JP2014190438A - Closing member for raceway member fixing hole and motion guide device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a closing member for a raceway member fixing hole of a motion guide device enabling a knock-in work to be easily carried out and preventing the closing member for the raceway member fixing hole from being caved-in by an external force.SOLUTION: A closing member 21 for a raceway member fixing hole of this invention comprises a first member 22 mounted on a head part 4a of a fastening member 4 arranged in the raceway member fixing hole 5 and the like and a second member 24 for closing the raceway member fixing hole 5. One of the first member 22 and the second member 24 is inserted into the other, the other of the first member 22 and the second member 24 expands in a radial direction, and the other of the first member 22 and the second member 24 is fixed to the inner surface of the raceway member fixing hole 5 and the like.

Description

  The present invention relates to a closing member for a track member mounting hole for closing a track member mounting hole of a track member of a motion guide device.

  The motion guide device is constructed by assembling a moving member to a raceway member extending in a longitudinal direction via rolling elements such as a large number of balls and rollers. The track member is attached to the base, and the moving member is attached to a movable body such as a table. The motion guide device is used to guide a linear motion (linear motion or curved motion) of a movable body such as a table. By utilizing the rolling motion of the rolling element, the motion of the movable body can be guided with high accuracy and lightness.

  In order to fix the track member to the base, a plurality of track member mounting holes are formed in the upper surface of the track member at intervals in the longitudinal direction. By passing a tightening member such as a bolt through the race member mounting hole and screwing the tightening member into the base, the head of the tightening member is seated on the counterbore seat surface of the race member mounting hole, and the race member is fastened to the base.

  If foreign matter such as dust adheres to the rolling element rolling portion of the raceway member, smooth rolling motion of the rolling element is hindered, so that the guide accuracy is lowered. In order to prevent this, a seal member is attached to both end surfaces of the moving member in the moving direction so as to scrape off foreign matters adhering to the track member and prevent the foreign member from entering the moving member. However, when the motion guide device is used in an environment with a lot of dust, foreign matters such as dust accumulate in the race member mounting hole of the race member. The foreign matter accumulated in the track member mounting hole cannot be removed by the seal member that scrapes the upper surface of the track member, and may enter the moving member. The foreign matter that has entered the inside of the moving member may adhere to the rolling element rolling portion and hinder the smooth rolling motion of the rolling element.

  In order to prevent dust from accumulating in the track member mounting hole, the track member mounting hole is closed by a track member mounting hole blocking member (also called a cap). Patent Document 1 discloses a closing member for a track member mounting hole including a closing member main body and an outer peripheral covering member provided on an outer peripheral surface of the closing member main body. The track member mounting hole closing member is attached to the track member as follows. First, the blocking member is temporarily placed on the track member so as to close the track member mounting hole. Next, the temporarily placed blocking member is driven into the track member mounting hole so that the upper surface of the block member and the surface of the track member are flush with each other. When the blocking member is inserted into the track member mounting hole, the outer peripheral covering member of the blocking member is sandwiched between the outer peripheral surface of the blocking member main body and the inner peripheral surface of the track member mounting hole and elastically deforms. Thereby, the position of the closing member is kept constant.

Japanese Utility Model Publication No. 4-117914

  However, the conventional track member mounting hole blocking member has a problem that workability is poor because the blocking member temporarily placed on the upper surface of the track member is driven. In some cases, if the user is not used to work, the closing member may be damaged by driving the closing member diagonally.

  In addition, since the outer diameter portion of the closing member is fixed only by an interference fit (elastic deformation), there is a problem that it is necessary to manage the inner diameter dimension and the surface roughness of the race member mounting hole. If the tightening allowance is insufficient, the closing member may be depressed, tilted, or fall off. On the other hand, when the tightening margin is excessive, it is necessary to remove the flash generated from the outer diameter portion of the closing member, or the closing member is deformed and the appearance is lost.

  Accordingly, an object of the present invention is to provide a closing member for a track member mounting hole of a motion guide device that can be driven easily and can prevent the closing member from being depressed by an external force.

  In order to solve the above problems, one aspect of the present invention is used in a motion guide device in which a moving member is movably assembled to a track member, and blocks the track member mounting hole for mounting the track member to a base. A closing member for a mounting hole, which is a first member placed on the head of a tightening member disposed in the track member mounting hole, a hole in the head of the tightening member, or a bottom surface of a recess formed in the track member And a second member that closes the track member mounting hole, and the other of the first member and the second member is inserted by inserting one of the first member and the second member into the other. A rail that expands in the radial direction and the other of the first member and the second member is fixed to the inner surface of the track member mounting hole, the inner surface of the head hole of the tightening member, or the inner surface of the recess of the track member Mounting It is a use closure member.

  According to the present invention, since the closing member is self-supporting on the head of the tightening member or the like, the driving operation is stable, and unexpected deformation and depression of the closing member due to driving are suppressed. In addition, since the other of the first member and the second member expanded in the radial direction is fixed to the inner surface of the track member mounting hole or the like, the closing member can be prevented from being depressed or falling off due to an external force.

The perspective view (including partial sectional view) which shows the movement guide apparatus with which the closure member for rail attachment holes of embodiment of this invention is mounted | worn Front view of motion guide device with end plate removed The perspective view of the blocking member for rail attachment holes of 1st embodiment of this invention (FIG. 3 (a) shows an upper surface side perspective view, FIG.3 (b) shows a lower surface side perspective view). Sectional drawing of the closure member for rail attachment holes of the said embodiment FIG. 5A shows a state in which the closing member for the rail mounting hole according to the above embodiment is driven into the mounting hole of the rail (FIG. 5A shows a state where the closing member is self-supported on the head of the bolt, and FIG. (Indicates the state in which the member is driven) Process diagram showing deformation of plug and sleeve when plug of embodiment is inserted into sleeve (FIG. 6A shows a state before the plug is inserted into the sleeve, and FIG. 6B shows a state during insertion. 6 (c) shows the state after insertion) The side view of the blocking member for rail attachment holes of 2nd embodiment of this invention FIG. 8 (a) shows a state where the closing member is self-supported on the head of the bolt when the rail mounting hole closing member of the second embodiment of the present invention is driven into the rail mounting hole. (B) shows the state in which the closing member is driven) FIG. 9A is a process diagram when driving the rail mounting hole closing member according to the third embodiment of the present invention into the rail mounting hole (FIG. 9A shows a state in which the closing member is self-supporting on the head of the bolt. (B) shows the state in which the closing member is driven) FIG. 10A is a top perspective view and FIG. 10B is a bottom perspective view of a rail mounting hole blocking member according to a fourth embodiment of the present invention. FIG. 11 (a) shows a state where the closing member is self-supported on the head of the bolt when the rail mounting hole closing member according to the fourth embodiment of the present invention is driven into the rail mounting hole. (B) shows the state in which the closing member is driven) Sectional drawing (FIG. 12 (a) shows the state which made the closure member self-supported on the head of a bolt, and FIG.12 (b) drive in the closure member of the closure member for rail attachment holes of 5th embodiment of this invention. Indicates the state)

  Hereinafter, a rail attachment hole closing member (hereinafter simply referred to as a closing member) according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. First, the motion guide device to which the closing member is attached will be described. In the drawings, the same components are denoted by the same reference numerals.

  FIG. 1 shows a perspective view of the motion guide device, and FIG. 2 shows a front view of the motion guide device with the end plate removed. The motion guide device is a rail 1 as a track member extending linearly in the longitudinal direction, and a moving member that is assembled to the rail 1 through a number of rolling elements 3 such as balls and rollers so as to be linearly movable in the longitudinal direction. A moving block 2.

  As shown in FIG. 1, rail mounting holes 5 as a plurality of track member mounting holes are opened on the upper surface of the rail 1 (that is, the surface opposite to the base) at intervals in the longitudinal direction. A bolt 4 such as a hexagon socket head bolt is inserted into the rail mounting hole 5 as a fastening member for fixing the rail 1 to the base. As shown in the front view of FIG. 2, the rail mounting hole 5 has a counterbore portion 5 a having a diameter larger than the head portion 4 a of the bolt 4 and a bolt insertion hole 5 b slightly larger than the screw portion 4 b of the bolt 4. They are formed concentrically (see also FIG. 5 (a)). The height of the counterbore 5a is set higher than the height of the head 4a of the bolt 4 so that the bolt 4 is completely buried in the rail mounting hole 5. By passing the bolt 4 through the rail mounting hole 5 and screwing the bolt 4 into the base 8, the head 4 a of the bolt 4 is seated on the seating surface of the counterbore portion 5 a of the rail 1, and the rail 1 is fixed to the base 8. A movable body such as a table that moves linearly is attached to the upper surface of the moving block 2 using a bolt (not shown). 1 and 2 show a state in which the bolt 4 is passed through the rail mounting hole 5 of the rail 1 and the bolt 4 is fastened to the base 8. Thereafter, the rail mounting hole 5 is closed by the closing member. FIGS. 1 and 2 show a state before the rail mounting hole 5 is closed by the closing member.

  As shown in FIG. 2, the rail 1 has a substantially quadrangular cross section, and a plurality of rolling element rolling portions 1 a on which the rolling element rolls are formed on the upper surface and side surfaces thereof. The rolling element rolling part 1 a extends along the longitudinal direction of the rail 1. In this embodiment, a total of four rolling element rolling portions 1 a are formed on both sides of the rail 1.

  As shown in FIG. 1, the moving block 2 includes a moving block main body 11 and end plates 12 provided on both end surfaces of the moving block main body 11 in the moving direction. The moving block body 11 includes a central portion 11-1 facing the upper surface of the rail 1, and a side wall portion 11-2 extending downward from the left and right sides in the width direction of the central portion 11-1 and facing the left and right side surfaces of the rail 1. And comprising. The moving block main body 11 is formed with a loaded rolling element rolling part 2a facing the rolling element rolling part 1a of the rail 1 and a no-load return path 7 parallel to the loaded rolling element rolling part 2a. The end plate 12 is formed with an outer peripheral side of a direction changing path 6 ′ connecting the loaded rolling element rolling portion 2 a and the no-load return path 7.

  A rolling element circulation path is formed by the loaded rolling element rolling part 2a, the no-load return path 7 and the direction changing path 6 'of the moving block 2. A plurality of rolling elements 3 are arranged and accommodated in the rolling element circulation path. The plurality of rolling elements 3 are held in series by the retainer 8 so as to be freely rotatable. The retainer 8 includes a spacer 9 that is interposed between the rolling elements, and a band 10 that connects the spacer.

  A clearance having a U-shaped cross section is provided between the rail 1 and the moving block 2 surrounding it. In order to close this gap, seal members 13 corresponding to the outer shape of the rail 1 are attached to both end surfaces of the moving block 2 in the moving direction. The seal member 13 prevents foreign matter such as dust, dust, and sawdust from entering the inside of the moving block 2 and adhering to the rolling element 3.

  However, when the motion guide device is used in an environment with a lot of dust, foreign matter also accumulates in the rail mounting hole 5 of the rail 1. The foreign matter accumulated in the rail mounting hole 5 cannot be removed by the seal member 13 that scrapes the upper surface of the rail 1 and may enter the moving block 2. The foreign matter that has entered the inside of the moving block 2 adheres to the rolling element rolling part 1a and the load rolling element rolling part 2a, and may hinder smooth rolling motion of the rolling element 3. In order to prevent this, the rail mounting hole 5 of the rail 1 is covered with a closing member 21 (see FIG. 5B).

  FIG. 3A shows a top perspective view of the closing member 21, and FIG. 3B shows a bottom perspective view of the closing member 21. As shown in FIG. 3A, the closing member 21 includes a sleeve 22 as a first member placed on the head 4a of the bolt 4, a plug 24 as a second member formed integrally with the sleeve 22, Is provided.

  FIG. 4 shows a cross-sectional view along the center line of the closing member 21. The sleeve 22 is cylindrical. The plug 24 includes a disk-shaped head portion 24a and a cylindrical shaft portion 24b having a smaller diameter than the outer diameter of the head portion 24a. The head portion 24a of the plug 24 has a role of covering the rail mounting hole 5, and the shaft portion 24b of the plug 24 has a role of entering the sleeve 22 and expanding the sleeve 22 in the radial direction. The center line of the plug 24 and the center line of the sleeve 22 coincide with each other, and the distal end portion of the outer periphery of the shaft portion 24b of the plug 24 and the end portion of the inner periphery of the sleeve 22 are coupled. The connecting portion 23 between the plug 24 and the sleeve 22 is formed with a cut 23a having a circular arc shape over the entire circumference so as to be easily separated.

  In this embodiment, the plug 24 and the sleeve 22 are resin molded products. For the material of the plug 24 and the sleeve 22, for example, PP (polypropylene) or PE (polyethylene) is used in consideration of environmental resistance. Since the shaft portion 24b of the plug 24 is undercut, a slide core for forming the undercut shaft portion 24b is incorporated in the mold during resin molding. The material of the plug 24 and the sleeve 22 is not limited to resin, and may be a metal such as stainless steel, aluminum, or brass, and the materials may be different from each other. The plug 24 and the sleeve 22 may be integrally formed by bonding.

  The dimensions of the plug 24 and the sleeve 22 are as follows. The outer diameter φ1 of the head 24a of the plug 24 is equal to or smaller than the inner diameter φ2 (see FIG. 5A) of the counterbore portion 5a of the rail mounting hole 5. For fitting between the head portion 24a of the plug 24 and the counterbore portion 5a of the rail mounting hole 5, a clearance fit with a gap between them is used. The outer diameter φ3 of the sleeve 22 is also equal to or smaller than the inner diameter φ2 of the counterbore portion 5a of the rail mounting hole 5. In order to fit the sleeve 22 and the counterbore part 5a of the rail mounting hole 5, a clearance fit with a gap between them is used. The outer diameter φ4 of the shaft portion 24b of the plug 24 is larger than the inner diameter φ5 of the sleeve 22. For fitting between the shaft portion 24 b of the plug 24 and the sleeve 22, an interference fit with a tightening space between them is used.

  The length L1 from the head 24a of the plug 24 to the sleeve 22 is such that when the plug 24 is driven until the upper surface 24a1 of the head 24a of the plug 24 is flush with the surface 1b of the rail 1, The clearance δ1 (see FIG. 5B) between the sleeve 22 and the sleeve 22 is set to open, that is, the plug 24 can be driven into the sleeve 22. Specifically, the length from the head 24a of the plug 24 to the sleeve 22 is such that the top surface 24a1 of the head 24a of the plug 24 and the surface of the rail 1 when the closing member 21 is self-supported on the head 24a of the bolt 4 It is set longer than the length L2 up to 1b (see FIG. 5A). If there is no gap δ1 between the head portion 24a of the plug 24 and the sleeve 22, the plug 24 cannot be driven any further, and the upper surface 24a1 of the head portion 24a of the plug 24 is lifted from the surface 1b of the rail 1. By making the clearance δ1 open between the head 24a of the plug 24 and the sleeve 22, the upper surface 24a1 of the head 24a of the plug 24 can be arranged in the same plane as the surface 1b of the rail 1.

  FIG. 5 shows a process diagram when driving the closing member 21 of this embodiment into the mounting hole 5 of the rail. As described above, in the rail mounting hole 5, the counterbore part 5a and the bolt insertion hole 5b are formed concentrically. When the bolt 4 is screwed into the base, the head 4a of the bolt 4 is seated on the seating surface of the counterbore part 5a of the rail 1, and the rail 1 is fixed on the base. The closing member 21 of this embodiment is installed in the rail mounting hole 5 after the bolt 4 is installed in the rail mounting hole 5.

  First, as shown in FIG. 5A, the closing member 21 is inserted into the counterbore portion 5 a of the rail mounting hole 5, and the closing member 21 is made to stand on the head 4 a of the bolt 4. Since the fit between the sleeve 22 of the closing member 21 and the counterbore part 5a of the rail mounting hole 5 is a clearance fit, the insertion of the closing member 21 into the counterbore part 5a is easy. Even if it is called a clearance fit, the clearance between the sleeve 22 of the closing member 21 and the counterbore part 5a is very small. For this reason, if the closing member 21 is inserted into the rail mounting hole 5, the closing member 21 is positioned at the center of the rail mounting hole 5.

  Next, the closing member 21 is driven into the rail mounting hole 5. The closing member 21 is preferably driven by placing a metal fitting 25 having a flat top and bottom surface on the closing member 21 and hitting the metal fitting 25 with a plastic hammer 26. You can also type 21. By driving the closing member 21 through the contact fitting 25, it is easy to drive the closing member 21 so that the upper surface of the closing member 21 is flush with the surface 1b of the rail 1.

  The sleeve 22 of the closing member 21 is placed on the head 4 a of the bolt 4. Although the closing member 21 before use is a single product, as shown in FIG. 5B, when the closing member 21 is driven, the plug 24 and the sleeve 22 of the closing member 21 are separated by brittle fracture. The closing member 21 functions separately as a plug 24 and a sleeve 22 of two parts. When the shaft 24b of the plug 24 enters the sleeve 22, the plug 24 is press-fitted into the sleeve 22 because the shaft 24b of the plug 24 and the sleeve 22 are fitted (minus clearance is indicated by δ2). It expands in the radial direction (elastic deformation or plastic deformation). As a result, the sleeve 22 is fixed to the inner surface of the counterbore part 5a of the rail mounting hole 5 in a protruding manner.

  FIG. 6 shows the deformation of the plug 24 and the sleeve 22 when the plug 24 is inserted into the sleeve 22. As shown in FIG. 6A, when the plug 24 and the sleeve 22 are integrated, the outer diameter φ1 of the head portion 24a of the plug 24 is larger than the outer diameter φ3 of the sleeve 22. As shown in FIG. 6B, when the closing member 21 is driven, a crack 23b is obliquely formed in the connecting portion 23 of the plug 24 and the sleeve 22, the plug 24 and the sleeve 22 are separated, and the shaft portion 24b of the plug 24 is It is inserted inside the sleeve 22. Then, the sleeve 22 expands in the radial direction, and the outer diameter φ3 of the sleeve 22 becomes larger than the outer diameter φ1 of the head portion 24a of the plug 24. As a result, the sleeve 22 is fixed to the inner surface of the counterbore part 5a of the rail mounting hole 5 in a protruding manner. As shown in FIG. 6C, when the top surface 24a1 of the head 24a of the plug 24 is driven until it is flush with the surface 1b of the rail 1, the head 24a of the plug 24 A gap δ1 is opened between the sleeve 22 and the sleeve 22. A clearance is opened so that there is a driving allowance between the plug 24 and the head 4a of the bolt 4.

  FIG. 7 shows the closing member 31 of the second embodiment of the present invention. Similarly to the closure member 21 of the first embodiment, the closure member 31 of this embodiment includes a sleeve 32 as a first member and a plug 34 as a second member formed integrally with the sleeve 32. The plug 34 includes a disk-shaped head portion 34a and a shaft portion 34b extending from the head portion 34a in the vertical direction. The sleeve 32 is formed in a cylindrical shape. The sleeve 32 of this embodiment has a smaller diameter than the sleeve 22 of the closing member 21 of the first embodiment, and is inserted into the hole (hexagon wrench hole) of the head 4a of the bolt 4 (see FIG. 5A). Is done.

  FIG. 8 shows a process diagram when the closing member 31 of the second embodiment is driven into the mounting hole 5 of the rail. First, as shown in FIG. 8A, the sleeve 32 of the closing member 31 is inserted into the hole 4 a 1 of the head 4 a of the bolt 4, and the closing member 31 is self-supported in the hole 4 a 1 of the head 4 a of the bolt 4. The fit between the sleeve 32 of the closing member 31 and the hole 4a1 of the head 4a of the bolt 4 is set to a clearance fit.

  Next, as shown in FIG. 8B, when the closing member 31 is driven into the rail mounting hole 5, the plug 34 and the sleeve 32 of the closing member 31 are separated by brittle fracture, and the shaft portion 34b of the plug 34 becomes the sleeve. 32 is inserted. When the shaft portion 34 b of the plug 34 enters the sleeve 32, the sleeve 32 expands in the radial direction (elastic deformation or plastic deformation) because the shaft portion 34 b of the plug 34 and the sleeve 32 are fit. As a result, the sleeve 32 is fixed to the inner surface of the hole 4a1 of the head 4a of the bolt 4 so as to stretch.

  Like the closing member 31 of the second embodiment, the sleeve 32 of the closing member 31 can be fixed to the inner surface of the hole 4a1 of the head 4a of the bolt 4. If the coaxiality between the bolt 4 and the rail mounting hole 5 cannot be secured, the closing member 31 is fixed to the rail 1 in a state shifted from the center of the rail mounting hole 5, so the coaxiality between the bolt 4 and the rail mounting hole 5 is It is desirable to ensure.

  FIG. 9 shows a process diagram when the closing member 41 according to the third embodiment of the present invention is driven into the mounting hole 5 of the rail. Similarly to the closing members 21 and 31 of the first and second embodiments, the closing member 41 of this embodiment also has a sleeve 42 as a first member and a plug 44 as a second member formed integrally with the sleeve 42. And comprising. The plug 44 includes a disk-shaped head portion 44a and a shaft portion 44b extending from the head portion 44a in the vertical direction. The sleeve 42 includes a cylindrical main body portion 42a and a flange portion 42b projecting radially from the upper end portion of the main body portion 42a. The head portion 44a of the plug 44 is placed on the flange portion 42b. The plug 44 and the sleeve 42 are integrally formed by bonding. The sleeve 42 is inserted into the hole 4a1 (the hole for the hexagon wrench) of the head 4a of the bolt 4 in the same manner as the sleeve 32 of the second embodiment.

  First, as shown in FIG. 9A, the sleeve 42 of the closing member 41 is inserted into the hole 4 a 1 of the head 4 a of the bolt 4, and the closing member 41 is self-supported in the hole 4 a 1 of the head 4 a of the bolt 4. Next, as shown in FIG. 9B, when the closing member 41 is driven, the shaft portion 44 b of the plug 44 is inserted into the main body portion 42 a of the sleeve 42. When the shaft portion 44b of the plug 44 enters the main body portion 42a of the sleeve 42, the shaft portion 44b of the plug 44 and the main body portion 42a of the sleeve 42 fit together, so that the main body portion 42a of the sleeve 42 expands in the radial direction ( Elastic deformation or plastic deformation). As a result, the main body portion 42 a of the sleeve 42 is fixed in such a manner as to stretch into the hole 4 a 1 of the head 4 a of the bolt 4. Further, the flange portion 42 b of the sleeve 42 is bent so that the shaft portion 44 b of the plug 44 can enter the main body portion 42 a of the sleeve 42.

  FIG. 10A shows a top perspective view of the closing member 51 of the fourth embodiment of the present invention, and FIG. 10B shows a bottom perspective view. The closing member 51 of this embodiment is formed by connecting a cover 52 made of a thin plate to the head of the plug 24. Since the structure of the plug 24 and the sleeve 22 is the same as that of the plug 24 and the sleeve 22 of the first embodiment, the same reference numerals are given and description thereof is omitted. The cover 52 is formed in a rectangular shape elongated in the length direction of the rail 1. The cover 52 is provided to cover the plurality of rail attachment holes 5 that are opened in the upper surface of the rail. The plug 24 and the sleeve 22 are fixed to both ends in the length direction of the cover.

  As shown in FIG. 11A, a pair of concave portions 1 d having a circular cross section are formed at both ends in the length direction of the rail 1 at positions away from the rail mounting holes 5. A pair of plugs 24 and a sleeve 22 are inserted into the pair of recesses 1d. A cover mounting groove 1 e having a depth equal to the thickness of the cover 52 is formed on the upper surface of the rail 1.

  The closing member 51 of this embodiment is attached to the rail 1 as follows. As shown in FIG. 11A, the sleeve 22 of the closing member 51 is inserted into the recess 1d of the rail 1, and the sleeve 22 is placed on the bottom surface of the recess 1d. Next, as shown in FIG. 11B, when the closing member 51 is driven, the shaft portion 24 b of the plug 24 is inserted into the sleeve 22. When the shaft portion 24b of the plug 24 enters the sleeve 22, the sleeve 22 expands in the radial direction (elastic deformation or plastic deformation). As a result, the sleeve 22 is fixed in such a manner as to stretch on the inner surface of the recess 1d. The cover 52 is mounted in the cover mounting groove 1e on the upper surface of the rail 1. Like the closing member 51 of this embodiment, the closing member 51 can be self-supported on the bottom surface of the recess 1d of the rail 1, or like the closing members 21, 31, 41 of the first to third embodiments. In addition, the closing members 21, 31, 41 can be made to stand on the head 4 a of the bolt 4.

  FIG. 12 shows a closing member 61 according to the fifth embodiment of the present invention. In the closing members 21, 31, 41 of the first to fourth embodiments, the sleeves 22, 32, 42 as the first members are placed on the head 4a of the bolt 4, etc., and the plugs 24, 34 and 44 block the rail mounting hole 5, but in the closing member 61 of the fifth embodiment, the plug 62 as the first member is placed on the head 4a of the bolt 4 as shown in FIG. Then, the sleeve 64 as the second member closes the rail mounting hole 5. The plug 62 is formed in a disk shape. The sleeve 64 includes a disk-shaped head portion 64a and a cylindrical peripheral wall portion 64b provided around the head portion 64a. After placing the closing member 61 on the head 4 a of the bolt 4, when the closing member 61 is driven, the plug 62 is inserted into the sleeve 64. Then, since the outer diameter of the plug 62 is larger than the inner diameter of the peripheral wall 64b of the sleeve 64, the peripheral wall 64b of the sleeve 64 expands in the radial direction as shown in FIG. 5 is fixed to the inner surface and the like.

  According to the blocking members 21, 31, 41, 51, 61 of the present embodiment, the following effects are obtained.

  Since the blocking members 21, 31, 41, 51, 61 themselves are self-supporting, the driving operation is stable, and unexpected deformation and depression of the blocking members 21, 31, 41, 51, 61 due to driving are suppressed.

  There is no space between the closing members 21, 31, 41, 51, 61 and the head 4a of the bolt 4, and the sleeves 22, 32, 42, 42 of the closing members 21, 31, 41, 51, 61, 64 is fixed in such a manner as to stretch against the inner surface of the counterbore part 5a, etc., so that the positions of the driven closure members 21, 31, 41, 51, 61 are difficult to be displaced with respect to external force, difficult to be pulled out, difficult to tilt, and depressed. It becomes difficult.

  The closing members 21, 31, 41, 51, 61 are fixed to the counterbore part 5 a using the radial expansion of the sleeves 22, 32, 42, 64, and the closing members 21, 31, 41, 51, 61 are Since the structure does not depend on the fitting strength with the rail mounting hole 5, the inner diameter and the surface roughness of the counterbore part 5 a of the rail mounting hole 5 are used for mounting the blocking members 21, 31, 41, 51, 61. There is no need to perform special dimension management (for example, making the surface roughness of the counterbore part 5a smaller while making the inner diameter of the counterbore part 5a smaller). Since the accuracy management of the counterbore part 5a of the rail mounting hole 5 can be managed with general tolerances, the management cost can be reduced. Even if variations occur in the diameter and depth of the counterbore 5a, these variations can be absorbed.

  Since the blocking members 21, 31, 41, 51, 61 are fixed not in the vicinity of the upper surface of the rail 1 but inside the rail mounting hole 5, there is little occurrence of flash from the blocking members 21, 31, 41, 51, 61. Become.

  Since the plugs 24, 34, 44, 62 and the sleeves 22, 32, 42, 64 are integrally formed, the management becomes easy, and the plugs 24, 34, 44, 62 and the sleeves 22, 32, 42, 64 The coaxiality can be secured.

  When the plugs 24, 34, 44 are driven until the top surfaces of the heads 24a, 34a, 44a of the plugs 24, 34, 44 are flush with the surface 1b of the rail 1, the heads 24a, 34a have a driving allowance. 44a and the sleeves 22, 32, 42 are opened, so that the upper surfaces of the heads 24a, 34a, 44a of the plugs 24, 34, 44 can be prevented from floating from the surface 1b of the rail 1.

  In addition, this invention is not limited to the said embodiment, In the range which does not change the summary of this invention, it can change variously.

  In the above embodiment, the plug and the sleeve are manufactured from the same resin material. However, they can be manufactured by two-color molding using different resin materials. It is also possible to use a hard resin material for the plug and a soft resin material for the sleeve. Moreover, metal materials, such as brass, aluminum, and stainless steel, or metal materials having different strengths can be used for the plug and the sleeve.

  In the above embodiment, the plug and the sleeve are integrally formed, but the plug and the sleeve may be separated. In this case, in order to facilitate centering of the plug and the sleeve, it is desirable that the contact surface between the plug and the sleeve be formed in a taper.

  An O-ring may be wound around the head of the plug, and the clearance between the plug and the rail mounting hole may be eliminated by the O-ring.

  In the above embodiment, the sleeve is fixed to the inner surface of the counterbore portion of the rail mounting hole. However, a recess (second counterbore portion) having a larger diameter than the counterbore portion is formed in the rail mounting hole, and the sleeve is recessed (first The sleeve can be fixed to the inner surface of the recess (second counterbore part) by placing it on the bottom surface of the second counterbore part and driving in the plug.

  In the above embodiment, a clearance fit is used for the fit between the head portion of the plug and the counterbore portion of the rail mounting hole, but an interference fit can also be used. In this case, since it is fixed to the rail mounting hole at two places, the head portion of the plug and the sleeve, the position driven against the external force is more difficult to be displaced.

  In the above embodiment, the example of the rolling type motion guide device in which the rolling element is interposed between the rail and the moving block has been described. However, the present invention is a sliding type in which the rolling element is not interposed between the rail and the moving block. It can also be applied to other motion guide devices.

DESCRIPTION OF SYMBOLS 1 ... Rail (track member), 1b ... Surface, 1d ... Recess, 4 ... Bolt (tightening member), 4a ... Bolt head, 4a1 ... Bolt head hole, 5 ... Rail mounting hole (Track member mounting hole) ), 5a ... Counterbore part, 5b ... Bolt insertion hole, 21, 31, 41, 51, 61 ... Closure member, 22, 32, 42 ... Sleeve (first member), 24, 34, 44 ... Plug (second member) ), 24a, 34a, 44a ... the head of the plug, 24a1 ... the top surface of the plug, 24b, 34b, 44b ... the shaft portion of the plug, 62 ... the plug (first member), 64 ... the sleeve (second member).

Claims (4)

A closing member for a track member mounting hole that is used in a motion guide device in which a moving member is movably assembled to a track member and closes a track member mounting hole for mounting the track member to a base,
A first member placed on the head of the tightening member disposed in the track member mounting hole, a hole in the head of the tightening member, or a bottom surface of the recess formed in the track member;
A second member for closing the track member mounting hole,
By inserting one of the first member and the second member into the other, the other of the first member and the second member expands in the radial direction, and the other of the first member and the second member A closing member for a track member mounting hole of a motion guide device fixed to the inner surface of the track member mounting hole, the inner surface of the hole of the head of the tightening member, or the inner surface of the recess of the track member. The first member and the second member are integrally formed,
2. The closing member for a track member mounting hole of a motion guide device according to claim 1, wherein the first member and the second member are separated by driving the blocking member mounting hole blocking member. The first member is a sleeve;
The second member is a plug including a head that closes the track member mounting hole, and a shaft that is inserted into the sleeve and has a smaller diameter than the head.
When inserting the plug into the sleeve until the upper surface of the head of the plug is flush with the surface of the track member, there is a clearance between the head and the sleeve so that there is a driving allowance. The closing member for a track member mounting hole of the motion guide device according to claim 1, wherein the member is opened. A track member;
A moving member movably assembled to the track member;
A motion guide apparatus comprising: the track member mounting hole closing member according to claim 1.

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