JP2006057795A - Linear guide bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a linear guide bearing device having high dust-proof effect improving sealing performance by removing fine foreign matters and by suppressing frictional heat and abrasion of a seal in sliding of the seal. <P>SOLUTION: In this linear guide bearing device comprising a seal member 15 mounted on an axial end part of a slider 2 and slidably kept into contact with a guide rail 1 to seal the axial end part of the slider 2, the seal member 15 is composed of a porous felt material impregnated with a lubricant, and the plurality of seal members 15 are arranged in the axial direction of the slider 2 in such a state that densities of the seal members 15 are different from each other. <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 motion guide bearing device, for example, the one shown in FIG. 3 is known.
This linear motion guide bearing device includes a guide rail 1 extending in the axial direction, and a slider 2 straddling the guide rail 1 so as to be relatively movable in the axial direction.
Roller element rolling grooves 3 extending in the axial direction are formed on both side surfaces of the guide rail 1. The slider body 2 A of the slider 2 has rolling element rolling grooves on the inner side surfaces of both sleeve portions 4. 3 is formed with a rolling element rolling groove 7 opposite to the rolling element 7. A large number of balls B as an example of rolling elements are slidably loaded between the rolling grooves 3 and 7 facing each other, and the slider 2 is moved through the rolling of these balls B. It can move relative to the guide rail 1 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.
For this reason, a rolling element passage 8 penetrating in the axial direction is formed in the sleeve portion 4 of the slider body 2A, and substantially U-shaped end caps 5 are respectively attached to both ends of the slider body 2A. 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 7 and the rolling element passage 8. A circular orbit is formed. In FIG. 3, reference numeral 11 denotes a side seal fixed to the end face of the slider body 2A together with the end cap 5 via a screw 12 or the like, 10 denotes a tapped hole of the screw 12 formed on the end face of the slider body 2A, and 13 denotes A grease supply nipple 14 is a bolt insertion hole for fixing the guide rail 1.

In the conventional linear motion guide bearing device, since the side seal 11 that seals the end of the slider 2 is a rubber seal, it is difficult to completely remove fine foreign matters, and the side seal 11 and the guide rail 1 are There is a problem that a sufficient dustproof effect cannot be obtained due to heat generation due to sliding friction and a decrease in sealing performance due to lip wear during sliding.
The present invention has been made to eliminate such inconveniences, and can remove fine foreign matters, and can improve the sealing performance by suppressing frictional heat and seal wear during sliding of the seal. It is an object of the present invention to provide a linear motion guide bearing device having an excellent dustproof effect.

To achieve the above object, the invention according to claim 1 includes a guide rail having a rolling element rolling groove extending in the axial direction, and a rolling element rolling groove facing the rolling element rolling groove 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 grooves of both the rolling elements, and a shaft of the slider A linear motion guide bearing device provided with a sealing member provided at an end in a direction and sealingly contacting an end of the slider in an axial direction in sliding contact with the guide rail,
The sealing member is formed of a porous felt material, and a plurality of the sealing members are arranged in the axial direction of the slider, and at least two sealing members have different densities.
The invention according to claim 2 is characterized in that, in claim 1, the seal member is impregnated with a lubricant.

According to the first aspect of the present invention, since the sealing member for sealing the end portion in the axial direction of the slider is formed of the porous felt material, fine foreign matters and dust can be effectively removed, and the guide is provided. The frictional force of the seal with the rail is reduced, and heat generation due to sliding friction and lip wear during sliding can be suppressed, thereby improving the sealing performance and obtaining an excellent dustproof effect.
Further, since a plurality of seal members are arranged in the axial direction of the slider and the densities of at least two seal members are made different, a foreign material having high hardness is effectively removed with a relatively high strength and high density seal member. be able to.

  In the invention of claim 2, in addition to the invention of claim 1, by impregnating the seal member with the lubricant, the seal member can have a lubricating effect as well as a dustproof effect, and the dense seal member can supply the lubricant. Since the seal member having a higher speed and lower density has a characteristic that the supply speed of the lubricant becomes slower, the lubricating performance suitable for the application can be obtained by changing the density of each seal member according to the application.

  Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a partially broken perspective view for explaining a main part of a linear guide bearing device as an example of an embodiment of the present invention, and FIG. 2 is a view showing an example of a lubricant supply member. In this embodiment, parts that are the same as those of the conventional linear motion guide bearing device already described with reference to FIG.

As shown in FIG. 1, a linear guide bearing device that is an example of an embodiment of the present invention is a seal that slides in contact with a rolling element rolling groove 3 of a guide rail 1 and seals an end portion in the axial direction of a slider 2. A plurality of members 15 are arranged in the axial direction of the slider 2 while being accommodated in the case 20 on the outer surface side of the end cap 5.
The seal member 15 is formed of a porous felt material made of a fiber such as a synthetic resin containing a lubricant such as lubricating oil or grease. As shown in FIG. A slidable contact portion 17 is provided on the inner side of the U-shaped end portions so as to slidably contact the rolling element rolling groove 3 of the guide rail 1 and supply a lubricant. Further, at least two seal members 15, in the present embodiment, the seal members 15 have different densities.

  Thus, in this embodiment, since the sealing member 15 that seals the end portion of the slider 2 in the axial direction is formed of the porous felt material, fine foreign matters and dust can be effectively removed. Further, the seal friction force with the guide rail 1 is reduced, so that heat generation due to sliding friction and lip wear during sliding can be suppressed, whereby the sealing performance is improved and an excellent dustproof effect can be obtained.

Further, since a plurality of seal members 15 are arranged in the axial direction of the slider 2 and the density of each seal member 15 is made different, a foreign material having high hardness can be effectively removed with the seal member 15 having a relatively high strength. Can be removed.
Furthermore, since the seal member 15 is impregnated with the lubricant, it can have a dustproof effect and a lubrication effect, and the seal member 15 with a higher density has a higher supply rate of the lubricant, and the seal member 15 with a lower density has a lower density. Since the supply rate of the lubricant is slow, the lubrication performance suitable for the application can be obtained by changing the density of each seal member 15 according to the application.
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.

It is the perspective view which fractured | ruptured a part for demonstrating the principal part of the linear guide bearing apparatus which is an example of embodiment of this invention. It is a figure which shows an example of a lubricant supply member. It is the perspective view which fractured | ruptured a part for demonstrating the conventional linear motion guide bearing apparatus.

Explanation of symbols

1 Guide rail 2 Slider 3 Rolling element rolling groove (guide rail side)
7 Rolling element rolling groove (slider side)
B ball (rolling element)
15 Seal member 17 Sliding part

Claims (2)

A guide rail having rolling element rolling grooves extending in the axial direction, and a rolling element rolling groove facing the rolling element rolling groove of the guide rail, and is inserted between these rolling element rolling grooves. A slider straddled on the guide rail so as to be relatively movable along the axial direction through rolling of a large number of rolling elements, and provided at an end portion in the axial direction of the slider. A linear motion guide bearing device comprising a seal member for sealing an axial end portion of the slider,
A linear motion guide bearing device, wherein the seal member is formed of a porous felt material, a plurality of seal members are arranged in the axial direction of the slider, and at least two seal members have different densities.   The linear guide bearing device according to claim 1, wherein the seal member is impregnated with a lubricant.

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