JP3064452U - Linear guide device - Google Patents

Abstract

(57) [Problem] To provide a high-precision linear guide device having a long service life. A roller 62 is disposed above a guide rail 40 to extend the service life of the device. A roller sleeve 514 is provided in the roller guide, and first and second ball rolling grooves are formed so as to intersect a circular curved surface. Thus, a high-precision linear guide device was formed.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a linear guide device that uses a ball as a rolling element interposed between a guide rail and a slider that runs on the guide rail.

[0002]

[Prior art]

 Conventional linear guide devices of this type include, for example, those shown in FIGS. Since each of these devices is symmetrical, only the right half will be described. In the first example, as shown in FIGS. 4 and 5, a linear guide device 10 is provided in which a slider 12 is mounted on a guide rail 11 and a number of balls are interposed between the two as rolling elements. . The balls 13 and 14 have first rolling grooves 111 and 112 provided on the upper surface and side surfaces of the guide rail 11, respectively, and second rolling grooves 121 and 122 provided on the inner surface of the slider 12 to face the first rolling grooves 111 and 112, respectively. While rolling along with the movement of the slider 12, it circulates infinitely through circulation paths 123 and 124 as ball guides.

In a second example, as shown in FIGS. 6 and 7, a slider 22 is mounted on a guide rail 21 and a number of rollers 24 and 25 are interposed between the two as rolling elements. The linear guide device 20 is shown. Rollers 24 and 25 are provided on roller rolling slopes 212 and 213, which extend obliquely up and down 45 degrees from the groove bottom of concave groove 211 provided on the side surface of guide rail 21, and are provided on the inner surface of slider 22 facing these. The rolling slopes 214 and 215 crossed and rolled in accordance with the movement of the slider 22, and endlessly circulate through circulation paths 217 and 216 as roller guides.

Further, in a third example, as shown in FIGS. 8 and 9, a slider 32 is mounted on a guide rail 31 and a number of balls 34 and 35 are interposed between the two as rolling elements. Linear guide device 30. The balls 34 and 35 are provided with ball rolling grooves 332 provided on the inner surface of the slider 32 in opposition to ball rolling grooves 331 and 333 provided on both edges of the concave groove 311 provided on the side surface of the guide rail 31. While moving in 334 with the movement of the slider 32, the ball circulates infinitely through circulation paths 335 and 336 as ball guides.

[0005]

[Problems to be solved by the invention]

 Each of the above-mentioned conventional devices can perform infinite circulation, but has the following problems.

(1) The service life is short The first example of the conventional device uses a ball as a rolling element, but the load life of the ball itself is short (depending on the load, the rating is generally about 50 km). ), The service life when used in a linear guide device is also shortened. The same applies to the third example using the above-mentioned conventional ball.

(2) The relative position accuracy of the rolling path is poor In the second example of using the rollers of the conventional device, the life is slightly longer than in the first example, but most of the load from the slider 22 is reduced by the rolling slope 213. , 215 are received by the rollers 25, which tend to shift downward along the rolling slopes, resulting in inferior movement accuracy of the device. The third example of the conventional device has a similar tendency.

[0008] In view of the problems of the above-described conventional device, an object of the present invention is to provide a linear guide device that uses rollers and balls with high accuracy and a long service life.

[0009]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a horizontally long guide rail having a substantially horizontal upper surface, and both side surfaces along the vertical direction substantially orthogonal to both sides of the upper surface, and the movable guide rail. A slider having both arms facing both sides of the guide rail, and a ball rolling groove extending in the axial direction on the side surface of the guide rail, and a slider at the sleeve of the slider. Correspondingly, a ball rolling groove is formed, and the ball is rollably interposed in the rolling track formed by the two ball rolling grooves, and is opposed to the upper surface of the guide rail of the slider. Roller rolling grooves are formed symmetrically in parallel on the lower surface to be formed, and rollers that can roll are interposed in the rolling track formed by the upper surface and the roller rolling grooves, In the slider, a circulation path is formed in a parallel manner above each roller rolling groove. Roller guides and ball guides that form ball circulation paths are provided in parallel to the side portions of each of the ball rolling grooves, and the roller rolling grooves are provided inside both front and rear end surfaces of the slider. The linear guide device is configured such that the corresponding roller guides and the end caps on which the ball rolling grooves and the corresponding ball guides are formed so as to communicate with the corresponding ball guides are in close contact with each other.

As described above, since the roller raceway surface is formed on the upper surface of the guide rail, most of the load received from above by the slider can be received by the roller having a large thrust load, so that the groove is not easily deformed. , Accuracy can be increased. In addition, the use life of the device itself can be extended by using the rollers.

[0011] Preferably, a rectangular cross-section sleeve that fits the rollers is provided inside the roller guide.

Further, it is preferable that the first and second ball rolling grooves are formed in a so-called Gothic shape in which the groove surface has an intersecting curved surface.

According to such a configuration, the number of contact points between the ball and the first and second ball rolling grooves is four, so that the rolling wear of the ball can be reduced and the load can be increased. Therefore, the service life of the device itself is prolonged, and the accuracy of the device can be maintained.

[0014]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be specifically described, but the present invention is not limited to these examples.

FIGS. 1 to 3 show one embodiment of the present invention. On the substantially prismatic guide rail 40, the sliders 54, 54, which face both sides of the guide rail 40 from both sides thereof, extend downward, and the slider 50 having a substantially U-shaped cross section is axially opposed. It is movably mounted. The slider 50 includes a slider body 51 and end caps 52, 52 detachably attached to both ends in the axial direction thereof.

The flat upper surface 41 of the guide rail 40 forms parallel two-roller raceway surfaces 411, 411 occupying substantially the entire width of the rail at intervals along the axial direction. In addition, first ball rolling grooves 421, 421 having curved surfaces intersecting with each other, extend in the axial direction on both left and right side surfaces 42, 42 of the guide rail 40.

On the other hand, as shown in FIG. 3, in the slider body 51, roller rolling grooves 513 having a rectangular cross section facing the roller raceway surfaces 411, 411 of the guide rail 40 are provided on the inner surface of the body above the guide rail 40. The second ball rolling grooves 511, 511, which are formed and have a substantially cross-sectionally arcuate cross section facing the first ball rolling grooves 421, 421 of the guide rail 40, It is formed on the inside surface. Note that the ball 61 rolls so as to come into contact with four places in the first and second ball rolling grooves 421 and 511 forming a cross circular curved surface.

Further, guides 515, 515 forming a circular roller circulation path in the axial direction parallel to the roller rolling grooves 513, 513 are provided on the upper portion 55 of the slider 51 main body. Incidentally, rectangular sleeves 514, 514 along the shape of the rollers are fitted in the roller guides 515, 515.

Further, a through hole having an inner diameter slightly larger than the diameter of the ball 61 of the rolling element 60 is formed in each sleeve portion 54 of the slider body 51 as a ball guide 512 in parallel with the second ball rolling groove 511. Is provided. The end caps 52, 52 are fitted with dustproof plates 53, 53 on their outer surfaces, respectively, and are joined to both end surfaces of the slider body 51. Roller rolling grooves 513, 513 formed in the slider main body 51 and roller guides 515, 515 parallel to the roller rolling grooves 513, 513 formed in the slider main body 51 are communicated with the end faces of the end caps 52, 52 which are joined to the slider main body 51. The first reflectors 521,. . . (Not shown) are formed. This first reflector 521,. . . Are located at the center of the lateral semi-disc-shaped recess provided on the joint end surface, and have semi-cylindrical return guides 522,. . . It is formed by fitting (not shown). A second reflector 523 for connecting the second ball rolling groove 511 and a ball guide 512 of a through hole parallel to the second ball rolling groove 511 to a joint end face of the end cap 52 with the sled portion 54 of the slider body 51. ,. . . (Not shown) are formed. This second reflector 523,. . . The semi-cylindrical return guides 524,. . . (Not shown). By attaching the end caps 52, 52 to both end surfaces of the slider body 51, a roller endless circulation path and a second ball constituted by a roller rolling groove 513, a roller guide 515, and a first reflector 521 are provided. An infinite ball circulation path composed of the rolling grooves, the ball guide 512, and the second reflector 523 is formed.

[0020]

[Effect of the invention]

 In the present invention configured as described above, the guide rail upper surface receives most of the load through rollers having high rigidity and a high rated life, and a ball with good alignment is provided on the side of the guide rail and the slider or the like. In addition to securing the advantages of the conventional device by eliminating the disadvantages of the conventional device by improving the localization reliability by intervening in the part, the installation of the sleeve and the formation of a ball rolling groove that forms an intersecting curved surface enable the rolling to be performed. The life of the rollers and balls as a moving body is reduced, the service life is further extended, and the relative position between the rolling groove and the guide is maintained, so that high precision can be achieved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a part of a configuration of an embodiment of the present invention in a disassembled state and showing a part of a slider in cross section.

FIG. 2 is a perspective view showing a combined state of FIG. 1;

FIG. 3 is an enlarged front view of the front view of FIG. 2 and a ball rolling groove in which an end cap is omitted.

FIG. 4 is a perspective view showing a configuration of a conventional linear guide device in which a part of a slider is shown in cross section.

FIG. 5 is a front view of the apparatus of FIG. 4;

FIG. 6 is a perspective view showing a configuration of a second conventional linear guide device in which a part of a slider is shown in cross section.

FIG. 7 is a front view of the apparatus of FIG. 6;

FIG. 8 is a perspective view of a configuration of a third conventional linear guide device, showing a part of a slider in cross section.

9 is a front view of the device of FIG.

[Explanation of symbols]

 40 Guide rail 41 Upper surface of rail 411 Roller raceway surface 421 First ball rolling groove 50 Slider 51 Slider body 55 Upper part of main body 54 Sleeve of main body 513 Roller rolling groove 514 Sleeve 515 Roller guide 511 Second ball rolling Moving groove 512 Ball guide 60 Rolling element 61 Ball 62 Roller 52 End cover 53 Dustproof plate 521 First reflector 523 Second reflector

Claims (3)

[Utility model registration claims] 1. A horizontally long guide rail having a substantially horizontal upper surface, and both side surfaces along a vertical direction substantially orthogonal to both sides of the upper surface, and movably mounted on the guide rail,
A slider having both sides facing the both sides of the guide rail; and a ball rolling groove extending in the axial direction on the side of the guide rail, and a slider corresponding to the sleeve of the slider. A ball rolling groove is formed, the ball is rotatably interposed in the rolling track formed by the two ball rolling grooves, and the lower surface of the slider facing the upper surface of the guide rail has left-right symmetry. A roller rolling groove is formed in parallel with the shape of the roller, and rolling rollers are interposed in a rolling track formed by the upper surface portion and the roller rolling groove. A roller guide that becomes a circulation path parallel to the upper part of the rolling groove, and a ball guide that becomes a ball circulation path parallel to the side part of each of the ball rolling grooves, respectively, and
On each of the front and rear end surfaces of the slider, the above-mentioned roller rolling grooves and the corresponding roller guides, and curved reflectors for communicating the respective ball rolling grooves and the corresponding ball guides are formed therein. A linear guide device, wherein an end cap is closely adhered and joined. 2. The linear guide device according to claim 1, wherein a rectangular cross-section sleeve that fits the rollers is provided inside the roller guide. 3. The linear guide device according to claim 1, wherein each of the first and second ball rolling grooves has a cross-sectional curved surface.