JP2006170418A - Linear movement guide bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a linear movement guide bearing device capable of properly positioning a sealing device and a slider and obtaining expected lubricant supply capability and dust prevention property sufficiently. <P>SOLUTION: This linear movement guide bearing device is provided with a guide rail 1 having a rolling body rolling face 3 extending in the axial direction, the slider 2 having a rolling body rolling face 5 opposing to the rolling body rolling face 3 of the guide rail 1 and stretched across the guide rail 1 to move relatively along the axial direction through rolling of many rolling bodies 6 inserted between both of these rolling body rolling faces 3 and 5, and the sealing device provided in an end part in the axial direction of the slider 2. The sealing device is provided with a sealing member 20 for sealing an end part in the axial direction of the slider 2 due to slide-contact with the guide rail 1 and a casing member 30 for storing at least one sealing member 20. Uneven fitting parts 31, 32 for positioning the sealing device and the slider 2 are provided. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a linear motion guide bearing device used in, for example, a machine tool, a conveying device, and the like.

As a conventional linear guide bearing device of this type, for example, the one shown in FIGS. 10 and 11 is known.
This linear motion guide bearing device includes a guide rail 1 extending in the axial direction, and a slider 2 having a substantially U-shaped cross section straddling the guide rail 1 so as to be relatively movable in the axial direction. A rolling element rolling surface 3 extending in the axial direction is formed on each side surface portion 1 in the width direction 1 in a total of four rows, one on each side. The slider body 2A of the slider 2 is formed with rolling element rolling surfaces 5 on the inner side surfaces of both sleeve portions 4 respectively facing the rolling element rolling surfaces 3 in two rows on one side.

A large number of rollers 6 as rolling elements are slidably loaded between the rolling surfaces 3 and 5 of the rolling elements, and the slider 2 moves on the guide rail 1 in the axial direction through the rolling of these rollers 6. It is designed to move relative to each other.
With this movement, the roller 6 interposed between the guide rail 1 and the slider 2 rolls and moves to the end of the slider 2 in the axial direction, but in order to continue moving the slider 2 in the axial direction, It is necessary to circulate these rollers 6 indefinitely.

  For this reason, holes 7 penetrating in the axial direction in both sleeve portions 4 of the slider body 2A are formed in two places, one on the upper and lower sides, for a total of four, and the inside of the hole 7 is a passage (rolling member passage) 8a for the roller 6. A pair of end caps 9 as rolling element circulation parts are fixed to both ends of the slider body 2A in the axial direction via screws 10 or the like, and both the rolling elements are attached to the end cap 9. An infinite circulation track of the roller 6 is formed by forming a direction changing path (not shown) curved in a substantially arc shape that communicates between the rolling surfaces 3 and 5 and the rolling element passage 8a.

And in this example, the direction change path which connects between the upper rolling element channel | path 8a and the lower rolling element rolling surfaces 3 and 5, the lower rolling element channel | path 8a, and both upper rolling element rolling elements The direction change path which connects between the surfaces 3 and 5 is formed. In FIG. 10, reference numeral 11 denotes a side seal fixed to the end surface of the slider body 2 </ b> A together with the end cap 9 via a screw 10 or the like.
The side seal 11 is substantially U-shaped like the end cap 9 and has an inner peripheral portion that is a sealing surface that is in sliding contact with the guide rail 1 and is formed by baking and adhering rubber to a steel plate or the like.

  By the way, in a linear motion guide bearing device used for a machine device such as a machine tool in which foreign matter such as cutting powder is generated in the periphery, not only the seal by the side seal 11 described above is sufficient, but also the lubrication conditions become severe. Conventionally, a lubricant supply member that supplies a lubricant while slidingly contacting the guide rail 1 between the side seal 11 and the end cap 9 for preventing small foreign substances from entering the slider 2 is used as the casing member. The thing which interposed the sealing apparatus accommodated is proposed (for example, refer patent documents 1-8).

Japanese Patent No. 3288961 JP 2002-147453 A JP 2000-110833 A JP-A-11-303866 JP 2001-187919 A JP 2000-144771 A JP 2000-145769 A Japanese Patent Laid-Open No. 11-93952

However, in Patent Documents 1 to 8, in any of the sealing devices, the attachment to the slider 2 side is generally performed using 2 to 4 screws 10. Since the screw 10 is screwed and fixed to the slider 2 through the large-diameter screw insertion hole, the casing member is rattled by the dimensional difference between the diameter of the screw 10 and the diameter of the screw insertion hole and stored in the casing member. In some cases, the lubricant-containing member and the guide rail 1 cannot be adequately contacted. In such a case, the assumed lubricant supply capacity and dustproof performance cannot be obtained sufficiently, and the linear motion guide bearing device There is a risk of shortening the service life.
The present invention has been made in order to eliminate such inconveniences, and is a linear motion guide capable of adequately positioning the sealing device and the slider and sufficiently obtaining the assumed lubricant supply capability and dust resistance. An object is to provide a bearing device.

In order to achieve the above object, the invention according to claim 1 includes a guide rail having a rolling element rolling surface extending in the axial direction, and a rolling element rolling surface facing the rolling element rolling surface of the guide rail. A slider straddling the guide rail so as to be relatively movable along the axial direction through rolling of a large number of rolling elements inserted between the rolling surfaces of both the rolling elements, and a shaft of the slider A seal device provided at an end portion in the direction, and the seal device accommodates at least one seal member, and a seal member that slides on the guide rail and seals the end portion in the axial direction of the slider. In a linear guide bearing device comprising a casing member,
A positioning uneven fitting portion for positioning the sealing device and the slider is provided.

According to a second aspect of the present invention, in the first aspect, a plurality of the sealing devices in which the single sealing member is accommodated in the single casing member are attached to the end portion in the axial direction of the slider, and the plurality of the sealing members are attached. An uneven fitting portion for positioning for positioning the devices relative to each other is provided.
The invention according to claim 3 is characterized in that, in claim 1 or 2, the seal member is impregnated with a lubricant so that the lubricant can be supplied to the guide rail.

According to the present invention, since the positioning concave / convex fitting portion for positioning the sealing device and the slider is provided, the sealing device is properly positioned with respect to the slider and the guide rail. Proper contact with the guide rail can prevent foreign objects from entering.
In this case, the lubricant can be supplied to the guide rail by impregnating the seal member with the lubricant, so that the lubricant supply capability can be sufficiently exerted. As a result, the assumed lubricant supply capability and Dust resistance can be sufficiently obtained, and the life of the linear motion guide bearing device can be extended.

In addition, by attaching a plurality of sealing devices containing one sealing member in one casing member to the end portion in the axial direction of the slider, and providing positioning uneven fitting portions for positioning the plurality of sealing devices relative to each other, The amount of the seal device attached to the slider can be finely set according to the required amount of lubricant.
Accordingly, it is possible to shorten the axial dimension of the slider as compared with the case where a plurality of seal members are housed in one casing member, and it is possible to minimize the stroke that is sacrificed by mounting the seal device. .

  Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings. 1 is a view showing a casing member in a seal device of a linear motion guide bearing device as an example of an embodiment of the present invention, FIG. 2 is a view showing an example of a seal member housed in the casing member of FIG. 4 is a view showing an example of an end cap, FIG. 4 is a view showing an example of a side seal, FIG. 5 is a view showing an example of a positioning convex portion, and FIGS. 6 to 9 are views showing modifications of the positioning convex portion. is there. In this embodiment, only differences from the conventional linear motion guide bearing device already described with reference to FIGS. 10 and 11 will be described, and the reference numerals in FIGS. 10 and 11 will be used for necessary portions.

  In a linear motion guide bearing device that is an example of an embodiment of the present invention, a seal device (not shown) is interposed between an end cap 9 and a side seal 11 of the slider 2, and the seal device is A seal member 20 (see FIG. 2) that slides in contact with the guide rail 1 to seal the end of the slider 2 in the axial direction, and a casing member 30 (see FIG. 1) that houses at least one of the seal members 20 are provided. . The sealing device may be arranged only on one end, not on both ends of the slider 2.

The seal member 20 is formed of, for example, a synthetic resin containing a lubricant such as lubricating oil or grease. As shown in FIG. 2, the seal member 20 is substantially U-shaped corresponding to the cross-sectional shape of the guide rail 1 as with the end cap 9. A part or the entire circumference of the U-shaped inner periphery is in sliding contact with the guide rail 1 to supply the lubricant.
As shown in FIG. 1, the casing member 30 is substantially U-shaped and has a space portion 30 a that accommodates the seal member 20. An interval is provided so as not to contact the guide rail 1.

Here, in this embodiment, as shown in FIG. 3, a positioning convex portion 31 is provided on the surface of the end cap 9 on the side away from the end surface of the slider main body 2A, and as shown in FIG. A positioning concave portion 32 into which the positioning convex portion 31 is fitted is provided on the surface facing the end cap 9.
Further, a positioning convex portion 33 having the same shape as the positioning convex portion 31 of the end cap 9 is provided on the rear surface (the surface on the side away from the end cap 9) of the casing member 30 on which the positioning concave portion 32 is provided. Yes.

Further, as shown in FIG. 4, the side seal 11 is provided with a positioning concave portion 34 into which the positioning convex portion 31 of the end cap 9 or the positioning convex portion 33 of the casing member 30 is fitted.
When the sealing device is mounted between the end cap 9 of the slider 2 and the side seal 11, the positioning concave portion 32 of the casing member 30 of the sealing device is fitted to the positioning convex portion 31 of the end cap 9. Then, the positioning concave portion 34 of the side seal 11 is fitted into the positioning convex portion 33 of the casing member 30, whereby the slider 2 and the sealing device are positioned. When the sealing device is not attached, the positioning concave portion 34 of the side seal 11 is fitted into the positioning convex portion 31 of the end cap 9.

  In addition, when a plurality of sealing devices in which one sealing member 20 is accommodated in one casing member 30 are attached between the end cap 9 and the side seal 11 of the slider 2, a positioning projection 31 of the end cap 9 is provided. The positioning concave portion 32 of the casing member 30 located closest to the end cap 9 is fitted into the positioning convex portion 33 of the casing member 30 located closest to the side seal 11 and the positioning concave portion 34 of the side seal 11 is provided. With respect to the sealing device that is fitted and positioned at the intermediate portion, the positioning concave portion 32 of the casing member 30 is fitted to the positioning convex portion 33 of the casing member 30.

The positioning projections 31 and 33 provided on the end cap 9 and the casing member 30 have a cylindrical shape (see FIG. 5) as shown in FIGS. In addition to a columnar shape (see FIG. 6), a prismatic shape (see FIG. 7), a prismatic shape with a phase shifted by 90 ° (see FIG. 8), and a pyramid shape (see FIG. 9), various shapes such as a cylindrical shape and a semicylindrical shape A shape can be adopted.
In general, since the end cap 9 and the casing member 30 of the sealing device are made of a resin molded product, any shape can be formed. Therefore, the shape of the positioning convex portions 31 and 33 does not need to be particularly limited. In this shape, it is sufficient that the positioning is performed by fitting with the positioning recesses 32 and 34.

Similarly, there is no particular limitation on the shape of the positioning recesses 32 and 34 as long as positioning is performed, and the combination of the positioning projections 31 and 33 and the positioning recesses 32 and 34 can be freely selected. It is. As for the material of the casing member 30, resin is given as an example, but the material is not limited to resin.
Thus, in this embodiment, since the positioning projection 31 of the end cap 9 and the positioning recess 32 of the casing member 30 are fitted together, the sealing device and the slider 2 are positioned. The seal device can be attached to the slider 2 at an appropriate position regardless of the dimensional difference between the diameter of the screw 10 and the diameter of the screw insertion hole when the screw 10 is fixed to the slider 2.

If the seal device is attached to the slider 2 at an appropriate position, the seal device is also arranged at an appropriate position with respect to the guide rail 1. As a result, it is possible to sufficiently obtain the assumed lubricant supply capability and dust resistance, and to extend the life of the linear motion guide bearing device.
Further, a plurality of sealing devices in which one sealing member 20 is accommodated in one casing member 30 are attached to the end of the slider 2 in the axial direction, and the positioning convex portion 33 and the positioning concave portion 32 of the casing member 30 are used. By positioning the plurality of sealing devices 30 to each other, the number of the sealing devices mounted on the slider can be set finely according to the amount of lubricant required.

As a result, the axial dimension of the slider 2 can be shortened as compared with the case where a plurality of seal members 20 are housed in one casing member 30, and the stroke sacrificed by the installation of the seal device is minimized. be able to.
For example, if the number of seal devices mounted on the inner side in the axial direction of two sliders 2 is increased and one seal device is mounted on the outer side in the axial direction of the two sliders 2, The stroke can be made long while maintaining the lubricant supply capability when an equal number of sealing devices are mounted at both ends in the axial direction.

In addition, this invention is not limited to the said embodiment, In the range which does not deviate from the summary of this invention, it can change suitably.
For example, in the above-described embodiment, the linear motion guide bearing device using rollers as the rolling elements has been exemplified, but the present invention may of course be applied to a linear motion guide bearing device using balls as the rolling elements. is there.

In the above embodiment, the positioning convex portion 31 is provided on the end cap 9 and the positioning concave portion 32 is provided on the casing member 30. However, the positioning concave portion 32 is provided on the end cap 9 and the positioning convex portion is provided on the casing member 30. The part 31 may be provided.
In addition, the rolling element rolling surface, guide rail, rolling element, slider, seal device, seal member, casing member, positioning convex portion, positioning concave portion, etc., as exemplified in the above embodiment, The number, location, etc. are arbitrary as long as the present invention can be achieved, and are not limited.

It is a figure which shows the casing member in the sealing device of the linear guide bearing apparatus which is an example of embodiment of this invention, (a) is a figure which shows the surface which faces the axial direction outward of a slider, (b) is (a). It is an AA sectional view taken on the line. It is a figure which shows an example of the sealing member accommodated in the casing member of FIG. 1, (a) is the figure seen from the axial direction of the slider, (b) is a right view of (a). It is a figure which shows an example of an end cap, (a) is the figure seen from the axial direction of the slider, (b) is a right view of (a). It is a figure which shows an example of a side seal, (a) is the figure seen from the axial direction of the slider, (b) is a right view of (a), (c) is a right view of (b). It is a figure which shows an example of the convex part for positioning, (a) is the figure seen from the axial direction of the slider, (b) is a right view of (a). It is a figure which shows the modification of the convex part for positioning, (a) is the figure seen from the axial direction of the slider, (b) is a right view of (a). It is a figure which shows the modification of the convex part for positioning, (a) is the figure seen from the axial direction of the slider, (b) is a right view of (a). It is a figure which shows the modification of the convex part for positioning, (a) is the figure seen from the axial direction of the slider, (b) is a right view of (a). It is a figure which shows the modification of the convex part for positioning, (a) is the figure seen from the axial direction of the slider, (b) is a right view of (a). It is explanatory drawing which fractured | ruptured one part for demonstrating an example of the conventional linear motion guide bearing apparatus. It is a side view of FIG.

Explanation of symbols

1 Guide rail 2 Slider 3 Rolling element rolling groove (guide rail side)
5 Rolling element rolling surface (slider side)
6 Roller (rolling element)
20 Seal member 30 Casing members 31, 33 Positioning convex portions 32, 34 Positioning concave portions

Claims (3)

  A guide rail having a rolling element rolling surface extending in the axial direction, and a rolling element rolling surface that faces the rolling element rolling surface of the guide rail, and is inserted between these rolling element rolling surfaces. A slider straddling the guide rail so as to be relatively movable in the axial direction through rolling of a large number of rolling elements, and a sealing device provided at an end portion in the axial direction of the slider, In the linear motion guide bearing device, the device includes a seal member that slides in contact with the guide rail and seals an axial end portion of the slider, and a casing member that houses at least one of the seal members. A linear guide bearing device comprising a positioning concave and convex fitting portion for positioning the slider and the slider.   A plurality of the sealing devices in which one sealing member is housed in one casing member are attached to the end of the slider in the axial direction, and a positioning uneven fitting portion for positioning the plurality of sealing devices relative to each other is provided. The linear motion guide bearing device according to claim 1, wherein:   The linear guide bearing device according to claim 1 or 2, wherein the seal member is impregnated with a lubricant so that the lubricant can be supplied to the guide rail.

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