JP4300851B2 - Linear motion guide bearing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a linear motion guide bearing device used, for example, in the industrial machine field.
[0002]
[Prior art]
As a conventional linear motion guide bearing device of this type, for example, as shown in FIG. 5, a guide rail 1 extending in the axial direction, and a slider 2 straddled on the guide rail 1 so as to be relatively movable in the axial direction, The one with is known.
On both side surfaces of the guide rail 1, rolling element rolling grooves 3 extending in the axial direction are formed in two rows on one side, and a total of four rows. The slider body 2 </ b> A of the slider 2 has both sleeve portions 4. On the inner side surface, rolling element rolling grooves 31 that face the rolling element rolling grooves 3 are formed.
[0003]
A large number of balls B as rolling elements are slidably loaded between the rolling grooves 3 and 31 facing each other, and the slider 2 is guided to the guide rail 1 through the rolling of the balls B. It can move relative to the top along the axial direction.
Along with this movement, the ball B interposed between the guide rail 1 and the slider 2 rolls and moves to the end of the slider 2, but in order to continuously move the slider 2 in the axial direction, It is necessary to circulate these balls B indefinitely.
[0004]
Therefore, two upper and lower rolling element passages 8 (four in total) penetrating in the axial direction are formed in the sleeve portion 4 of the slider main body 2A, and end caps 5 are respectively attached to the front and rear ends of the slider main body 2A. 12 is fixed, and the end cap 5 is formed with a direction change path 6 curved in a semicircular arc shape that communicates between the rolling element rolling grooves 3 and 31 and the rolling element path 8. It constitutes a rolling element infinite circulation trajectory. In the figure, reference numeral 10 denotes a tapped hole for screwing and fixing the end cap 5 to the end surface of the slider body 2A, 11 denotes a side seal, and 13 denotes a greasing nipple provided on the side surface or end surface of the end cap.
[0005]
By the way, when the end cap 5 is fixed to the end face of the slider body 2A, the alignment between the rolling element rolling grooves 3 and 31 and the rolling element path 8 and the direction changing path 6 on the end cap 5 side is determined by the ball B. Therefore, conventionally, as shown in FIGS. 6 and 7, the rolling element rolling between the upper and lower rolling element rolling grooves 31 of the slider body 2 </ b> A is important. The positioning groove 32 parallel to the moving groove 31 is ground along the axial direction simultaneously with the rolling element rolling groove 31, and the end cap 5 has a projection 33 that engages with the positioning groove 32 as shown in FIG. 8. The end cap 5 is positioned by fitting the protrusion 33 into the positioning groove 32 (see, for example, Patent Document 1).
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-139035
[Problems to be solved by the invention]
In the conventional linear motion guide bearing device, when the slider 2 is inserted into the guide rail 1 and the slider main body 2A is deformed by opening and heat treatment, generally, the slider main body 2A having a U-shaped cross section is The sleeve 4 is deformed so that the center of the upper surface is the center of rotation and the sleeve 4 is opened outward in the width direction, and this deformation becomes larger toward the lower end of the sleeve 4.
[0008]
Accordingly, as described above, when the positioning groove 32 is provided between the two upper and lower rolling element rolling grooves 31 of the slider body 2A and this is used as the positioning reference of the end cap 5, the lower end side of the positioning reference of the end cap 5 is set. The deformation of the portion no longer follows the deformation of the slider body 2A, and the positioning accuracy of the rolling element rolling groove 31 and the direction change path 6 on the lower side of the slider body 2A having a large deformation rate deteriorates, and the ball B is circulated. There is a risk of adverse effects.
[0009]
The present invention has been made in order to eliminate such inconvenience, and by increasing the positioning accuracy of the upper and lower rolling element rolling grooves on the slider body side and the direction changing path on the end cap side, the rolling element can be made smooth. An object of the present invention is to provide a linear motion guide bearing device capable of ensuring a good circulation and improving operability.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is directed to a guide rail having axially extending rolling element rolling grooves extending on both sides, and the rolling element rolling of the guide rail. There is a rolling element rolling groove facing the rolling groove, and it straddles the guide rail so as to be relatively movable along the axial direction through rolling of the rolling element inserted between both rolling element rolling grooves. A slider body provided with a rolling element passage groove and a rolling element passage penetrating in the axial direction, and communicating between the rolling element passage groove and the rolling element passage. And a pair of end caps fixed to both end faces in the axial direction of the slider main body, and the rolling elements rolling grooves are arranged in a total of 4 on one side of the upper and lower two rows. The rolling element passages were arranged in a row and the number of rolling element passages was four in total. A motion guide bearing device,
A concave portion is provided on the inner surface of the lower end portion of the sleeve portion of the slider body, and a projection is provided on the end cap to engage with the concave portion to position the end cap. It is formed so as to open in the width direction based on the deformation of the part .
[0011]
The invention according to claim 2 is characterized in that, in claim 1, the recess is ground in the axial direction simultaneously with the rolling element rolling groove of the slider body.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings. 1 is a partially cutaway view for explaining a linear guide bearing device as an example of an embodiment of the present invention, FIG. 2 is an exploded perspective view of a slider body and an end cap, and FIG. 3 is a slider body. 4 is a perspective view for explaining the deformation of the end cap, and FIG. 4 is an explanatory view for explaining the deformation of the slider body.
[0013]
As shown in FIG. 1, a linear motion guide bearing device 50, which is an example of an embodiment of the present invention, is stretched over a guide rail 51 extending in the axial direction so as to be relatively movable in the axial direction on the guide rail 51. And a slider 52.
On both side surfaces of the guide rail 51 in the width direction, rolling element rolling grooves 53 extending in the axial direction are formed in four rows, one on each side, and a total of four rows are formed. A rolling element rolling groove 55 that faces the rolling element rolling groove 53 is formed on the inner surface of the portion 54.
[0014]
A large number of rollers 56 as rolling elements are slidably loaded between the rolling elements rolling grooves 53 and 55, and the slider 52 is axially moved on the guide rail 51 through the rolling of these rollers 56. It is designed to move relative to each other. With this movement, the roller 56 interposed between the guide rail 51 and the slider 52 rolls and moves to the end of the slider 52 in the axial direction. In order to continue moving the slider 52 in the axial direction, It is necessary to circulate these rollers 56 indefinitely.
[0015]
For this reason, two upper and lower (total four) holes 57 are formed in the sleeve portions 54 on both sides of the slider body 52A in the axial direction, and the passages of the rollers 56 are formed in the holes 57 (rolling element passages). A circulation tube 58 formed as 58a is fitted, and a pair of end caps 59 serving as rolling element circulation parts are fixed to both ends of the slider body 52A in the axial direction via screws or the like, and the above-mentioned two rotations are fixed to the end cap 59. By forming a direction changing path (not shown) curved in a semicircular arc shape that communicates between the rolling element rolling grooves 53 and 55 and the rolling element passage 58a, an endless circulation track of the roller 56 is formed.
[0016]
Since the direction change path provided in the end cap 59 uses the roller 56 as a rolling element in this embodiment, the upper rolling element passage 58a and the lower rolling element rolling grooves 53, 55 are between. Are connected to each other, and the lower rolling element passage 58a and the upper rolling element rolling grooves 53, 55 are connected to each other.
Here, in this embodiment, as shown in FIGS. 1 and 2, grinding is performed in the axial direction simultaneously with the rolling element rolling groove 55 below the rolling element rolling groove 55 on the lower side of the slider body 52A. A V-shaped positioning groove (concave portion) 60 is provided in parallel with the rolling element rolling groove 55, and a V-shaped protrusion 61 that engages with the positioning groove 60 is provided on the end cap 59, and the protrusion 61 is The end cap 59 is positioned by being fitted into the positioning groove 60, thereby aligning the rolling element rolling grooves 53, 55 and the rolling element passage 58 a with the direction changing path on the end cap 59 side. ing.
[0017]
Thus, in this embodiment, since the positioning groove 60 for engaging the protrusion 61 of the end cap 59 is provided below the rolling element rolling groove 55 on the lower side of the slider main body 52A, the slider 52 is guided by the guide rail 51. As shown in FIGS. 3 and 4, the slider main body 52A having a U-shaped cross section has the center of the upper surface as the center of rotation and the sleeve portion 54 has a width as shown in FIGS. Even if it is deformed to open outward in the direction, the end cap 59 is deformed following the deformation of the lower end side of the sleeve portion 54 of the slider body 52A. In this case, the end cap 59 is formed so that the portion corresponding to the sleeve portion 54 of the end cap 59 is opened slightly outward in the width direction in consideration of the deformation of the sleeve portion 54 of the slider body 52A.
[0018]
As a result, the positioning accuracy of the upper and lower rolling element rolling grooves 55 on the slider main body 52A side and the direction changing path on the end cap 59 side can be improved, and smooth circulation of the rollers 56 is ensured to improve operability. Can be planned.
The linear guide bearing device of the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist of the present invention.
[0019]
For example, in the above-described embodiment, the linear motion guide bearing device employing the roller 56 as the rolling element is taken as an example. Instead, the present invention is applied to a linear motion guide bearing device employing a ball as the rolling element. May be.
Moreover, in the said embodiment, although the case where the positioning groove | channel 60 and the processus | protrusion 61 were made into the V shape was taken as an example, these shapes are not specifically limited and can be changed suitably.
[0020]
【The invention's effect】
As is clear from the above description, according to the present invention, since the positioning accuracy between the upper and lower rolling element rolling grooves on the slider body side and the direction changing path on the end cap side can be increased, the rolling element can be smoothly smoothed. The effect of ensuring the circulation and improving the operability is obtained.
[Brief description of the drawings]
FIG. 1 is a partially cutaway view for explaining a linear guide bearing device as an example of an embodiment of the present invention.
FIG. 2 is an exploded perspective view of a slider body and an end cap.
FIG. 3 is a perspective view for explaining deformation of a slider main body and an end cap.
FIG. 4 is an explanatory diagram for explaining a deformation of the slider body.
FIG. 5 is a partially broken perspective view for explaining an example of a conventional linear motion guide bearing device.
FIG. 6 is an explanatory diagram for explaining a position where a conventional positioning groove is formed on a slider body.
7 is a cross-sectional view taken along line AA in FIG.
FIG. 8 is a view showing an end cap provided with a protrusion that engages with a conventional positioning groove;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 50 ... Linear motion guide bearing apparatus 51 ... Guide rail 52 ... Slider 52A ... Slider main body 53 ... Rolling body rolling groove (guide rail side)
55 ... rolling element rolling groove (slider side)
56 ... Rollers (rolling elements)
58a ... rolling element passage 59 ... end cap 60 ... positioning groove (concave)
61 ... Protrusions

Claims (2)

A guide rail extending in the axial direction with rolling element rolling grooves extending in the axial direction on both sides, and a rolling element rolling groove facing the rolling element rolling groove of the guide rail, and And a slider straddling the guide rail so as to be relatively movable along the axial direction via rolling of the rolling elements inserted between the rolling elements rolling grooves, the slider rolling the rolling elements A slider body provided with a groove and a rolling element passage penetrating in the axial direction; and a shaft of the slider body having a curved direction changing path communicating between the rolling element rolling grooves and the rolling element passage. A pair of end caps fixed to both end faces in the direction, and further, the rolling element rolling grooves are arranged in four rows in one upper and lower two rows, and the rolling element passages are in two upper and lower sides on one side. A total of four linear motion guide bearing devices,
A concave portion is provided on the inner surface of the lower end portion of the sleeve portion of the slider body, and a projection is provided on the end cap to engage with the concave portion to position the end cap. A linear guide bearing device formed to open in the width direction based on the deformation of the portion .   2. The linear guide bearing device according to claim 1, wherein the concave portion is ground in the axial direction simultaneously with the rolling element rolling groove of the slider body.

Images