JP2009058072A - Motion apparatus and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motion device and its manufacturing method capable of positioning accurately a moving element and a lid and generating a smooth relative movement of the moving element and a track piece. <P>SOLUTION: The motion device 1 is equipped with the track piece 2 and the moving element 3 inserted into the track piece 2 and guided in such a way as able to reciprocate in the extending direction L of the track piece 2, wherein the moving element 3 holds rollers internally, which are sealed to the moving element 3 by the lid 4 arranged at the two ends in the extending direction L of the moving element 3, the element 3 being furnished with a positioning hole 3d penetrating in the extending direction L, characterized by that the moving element 3 and the lid 4 are positioned by the use of the locating hole 3d. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a motion apparatus that relatively moves a moving body along an extending track body such as a ball spline and a guide, and a method for manufacturing the same.

  Conventionally, in order to feed and move workpieces and tools with high precision in machine equipment such as machine tools and various industrial machines, or to move movable members with high precision in precision equipment, etc. An exercise device such as a ball spline or a guide is used.

  In general, the exercise device includes a track body that extends and a moving body that is inserted through the track body and supported so as to be movable in the extending direction. A rolling element made up of a large number of balls or the like is held inside the moving body, and the moving body and the track body can be smoothly moved relative to each other via the rolling elements. And the member attached to an exercise | movement apparatus is moved by moving these mobile bodies and a track body relatively.

  In order to hold the rolling element inside the moving body, both ends in the extending direction of the track body are abutted and sealed so as to be narrowed by two lid bodies, and these are integrally formed. Has been. Further, as the lid body, there are a turn plate (rolling body direction changing inner circumferential guide member) for supporting the inner side of the rolling element, and an end cap (rolling body direction changing outer circumferential guide member) for supporting the outer side of the rolling body. The thing comprised from these is also known.

  In general, the lid is fixed to the moving body by screwing or the like. This fixing is performed by providing a screw hole in advance in the moving body and screwing the screw from the lid side. In this way, the rolling elements sealed inside the moving body and the lid are configured to roll in the rolling element rolling path formed in the moving body and the lid.

In order to smoothly perform the relative movement between the moving body and the track body of the exercise device, it is necessary to smoothly roll the rolling bodies held inside the moving body and the lid body. For this reason, various proposals have been conventionally made so as not to provide a step as much as possible on the rolling element rolling path formed inside the movable body and the lid (see, for example, Patent Document 1).
JP 2007-107648 A

  However, it is difficult to accurately position and fix the movable body and the lid, and the rolling element rolling path formed inside each of the movable body and the lid is integrated with the movable body and the lid. When the two are fixed, there are cases where a slight level difference is formed in the road due to a slight deviation between the contact surfaces in the circumferential direction and the surface direction. Due to this step, smooth rolling of the rolling element is hindered, and there is a problem that relative movement between the moving body and the track body cannot be performed smoothly.

  The present invention has been made in consideration of such circumstances, and an exercise device capable of accurately positioning the moving body and the lid and relatively moving the moving body and the track body relatively, and its manufacture. It aims to provide a method.

  In order to achieve the above object, the present invention proposes the following means. That is, the present invention is an exercise device including a track body and a moving body that is inserted through the track body and guided so as to be reciprocally movable in the extending direction of the track body. The moving body is held, and the rolling body is sealed to the moving body by lids disposed at both ends in the extending direction of the moving body. A positioning hole penetrating in the direction is provided, and the movable body and the lid body are positioned using the positioning hole.

  According to the exercise device according to the present invention, the movable body is provided with the positioning hole penetrating in the extending direction, and the movable body and the lid body disposed at both ends thereof using the positioning hole. And positioning. Therefore, when the movable body and the lid body are fixed, the circumferential and surface positions of the contact surfaces of the movable body and the lid body are positioned and connected with high accuracy without being shifted. The passages of the rolling elements formed inside the body and the lid are prevented as much as possible from forming a step in the passages when connected. Therefore, the rolling element can smoothly roll and the relative movement between the moving body and the track body can be performed smoothly.

  Further, in the exercise device according to the present invention, the lid includes a rolling element direction changing inner peripheral guide member that supports the inner side of the rolling element, and a rolling element direction changing outer peripheral guide member that supports the outer side of the rolling element. It may be provided. According to this, the lid body is formed in the inside thereof, and the path for rolling the rolling element is divided into an inner side and an outer side of the rolling element, and the rolling body direction changing inner circumferential guide member and It is divided | segmented into the rolling element direction change outer periphery guide member. And since these two guide members are adapted to change the direction of the rolling elements, a curved portion for changing the direction of the rolling elements is provided in the passage provided in the moving object for rolling the rolling elements. There is no need to form. Thereby, the said channel | path can be formed more accurately.

  In the exercise device of the present invention, the rolling element is changed by the first engaging portion formed on the rolling element direction changing inner circumferential guide member and the second engaging portion formed on the rolling element direction changing outer circumferential guide member. The moving body direction changing inner circumferential guide member and the rolling body direction changing outer circumferential guide member may be formed with an alignment portion in which they are positioned relative to each other.

  According to this, the first engaging portion and the second engaging portion provided on the rolling element direction changing inner peripheral guide member and the rolling element direction changing outer peripheral guide member are respectively engaged with each other so as to engage with each other. Is forming. For example, the alignment portion can be configured by forming a first engagement portion and a second engagement portion by a protruding portion and a receiving portion. And these rolling element direction change inner periphery guide member and rolling element direction change outer periphery guide member are positioned mutually by the said engagement, and they are positioned accurately, without the position of a circumferential direction and a surface direction shifting. ing.

  Further, the present invention is a method of manufacturing an exercise device having a moving body that is inserted into an extended track body and is guided so as to be reciprocally movable in the extending direction of the track body. A wire that is disposed at both ends in the extending direction and seals the rolling body inside the moving body so as to position the lid with respect to the moving body so as to penetrate the moving body. It is formed by electric discharge machining.

  According to the method for manufacturing an exercise device according to the present invention, the positioning holes for positioning the moving body and the lid bodies that are arranged at both ends of the moving body and seal the rolling body are provided through the moving body. Therefore, when the movable body and the lid are fixed, the positions of the circumferential and surface directions of the lids at both ends are not shifted, and the movable body and the lid are positioned with extremely high accuracy. Can do.

  In addition, since the positioning hole is formed by wire electric discharge machining, for example, the positioning hole is formed by penetrating using a cutting tool or the like, and the dimensional accuracy of the cutting tool is lowered, for example. There is no fear of letting it go. Therefore, the dimensional accuracy is further improved.

  Further, in the method for manufacturing an exercise device according to the present invention, the load rolling element rolling surface for rolling the rolling element inside the moving body and the rolling element return passage pass through the moving body so as to penetrate the moving body. It is good also as forming by wire electric discharge machining simultaneously with a positioning hole. According to this, the load rolling-element rolling surface and the rolling-element return passage which are provided penetrating the moving body and roll the rolling element are formed by wire electric discharge machining. Therefore, as in the prior art, these loaded rolling element rolling surfaces and rolling element return passages are formed by penetrating them using a cutting tool or the like, and the dimensional accuracy of the cutting tool is reduced, for example, by shaking the tip of the cutting tool. There is no fear. Therefore, these processes can be performed with extremely high accuracy.

  In addition, the path for rolling the rolling element formed inside each of the movable body and the lids arranged at both ends thereof has no risk of forming a step in the path, The rolling element can roll smoothly. Furthermore, since the load rolling element rolling surface, the rolling element return passage, and the positioning hole are simultaneously formed by wire electric discharge machining, these machining can be performed easily and in a short time with high accuracy.

  According to the exercise device and the method for manufacturing the same according to the present invention, the moving body and the lid can be easily and accurately positioned with high accuracy, and the moving body and the track body can be smoothly moved relative to each other. it can.

Embodiments of the present invention will be described below with reference to the drawings.
1 is an exploded perspective view showing a schematic configuration of a ball spline as an exercise device according to an embodiment of the present invention, FIG. 2 is a side view showing the schematic configuration of the ball spline in FIG. 1, and FIG. 3 is a front view showing a moving body. FIG. 4 is an exploded perspective view showing the lid.

  As shown in FIGS. 1 and 2, a ball spline 1 as an exercise device of the present embodiment includes a round bar-like or pipe-like spline shaft (track body) 2, and an outer periphery of the spline shaft 2. Two rolling element rolling grooves (rolling element rolling surfaces) 2a extending along the axis L direction (extending direction) of the spline shaft 2 and arranged opposite to the diameter direction of the spline shaft 2 are formed on the surface. Yes. A cylindrical moving body 3 is provided so as to be inserted through the spline shaft 2. The movable body 3 has two load rolling element rolling grooves (loaded rolling element rolling surfaces) 3a formed on the inner peripheral surface thereof so as to face the rolling element rolling grooves 2a.

  As shown in FIG. 2, a linear space formed in the direction of the axis L by the rolling element rolling grooves 2a and the loaded rolling element rolling grooves 3a is a loaded rolling element rolling path 3b. Is penetrated in the direction of the axis L. Further, as shown in FIG. 3, a linear rolling element return passage 3c extending in parallel with the load rolling element rolling groove 3a is provided between the inner peripheral surface 3e and the outer peripheral surface of the moving body 3. Similarly, the movable body 3 is penetrated.

  In addition, a positioning hole 3d is provided between the load rolling element rolling groove 3a and the rolling element return passage 3c so as to extend in parallel therewith. As shown in FIG. 3, the load rolling element rolling groove 3a, the rolling element return passage 3c, and the positioning hole 3d are all formed simultaneously with the inner peripheral surface 3e of the moving body 3 by one wire electric discharge machining in advance. ing. That is, they are formed so that a part of the outer periphery of the cross-sectional shape of each through hole is connected. In addition, it is preferable that the processing width h for connecting them is formed as small as possible.

  Further, as shown in FIG. 2, at both ends in the axis L direction of the moving body 3, lid bodies 4 having a ring shape and formed as an assembly are respectively inserted through the spline shaft 2. The moving body 3 is abutted and fixed. These are fixed by screwing or bonding (not shown). As shown in FIG. 1, the lid body 4 includes a turn plate (rolling body direction changing inner peripheral guide member) 6 disposed on the moving body 3 side and an end cap (on the opposite side to the moving body 3 side). The rolling element direction changing outer periphery guide member) 7 is fitted and configured as an assembly. Further, the outer diameter dimension of the lid 4 is formed to be substantially the same as the outer dimension of the movable body 3.

  Moreover, as shown in FIG. 2, the cover body 4 is arrange | positioned adjacent to the load rolling-element rolling path 3b and this load rolling-element rolling path 3b in the vicinity of the surface contact | abutted with the end surface of the moving body 3. As shown in FIG. A rolling element direction changing path 4a in a semi-annular space for connecting the rolling element return passage 3c and changing the direction of the rolling element is provided. The rolling element rolling path 8 is a substantially elliptical annular or circuit-like circulation path formed integrally by the load rolling element rolling path 3b, the rolling element return path 3c, and the rolling element direction changing path 4a. A plurality of rolling elements 5 made of balls are accommodated in the moving body rolling path 8 in a freely circulating manner.

  Thereby, the rolling element 5 that has rolled on the loaded rolling element rolling path 3b is introduced into the rolling element direction changing path 4a from one end side of the loaded rolling element rolling path 3b, the direction is reversed, and the rolling element returns. Rolling in the passage 3c, introduced into the rolling element direction changing path 4a on the other end side, changed in direction, and entering the other end side of the loaded rolling element rolling path 3b again to allow endless circulation. . And these rolling elements 5 are comprised so that the mobile body 3 and the spline shaft 2 can be smoothly moved relatively in the direction of the axis L by rolling the inside of the rolling element rolling path 8. FIG.

  Further, as shown in FIGS. 4A and 4B, the rolling element direction changing path 4 a of the lid body 4 is a rolling element direction changing inner peripheral guide portion 6 a of the turn plate 6 constituting the lid body 4. And the rolling element direction change outer periphery guide part 7a of the end cap 7 are formed so as to face each other. The turn plate 6 has a substantially C shape, and has a convex curved outer contact surface 6b formed on the radially outer side of the rolling element direction changing inner peripheral guide portion 6a, and a radially inner side. And a convex curved inner contact surface 6c formed on the side. These outer contact surface 6b and inner contact surface 6c constitute a first engagement portion 9. Further, the outer contact surface 6 b has a ridge line 6 d at its radially outer end on the outer peripheral surface of the turn plate 6.

  The end cap 7 has a substantially ring shape, and has a concave curved outer contact surface 7b formed on the radially outer side of the rolling element direction changing outer periphery guide portion 7a, and an inner side. And a concave curved inner contact surface 7c formed. The outer contact surface 7b and the inner contact surface 7c constitute the second engagement portion 10. Further, the outer abutting surface 7 b has a ridge line 7 d at its radially outer end on the outer peripheral surface of the end cap 7.

  The turn plate 6 and the end cap 7 are fitted together so that the first engagement portion 9 and the second engagement portion 10 are brought into contact with each other without any gap. As shown in FIG. 1, the first engaging portion 9 and the second engaging portion 10 that are fitted together form an alignment portion 11.

  4A, two protrusions 6e are provided on the surface of the turn plate 6 on the moving body 3 side so as to protrude so as to correspond to the positioning holes 3d of the moving body 3. As shown in FIG. These projections 6e have a truncated conical shape, and the diameter of the bottom thereof is substantially the same as the diameter of the inner periphery of the positioning hole 3d. Note that the turn plate 6 and the end cap 7 are formed by molding a resin or the like, for example, and have a good dimensional accuracy.

  1 and 2, the movable body 3 and the lid body 4 are inserted into the spline shaft 2, and a plurality of rolling element rolling paths 8 formed inside the movable body 3 and the lid body 4 are provided. The rolling element 5 is sealed and fixed in close contact with each other in the direction of the axis L, whereby the ball spline 1 is manufactured.

  According to the ball spline 1 of the present embodiment, the moving body 3 is provided with a positioning hole 3d penetrating in the direction of the axis L of the spline shaft 2, and the positioning hole 3d on the moving body 3 side of the lid 4 is provided. The protrusion 6e is provided so as to correspond to the above, and the positioning of the movable body 3 and the lid body 4 is performed by fitting the positioning hole 3d and the protrusion 6e. Therefore, when the movable body 3 and the lid body 4 are fixed, they are positioned and connected with high accuracy without shifting the positions in the circumferential direction and the surface direction on the mutual contact surfaces.

  Further, the rolling element rolling path 8 formed inside each of the moving body 3 and the lid body 4 for rolling the rolling element 5 and integrated by the fixing has a step formed in the path upon the connection. Is to be prevented as much as possible. Therefore, the rolling element 5 can smoothly roll, and the relative movement between the moving body 3 and the spline shaft 2 can be performed smoothly.

  The lid 4 is divided into a turn plate 6 and an end cap 7 so that the rolling element direction changing path 4a formed inside is divided into an inner side and an outer side of the rolling element 5. Has been. And since these rolling plates 6 and end caps 7 change the direction of the rolling elements 5, it is necessary to form a curved portion for changing the direction of the rolling elements 5 in the portion of the rolling element rolling path 8 provided in the moving body 3. There is no. Thereby, the rolling-element rolling path 8 can be formed more accurately.

  Further, the turn plate 6 and the end cap 7 constituting the lid body 4 are fitted so that the first engagement portion 9 and the second engagement portion 10 provided in the lid body 4 are in contact with each other without a gap, respectively. The first engaging portion 9 and the second engaging portion 10 form an alignment portion 11. Since these fitting is performed using the convex curved surface and the concave curved surface of the first engaging portion 9 and the second engaging portion 10, the turn plate 6 and the end cap 7 are positioned in the circumferential direction and the surface direction. Are positioned accurately without shifting from each other.

  Further, the radially outward ridgelines 6d and 7d of the outer contact surfaces 6b and 7b of the turn plate 6 and the end cap 7 form a part on the outer peripheral surface of the turn plate 6 and the end cap 7, respectively. Is provided. Therefore, as in the prior art, a portion where the turn plate 6 and the end cap 7 are fitted is provided so as to be incorporated in the radially inward direction, and the radial dimension of the turn plate 6 and the end cap 7 is determined. There is no need to make it larger. Therefore, since the turn plate 6 and the end cap 7 can be formed to be as compact as possible in the radial direction, the ball spline 1 itself can be miniaturized, and can meet various applications and various demands. Can do.

  In addition, positioning holes 3d for positioning the moving body 3 and the lid body 4 disposed at both ends of the moving body 3 and sealing the rolling element 5 are provided so as to penetrate the moving body 3. 3 and the lid 4 are fixed, the positions of the lids 4 at both ends are not shifted in the circumferential direction and the plane direction, and the movable body 3 and the lid 4 can be positioned with extremely high accuracy. it can.

  Further, since the positioning hole 3d is formed by wire electric discharge machining, for example, the positioning hole is formed by penetrating using a cutting tool or the like, and the tip of the cutting tool is shaken to increase the dimensional accuracy. There is no risk of lowering. Therefore, the dimensional accuracy is further improved.

  Further, a load rolling element rolling groove 3a and a rolling element return passage 3c provided through the moving body 3 for rolling the rolling element 5 are formed simultaneously with the positioning hole 3d by wire electric discharge machining. Therefore, as in the prior art, the load rolling element rolling groove 3a and the rolling element return passage 3c are formed by penetrating them using a cutting tool or the like, and the dimensional accuracy of the cutting tool is reduced, for example, by shaking. There is no fear of letting it go. Therefore, these processes can be performed with extremely high accuracy.

  Further, the rolling element rolling path 8 formed inside each of the movable body 3 and the lid body 4 disposed at both ends thereof has no risk of forming a step in the path, and the rolling element 5 can smoothly roll. Furthermore, since the load rolling element rolling groove 3a, the rolling element return passage 3c, and the positioning hole 3d are simultaneously formed by wire electric discharge machining, these machining can be performed easily and in a short time with high accuracy.

  The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the present embodiment, the ball spline 1 is used as the exercise device, but the present invention is not limited to this, and other exercise devices such as a guide may be used.

  Moreover, although this embodiment demonstrated using the exercise | movement apparatus of the type which the rolling element 5 circulates infinitely, it is applicable not only to this but what is called a finite type exercise | movement apparatus with which the rolling element 5 does not circulate. Moreover, although demonstrated using the ball | bowl as the rolling element 5, not only this but a roller etc. may be used.

  Further, the spline shaft (track body) 2 may not be linear but may be formed in a curved shape. Further, the cross-sectional shape and the number of rolling element rolling grooves 2a are not limited to this embodiment.

It is a disassembled perspective view which shows schematic structure of the ball spline as an exercise | movement apparatus of one Embodiment of this invention. It is a side view showing a schematic structure of a ball spline as an exercise device of one embodiment of the present invention. It is a front view which shows a moving body. It is a disassembled perspective view which shows a cover body.

Explanation of symbols

1 Ball spline (exercise device)
2 Spline shaft (track body)
3 Moving body 3a Loaded rolling element rolling groove (Loaded rolling element rolling surface)
3c Rolling body return passage 3d Positioning hole 4 Lid 5 Rolling body 6 Turn plate (Rolling body direction changing inner circumference guide member)
7 End cap (Rolling body direction change outer periphery guide member)
9 First engaging portion 10 Second engaging portion 11 Positioning portion L Axial direction (extending direction) of spline shaft

Claims (5)

An exercise apparatus comprising a track body and a moving body that is inserted into the track body and guided so as to be reciprocally movable in the extending direction of the track body,
The moving body holds a rolling element inside,
The rolling element is sealed to the moving body by lids disposed at both ends in the extending direction of the moving body,
The moving body is provided with a positioning hole penetrating in the extending direction,
The exercise device, wherein the movable body and the lid are positioned using the positioning hole. The exercise device according to claim 1,
The lid body includes a rolling element direction changing inner circumferential guide member that supports the inner side of the rolling element, and a rolling element direction changing outer circumferential guide member that supports the outer side of the rolling element. Exercise equipment. The exercise device according to claim 2,
A first engagement portion formed on the rolling element direction changing inner circumferential guide member;
With the second engagement portion formed on the rolling element direction change outer periphery guide member,
An exercising apparatus, wherein an alignment portion is formed in which the rolling element direction changing inner circumferential guide member and the rolling element direction changing outer circumferential guide member are positioned relative to each other. A method for manufacturing an exercise device having a moving body that is inserted into an extended track body and guided so as to be reciprocally movable in the extending direction of the track body,
Positioning holes for positioning the lid that is disposed at both ends of the movable body in the extending direction and seals the rolling body inside the movable body penetrates the movable body. A method for manufacturing an exercise device, wherein the method is formed by wire electric discharge machining. A method for manufacturing an exercise device according to claim 4,
A load rolling element rolling surface and a rolling element return path for rolling the rolling element inside the moving body are formed by wire electric discharge machining simultaneously with the positioning hole so as to penetrate the moving body. A method for manufacturing an exercise device.

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