WO2008026351A1

WO2008026351A1 - Linear guidance device with error absorption mechanism

Info

Publication number: WO2008026351A1
Application number: PCT/JP2007/059460
Authority: WO
Inventors: Masashi Konomoto
Original assignee: Thk Co., Ltd.
Priority date: 2006-08-31
Filing date: 2007-05-07
Publication date: 2008-03-06
Also published as: JP3126874U

Abstract

In a linear guidance device with an error absorption mechanism provided with an error absorption mechanism section (21) installed on a moving block (4), the error absorption mechanism section (21) comprises a table (2) for mounting a guidance object, a tubular ring (23) installed to pass through a fixing opening (2a) provided in the table (2) and being erected on the moving block (4), a fixing plate (25) installed on the side, opposite to the erecting plane of the moving block, of the tubular ring (23), elastic members (22, 24) installed between the moving block (4) and the fixing plate (25) to surround the tubular ring (23), and a means (26) for securing the fixing plate (25) to the moving block (4) through the tubular ring (23). When the fixing plate (25) is not secured, a clearance S exists between the fixing plate (25) and the tubular ring (23). With such an arrangement, a linear guidance device having an error absorption function and aligning properties can be attained.

Description

Specification

Linear guide device with error absorbing mechanism

Technical field

[0001] The present invention relates to a linear guide device having an error absorbing mechanism.

Background art

Conventionally, a track rail fixedly installed on a base, a moving block configured to be movable along the track rail, and rolling while applying a load between the track rail and the moving block. A linear guide device constituted by a plurality of rolling elements is known. This type of linear guide device adjusts the clearance between the track rail and the moving block as necessary, and applies appropriate preload to the rolling elements such as balls and rollers, thereby allowing the rail and moving block to move. Since it is possible to prevent rattling between them and guide the object to be guided with high accuracy, it is frequently used in fields where high-accuracy movement is required, such as machine tools.

Disclosure of the invention

Problems to be solved by the invention

[0003] However, in the conventional linear guide device, since the accuracy of the micron level is required for the mounting of the track rail, the mounting is extremely troublesome. For example, laying a pair of track rails on the mounting surface of a bed, etc., laying a table between one or more moving blocks that move along each track rail, and guiding the table linearly In the case of configuring a linear guide device, if there is a slight error in parallelism or mounting level between a pair of track rails, this error will appear as sliding resistance of the moving block.

[0004] And, in the field of pursuing the moving accuracy of the guide object such as machine tools, high accuracy is originally required for the mounting of the track rail itself. Will be accepted as indispensable. However, it is used only for the purpose of moving the guidance object, in areas where the movement accuracy of the guidance object does not matter so much, for example, for seat guidance devices used in automobile welfare vehicles, and for construction purposes. In the field of general transporting machines and the like, mounting accuracy in micron units as required in the above-mentioned field of machine tools and the like is not required, and the mounting work of the track rail has been a heavy burden.

[0005] The present invention has been created in view of a strong viewpoint, and its purpose is to provide displacement generated between the moving block and the target object, in particular, the accuracy of mounting of the track rail, to the movement of the moving block. An object of the present invention is to provide a linear guide device with an error absorbing mechanism that can reduce the influence as much as possible.

[0006] Further, another object of the present invention is that the track rail mounting work is easy, and even if there is a slight track rail mounting error, the error is absorbed and the object to be guided is detected. An object of the present invention is to provide a linear guide device with an error absorbing mechanism capable of lightly guiding an object in a straight line.

[0007] Further, another object of the present invention is to provide a linear guide device with an error absorbing mechanism capable of exhibiting a function as a floating guide by combining alignment with an error absorbing function. There is.

Means for solving the problem

In order to solve the above-described problems, a linear guide device with an error absorbing mechanism according to the present invention includes a track rail fixedly installed on a base, and a moving block configured to be movable along the track rail. An error absorbing mechanism comprising: a plurality of rolling elements that roll while applying a load between the track rail and the moving block; and an error absorbing mechanism that is installed in the moving block and exhibits an error absorbing function. A linear guide device with the error absorbing mechanism is installed in conduction with a table on which a guide object is placed and a mounting opening provided in the table, and the moving block A cylindrical ring erected on top, a mounting plate installed on a side opposite to the moving block erected surface of the cylindrical ring, and installed between the moving block and the mounting plate; And an elastic member installed so as to surround the cylindrical ring, and fixing means for fixing and installing the mounting plate to the moving block via the cylindrical ring, and the mounting plate further When not fixed, the height of the table and the elastic member is set so that a gap is created between the mounting plate and the cylindrical ring, When the mounting plate is fixed by the fixing means, the elastic member is compressed so that the gap is eliminated.

[0009] In the linear guide device with an error absorbing mechanism according to the present invention, the elastic member is installed between the moving block and the table, and between the table and the mounting plate. It can be done.

[0010] In the linear guide device with an error absorbing mechanism according to the present invention, the elastic member may be installed only between the table and the mounting plate.

[0011] In the linear guide device with an error absorbing mechanism according to the present invention, the elastic member can be installed only between the moving block and the table.

In the linear guide device with an error absorbing mechanism according to the present invention, it is preferable that the elastic member is baked and fixed to the moving block, the table, or the mounting plate. .

[0013] In the linear guide device with an error absorbing mechanism according to the present invention, the fixing means may be a bolt that is screwed into a screw hole provided in the moving block.

[0014] Further, in the linear guide device with an error absorbing mechanism according to the present invention, the elastic member and the mounting plate are configured to have substantially the same planar shape as the upper surface of the moving block.

TV, can be that.

[0015] Furthermore, in the linear guide device with an error absorbing mechanism according to the present invention, the elastic member and the mounting plate are formed in a circular shape substantially concentric with the cylindrical shape of the cylindrical ring.

TV, can be that.

The invention's effect

[0016] According to the linear guide device with an error absorbing mechanism according to the present invention, the displacement generated between the moving block and the guide object, in particular, the influence of the mounting accuracy of the track rail on the movement of the moving block as much as possible. Can be reduced.

[0017] Further, according to the linear guide device with an error absorbing mechanism according to the present invention, it is easy to mount the track rail, and even if there is a slight track rail mounting error, By absorbing this error, it is possible to guide the guide object straightly.

[0018] Further, according to the linear guide device with an error absorbing mechanism according to the present invention, the error absorbing function has a calorie. Since it is also self-aligning, it can also function as a floating guide.

Brief Description of Drawings

FIG. 1 is an external perspective view illustrating an embodiment of a linear guide device with an error absorbing mechanism according to the present embodiment.

FIG. 2 is an exploded perspective view of components for explaining a specific configuration of the linear guide device with an error absorbing mechanism shown in FIG. 1.

FIG. 3 is a partially broken perspective view for explaining a drive mechanism of the linear guide device with an error absorbing mechanism according to the present embodiment.

[4A] FIG. 4A is a longitudinal sectional side view for explaining the configuration of the linear guide device with an error absorbing mechanism according to the present embodiment, and particularly shows a state in which the mounting plate is not fixed.

4B] FIG. 4B is a longitudinal sectional side view for explaining the configuration of the linear guide device with an error absorbing mechanism according to the present embodiment, and particularly shows a state in which the mounting plate is fixed by the fixing means. Yes.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, preferred embodiments for carrying out the present invention will be described with reference to the drawings. The following embodiments are not intended to limit the invention according to each claim, and are also described in the embodiments! All combinations of features are essential to the solution of the invention. Not exclusively.

FIG. 1 is an external perspective view illustrating an embodiment of a linear guide device with an error absorbing mechanism according to the present embodiment. FIG. 2 is an exploded perspective view of parts for explaining a specific configuration of the linear guide device with an error absorbing mechanism shown in FIG. The linear guide device with an error absorbing mechanism according to the present embodiment shown in FIGS. 1 and 2 includes, for example, a seat guide device used in a car welfare vehicle, a machine tool such as a machining center, a lathe, a milling machine, Used in robots such as component mounters for mounting components on electrical circuit boards, semiconductor and liquid crystal manufacturing equipment such as dicers and wire bonders, and realized that table 2 moves linearly or curvedly with respect to base 1. And [0022] A long and narrow track rail 3 is fixedly installed on the base 1. A track-shaped moving block 4 is attached to the track rail 3 so as to be slidable along the track rail 3. On the upper surface of the moving block 4, an error absorbing mechanism portion 21 that exhibits an error absorbing function is installed. By the action of the error absorbing mechanism portion 21, a guide object to be installed on the moving block 4 and the table 2 is provided. Thus, the influence of the displacement generated between them and the mounting accuracy of the track rail 3 on the movement of the moving block 4 can be reduced as much as possible. In this embodiment, two track rails 3 and 3 and two moving blocks 4 and 4 are provided. Of course, the number of track rails 3 and the number of moving blocks 4 depend on the use conditions and the use environment. Various settings can be made according to the above.

A plurality of balls 5 are installed as rolling elements between the track rail 3 and the moving block 4 so that the moving block 4 can slide lightly. The plurality of balls 5 is a member that rolls while applying a load between the track rail 3 and the moving block 4, and the ball rolling groove 3 a that extends along the track rail 3 and the moving block 4. Rolls between the ball rolling groove 4a 'formed opposite to the ball rolling groove 3a'. Here, the details of the drive mechanism of the linear guide device with error absorbing mechanism constituted by the track rail 3 and the moving block 4 will be described with reference to FIG.

FIG. 3 is a partially broken perspective view for explaining the drive mechanism of the linear guide device with an error absorbing mechanism according to the present embodiment. As described above, the linear guide device with an error absorbing mechanism according to the present embodiment includes the track rail 3 that is elongated in a straight line, and the moving block 4 that is slidably mounted relative to the track rail 3. A plurality of balls 5 as rolling elements capable of rolling motion are installed between the track rail 3 and the moving block 4.

[0025] On the left and right side surfaces of the track rail 3, for example, two ball rolling grooves 3a, 3a extending along the longitudinal direction are formed. These ball rolling grooves 3a and 3a extend parallel to each other along the longitudinal direction of the track rail 3.

On the other hand, the moving block 4 includes a central portion 11 that faces the upper surface of the track rail 3 and side wall portions 12 that extend downward from the left and right sides of the central portion 11 and face the left and right side surfaces of the track rail 3. Yes. The moving block 4 has a pair of side covers 13 and 13 at both ends in the moving direction. Yes. Two load ball rolling grooves 4a and 4a are formed on the side wall 12 of the moving block 4 so as to face the ball rolling grooves 3a and 3a of the track rail 3. The load ball rolling grooves 4a and 4a are In total, four strips are provided above and below the left and right side wall sections 12 and 12, respectively. These load ball rolling grooves 4a and 4ai are arranged in parallel with each other.

[0027] In the side wall 12 of the moving block 4, two upper and lower two ball return passages 14, 14 provided in parallel with a predetermined distance from the upper and lower two load ball rolling grooves 4a, 4a, and the load ball A U-shaped direction change path (not shown) is provided for connecting the end of the rolling groove 4a and the end of the ball return passage 14 to circulate the balls 5. These loaded ball rolling grooves 4a, a pair of direction changing paths, and a ball return path 14 constitute a circuit-shaped ball circulation path.

[0028] It should be noted that a screw hole 15 for installing the error absorbing mechanism portion 21 is provided in a substantially central portion of the upper surface of the central portion 11 of the moving block 4, and a screw hole 15 is provided on the inner peripheral surface of the screw hole 15. The groove is cut and a fixing means such as a bolt can be screwed.

[0029] The plurality of balls 5 are arranged and accommodated in a ball circulation path, and can be connected in series via a ball retainer.

[0030] The side lid 13 is configured to match the cross-sectional shape of the moving block 4. Further, the side cover 13 is formed with an outer peripheral side of the direction changing path, and further, a lubricant supply passage for supplying the lubricant to the load ball rolling groove of the block body is provided.

[0031] When the moving block 4 moves relative to the track rail 3, the ball 5 ... receives a load between the ball rolling groove 3a of the track rail 3 and the load ball rolling groove 4a of the moving block 4. It will move by rolling force S. The ball 5 moved to one end of the load ball rolling groove 4a of the moving block 4 passes through one direction change path, the ball return path 14, and the opposite direction change path, and then again loads in the load area. Enter ball rolling groove 4a. As described above, even when the ball 5 shifts from the no-load region to the load region, slight vibration is generated. However, the error absorbing mechanism unit 21 according to the present embodiment, which will be described later, detects this slight vibration. Absorbing effect is also demonstrated.

Next, with reference to FIG. 1, FIG. 2, FIG. 4A, and FIG. 4B, the most characteristic error absorbing mechanism 21 in the linear guide device with error absorbing mechanism according to the present embodiment will be described. Here, FIG. 4A is a longitudinal section for explaining the configuration of the linear guide device with an error absorbing mechanism according to the present embodiment. It is a surface side view and has shown the state where the plate for attachment is not being fixed especially. FIG. 4B is a longitudinal sectional side view for explaining the configuration of the linear guide device with an error absorbing mechanism according to the present embodiment, and particularly shows a state in which the mounting plate is fixed by the fixing means.

As shown in FIG. 1, FIG. 2, FIG. 4A, and FIG. 4B, the error absorbing mechanism section 21 according to the present embodiment is installed on the upper surface of the moving block 4. The constituent members of the error absorbing mechanism section 21 are electrically connected to the table 2 for placing the object to be guided and the mounting opening 2a provided in the table 2 and on the moving block 4. The cylindrical ring 2 3 installed upright, the mounting plate 25 installed on the opposite side of the moving block standing surface of the cylindrical ring 23, installed between the moving block 4 and the mounting plate 25, and The elastic members 22, 24 are installed so as to surround the cylindrical ring 23, and the bolts 26 are used as fixing means for fixing the mounting plate 25 to the moving block 4 through the cylindrical ring 23.

[0034] The table 2 is a flat plate-shaped member for linearly guiding a guide object, and is stretched over two moving blocks 4 installed. Further, it is made of a material having a predetermined rigidity corresponding to the weight of the guidance object.

[0035] At the installation position of the moving block 4 of the table 2, an opening 2a for attachment is installed.

The force that causes the cylindrical ring 23 to conduct through the opening hole 2 a is formed so that the diameter of the opening hole 2 a is larger than the outer diameter of the cylindrical ring 23. By varying the diameters in this way, the table 2 can perform a stable linear guide without colliding with the cylindrical ring 23.

The cylindrical ring 23 installed in conduction with the opening hole 2 a of the table 2 is erected on the movable block 4 on the lower surface side. On the other hand, a mounting plate 25 is arranged on the upper surface side of the cylindrical ring 23. Elastic members 22 and 24 are disposed between the moving block 4 and the table 2 and between the table 2 and the mounting plate 25, respectively.

Here, as shown in FIG. 4A, the error absorbing mechanism portion 21 according to the present embodiment has a gap between the mounting plate 25 and the cylindrical ring 23 when the mounting plate 25 is not fixed. The height of the table 2 and the elastic members 22 and 24 are set so that S is generated. Then, as shown in Fig. When the plate 25 is securely fixed, the elastic members 22 and 24 are compressed so that the gap S is eliminated. The reason for this configuration is to ensure that the elastic members 22 and 24 can exhibit their heel performance regardless of the attachment. In other words, the mounting plate 25 does not approach the moving block 4 more than the height of the cylindrical ring 23 by contacting the cylindrical ring 23 no matter how much the bolt 26 is tightened. The elastic members 22, 24 will not be crushed more than necessary, and the heel performance will not be lost. Also, this configuration has the advantage that the exact same performance can be obtained at any time, no matter who tightens the bolt 26. Therefore, the error absorbing mechanism portion 21 according to the present embodiment exhibits a desired error absorbing function by adjusting the distance of the gap S provided between the mounting plate 25 and the cylindrical ring 23. Can be obtained.

[0038] Further, since the fastening force of the bolt 26 is applied to the mounting plate 25, the moving block 4, and the cylindrical ring 23 sandwiched between these members, these members are made of a highly rigid material, for example, It is preferable to be constituted by a metal material. In particular, since the pressing force of the elastic members 22 and 24 is applied to the cylindrical ring 23 from the lateral direction not only from the fastening force of the bolts 26 from the vertical direction, it is possible to select a material and shape corresponding to the external force. is necessary.

[0039] For the elastic members 22, 24, it is preferable to use a member such as rubber. The elastic members 2 and 24 may be in contact with the moving block 4, the table 2, or the mounting plate 25, but may be in contact with each other. You may make it do. By fixing the elastic members 22 and 24 to these members by baking, it is possible to provide not only an error absorbing function but also alignment, so that the linear guide device with an error absorbing mechanism according to this embodiment is a floating guide. As a result, it will be possible to demonstrate its functions as well.

[0040] In the error absorbing mechanism portion 21 according to the present embodiment, two elastic members 22, 24 are prepared, and between the moving block 4 and the table 2 and between the table 2 and the mounting plate 25. It was made to install in. However, the installation conditions of the elastic member are not limited to those described above, and the elastic member 24 may be installed only between the table 2 and the mounting plate 25, or the moving block 4 and Install elastic member 22 only between table 2 You can do it. As described above, even if only one elastic member is used, the effect is reduced as compared with the case where only two elastic members are used, but the displacement generated between the moving block 4 and the guide object installed on the table 2, particularly the track rail 3 The effect of this embodiment that the influence of the mounting accuracy on the movement of the moving block 4 can be reduced as much as possible.

[0041] Further, according to the above-described linear guide device with an error absorbing mechanism according to the present embodiment, the mounting work of the track rail 3 is easy, and there is a slight track rail mounting error. Even so, it is possible to absorb the error and guide the guidance object in a straight line.

[0042] Although the preferred embodiments of the present invention have been described above, the technical scope of the present invention is not limited to the scope described in the above embodiments. Various modifications or improvements can be covered in the above embodiment.

For example, in the above-described embodiment, the case where the shapes of the elastic members 22 and 24 and the mounting plate 25 are configured to be substantially the same planar shape as the upper surface of the moving block 4 has been described as an example. The reason for this is that by installing the elastic members 22 and 24 over the entire upper surface of the moving block 4, stable error absorption and alignment functions can be exhibited. However, the shapes of the elastic members 22, 24 and the mounting plate 25 are not limited to the illustrated planar shapes, and any shapes can be adopted. For example, the elastic members 22 and 24 and the mounting plate 25 are preferably configured to have a circular shape substantially concentric with the cylindrical shape of the cylindrical ring 23. In this way, by making the elastic members 22, 24 and the mounting plate 25 concentric with the cylindrical ring 23, an error capable of exhibiting the same elasticity and alignment in all 360 ° directions. A linear guide device with an absorption mechanism is realized.

In the above-described embodiment, the case where the ball 5 is used as a plurality of rolling elements has been described as an example, but rolling elements of other shapes such as rollers may be used.

[0045] Further, in the above-described embodiment, any other fastening-fixing means such as force caulking fixing described by exemplifying the case where the bolt 26 is used as the fixing means used in the error absorbing mechanism portion 21 is adopted. Is possible. It is obvious that the form in which such changes or improvements are made can also be included in the technical scope of the present invention, and the descriptive power of the claims.

Claims

The scope of the claims

[1] A track rail fixed to the base,

A moving block configured to be movable along the track rail;

A plurality of rolling elements that roll while applying a load between the track rail and the moving block;

An error absorbing mechanism portion that is installed in the moving block and exhibits an error absorbing function; and a linear guide device with an error absorbing mechanism comprising:

The error absorbing mechanism section is

A table for placing guidance objects;

A cylindrical ring installed in conduction with an opening hole for mounting provided in the table and standing on the moving block;

A mounting plate installed on the opposite side of the moving block standing surface of the cylindrical ring, and an elastic plate installed between the moving block and the mounting plate and surrounding the cylindrical ring Members,

Fixing means for fixing and mounting the mounting plate on the moving block via the cylindrical ring;

In addition,

When the mounting plate is not fixed, the height of the table and the elastic member is set so that a gap is generated between the mounting plate and the cylindrical ring,

The linear guide device with an error absorbing mechanism, wherein the elastic member is compressed to eliminate the gap when the mounting plate is fixed by the fixing means.

[2] In the linear guide device with an error absorbing mechanism according to claim 1,

The linear guide device with an error absorbing mechanism, wherein the elastic member is installed between the moving block and the table and between the table and the mounting plate.

[3] In the linear guide device with an error absorbing mechanism according to claim 1, The linear guide device with an error absorbing mechanism, wherein the elastic member is installed only between the table and the mounting plate.

[4] In the linear guide device with an error absorbing mechanism according to claim 1,

The linear guide device with an error absorbing mechanism, wherein the elastic member is installed only between the moving block and the table.

[5] In the linear guide device with an error absorbing mechanism according to claim 1,

The linear guide device with an error absorbing mechanism, wherein the elastic member is fixed by baking to the moving block, the table or the mounting plate.

[6] In the linear guide device with an error absorbing mechanism according to claim 1,

The linear guide device with an error absorbing mechanism, wherein the fixing means is a bolt that is screwed into a screw hole provided in the moving block.

[7] The linear guide device with an error absorbing mechanism according to any one of claims 1 to 6, wherein the elastic member and the mounting plate are configured to have substantially the same planar shape as an upper surface of the moving block. A linear guide device with an error absorbing mechanism.

[8] The linear guide device with an error absorbing mechanism according to any one of claims 1 to 6, wherein the elastic member and the mounting plate are formed in a circular shape substantially concentric with a cylindrical shape of the cylindrical ring. A linear guide device with an error absorbing mechanism.