JP2542192Y2 - Linear motion rolling guide unit - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention is applied to sliding parts of machine tools, various types of precision processing equipment, test equipment, etc., and is used for a track rail having a track groove, a slider having a track groove, and between each track groove. The present invention relates to a linear motion rolling guide unit having a number of rolling elements that roll.

[0002]

2. Description of the Related Art Conventionally, a linear motion rolling guide unit has a relatively heavy device mounted thereon and guides the vehicle forward and backward over a relatively long distance with high precision. A dynamic rolling guide unit and the like have been proposed. FIG.
Is a perspective view showing an example of a conventional linear motion rolling guide unit,
FIG. 10 is a perspective view showing the relationship between a slider and a track rail in the linear motion rolling guide unit of FIG. 9, and FIG.
11 is a sectional view of the linear motion rolling guide unit of FIG.

As shown in FIG. 9, a linear motion rolling guide unit is provided on a bed 20 in parallel with track rails 2 and 2 in two rows.
And a plurality of sliders 1 on each track rail 2, 2.
The slide table 4 is fixed to the slider 1, and various devices mounted on the slide table 4 are moved along the track rails 2 and 2 (in the direction of arrow G). In the linear motion rolling guide unit, the track groove 5 is formed on both longitudinal side surfaces 21 of the track rail 2,
A slider 1 is slidably mounted on the track rail 2.

[0004] As shown in FIGS. 10 and 11, the slider 1 is slidable relative to the track rail 2 and faces a casing 3 having a track groove 7 formed at a position facing each track groove 5. End caps 6 attached to the sliding direction of the rolling elements 9 such as a large number of balls and the like which are relatively movable by rolling between the raceway grooves 5 and 7, that is, the end caps 6 attached to both ends in the longitudinal direction, and the moving direction of the end caps 6. The end face has a side seal 11. The track rail 2 is inserted into each lower surface of the casing 3 and the end cap 6 so that the casing 3 and the end cap 6 are connected to the track rail 2.
Each of the rail insertion recesses 10 sliding on the top is formed. Further, although not shown, a retaining band is attached to the casing 3 so as to surround the rolling elements 9 in order to prevent the rolling elements 9 from falling off the casing 3.

[0005] The end cap 6 is provided with a side seal 11 for achieving a seal between the track rail 2 and the slider 1, and is provided on a sliding surface between the track rail 2 and the slider 1 (not shown). Grease nipples are installed to supply lubricant. The end cap 6 is attached to both end surfaces of the casing 3 by penetrating screws and the like into a plurality of attachment holes, and the end cap 6 has a rail insertion recess 10 formed on the lower surface thereof so that the track rail 2 is inserted across the track rail 2. A track groove 5 which forms a sliding surface between the rolling element 9 and the track rail 2 and a direction change path for turning the rolling element 9 for circulation of the rolling element 9 are formed on both sides.

The slider 1 is mounted so as to straddle the track rail 2 and slides freely with the interposition of a rolling element 9 composed of a plurality of balls circulating along the track groove 5 of the track rail 2. Things. That is, the rolling elements 9 in the load region running in the track groove 5 of the track rail 2 are guided to the direction change path formed in the end cap 6, and further, the return path formed parallel to the track groove 7 of the casing 3. 8 and a large number of rolling elements 9 circulate infinitely in an infinite circulation path. Thus, the track groove 7 formed in the slider 1
Due to the rolling of the loaded rolling element 9 located between the track rail 5 and the track groove 5 of the track rail 2, the track rail 2 and the slider 1 can slidably move relative to each other.

In the linear motion rolling guide unit shown in FIG. 9, each track and the rolling element 9 are mainly required to support radial loads and moment loads in the vertical and horizontal directions acting via the slider 1 in each direction. The engagement is performed in a state where the internal clearance is zero or a preload is applied. Since this linear motion rolling guide unit has the above configuration, if there is an error in the parallelism of the track rails 2, the load applied when the slider 1 slides increases, and the life of the linear motion rolling guide unit decreases, Changes in sliding resistance and the like occur, resulting in significant effects on accuracy and performance. For this reason, not only the number of assembling steps for improving the accuracy of the parallelism of the track rail 2 is remarkably increased, but also the high accuracy of several tens of microns or less over the entire length of the track rail 2 having a length of several meters. Fixing the track rails 2 in parallel is a difficult task almost impossible to cope with.

[0008]

In the linear motion rolling guide unit as described above, when the track rail 2 is fixed to the bed 20, the sliding surface or upper surface 19 of the track rail 2 is moved from the mounting surface or lower surface 12 to the bed 20. , A mounting hole 15 is formed, and the mounting hole 15 is aligned with a screw hole provided in the bed 20. A bolt is passed through the mounting hole 15 and screwed into the screw hole to fix the track rail 2 to the bed 20. (See FIG. 9). In this case, when the linear motion rolling guide unit is applied to a processing machine such as a woodworking processing machine or a food machine, the slider 1 of the linear motion rolling guide unit is externally provided.
There is a risk that foreign matter may enter the inside. In such an environment, attempts have been made to increase the sealing performance between the track rail 2 and the slider 1, but generally, as shown in FIGS. Embedding has been done.

FIG. 6 is a perspective view showing the plug, FIG. 7 is a cross-sectional view showing a state in which the plug is filled in the recess of the track rail formed above the head of the bolt, and FIG. 8 protrudes from the upper surface of the track rail. It is sectional drawing which shows the state which cut the plug. After inserting and embedding the bolt 18 in the mounting hole 15 through which the bolt formed in the track rail 2 penetrates, a resin or an aluminum alloy is inserted into the remaining recess of the mounting hole 15 formed above the upper surface of the bed 20 of the bolt 18. Plug 14 which is a filler such as copper or the like is embedded.

That is, when the track rail 2 is fixed to the bed 20 with bolts 18, the bolts 18 are passed through the mounting holes 15 formed in the track rail 2, and the bolts 18 are screwed into mounting screw holes 28 formed in the bed 20. Enter and tighten,
The track rail 2 is fixed to the bed 20. When the plug 14 is embedded in the mounting hole 15 of the track rail 2, as shown in FIG. 7, since the upper part of the plug 14 protrudes from the upper surface 19 of the track rail 2, as shown in FIG.
As shown in the figure, the upper surface 19 of the track rail 2 and the plug 14
Is performed to make the same upper surface as the upper surface. That is, it is formed at the same height as the upper surface 19 of the track rail 2 to improve the sealing between the side seal 11 of the slider 1 and the upper surface 19 of the track rail 2. The operation of cutting the projecting portion of the plug 14 projecting from the upper surface 19 of the track rail 2 to make the same surface by cutting is an important factor for improving the sealing performance between the track rail 2 and the side seal 11 of the slider 1. It is.

However, in the linear motion rolling guide unit in which the plug 14 is embedded in the mounting hole 15 of the track rail 2, the plug 14 is made of a material softer than the material of the track rail 2. Depending on the operator, the upper surface of the plug 14 becomes uneven, which is not preferable. That is, in the case where an uneven surface is present on the upper surface of the plug 14, in the linear motion rolling guide unit, the upper surface 19 of the track rail 2 and the side seal 1 on the slider 1 are used.
1 and the side seal 11
Is worn in a short time, the sealing performance between the side seal 11 and the plug 14 is reduced, and the life of the side seal 11 is shortened.

In order to improve the above-mentioned phenomenon, for example, there is one disclosed in Japanese Utility Model Laid-Open No. Sho 62-68021. In this publication, a rectangular thin plate is fixed on the upper surface of a track rail. However, on the upper surface of the track rail, there is no step which causes friction such as plugging. However, it is difficult to uniformly adhere to the upper surface of the track rail, and there is a problem that the thin plate surface undulates and also impairs the sealing performance.

Therefore, in order to solve the above-mentioned problem, when the track rail is mounted on the bed, the track rail is mounted from the lower surface side of the bed, and a member which becomes a protrusion on the upper surface of the track rail is eliminated. I have.
When the lower surface side of the track rail is attached to the bed, the sealing performance can be easily ensured. However, in general, the specification condition for attaching the track rail to the bed is that the track rail is inserted into the bed by inserting bolts from the upper surface of the track rail. It is to be attached to. In order to cope with these, in the production plant, it is necessary to prepare two types of track rails, one for mounting from the upper side of the track rail and the other for mounting from the lower side, for mounting the track rail to the bed, The number of parts is increased, and the parts cannot be shared, causing an increase in cost.

Therefore, an object of the present invention is to solve the above-mentioned problem. Since the track rail is mounted on the bed, a structure that can be mounted on the bed from the mounting side of the track rail, which can achieve high sealing performance, is provided. The track rail has a structure that can be changed to a structure that can be attached to the bed even from the sliding surface side by slightly processing, improving the sealing performance and realizing the common use of parts and reducing the number of parts An object of the present invention is to provide a linear motion rolling guide unit capable of reducing the manufacturing cost.

[0015]

The present invention has the following configuration to achieve the above object. That is, the present invention provides a track rail having a raceway groove on a longitudinal side surface fixed to a bed, and a raceway having a raceway groove opposed to the raceway groove and rolling elements rolling between the raceway grooves. In a linear motion rolling guide unit having a slider that reciprocates on a track rail, a mounting hole is formed in the track rail without penetrating from a mounting surface to a sliding surface. The present invention relates to a linear motion rolling guide unit wherein a thin portion having a predetermined thickness is formed between the linear motion rolling guide unit and the surface.

In the present invention, the mounting surface of the track rail is a surface of the track rail that comes into contact with the bed when the track rail is fixed to the bed, and is usually a lower surface of the track rail. The sliding surface of the track rail is
When the slider reciprocates on the track rail, the surface of the slider comes into sliding contact with the surface of the slider, and is usually the upper surface of the track rail. In addition, a bed
A base for fixing the track rail, such as a mounting table, a table or a machine base.

In the linear motion rolling guide unit, the thin portion is made of a material softer than a material constituting the track groove portion of the track rail.

In this linear motion rolling guide unit, the mounting hole is formed in a mounting screw hole.

[0019]

The linear motion rolling guide unit according to the present invention is constructed as described above and operates as follows. That is, according to the present invention, the mounting hole is formed in the track rail without penetrating from the mounting surface to the sliding surface, and a predetermined thickness is provided between the bottom of the mounting hole and the sliding surface of the track rail. When the track rail is mounted on the bed from the mounting surface side of the track rail, without processing the track rail,
In this state, a bolt can be passed from the lower surface side of the bed, and the bolt can be screwed into the mounting hole of the track rail to fix the track rail to the bed. Therefore, the sliding surface of the track rail has no irregularities such as holes or recesses, and can be maintained as a smooth surface.

When the track rail is mounted on the bed from the sliding surface side of the track rail, the thin portion of the track rail is cut to form a mounting hole on the sliding surface side of the track rail. I do. Next, a bolt can be passed from the sliding surface side of the track rail, and the bolt can be screwed into the mounting hole of the bed to fix the track rail to the bed. In this case, the sliding surface of the track rail can be finished to a smooth surface by embedding a plug in the concave portion on the top surface of the bolt.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a linear motion rolling guide unit according to the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an essential part of an embodiment of a linear motion rolling guide unit according to the present invention, and FIG. 2 is a sectional view showing an embodiment in which a track rail is fixed on a bed. In FIGS. 1 and 2,
Components having the same purpose as the components in FIG. 9 are denoted by the same reference numerals.

As shown in FIG. 1, this linear motion rolling guide unit comprises a track rail 2 having a track groove 5 on a longitudinal side surface 21 and a bed 2 for fixing the track rail 2.
0, and a slider (not shown) straddled on the track rail 2. The slider is, for example, as shown in FIGS. 10 and 11, and illustration and description thereof are omitted here. In order to make the description of the embodiment of the present invention easy to understand, when the track rail 2 is fixed to the bed 20,
The surface of the track rail 2 that abuts on the bed 20 is referred to as the mounting surface 12 of the track rail 2 and corresponds to the lower surface 12 of the track rail 2 in FIGS. When the slider reciprocates on the track rail 2, the surface of the track rail 2 on which the slider slides and contacts is referred to as a sliding surface 19 of the track rail 2, and in FIGS. Corresponds to the upper surface 19. Further, the bed 20 is a base for fixing the track rail 2,
It is a mounting table, table or machine base.

As shown in FIG. 1, the mounting hole 25 does not penetrate from the mounting surface 12 to the sliding surface 19 in the track rail 2 and the deepest portion, that is, the bottom portion 22 of the mounting hole 25 is Is formed in a thin portion 17 having a predetermined thickness L between itself and the sliding surface 19. The mounting hole 25 formed in the track rail 2 is a mounting screw hole for a female screw. The thickness L of the track rail 2 between the bottom portion 22 of the mounting hole 25 and the sliding surface 19 is such that the portion corresponding to the mounting hole 25, that is, the upper surface 19 of the thin portion 17 is not partially deformed into an uneven shape. The thickness is determined by the diameter of the mounting hole 25, the bolt tightening force, the material of the track rail 2, and the like. The thickness L of the track rail 2 is
For example, practically, it is preferable to be 5 mm or less from the spot facing. Although not shown, pores may be formed in the thin portion 17 in order to release the air so that the bolt can be easily inserted and the compressed air does not stay.

In the linear motion rolling guide unit according to the present invention, FIGS. 1 and 2 show a case where the track rail 2 is mounted on the bed 20 from the mounting surface 12 side of the track rail 2. In this embodiment, the portion corresponding to the mounting hole 25 of the track rail 2, that is, the thin portion 17 is not machined, and the thin portion 17 is left as it is.
A bolt 18 is passed through the lower surface 16 of the 0, and the bolt 18 is screwed into the mounting hole 25 of the track rail 2 to fix the track rail 2 to the bed 20. Therefore, the sliding surface 19 of the track rail 2 can maintain a smooth surface without any processing such as a hole or a concave portion.

FIG. 2 shows that the track rail 2 is
3 shows a state where the bolt 18 is tightened. Bed 2
At 0, a mounting hole 23 through which the screw portion of the bolt 18 penetrates and a large-diameter mounting hole 27 where the head 26 of the bolt 18 is located are formed. The head 26 of the bolt 18 sits on the seat surface 24 at the boundary between the mounting holes 23 and 27. The mounting hole 25 of the track rail 2 is aligned with the mounting hole 23 formed in the bed 20, and the bolt 18 is inserted from the lower surface 16 side of the bed 20 into the bed 2.
The track rail 2 is fixed to the bed 20 by inserting the bolt 18 from the mounting surface 12 side of the track rail 2 into the female screw of the mounting hole 25 of the track rail 2 and tightening it. I have. Therefore, the track rail 2
The upper surface 19 is not subjected to any processing such as holes and recesses, so that a smooth surface can be maintained, and the sealing property between the track rail 2 and the slider can be improved.

FIGS. 3 and 4 show another embodiment of the linear motion rolling guide unit. FIG. 3 is a cross-sectional view showing a state in which the sliding surface side of the track rail is counterbored, and FIG. 4 is a cross-sectional view showing a state in which the track rail is fixed on the bed from the sliding surface side of the track rail with a bolt. . In this embodiment, the sliding surface 1 of the track rail 2
The case where the track rail 2 is attached to the bed 20 from the 9 side is shown. The thin portion 17 of the track rail 2 where the mounting hole 25 is formed is subjected to a cutting process such as spot facing to form a mounting hole, ie, a spot facing portion 30 on the sliding surface 19 side of the track rail 2. Next, track rail 2
A bolt 31 can be passed through the sliding surface 19 of the above, and the bolt 31 can be screwed into the mounting screw hole 28 of the bed 20 to fix the track rail 2 to the bed 20. In this case,
Top surface 34 of bolt 31 and sliding surface 19 of track rail 2
The sliding surface 19 of the track rail 2 is finished to a smooth surface by embedding the plug 14 in the recess between them.
In this embodiment, the bolt 31 has a screw diameter smaller than the diameter of the mounting hole 25 formed in the track rail 2, that is, the mounting screw hole.

FIG. 5 shows still another embodiment of the linear motion rolling guide unit according to the present invention. In this embodiment, a portion 32 between the vicinity of the bottom 22 of the mounting hole 25 of the track rail 2 and the sliding surface 19 of the track rail 2 is
The track rail 2 is made of a material softer than the material of the track groove portion 33. That is, the portion 32 where the spot facing is applied to the track rail 2 is made of a soft material so that the spot facing can be easily performed. That is, the portion 33 forming the track groove of the track rail 2 is a hard portion, and
The portion 32 to which the spot facing is applied is a soft portion. For example, when the portion 32 to be counterbored is hardened by the heat treatment on the portion 33 of the track groove 5 of the track rail 2, only the portion 32 is tempered using a heating means such as a high-frequency coil. It can be easily made soft.

[0028]

[Effect of the Invention] The linear motion rolling guide unit according to the invention is configured as described above, and has the following effects. That is, the present invention provides a thin track rail having a predetermined thickness between the bottom of the mounting hole and the sliding surface of the track rail without the mounting hole penetrating from the mounting surface to the sliding surface in the track rail. When the track rail is mounted on the bed from the mounting surface side of the track rail, a bolt is passed from the lower surface of the bed as it is, without counterbore processing on the track rail. The bolt can be screwed into the mounting hole of the track rail to fix the track rail to the bed. Therefore, the sliding surface of the track rail can be maintained smooth without any processing of holes or the like, and the sealing performance can be greatly improved as compared with conventional ones. Wear of the side seal attached to the front end surface can be prevented.

Further, when the track rail is mounted on the bed from the sliding surface side of the track rail, the thin portion near the mounting hole of the track rail is subjected to a cutting process such as spot facing to form the track rail. A counterbore portion, that is, a mounting hole is formed on the sliding surface side of the rail. Then, a bolt can be passed through the sliding surface of the track rail, and the bolt can be screwed into the mounting hole of the bed to fix the track rail to the bed. In this case, the sliding surface of the track rail can be finished to a smooth surface by embedding a plug in the concave portion on the top surface of the bolt.

Therefore, this linear motion rolling guide unit is
In order to attach the track rail to the bed, the track rail having a structure capable of being attached to the bed from the attachment surface side of the track rail capable of realizing high sealing performance is subjected to sliding by slightly counterboring the track rail. The structure can also be changed or diverted from the moving surface side to a structure that can be attached to the bed. In addition, this linear motion rolling guide unit improves the sealing performance as compared with the conventional one, realizes the common use of parts, reduces the number of parts, significantly reduces the manufacturing cost, and significantly reduces the production management. It can be performed with one type of track rail and is easy to manage.

Since the thin portion is made of a material softer than the material forming the track groove portion of the track rail, when the thin portion is counterbored, it is easily processed. Work time can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of a track rail and a bed of an embodiment of a linear motion rolling guide unit according to the present invention.

FIG. 2 is a cross-sectional view showing one embodiment in which a track rail is fixed on a bed from the mounting surface side of the track rail with bolts.

FIG. 3 is a cross-sectional view showing a main part of another embodiment of the linear motion rolling guide unit according to the present invention, showing a state in which a sliding surface side of a track rail is spotted.

FIG. 4 is a sectional view showing another embodiment in which a track rail is fixed on a bed from a sliding surface side of the track rail with bolts.

FIG. 5 is a cross-sectional view showing a main part of still another embodiment of the linear motion rolling guide unit according to the present invention.

FIG. 6 is a perspective view showing an example of an embedding plug embedded in a track rail.

FIG. 7 is a cross-sectional view showing a state in which a plug is filled in a concave portion of a track rail formed above a head of a bolt.

FIG. 8 is a cross-sectional view showing a state where a portion of the plug that protrudes from the upper surface of the track rail has been cut into a smooth surface.

FIG. 9 is a perspective view showing an example of a conventional linear motion rolling guide unit.

FIG. 10 is a perspective view showing a relationship between a slider and a track rail in a conventional linear motion rolling guide unit.

FIG. 11 is a sectional view of the linear motion rolling guide unit of FIG. 10;

[Explanation of symbols]

 Reference Signs List 1 slider 2 track rail 3 casing 4 slide table 5, 7 track groove 6 end cap 9 rolling element 12 mounting surface (lower surface) 13 upper surface of bed 14 plug 16 lower surface of bed 17 thin portion 18 bolt 19 sliding surface (upper surface) Reference Signs List 20 Bed 21 Side face of track rail 22 Bottom of mounting hole 23 Mounting hole 25 Mounting hole 28 Mounting screw hole 30 Counterbore part 31 Bolt 32 part (soft part) 33 part (hard part)

Claims (3)

(57) [Scope of request for utility model registration] 1. A track rail having a raceway groove on a longitudinal side surface fixed to a bed, and the track having a raceway groove facing the raceway groove and a rolling element rolling between the raceway grooves. In a linear motion rolling guide unit having a slider that reciprocates on a rail, a mounting hole is formed in the track rail without penetrating from a mounting surface to a sliding surface, and a bottom portion of the mounting hole and the sliding surface are formed. A linear motion rolling guide unit, wherein a thin portion having a predetermined thickness is formed between the linear motion rolling guide unit. 2. The linear motion rolling guide unit according to claim 1, wherein the thin portion is made of a material softer than a material forming a portion of the track groove of the track rail. 3. The linear motion rolling guide unit according to claim 1, wherein the mounting hole is a mounting screw hole.