Linear motion guide

Abstract

The present invention relates to a linear motion guide comprising: a rod-shaped rail; and a block part that moves along the rail, wherein the block part comprises first and second block parts provided on respective sides of the rail in the width-direction, the first and second block parts each comprise a block body and a plurality of track rollers provided therein to move along the length-direction of the rail, and at least one of the first and second block parts comprises a coupling member that can rotate against the block body via bearings (240).

Description

Linear Motion Guide

[0001] The present invention relates to a linear motion guide, and more specifically, to a linear motion guide that operates smoothly.

[0002] A linear motion guide, which is a mechanism for the linear reciprocating motion of the same product or equipment, is installed in automation devices and the like. Such a linear motion guide consists of a rod-shaped frame having a predetermined length and a movable block provided on the frame to enable reciprocating motion along the frame.

[0003] As illustrated in FIG. 1, the linear motion guide (100) includes a rail (110) having a length in the form of a rod and a moving block (120) installed on the rail (110) so as to be reciprocated along the longitudinal direction of the rail (110). The rail (110) may be manufactured from a metal material with high tensile strength, such as bearing steel. A moving member to be moved is coupled to the upper part of the moving block (120) and used.

[0004] A plurality of rail holes (111) are formed in the rail (110) at spaced intervals along its length direction, bolts are inserted into the rail holes (111), and the rail (110) is installed on a frame (not shown). On both sides of the rail (110) in the width direction, track sections (114) are formed along the length direction, and a track roller (125) rolls along the track sections (114).

[0005] The above-described moving block (120) includes a block body (121) and a plurality of track rollers (125) located on both sides in the width direction of the rail (110). A plurality of main body holes are formed in the block body (121), and a roller bolt (123) having a rotatably track roller (125) is inserted into the main body hole, and a nut (127) is fastened on the other side to install the track roller (125). A plurality of track rollers (125) are provided located on each side in the width direction of the rail (110). As shown in FIG. 1, two track rollers (125) may be provided on each side in the width direction of the rail (110).

[0006] The conventional linear motion guide (100) described above had problems such as reduced rigidity due to twisting in the block if the installation error of the frame (110) was large, poor straightness that could occur during machining and assembly, and difficulty in smooth movement due to gaps or steps in the connection parts of the frames (110) when multiple frames (110) were installed.

[0007] The present invention is proposed to solve the problems of the conventional technology described above, and aims to provide a linear motion guide that enables smooth movement even when installation errors occur, by dividing the movable block and allowing at least one movable block to rotate.

[0008] For the above purpose, the present invention comprises a bar-shaped rail and a block portion that travels along the rail; the block portion comprises a first block portion and a second block portion provided on both sides in the width direction of the rail, and the first block portion and the second block portion comprise a block body and a plurality of track rollers provided on the block body and traveling along the length direction of the rail;

[0009] A linear motion guide is provided, characterized in that at least one of the first block part and the second block part includes a coupling member that is rotatably provided on the block body via a bearing (240).

[0010] In the above, one or more of the first block part and the second block part have a bearing insertion part having a jaw portion formed on the lower part of the block body; the bearing inserted into the bearing insertion part, a shaft member inserted into the bearing and protruding upward past the bearing, an installation member coupled to the block body by screwing so as to be positioned above the bearing inserted into the bearing insertion part, and a fastening nut screwed to the shaft member;

[0011] The above coupling member is provided on the upper part of the installation member with an axial member inserted therein; and the above coupling member is characterized by being rotatable with respect to the block body via a bearing.

[0012] In the above, it further includes a movable member coupled to the upper part of the block;

[0013] A bearing is installed in the block body of the second block part, and a coupling member is rotatably provided in the block body via the bearing;

[0014] The above-mentioned moving member is characterized by being coupled to the coupling member of the second block part and the block body of the first block part.

[0015] In the above, it further includes a movable member coupled to the upper part of the block;

[0016] A bearing is installed in the block body of the first block part and the second block part, and a coupling member is rotatably provided in the block body through the bearing;

[0017] The above-mentioned movable member is characterized by being coupled to the coupling member of the first block part and the second block part.

[0018] The linear motion guide according to the present invention can travel smoothly along the rail even if errors occur during the machining or assembly process.

[0019] FIG. 1 is a perspective view illustrating a linear motion guide according to the prior art, and

[0020] FIG. 2 is a perspective view illustrating a part of a linear motion guide according to the present invention, and

[0021] FIG. 3 is a cross-sectional view along line AA of FIG. 2, and

[0022] FIG. 4 is a partial perspective view of a linear motion guide according to the present invention showing a state in which a movable member is installed, and

[0023] FIG. 5 is a bottom perspective view of a movable member, and

[0024] FIG. 6 is a cross-sectional view along line AA of FIG. 4, and

[0025] FIG. 7 is a plan view illustrating the effect of a linear motion guide according to the present invention.

[0026] All technical and scientific terms used in the description of the present invention, unless otherwise defined, have the meaning generally understood by those skilled in the art to which the present disclosure pertains. All terms used in the present disclosure are selected for the purpose of further clarifying the present disclosure and are not selected to limit the scope of the rights under the present disclosure.

[0027] Expressions such as "comprising," "having," "having," etc. used in the description of the present invention should be understood as open-ended terms implying the possibility of including other embodiments, unless otherwise stated in the phrase or sentence containing such expressions.

[0028] Singular expressions used in the description of the present invention may include the meaning of the plural form unless otherwise stated, and this applies likewise to singular expressions described in the claims.

[0029] Expressions such as "first," "second," etc., used in the description of the present invention are used to distinguish multiple components from one another and do not limit the order or importance of said components.

[0030] Where in the description of the present invention it is mentioned that a component is "connected" or "combined" to another component, it should be understood that the component can be directly connected or combined to the other component, or can be connected or combined through a new or different component.

[0031] The linear motion guide of the present invention will be described in detail below with reference to the attached drawings.

[0032] FIG. 2 is a perspective view showing a part of a linear motion guide according to the present invention, FIG. 3 is a cross-sectional view along line AA of FIG. 2, FIG. 4 is a partial perspective view of a linear motion guide according to the present invention showing a state in which a moving member is installed, FIG. 5 is a bottom perspective view of a moving member, FIG. 6 is a cross-sectional view along line AA of FIG. 4, and FIG. 7 is a plan view for explaining the effect of a linear motion guide according to the present invention.

[0033]

[0034] For convenience of explanation in the following description, the x direction of Fig. 2 is described as the width direction, the y direction as the length direction, and the z direction as the up-and-down direction.

[0035]

[0036] As illustrated in FIGS. 2 and 4, a linear motion guide (200) according to the present invention comprises a rail (210), a block portion, a bearing (240), and a moving member (250).

[0037] The rail (210) is provided in the form of a rod extending in the longitudinal direction. A plurality of rail holes (211) are formed in the rail (210) spaced apart along the longitudinal direction, and bolts are inserted into the rail holes (211) and the rail (210) is installed on a frame (not shown). On both sides of the rail (210) in the width direction, concave track sections (214) extending along the longitudinal direction are formed. A track roller provided in the block section comes into contact with the track section (214) and performs rolling motion along the track section (214).

[0038] The above block section travels along the rail (210). The above block section comprises a first block section and a second block section provided on both sides in the width direction of the rail (210).

[0039] The above first block and second block are formed by including a block body and a track roller.

[0040] The above block body is provided in the form of a block. The block body of the first block part and the block body of the second block part are spaced apart in the width direction and are provided facing each other and parallel to each other. A plurality of track roller holes are formed in the block bodies of the first block part and the second block part, spaced apart in the length direction and penetrating in the vertical direction.

[0041] The above track roller is provided on the block body. The track roller is provided in multiple numbers, spaced apart along the longitudinal direction, on the block body of the first block section and the block body of the second block section, respectively. The rotation axis of the track roller is inserted into the track roller hole formed in the block body, and a male screw is formed on the upper end of the rotation axis of the track roller, and a nut is fastened to the male screw within the track roller hole of the block body, thereby connecting the track roller to the block body. The first block section and the second block section travel along the longitudinal direction of the rail (210) by means of the track roller.

[0042] One or more of the first and second block bodies are provided with a coupling member on their upper portions. In the block body provided with the coupling member, a bearing insertion portion having an upwardly extending projection is formed on the lower portion between track roller holes spaced apart in the longitudinal direction.

[0043] A bearing (240) is inserted and provided in the bearing insertion part above.

[0044] As shown in FIGS. 3 and 6, two bearings (240) may be installed, one above and one below, and a double row of bearings may be installed. FIGS. 3 and 6 show a state in which two angular contact bearings are installed. In FIGS. 3 and 6, hatching for the bearings has been omitted.

[0045] In the block body having a coupling member on the upper side of the first block part and the second block part, a shaft member is inserted into the bearing (240) provided in the bearing insertion part, an installation member is provided between the block body and the coupling member, and a fastening nut that is fastened to the shaft member is included.

[0046] The above-mentioned shaft member extends in the vertical direction and is provided in the form of a rod with a circular cross-section. A track roller is rotatably coupled to the lower part of the shaft member.

[0047] The above shaft member is inserted into a bearing (240) provided in the bearing insertion part of the block body equipped with the above coupling member. The above shaft member is inserted into the inner ring of the bearing (240) and is provided to protrude upward past the bearing (240). A male screw thread is formed on the upper part of the shaft member protruding past the bearing (240).

[0048] At the lower end of the shaft member, a shaft member jaw is formed that extends outward in a radial direction and rises, and the shaft member jaw engages with the inner ring of the bearing (240), and the inner ring of the bearing (240) is supported by the shaft member jaw.

[0049] The above-mentioned installation member is a hollow body having a through hole formed in the upper and lower directions on the inner side. The above-mentioned installation member is positioned above the bearing (240) inserted into the bearing insertion part.

[0050] The above-mentioned mounting member is rectangular or circular, and a circular through hole is formed on the inner side that penetrates in the vertical direction. The mounting member is provided with mounting portions that penetrate in the vertical direction and are spaced apart along the edges of the through hole. If the mounting member is rectangular, mounting portions are provided at the four corners. A bolt is inserted into the mounting portion, and the bolt is screwed into a screw groove (or screw hole) of the block body formed at the location where the mounting portion is formed, thereby fixing the mounting portion to the block body.

[0051] The above bearing (240) is inserted into the bearing insertion part from the top, and the outer ring of the bearing (240) is seated on the lower jaw of the bearing insertion part, and the outer ring of the bearing (240) inserted into the bearing insertion part is fixed by being pressed between the installation member and the lower jaw of the bearing insertion part.

[0052] The above-mentioned connecting member is provided on the upper part of the above-mentioned installation member. The above-mentioned connecting member is provided in the shape of a circular plate. The above-mentioned connecting member may be formed to be equal to the width of the block body, or larger or smaller than the width of the block body. A connecting member shaft hole and a plurality of connecting member holes are formed in the above-mentioned connecting member.

[0053] The above-mentioned coupling member shaft hole is formed to penetrate vertically through the center of the coupling member. The coupling member is provided at the upper part of the installation member, with a shaft member inserted into the coupling member shaft hole.

[0054] The above-mentioned coupling member holes are formed in multiple numbers, spaced radially from the coupling member shaft hole and spaced along the circumferential direction. The above-mentioned coupling member holes are formed to penetrate in the vertical direction. A female screw is formed in the above-mentioned coupling member holes. The above-mentioned coupling member holes may be formed as upwardly concave grooves.

[0055] The above coupling member may further be provided with a ring-shaped spacer that contacts the inner ring of the bearing (240) at the lower part of the coupling member. The spacer may be formed as a cylindrical projection integrally provided at the lower part of the coupling member.

[0056] A fastening nut is fastened to the threaded portion of the shaft member that protrudes upward through the installation member and the coupling member. As the coupling member presses the spacer downward due to the fastening of the shaft member and the fastening nut, the inner ring of the bearing (240) is pressed and fixed between the shaft member jaw and the spacer.

[0057] Accordingly, the coupling member is rotatably provided on the block body via the bearing (240), and relative operation is possible between the coupling member and the block body through the bearing (240).

[0058] In the block body among the first and second block parts where the bearing insertion part is not formed, a block coupling part is formed that is spaced apart in the longitudinal direction and penetrates in the vertical direction. The block coupling part may be formed as an upwardly concave groove. A female screw is formed in the block coupling part. The block coupling part is formed spaced apart in the longitudinal direction from the track roller hole.

[0059] The above-mentioned moving member (250) is provided by being coupled to the upper part of the block portion. A part or device to be moved is coupled to the moving member (250) and moves along the rail (210) together with the movement of the block portion.

[0060] When a coupling member is installed on the block body of the first block and the second block, the coupling member is rotatably provided on the block body, and the moving member (250) is coupled to the coupling member of the first block and the second block.

[0061] When a coupling member is installed on only one of the block bodies of the first block part and the second block part, the moving member (250) is coupled to the connecting member installed in the first block part or the second block part and to the block body of the remaining first block part or the second block part. For example, if a coupling member is installed only on the block body of the first block part, the moving member (250) is coupled to the connecting member installed in the first block part and to the block body of the second block part, and if a coupling member is installed only on the block body of the second block part, the moving member (250) is coupled to the connecting member installed in the second block part and to the block body of the first block part.

[0062] A plurality of movable member coupling holes are formed in the movable member (250) into which a bolt for coupling to the block portion is inserted. The movable member coupling holes include a plurality of first movable member coupling holes for coupling to the first block portion and a plurality of second movable member coupling holes for coupling to the second block portion.

[0063] The above-mentioned moving member (250) has a moving member installation part (251) in the shape of a concave groove formed at the bottom.

[0064] In the case where a coupling member is installed only on the block body of the first block part among the first block part and the second block part, a movable member installation part (251) is formed at the bottom of the movable member (250) where the block body of the first block part is located, and a plurality of first movable member coupling holes are formed at a distance in the circumferential direction in the movable member installation part (251). At the bottom of the movable member (250) where the block body of the second block part is located, a plurality of second movable member coupling holes are formed at a distance in the longitudinal direction and penetrate in the vertical direction from both sides in the longitudinal direction.

[0065] In the case where a coupling member is installed only on the block body of the second block part among the first block part and the second block part, a movable member installation part (251) is formed at the lower part of the movable member (250) where the block body of the second block part is located, and a plurality of second movable member coupling holes are formed at a distance in the circumferential direction in the movable member installation part (251). At the lower part of the movable member (250) where the block body of the first block part is located, a plurality of first movable member coupling holes are formed at a distance in the longitudinal direction and penetrate in the vertical direction from both sides in the longitudinal direction.

[0066] When a coupling member is provided on the block body of the first block part and the second block part, the movable member (250) has a movable member installation part (251) formed on both sides in the width direction, a first movable member coupling hole is formed in the movable member installation part (251) on one side in the width direction, and a second movable member coupling hole is formed in the movable member installation part (251) on the other side.

[0067] In the moving member installation part (251) of the moving member (250), a connecting member of a block body, which is equipped with a connecting member among the first block part and the second block part, is inserted into and seated in the moving member installation part (251).

[0068]

[0069] After the coupling member is inserted into the movable member installation part (251) of the above-mentioned movable member (250), a bolt is inserted into the movable member coupling hole and screw-fastened into the coupling member hole formed in the coupling member to connect the movable member (250) to the first block part and / or the second block part equipped with the coupling member. It is also possible to form a through hole, the movable member hole (253), on the inner side of the movable member installation part (251) so that the shaft member (234) and the fastening nut (238) are exposed.

[0070] In the case where a first block part or a second block part is provided without the above-mentioned coupling member, a bolt is inserted into the movable member coupling hole and screw-fastened to the block coupling parts formed on both sides in the longitudinal direction of the block body without the coupling member, thereby coupling the movable member (250) to the first block part or the second block part without the coupling member.

[0071] A linear motion guide (200) according to the present invention is provided with a coupling member that is rotatably provided on the block body via a bearing (240), and the block body becomes rotatable with respect to the movable member (250) by the coupling member being coupled to the movable member (250). That is, when the coupling member is fixedly coupled to the movable member (250), the block body becomes rotatable with respect to the movable member (250).

[0072]

[0073] For convenience of explanation in the following description, as shown in FIG. 2, the block body of the first block section (220) is described as the first block body (221) and the track roller as the first track roller (225), and the block body of the second block section (230) is described as the second block body (231) and the track roller as the second track roller (235). Additionally, the second block section (230) is described as having a coupling member (236) provided therein.

[0074] The first block section (220) is located on one side in the width direction of the rail (210), and the second block section (230) is located on the other side in the width direction of the rail (210).

[0075] The first block section (220) comprises a first block body (221), a first track roller (225), and a first fastening nut (223).

[0076] The first block body (221) is provided in the form of a block. A plurality of track roller holes are formed in the first block body (221), spaced apart in the longitudinal direction and penetrating in the vertical direction.

[0077] The first track roller (225) is provided on the first block body (221). The first track roller (225) is provided in the first block body (221) in a plurality of spaces spaced apart along the longitudinal direction. The rotation axis of the first track roller (225) is inserted into the track roller hole formed in the first block body (221), and a first roller bolt (227), which is a male screw, is formed on the upper end of the rotation axis of the first track roller (225). A first fastening nut (223) is fastened to the first roller bolt (227) within the track roller hole of the first block body (221), and the first track roller (225) is coupled to the first block body (221).

[0078] The above second block section (230) comprises a second block body (231), a second track roller (235), and a second fastening nut (233).

[0079] The second block body (231) is provided in the form of a block. The second block body (231) is spaced apart from the first block body (221) in the width direction and is provided facing each other in parallel. A plurality of track roller holes are formed in the second block body (231), spaced apart in the length direction and penetrating in the vertical direction.

[0080] The second track roller (235) is provided on the second block body (231). The second track roller (235) is provided in multiple numbers spaced apart along the longitudinal direction on the second block body (231). The rotation axis of the second track roller (235) is inserted into the track roller hole formed in the second block body (231), and a second roller bolt (237), which is a male screw, is formed on the upper end of the rotation axis of the second track roller (235). A second fastening nut (233) is fastened to the second roller bolt (237) within the track roller hole of the second block body (231), and the second track roller (235) is coupled to the second block body (231).

[0081] The above block section travels along the length direction of the rail (210) by means of the first track roller (225) of the first block section (220) and the second track roller (235) of the second block section (230).

[0082]

[0083] The above block section is described as having a connecting member (236) provided in the second block section (230) among the first block section (220) and the second block section (230). However, this is for convenience of explanation and does not limit the left or right side of the rail (210).

[0084] In the second block body (231) of the second block part (230) above, a bearing insertion part (2311) having an upwardly extending jaw portion at the bottom is formed between the second track rollers (235) spaced apart in the longitudinal direction.

[0085] A bearing (240) is inserted into the bearing insertion part (2311).

[0086] As shown in FIGS. 3 and 6, two bearings (240) may be installed, one above and one below, and a double row of bearings may be installed. FIGS. 3 and 6 show a state in which two angular contact bearings are installed. In FIGS. 3 and 6, hatching for the bearings has been omitted.

[0087] In the second block body (231) of the second block part (230), a shaft member (234) is inserted into the bearing (240) provided in the bearing insertion part (2311), an installation member (232) is provided between the second block body (231) and the coupling member (236), and a fastening nut (238) that is fastened to the shaft member (234) is included.

[0088] The shaft member (234) is provided in the form of a rod that extends in the vertical direction and has a circular cross-section. A second track roller (235) is rotatably coupled to the lower part of the shaft member (234).

[0089] The shaft member (234) is inserted into a bearing (240) provided in the bearing insertion part (2311) of the second block body (231). The shaft member (234) is inserted into the inner ring of the bearing (240) and is provided to protrude upward past the bearing (240). A male screw thread is formed on the upper part of the shaft member (234) that protrudes past the bearing (240).

[0090] At the lower end of the shaft member (234), a shaft member jaw (2341) is formed that extends radially outward and upward, and the shaft member jaw (2341) engages with the inner ring of the bearing (240), and the inner ring of the bearing (240) is supported by the shaft member jaw (2341).

[0091] The above-mentioned installation member (232) is a hollow body having a through hole formed in the upper and lower directions on the inside. The above-mentioned installation member (232) is positioned above the bearing (240) inserted into the bearing insertion part (2311).

[0092] The above-mentioned installation member (232) is square or circular, and a circular through hole is formed on the inner side that penetrates in the vertical direction. The above-mentioned installation member (232) is provided with an installation part (2321) that penetrates in the vertical direction, spaced apart along the edge of the through hole. If the above-mentioned installation member (232) is square, installation parts (2321) are provided at the four corners. A bolt is inserted into the installation part (2321), and the bolt is screwed into a screw groove (or screw hole) of the second block body (231) formed at the location where the installation part (2321) is formed, thereby fixing the installation part (2321) to the second block body (231).

[0093] The bearing (240) is inserted into the bearing insertion part (2311) from the top, and the outer ring of the bearing (240) is seated on the lower jaw of the bearing insertion part (2311). The outer ring of the bearing (240) inserted into the bearing insertion part (2311) is fixed by being pressed between the installation member (232) and the lower jaw of the bearing insertion part (2311).

[0094] The above-mentioned connecting member (236) is provided on the upper part of the above-mentioned installation member (232). The above-mentioned connecting member (236) is provided in the shape of a circular plate. The above-mentioned connecting member (236) may be formed to be equal to the width of the second block body (231), or larger or smaller than the width of the second block body (231). A connecting member shaft hole (2363) and a plurality of connecting member holes (2361) are formed in the above-mentioned connecting member (236).

[0095] The above-mentioned coupling member shaft hole (2363) is formed through the center of the coupling member (236) in an upward and downward direction. The coupling member (236) has a shaft member (234) inserted into the coupling member shaft hole (2363) and is provided on the upper part of the installation member (232).

[0096] The above coupling member holes (2361) are formed in multiple numbers, spaced apart radially from the coupling member shaft holes (2363) and spaced apart along the circumferential direction. The coupling member holes (2361) are formed to penetrate in the vertical direction. A female screw is formed in the coupling member holes (2361). The coupling member holes (2361) may be formed as concave grooves.

[0097] The above coupling member (236) may further be provided with a ring-shaped spacer (236-1) that contacts the inner ring of the bearing (240) at the lower part of the coupling member (236). The spacer (236-1) may be formed as a cylindrical projection integrally provided at the lower part of the coupling member (236).

[0098] A fastening nut (238) is fastened to the threaded portion of the shaft member (234) that protrudes upward through the installation member (232) and the coupling member (236). By fastening the shaft member (234) and the fastening nut (238), the coupling member (236) presses the spacer (236-1) downward, thereby pressing and fixing the inner ring of the bearing (240) between the shaft member jaw (2341) and the spacer (236-1).

[0099] Accordingly, the coupling member (236) is rotatably provided on the second block body (231) via the bearing (240), and relative operation is possible between the coupling member (236) and the second block body (231) via the bearing (240).

[0100] A first block coupling part (2211) is formed in the first block body (221) of the first block part (220), which is spaced apart in the longitudinal direction and penetrates in the vertical direction. The first block coupling part (2211) may be formed as an upwardly concave groove. A female screw is formed in the first block coupling part (2211). The first block coupling part (2211) is formed spaced apart in the longitudinal direction from the track roller hole.

[0101] As shown in FIGS. 4 and 6, the moving member (250) is provided by being coupled to the upper part of the block portion. The moving member (250) is coupled to a part or device to be moved and moves along the rail (210) together with the movement of the block portion.

[0102] A connecting member (236) is rotatably provided on the second block body (231) of the second block part (230), and the moving member (250) is connected to the connecting member (236) of the second block part (230) and the first block body (221).

[0103] A plurality of movable member coupling holes are formed in the movable member (250) into which a bolt is inserted for coupling to the block portion. The movable member coupling holes include a plurality of first movable member coupling holes (255) for coupling to the first block portion (220) and a plurality of second movable member coupling holes (257) for coupling to the second block portion (230).

[0104] The above-mentioned moving member (250) has a moving member installation part (251) in the shape of a concave groove formed at the bottom.

[0105] The above-mentioned movable member installation part (251) is formed at the lower part of the movable member (250) where the second block body (231) of the second block part (230) is located, and a plurality of second movable member coupling holes (257) are formed in the movable member installation part (251) at a distance in the circumferential direction. In the movable member (250) where the first block body (221) of the first block part (220) is located, a plurality of first movable member coupling holes (255) are formed at a distance in the longitudinal direction and penetrate in the vertical direction.

[0106] In the moving member installation part (251) of the moving member (250), a coupling member (236) provided in the second block body (231) is inserted into and seated in the moving member installation part (251).

[0107] After the coupling member (236) is inserted into the movable member installation part (251) of the movable member (250), a bolt is inserted into the second movable member coupling hole (257), and the movable member (250) is coupled to the second block part (230) by screwing into the coupling member hole (2361) formed in the coupling member (236). It is also possible to form a through hole, the movable member hole (253), on the inner side of the movable member installation part (251) so that the shaft member (234) and the fastening nut (238) are exposed.

[0108] The first block part (220) inserts a bolt into the first movable member coupling hole (255) and screws it into the first block coupling part (2211) formed on both sides in the longitudinal direction of the first block body (221) to connect the movable member (250) to the first block part (220).

[0109] A linear motion guide (200) according to the present invention is provided with a coupling member (236) that is rotatably provided on the second block body (231) via a bearing (240), and by coupling the coupling member (236) to a moving member (250), the second block body (231) becomes rotatable relative to the moving member (250). That is, when the coupling member (236) is fixedly coupled to the moving member (250), the second block body (231) becomes rotatable relative to the moving member (250).

[0110] As illustrated in FIG. 7, even if there is a step (t1) that is misaligned in the width direction or a gap (t2) in the rail (210) connection part, the second block part (230) has a structure that includes a coupling member (236) that is rotatably provided to the second block body (231) via a bearing (240), so the second block body (231) can rotate in the "A" direction, and thus the second block part (230) can travel smoothly, and accordingly, the linear motion guide (200) can travel smoothly along the rail (210) even if an error occurs during the processing or assembly process.

[0111] The linear motion guide according to the present invention enables smooth movement along the rail even if an error occurs.

Claims

1. It includes a bar-shaped rail (210) and a block section that travels along the rail (210); the block section includes a first block section and a second block section provided on both sides in the width direction of the rail, and the first block section and the second block section include a block body and a plurality of track rollers provided on the block body that travel along the length direction of the rail (210); A linear motion guide characterized in that at least one of the first block part and the second block part includes a coupling member rotatably provided on the block body via a bearing (240).

2. In claim 1, a bearing insertion portion having a jaw portion at the bottom is formed in one or more of the first block portion and the second block portion; and the invention includes a bearing (240) inserted into the bearing insertion portion, a shaft member inserted into the bearing (240) and protruding upward past the bearing, an installation member coupled to the block portion by being screwed so as to be positioned above the bearing (240) inserted into the bearing insertion portion, and a fastening nut screwed to the shaft member; The above coupling member is provided on the upper part of the installation member with an axial member inserted therein; and the above coupling member is rotatable relative to the block body via a bearing (240), characterized by a linear motion guide.

3. In claim 1 or 2, further comprising a movable member (250) coupled to the upper part of the block portion; A bearing (240) is installed in the block body of the second block part, and a coupling member is rotatably provided in the block body through the bearing (240); The above-mentioned moving member (250) is characterized by being coupled to the coupling member of the second block part and the block body of the first block part, forming a linear motion guide.

4. In claim 1 or 2, further comprising a movable member (250) coupled to the upper part of the block portion; A bearing is installed in the block body of the first block and the second block, and a coupling member is rotatably provided in the block body through the bearing (240); A linear motion guide characterized in that the moving member (250) is coupled to the coupling member of the first block part and the second block part.

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