WO2022210059A1

WO2022210059A1 - Attachment for temporary shaft of linear motion guide device

Info

Publication number: WO2022210059A1
Application number: PCT/JP2022/012897
Authority: WO
Inventors: 厚和田
Original assignee: 日本精工株式会社
Priority date: 2021-03-29
Filing date: 2022-03-18
Publication date: 2022-10-06
Also published as: TW202246665A; JPWO2022210059A1

Abstract

Provided is an attachment for a temporary shaft of a linear motion guide device, wherein: a cross-section orthogonal to the axial direction of a rail side end part (43) has a size such that the shape of the cross-section smoothly expands from a temporary shaft side end part (42) toward the rail side end part (43); the size of a cross-section of the temporary shaft side end part (42) is equal to the size of a cross-section of an axial direction end part (31) of a temporary shaft (30); and the size of the cross-section of the rail side end part (43) is greater than the size of the cross-section of the temporary shaft side end part (42). The rail side end part (43) comprises a plate-shaped protrusion (47) that forms an outer surface and that protrudes in the axial direction. A plurality of elastic deformation parts which are each elastically deformable in a thickness direction are formed on the projection (47), and the plurality of elastic deformation parts are divided by a plurality of slits (49) extending in the axial direction. An elastic deformation part (60) at a position through which a rolling body (103) passes is wider than a raceway surface of the rolling body (103). Due to the foregoing, seal breakage and damage to the rolling body can be prevented when a slider is moved from the temporary shaft to a guide rail.

Description

Attachment for temporary shaft of linear guideway

The present invention relates to a temporary shaft attachment for a linear motion guide device that is attached to a temporary shaft of the linear motion guide device.

An example of a general linear guide device will be described with reference to FIGS. FIG. 6 is a perspective view for explaining the configuration of the linear guide device. 7 is a front view of the linear motion guide device of FIG. 6 as seen from the axial direction (however, the end cap is omitted).
In the linear guide device 100, a slider 102 is mounted on a guide rail 101 extending in the axial direction and having a substantially rectangular cross section so as to be relatively movable in the axial direction. The cross-sectional shape of the slider 102 is substantially an inverted U-shape, and the cross-sectional shape of the inner surface is made to follow the cross-sectional shape of the outer surface of the guide rail 101 . Both

side surfaces

101a, 101a of the guide rail 101 are formed with two axially extending rolling

element raceway surfaces

110, 110, respectively.

The slider 102 is composed of a slider main body 102A and

end caps

102B, 102B detachably attached to both ends in the axial direction 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. As a result, these rolling element rolling paths extend in the axial direction. The number of rolling

element raceway surfaces

110, 111 provided in the guide rail 101 and the slider 102 is not limited to two on one side, and may be, for example, one on one side or three or more.

Furthermore, a plurality of rolling elements 103 arranged along the axial direction are rotatably arranged in the rolling element rolling path. It moves smoothly in the axial direction along the rail 101 .
When such a linear motion guide device 100 is attached to an injection molding machine, a machine tool (for example, various grinders), a robot, or the like, dirt, dust, etc., may accumulate on the rolling element raceway surface 110 of the guide rail 101 or other exposed surfaces. Since there is a risk that foreign matter may accumulate and interfere with the rolling of the rolling element 103, a dust-proof side seal 105 is usually attached to the end cap 102B.

Approximately plate-like side seals 105 are attached to both ends of the slider 102 in the axial direction (end faces of the end caps 102B in the axial direction) to close the opening of the gap between the guide rail 101 and the slider 102. Of these, the portion that opens to the end face in the axial direction of the end cap 102B is sealed to prevent foreign matter from entering the gap and lubricant from flowing out from the gap.
Further, the slider main body 102A and the end cap 102B are provided with a rolling element 102A and an end cap 102B in order to prevent foreign matter such as dirt and dust entering 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 .

Further, mounting holes 107 are 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 grinders), a robot, or the like with bolts. If foreign matter such as dust accumulates in the mounting hole 107, the foreign matter such as dust adheres to the rolling element raceway surface 111 of the slider 102 when the slider 102 passes over the mounting hole 107. Since smooth movement may be hindered, for example, a rail cover 108 made of metal covers the upper surface of the guide rail 101 to block the upper opening of the mounting hole 107 .

When the linear guide device 100 is assembled by mounting the slider 102 on the guide rail 101 , it is necessary to prevent the rolling elements 103 held in the slider 102 from falling off the rolling element raceway surface 111 . For this reason, the slider 102 is temporarily attached to a temporary resin shaft (not shown) formed in substantially the same shape as the guide rail 101, and this temporary shaft is arranged coaxially and linearly with the guide rail 101. , the slider 102 on the temporary shaft is moved in the axial direction so as to ride on the guide rail 101 .

At this time, a step 130 is formed between the rail cover 108 and the upper surface or side surface 101a of the guide rail 101 exposed from the rail cover 108 . Further, a step may also be formed between both axial end surfaces of the guide rail and the temporary shaft that face each other. When the slider 102 is mounted, the step 130 comes into contact with the side seal 105 and the inner seal 109, and the side seal 105 and the inner seal 109 may be damaged. Further, if the rail cover 108, the side seal 105, and the inner seal 109 interfere with each other when the slider 102 is mounted, there is a possibility that the slider 102 cannot be moved smoothly.

Patent Document 1 discloses a temporary shaft attachment for transferring a slider assembled to a temporary shaft of a linear motion guide device from the temporary shaft to a guide rail. The temporary shaft attachment is coaxially arranged at one axial end of the guide rail, forms an outer surface having a cross-sectional shape larger than that of the temporary shaft, and protrudes in the direction of the guide rail to extend in the axial direction. An extending sheet-like projection is provided at the end on the guide rail side. A plurality of slits extending in the axial direction are formed in the protruding portion so that each protruding portion can be elastically deformed inward.

As a result, the slider is moved from the temporary shaft to the guide rail while the side seals and inner seals of the slider are pressed by the protrusions extending outward. At this time, damage to the side seals and the inner seal due to a step or the like when the slider moves from the temporary shaft to the guide rail is suppressed.

Japanese Patent Application Laid-Open No. 2012-67838

However, in the temporary shaft attachment described in Patent Document 1, if the slit formed in the protruding portion is arranged on the rolling path along which the rolling element moves, depending on the position of the slit, the passing of the rolling element may cause The protrusion may deform in an unintended direction, damaging the side seals and the inner seal. Moreover, there is a possibility that the rolling elements may be damaged by passing through the edge portion of the slit.

SUMMARY OF THE INVENTION The present invention has been made in view of the circumstances described above, and an object of the present invention is to provide a linear motion guide capable of preventing breakage of seals and damage to rolling elements when moving a slider from a temporary shaft to a guide rail. To provide an attachment for a temporary shaft of a device.

The above objects of the present invention can be achieved by the following configurations.
(1) Using a temporary shaft assembled with the slider of a linear motion guide device that includes a guide rail and a slider that is relatively movable in the longitudinal direction of the guide rail via rolling elements with respect to the guide rail, When the slider is transferred from the temporary shaft to the guide rail, it is used by being mounted coaxially and in a straight line between the axial end of the temporary shaft and the axial end of the guide rail. A temporary shaft attachment for a linear motion guide device,
Of the two axial end portions, when the axial end portion on the side to be attached to the temporary shaft is defined as the temporary shaft side end portion, and the axial end portion on the side facing the axial end portion of the guide rail is defined as the rail side end portion. , the rail-side end has a shape in which the size of a cross section cut along a plane orthogonal to the axial direction smoothly increases from the temporary shaft-side end toward the rail-side end;
The cross-sectional size of the temporary shaft side end portion is equal to the cross-sectional size of the axial end portion of the temporary shaft to be attached, and the cross-sectional size of the rail side end portion is equal to the cross-sectional size of the temporary shaft side end portion. larger than the size of
The rail-side end has a plate-like protrusion that forms the outer surface of the rail-side end and protrudes in the axial direction,
The projecting portion is partitioned by a plurality of slits extending in the axial direction and formed with a plurality of elastically deformable portions each capable of elastically deforming in the thickness direction,
A temporary shaft attachment for a linear motion guide device, wherein the elastically deforming portion at a position where the rolling element passes through the outer surface is wider than the rolling surface of the rolling element.

According to the temporary shaft attachment of the linear motion guide device of the present invention, when the slider is moved from the temporary shaft to the guide rail, the rolling surface of the rolling element is prevented from passing through the edge portion of the slit, and the projection is prevented from passing through. Since deformation in an unintended direction is suppressed, breakage of the seal and damage to the rolling elements can be prevented.

FIG. 4 is a perspective view showing a state in which a slider is transferred from a temporary shaft to a guide rail using the temporary shaft attachment of the linear motion guide device according to the embodiment of the present invention; (a) is a perspective view showing a state before the temporary shaft attachment and the temporary shaft shown in FIG. 1 are assembled, and (b) is a perspective view showing a state after the temporary shaft attachment and the temporary shaft are assembled. be. It is a side view of the attachment for temporary shafts shown in FIG. It is the front view which looked at the attachment for temporary shafts shown in FIG. 3 from the axial direction. It is the front view which looked at the attachment for temporary shafts of the linear guide device which concerns on a modification from the axial direction. It is a perspective view explaining the structure of a linear guide. FIG. 7 is a front view of the linear guide device of FIG. 6 as seen from the axial direction (however, the end cap is omitted).

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of a temporary shaft attachment for a linear guide device according to the present invention will now be described in detail with reference to the drawings.
The temporary shaft attachment according to the present embodiment is used for transferring the slider assembled to the temporary shaft from the temporary shaft to the guide rail when assembling the linear guide device shown in FIGS. It is a thing. Specifically, as shown in FIG. 1, the temporary shaft attachment 40 is arranged coaxially and in a straight line between the temporary shaft 30 and the guide rail 101, and moves the slider 102 on the temporary shaft 30 to the temporary shaft. It is moved in the axial direction toward the guide rail 101 via the attachment 40 for transfer and is transferred onto the guide rail 101.例文帳に追加
The same reference numerals as those of the linear motion guide device 100 shown in FIGS. 6 and 7 are used for the configuration of the linear motion guide device, and the description thereof is omitted or simplified. The explanation will focus on the temporary shaft attachment.

The temporary shaft 30 is made of resin or metal, and has substantially the same cross-sectional shape as the cross-sectional shape perpendicular to the longitudinal direction of the guide rail 101, as shown in FIG. On the other hand, since the temporary shaft 30 is for temporarily assembling the slider 102 , the length in the axial direction may be slightly longer than the length in the axial direction of the slider 102 .
In the case of this embodiment, two rolling element raceway surfaces 31, 31 extending in the axial direction are also formed on both side surfaces of the temporary shaft 30 corresponding to the rolling element raceway surfaces 110, 110 of the guide rail 101, respectively. It is

The temporary shaft attachment 40 is also made of resin or metal, and has substantially the same cross-sectional shape as the guide rail 101 and the temporary shaft 30 over the longitudinal direction, as shown in FIGS. Furthermore, on both side surfaces of the temporary shaft attachment 40, two rolling element raceway surfaces 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41 are formed respectively.

Further, of the axial end portions of the temporary shaft attachment 40, when the axial end portion on the temporary shaft 30 side is defined as the temporary shaft side end portion 42, and the axial end portion on the guide rail 101 side is defined as the rail side end portion 43. A pair of engaging

protrusions

44, 44 that can be engaged with a pair of engaging

recesses

32, 32 formed on the axial end face of the temporary shaft 30 are formed at the left and right lower portions of the temporary shaft side end portion 42. It is

In the temporary shaft attachment 40 , the size of the cross section perpendicular to the axial direction at the rail side end portion 43 is smooth from the temporary shaft side end portion 42 toward the rail side end portion 43 , that is, toward the end surface of the rail side end portion 43 . It has a shape that grows to The cross-sectional size of the temporary shaft side end portion 42 is substantially equal to the cross-sectional size of the axial end portion of the temporary shaft 30 to be attached. On the other hand, the cross-sectional size of the rail-side end portion 43 is larger than the cross-sectional size of the temporary shaft-side end portion 42 .

Further, the temporary shaft attachment 40 is provided with thin plate-like protruding portions 47 that form the outer surface and protrude in the axial direction on the upper portion and the left and right side portions of the rail side end portion 43 . The protruding portion 47 is formed such that the outer surface gradually widens outward from the base end portion of the rail side end portion 43 toward the tip portion thereof.

A plurality of slits 49 extending in the axial direction from the tip of the rail-side end 43 are formed in the protrusion 47 . As a result, a plurality of elastically deformable portions 50 that are partitioned by a plurality of slits 49 and that are each elastically deformable in the thickness direction are formed in the projecting portion 47 .

The elastic deformation portion 50 at the position where the rolling element 103 passes over the outer surface of the temporary shaft attachment 40 is formed wider than the rolling surface of the rolling element 103 . That is, the slits 49 are formed on both sides in the width direction away from the position of the outer surface of the projecting portion 47 through which the rolling elements 103 pass.
In addition, the elastic deformation portion 50 at the position where the rolling element 103 passes through the outer surface of the temporary shaft attachment 40 is formed so that the intermediate position CL1 in the width direction coincides with the intermediate position CL2 of the rolling surface of the rolling element 103. ing.

Therefore, the engaging

concave portions

32, 32 formed at the axial ends of the temporary shaft 30 and the engaging

convex portions

44, 44 formed at the temporary shaft side end portion 42 of the temporary shaft attachment 40 are engaged. Then, the temporary shaft 30 to which the slider 102 is assembled and the temporary shaft attachment 40 are connected. Further, the axial end portion of the guide rail 101 is abutted against the rail side end portion 43 of the temporary shaft attachment 40 , so that the temporary shaft attachment 40 is aligned with the axial end portion of the temporary shaft 30 and the axial direction of the guide rail 101 . It is attached coaxially and in a straight line between the ends.

Then, as shown in FIG. 1, when the slider 102 is transferred from the temporary shaft 30 to the guide rail 101, when the slider 102 reaches the temporary shaft attachment 40, the side seals and the inner seal move to the temporary shaft attachment. Along the outer surface of 40, it expands outward gradually without strain. Then, when the slider 102 reaches the thin-plate-like projecting portion 47 , the side seal 105 and the inner seal 109 are further pushed outward along the projecting portion 47 .

Therefore, when the slider 102 moves from the temporary shaft attachment 40 to the guide rail 101, the side seal 105 and the inner seal 109 are prevented from coming into contact with the axial end face of the guide rail 101 and the end face of the rail cover 108. Damage to the side seal 105 and the inner seal 109 is suppressed. As a result, the slider 102 can be smoothly moved from the temporary shaft 30 to the guide rail 101 for assembly.

Further, the rolling elements 103 of the linear motion guide device 100 pass from the rolling element raceway surfaces 31, 31 of the temporary shaft 30 to the rolling element raceway surfaces 41, 41 of the temporary shaft attachment 40, and then the rolling elements of the guide rail 101. It rolls on the raceway surfaces 110,110. Then, the rolling elements 103 pass through the rolling element raceway surfaces 41 , 41 of the temporary shaft attachment 40 while elastically deforming the elastic deformation portion 50 inward. At this time, since the elastic deformation portion 50 at the position where the rolling element 103 passes over the outer surface is wider than the rolling surface of the rolling element 103, there is no possibility that the rolling element 103 and the edge portion of the elastic deformation portion 50 will come into contact with each other. Therefore, it is possible to reliably prevent damage to the rolling elements 103 due to the edge portion.

In addition, the elastic deformation portion 50 at the position where the rolling element 103 passes through the outer surface is formed so that the intermediate position CL1 in the width direction coincides with the intermediate position CL2 of the rolling surface of the rolling element 103. moves on the protruding portion 47, stress acts equally on each portion of the protruding portion 47 and deforms parallel to the state before elastic deformation. Therefore, deformation of the projecting portion 47 in an unintended direction is prevented, and the elastic force of the projecting portion 47 acts evenly to prevent the side seal 105 and the inner seal 109 from being damaged. The behavior of the rolling elements 103 is stabilized.

(Modification)
Next, a modified temporary shaft attachment will be described with reference to FIG.
In this modified example, as shown in FIG. 5, the temporary shaft attachment 40A of the modified example includes a guide rail (not shown) provided with two rolling element raceway surfaces on the upper surface and one on each side surface. It is used when moving the slider 102 from the temporary shaft 30 corresponding to the linear guide device provided.
Therefore, the temporary shaft (not shown) and the temporary shaft attachment 40A are also provided with one rolling element raceway surface 41 on each side surface and two rolling element raceway surfaces 41 on the upper surface.

Also in this temporary shaft attachment 40A, the rail-side end portion 43 is provided with a thin-plate-like protruding portion 47 that protrudes in the axial direction. A plurality of slits 49 extending in the axial direction from the tip of the rail-side end 43 are formed in the projecting portion 47 . As a result, a plurality of elastically deformable portions 50 that are partitioned by a plurality of slits 49 and that are each elastically deformable in the thickness direction are formed in the projecting portion 47 . The elastic deformation portion 50 at the position where the rolling element 103 passes over the outer surface of the temporary shaft attachment 40 is formed wider than the rolling surface of the rolling element 103 . As a result, the same effect as the temporary shaft attachment 40 of the above-described embodiment can be obtained even if the linear motion guide device has different specifications.

The present invention is not limited to the above embodiments and modifications, but can be modified and applied by those skilled in the art by combining each configuration of the embodiments with each other, based on the description of the specification and well-known technology. This is also contemplated by the present invention and included within the scope for which protection is sought.

For example, in the above description, an attachment for a temporary shaft of a linear guide device provided with rolling elements formed as rollers has been described, but the present invention is not limited to this, and the rolling elements may be balls, and the same applies. can be used to achieve the same effect.

As described above, this specification discloses the following matters.
(1) Using a temporary shaft assembled with the slider of a linear motion guide device that includes a guide rail and a slider that is relatively movable in the longitudinal direction of the guide rail via rolling elements with respect to the guide rail, When the slider is transferred from the temporary shaft to the guide rail, it is used by being mounted coaxially and in a straight line between the axial end of the temporary shaft and the axial end of the guide rail. A temporary shaft attachment for a linear motion guide device,
Of the two axial end portions, when the axial end portion on the side to be attached to the temporary shaft is defined as the temporary shaft side end portion, and the axial end portion on the side facing the axial end portion of the guide rail is defined as the rail side end portion. , the rail-side end has a shape in which the size of a cross section cut along a plane orthogonal to the axial direction smoothly increases from the temporary shaft-side end toward the rail-side end;
The cross-sectional size of the temporary shaft side end portion is equal to the cross-sectional size of the axial end portion of the temporary shaft to be attached, and the cross-sectional size of the rail side end portion is equal to the cross-sectional size of the temporary shaft side end portion. larger than the size of
The rail-side end has a plate-like protrusion that forms the outer surface of the rail-side end and protrudes in the axial direction,
The projecting portion is partitioned by a plurality of slits extending in the axial direction and formed with a plurality of elastically deformable portions each capable of elastically deforming in the thickness direction,
A temporary shaft attachment for a linear motion guide device, wherein the elastically deforming portion at a position where the rolling element passes through the outer surface is wider than the rolling surface of the rolling element.
According to this configuration, when the slider is moved from the temporary shaft to the guide rail, the rolling surface of the rolling element is prevented from passing through the edge portion of the elastic prefectural police portion, thereby preventing breakage of the seal and damage to the rolling element. can be smoothly moved to the guide rail.

(2) The elastic deformation portion in front of the position where the rolling element passes through the outer surface is formed so that the intermediate position in the width direction thereof coincides with the intermediate position of the rolling surface of the rolling element. An attachment for a temporary shaft of the linear motion guide device described in 1.
According to this configuration, when the rolling element passes through the elastically deformable portion, deformation in an unintended direction due to the force received by the elastically deformable portion from the rolling element is suppressed, and breakage of the seal can be suppressed. Also, the behavior of the rolling elements is stabilized.

(3) The temporary shaft attachment for a linear motion guide device according to (1) or (2), wherein the rolling elements are rollers or balls.
According to this configuration, the same effect can be obtained regardless of the shape of the rolling elements.

This application is based on a Japanese patent application (Japanese Patent Application No. 2021-055679) filed on March 29, 2021, the contents of which are incorporated herein by reference.

30

Temporary shaft

40, 40A Attachment for temporary shaft 42 Temporary shaft side end 43 Rail side end 47 Protruding portion 49 Slit 50 Elastic deformation portion 100 Linear guide device 101 Guide rail 102 Slider 103 Rolling element CL1 Width direction of elastic deformation portion Center position CL2 Intermediate position of rolling element

Claims

A temporary shaft assembled with the slider of a linear motion guide device comprising a guide rail and a slider capable of moving relative to the guide rail in the longitudinal direction of the guide rail via rolling elements is used to move the slider. When the provisional shaft is transferred to the guide rail, the straight shaft is attached so as to be coaxial and aligned between the axial end of the provisional shaft and the axial end of the guide rail. A temporary shaft attachment for a motion guide device,
Of the two axial end portions, when the axial end portion on the side to be attached to the temporary shaft is defined as the temporary shaft side end portion, and the axial end portion on the side facing the axial end portion of the guide rail is defined as the rail side end portion. , the rail-side end has a shape in which the size of a cross section cut along a plane orthogonal to the axial direction smoothly increases from the temporary shaft-side end toward the rail-side end;
The cross-sectional size of the temporary shaft side end portion is equal to the cross-sectional size of the axial end portion of the temporary shaft to be attached, and the cross-sectional size of the rail side end portion is equal to the cross-sectional size of the temporary shaft side end portion. larger than the size of
The rail-side end has a plate-like protrusion that forms the outer surface of the rail-side end and protrudes in the axial direction,
The projecting portion is partitioned by a plurality of slits extending in the axial direction and formed with a plurality of elastically deformable portions each capable of elastically deforming in the thickness direction,
A temporary shaft attachment for a linear motion guide device, wherein the elastically deforming portion at a position where the rolling element passes through the outer surface is wider than the rolling surface of the rolling element.
2. The straight line according to claim 1, wherein said elastically deforming portion at a position where said rolling element passes through said outer surface is formed such that a widthwise intermediate position thereof coincides with an intermediate position of said rolling surface of said rolling element. Attachment for temporary shaft of motion guide device.
The temporary shaft attachment for a linear motion guide device according to claim 1 or 2, wherein the rolling elements are rollers or balls.