WO2009107602A1

WO2009107602A1 - Motion device

Info

Publication number: WO2009107602A1
Application number: PCT/JP2009/053262
Authority: WO
Inventors: 廣昭望月
Original assignee: Thk株式会社
Priority date: 2008-02-28
Filing date: 2009-02-24
Publication date: 2009-09-03
Also published as: TW201002955A; JPWO2009107602A1; TWI438351B; JP5324559B2

Abstract

A motion device (10) which is provided with an extending track body (1), a moving body (2) relatively movable in a direction in which the track body (1) extends, and a plurality of rolling bodies (13) held by the moving body (2) to be used for the relative movement. The motion device (10) is characterized in that the moving body (2) comprises an inner casing member (16) provided with a convex spherical part (21) swelling toward a side opposite to the side of the track body (1) and an outer casing member (8) disposed on the side of the outer surface of the inner casing member (16) and provided with a concave spherical part (26) concaved corresponding to the convex spherical part (21), and in that a spherical bearing mechanism provided with the inner casing member (16) and the outer casing member (8) is formed.

Description

Exercise equipment

The present invention relates to a motion apparatus that relatively moves a moving body along an extending track body such as a linear motion guide, a ball spline, a ball bush, or a ball screw.
This application claims priority based on Japanese Patent Application No. 2008-047628 filed in Japan on February 28, 2008, the contents of which are incorporated herein by reference.

2. Description of the Related Art Conventionally, in machine tools, conveyors, and the like, motion devices such as linear guides, ball splines, ball bushes, or ball screws adapted to various applications are used to accurately feed and move workpieces and articles. .

For example, a linear motion guide disclosed in Patent Document 1 includes an extended rail-shaped track base (track body) and a substantially rectangular parallelepiped slider (movable body) that can be relatively moved in the extending direction of the track base. I have. Further, a plurality of balls (rolling elements) are disposed inside the slider, and an infinite circulation path for circulating these balls is formed. Then, these balls are interposed between the slider and the raceway and roll on the loaded rolling element rolling path, so that the slider and the raceway move relatively smoothly with low friction and low noise. Yes. A target member for movement is attached to the outer surface of the slider.

In addition, when the target member to be moved is relatively large or flat, for example, two sets of such linear motion guides are prepared and the rails are arranged in parallel in order to stabilize and accurately perform the motion. In some cases, the target member is integrally attached to both sliders.
JP 2007-285359 A

However, in such an exercise device, a moment load acting in the rolling, pitching, or yawing direction may be generated depending on the content of the movement of the target member, weight balance, mounting surface error, and the like. That is, in the linear motion guide of Patent Document 1, moment loads around the XYZ coordinate axes centering on the slider are generated, but most of these loads roll on the loaded rolling element rolling path and in this path. The ball will be loaded. In such a configuration, a plurality of balls of the moving body are locally overloaded, and the circulation of these balls may be hindered, and the movement itself may not be performed smoothly. In addition, due to such uneven overload on the inner surface of the ball and the loaded rolling element rolling path, scaly flaking occurs in these members, and cracks and breaks occur in the end plate that forms an infinite circuit. Or the member may be damaged.

Also, as described above, when two sets of linear motion guides are used and the rails are arranged in parallel, it is necessary to accurately determine the relative positional relationship between the sliders. However, if this accuracy cannot be ensured, an excessive moment load is generated in the exercise device. In other words, when both sliders and the target member are mounted together by, for example, screwing, the sliders are twisted due to slight errors in the height and inclination of the mounting parts, resulting in an excessive moment load. However, a load is applied to the apparatus.

In recent years, there has been a demand for further downsizing of the exercise device in order to reduce the outer shape of various devices incorporating the exercise device to save space.

The present invention has been made in view of such problems, and removes all the moment loads in the rolling, pitching and yawing directions that act on the apparatus and makes the ball (rolling element) load uniform, thereby improving rigidity and durability. The object is to provide a high exercise device.

In order to achieve the above object, the present invention proposes the following means.
That is, the present invention provides a motion comprising: an extending track body; a moving body that is relatively movable in the extending direction of the track body; and a plurality of rolling elements that are held by the moving body and used for the relative movement. The moving body is an inner casing member provided with a convex spherical portion that bulges toward the opposite side to the track body side, and is disposed on the outer surface side of the inner casing member and the convex spherical portion. And a spherical bearing mechanism including the inner casing member and the outer casing member is formed.

According to the exercise device according to the present invention, the moving body is formed with the spherical bearing mechanism having the convex spherical portion of the inner casing member and the concave spherical portion of the outer casing member. When a moment load in the direction is applied, the inner casing member and the outer casing member slide relative to each other to remove the load on the apparatus due to the moment load. Therefore, the exercise device is prevented from being damaged, and the exercise is performed stably and smoothly over a long period of time.

In addition, when a plurality of exercise devices are arranged and a target member to be moved is integrally fixed to a plurality of moving bodies, even if there are some errors in the height and inclination state of the fixed portions of these moving bodies, When tightening stress or the like is applied during fixing, the inner casing member and outer casing member gradually slide relative to each other due to the stress, and are automatically aligned so as to correct each other's twist. ing. Therefore, unlike the conventional case, it is not necessary for the operator to be skilled in order to adjust the mounting position and determine the accuracy, and it is not necessary to perform troublesome work that requires a long time, and the workability of installation is dramatically improved. . In addition, since it can be installed roughly without requiring relatively high accuracy in this way, the degree of freedom of attachment of the device is increased, and it is possible to meet various demands.

According to the exercise device according to the present invention, all the moment loads in the rolling, pitching and yawing directions acting on the device are removed, the load on the rolling elements is made uniform, and the rigidity and durability are improved.

1 is a partially transparent perspective view showing a schematic configuration of a linear guide as an exercise device according to a first embodiment of the present invention. It is sectional drawing which shows schematic structure of the linear motion guide as an exercise | movement apparatus of the 1st Embodiment of this invention. It is sectional drawing which shows schematic structure of the linear guide as an exercise device of the 2nd Embodiment of this invention. It is sectional drawing which shows schematic structure of the ball screw as an exercise | movement apparatus of the 3rd Embodiment of this invention. It is sectional drawing which shows schematic structure of the linear guide as an exercise | movement apparatus of the 4th Embodiment of this invention. It is sectional drawing which shows schematic structure of the linear guide as an exercise | movement apparatus of the 5th Embodiment of this invention. It is a figure explaining the rolling resistance test of a linear guide. It is a graph which shows the result of the rolling resistance test of FIG.

Explanation of symbols

DESCRIPTION OF

SYMBOLS

1,31 ... Raceway (track body), 2, 32, 62, 82, 102 ... Slider (moving body), 8, 58, 88, 108 ... Outer casing member, 10, 30, 80, 100 ... Linear motion guide (Exercise device), 12, 72 ... loaded rolling element rolling path, 13 ... ball (rolling element), 16, 36, 86, 106 ... inner casing member, 17, 87 ... first convex spherical surface (convex spherical surface), 18 ... 2nd convex spherical surface (convex spherical surface), 20, 37 ... 3rd convex spherical surface (convex spherical surface), 21, 41, 91, 111 ... convex spherical surface portion, 22, 99B, 112A ... 1st concave spherical surface (concave spherical surface), 23 2nd concave spherical surface (concave spherical surface), 25, 47, 98A, 113A ... 3rd concave spherical surface (concave spherical surface), 26, 46, 96, 118 ... concave spherical surface portion, 38 ... 4th convex spherical surface (convex spherical surface), 48 ... 4th concave spherical surface (concave spherical surface), 60 ... ball (Exercise device), 61 ... Orbital axis (orbital body), 96A, 96B ... Plug (concave spherical surface), 107 ... Fifth convex spherical surface (convex spherical surface), 114A ... Fifth concave spherical surface (concave spherical surface), P ... Center point

Hereinafter, an exercise device according to a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a partially transparent perspective view showing a schematic configuration of a linear motion guide as an exercise device according to the first embodiment of the present invention. FIG. 2 is an outline of the linear motion guide as an exercise device according to the first embodiment of the present invention. It is sectional drawing which shows a structure.

As shown in FIG. 1, the linear motion guide 10 as the exercise device of the first embodiment has a rail-shaped track (track body) 1 extending in the horizontal direction. A plurality of grooved rolling element rolling surfaces 1 a extending along the rail 1 are formed on the outer periphery. Further, a slider (moving body) 2 capable of relative movement in the extending direction of the rail 1 is provided above the rail 1 (upper side in FIG. 1).

The slider 2 has a substantially rectangular parallelepiped slider main body 3 and a substantially flat end plate 4 sandwiching the slider main body 3 from both sides in the extending direction of the track base 1 on which the slider main body 3 moves. Above the slider main body 3, a substantially rectangular plate-like upper outer casing member 5 extending in the horizontal direction perpendicular to the extending direction of the rail 1 is disposed, and the side of the slider main body 3 (see FIG. 1 is provided with a substantially rectangular plate-shaped side outer casing member 6 extending in the vertical direction.

Further, the upper outer casing member 5 and the lateral outer casing member 6 are integrally fixed by using a plurality of bolts 7 to form an outer casing member 8 having a substantially π shape in front view. Also, a plurality of through holes 9 penetrating in the vertical direction are formed in the vicinity of both ends of the upper outer casing member 5, and a target member that moves to the upper surface portion by a bolt or the like (not shown) using these through holes 9. It can be attached.

Further, as shown in FIG. 2, an opening is provided below the slider body 3 (lower side in FIG. 2) so as to cover the upper side of the rail platform 1 (upper side in FIG. 2). A concave recess 3a formed along the direction is provided. Further, in the recess 3a, a grooved load rolling element rolling surface 11 is formed at a position facing the rolling element rolling surface 1a of the rail 1 respectively.

Further, a space formed by the rolling element rolling surface 1a of the way 1 and the loaded rolling element rolling surface 11 disposed to face the rolling element rolling surface 1a is defined as a loaded rolling element rolling path 12. The load rolling element rolling path 12 is filled with a plurality of balls (rolling elements) 13. These load rolling element rolling paths 12 form a part of a plurality of infinite circulation paths (not shown) each having a substantially elliptical ring shape or circuit shape provided in the slider 2, and the balls 13 are formed in the paths of the infinite circulation paths. It is supposed to be free to circulate. And the way 1 and the slider 2 are fitted through these balls 13 so that they can move relative to each other. That is, the rail 1 and the slider 2 can be moved relative to each other by rolling and circulation of the ball 13.

Further, a substantially disc-shaped upper inner casing member 14 is disposed on the upper surface portion of the slider body 3. Further, a substantially disc-shaped side inner casing member 15 is disposed on both side surface portions (left and right side surface portions in FIG. 2) of the slider main body 3, and these upper inner casing member 14 and side inner casing member are arranged. An inner casing member 16 made of 15 is formed. Further, the inner casing member 16 is formed integrally with the slider body 3.

Further, a first convex spherical surface (convex spherical surface) 17 formed of a part of a spherical surface that bulges or protrudes toward the side opposite to the way 1 side is formed at a substantially central portion of the upper inner casing member 14. A ring-shaped second convex spherical surface (convex spherical surface) 18 is provided so as to surround the first convex spherical surface 17 in the horizontal direction. The second convex spherical surface 18 is substantially the same as the center point P of the spherical surface of the first convex spherical surface 17, and from a part of the spherical surface having a radius D 2 larger than the radius D 1 of the first convex spherical surface 17. Is formed. Here, “substantially the same center” includes a state where the centers of oppositely arranged spherical surfaces, which will be described later, are slightly shifted from each other so that they can be relatively slid.

The first convex spherical surface 17 and the second convex spherical surface 18 are connected to each other by a surface 19 formed along the radial direction of these convex spherical surfaces.
Each of the side

inner casing members

15 and 15 is formed with a third convex spherical surface (convex spherical surface) 20 formed of a part of a spherical surface that bulges or projects toward the side opposite to the way 1 side. . The center of the spherical surface of the third convex spherical surface 20 is set substantially the same as the center point P, and the radius D3 of the third convex spherical surface 20 is set to a value different from the radii D1 and D2. A convex spherical surface portion 21 formed by combining a plurality of convex spherical surfaces including the first convex spherical surface 17, the second convex spherical surface 18, and the third convex spherical surface 20 is formed.

In addition, the upper outer casing member 5 of the outer casing member 8 is opposed to a position corresponding to the first convex spherical surface 17 of the inner casing member 16 and has a spherical surface that is recessed or falls toward the side opposite to the way 1 side. A first concave spherical surface (concave spherical surface) 22 is formed, and the first convex spherical surface 17 and the first concave spherical surface 22 are slidably disposed so as to be relatively slidable along each spherical surface. Has been.

That is, the first concave spherical surface 22 is set to have substantially the same radius as the radius D1 of the first convex spherical surface 17, and the center of the spherical surface is substantially the same as the center point P. A lubricating film (not shown) made of self-lubricating fluororesin, molybdenum disulfide, graphite or the like is formed on at least one surface where the spherical surface 17 and the first concave spherical surface 22 are in sliding contact with each other. Slide to move to.

Further, the upper outer casing member 5 is disposed opposite to the second convex spherical surface 18 of the inner casing member 16 and surrounds the first concave spherical surface 22 in the horizontal direction so as to surround the ring-shaped second concave spherical surface (concave spherical surface). 23 is provided. The second concave spherical surface 23 has the center of the spherical surface substantially the same as the center point P, and is set to be substantially the same radius as the radius D2 of the second convex spherical surface 18. The second concave spherical surface 23 is slidably disposed so as to be relatively slidable along the respective spherical surfaces. That is, the lubricating film is also formed on at least one of the surfaces where the second convex spherical surface 18 and the second concave spherical surface 23 are in sliding contact.

The first concave spherical surface 22 and the second concave spherical surface 23 are connected to each other by a surface 24 formed along the radial direction of these concave spherical surfaces.
Further, the surface 19 of the inner casing member 16 and the surface 24 of the outer casing member 8 are arranged to be opposed to each other at a distance from each other, and the inner casing member 16 and the outer surface are separated by a gap provided between these

surfaces

19 and 24. The casing member 8 is relatively slidable and swingable.

Further, the lateral

outer casing members

6 and 6 are arranged so as to face the third convex spherical surfaces 20 of the lateral

inner casing members

15 and 15, and are spherical surfaces that are recessed or fallen toward the side opposite to the way 1 side. A third concave spherical surface (concave spherical surface) 25 is formed. The center of the spherical surface of the third concave spherical surface 25 is also substantially the same as the center point P, and is set to substantially the same radius as the radius D3 of the third convex spherical surface 20. The three concave spherical surfaces 25 are arranged in sliding contact with each other so as to be relatively slidable along the spherical surfaces. That is, the lubricating film is also formed on at least one of the surfaces where the third convex spherical surface 20 and the third concave spherical surface 25 are in sliding contact.

A concave spherical surface portion 26 is formed by combining a plurality of concave spherical surfaces including the first concave spherical surface 22, the second concave spherical surface 23, and the third concave spherical surface 25.
Further, in this way, a spherical bearing mechanism that includes the convex spherical surface portion 21 of the inner casing member 16 and the concave spherical surface portion 26 of the outer casing member 8 and that substantially has the center point P as the center is formed.

Further, a central axis formed by extending a central position at an equal distance from the plurality of load rolling element rolling paths 12 along the way 1 is arranged so as to overlap the central point P of the spherical bearing mechanism. That is, the radius D4 of the distance from the center point P to the center of each loaded rolling element rolling path 12 is set to the same dimension.

Next, the operation of the linear motion guide 10 of the first embodiment will be described.
When a target member to be moved is attached to the upper surface portion of the upper outer casing member 5 of the slider 2 or the target member is moved by moving the linear guide 10, the weight balance of the target member and the content of the motion Depending on the type, a moment load about the XYZ coordinate axes is generated in the slider 2 portion of the linear motion guide 10. That is, a moment load is generated in the rolling direction P around the X axis around the slider 2 in FIG. 1, the pitching direction Q around the Y axis, or the yawing direction R around the Z axis.

When a moment load in the rolling direction P, the pitching direction Q or the yawing direction R is generated on the slider 2 of the linear guide 10 in this way, the outer casing member 8 of the spherical bearing mechanism is applied to the moment load in any direction. However, it slides along the spherical surface of the inner casing member 16 so as to rotate about the center point P.

As described above, according to the linear motion guide 10 of the first embodiment, the slider 2 has a spherical bearing mechanism having the convex spherical portion 21 of the inner casing member 16 and the concave spherical portion 26 of the outer casing member 8. Therefore, when a moment load in the rolling, pitching or yawing direction is applied to the linear motion guide 10, the inner casing member 16 and the outer casing member 8 slide relative to each other to remove the moment load. The load on the apparatus due to the moment load is suppressed. Therefore, the linear motion guide 10 is prevented from being damaged, and the motion is stably and smoothly performed over a long period of time.

Further, when a plurality of linear motion guides 10 are arranged and used with the target member to be moved integrally fixed to the plurality of sliders 2, the height of the portion of the slider 2 to which the target member is fixed and the state of inclination are somewhat different. Even if there is an error (mounting surface error), when a tightening stress or the like is applied for fixing, the inner casing member 16 and the outer casing member 8 gradually slide relative to each other to correct each other's twist. It will be automatically aligned as you do.

Therefore, unlike the prior art, there is no need for the operator to be skilled in order to determine the relative mounting position of the linear motion guide 10 with high accuracy, and it is not necessary to perform a troublesome work that requires a long time. Sexually improves. In addition, since the apparatus can be installed roughly without requiring relatively high accuracy in this way, the degree of freedom in mounting the apparatus is increased, and various demands can be met.

The centers of the plurality of convex

spherical surfaces

17, 18, and 20 of the convex spherical portion 21 of the inner casing member 16 are set to substantially the same center point P, and the concave spherical portion 26 of the outer casing member 8 Since the plurality of concave

spherical surfaces

22, 23, and 25 are opposed to each other at positions corresponding to the convex

spherical surfaces

17, 18, and 20, and each center is set at the center point P, the inner casing member 16 is the outer casing member. 8 is swingable.

In addition, according to the configuration in which the spherical surfaces are used in combination as described above, the thickness dimension of the portion where the convex spherical surface portion 21 and the concave spherical surface portion 26 are formed can be made thinner and flat and space-saving. The thickness dimension indicates a dimension in a substantially vertical direction (vertical direction in FIG. 2) orthogonal to a substantially horizontal direction (horizontal direction in FIG. 2) in which the first convex spherical surface 17 and the second convex spherical surface 18 are arranged. ing. Therefore, the external dimensions of the slider 2, particularly the external shape in the height direction (the vertical direction in FIGS. 1 and 2) can be reduced, and the degree of freedom of installation is increased.

Further, by variously setting a plurality of spherical surfaces constituting the convex spherical surface portion 21 and the concave spherical surface portion 26, the load resistance setting for the radial load and the thrust load applied to the slider 2 can be variously adjusted. Further, the gap between the surface 19 of the inner casing member 16 and the surface 24 of the outer casing member 8 can be set variously, and the limit range of sliding movement between the inner casing member 16 and the outer casing member 8 can be set. it can.

Further, the spherical center point P of the spherical bearing mechanism of the slider 2 is overlapped on a central axis set at the same distance from the plurality of load rolling element rolling paths 12, and the plurality of balls 13 are equally spaced from the central axis. The load rolling element rolling path 12 is arranged so that when a moment load is applied to the linear motion guide 10, the load applied to the ball 13 and the load rolling element rolling path 12 is distributed substantially evenly. Dispersed to prevent local overload on each member. Accordingly, damage to members such as the ball 13, the rolling element rolling surface 1a, the loaded rolling element rolling surface 11, and the end plate 4 is prevented, and the strength of the linear guide 10 is increased and the durability is improved.

Further, even when a load in the directions of the radii D1, D2, and D3 in FIG. 2 and a thrust load in the extending direction of the rail 1 are applied to the linear motion guide 10, the sliding between the convex spherical surface portion 21 and the concave spherical surface portion 26 occurs. Since the contact area is sufficiently secured, the strength is secured.

Next, an exercise device according to a second embodiment of the present invention will be described.
FIG. 3 is a cross-sectional view showing a schematic configuration of a linear guide as an exercise device according to a second embodiment of the present invention.
Note that the same members as those of the linear motion guide 10 of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

As shown in FIG. 3, the linear motion guide 30 as the exercise device of the second embodiment has a horizontal width that is perpendicular to the extending direction of the raceway (track body) 31 than the linear motion guide 10 described above. Is set too narrow. Further, the concave portion 33 a of the slider main body 33 of the slider 32 is also formed narrow so as to correspond to the width of the track 31. A plurality of load rolling element rolling paths 12 are provided between the outer periphery of the rail 31 and the recess 33a of the slider body 33, and an infinite circulation path (not shown) having each of the load rolling element rolling paths 12 is a slider. Each of these balls is formed in the main body 33, and a plurality of balls 13 are arranged and filled in these infinite circulation paths.

Further, a substantially disk-shaped upper inner casing member 14 is disposed on the upper surface portion of the slider main body 33. Further, a substantially disc-shaped side inner casing member 35 is disposed on each side surface portion of the slider body 33, and an inner casing member 36 composed of the upper inner casing member 14 and the side inner casing member 35 is provided. Is formed. Further, the inner casing member 36 is formed integrally with the slider body 33.

Further, a third convex spherical surface (convex spherical surface) formed of a part of a spherical surface that bulges or protrudes toward the opposite side to the side of the track 31 at the substantially central portion in the vertical direction of each of the side inner casing members 35, 35. ) 37 is formed. Further, ring-shaped fourth convex spherical surfaces (convex spherical surfaces) 38 are respectively provided so as to surround the third convex spherical surface 37 in the vertical direction. The fourth convex spherical surface 38 is substantially the same as the center point P of the spherical surface of the third convex spherical surface 37, and is part of a spherical surface having a radius D 34 larger than the radius D 33 of the third convex spherical surface 37. Is formed. The third convex spherical surface 37 and the fourth convex spherical surface 38 are connected to each other by a surface 39 formed along the radial direction of these convex spherical surfaces.
A convex spherical surface portion 41 is formed by combining a plurality of convex spherical surfaces including the first convex spherical surface 17, the second convex spherical surface 18, the third convex spherical surface 37, and the fourth convex spherical surface 38.

Further, the

side casing members

56, 56 of the outer casing member 58 are respectively disposed opposite to the positions corresponding to the third convex spherical surface 37 of the inner casing member 36, and are recessed toward the side opposite to the way 31 side. Alternatively, a third concave spherical surface (concave spherical surface) 47 formed of a part of the falling spherical surface is formed, and the third convex spherical surface 37 and the third concave spherical surface 47 can be relatively slid along the spherical surfaces. It is arranged in sliding contact.

That is, the third concave spherical surface 47 is set to have substantially the same radius as the radius D33 of the third convex spherical surface 37, and the center is substantially the same as the center point P. A lubricant film (not shown) having a self-lubricating property is formed on at least one surface with which the third concave spherical surface 47 is slidably contacted, and is slid smoothly with respect to each other.

Further, the side

outer casing members

56, 56 are arranged to face the fourth convex spherical surface 38 of the inner casing member 36, and surround the third concave spherical surface 47 in the vertical direction so that the ring-shaped fourth concave spherical surface ( (Concave spherical surface) 48 is provided. The fourth concave spherical surface 48 has the center of the spherical surface substantially the same as the center point P, and is set to substantially the same radius as the radius D34 of the fourth convex spherical surface 38. The fourth concave spherical surface 48 is disposed so as to be slidable so as to be relatively slidable along the respective spherical surfaces. That is, the lubricating film is also formed on at least one of the surfaces where the fourth convex spherical surface 38 and the fourth concave spherical surface 48 are in sliding contact.

The third concave spherical surface 47 and the fourth concave spherical surface 48 are connected to each other by a surface 49 formed along the radial direction of these concave spherical surfaces.
Further, the surface 39 of the inner casing member 36 and the surface 49 of the outer casing member 58 are disposed to face each other while being spaced apart from each other. The casing member 58 is relatively slidable and swingable.

A concave spherical portion 46 formed by combining a plurality of concave spherical surfaces including the first concave spherical surface 22, the second concave spherical surface 23, the third concave spherical surface 47, and the fourth concave spherical surface 48 is formed.
Further, in this way, a spherical bearing mechanism that includes the convex spherical surface portion 41 of the inner casing member 36 and the concave spherical surface portion 46 of the outer casing member 58 and that substantially has the center point P as the center is formed.

As described above, according to the linear motion guide 30 of the second embodiment, the same effects as those of the linear motion guide 10 of the first embodiment are achieved, and the following effects are achieved. That is, the convex

spherical surfaces

37, 38 of the side

inner casing members

35, 35 and the concave

spherical surfaces

47, 48 of the side

outer casing members

56, 56 are arranged to face each other to form a composite spherical structure. Since the contact area is sufficiently secured, the moment load applied to the linear motion guide 30 can be more reliably removed, and the strength against the radial load and the thrust load can be further improved.

In addition, according to the configuration in which the spherical surfaces are used in combination as described above, the thickness dimensions of the portions where the convex

spherical surfaces

37 and 38 and the concave

spherical surfaces

47 and 48 are formed can be made thinner and flat and space-saving. The thickness dimension indicates a dimension in a substantially horizontal direction (left and right direction in FIG. 3) orthogonal to a substantially vertical direction (vertical direction in FIG. 3) in which the third convex spherical surface 37 and the fourth convex spherical surface 38 are arranged. ing. Therefore, the thickness of the side outer casing member 56 can be reduced and formed thinner, and the outer shape of the apparatus is reduced.

Next, an exercise device according to a third embodiment of the present invention will be described.
FIG. 4 is a cross-sectional view showing a schematic configuration of a ball screw as an exercise device according to a third embodiment of the present invention.
The same members as those of the linear motion guides 10 and 30 of the first and second embodiments described above are denoted by the same reference numerals and the description thereof is omitted.

As shown in FIG. 4, the ball screw 60 as the exercise device of the third embodiment has a round bar-like or pipe-like raceway shaft (track body) 61 extending in the horizontal direction. On the outer periphery of 61, there is provided a grooved rolling element rolling surface 61 a formed in a spiral shape around the central axis of the track shaft 61. In addition, a slider (moving body) 62 is provided that penetrates the track shaft 61 in the central axis direction and is relatively movable in the central axis direction.

The slider 62 includes a substantially rectangular parallelepiped slider main body 63, and the slider main body 63 is formed with a hole 63a through which the track shaft 61 is inserted and penetrates in the central axis direction. Moreover, in the position which opposes the rolling-element rolling surface 61a of the internal peripheral surface of the hole 63a, the grooved load rolling-element rolling surface formed in a spiral shape corresponding to this rolling-element rolling surface 61a is provided. 71 is provided.

In addition, a space formed by the rolling element rolling surface 61 a of the track shaft 61 and the loaded rolling element rolling surface 71 disposed to face the rolling element rolling surface 61 a is defined as a loaded rolling element rolling path 72. The load rolling element rolling path 72 is filled with a plurality of balls (not shown). The load rolling element rolling path 72 forms a part of an infinite circulation path (not shown) provided in the slider 62, and the ball can freely circulate in the path of the infinite circulation path. The track shaft 61 and the slider 62 are fitted with each other via the balls so as to be able to move relative to each other. That is, the track shaft 61 and the slider 62 can be relatively moved along the axial direction and the circumferential direction around the axis by rolling and circulation of the ball.

Further, the center axis of the track shaft 61 overlaps the center point P of the spherical bearing mechanism composed of the inner casing member 16 and the outer casing member 8. That is, the radius D74, which is the distance from the center point P to the center of the loaded rolling element rolling path 72 shown by the alternate long and short dash line in FIG. 4, is set to have the same dimension in all the radial directions around the center axis. ing.

As described above, according to the ball screw 60 of the third embodiment, the same effect as that of the linear guide 10 of the first embodiment is achieved, and the spherical center point P of the spherical bearing mechanism of the slider 62 is achieved. Are set so as to overlap the central axis of the track shaft 61, and a plurality of balls are arranged in the load rolling element rolling path 72 at an equal distance from the central axis, so that a moment load is applied to the ball screw 60. In this case, the load applied to the ball and the inner surface of the load rolling element rolling path 72 is distributed so as to be distributed substantially evenly, so that a local overload is not applied to the member. Therefore, damage to the member is prevented, the strength of the ball screw 60 is increased, and durability is improved.

Next, an exercise device according to a fourth embodiment of the present invention will be described.
FIG. 5: is sectional drawing which shows schematic structure of the linear motion guide as an exercise | movement apparatus of the 4th Embodiment of this invention.
The same members as those described in the first to third embodiments are denoted by the same reference numerals, and the description thereof is omitted.

As shown in FIG. 5, the linear motion guide 80 as the exercise device of the fourth embodiment has a slider (moving body) 82 disposed above the track base 1 (upper side in FIG. 5). . The slider 82 is movable along the extending direction with respect to the rail 1.

The slider 82 includes an outer casing member 88 having a substantially C-shaped cross section orthogonal to the extending direction, and a slider main body 83 disposed inside the outer casing member 88 and having a substantially C-shaped cross section. Have. Further, an inner casing member 86 having a plurality of convex spherical surfaces is formed integrally with the slider main body 83 on the outer peripheral surface of the slider main body 83.

Specifically, side inner casing members 15 are formed on portions of the outer peripheral surface of the slider main body 83 facing the outer side in the horizontal direction orthogonal to the extending direction, respectively. The outer surface is a third convex spherical surface 20. The distance between the tops of the third convex spherical surfaces 20 facing outward in the horizontal direction is greater than the distance between the inner wall surfaces facing inward of the horizontal direction at the lower end opening edge of the outer casing member 88. It is set slightly smaller.

Further, an upper inner casing member 84 having a substantially disc shape is formed on a portion of the outer peripheral surface of the slider main body 83 facing upward in the vertical direction orthogonal to the extending direction. The upper inner casing member 84 is formed so as to bulge or protrude from the upper surface of the slider body 83, and has a shape in which a part of a sphere is cut away. The outer surface of the upper inner casing member 84 is a first convex spherical surface (convex spherical surface) 87. The center of the first convex spherical surface 87 is set to the center point P substantially. In the illustrated example, the radius D 81 of the first convex spherical surface 87 is set to a value smaller than the radius D 3 of the third convex spherical surface 20.

As described above, the inner casing member 86 includes the upper inner casing member 84 and the side inner casing member 15, and the inner casing member 86 has a convex spherical surface portion 91 including the first convex spherical surface 87 and the third convex spherical surface 20. Is formed.

The outer casing member 88 is formed with a plurality of screw holes penetrating the outer casing member 88 in a direction perpendicular to the extending direction. Specifically, the outer casing member 88 passes through the outer casing member 88 along a horizontal direction orthogonal to the extending direction, and a pair of screw holes 88A in which an inner peripheral surface is machined, A screw hole 88B that penetrates the outer casing member 88 along a vertical direction orthogonal to the extending direction and is internally threaded is formed.

Further, in the screw hole 88 A, portions that open to the slide body 83 side are respectively arranged corresponding to the third convex spherical surface 20 of the side inner casing member 15. In addition, a portion of the screw hole 88 B that opens toward the slide main body 83 is disposed corresponding to the first convex spherical surface 87 of the upper inner casing member 84.

Also, the concave spherical portion 96 is fitted into the screw holes 88A and 88B of the outer casing member 88 by a screw action. That is, the screw holes 88A are formed in a columnar shape, and plugs 96A each having a male thread processed on its outer peripheral surface are fitted into each other by a screw action. The plugs 96 B that have been threaded are fitted together by a screw action, and these plugs 96 A and 96 B serve as a concave spherical surface portion 96. Moreover, these

plugs

96A and 96B can be attached to and detached from the screw holes 88A and 88B.

These plugs 96A have a third concave spherical surface (concave spherical surface) 98A facing the third convex spherical surface 20 side. The third concave spherical surface 98A has the center point P substantially at the center thereof, and has a radius substantially the same as the radius D3 of the third convex spherical surface 20. Further, the third concave spherical surface 98A and the third convex spherical surface 20 are in contact with each other, and are relatively slidable along the spherical surface direction.

Specifically, a recess 97A is formed on the surface facing the inner side in the horizontal direction of the plug 96A, and a sliding material 98 made of, for example, a fluororesin is accommodated in the recess 97A. The surface of the sliding member 98 facing the third convex spherical surface 20 is the third concave spherical surface 98A.

Further, tool holes 97C for inserting a tip of a tool or the like and tightening or loosening the plug 96A with respect to the screw hole 88A are formed on the surface of the plug 96A facing the outside in the horizontal direction. That is, with the tool or the like inserted in the tool hole 97C, the plug 96A is rotated about its axis, so that the third concave spherical surface 98A of the plug 96A is changed to the third convex spherical surface 20 of the side inner casing member 15. On the other hand, it is possible to advance and retreat.

The surface of the plug 96B facing the first convex spherical surface 87 is a first concave spherical surface (concave spherical surface) 99B. The first concave spherical surface 99B has a center point P substantially set at the center thereof, and has a radius substantially the same as the radius D81 of the first convex spherical surface 87. Further, the first concave spherical surface 99B and the first convex spherical surface 87 are in contact with each other, and are relatively slidable along the spherical surface direction.

Specifically, a concave portion 97B is formed on the surface of the plug 96B facing downward in the vertical direction, and a sliding material 99 made of, for example, a fluororesin is accommodated in the concave portion 97B. The surface of the sliding member 99 that faces the first convex spherical surface 87 is the first concave spherical surface 99B.

Further, a tool hole 97D for inserting a tip of a tool or the like and tightening or loosening the plug 96B with respect to the screw hole 88B is formed on the surface of the plug 96B facing upward in the vertical direction. That is, with the tool or the like inserted in the tool hole 97D, the first concave spherical surface 99B of the plug 96B is rotated with respect to the first convex spherical surface 87 of the upper inner casing member 84 by rotating the plug 96B around its axis. It is possible to advance and retreat.

As described above, the plugs 96 A and 96 B of the concave spherical surface portion 96 can advance and retreat toward the third convex spherical surface 20 and the first convex spherical surface 87 of the convex spherical surface portion 91, respectively.
In addition, a spherical bearing mechanism is formed which includes the convex spherical surface portion 91 of the inner casing member 86 and the concave spherical surface portion 96 of the outer casing member 88 and substantially has the center point P as the center.

As described above, according to the linear motion guide 80 of the fourth embodiment, the concave spherical portion 96 of the outer casing member 88 can be advanced and retracted toward the convex spherical portion 91 of the inner casing member 86. The relative positions of the concave spherical portion 96 and the convex spherical portion 91 can be adjusted, and the spherical bearing mechanism can be operated with higher accuracy. Therefore, the moment load acting on the linear motion guide 80 can be reliably removed, and the motion of the linear motion guide 80 is stably performed.

Further, since the

plugs

96A and 96B of the concave spherical surface portion 96 are fitted into the screw holes 88A and 88B of the outer casing member 88 by screwing, respectively, the above-mentioned concave spherical surface portion 96 is loosened or tightened. Can advance and retreat with respect to the convex spherical surface portion 91 easily and accurately.

In particular, since the plug 96A can be tightened toward the inner side in the horizontal direction with respect to the side inner casing member 15, the linear motion guide 80 ensures rigidity against a load.

Further, since the

plugs

96A and 96B are detachable from the screw holes 88A and 88B, the slider 82 can be assembled relatively easily. That is, at the time of assembly, first, an outer casing member 88 with the

plugs

96A and 96B removed is prepared, and the outer casing member 88 is put on the slider body 83 from above, and then the

plugs

96A and 96B are screwed into the screw holes 88A, It can be screwed into 88B. Note that the plug 96B may be assembled while being attached to the outer casing member 88. In this way, by attaching the

plugs

96A and 96B to the outer casing member 88, the spherical bearing mechanism can be easily and accurately formed.

The

plugs

96A and 96B may be attached to the outer casing member 88 and fixed so that the

plugs

96A and 96B do not advance and retract with respect to the outer casing member 88 in a state in which the above-described advance / retreat is adjusted. That is, for example, an adhesive or a pinning mechanism may be used to prevent the

plugs

96A and 96B from rotating, and in this case, the

plugs

96A and 96B may be restricted from moving forward and backward. In this case, the

plugs

96A and 96B and the screw holes 88A may be restricted. , 88B, and the fitting state by the screw action is stable and no fluctuation occurs, so that the spherical bearing mechanism operates stably and accurately over a long period of time.

In the present embodiment, the outer casing member 88 has a substantially C-shaped cross section as described above, and is integrally formed so as to cover the outside of the slider body 83. Is sufficiently secured. Specifically, the outer casing member 88 is not formed by a plurality of members including the upper outer casing member 5 and the pair of side outer casing members 6 as in the above-described embodiment, but is formed by a single member. Therefore, the manufacturing is relatively easy and the mechanical strength is sufficiently secured.

Next, an exercise device according to a fifth embodiment of the present invention will be described.
FIG. 6 is a sectional view showing a schematic configuration of a linear guide as an exercise device according to a fifth embodiment of the present invention.
The same members as those described in the first to fourth embodiments are denoted by the same reference numerals, and the description thereof is omitted.

As shown in FIG. 6, the linear motion guide 100 as the exercise device of the fifth embodiment has a slider (moving body) 102 disposed above the track base 1 (upper side in FIG. 6). . Further, the slider 102 is movable along the extending direction with respect to the rail platform 1.

The slider 102 includes an outer casing member 108 having a substantially C-shaped cross section orthogonal to the extending direction, and a slider main body 103 disposed inside the outer casing member 108 and having a substantially C-shaped cross section. Have. An inner casing member 106 having a plurality of convex spherical surfaces is formed integrally with the slider main body 103 on the outer peripheral surface of the slider main body 103.

Specifically, side inner casing members 15 are respectively formed on the outer peripheral surface of the slider main body 103 at portions facing the outer side in the horizontal direction perpendicular to the extending direction. The outer surface is a third convex spherical surface 20.

Further, an upper inner casing member 84 having a substantially disc shape is formed on a portion of the outer peripheral surface of the slider main body 103 facing upward in the vertical direction orthogonal to the extending direction, and the outer surface of the upper inner casing member 84 is The first convex spherical surface 87 is used.

Further, on the outer peripheral surface of the slider main body 103, the portion facing downward in the vertical direction perpendicular to the extending direction, specifically, the lower end opening edge of the slider main body 103 shown in FIG. Casing members 104 are respectively formed. These lower inner casing members 104 are each formed so as to bulge or protrude downward from the lower end opening edge.

Further, a fifth convex spherical surface (convex spherical surface) 107 is formed on the outer surface of the lower inner casing member 104. The center of the fifth convex spherical surface 107 is set to the center point P substantially. In the illustrated example, the radius D101 of the fifth convex spherical surface 107 is set to a value smaller than the radius D3 of the third convex spherical surface 20.

As described above, the inner casing member 106 includes the upper inner casing member 84, the side inner casing member 15, and the lower inner casing member 104. The inner casing member 106 includes the first convex spherical surface 87, the third convex spherical surface 20, and the like. A convex spherical portion 111 having a fifth convex spherical surface 107 is formed.

Further, the first, third, and fifth convex

spherical surfaces

87, 20, and 107 of the convex spherical surface portion 111 have a circumference around the center point P (in the example shown, around the center point P in the cross section orthogonal to the extending direction). Along each direction, they are spaced apart from each other. Specifically, the convex spherical surface portion 111 is disposed in the back direction along the vertical direction so as to sandwich the base 1 and the pair of third convex spherical surfaces 20 disposed in the back direction along the horizontal direction so as to sandwich the base 1. And a pair of the first convex spherical surface 87 and the fifth convex spherical surface 107. That is, in the illustrated example, the convex spherical surfaces are arranged in the back direction in the pair of the third convex spherical surfaces 20, and the convex spherical surfaces are arranged in the back direction in the pair consisting of the first convex spherical surface 87 and the fifth convex spherical surface 107. Are set to be orthogonal to each other.

The outer casing member 108 includes an upper outer casing member 115, a side outer casing member 116, and a lower outer casing member 117.
The upper outer casing member 115 has a substantially rectangular plate shape and is disposed above the slider body 103. In addition, on the lower surface of the upper outer casing member 115, protrusions 115A extending along the extending direction are formed at both ends in the horizontal direction orthogonal to the extending direction.

Further, the lateral outer casing member 116 has a substantially rectangular plate shape, and is suspended from both ends of the lower surface of the upper outer casing member 115, respectively. Specifically, the upper outer casing member 115 and the side of the upper outer casing member 116 are in a state where the upper end portion of the inner wall surface facing the inner side in the horizontal direction of the side outer casing member 116 is in contact with the outer wall surface facing the outer side in the horizontal direction. The outer casing member 116 is connected by a bolt 116A.

Further, the lower outer casing member 117 has a substantially rectangular plate shape, and is disposed at the lower end of the side outer casing member 116, respectively. Specifically, the lower outer casing member 117, the lateral outer casing member 116, and the lower outer casing member 117 are in contact with the lower end surface of the lateral outer casing member 116 at the horizontal outer end of the upper surface of the lower outer casing member 117. Are connected by a bolt 117A.

Further, a plurality of screw holes 115B for attaching the target member are formed on the upper surface of the upper outer casing member 115. A first concave spherical surface (concave spherical surface) 112 A is formed on the lower surface of the upper outer casing member 115. 112 A of 1st concave spherical surfaces are arrange | positioned corresponding to the 1st convex spherical surface 87, set the center point P substantially as the center, and have the radius substantially the same as the radius D81 of the 1st convex spherical surface 87. . Further, the first concave spherical surface 112A and the first convex spherical surface 87 are in contact with each other and are relatively slidable along the spherical surface direction.

Specifically, a recess 115C is formed in a portion corresponding to the upper inner casing member 84 on the lower surface of the upper outer casing member 115, and a sliding material 112 made of, for example, a fluororesin is accommodated in the recess 115C. Has been. The surface of the sliding member 112 facing the first convex spherical surface 87 is the first concave spherical surface 112A.

In the lateral outer casing member 116, a third concave spherical surface (concave spherical surface) 113A is formed on each inner wall surface facing inward in the horizontal direction. These third concave spherical surfaces 113A are arranged corresponding to the third convex spherical surfaces 20, respectively, have a center point P substantially set at the center thereof, and have substantially the same radius as the radius D3 of the third convex spherical surface 20. is doing. Further, the third concave spherical surface 113A and the third convex spherical surface 20 are in contact with each other and are relatively slidable along the spherical surface direction.

Specifically, in the inner wall surfaces of these lateral outer casing members 116, concave portions 116B are formed in portions corresponding to the lateral inner casing members 15, respectively. A sliding material 113 made of, for example, is accommodated. The surface of the sliding member 113 facing the third convex spherical surface 20 is the third concave spherical surface 113A.

Further, a fifth concave spherical surface (concave spherical surface) 114A is formed at each inner end portion in the horizontal direction on the upper surface of the lower outer casing member 117. These fifth concave spherical surfaces 114A are respectively arranged corresponding to the fifth convex spherical surfaces 107, have the center point P substantially set at the center thereof, and have a radius substantially the same as the radius D101 of the fifth convex spherical surface 107. is doing. Further, the fifth concave spherical surface 114A and the fifth convex spherical surface 107 are in contact with each other, and are relatively slidable along the spherical surface direction.

Specifically, on the upper surface of the lower outer casing member 117, a concave portion 117B is formed in a portion corresponding to the lower inner casing member 104, that is, the inner end portion, and the concave portion 117B includes, for example, fluorine. A sliding material 114 made of resin or the like is accommodated. The surface of the sliding member 114 facing the fifth convex spherical surface 107 is the fifth concave spherical surface 114A.

As described above, the outer casing member 108 is formed with the concave spherical surface portion 118 including the first concave spherical surface 112A, the third concave spherical surface 113A, and the fifth concave spherical surface 114A. In addition, the first, third, and fifth concave

spherical surfaces

112A, 113A, and 114A of the concave spherical surface portion 118 are disposed to face the first, third, and fifth convex

spherical surfaces

87, 20, and 107, respectively.

As described above, according to the linear motion guide 100 of the fifth embodiment, two pairs of convex spherical surfaces are provided so as to sandwich the way 1 so as to sandwich the rail platform 1, and with respect to these convex spherical surfaces, A plurality of concave spherical surfaces having substantially the same center are arranged opposite to each other to constitute a spherical bearing mechanism. Therefore, the spherical bearing mechanism is configured to allow loads from a plurality of directions acting on the slider 102, and the rigidity of the linear guide 100 is enhanced. Specifically, the linear motion guide 100 has greatly enhanced rigidity against external forces from the left and right in the horizontal direction and from the top and bottom in the vertical direction.

In particular, in this linear motion guide 100, out of the external force acting on the slider 102, the external force directed from the lower side in the vertical direction to the upper side, that is, the load acting on the slider 102 is directed from the lower side in the vertical direction to the upper side. The mechanical strength is greatly increased against the reverse radial load.

The present invention is not limited to the first to fifth embodiments described above, and various modifications can be made without departing from the spirit of the present invention.
For example, in the first to fifth embodiments, the linear motion guide or the ball screw has been described as the exercise device, but the present invention is not limited to this, and the slider is relatively parallel to the extending direction of the raceway. The present invention can also be applied to a moving ball spline or ball bush. Further, it may be used for various other exercise devices.

Moreover, the quantity or shape in which a load rolling-element rolling path is installed is not limited to this embodiment.
Further, the load rolling element rolling path has been described as forming a part of an infinite circuit, but is not limited to this, for example, a part of a so-called finite type circuit that does not circulate a ball. It doesn't matter.
Moreover, although demonstrated using the ball | bowl as a rolling element, it is not limited to this, For example, rolling elements other than that, such as a substantially cylindrical roller and a roller, may be sufficient.

Further, the

track bases

1, 31 and the track shaft 61 are not limited to those that extend in a straight line, but may extend in a curved shape. .

Further, in the present embodiment, it has been described that a plurality of convex spherical surfaces of the convex spherical surface portion and a plurality of concave spherical surfaces of the concave spherical surface portion are arranged to face each other to form a composite spherical bearing structure. For example, the combination of the convex spherical surface and the concave spherical surface may be only one pair. Alternatively, the combination of two or more pairs is not limited to the configuration described in the present embodiment, and for example, five or more pairs may be set.

In addition, although it has been described that a lubricating film or a sliding material is provided on at least one of the sliding surfaces of the spherical bearing mechanism, it may be configured to slide using a lubricant such as other grease. . Further, the lubricant film and the sliding material may not be provided.

Further, in the slider, when it is considered that the outer casing member rotates around the center point P with respect to the slider main body and the slider main body and the outer casing member come into contact with each other, the slider main body and the outer casing member A cushioning material such as rubber may be provided between them.

In the fourth embodiment, the plugs 96 A and 96 B are screwed into the outer casing member 88 so that the concave spherical portion 96 can advance and retract toward the convex spherical portion 91. However, the present invention is not limited to this. That is, the plugs 96 A and 96 B may be fitted into the outer casing member 88 using a method other than the fitting by screw action, and the concave spherical portion 96 may be advanced and retracted toward the convex spherical portion 91. Absent.

Further, in the fifth embodiment, the convex spherical surface portion 111 includes a pair of third convex spherical surfaces 20 arranged backward along the horizontal direction, a first convex spherical surface 87 arranged backward along the vertical direction, and Although the pair of the fifth convex spherical surfaces 107 is included, the present invention is not limited to this. In other words, the pair of the third convex spherical surface 20 and the pair composed of the first convex spherical surface 87 and the fifth convex spherical surface 107 may not be arranged backwardly along the horizontal direction or the vertical direction.
Further, the direction in which the convex spherical surfaces are arranged backward in the pair of third convex spherical surfaces 20 and the direction in which the convex spherical surfaces are arranged backward in the pair consisting of the first convex spherical surface 87 and the fifth convex spherical surface 107 are: Although set to be orthogonal, it is not limited to orthogonal.

In addition, various constituent elements described in the above embodiments can be appropriately replaced with each other without departing from the gist of the present invention, and the above-described modified examples may be appropriately combined.

Hereinafter, the present invention will be specifically described with reference to examples. However, the present invention is not limited to this embodiment.

[Example 1]
First, as Example 1, a pair of way tables 1 were prepared, and these way tables 1 were installed in parallel to each other on a horizontal base as shown in FIG. In addition, the pitch between the way 1 was set to 260 mm. Further, two sliders 2 (32, 82, 102) of the linear motion guides 10 (30, 80, 100) are disposed on each track base 1 with a gap in the extending direction. The pitch between the sliders arranged in the extending direction was set to 352 mm. Moreover, shim S1 was provided in the edge part in the bottom face of one way stand 1A among the pairs of way stand 1. FIG. The thickness of the shim S1 was set to 0.2 mm.

Further, a rectangular plate-shaped table T is fixed to the upper surface of the outer casing member 8 (58, 88, 108) of the four sliders arranged in this way by using bolts or the like. It was comprised so that it might move along the said extension direction with respect to. The stroke of the above-mentioned movement of the table T was set to 400 mm. As the table T, a table having a thickness of 90 mm and high rigidity was used.

Next, the table T arranged at the position shown in FIG. 7A was pushed at 10 mm / S toward the shim S1 side along the extending direction, and the rolling resistance was measured using a load cell. The result is shown as a graph E1 in FIG.

[Example 2]
Further, as Example 2, a shim S2 was provided at the end of the side surface of one way 1A instead of the shim S1. Note that the thickness of the shim S2 was set to 0.1 mm. Other than that, it measured on the conditions similar to Example 1. FIG. The result is shown as a graph E2 in FIG.

[Comparative Example 1]
Further, as Comparative Example 1, a known linear guide having no spherical bearing mechanism was used. Other than that, it measured on the conditions similar to Example 1. FIG. A result is shown as graph C1 of Fig.8 (a).

[Comparative Example 2]
Further, as Comparative Example 2, measurement was performed under the same conditions as in Example 2 except that a known linear guide having no spherical bearing mechanism was used. A result is shown as graph C2 of FIG.8 (b).

As shown in FIGS. 8A and 8B, in Examples 1 and 2, the rolling resistance of the table T is stable as a whole, particularly when the table T reaches the vicinity of the shims S1 and S2. It was found that the rolling resistance of the was reliably suppressed. That is, it was confirmed that the moment load was reliably removed by the spherical bearing mechanism of the linear motion guide 10 (30, 80, 100).
On the other hand, in Comparative Examples 1 and 2, it was found that the rolling resistance of the table T fluctuated greatly. In particular, the rolling resistance when the table T reached the vicinity of the shims S1 and S2 was significantly increased.

Claims

An exercise device comprising: an extending track body; a moving body that is relatively movable in the extending direction of the track body; and a plurality of rolling elements that are held by the moving body and used for the relative movement,
The movable body includes an inner casing member having a convex spherical surface portion that bulges toward the side opposite to the track body side;
An outer casing member that is disposed on the outer surface side of the inner casing member and has a concave spherical portion that is recessed corresponding to the convex spherical portion;
An exercise device comprising a spherical bearing mechanism including the inner casing member and the outer casing member.
The exercise device according to claim 1,
The convex spherical portion of the inner casing member includes a plurality of convex spherical surfaces having substantially the same center and different radii,
The apparatus according to claim 1, wherein the concave spherical surface portion of the outer casing member includes a plurality of concave spherical surfaces that are opposed to the convex spherical surface and have substantially the same center and different radii.
The exercise device according to claim 2,
The plurality of convex spherical surfaces include a first convex spherical surface, and a second convex spherical surface surrounding the first convex spherical surface and having a larger diameter than the first convex spherical surface;
The exercise device, wherein the plurality of concave spherical surfaces include a first concave spherical surface disposed opposite to the first convex spherical surface and a second concave spherical surface disposed opposite to the second convex spherical surface.
The exercise device according to any one of claims 1 to 3,
The exercise device characterized in that the concave spherical surface portion can be advanced and retracted toward the convex spherical surface portion.
The exercise device according to claim 4,
The exercise device characterized in that the concave spherical surface portion is fitted to the outer casing member by a screw action.
The exercise device according to any one of claims 1 to 5,
The convex spherical portion includes a plurality of convex spherical surfaces that are substantially the same in center and are spaced from each other around the center;
A plurality of pairs of the convex spherical surfaces that are arranged in the back so as to sandwich the track body are formed,
The exercise device according to claim 1, wherein the concave spherical portion includes a plurality of concave spherical surfaces that are substantially the same in center and are respectively disposed opposite to the convex spherical surface.
The exercise device according to claim 6,
An exercise apparatus characterized in that a direction in which the convex spherical surfaces of one convex spherical pair are arranged to face each other is orthogonal to the direction of the other convex spherical pair .
The exercise device according to any one of claims 1 to 7,
A plurality of load rolling element rolling paths for rolling the rolling elements between the track body and the moving body are provided along the extending direction of the track body,
An exercise device characterized in that the center of the spherical surface of the spherical bearing mechanism is disposed on a central axis at the same distance from the plurality of load rolling element rolling paths.
The exercise device according to any one of claims 1 to 7,
A loaded rolling element rolling path that causes the rolling element to roll between the track body and the moving body is provided in a spiral shape centering on a central axis of the track body,
An exercise device characterized in that a spherical center of the spherical bearing mechanism is disposed on the central axis.
9. The linear motion guide, ball spline, or ball bush that moves relative to the extending direction of the track body, the moving body is any one of claims 1 to 8. Exercise equipment.
10. The ball screw according to claim 1, wherein the moving body is a ball screw that is fitted to the track body by a screw action and relatively rotates in the extending direction of the track body. The exercise device described.