JP2012067838A - Attachment for temporary shaft of linear guide device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an attachment for a temporary shaft, suppressing damage to a side seal and an inner seal and also preventing damage to the temporary shaft, when moving a slider from the temporary shaft to a guide rail.SOLUTION: This attachment 32 for the temporary shaft has such an entire shape that the size of its cross-sectional surface when cut on a plane perpendicular to an axial direction is smoothly increased from an end 41 on the side of the temporary shaft toward an end on the side of the rail. The size of the cross-sectional surface of the end 41 on the side of the temporary shaft is substantially the same as the size of the cross-sectional surface of the axial end of the temporary shaft 20 to be attached, and the size of the cross-sectional surface of the end on the side of the rail is larger than the size of the cross-sectional surface of the end 41 on the side of the temporary shaft. A laminar projecting portion 45 provided at the end on the side of the rail is elastically deformed inward and is formed with a plurality of axially extending slits which are juxtaposed along a peripheral direction.

Description

  The present invention relates to a temporary shaft attachment that is used by being attached to a temporary shaft of a linear motion guide device.

An example of a general linear motion guide device will be described with reference to FIGS. FIG. 11 is a perspective view illustrating the configuration of the linear motion guide device. FIG. 12 is a front view of the linear motion guide device of FIG. 11 viewed from the axial direction (however, the end cap is omitted).
A slider 102 is assembled on a guide rail 101 having a substantially square cross section extending in the axial direction so as to be relatively movable in the axial direction. The cross-sectional shape of the slider 102 is substantially U-shaped, and the cross-sectional shape of the inner surface thereof is a shape along the cross-sectional shape of the outer surface of the guide rail 101. Two rolling element raceway surfaces 110, 110 extending in the axial direction are formed on both side surfaces 101a, 101a of the guide rail 101, respectively.

  The slider 102 includes a slider main body 102A and end caps 102B and 102B that are detachably attached to both ends of the slider in the axial direction. The inner surfaces of the left and right sleeve portions 106 and 106 of the slider main body 102A. Are formed with two rolling element raceway surfaces 111, 111, 111, 111 facing the rolling element raceway surfaces 110, 110, 110, 110 of the guide rail 101.

  Four rolling element rolling paths are formed by the rolling element raceway surfaces 110, 110, 110, 110 of the guide rail 101 and the rolling element raceway surfaces 111, 111, 111, 111 of the sleeve portions 106, 106. These rolling element rolling paths extend in the axial direction. Note that the number of rolling element raceway surfaces 110 and 111 included in the guide rail 101 and the slider 102 is not limited to two on one side, and may be one or three or more on one side, for example.

Further, a plurality of rolling elements 103 arranged in the axial direction are arranged in the rolling element rolling path so as to be freely rotatable, and the slider 102 guides through the rolling of these rolling elements 103. It moves smoothly along the rail 101 in the axial direction.
When such a linear motion guide device is used by being attached to an injection molding machine, a machine tool (for example, various grinding machines), a robot, etc., foreign matter such as dust, dust, etc. on the rolling element raceway surface 110 of the guide rail 101 and other exposed surfaces. As a result, the end cap 102B is usually provided with a dust seal side seal 105.

In other words, substantially plate-like side seals 105 and 105 are attached to both end portions in the axial direction of the slider 102 (the end surface in the axial direction of each end cap 102B), and an opening of a gap between the guide rail 101 and the slider 102 is formed. Of these, the portion opened to the end surface in the axial direction of the end cap 102B is sealed, and foreign matter from entering the gap and the lubricant flowing out from the gap are prevented.
Furthermore, the slider body 102A and the end cap 102B are provided with rolling elements in order to prevent foreign matters such as dust and dust that have entered the slider 102 beyond the side seal 105 from entering the rolling element raceway surfaces 110 and 111. An inner seal 109 is provided along the raceway surface 111.

  A mounting hole 107 is formed in the guide rail 101 so that the guide rail 101 can be fixed to an injection molding machine, a machine tool (for example, various grinding machines), a robot, or the like with a bolt. When foreign matter such as dust and dust accumulates in the mounting hole 107, foreign matter such as dust and dust adheres to the rolling element raceway surface 111 of the slider 102 when the slider 102 passes above the mounting hole 107. Since smooth movement may be hindered, the upper surface of the guide rail 101 is covered with, for example, a metal rail cover 108 and the upper opening of the mounting hole 107 is closed.

  When assembling the linear motion guide device by mounting the slider 102 on the guide rail 101, in order to prevent the rolling element 103 held in the slider 102 from falling off the rolling element raceway surface 111, The slider 102 is temporarily assembled on a resin temporary shaft (not shown) formed in substantially the same shape, and the temporary shaft is arranged coaxially and in a straight line with the guide rail 101, and the slider 102 on the temporary shaft is arranged. Is moved on the guide rail 101 in the axial direction.

  At this time, a step 130 is formed from the rail cover 108 and the upper surface or side surface 101 a of the guide rail 101 exposed from the rail cover 108. When the slider 102 is mounted, the step 130 and the side seal 105 and the inner seal 109 come into contact with each other, so that the rail cover 108, the side seal 105, and the inner seal 109 may be damaged. Further, if the rail cover 108 interferes with the side seal 105 and the inner seal 109 when the slider 102 is mounted, the slider 102 may not be moved smoothly.

  In order to solve such a problem, various techniques have been proposed. For example, Patent Document 1 discloses a technique in which a thin protrusion that protrudes so as to be abutted against the end of the rail cover in the width direction is provided at the end of the temporary shaft in the axial direction. When the slider on the temporary shaft is transferred to the guide rail, the inner seal rides on the protrusion of the temporary shaft, so that the inner seal is prevented from interfering with the rail cover. As a result, damage to the rail cover and the inner seal is suppressed, and the slider can be smoothly moved to the guide rail.

  Patent Document 2 discloses a temporary shaft whose cross-sectional outer shape is not uniform in the longitudinal direction. With such a configuration, the slider on the temporary shaft can be smoothly moved to the guide rail. Further, the cross-sectional shape of the temporary shaft is substantially the same as the cross-sectional shape of the guide rail of the linear motion guide device, and the size of the cross-sectional external shape of at least one end of the temporary shaft is larger than the size of the cross-sectional external shape of the guide rail. It is large and the size of the cross-sectional outer shape of the central portion of the temporary shaft is supposed to be smaller than the size of the cross-sectional outer shape of the guide rail. And from the axial direction edge part of a temporary shaft, the thin plate-shaped overhang | projection part along the outer periphery of the edge part of a temporary shaft protrudes. Therefore, it is possible to move the slider from the temporary shaft to the guide rail without damaging the side seal.

JP 2008-57690 A JP 2008-82504 A

  However, although the technique disclosed in Patent Document 1 can suppress damage to the rail cover and the inner seal, it is difficult to suppress damage to the side seal that contacts the entire outer periphery of the guide rail. Moreover, since the thickness of the protrusion of the temporary shaft is often very thin, there is a problem that it is easily broken. Therefore, it is necessary to increase the strength of the protrusion by using steel as the material of the temporary shaft. However, since the protrusion is integrated with the temporary shaft, the material of the entire temporary shaft must be changed from resin to steel. did not become.

Further, in the technique disclosed in Patent Document 2, although damage to the side seal and the inner seal can be suppressed, since the projecting portion is a thin plate, it is difficult to allow stress in the direction from the side seal or the rolling element to the projecting portion. . Therefore, the side seal is forcibly expanded outward (in the direction away from the temporary shaft), and the side seal may be damaged. Further, in many cases, a preload is applied to the rolling elements, but the overhanging portion cannot allow the preload, and thus may be damaged. Therefore, it is necessary to increase the strength of the overhanging part by using steel as the material of the temporary shaft. However, since the overhanging part is integrated with the temporary shaft, the material of the entire temporary shaft must be changed from resin to steel. did not become.
Therefore, the present invention solves the above-described problems of the prior art, and when the slider is moved from the temporary shaft to the guide rail, the side seal and the inner seal can be prevented from being damaged. It is an object to provide an attachment for a temporary shaft that can prevent damage.

  In order to solve the above problems, the present invention has the following configuration. In other words, the temporary shaft attachment of the linear motion guide device according to the present invention moves the slider assembled to the temporary shaft of the linear motion guide device in the axial direction, and transfers the slider from the temporary shaft to the guide rail. In this case, a substantially rod-shaped temporary shaft that is coaxially and straightly attached to an axial end on the side opposite to the axial end of the guide rail among both axial ends of the temporary shaft. This attachment is characterized in that the following three conditions A, B, and C are satisfied.

Condition A: Out of both axial ends, the axial end on the side attached to the temporary shaft is the temporary axial side end, and the axial end on the side facing the axial end of the guide rail is the rail side end. The overall shape is such that the size of the cross section when cut by a plane orthogonal to the axial direction is smoothly increased from the temporary shaft side end portion to the rail side end portion.
Condition B: The size of the cross section of the end portion on the temporary shaft side is substantially the same as the size of the cross section of the end portion in the axial direction of the temporary shaft to be attached. It is larger than the size of the cross section of the shaft side end.

Condition C: The outer peripheral surface of the rail side end is elastically deformable inward.
In the temporary shaft attachment of such a linear motion guide device, the rail side end portion includes a plate-like protruding portion that forms the outer peripheral surface and protrudes in the axial direction, and the protruding portion is inward. It is preferable that the elastic deformation is possible. And it is preferable that the said protrusion part is formed with the slit extended in an axial direction.

  The attachment for a temporary shaft of the linear motion guide device according to the present invention can prevent the side seal and the inner seal from being damaged and also prevent the temporary shaft from being damaged when the slider is moved from the temporary shaft to the guide rail. be able to.

It is a perspective view explaining the structure of a linear motion guide apparatus. It is a front view of the linear motion guide apparatus of FIG. It is a partial expanded sectional view explaining the structure of an inner seal. It is a perspective view explaining the method of mounting | wearing a guide rail with the slider temporarily assembled | attached to the temporary shaft. It is a side view explaining one embodiment of the attachment for temporary shafts of the linear motion guide device concerning the present invention. It is a front view of the attachment for temporary shafts of FIG. It is a perspective view of a temporary shaft set. It is a perspective view explaining the attachment for temporary shafts of a modification. It is a perspective view explaining the example which fixes the attachment for temporary shafts to a temporary shaft using a screw. It is a perspective view explaining the attachment for temporary shafts of another modification. It is a perspective view of the conventional linear motion guide apparatus. It is a front view of the linear motion guide apparatus of FIG.

An embodiment of a temporary shaft attachment of a linear guide device according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view illustrating the configuration of the linear motion guide device, and FIG. 2 is a front view of the linear motion guide device of FIG. 1 viewed from the axial direction (however, the end cap is omitted). ). In the following drawings, the same or corresponding parts are denoted by the same reference numerals.
A slider 2 is mounted on a substantially square guide rail 1 extending in the axial direction so as to be relatively movable in the axial direction. The cross-sectional shape of the slider 2 is substantially U-shaped, and the cross-sectional shape of the inner surface thereof is a shape along the cross-sectional shape of the outer surface of the guide rail 1. Two rolling element raceway surfaces 10, 10 extending in the axial direction are formed on both side surfaces 1a, 1a of the guide rail 1, respectively.

The slider 2 is composed of a slider body 2A and end caps 2B and 2B that are detachably attached to both end portions in the axial direction. The inner surface of the left and right sleeve portions 6 and 6 of the slider body 2A. Are formed with two rolling element raceway surfaces 11, 11, 11, 11 facing the rolling element raceway surfaces 10, 10, 10, 10 of the guide rail 1.
The rolling element raceway surfaces 10, 10, 10, 10 of the guide rail 1 and the rolling element raceway surfaces 11, 11, 11, 11 of the sleeve portions 6, 6 form four rolling element rolling paths. These rolling element rolling paths extend in the axial direction. Note that the number of rolling element raceway surfaces 10 and 11 provided in the guide rail 1 and the slider 2 is not limited to two on one side, and may be one or three or more on one side, for example.

Further, the slider 2 is a straight path (through a through-hole that penetrates in the axial direction in parallel with the rolling element rolling path at the upper and lower portions of the thick portions of the left and right sleeve portions 6 and 6 of the slider body 2A. Not shown).
On the other hand, the end cap 2B is made of, for example, an injection molded product of a resin material, and has a substantially U-shaped cross section. The end caps 2B and 2B are semi-doughnut-shaped curved paths (not shown) that connect the rolling element rolling paths and straight paths parallel to the left and right sides of the contact surface (back surface) with the slider body 2A. have.

  Then, a rolling element return path that feeds and circulates the rolling element 3 from the end point of the rolling element rolling path to the starting point is constituted by the straight path and the curved paths at both ends. A substantially annular rolling element circulation path is formed. In this rolling element circulation path, a large number of rolling elements 3 made of, for example, steel rollers are slidably loaded, and the slider 2 follows the guide rail 1 through the rolling of these rolling elements 3. To move in the axial direction. In FIG. 2, the rolling element 3 is a roller, but the present invention is naturally applicable to a linear motion guide device using a ball as the rolling element.

  When the slider 2 assembled to the guide rail 1 is moved in the axial direction along the guide rail 1, the rolling element 3 loaded in the rolling element rolling path rolls in the rolling element rolling path. While moving in the same direction as the slider 2 with respect to the guide rail 1. When the rolling element 3 reaches the end point of the rolling element rolling path, the rolling element 3 is scooped up from the rolling element rolling path by the tongue provided in the end cap 2B and sent to the curved path. The rolling element 3 that has entered the curved path makes a U-turn and is introduced into the straight path, and reaches the opposite curved path through the straight path. Here, the U-turn is performed again to return to the starting point of the rolling element rolling path, and the circulation in the rolling element circulation path is repeated infinitely.

  A mounting hole 7 is formed in the guide rail 1 so that such a linear motion guide device can be fixed to an injection molding machine, a machine tool (for example, various grinding machines), a robot or the like with a bolt. If foreign matter such as dust or dust accumulates in the mounting hole 7, foreign matter such as dust or dust adheres to the rolling element raceway surface 11 of the slider 2 when the slider 2 passes above the mounting hole 7. Since smooth movement may be hindered, for example, a metal or resin rail cover 8 covers almost the entire upper surface 1b of the guide rail 1 and closes the upper opening of the mounting hole 7. Then, both end portions 8 a in the width direction of the rail cover 8 are bent downward along the both side surfaces 1 a of the guide rail 1.

  Further, when the linear motion guide device is attached to an injection molding machine, a machine tool (for example, various grinding machines), a robot, etc., foreign matter such as dust or dust is present on the rolling element raceway surface 10 and other exposed surfaces of the guide rail 1. A dust seal side seal 5 is attached to the end cap 2B because it may accumulate and hinder rolling of the rolling element 3. That is, substantially plate-like side seals 5 and 5 that are in sliding contact with the outer surfaces (upper surface 1b and both side surfaces 1a) of the guide rail 1 are attached to both end portions in the axial direction of the slider 2 (the axial end surfaces of the end caps 2B). Thus, of the opening of the gap between the guide rail 1 and the slider 2, the portion opened to the end surface in the axial direction of the end cap 2B is sealed, so that foreign matter enters the gap and the gap enters the outside. Lubricant spillage is prevented.

  Further, as shown in FIGS. 2 and 3, the slider body 2A and the end cap 2B are provided with inner seals 9 and 9 along the rolling element raceway surfaces 11 on both the left and right sides. That is, the inner seal 9 extending in the axial direction is attached to the inner surface of the slider body 2A and the end cap 2B so as to be along the rolling element raceway surface 11. The lip portion 9a of the inner seal 9 is in sliding contact with both widthwise end portions 8a of the rail cover 8 bent downward along the side surface 1a of the guide rail 1. The inner seal 9 prevents foreign matters such as dust and dust that have entered the slider 2 beyond the side seal 5 from entering the rolling element raceway surfaces 10 and 11 from the upper surface 1 b side of the guide rail 1.

  When such a linear motion guide device is assembled by mounting the slider 2 from the axial end of the guide rail 1, the rolling element 3 held in the slider 2 falls off the rolling element track surface 11. In order to prevent this, the slider 2 is temporarily assembled on a resin-made (or metal) temporary shaft 20 formed in substantially the same shape as the guide rail 1, and the temporary shaft 20 is attached to the temporary shaft 20 as shown in FIG. The slider 2 on the temporary shaft 20 is moved in the axial direction toward the guide rail 1 and is transferred onto the guide rail 1 by being arranged coaxially and in a straight line with the guide rail 1.

  Alternatively, the slider 2 may be sold separately in a state where it is assembled to the temporary shaft 20. In this case, the temporary shaft 20 on which the slider 2 is assembled is arranged coaxially and in a straight line with the guide rail 1. Thus, the slider 2 on the temporary shaft 20 is moved in the axial direction toward the guide rail 1 and is transferred onto the guide rail 1. In FIG. 4, the illustration of the slider 2 on the temporary shaft 20 is omitted.

  Here, the temporary shaft 20 will be described. The temporary shaft 20 is formed in substantially the same shape as the guide rail 1 for the linear motion guide device. That is, the cross-sectional shape when cut along a plane orthogonal to the axial direction of the temporary shaft 20 is substantially the same as that of the guide rail 1. However, unlike the guide rail 1, the temporary shaft 20 is for temporarily assembling the slider 2, and therefore it is sufficient that its axial length is slightly longer than the axial length of the slider 2. Further, since the upper surface of the temporary shaft 20 does not need to be planar in function, a concave meat stealing (not shown) is provided in order to improve the dimensional accuracy of the temporary shaft 20.

  When the slider 2 on the temporary shaft 20 is moved in the axial direction toward the guide rail 1 and transferred onto the guide rail 1, conventionally, the side seal 5 and the temporary shaft 20 are damaged as described above. It sometimes occurred. Therefore, in the present embodiment, in order to prevent the side seal 5, the inner seal 9 and the temporary shaft 20 from being damaged, a substantially prismatic temporary shaft attachment 32 as shown in FIGS. To do.

  Hereinafter, a method of transferring the slider 2 from the temporary shaft 20 onto the guide rail 1 using the temporary shaft attachment 32 will be described with reference to FIGS. First, the temporary shaft attachment 32 is coaxially and straightly attached to the axial end portion of the temporary shaft 20 that faces the axial end portion of the guide rail 1 out of both axial end portions. . The temporary shaft attachment 32 is preferably detachably attached to the temporary shaft 20, but may be attached so that it cannot be removed. In the following, a provisional shaft set 34 is provided with the provisional shaft 20 attached with the provisional shaft attachment 32.

  Next, the temporary shaft set 34 is coaxial with the guide rail 1 while the other axial end of the temporary shaft attachment 32 having one axial end attached to the temporary shaft 20 is opposed to the axial end of the guide rail 1. They are arranged in a straight line (see FIG. 4, except that the temporary shaft 20 in FIG. 4 is replaced with a temporary shaft set 34). Then, the slider 2 on the temporary shaft 20 is moved in the axial direction toward the guide rail 1 and is transferred onto the guide rail 1. At this time, the temporary shaft set 34 and the guide rail 1 may be disposed in contact with each other, or may be disposed with a slight gap in the axial direction. In the following description, of the both axial ends of the temporary shaft attachment 32, the axial end on the side attached to the temporary shaft 20 is the temporary shaft side end 41, and the axial end on the side facing the guide rail 1 This part is referred to as a rail side end part 42.

  The temporary shaft attachment 32 has an overall shape in which the size of the cross section when cut along a plane orthogonal to the axial direction is smoothly increased from the temporary shaft side end 41 toward the rail side end 42. ing. The size of the cross section of the temporary shaft side end portion 41 of the temporary shaft attachment 32 is substantially the same as the size of the cross section of the axial direction end portion of the temporary shaft 20 (the end portion on the side where the temporary shaft attachment 32 is attached). It is said that. Therefore, the cross-sectional size of the rail-side end portion 42 of the temporary shaft attachment 32 is larger than the cross-sectional size of the temporary shaft-side end portion 41. The cross sections of the temporary shaft attachment 32 and the temporary shaft 20 mean a cross section when cut along a plane orthogonal to the axial direction unless otherwise specified.

  The cross-sectional shape of the temporary shaft side end 41 of the temporary shaft attachment 32 is substantially the same as the cross-sectional shape of the axial end portion of the temporary shaft 20 (the end portion on the side where the temporary shaft attachment 32 is attached). The cross-sectional shape of the rail-side end portion 42 is substantially similar to the cross-sectional shape of the axial end portion of the temporary shaft 20. In the example of FIG. 5, the cross-sectional size of the central portion between the rail-side end portion 42 and the temporary shaft-side end portion 41 of the temporary shaft attachment 32 is the same as the cross-sectional size of the temporary shaft-side end portion 41. Only the cross-sectional size of the rail-side end portion 42 is larger than the cross-sectional size of the temporary shaft-side end portion 41.

  Furthermore, the rail-side end portion 42 of the temporary shaft attachment 32 includes a core portion 44 and a thin plate-like projecting portion 45 formed so as to surround the outer periphery of the core portion 44 with a gap. That is, the core portion 44 and the protruding portion 45 protrude in the axial direction from the center portion sandwiched between the rail-side end portion 42 and the temporary shaft-side end portion 41 of the temporary shaft attachment 32 to form the rail-side end portion 42. is doing. Further, the outer peripheral surface of the projecting portion 45 is continuous with the outer peripheral surface of the central portion of the temporary shaft attachment 32, and the outer peripheral surface of the temporary shaft attachment 32 is formed by these both outer peripheral surfaces and the outer peripheral surface of the temporary shaft side end portion 41. Is configured.

  Further, the thin plate-like protruding portion 45 can be elastically deformed inward (that is, toward the core portion 44). Therefore, when a stress is applied to the protrusion 45 from the outside to the inside, the protrusion 45 is elastically deformed so as to bend inward. In FIG. 6, the protrusion 45 on the upper surface side of the temporary shaft attachment 32 is deformed downward, the protrusion 45 on the right side is deformed to the left, and the protrusion 45 on the left side is the right side. Deforms toward the direction. The protrusion 45 is not formed on the bottom side.

  At this time, it is preferable that a plurality of slits 47 extending in the axial direction are formed in the protruding portion 45 so as to be aligned along the circumferential direction. One end of the slit 47 in the axial direction opens at the end of the protrusion 45. With such a configuration, the protrusion 45 is more easily elastically deformed. The number of slits 47 is not particularly limited, and may be one, but forming a plurality of slits 47 makes it easier to elastically deform.

Since the temporary shaft attachment 32 has the above-described configuration, when the slider 2 on the temporary shaft 20 is transferred onto the guide rail 1, the side seal 5, the inner seal 9, and the temporary shaft 20 are attached. Damage is prevented from occurring. This point will be described in detail below.
When the slider 2 on the temporary shaft 20 is moved in the axial direction toward the guide rail 1 and the slider 2 reaches the temporary shaft attachment 32, the size of the cross section of the temporary shaft attachment 32 is the end portion on the temporary shaft side. As the slider 2 moves from the temporary shaft side end portion 41 to the rail side end portion 42, the side seal 5 and the inner seal 9 are attached to the temporary shaft attachment. Along the outer peripheral surface of 32, it is gradually spread outward (in a direction away from the temporary shaft attachment 32) without difficulty.

  In the example of FIG. 5, when the slider 2 moves onto the rail-side end portion 42, the side seal 5 and the inner seal 9 move outward (provisional shaft) along the outer peripheral surface (projecting portion 45) of the rail-side end portion 42. It begins to expand in the direction away from the attachment 32, and further expands outward along the outer peripheral surface (projecting portion 45) of the rail-side end portion 42 as it approaches the outermost end portion of the rail-side end portion 42.

  Therefore, when the slider 2 is transferred from the temporary shaft set 34 to the guide rail 1, the side seal 5 and the inner seal 9, the axial end surface of the guide rail 1 and the end surface of the rail cover 8 (as can be seen from FIG. And a step 30 is formed from the upper surface 1b or the side surface 1a of the guide rail 1 exposed from the rail cover 8, and the "end surface of the rail cover 8" is the end surface of the step 30). Since it can be avoided, damage to the side seal 5, the inner seal 9, and the rail cover 8 is suppressed, and the slider 2 can be smoothly moved to the guide rail 1.

  Moreover, since the protrusion part 45 of the temporary shaft attachment 32 can be elastically deformed inward, the stress from the side seal 5 or the rolling element 3 can be allowed. In other words, even if stress or preload is applied to the temporary shaft attachment 32 from the side seal 5 or the rolling element 3 to which preload is applied, the slider 2 is temporarily blocked because the protrusion 45 is buffered by elastic deformation. The protrusion 45 is hardly damaged when passing over the shaft attachment 32. Therefore, it is not necessary to use steel as the material for the temporary shaft attachment 32, and it is possible to use resin. Therefore, the temporary shaft attachment 32 can be manufactured easily and at low cost.

  As described above, when the temporary shaft attachment 32 is used, the side seal 5, the inner seal 9, and the rail cover 8 can be prevented from being damaged when the slider 2 is moved from the temporary shaft 20 to the guide rail 1. . Further, the temporary shaft 20 can be prevented from being damaged when the slider 2 is moved from the temporary shaft 20 to the guide rail 1, and the temporary shaft attachment 32 itself is hardly damaged.

  In addition, this embodiment shows an example of this invention and this invention is not limited to this embodiment. For example, the number of slits 47 formed in the protruding portion 45 is not particularly limited, and a large number may be formed as shown in FIG. If it does so, since the protrusion part 45 will become easy to be elastically deformed more highly, the stress from the side seal 5 or the rolling element 3 can be permitted more. As a result, the protrusion 45 is less likely to be damaged when the slider 2 passes over the temporary shaft attachment 32.

  The attachment structure between the temporary shaft attachment 32 and the temporary shaft 20 is not particularly limited, but is preferably a simple structure. For example, as shown in FIGS. 5 and 7, a substantially L-shaped convex portion 51 protruding in the axial direction from the temporary shaft side end portion 41 of the temporary shaft attachment 32 is provided at the axial end portion of the temporary shaft 20. In addition, an attachment structure that fits into the concave portion 52 having a shape corresponding to the convex portion 51 is preferable. In addition, the shape of the convex part 51 and the recessed part 52 is not limited to substantially L shape.

  With such a simple structure, the portion can be manufactured by cutting. Further, if the temporary shaft attachment 32 and the temporary shaft 20 are manufactured by resin injection molding, the structure of the mold becomes simple, and the manufacturing cost can be kept low. Furthermore, since the structure of the mold is simple, the temporary shaft attachment 32 and the temporary shaft 20 which are molded products can be molded with high dimensional accuracy.

  Furthermore, in addition to the mounting structure as described above, the temporary shaft attachment 32 and the temporary shaft 20 may be fixed using screws 61 as shown in FIG. If it attaches with both the said attachment structure and the screw 61, the attachment 32 for temporary shafts and the temporary shaft 20 can be fixed more firmly. Moreover, since it is only necessary to provide the screw shaft 62 in the temporary shaft attachment 32 and the temporary shaft 20, the processing cost does not increase so much, and more firm fixation can be realized at low cost.

  Further, as shown in FIG. 10, if the axial length of the temporary shaft attachment 32 is substantially the same as the temporary shaft set 34, the temporary shaft attachment 32 alone has the same function as the temporary shaft set 34. Therefore, the temporary shaft 20 is not necessary. That is, the slider 2 may be assembled to the long temporary shaft attachment 32 and the slider 2 may be transferred from the long temporary shaft attachment 32 to the guide rail 1. Therefore, the step of attaching the temporary shaft attachment 32 to the temporary shaft 20 can be omitted, and the cost can be reduced because the temporary shaft 20 is unnecessary.

DESCRIPTION OF SYMBOLS 1 Guide rail 2 Slider 2A Slider main body 2B End cap 3 Rolling body 5 Side seal 8 Rail cover 9 Inner seal 32 Temporary shaft attachment 34 Temporary shaft set 41 Temporary shaft side end 42 Rail side end 45 Protrusion 47 Slit 51 Convex Part 52 Concave part 61 Screw

Claims (3)

When the slider assembled to the temporary shaft of the linear motion guide device is moved in the axial direction, and the slider is transferred from the temporary shaft to the guide rail, the guide rail of the guide rail is out of both ends in the axial direction of the temporary shaft. It is a substantially rod-shaped temporary shaft attachment that is used so as to be coaxial and straight-lined to the axial end on the side facing the axial end. The following three conditions A, B, and C are satisfied: Attachment for temporary shaft of linear motion guide device characterized by satisfaction.
Condition A: Out of both axial ends, the axial end on the side attached to the temporary shaft is the temporary axial side end, and the axial end on the side facing the axial end of the guide rail is the rail side end. The overall shape is such that the size of the cross section when cut by a plane orthogonal to the axial direction is smoothly increased from the temporary shaft side end portion to the rail side end portion.
Condition B: The size of the cross section of the end portion on the temporary shaft side is substantially the same as the size of the cross section of the end portion in the axial direction of the temporary shaft to be attached. It is larger than the size of the cross section of the shaft side end.
Condition C: The outer peripheral surface of the rail side end is elastically deformable inward.   The rail side end portion includes a plate-like projecting portion that forms the outer peripheral surface and projects in the axial direction, and the projecting portion is elastically deformable inward. The attachment for temporary shafts of the linear motion guide apparatus of Claim 1.   The attachment for temporary shafts of the linear motion guide device according to claim 2, wherein a slit extending in the axial direction is formed in the projecting portion.

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