JP2553973B2 - Linear motion guide device with ball screw and ball screw preloading method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear motion guide device with a ball screw used in a linear motion part of a machine tool, a robot or the like, and a method of applying a preload to the ball screw.

[0002]

2. Description of the Related Art A conventional linear motion guide device with a ball screw of this type is shown in FIG. 12 (see Japanese Utility Model Laid-Open No. 63-193637). That is, the slide base 100 is movably supported between the pair of track rails 101, 101, and is transferred by the ball screw shaft 102. By directly screwing the ball screw shaft 102 onto the slide base 100, the device configuration is made compact, and the height of the slide base 100 is made as low as possible to improve the stability.

Further, the side surface of the slide base 100 and the track base 10
Ball rolling grooves 10 each having two upper and lower rows on the opposing surfaces of 1, 101.
3, 104 are provided, and the ball rolling grooves 103, 10 are provided.
The sliding table 100 is smoothly moved by interposing balls 105, ...

[0004]

However, in the case of the prior art described above, the ball diameter for the linear motion guiding ball 105 is oversized than the distance between the ball rolling grooves 103 and 104 to apply a preload. However, since the ball screw portion 106 into which the integrally processed ball screw shaft 102 is screwed is a single nut structure, it is difficult to preload the ball screw ball in the axial direction. In addition, the axis of the ball screw shaft 102 has a sliding base.
Left and right ball rolling grooves 103, 04 which are supporting points for 100
It is provided at a position that is distant upward from the line connecting the
When a load is applied to the slide base 100, the ball screw
The part 106 is displaced and the ball screw shaft 102 is deformed
There was also a problem that feed accuracy deteriorates.

The present invention has been made to solve the above-mentioned problems of the prior art. The object of the present invention is to provide a linear movement guide device with a ball screw capable of applying an axial preload to the ball of the ball screw portion. Another object of the present invention is to provide a method for applying a preload to a ball screw, thereby eliminating axial backlash. Also, if the ball screw shaft acts on the slide base,
Increase the feed accuracy by avoiding the influence of weight as much as possible
There is something to do.

[0006]

In order to achieve the above object, in the present invention, a pair of rails provided in parallel with each other and a slide base movably supported between the rails. A linear guide ball rotatably interposed between ball rolling grooves provided on the side surfaces of the raceway base and the slide base, and a ball screwed into a ball screw hole provided on the slide base. A linear motion guide device with a ball screw, comprising: a screw shaft; and a ball screw ball rotatably interposed between screw grooves provided on the inner periphery of the ball screw hole and the outer periphery of the ball screw shaft. The moving table is divided into a first sliding table and a second sliding table in the axial direction, and a screw having the same pitch as the ball screw shaft is provided on the inner circumference of the ball screw hole of each of the first and second sliding tables. A groove is provided and a gap is provided between the first slide base and the second slide base to form a straight line.
Axial preload is applied to the ball screw ball by providing a phase difference between the screw grooves of the ball screw holes of the first and second slides when the ball rolling groove of the guide ball is discontinuous. It is characterized by being done. Also, the first sliding
With the table and the second sliding table in close contact with each other without any gap,
Phase difference between the thread grooves of the ball screw holes of each second slide
By providing the ball screw ball with an axial preload
Is added.

By displacing the first slide base and the second slide base in a direction in which they are separated from each other by a preload amount, a phase difference is provided between the screw grooves of the ball screw holes of the first and second slide bases. A preload may be applied, or the first sliding base and the second sliding base may be displaced in the directions in which they approach each other by a preload amount so that the screw grooves of the ball screw holes of the first and second sliding bases respectively. A configuration may be adopted in which a preload is applied by providing a phase difference therebetween.

Close contact between the first and second sliding bases without any gap
In this case, the preload is applied by tightening the first and second sliding bases in a direction in which the abutting surfaces of the first sliding base and the second sliding base are in contact with each other and the contacting surfaces are pressed against each other. Due to the axial reaction force acting between the contact surfaces of the first and second sliding bases, a phase difference is provided between the screw grooves of the ball screw holes of the first and second sliding bases for the ball screw. It is preferable that the ball be configured to be preloaded in the axial direction.

Further, by providing a spacer between the first slide base and the second slide base, a phase difference is provided between the screw grooves of the ball screw holes of the first and second slide bases. Alternatively, the ball screw ball may be provided with an axial preload.

Further, the first slide base and the second slide base are axially displaced with each other by a preload adjusting screw, and a phase difference is established between the screw grooves of the ball screw holes of the first and second slide bases. By providing the ball screw, an axial preload may be applied to the ball screw ball. Then, it is preferable that the first and second sliding bases are integrally fixed by a connecting member in a state where the preload is applied.

As a preloading method, the sliding base is divided into a first sliding base and a second sliding base in the axial direction, and the first and second sliding bases are linear guide balls. Before assembling on the raceway via the center of the ball screw shaft with the facing surfaces of the first and second sliding bases in contact with each other in advance between the first and second sliding bases.
A certain angle difference is provided in the rotating direction, and then the first and second
When assembling both of the slides on the track, the angle difference in the rotation direction is set to zero to press between the contact surfaces of the first and second slides, and the first slide and the second slide It is preferable to generate a phase difference in the axial direction between the screw grooves of the ball screw holes of the slide table to apply an axial preload to the ball for the ball screw.

[0012]

In the linear motion guide device with a ball screw having the above structure, a shaft is provided on the ball for the ball screw by providing a phase difference between the screw grooves of the ball screw holes of the first sliding base and the second sliding base. A directional preload is applied. A gap between the first and second slides
To form the ball rolling groove of the linear guide ball
Even if it is in a state, the ball smoothly rolls across the gap.
It When the first and second sliding bases are in close contact with each other without any gap
The ball rolling grooves of the first and second slides are continuously formed on the
can do.

The axial preload applied to the balls for the ball screw is such that the first sliding base and the second sliding base are brought into contact with each other in a state where the facing surfaces thereof are in contact with each other, and the first contacting surfaces are pressed against each other. , The second sliding base can be tightened and applied by the axial reaction force acting between the contact surfaces of the first and second sliding bases.

Further, a spacer is provided between the first sliding base and the second sliding base, and the thickness of the spacer is changed to make the first sliding base.
The preload can also be applied by changing the axial lengths of the slide table and the second slide table.

Further, by using a preload adjusting screw, the first and second
The preload can also be applied by axially displacing between the slides.

Furthermore, a phase difference is provided between the screw grooves of the ball screw holes between the first and second sliding bases, and a preload is applied to the balls for ball screws, and the first and second slides are carried out. It is effective to integrally fix the base with a connecting member.

Further, according to the preload applying method of the present invention, when the first sliding base and the second sliding base are assembled between the raceways,
Just by tightening so that the angle difference provided in advance between the first and second sliding bases becomes zero with the opposing surfaces of the first and second sliding bases in contact with each other Only, the phase difference can be generated between the screw grooves of the ball screw holes of the first sliding base and the second sliding base, and the preload can be easily applied to the ball for the ball screw.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to illustrated embodiments. 1 to 5 showing a linear movement guide device with a ball screw according to a first embodiment of the present invention, reference numeral 1 denotes the entire linear movement guide device with a ball screw. The guide rail 2 is provided, a slide base 3 guided along the guide rail 2, and a ball screw shaft 4 as a feed screw shaft for driving the slide base 3.

The guide rail 2 has a U-shaped cross section, and is composed of the above-mentioned rails 22 and 22 and a bottom wall 23 connecting the lower ends of the rails 22 and 22.

Inner surface 22 of each track rail 22 of the guide rail
Wide recessed grooves 22b, 22b are engraved on the a, 22a over the entire length thereof, and four ball rolling grooves 4a, 4b are provided at the corners of the recessed grooves 22b, 22b, two upper and two lower grooves.
4c and 4d are provided.

The slide base 3 is divided into a first slide base 310 and a second slide base 320 in the axial direction. The first slide base 310 is a first block 311, a side cover 32 attached to one end thereof, and the second slide base 320 is a second block 3.
21 and a side lid 32 attached to one end thereof.

The slide base 3 is inserted into the recess 21 on the upper surface of the guide rail 2 and is sandwiched between the raceways 22 on the inner side surface of the guide rail 2 via the balls 6 for linear guide. Supported. Then, on both side surfaces of the first block 311 and the second block 321, ball rolling is performed over the first and second blocks 311 and 321 corresponding to the ball rolling grooves 4a, 4b, 4c and 4d of the guide rail 2. Grooves 5a, 5b, 5c, 5d are engraved, and the ball rolling grooves 4a, 5a; 4b, 5b; 4c, which face each other,
A large number of balls 6 are rotatably interposed between 5c; 4d and 5d.

Further, the first and second blocks 311 and 312
The first and second ball screw holes 81, 82 of the same pitch with which the ball screw shaft 4 as the feed screw shaft is screwed are provided in the center of the
Are formed so as to penetrate coaxially. This first and second ball
The screw holes 81 and 82 are the first and second blocks 311 and 31.
Ball rolling grooves 5a, 5b provided on both left and right sides of 2;
The central portion between 5c and 5d, in particular, the upper and lower two ball rolling grooves
On the line connecting the centers of the upper and lower spans 5a, 5b; 5c, 5d
It is provided in.

On the other hand, the first and second ball screw holes 81,
Between the ball 82 and the side surfaces of the first and second blocks 311, 321 is a first ball escape hole 6 for escaping the ball 6 in the load region corresponding to each ball rolling groove 5a, 5b, 5c, 5d.
A, 6b, 6c, and 6d are provided in two rows with a total of four rows with the ball screw hole 8 in between. This first ball escape hole 6a,
The positions of 6b, 6c and 6d are the same as those of the ball rolling grooves 5a,
It is arranged on a horizontal line passing through the centers of 5b, 5c, and 5d. A preload is applied to each ball 6.
This preload is applied to each ball rolling groove 4a, 5a; 4b, 5b;
4c, 5c; 4d, 5d is provided by pressing the ball into the gap.

Further, each ball escape hole 6a, 6b, 6c,
6d and the side surfaces of the first and second blocks 311 and 321 are provided with bolt holes 9 and 9 for attaching a table or the like to the first and second blocks 311 and 321.

On the other hand, the first and second blocks 311 and 321
The first and second ball screw holes 81 and 82 passing through the center of the first and second blocks 311 and 321 are formed with screw grooves having the same pitch over the entire length of the first and second blocks 311 and 321. The balls 5 for ball screws are the first and second blocks 311 and 321.
Infinite circulation is performed via the return tubes 10 provided in the above, and each constitutes an independent circulation path.

A preload is also applied to the balls 5 for the ball screw, so that the axial play of the ball screw shaft 4 is absorbed.

The preload of the balls for the ball screw is achieved by providing a phase difference between the screw grooves of the first and second ball screw holes 81 and 82 of the first slide base 310 and the second slide base 320. An axial preload is applied to the work balls 5.

In this embodiment, the first and second sliding bases 31
The first and second sliding bases 310 and 320 are tightened in a direction in which the abutting surfaces of the first and second sliding bases 310 and 320 are pressed against each other in a state where the facing surfaces of the first and second sliding bases 310 and 320 contact each other. By the axial reaction force acting between the contact surfaces, the first and second sliding bases 31
0,320 ball screw holes 81, 82 and ball screw shaft 4
An axial phase difference is provided between the screw grooves.

Here, the first and second blocks 311 and 32
Ball rolling grooves 4a, 5a; 4b, 5b; 4c, 5c; 4 interposed between both side surfaces of 1 and the inner surface of the guide rail 2.
The contact directions with d and 5d are the respective balls 6 and the respective ball rolling grooves 4a, 5a; 4b, 5b; 4c, 5c; 4d,
Virtual lines La, Lb, Lc, Ld connecting the contact points with 5d are
With respect to the horizontal line H passing through the center of the ball screw shaft 4, the contact structure has an outward opening shape such that the interval thereof becomes narrower toward the center of the ball screw shaft 4. And this virtual line L
The angle formed by a, Lb, Lc, Ld and the horizontal line H is approximately 45.
It is desirable to set the temperature to around.

Next, the end plate 32 is a rectangular member having substantially the same shape as the end faces of the first and second blocks 311 and 321, and an insertion hole 32a for inserting the ball screw shaft 4 is formed in the center thereof. . Then, it is attached and fixed to the first and second blocks 311 and 321 via bolt holes 32b and 32b provided on both left and right sides of the insertion hole 32a.

In the end plate 32, the load area of the linear guide ball 6 and the first ball escape hole 6 are provided.
The return passage 11a, which serves as a turning portion between a, ...
... are formed.

That is, the first return passage 11a is provided on the mounting surface of the end plate 32 to which the sliding block 31 is attached, and the balls 6, ... In the load range interposed between the sliding block 31 and the guide rail 2 are balls. Escape holes 6a, 6
It is released to b, 6c and 6d and returned to the load region again. The return passage 11 a is composed of a U-shaped return piece 13 engraved on the end plate 32.

On the other hand, a retainer 18 for retaining the balls 6 is provided between the side surface of the sliding block 31 and the inner side surface of the guide rail 2. The retainer 18 is provided with a groove 2 provided on the inner surface of the rails 22, 22 of the guide rail 2.
A plate-shaped member housed in 2b, one side of which is pressed against the side surface of the sliding block 31 and fixed by a screw or the like.

In the linear motion guide device with a ball screw having the above structure, the preload is applied to the balls for the ball screw as follows.

First, the ball screw shaft 7 is screwed into the first and second ball screw holes 81 and 82 of the first slide base 310 and the second slide base 320 via the ball screw balls 5, and ，
Before assembling both of the second slides 310 and 320 via the linear guide balls 6 ...
A predetermined angular difference θ is relatively provided in the rotational direction between the first and second sliding bases 310 and 320 in a state where the facing surfaces of the first and second sliding bases 310 and 320 are in contact with each other. Keep it.

After that, when both the first and second sliding bases 310 and 320 are assembled to the track bases 22 and 22, the first and second sliding bases 3 are set so that the angular difference θ in the rotation direction becomes zero.
10 and 320 are tightened, and the contact surfaces of the first slide base 310 and the second slide base 320 are pressed by a feed amount commensurate with the angle difference, and the screws of the first and second ball screw holes 81 and 82 are screwed. A phase difference is generated between the grooves in the axial direction, and an axial preload is applied to the ball screw ball 5.

In this way, the axial preload can be applied to the ball screw balls 5, and the axial backlash of the slide base 3 can be prevented. In addition, the ball screw holes 81, 82
Is between the left and right ball rolling grooves 5a, 5b; 5c, 5d.
Since it is provided in the center of the box, external force acts on the slide base 3.
Even so, the load is on both sides of the rails 22 and 22 and on both sides of the slide 3.
Between the ball rolling grooves on the left and right of the surface 4a, 5a; 4b, 5b; 4
c, 5c; 4d; supported by the ball 6 between 5d, the ball
The screw shaft 7 is not affected. Therefore, the ball screw shaft 7
Maintains its straightness without being deformed, allowing the slide base 3 to move smoothly.
Can be sent, which means that
It is possible to improve the feed accuracy in the axial direction due to dust.

In the above embodiment, the opposing surfaces of the first and second sliding bases 310 and 320 screwed onto the ball screw shaft 4 are tightened so as to press each other, and the ball screw ball 5 is axially attached. Although the preload is applied, the present invention is not limited to such a configuration, in short, the first slide base 310 and the second slide base 310
If a phase difference is provided between the screw grooves of the ball screw holes 81 and 82 of the slide base 320, an axial preload can be applied to the ball screw ball 5.

6 to 11 show the second to fifth embodiments of the present invention.
An example is shown. Hereinafter, the same components as those in the first embodiment will be described with the same reference numerals.

In the second embodiment shown in FIG. 6, a spacer 200, which is thicker by a preload amount, is interposed between the first and second sliding bases 310 and 320 to preload the ball screw balls 5. This is a so-called "tensile preload" type in which a tensile load is applied to the first and second sliding bases 310 and 320.

That is, the spacer 200 allows the first and second
By pressing the sliding bases 310 and 320 in the axially separated directions, the first and second sliding bases 310 and 320 are pressed.
In this configuration, a phase difference is provided between the screw grooves of the ball screw holes 81, 82 to apply a preload in the axial direction to the ball screw ball 5.

Further, in the third embodiment shown in FIGS. 7 to 9, at least one of the first slide base 310 and the second slide base 320 is used. In the illustrated example, the first slide base 310 is used. The preload adjusting screw 210 is screwed in in the axial direction, and the end face of the other second sliding base 320 is pressed and displaced by the tip of this preload adjusting screw 210 to displace the first and second sliding bases 310, 32.
A gap g in the axial direction is provided between the first and second sliding bases 31.
By providing a phase difference between the screw grooves of the ball screw holes 81 and 82 of 0 and 320,
It is configured to apply an axial preload to the.

The preload adjusting screw 210 is, in the illustrated example,
Two screw holes 211 and 211 are symmetrically formed through the first block 311 of the first slide base 310 around the ball screw hole 81, and the preload adjusting bolts 210 and 210 are screwed into the screw holes 211 and 211. I have to. The preload adjusting bolt 210 is a hexagon socket head cap screw in this embodiment, and the head of the bolt is set to be recessed in the screw hole 211.
On the other hand, an adjustment window 212 is opened in the end plate 32 coaxially with the bolt hole 211.
It is possible to insert a tool such as a hexagon wrench through 2 and tighten the preload adjusting bolt 210.

In this third embodiment, however, by screwing the left and right preload adjusting bolts 210, the tip of the preload adjusting bolt 210 presses the end surface of the other second slide base 320, and the preload adjusting bolt 210 is pressed. Through the first and second
The slide bases 310 and 320 are pressed in the axially separating direction to adjust the preload.

Then, after adjusting the preload, as shown in FIG. 9, the upper plate 220 as a connecting member is fixed to the upper surfaces of the first and second slides 310 and 320 by fixing bolts 221.

In the third embodiment, however, the preload adjusting bolt 210 is used to axially separate the first and second sliding bases 310 and 320 to adjust the preload, and then the first and second sliding bases are adjusted. The upper plate 220 is connected and fixed between the moving bases 310 and 320, but the first and second sliding bases 310 and 32 are
A force is applied in the direction of axial separation between 0 and the first and second
Ball screw holes 81 of the slides 310 and 320,
A phase difference may be formed between the screw grooves of 82, and the upper plate 220 may be connected and fixed between the first and second sliding bases 310 and 320 in a state where a preload is applied.

In the fourth embodiment shown in FIGS. 10 and 11,
A spacer 200 ', which is thin by a preload amount, is interposed between the first and second sliding bases 310 and 320 to apply a preload to the ball screw ball 5, and the first and second sliding bases are provided. 310, 3
20 is a so-called "compression preload" type in which a compressive load is applied. That is, the first sliding base 310 and the second sliding base 32
0, at least one of the slides, the first in the illustrated example
A through hole 213 is provided in the sliding base 310 in the axial direction, while the second
The preload adjusting bolt 2 is screwed into the screw hole 214 provided in the slide base 320.
15 is screwed into the screw shaft 215a, and the first sliding base 310 is moved to the second sliding base 32 by a bolt head 215b that abuts the bolt seat 213a of the through hole 213 of the first sliding base 310.
The ball is pulled by pulling in a direction approaching 0 until it comes into contact with the spacer 200 ', and a phase difference is provided between the screw grooves of the ball screw holes 81 and 82 of the first and second slides 310 and 320, respectively. The screw ball 5 is configured to be preloaded in the axial direction.

The preload adjusting bolt 210 is a hexagon socket head cap bolt in this embodiment, and the bolt head 215b has a bolt seat portion 2.
It is adapted to engage with 13a. On the other hand, in the end plate 32, the adjustment window 21 is coaxial with the through hole 213.
2 is opened, and a tool such as a hexagon wrench can be inserted through the adjustment window 212 to tighten the preload adjustment bolt 215.

In the fourth embodiment, however, by screwing the left and right preload adjusting bolts 215, the tips of the preload adjusting bolts 215 are screwed into the screw holes 214 of the other second slide base 320, and the preload adjusting bolts 215 are screwed. The preload is adjusted by pressing the first and second slide bases 310 and 320 in the axially approaching direction via 215.

After adjusting the preload, the upper plate 220 as a connecting member is fixed to the upper surfaces of the first and second sliding bases 310 and 320 with fixing bolts 221 as in the configuration shown in FIG. Then, it is exactly the same as the above-mentioned third embodiment.

In this embodiment, the spacer 200 'is interposed, but a gap may be opened without using the spacer 200'.

Further, without using such a preload adjusting bolt 215, a force is applied between the first and second sliding bases 310 and 320 in a direction to bring them closer to each other in the axial direction, and the first and second sliding bases 31.
A phase difference is formed between the screw grooves of the ball screw holes 81 and 82 of 0 and 320, and the upper plate 220 connects and fixes the first and second sliding bases 310 and 320 with a preload applied. Of course, you can do it.

[0054]

EFFECTS OF THE INVENTION The present invention has the above-mentioned structure and action, and by providing a phase difference between the screw grooves of the ball screw holes of the first sliding base and the second sliding base formed at the same pitch. A preload in the axial direction can be applied to the ball for the ball screw, and axial backlash of the slide table can be prevented. Especially, if a gap is formed between the first and second sliding bases,
Make the ball rolling groove of the linear guide ball discontinuous
However, the ball smoothly rolls over the gap. Also,
If the first and second slides are closely contacted without any gap,
1, The ball rolling groove of the second slide should be connected continuously.
Can be.

Further, according to the preload applying method of the present invention, when the first sliding base and the second sliding base are assembled between the raceways,
A preload can be easily applied to the ball for the ball screw simply by tightening the first sliding base and the second sliding base in contact with each other so that the angular difference in the rotational direction becomes zero.

[Brief description of drawings]

FIG. 1 (a) is a vertical cross-sectional view of a linear motion guide device with a ball screw according to a first embodiment of the present invention, and FIG. 1 (b) is a schematic cross-sectional view of a preloading state of a ball screw. .

FIG. 2 is a schematic diagram showing a preloading method of the apparatus of FIG.

3 is a partially cutaway plan view of the apparatus of FIG.

4 is a vertical cross-sectional view of the device of FIG. 1 in a direction orthogonal to the ball screw axis.

5 is a schematic perspective view of the device of FIG.

FIG. 6 (a) is a vertical cross-sectional view of a linear motion guide device with a ball screw according to a second embodiment of the present invention, and FIG. 6 (b) is a schematic cross-sectional view of a preloading state of the ball screw. .

FIG. 7 is a partially cutaway plan view of a linear movement guide device with a ball screw according to a third embodiment of the present invention.

8 is a vertical cross-sectional view of the device of FIG. 7 in a direction orthogonal to the ball screw axis.

9 is a schematic perspective view of the device of FIG.

FIG. 10 is a partially cutaway plan view of a linear motion guide device with a ball screw according to a fourth embodiment of the present invention.

FIG. 11 is a schematic cross-sectional view of the ball screw of FIG. 10 in a preloaded state.

FIG. 12 is a vertical cross-sectional view of a conventional linear motion guide device with a ball screw.

[Explanation of symbols]

 1 Linear motion guide device with ball screw 2 Guide rail 3 Sliding table 4 Ball screw shaft 4a, 4b, 4c, 4d Ball rolling groove 5a, 5b, 5c, 5d Ball rolling groove 5 Ball for ball screw 6 Linear guide Ball 8 Ball screw hole 11a Return passage 200,200 'Spacer 210,215 Preload adjusting bolt 211 Screw hole 220 Upper plate (connecting member) 221 Fixing bolt

Claims (8)

(57) [Claims] 1. A pair of rails provided in parallel with each other,
A slide table movably supported between the raceways, and a linear guide ball rotatably interposed between ball rolling grooves provided on the side surfaces of the raceway and the slide stand, A ball screw shaft screwed into a ball screw hole provided in the slide table, and a ball screw ball rotatably interposed between screw grooves provided on the inner circumference of the ball screw hole and the outer circumference of the ball screw shaft. In a linear motion guide device with a ball screw, the sliding base is divided into a first sliding base and a second sliding base in the axial direction, and each of the first and second sliding bases is divided into two parts. For the linear guide , a thread groove with the same pitch as the ball screw shaft is provided on the inner circumference of the ball screw hole, and a gap is provided between the first sliding base and the second sliding base.
When the ball rolling groove of the ball is discontinuous , an axial preload is applied to the ball screw ball by providing a phase difference between the screw grooves of the ball screw holes of the first and second slides. A linear motion guide device with a ball screw. 2. A pair of raceways provided in parallel with each other, a slide stand movably supported between the raceways, and a ball rolling groove provided on a side surface of the raceway and the slide stand. A linear guide ball rotatably mounted on the ball screw shaft, a ball screw shaft screwed into a ball screw hole provided in the slide base, and an inner circumference of the ball screw hole and an outer circumference of the ball screw shaft. In a linear motion guide device with a ball screw, comprising a ball screw ball rotatably interposed between screw grooves, the slide base is axially divided into a first slide base and a second slide base. In addition to a two-division structure, a screw groove having the same pitch as the ball screw shaft is provided on the inner circumference of the ball screw hole of each of the first and second sliding bases, and a gap is provided between the first sliding base and the second sliding base. Without close contact
In this state, a straight line with a ball screw is characterized in that an axial preload is applied to the ball for the ball screw by providing a phase difference between the screw grooves of the ball screw holes of each of the first and second slides. Exercise guidance device. 3. A gap between the facing surfaces of the first slide base and the second slide base.
First in the direction of pressing each other between the abutting surface when the between the no abutted, tighten the second slide base, said first, axial reaction force acting between the contact surface of the second sliding base 3. A phase difference is provided between the screw grooves of the ball screw holes of each of the first and second sliding bases to apply a preload in the axial direction to the balls for ball screws according to claim 2 . Linear motion guide device with ball screw. 4. The first slide base and the second slide base are displaced by a preload amount.
Let the screws of the ball screw holes of the first and second slides respectively
A preload is applied by providing a phase difference between the grooves.
The linear motion guide device with a ball screw according to 1 or 2. 5. A phase difference is provided between the thread grooves of the ball screw holes of the first and second sliding tables by interposing a spacer between the first sliding table and the second sliding table. The linear motion guide device with a ball screw according to claim 1 or 2, wherein the ball screw ball is provided with an axial preload. 6. A first slide base and a second slide base are axially displaced by a preload adjusting screw so that a phase difference is established between the screw grooves of the ball screw holes of the first and second slide bases. The linear motion guide device with a ball screw according to claim 1, wherein the ball screw ball is provided with an axial preload by being provided. 7. A phase difference between the thread grooves of the ball screw holes of the first and second sliding bases by applying a force in a direction in which the first sliding base and the second sliding base are axially displaced from each other. The first and second sliding bases are integrally fixed by a connecting member in a state in which a preload is applied to the ball screw ball by providing
Linear motion guide device with a ball screw according to. 8. A pair of rails provided in parallel with each other,
A slide table movably supported between the raceways, and a linear guide ball rotatably interposed between ball rolling grooves provided on the side surfaces of the raceway and the slide stand, A ball screw shaft screwed into a ball screw hole provided in the slide table, and a ball screw ball rotatably interposed between screw grooves provided on the inner circumference of the ball screw hole and the outer circumference of the ball screw shaft. In a linear motion guide device with a ball screw, the sliding base is divided into a first sliding base and a second sliding base in the axial direction, and the first and second sliding bases are linear. Before assembling on the rail via the guide ball, the opposing surfaces of the first and second slides are in contact with each other in advance in the direction of rotation about the ball screw shaft between the first and second slides. A predetermined angle difference is provided, and then, when both the first and second sliding bases are assembled to the raceway base, the angle difference in the rotation direction is set. First by the filtration,
The contact surfaces of the second slide base are pressed against each other, and the first slide base and the second slide base
Preload of a ball screw of a linear motion guide device with a ball screw, characterized in that an axial phase difference is generated between the screw grooves of the ball screw hole of the slide table to give an axial preload to the ball for the ball screw. Granting method.