. It can be kept small.

  And each end cap 4 attached to the axial direction both ends of the slider main body 3 is an injection-molded product made of a synthetic resin, and as shown in FIG. And includes a horizontal portion 41 and a pair of sleeve portions 42 provided at both ends thereof. Each sleeve 42 is formed with two upper and lower half-cylindrical recesses 43a and 43b on the side of the contact surface 4a that contacts the slider body 3, and a groove that crosses both the cylindrical recesses 43a and 43b. 48 is formed. A semi-cylindrical return guide 47 a is fitted to the upper part of the concave groove 48, and a semi-cylindrical return guide 47 b is fitted to the lower part of the concave groove 48. The upper half-cylindrical recess 43a and the return guide 47a described above form a semi-doughnut-shaped upper row direction change path 44a, and the lower half-cylindrical recess 43b and the return guide 47b form a semi-doughnut-shaped upper portion. A row direction change path 44b is formed. When the end cap 4 is attached to the slider body 3, the two upper and lower rows of direction changing paths 44a and 44b communicate the rolling passages 51a and 51b with the return passages (through holes) 33a and 33b, respectively.

  Further, an insertion hole 46 for the end cap mounting screw 8 is formed between the upper and lower half-cylindrical recesses 43 a and 43 b of each sleeve portion 42 of the end cap 4. Further, as shown in FIG. 2, positioning protrusions 45, 45 that fit into positioning recesses 35, 35 provided on the slider body 3 are provided on the contact surface 4 a of each sleeve 42 of the end cap 4. ing. Therefore, each end cap 4 is provided with four positioning projections 45. These positioning convex portions 45 and 45 are provided on the outer sides of the semi-cylindrical concave portions 43a and 43b adjacent to the upper and lower two-stage semi-cylindrical concave portions 43a and 43b, respectively. Each positioning convex portion 45 has a shape complementary to the positioning concave portion 35 so as to be fitted into the positioning concave portion 35, and protrudes from the contact surface 4a as shown in FIG.

  When a pair of end caps 4 and 4 are attached to both ends of the slider body 3 in the axial direction, rolling elements 51a and 51b, return paths (through holes) 33a and 33b, and direction changing paths 44a and 44b A circulation path is formed. At this time, as shown in FIG. 3, the four positioning projections 45 of each end cap 4 are fitted into the positioning recesses 35 of the slider body 3, and each end cap 4 is positioned with respect to the slider body 3 in the direction. The curved central axes of the conversion paths 44a and 44b are aligned with the central axes of the return passages (through holes) 33a and 33b and the central axes of the rolling passages 51a and 51b. Therefore, when attaching the end cap 4 to the slider body 3, the return passages (through holes) 33a, 33b on the slider body 3 side and the direction changing paths 44a, 44b on the end cap 4 side can be accurately aligned.

  A plurality of rolling elements 5 are loaded in a circulation path formed by the rolling passages 51a and 51b, the return passages (through holes) 33a and 33b, and the direction changing passages 44a and 44b. 2 can move on the guide rail 1. During this movement, the curved central axes of the direction changing paths 44a and 44b are aligned with the central axes of the return passages (through holes) 33a and 33b and the central axes of the rolling passages 51a and 51b. There is no disturbance in the rolling of the rolling elements circulating in the circulation path.

Next, a second embodiment of the linear motion guide device according to the present invention will be described with reference to FIGS. FIG. 4 shows a second embodiment of the linear motion guide device according to the present invention, and is a front view of the linear motion guide device in which half of the end cap is cut away. FIG. 5 is a rear view of a part of an end cap used in the linear motion guide device of FIG.
The linear motion guide device shown in FIG. 4 has the same basic configuration as that of the linear motion guide device shown in FIG. 1, but is different in the configuration of the return passage of the rolling elements. 4 and 5, the same or corresponding parts as those of the linear motion guide device shown in FIGS. 1 and 2 are denoted by the same reference numerals, and the description thereof is omitted.

  In the linear motion guide device shown in FIG. 4, rolling element return path members 61, 61 having a substantially crescent-shaped cross section are fitted in return passage through holes 33 a, 33 b provided in the slider body 3, and the rolling element 5 The return passage is constituted by a part of the through holes 33a and 33b and the rolling element return passage members 61 and 61. In this configuration, the rolling element 5 can be smoothly circulated by applying the rolling element return passage members 61, 61 having a small friction coefficient such as resin. Further, by using the rolling element return passage members 61 and 61 having a substantially crescent-shaped cross section, the separator 62 described below can be incorporated, and moreover than the case where the sleeve 303 as shown in FIG. The diameters of the through holes 33a and 33b can be kept small.

Further, in this linear motion guide device, as shown in FIGS. 4 and 5, a separator 62 having an arm portion 62 a that protrudes beyond the projection range of the rolling element 5 is incorporated in the circulation path. Thereby, it can prevent that the adjacent rolling element 5 interferes.
As mentioned above, although embodiment of this invention has been described, this invention is not limited to this, A various change and improvement can be performed.
For example, the rolling element return passage members 61 and 61 shown in FIG. 4 and the separator 62 shown in FIGS. 4 and 5 are not necessarily used.

DESCRIPTION OF SYMBOLS 1 Guide rail 2 Slider 3 Slider main body 3a Contact surface 4 End cap 4a Contact surface 5 Rolling body 6 Under seal 7 Side seal 8 End cap mounting screw 9 Oil supply nipple 11a, 11b Rolling body rolling groove 12 Bolt insertion hole 31 Body Part 31a, 31b rolling element rolling groove 32 sleeve part 33a, 33b through hole for return passage 34 screw hole for end cap mounting screw 35 positioning recess 36 screw screw hole 41 horizontal part 42 sleeve part 43a, 43b semi-cylindrical Concave portion 44a, 44b Direction change path 45 Positioning convex portion 46 Insert hole 47a, 47b for end cap mounting screw Return guide 48 Concave groove 51a, 51b Rolling passage 61 Rolling body return passage member 62 Separator 62a Arm portion

Claims (2)

A guide rail extending in the axial direction; a slider provided on the guide rail so as to be movable in the axial direction; and a plurality of rolling elements.
The guide rails form two upper and lower rolling element rolling grooves extending in the axial direction on each of both side surfaces,
The slider is provided on the guide rail so as to be movable in the axial direction, and the upper and lower rows of rolling element rolling grooves facing the upper and lower rows of rolling element rolling grooves are provided on the inner surface of each sleeve portion. And a pair of end caps attached to both end portions in the axial direction of the slider body, each of which includes the guide body. A pair of direction change paths for communicating a total of four rows of rolling passages constituted by rolling body rolling grooves formed on the rail and rolling body rolling grooves formed on the slider body and the return passages. With end caps,
A screw hole for an end cap mounting screw for mounting the end cap to the slider body between the two upper and lower return passages of the slider body;
The plurality of rolling elements roll on a circulation path constituted by the rolling path, the return path, and the direction changing path, so that the slider moves on the guide rail. In the device
The return passage includes at least a part of a through hole penetrating in the axial direction in each of the sleeve portions of the slider body,
A recess for positioning each of the end caps with respect to the slider main body is adjacent to the through hole of the slider main body and extends through the extension line connecting the center of the rolling passage and the center of the through hole. Provided on the outside of the hole, the diameter of the recess is set substantially equal to the diameter of the through hole or the maximum width of the recess is set equal to or less than the diameter of the through hole,
The through hole is fitted with a rolling element return passage member having a substantially crescent-shaped cross section,
When the pair of end caps are attached to both ends of the slider body in the axial direction, the positioning caps of the end caps fit into the positioning recesses of the slider body, and each of the end caps is in contact with the slider body. The linear guide device is characterized in that the curved center axis of the direction changing path is aligned with the center axis of the return path and the center axis of the rolling path. 2. The linear motion guide device according to claim 1, wherein a separator having an arm portion protruding beyond a rolling element projection range is incorporated in the circulation path.

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