WO2012063411A1

WO2012063411A1 - Linear-guide device

Info

Publication number: WO2012063411A1
Application number: PCT/JP2011/005846
Authority: WO
Inventors: 佳佑田中
Original assignee: 日本精工株式会社
Priority date: 2010-11-10
Filing date: 2011-10-19
Publication date: 2012-05-18
Also published as: KR20130081291A; JP5928337B2; CN102612607B; JPWO2012063411A1; KR101491395B1; CN102612607A

Abstract

The purpose of the present invention is to provide a linear-guide device that is not prone to lubrication insufficiencies or leakage of lubricant from the interior of a slider to the exterior. In this linear-guide device, a lubricant-absorbing material (20) is disposed between a guide rail (1) and a slider (2), so if an excess of lubricant is supplied to the interior of the slider (2), lubricant seeping into a space between the top surface (1b) of the guide rail (1) and the inner surface (7a) of a plate-shaped part (7) of the slider (2) is absorbed. This makes it difficult for lubricant to accumulate in said space and for lubricant to leak from the interior of the slider (2) to the exterior.

Description

Linear guide device

The present invention relates to a linear guide device.

The linear guide device has a guide rail having a rolling element raceway surface extending in the axial direction on the outer surface, a rolling element raceway surface facing the rolling element raceway surface of the guide rail, and is attached to the guide rail so as to be relatively movable in the axial direction. And a plurality of rolling elements arranged to roll in a rolling element rolling path formed between the rolling element raceway surface of the guide rail and the rolling element raceway surface of the slider. The slider moves in the axial direction along the guide rail through the rolling of the rolling element. The rolling elements in the rolling element rolling path are lubricated by supplying a lubricant such as lubricating oil and grease.

However, for example, when the lubricant is excessively supplied, or when the guide rail shaft is installed on the installation surface such as a wall surface so as to be along the vertical direction, the supplied lubricant is the guide rail. There was a risk of leakage to the outside from between the slider. The lubricant leaked to the outside may travel along the outer surface of the guide rail and scatter, and as a result, there may be a problem of contaminating the environment where the linear guide device is installed.

Therefore, in order to solve such a problem, a linear guide device has been proposed in which a lubricant does not leak to the outside and contaminate the environment. For example, in the linear guide devices described in

Patent Documents

1 and 2, the lubricant leaked from between the guide rail and the slider is absorbed by the lubricant absorbing plate or the lubricant absorbing portion attached to the end in the axial direction of the slider. By doing so, the lubricant is prevented from being scattered.

Japanese Patent Publication 2001-295840A Japanese Patent Publication Gazette 2008-281061A

However, since the linear guide devices described in

Patent Documents

1 and 2 are configured to absorb the lubricant leaked to the outside of the slider, the leaked lubricant moves along the outer surface of the guide rail and moves to the lubricant absorbing plate or There was a risk that the lubricant would scatter before reaching the lubricant absorbing portion and being absorbed. In particular, when a large amount of lubricant leaks, the lubricant is likely to be scattered. Further, there is a possibility that a problem that the lubricant accumulated in the slider enters into the rail mounting hole provided in the guide rail due to excessive supply of the lubricant to the linear guide device.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a linear guide device in which the lubricant is hardly leaked from the inside of the slider to the outside and the lubricant is not insufficient. And

In order to solve the above-described problems, a linear guide device according to an aspect of the present invention includes a guide rail having a rolling element raceway surface extending in the axial direction on an outer surface, and a rolling element raceway facing the rolling element raceway surface of the guide rail. A rolling element rolling path formed between a rolling element raceway surface of the guide rail and a slider rolling element raceway surface of the guide rail and a slider attached to the guide rail so as to be relatively movable in the axial direction. A linear guide device comprising a plurality of rolling elements arranged so as to be freely rollable, wherein the lubricant absorbing material capable of absorbing and retaining the lubricant that lubricates the rolling elements and the raceway surfaces of both rolling elements is It is arranged between the guide rail and the slider.

In the linear guide device, the guide rail has a substantially square cross-sectional shape, and the lubricant absorbent is disposed between the upper surface of the guide rail and the surface of the slider facing the upper surface of the guide rail. It is preferable.

In the linear guide device, the slider includes a slider main body having the rolling element raceway surface, and end caps attached to both ends of the slider main body in the axial direction, and the rolling element is moved to the rolling element. A rolling element return path that feeds and circulates from the end point of the moving body rolling path to the start point, and the rolling element return path includes a first return path that includes a through-hole penetrating both axial end surfaces of the slider body, and the end. And a curved second return path that is formed at a portion of the cap facing the slider body and communicates with the rolling element rolling path and the first return path. It is preferable to hold between the end caps.

The linear guide device of the present invention can absorb the lubricant supplied to the inside of the slider with the lubricant absorbent, so that the lubricant is hardly leaked to the outside. Further, since the lubricant can be held by the lubricant absorbent, it is difficult for the lubricant to become insufficient.

It is a perspective view which shows the structure of one Embodiment of the linear guide apparatus which concerns on this invention. It is the front view which looked at the linear guide apparatus of FIG. 1 from the axial direction (however, the left side from the center has shown the cross section). It is the front view which looked at the linear guide apparatus of FIG. 1 from the axial direction (however, the side seal is omitted and illustrated). FIG. 2 is a perspective view showing the structure of the linear guide device of FIG. 1 (however, the slider body is omitted).

Embodiments 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 showing the structure of an embodiment of a linear guide device according to the present invention, and FIG. 2 is a front view of the linear guide device of FIG. 1 viewed from the axial direction (however, the central axis of the guide rail) The left side shows a cross section). In the following drawings, the same or corresponding parts are denoted by the same reference numerals.

A slider 2 having a substantially U-shaped cross section is assembled to a guide rail 1 having a substantially square cross section extending in the axial direction so as to be movable in the axial direction. In addition, these cross sections are the cross sections cut | disconnected by the plane orthogonal to an axial direction. The substantially square guide rail 1 having a cross-sectional shape has, as outer surfaces, both axial end surfaces and four surfaces extending in the axial direction. On the other hand, the slider 2 has

sleeve portions

6, 6 extending in the same direction from both sides of the plate-like portion 7, and the plate-like portion 7 and the

sleeve portions

6, 6 are perpendicular to each other. The shape is substantially U-shaped. The inner surface of the slider 2 is composed of an inner surface 7 a of the plate-like portion 7 and

inner surfaces

6 a and 6 a of both

sleeve portions

6 and 6, and the sectional shape of the inner surface of the slider 2 is the sectional shape of the outer surface of the guide rail 1. It is made into the shape along.

The slider 2 assembled to the guide rail 1 has the inner surface 7 a of the plate-like portion 7 of the inner surface thereof facing the one surface 1 b of the four surfaces of the guide rail 1. The

side surfaces

6a and 6a are opposed to the two

surfaces

1a and 1a adjacent to the one surface 1b, respectively. In the present invention, the surface 1 b facing the inner side surface 7 a of the plate-like portion 7 is the upper surface of the guide rail 1, the surface 1 a facing the inner side surface 6 a of the sleeve 6 is the side surface of the guide rail 1, and Of the four surfaces, a surface parallel to the upper surface 1b is defined as a lower surface. Moreover, in this invention, when a linear guide apparatus is seen from an axial direction edge part side, let both sides centering on the center axis line of the guide rail 1 be left and right. Therefore, even if the installation surface on which the linear guide device is installed is a surface facing in any direction, that is, a horizontal surface such as a floor or a ceiling, a vertical surface such as a wall surface, or Even in the case of an inclined surface, in the present invention, the surface 1 b facing the inner surface 7 a of the plate-like portion 7 is the upper surface of the guide rail 1.

The left and

right side surfaces

1a, 1a of the guide rail 1 are formed with two upper and lower inclined surfaces extending in the axial direction in a substantially C shape, and the total of the four inclined surfaces form the rolling element raceway surface 10, respectively. The guide rail 1 is provided with rail mounting holes 22 that penetrate the upper surface 1b and the lower surface of the guide rail 1.

The slider 2 includes a slider body 2A and

end caps

2B and 2B that are detachably attached to both ends of the slider in the axial direction. Further,

side seals

5 and 5 for sealing the opening of the gap between the guide rail 1 and the slider 2 are attached to both ends of the slider 2 (end surfaces of the end caps 2B). Is mounted with an under seal (not shown) that seals the opening of the gap between the guide rail 1 and the slider 2. Further, on the

inner side surfaces

6a, 6a of the left and

right sleeve portions

6, 6 of the slider body 2A, the inclined rolling

element raceway surfaces

11, 10, 10 and 10 facing the rolling

element raceway surfaces

10, 10, 10, 10 of the

guide rail

1, 11, 11, 11 are formed.

Then, between 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 slider 2, the rolling

element rolling paths

13, 13 having a substantially rectangular cross-sectional shape. , 13 and 13 are formed, and these rolling element rolling paths 13 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 rows on one side, and may be one row on one side or three rows or more, for example.

In this rolling element rolling path 13, a large number of cylindrical rollers 3 that are rolling elements are loaded so as to be able to roll, and the slider 2 moves along the guide rail 1 through the rolling of these cylindrical rollers 3. It moves in the axial direction. The type of roller is not limited to the cylindrical roller, and other types of rollers can be used. A spacer may be interposed between the cylindrical rollers 3. Further, a ball may be used as the rolling element.

Furthermore, the slider 2 has a substantially rectangular cross-sectional through-hole that penetrates in the axial direction in parallel with the rolling element rolling path 13 on the upper and lower portions of the thick portions of the left and

right sleeve portions

6 and 6 of the slider body 2A. The

linear path

14, 14, 14, 14 is provided.
The slider 2 is provided with a support column 15 that is a substantially plate-like member extending in the axial direction. On the support column 15, guide surfaces 15a and 15a for guiding one end surface of the cylindrical roller 3 are formed along the axial direction.

On the other hand, a flange 19 extending in the axial direction is integrally formed on the slider body 2A so as to protrude from the rolling element raceway surface 11, and the other end surface of the cylindrical roller 3 is axially formed by the guide surface 19a of the collar 19. You will be guided along. Therefore, the cylindrical roller 3 is interposed between the guide surface 19a of the collar 19 and the guide surface 15a of the support column 15, and is guided along the axial direction by both the guide surfaces 15a and 19a.

On the other hand, the

end caps

2B and 2B are made of, for example, an injection molded product of a resin material and have a substantially U-shaped cross section. In addition, on the left and right sides of the back surfaces of the

end caps

2B, 2B (the contact surface with the slider body 2A), a semi-doughnut-shaped curved path (not shown) having a substantially rectangular cross-sectional shape is formed in two steps. . When the

end caps

2B and 2B are attached to the slider body 2A, the rolling element rolling path 13 and the linear path 14 are communicated with each other through a curved path. The linear path 14 and the curved paths at both ends constitute a rolling element return path for sending the cylindrical roller 3 from the end point of the rolling element rolling path 13 to the starting point. The rolling element rolling path 13 and the rolling element return path Thus, a substantially annular rolling element circulation path is formed on both the left and right sides with the guide rail 1 interposed therebetween. The straight path 14 corresponds to a first return path that is a constituent element of the present invention, and the curved path corresponds to a second return path that is a constituent element of the present invention.

When the slider 2 assembled to the guide rail 1 moves in the axial direction along the guide rail 1, the cylindrical roller 3 loaded in the rolling element rolling path 13 rolls in the rolling element rolling path 13. However, it moves in the same direction as the slider 2 with respect to the guide rail 1. When the cylindrical roller 3 reaches the end point of the rolling element rolling path 13, the cylindrical roller 3 is scooped up from the rolling element rolling path 13 and sent to the curved path. The cylindrical roller 3 that has entered the curved path makes a U-turn and is introduced into the linear path 14, and reaches the opposite curved path through the linear path 14. Here, the U-turn is performed again to return to the starting point of the rolling element rolling path 13, and the circulation in the rolling element circulation path is repeated infinitely.

In the rolling element rolling path 13 in the linear guide device of the present embodiment, for example, a lubricant such as grease or oil is disposed, and the rolling element raceway surfaces 10 and 11 and the rolling element 3 are interposed via the lubricant. In contact with each other. This lubricant is additionally supplied into the rolling element rolling path 13 via a grease nipple or the like provided in the end cap 2B depending on the usage state of the linear guide device.

Such a linear guide device of the present embodiment includes a lubricant absorbent 20 capable of absorbing and retaining a lubricant. The lubricant absorbent 20 will be described with reference to FIGS. 3 is a front view of the linear guide device of FIG. 1 viewed from the axial direction (note that the side seal 5 is omitted), and FIG. 4 shows the structure of the linear guide device of FIG. FIG. 2 is a perspective view (however, the slider body 2A is omitted).

The lubricant absorber 20 is formed of a material capable of absorbing and holding the lubricant, and is held by

end caps

2B and 2B attached to both ends of the slider body 2A. The upper surface 1b of the guide rail 1 and the guide rail 1 is disposed between the inner surface of the slider 2 (the inner surface 7a of the plate-like portion 7) facing the upper surface 1b of the first plate. Specifically, a lubricant absorbent mounting hole 21 is provided in a portion of both

end caps

2B and 2B facing the upper surface 1b of the guide rail 1, and both axial ends of the lubricant absorbent 20 are fitted therein. The lubricant absorbent 20 is held.

The lubricant absorbent 20 may be disposed between the upper surface 1b of the guide rail 1 and the inner surface of the slider 2 (the inner surface 7a of the plate-like portion 7), and is not necessarily held by both the

end caps

2B and 2B. It does not have to be. Further, the method of holding the lubricant absorbent 20 on both

end caps

2B and 2B is not limited to the above method.

Further, the material of the lubricant absorbent 20 is not particularly limited as long as it can absorb and retain the lubricant. Examples of the material of the lubricant absorbent 20 include a porous material such as a sintered resin, or a fibrous material such as felt and paper. Further, the lubricant absorbent 20 may be formed by combining these materials. Furthermore, it is preferable that the material of the lubricant absorbent 20 does not absorb any lubricant.

Furthermore, the shape of the lubricant absorbent 20 is preferably a shape that can be accommodated in the space between the upper surface 1 b of the guide rail 1 and the inner surface 7 a of the plate-like portion 7 of the slider 2. Further, the lubricant absorbent 20 is disposed between the upper surface 1b of the guide rail 1 and the inner surface 7a of the plate-like portion 7 of the slider 2 so that the lubricant absorbent 20 does not hinder the relative movement of the slider 2 in the axial direction. It is preferable that it is a shape which does not contact the guide rail 1 when it accommodates in this space.

According to such a linear guide device of the present embodiment, when the lubricant absorbent 20 is disposed between the guide rail 1 and the slider 2, the lubricant is excessively supplied into the slider 2. Then, the lubricant entering the space between the upper surface 1b of the guide rail 1 and the inner surface 7a of the plate-like portion 7 of the slider 2 is absorbed. Therefore, the lubricant is less likely to accumulate in the space, and the lubricant is less likely to leak from the inside of the slider 2 to the outside. Note that the lubricant absorbing material 20 absorbs the lubricant not only when the lubricant is excessively supplied, but the lubricant is not limited to the upper surface 1 b of the guide rail 1 and the plate-like portion 7 of the slider 2. In the case of entering the space between the inner side surface 7a and the inner side surface 7a, it is absorbed by the lubricant absorbent 20.

Further, according to the linear guide device of the present embodiment, the lubricant absorbed and held by the lubricant absorbent 20 is used for lubrication of the rolling element raceway surfaces 10 and 11 and the cylindrical roller 3, so that the lubricant is insufficient. It is hard to become.
Furthermore, according to the linear guide device of the present embodiment, since the lubricant absorbent 20 is disposed in the space between the upper surface 1b of the guide rail 1 and the inner surface 7a of the plate-like portion 7 of the slider 2, the guide The space volume between the upper surface 1b of the rail 1 and the inner side surface 7a of the plate-like portion 7 of the slider 2 can be reduced. As a result, the lubricant is unlikely to accumulate in the space between the upper surface 1b of the guide rail 1 and the inner surface 7a of the plate-like portion 7 of the slider 2 where excessive lubricant has been accumulated in the prior art, and may leak out. Some lubricants themselves can be reduced.

Further, since the lubricant is unlikely to accumulate in the space between the upper surface 1b of the guide rail 1 and the inner surface 7a of the plate-like portion 7 of the slider 2, the lubricant is less likely to enter the rail mounting hole 22. As a result, the possibility that the invading lubricant overflows and leaks out of the slider 2 can be reduced.

In the case of a linear guide device of a type that does not include the support column 15 and guides the cylindrical roller 3 by means that does not use the support column 15, a space exists in the portion where the support column 15 is mounted. Instead of being disposed between the upper surface 1b of the slider 1 and the inner side surface 7a of the plate-like portion 7 of the slider 2, the lubricant absorbent 20 can be disposed in this space. Then, the lubricant absorbent 20 disposed in the space can absorb and hold the excessively supplied lubricant and prevent the lubricant from leaking to the outside.

Further, the lubricant absorbent 20 may be disposed both between the upper surface 1b of the guide rail 1 and the inner surface 7a of the plate-like portion 7 of the slider 2 and in the space where the support column 15 is present. . As a result, it is possible to more reliably absorb and hold the excessively supplied lubricant and more effectively prevent the leaking lubricant.

DESCRIPTION OF SYMBOLS 1 Guide rail 1b Upper surface 2 Slider 2A Slider main body 2B End cap 3 Cylindrical roller 7a Inner side surface 10 Rolling body raceway surface 11 Rolling body raceway surface 13 Rolling body raceway surface 14 Linear path 20 Lubricant absorber 21 Lubricant absorber attachment Hole

Claims

A guide rail having an outer raceway raceway surface extending in the axial direction; a slider having a racer raceway surface facing the rolling body raceway surface of the guide rail and attached to the guide rail so as to be relatively movable in the axial direction; A plurality of rolling elements arranged in a rolling element rolling path formed between the rolling element raceway surface of the guide rail and the rolling element raceway surface of the slider. There,
A linear guide device characterized in that a lubricant absorbing material capable of absorbing and retaining a lubricant that lubricates the rolling elements and both rolling element raceway surfaces is disposed between the guide rail and the slider.
The shape of the guide rail is a substantially square cross-sectional shape,
The linear guide device according to claim 1, wherein the lubricant absorbing material is disposed between an upper surface of the guide rail and a surface of the slider that faces the upper surface of the guide rail.
The slider includes a slider main body having the rolling element raceway surface, and end caps attached to both ends of the slider main body in the axial direction, and the rolling element is moved from the end point to the starting point of the rolling element rolling path. Has a rolling element return path to feed and circulate,
The rolling element return path is formed in a first return path including a through hole penetrating both axial end surfaces of the slider main body, and a portion of the end cap facing the slider main body, and the rolling element rolling path A curved second return path communicating with the first return path,
The linear guide device according to claim 1, wherein the lubricant absorbing material is held between both end caps.