JP3215738B2 - Linear guide device - 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 guide device for smoothly performing a linear motion of a mechanical structural member, which obtains a smooth and light motion in a linear direction and an operation with low noise.
The present invention relates to a linear guide device having sufficient rigidity in other directions.

[0002]

2. Description of the Related Art The types of linear bearings are broadly classified into rail type, round shaft type and flat type by forming rails, but the present invention is of the rail type capable of coping with complex loads. In particular, linear motion belongs to the category of infinite form. This type of conventional product is such that a ball or a roller is rolled in a corresponding track and a load track groove formed in a slider. In order to obtain an endless track, a rolling element such as a ball or a roller is temporarily loaded. The objective is achieved by returning to the original rolling element outlet through a return circuit provided in the slider.

According to this kind of structure, the diameter of the ball or roller as a rolling element is inevitably reduced due to the overall dimensional restrictions, and the rotation speed of the rolling element at a specific linear motion speed increases. Also, due to the structure of the return circuit, it is difficult to equip the retainer for rolling elements, which causes friction between the rolling elements, pressing action in the return circuit, and when the rolling elements separate from the load track or re-contact. Noise is generated, and a method of using a spacer ball between the load balls generates more noise. Of course, this noise not only increases in proportion to the linear motion speed, but also increases the wear of related parts.

[0004] In addition, there is a linear guide of a type in which a track roller is axially mounted on a slide carriage and this is rolled on a rail. However, since each track roller is individually supported by the carriage, it is added to the carriage. The load in the lateral direction is concentrated only on the track roller rolling on the load-side rail, and there is a disadvantage that only the wear of the members related thereto is particularly advanced.

[0005]

In order to eliminate such a drawback, a ball or a roller which rolls between the slider and the rail and circulates is abolished, and two pairs of front and rear rail wheels mounted on the slider are used. By directly engaging the linear motion guide portion of the rail machine and making the pair of orbiting wheels come into contact with each other, a highly accurate smooth operation and appropriate rigidity are obtained.

[0006]

In order to achieve the above object,
The linear guide device according to claim 1 of the present invention is a slide guide device.
A pair of races is installed on the left and right pair of races.
And a circle is formed on the cylindrical portion on the outer circumference of each of the above-mentioned track wheels.
An arc-shaped groove is formed, and the corresponding rail
A pair of left and right cylindrical rails are sandwiched between the right pair of raceways.
And each of the pair of left and right bearing rings is
Engage with a pair of cylindrical rails, the circle of the pair of left and right orbiting wheels
Linear guide device characterized by contacting the cylinders with each other
Place. The linear guide device according to claim 2 is a slider
A pair of bearing rings is installed in the
It is configured to be mounted on a shaft, and is vertically
And a corresponding pair of left and right rails
V-shaped groove is formed, and the left and right
The upper and lower inclined portions engage with the pair of left and right V-shaped grooves, and
It is characterized in that the cylindrical parts of a pair of left and right orbiting wheels are brought into contact with each other.
It is what it was. Also, a linear guide device according to claim 3 is provided.
The device is a linear gadget according to claim 1 or 2.
Two sets of upper and lower races were installed on the guide device.
It is characterized by.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention.
Is a slider composed of a main body 1 and an upper plate 2 for manufacturing, and two pairs of orbiting wheels are axially mounted on the same plane of the slider main body 1 in front and rear spaces. The two pairs of front and rear orbiting wheels 3, 3 'shown in FIGS. 1 and 2 have the same configuration as a well-known deep groove ball bearing, and each inner ring a is fixed to a slider A by supporting shafts 4, 4'. I have. The outer ring b has a plurality of balls 6 held between a slider body 1 and an upper plate 2 by a retainer 5.
, Which are rotatably supported, and have an arc-shaped groove (a) and a cylindrical portion (b) formed on the outer periphery thereof.

On the other hand, corresponding to the linear movement of the slider A, cylindrical rails 7, 7 'are provided on the inner side surfaces of both walls of a rail B having a U-shaped cross section. ′ Are respectively engaged with the arc-shaped grooves (a) formed on the outer ring b. The outer ring cylindrical portions (b) of the orbiting wheels 3 and 3 'are configured to be pressed and rolled at the center side of the slider A for each pair of front and rear orbiting wheels.

The two pairs of front and rear track wheels 8, 8 'shown in FIG.
Similar to the case of FIGS. 1 and 2 above, the slider body 1 is supported on the same surface, but the respective orbiting wheels 8 and 8 ′ are disk-shaped, and are provided with sliding bearings 9 and 9 ′. The slider 5 is pivotally mounted on the slider A by support shafts 5 and 5 '. On the outer circumference of the track wheels 8, 8 ', inclined portions c, c' are formed vertically, and V formations 10, 10 'are formed on the inner surfaces of both walls of the rail board B opposed to the slider A in the track direction. And the upper and lower inclined portions c and c 'of the respective orbiting wheels 8 and 8' are engaged therewith. Simultaneously, the cylindrical portion (b) at the center of the inclined portion of the orbiting wheels 8 and 8 'is pressed and rolled at the center side of the slider A for each pair of front and rear orbiting wheels, as shown in FIGS. Same as in the case. 11 is slider A
Is a ball screw displayed as one means for driving the linear motion in the linear motion direction.

Since the embodiment of the present invention is configured as described above, when the slider A moves upward in FIG. 1, for example, the right side of the two pairs of front and rear orbiting wheels 3, 3 'is used. The orbiting wheel 3 rotates clockwise, and the left orbiting wheel 3 'rotates counterclockwise, and engages the respective arc-shaped grooves (a) with the cylindrical rails 7 and 7' of the rail B. I do. At this time, the track wheels 3, 3 '
The lateral reaction force applied to the cylindrical rails 7 and 7 ′ is not only that the respective orbiting wheels 3 and 3 ′ are individually supported, but also that the left and right orbiting wheels 3 and 3 ′ are located at the center side of the slider A. Since the cylindrical portion (b) is in contact, the lateral pressure can be equally applied to both wheels, and the rotation of the two orbiting wheels 3, 3 'can be made uniform left and right and actively by the respective rolling effects. Done.

Along with such an operation, two pairs of orbiting wheels 3, 3 'are provided before and after the slider A.
There are four engagement portions between 3 'and the cylindrical rails 7, 7',
The rigidity of the slider A in the yawing direction can be sufficiently ensured. Further, the contact portions between the arc-shaped grooves (a) of the track wheels 3, 3 'and the cylindrical rails 7, 7' of the rail disc B can be set at two upper and lower positions depending on the shape of the grooves (a). It is possible to cope with the load on the slider A in the vertical direction and the load in the pitching and yawing directions.

Next, in the case of the orbiting wheels 8 and 8 'shown in FIG. 3, the fact that the outer peripheral cylindrical portion (b) is in contact with the center of the slider A means that the orbiting wheels 3 and 3' As in the case
Therefore, rigidity in the lateral direction and smooth operation can be obtained. The engagement of each of the orbiting wheels 8 and 8 'with the V-shaped grooves 10 and 10' of the rail disc B is such that the upper and lower inclined surfaces c and c 'of the outer periphery of the orbiting wheel are formed by the upper inclined surfaces of the V-shaped grooves 10 and 10', respectively. Since the slider A comes into contact with the lower inclined surface and responds to the load in the horizontal direction as well as the load in the horizontal direction, the slider A can withstand a complex load and perform a light operation. Accordingly, sufficient rigidity can be maintained even for loads applied to the slider A in the pitching, yawing, and rolling directions.

In the above-described slide of the V-shaped groove bearing system,
When the vertically inclined portions c, c of the track wheels 8, 8 'are formed in a slightly arc shape, the differential slip generated in the rolling portions of the track wheels is reduced, and a lighter sliding operation can be obtained. As in the case of the arc-shaped groove method, it can be adapted to linear drive of precision equipment.

[0014]

As described above, in the linear guide device of the present invention, the diameter of the rail and the rolling race wheel rolling is sufficiently large with respect to the width of the slider, and the rotation speed of the race wheel at a predetermined speed of the slider is achieved. However, since it is greatly reduced as compared with the conventional rolling pair, the generation rate of noise is low and the wear of the track wheels is also small. In particular, each orbital wheel is axially mounted on the same plane of the slider by a respective support shaft. In order to obtain an infinite linear motion, there is no circulating movement of the rolling element as in the conventional device. The generation of various noises and wear is minimal.

Since the pair of left and right orbiting wheels constituting the pair of races are in contact with the respective cylindrical portions on the center side of the slider, the driving performance for linear motion is good and the load can be evenly received. . Accordingly, in order to support the composite load with high rigidity, even when a preload (preload) is applied to the rail portion, each orbiting wheel can bear the force evenly.

In particular, the contact effect of the orbiting wheel cylindrical portion is such that when a rightward load is applied to the slider in FIGS. 2 and 3, for example, in FIG. 2 and FIG. Since not only the bearing wheel 3 or 8 supports but also the left bearing wheel 3 'or 8' which rolls with it, the load on the load side bearing ring is distributed by the support members of the left and right bearing wheels. I will do it. Accordingly, the wear of each orbiting wheel support portion is relatively reduced, and the characteristic linear sliding effect can be maintained for a long period of time, and the shaft support member of the orbiting wheel can be made compact if the load is equivalent.

Further, the arrangement of the orbiting wheels as described above is vertically shifted by two.
If a total of four sets are provided, it is possible to construct a slide device that is more resistant to combined loads and moment loads, and a railroad plate with a U-shaped cross section provides an appropriate preload to the rail wheels by the elastic effect. It is also possible.

As described above, since the overall load balance is good and there are few causes of errors, high-precision linear motion can be obtained, and there is little noise even at high speed driving. It is highly useful with conditions.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of the present invention, in which a part of an upper plate of a slider is cut away.

FIG. 2 is a cross-sectional view taken along the line SS shown in FIG.

FIG. 3 is a cross-sectional view of another embodiment of the present invention, corresponding to FIG.

[Explanation of symbols]

 Reference Signs List A slider B rail board 3 3 'rail wheel motion 4 4' support shaft 7 7 'cylindrical rail 8 8' other shape rail wheel 10 10 'V-shaped groove

Claims (3)

(57) [Claims] A pair of bearing rings installed on a slider,
Pair is configured by pivotally attached a pair of right and left軌動wheels, to form an arc-shaped groove in the cylindrical portion of the outer periphery of each軌動wheels, sandwich the pair of right and left bearing ring in rail board corresponding thereto Left and right
A pair of cylindrical rails is provided, and the pair of right and left
Each of the road wheels engages the pair of left and right cylindrical rails,
A linear guide device wherein the cylindrical portions of a pair of left and right orbital wheels are brought into contact with each other. 2. A bearing ring pair is provided on a slider.
The pair consists of a pair of left and right orbiting wheels, and each of the above
The upper and lower inclined parts are formed in the cylindrical part on the outer periphery of the ring to respond to this
A pair of left and right V-shaped grooves are formed on the rail
The upper and lower inclined portions of the pair of left and right races are
Of the pair of left and right orbiting wheels, and
Linear guide device characterized by being brought into contact with 3. The method according to claim 1, wherein
In linear guide devices, Linear, characterized by two pairs of bearing rings installed up and down
Guide device.