JP2008082446A - Motion guiding device and installation method for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motion guiding device capable of simplifying installation, by absorbing misalignment of a mating part for installing a track rail. <P>SOLUTION: This motion guiding device has the track rail 1 forming a rolling body rollingly traveling groove 4 extending in the longitudinal direction, a moving block 2 forming a load rolling body rollingly traveling groove 7 opposed to the rolling body rollingly traveling groove 4 of the track rail 1, and a plurality of rolling bodies 3 stored in a rolling body circulating passage including the load rolling body rollingly traveling groove 7 of the moving block 2. A leg member 12 projecting in the direction crossing with the longitudinal direction of the track rail 1, is arranged in a position of not hindering the movement of the moving block 2 of the track rail 1, and the track rail 1 is installed in the mating part by using the leg member 12. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a motion guide device for guiding a moving body to perform a linear motion or a curved motion.

  A motion guide device such as a linear guide guides the moving body to perform a linear motion or a curved motion. Rolling-type motion guide devices with rolling elements in the guide mechanism have the advantage that lighter movements can be obtained than slide-type motion guide devices, so a wide range of machine tools, semiconductor / liquid crystal manufacturing devices, robots, etc. Widely used in the field (see, for example, Patent Document 1).

  In the motion guide device, it is necessary to attach the track rail to a mating part such as a base with high accuracy. This is because if the mounting accuracy of the track rail is poor, an excessive load is applied to the rolling elements interposed between the track rail and the moving block. The method of attaching the track rail to the mating part includes, for example, the following steps. First, as shown in FIG. 13A, an abutment 31 serving as a reference surface is formed on the mounting surface of the counterpart component 30. Next, as shown in FIG. 13B, the track rail 33 is brought into close contact with the abutment 31 by the push screw 32. In this state, as shown in FIG. 13C, the mounting bolt 36 is inserted into the mounting hole 34 of the track rail 33, and the mounting bolt 36 is tightened to the specified torque using the torque wrench 35. A mounting hole 34 penetrating from the upper surface to the bottom surface is previously formed in the track rail 33. The mounting hole 34 is subjected to a counterbore process for flattening only the portion of the mounting bolt 36 that contacts the head. Then, the track rail 33 is coupled to the mating component 30 by inserting the mounting bolt 36 into the counterbore of the track rail 33 and fastening the mounting bolt 36 to the mating component 30.

Japanese Patent Laying-Open No. 2005-114034 (see page 1)

  However, in recent years, motion guide devices have been applied to the field of transportation equipment such as automobiles and airplanes. For example, a motion guide device is used as a guide mechanism for module parts of an automobile. In the field of transportation equipment such as automobiles and airplanes, the mating part to which the track rail of the motion guide device is attached is sometimes made of sheet metal, so the accuracy of the attachment surface tends to be rough. In addition, in these fields, the use environment of the motion guide device is severe and the temperature changes drastically, so that the amount of thermal deformation of the track rail and the counterpart component also increases.

  When a track rail is attached to a mating part that has a rough mounting surface and large thermal deformation, the misalignment of the mating part (roughness of the mounting surface and the amount of thermal deformation) appears directly as a misalignment of the rail. . In this case, the rolling elements interposed between the track rail and the moving block are subjected to rushing and an excessive load is applied to the rolling elements.

  Furthermore, the conventional mounting method in which the bolt is inserted into the counterbore of the track rail and the bolt is fastened to the mating part is time consuming and time consuming, and thus is not suitable for a module part of an automobile that is mass-produced.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a motion guide device that can absorb misalignment of a mating part to which a track rail is attached and can simplify the attachment, and an attachment method thereof.

The present invention will be described below.
In order to solve the above-mentioned problems, the invention according to claim 1 includes a track rail in which rolling element rolling grooves extending in the longitudinal direction are formed, and a load rolling element facing the rolling element rolling grooves of the track rail. A motion guide apparatus comprising: a moving block in which a rolling groove is formed; and a plurality of rolling elements accommodated in a rolling element circulation path including the loaded rolling element rolling groove of the moving block. A leg member that protrudes in a direction intersecting the longitudinal direction of the track rail is provided at a position that does not prevent the movement block from moving, and the track rail can be attached to a mating part using the leg member. This is a featured motion guide device.

  According to a second aspect of the present invention, in the motion guide apparatus according to the first aspect, the track rail includes the track rail in a direction intersecting a longitudinal direction of the track rail for attaching the track rail to the counterpart component. A mounting hole penetrating the track rail is not processed.

  According to a third aspect of the present invention, in the motion guide apparatus according to the first or second aspect, the leg member is processed with a screw for attaching the track rail to a mating part, or the track rail. A welded portion is provided that is welded to the mating part when attaching to the mating part.

  According to a fourth aspect of the present invention, in the motion guide apparatus according to any one of the first to third aspects, the track rail has a bottom surface, an upper surface on which the leg member is provided, and the rolling element rolling groove. A pair of left and right side surfaces, and the moving block is formed in a bowl shape as a whole, and is provided at a central portion facing the upper surface of the track rail, and at both ends in the width direction of the central portion, A pair of side walls facing the left and right side surfaces of the track rail, the rolling element is a ball, and on the left and right side surfaces of the track rail in a cross section perpendicular to the longitudinal direction of the track rail. The minimum value of the distance between the left and right rolling element rolling grooves formed is smaller than the diameter of the ball.

  According to a fifth aspect of the present invention, in the motion guide device according to any one of the first to fourth aspects, the track rail is provided with a built-up portion having an arc-shaped cross section extending in a longitudinal direction of the track rail, The leg member is projection welded or friction welded to the build-up portion of the track rail.

  According to a sixth aspect of the present invention, in the motion guide apparatus according to any one of the first to fourth aspects, a bottom surface of the track rail to which the leg member is attached is formed as a flat surface, and a spherical end portion is formed. The leg member has projection welding or friction welding to the bottom surface of the track rail.

  According to a seventh aspect of the present invention, in the motion guide device according to any one of the first to sixth aspects, the leg member is elongated in a rod shape in a direction perpendicular to the longitudinal direction of the track rail, and the track rail. A plurality of them are provided at a constant pitch in the longitudinal direction.

  The invention according to claim 8 is a track rail in which rolling element rolling grooves extending in a longitudinal direction are formed, and a movement in which a load rolling element rolling groove facing the rolling element rolling grooves of the track rail is formed. A motion guide apparatus comprising a block and a plurality of rolling elements accommodated in a rolling element circulation path including the load rolling element rolling groove of the moving block, wherein the track rail has a bottom surface on which the leg member is provided, An upper surface and a pair of left and right side surfaces on which the rolling element rolling grooves are formed, and the moving block is formed in a bowl shape as a whole, the central portion facing the upper surface of the track rail, and the center And a pair of side wall portions facing the right and left side surfaces of the track rail, the rolling elements are balls, and are orthogonal to the longitudinal direction of the track rail. In the cross section in the direction Minimum value of the distance between the rolling element rolling groove of the left and right are formed on the left and right sides of the road rail, a motion guide device according to claim less than the diameter of the ball.

  According to a ninth aspect of the present invention, there is provided a track rail in which rolling element rolling grooves extending in the longitudinal direction are formed, and a movement in which a load rolling element rolling groove facing the rolling element rolling grooves of the track rail is formed. A motion guide device comprising: a block; and a plurality of rolling elements accommodated in a rolling element circulation path including the loaded rolling element rolling groove of the moving block. In the method, a leg member protruding in a direction intersecting with the longitudinal direction of the track rail is provided at a position of the track rail that does not prevent the moving block from moving, and the leg member is inserted into a through hole of a mating part. The track rail by inserting a leg member insertion step and a nut to a screw machined into the leg member, or by welding a welded portion provided at a tip of the leg member to the mating part. A mounting method of the motion guide device, characterized in that it comprises a track rail coupling step of coupling to the mating part.

  According to the first aspect of the present invention, the misalignment of the mating component can be absorbed by the leg member attached to the mating component being deformed by expansion and contraction or bending. Moreover, attachment can be simplified compared with the case where the conventional volt | bolt is used by attaching a track rail to a counterpart component using a leg member.

  According to the second aspect of the present invention, since the mounting hole is not processed in the track rail, the lateral width of the track rail can be reduced (when the mounting hole is processed in the track rail, the mounting hole is formed in the track rail. The width of the track rail is widened because a width greater than the diameter is required). Since the rail itself is easily bent, misalignment of the mating part can be absorbed even in the rail portion. In addition, by reducing the width of the track rail, the diameter of the rolling element interposed between the track rail and the moving block can be increased, and the misalignment absorption amount of the mating part is also increased at the rolling element portion. be able to.

  According to invention of Claim 3, a track rail can be easily attached to a counterpart component using a leg member.

  According to the invention described in claim 4, in the cross section in the direction orthogonal to the longitudinal direction of the track rail, the minimum value of the distance between the left and right rolling element rolling grooves formed on the left and right side surfaces of the track rail is the ball diameter. Therefore, the rigidity of the rail can be reduced relative to the rigidity of the ball. Since the rail itself is easily bent, misalignment of the counterpart component can be absorbed by the rail portion. Further, since the diameter of the rolling element can be made relatively large, the misalignment absorption amount of the mating part can be increased even at the rolling element portion.

  According to the fifth aspect of the present invention, since the built-up portion of the track rail and the leg member are in line contact, resistance during projection welding is increased, and heat can be easily generated.

  According to the sixth aspect of the present invention, since the bottom surface of the track rail and the leg member are in line contact or point contact, resistance during projection welding is increased, and heat can be easily generated.

  According to the seventh aspect of the present invention, the elongated track rail can be attached to the counterpart component.

  According to the invention described in claim 8, in the cross section in the direction orthogonal to the longitudinal direction of the track rail, the minimum value of the distance between the left and right rolling element rolling grooves formed on the left and right side surfaces of the track rail is the ball diameter. Therefore, the rigidity of the rail can be reduced relative to the rigidity of the ball. Since the rail itself is easily bent, misalignment of the counterpart component can be absorbed by the rail portion. Further, since the diameter of the rolling element can be made relatively large, the misalignment absorption amount of the mating part can be increased even at the rolling element portion.

  According to the ninth aspect of the present invention, the misalignment of the mating part can be absorbed by the leg member attached to the mating part being deformed by stretching or bending. Moreover, attachment can be simplified compared with the case where the conventional volt | bolt is used by attaching a track rail to a counterpart component using a leg member.

  1 to 3 show a motion guide apparatus according to an embodiment of the present invention. 1 is a perspective view of the motion guide device, FIG. 2 is a plan view, and FIG. 3 is a side view. The motion guide device of this embodiment guides the moving body to linearly move along the track rail by the rolling motion of the ball. As shown in FIG. 1 to FIG. 3, the motion guide device includes a track rail 1 that extends in a straight line and a hook-shaped moving block 2 that is slidably assembled along the track rail 1. A large number of balls 3 are interposed between the track rail 1 and the moving block 2 as rolling elements so as to be able to roll (see FIG. 4).

  As shown in FIG. 1, the track rail 1 has a bottom surface 1a to which a leg member is fixed, a top surface 1b, and a pair of left and right side surfaces 1c. An upper surface 1 b and a pair of left and right side surfaces 1 c of the track rail 1 are surrounded by a bowl-shaped moving block 2. On each of the pair of left and right side surfaces 1c of the track rail 1, a single ball rolling groove 4 extending in the longitudinal direction as a rolling element rolling groove is formed. The cross-sectional shape of the ball rolling groove 4 is a circular arc groove shape composed of a single arc. The radius of the circular arc groove shape is slightly larger than the radius of the ball 3.

  The moving block 2 is formed in a bowl shape as a whole and extends downward from the center portion 2a facing the top surface of the track rail 1 and both widthwise ends of the center portion 2a. And opposing side wall portions 2b. Further, end plates 5 as lid members are provided at both ends of the moving block 2 in the moving direction.

  FIG. 4 shows a cross-sectional view in a direction orthogonal to the track rail 1 of the motion guide device. In the moving block 2, a load ball rolling groove 7 is formed as a load rolling element rolling groove facing the ball rolling groove 4 of the track rail 1, and a ball return passage extending parallel to the load ball rolling groove 7. 8 is formed. Similarly to the ball rolling groove 4 of the track rail 1, the loaded ball rolling groove 7 is also formed in a circular arc groove shape composed of a single arc.

  FIG. 5 shows a cross-sectional view of the moving block 2 along the traveling direction. The moving block 2 includes a moving block main body 9 in which the load ball rolling groove 7 and the ball return passage 8 are formed, and a pair of end plates 5 attached to both ends of the moving block main body 9 in the moving direction. FIG. 5 shows a state in which the end plate 5 on one end side of the moving block body 9 is removed. An R piece portion 10 constituting an inner peripheral side of a U-shaped direction changing path connecting the loaded ball rolling groove 7 and the ball return passage 8 is integrally provided on the end surface of the moving block main body 9. As shown in the front view of FIG. 6, the outer peripheral side 11 of the direction changing path is formed on the end plates 5 attached to both ends of the moving block main body 9. A circuit-shaped ball circulation path is constituted by the loaded ball rolling groove 7, the ball return path 8, and the U-shaped direction change path. A large number of balls 3 are arranged and accommodated in the ball circulation path. A spacer for preventing contact between the balls 3 may be interposed between the balls 3.

  As shown in FIGS. 1 and 5, the moving block main body 9 is divided into two in the moving direction (the dividing plane is orthogonal to the moving direction). A plate-shaped intermediate rubber 17 is sandwiched between the two divided pieces 16. One divided piece 16 and the intermediate rubber 17 are coupled by a coupling means such as adhesion, and the other divided piece 16 and the intermediate rubber 17 are also coupled by a coupling means such as adhesion. However, one divided piece 16 and the other divided piece 16 are not joined. Therefore, one divided piece 16 can be slightly displaced in the direction perpendicular to the longitudinal direction of the track rail 1 with respect to the other divided piece 16. At this time, the intermediate rubber 17 interposed between the two divided pieces 16 undergoes shear deformation. Each of the two divided pieces 16 is processed with a mounting screw 18 for coupling to a moving body such as a table.

  When the moving block 2 is moved in the axial direction relative to the track rail 1, the ball 3 rolls while receiving a load on the load rolling path. The ball 3 that has rolled to one end of the loaded ball rolling groove 7 is guided into the direction change path, passes through the ball return path 8, and then returned from the opposite direction change path to the other end of the load ball rolling groove. .

  As shown in FIG. 1, the track rail 1 of the motion guide device of this embodiment is different from the track rail 1 of the conventional motion guide device, and penetrates the track rail 1 from the upper surface 1b toward the bottom surface 1a. The mounting hole (the mounting hole for mounting the track rail 1 to the counterpart part) is not processed. Instead, a rod-like leg member 12 protruding in a direction orthogonal to the longitudinal direction of the track rail 1 is welded to the bottom surface of the track rail 1. A plurality of leg members 12 are provided at a constant pitch in the longitudinal direction of the track rail 1. Each leg member 12 is elongated in a direction perpendicular to the longitudinal direction of the track rail 1. An upper surface 1 b and a pair of side surfaces 1 c of the track rail 1 are surrounded by a bowl-shaped moving block 2. However, the bottom surface 1 a of the track rail 1 is not surrounded by the moving block 2. Therefore, the bottom surface 1a of the track rail 1 is a position that does not prevent the movement block 2 from moving. One end of the leg member 12 is welded to the bottom surface 1 a of the track rail 1. A male screw for attaching the track rail 1 to the mating part is machined at the distal end portion 12a of the leg member 12.

  As shown in FIG. 4, if the mounting hole penetrating the track rail 1 is not machined into the track rail 1, the lateral width of the track rail 1 can be reduced, and between the track rail 1 and the moving block 2. The diameter of the interposed ball 3 can be increased. In this embodiment, the minimum value W1 of the distance between the left and right ball rolling grooves 4 formed on the left and right side surfaces of the track rail 1 is smaller than the diameter of the ball 3. And the diameter of the ball | bowl 3 is set to 60 to 90% of the thickness W2 of the track rail 1 whole.

  By narrowing the lateral width of the track rail 1, the track rail 1 itself is easily bent. Further, by increasing the diameter of the ball 3, the position of the contact point between the ball 3 and the ball rolling groove 4 and the position of the contact point between the ball 3 and the moving block 2 are likely to fluctuate. Moreover, as the diameter of the ball 3 increases, the allowable amount of compressive deformation also increases (even if the deformation amount is the same, the surface pressure increases with the small ball 3, but the surface pressure does not increase with the large ball 3). .

  From the viewpoint of bending the track rail 1, it is desirable to make the height of the track rail 1 as low as possible. According to the track rail 1 of the present embodiment, unlike the conventional track rail 1, it is not necessary to abut against the reference surface (see FIG. 13A) of the mating part. The height of the track rail 1 can be reduced by removing the abutting surface and making the track rail 1 the same shape even if the cross-sectional shape of the track rail 1 is turned upside down.

  FIG. 7A shows a side view of the track rail 1 before the leg member 12 is welded, and FIG. 7B shows a cross-sectional view. As described above, the ball rolling grooves 4 are formed on the left and right side surfaces of the track rail 1. On the bottom surface 1 a of the track rail 1, a built-up portion 15 having a circular arc cross section extending in the longitudinal direction of the track rail 1 is provided. The track rail 1 is quenched after the ball rolling groove 4 is formed.

  FIG. 8A shows a plan view of the leg member 12 welded to the track rail 1, and FIG. 8B shows a side view. The leg member 12 has a cylindrical shape, and a male screw is processed at the distal end portion 12a. A pair of flat surface portions 12b are formed at the base end portion of the leg member 12 with a part of the side surfaces being flattened. When attaching the track rail to the mating part, a tool such as a spanner is sandwiched between the pair of flat portions 12b. The end surface 12c of the leg member 12 is formed flat.

  The track rail 1 and the leg member 12 are projection welded. The built-up portion 15 of the track rail 1 and the end surface 12c of the leg member 12 are in line contact. Pressure is applied in a state where the build-up portion 15 on the bottom surface of the track rail 1 and the end surface 12c of the leg member 12 are in contact with each other, and an electric current is passed through them to generate resistance heat at the contact portion. The build-up portion 15 is melted by the resistance heat, and the track rail 1 and the leg member 12 are coupled.

  FIG. 9 shows another example of the track rail 1 and the leg member 12. As in this example, the bottom surface 1a of the track rail 1 may be a flat surface, and the end surface 12c of the leg member 12 may be formed in a spherical shape. In this case, the bottom surface 1a of the track rail 1 and the end surface 12c of the leg member 12 are in point contact.

  FIG. 10A shows an example in which the track rail 21 is attached to the mating component 19 using a conventional mounting method, and FIG. 10B shows that the track rail 1 is attached to the mating component 19 using the mounting method of the present embodiment. An example is shown. In the conventional mounting method, the bolt 22 is inserted into the counterbore 21 a of the track rail 21, and the bolt 22 is fastened to the female screw of the mating part 19. On the other hand, in the attachment method of this embodiment, first, the leg member 12 of the track rail 1 is inserted into the through hole 23 of the counterpart component 19. Next, the nut 24 is fastened to the screw of the leg member 12 from the back surface side of the mating component 19, and the mating component 19 is sandwiched between the bottom surface 1 a of the track rail 1 and the nut 24. Join.

  According to the attachment method of this embodiment, compared with the attachment method by the conventional volt | bolt, deformation | transformation of the leg member 12 in the through-hole 23 of the other component 19 can be anticipated. If the same moment is applied to the track rail 1, the axial force applied to the leg member 12 can be increased by narrowing the lateral width of the track rail 1. Therefore, the leg member 12 can be further deformed.

  FIG. 11 shows another example of a method for attaching the track rail 1 to the counterpart component 19. In this example, after the leg member 12 is inserted into the through hole 23 of the counterpart component 19, the welded portion 25 at the tip of the leg member 12 and the counterpart component 19 are welded from the back side of the counterpart component 19. As long as the cross-sectional shape of the leg member 12 is the same as the cross-sectional shape of the through-hole 23 of the counterpart part, it may be circular, square, or T-shaped.

  FIG. 12A shows a load distribution state of the ball 3 when the moment M is applied to the moving block 2 divided into two parts, and FIG. 12B shows a case where the moment M is applied to the undivided moving block 2. The load distribution state of the ball 3 is shown. When a moment is applied to the table 26, the moving block 2 is higher in rigidity than the table 26. Therefore, the table 26 is bent, but the moving block 2 can be considered to be a rigid body. As shown in FIG. 12B, when the moving block 2 is not divided, when the moment M acts on the moving block 2, an inclination angle is generated in the moving block 2, and the ball 3 is in a state of supporting the moment. The largest load is applied to the balls 3 positioned at both ends of the moving block 2 in the traveling direction, and the load received by the balls 3 located inside the moving block 2 is gradually reduced. The ball 3 in the vicinity of the center of the moving block 2 does not work effectively because it hardly applies a load.

  On the other hand, as shown in FIG. 12A, when the moving block 2 is divided into two in the traveling direction, when the moment M acts on the table 26, the two divided pieces 16 are displaced independently, and the two divided pieces 16 are separated. Each has an inclination angle. Compared to the case shown in FIG. 12B, the number of balls 3 that do not apply a load is reduced and the number of balls 3 that work effectively increases, so that the allowable moment of the moving block 2 can be increased.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention. For example, in order to make better use of the bending deformation of the track rail, the track rail may be attached to the counterpart component (with a gap between the track rail and the counterpart component). The present invention can also be applied to a so-called micro guide rail mounting method in which the rail has a lateral width of 3 mm or less and a mounting hole cannot be formed in the rail. Further, the present invention is not limited to the motion guide device having a moving block as a moving block, but can also be applied to a ball spline in which a slit extending in the axial direction is formed in the outer cylinder.

The perspective view of the exercise | movement guide apparatus in one Embodiment of this invention. Plan view of the motion guide device Side view of the motion guide device Sectional view in the direction orthogonal to the track rail of the motion guide device Sectional view along the direction of travel of the moving block Front view of end plate Side view of track rail Cross section of track rail Top view of leg members Side view of leg member The figure which shows the other example of a track rail and a leg member The figure which shows the example which attached the track rail to the other part using the conventional attachment method The figure which shows the example which attached the track rail to the other party component using the attachment method of this invention The figure which shows the other example of the method of attaching a track rail to a mating part Diagram showing the load distribution of a ball when a moment is applied to a moving block divided into two The figure which shows the load distribution state of a ball when a moment is applied to an unbroken moving block Process diagram showing how to attach conventional track rail to mating parts Process diagram showing how to attach conventional track rail to mating parts Process diagram showing how to attach conventional track rail to mating parts

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Track rail 1a ... Bottom surface 2 of track rail ... Moving block 2a ... Central part 2b ... Side wall part 3 ... Ball (rolling element)
4 ... Ball rolling groove (rolling element rolling groove)
7 ... Loaded ball rolling groove (Loaded rolling element rolling groove)
12 ... Leg member 12a ... Leg member tip 15 ... Overlaying portion 19 ... Counterpart 23 ... Through hole 24 ... Nut 25 ... Welded portion W1 ... Minimum distance between left and right ball rolling grooves

Claims (9)

A track rail formed with rolling element rolling grooves extending in the longitudinal direction, a moving block formed with a load rolling element rolling groove facing the rolling element rolling groove of the track rail, and the load of the moving block In a motion guide device comprising a plurality of rolling elements housed in a rolling element circulation path including rolling element rolling grooves,
A leg member that protrudes in a direction intersecting the longitudinal direction of the track rail is provided at a position that does not prevent the moving block from moving on the track rail,
A motion guide device characterized in that the track rail can be attached to a mating part using the leg member.   2. The mounting hole penetrating the track rail in a direction intersecting the longitudinal direction of the track rail for mounting the track rail to the mating part is not processed in the track rail. The motion guide device according to 1.   The leg member is processed with a screw for attaching the track rail to the mating part, or provided with a welded portion that is welded to the mating part when the track rail is attached to the mating part. The motion guide apparatus according to claim 1 or 2. The track rail has a bottom surface on which the leg members are provided, a top surface, and a pair of left and right side surfaces on which the rolling element rolling grooves are formed,
The moving block is formed in a bowl shape as a whole, and is provided at a center portion facing the upper surface of the track rail, and at both ends in the width direction of the center portion, and a pair of faces facing the left and right side surfaces of the track rail. A side wall, and
The rolling element is a ball,
And in the cross section in the direction orthogonal to the longitudinal direction of the track rail, the minimum value of the distance between the left and right rolling element rolling grooves formed on the left and right side surfaces of the track rail is smaller than the diameter of the ball. The motion guide apparatus according to any one of claims 1 to 3. The track rail is provided with a built-up portion having an arc-shaped cross section extending in the longitudinal direction of the track rail,
The motion guide device according to claim 1, wherein the leg member is projection welded or friction welded to the build-up portion of the track rail. A bottom surface of the track rail to which the leg member is attached is formed as a flat surface,
5. The motion guide device according to claim 1, wherein the leg member having a spherical end is projection welded or friction welded to the bottom surface of the track rail.   7. The leg member according to claim 1, wherein the leg member is elongated in a bar shape in a direction perpendicular to the longitudinal direction of the track rail, and a plurality of leg members are provided at a constant pitch in the longitudinal direction of the track rail. The motion guide device according to 1. A track rail formed with rolling element rolling grooves extending in the longitudinal direction, a moving block formed with a load rolling element rolling groove facing the rolling element rolling groove of the track rail, and the load of the moving block In a motion guide device comprising a plurality of rolling elements housed in a rolling element circulation path including rolling element rolling grooves,
The track rail has a bottom surface on which the leg members are provided, a top surface, and a pair of left and right side surfaces on which the rolling element rolling grooves are formed,
The moving block is formed in a bowl shape as a whole, and is provided at a center portion facing the upper surface of the track rail, and at both ends in the width direction of the center portion, and a pair of faces facing the left and right side surfaces of the track rail. A side wall, and
The rolling element is a ball,
And in the cross section in the direction orthogonal to the longitudinal direction of the track rail, the minimum value of the distance between the left and right rolling element rolling grooves formed on the left and right side surfaces of the track rail is smaller than the diameter of the ball. A motion guide device characterized by the above. A track rail formed with rolling element rolling grooves extending in the longitudinal direction, a moving block formed with a load rolling element rolling groove facing the rolling element rolling groove of the track rail, and the load of the moving block A plurality of rolling elements housed in a rolling element circulation path including rolling element rolling grooves, and a motion guide apparatus mounting method for attaching the track rail to a mating part.
A leg member that protrudes in a direction intersecting the longitudinal direction of the track rail at a position that does not prevent the movement block from moving is provided on the track rail, and the leg member is inserted into the through hole of the mating part. Insertion process;
A track rail coupling step of coupling the track rail to the mating component by tightening a nut to a screw processed into the leg member or welding a welded portion provided at a tip of the leg member to the mating component. And a mounting method of the motion guide device.

Images