JP2007211821A - Linear motion guide device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a linear motion guide device capable of keeping stable dustproof performance over a long period. <P>SOLUTION: An under seal 24 for sealing a clearance 22 formed between a side surface part 2a of a guide rail 2 and an inside wall surface part 4a of a slider 4, is composed of a plurality of seal plates 28. The clearance 22 is sealed by laminating these seal plates 28 in the height direction of the guide rail 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a linear motion guide device that guides a moving body that moves linearly in a moving direction thereof.

  In various industrial machines such as machine tools, a linear motion guide device as shown in FIGS. 8 and 9 is often used as a device for guiding a moving body that moves linearly in the moving direction. This linear motion guide device includes a guide rail 2 and a slider 4, and two rail-side track grooves 6 are formed along the longitudinal direction of the guide rail 2 on the left side surface portion and the right side surface portion of the guide rail 2. Yes. The rail-side raceway grooves 6 are opposed to the slider-side raceway grooves 8 formed on the slider 4, and a spherical rolling element 10 provided between the rail-side raceway groove 6 and the slider-side raceway groove 8 includes: When the slider 4 relatively moves in the longitudinal direction of the guide rail 2, it rolls on a rolling element rolling path 12 formed between the rail side raceway groove 6 and the slider side raceway groove 8.

  Further, the linear motion guide device shown in FIGS. 8 and 9 includes two end caps 14. These end caps 14 are attached to the front end surface and the rear end surface of the slider 4, and each end cap 14 is connected to the rolling element return passage 16 formed in the slider 4 and the rolling element rolling path 12. A U-shaped curved path 18 that forms a circulation path of the rolling element 10 is formed. In the figure, reference numeral 20 denotes a side seal that seals the gap between the guide rail 2 and the end cap 14.

  In such a linear motion guide device, as shown in FIG. 10, dust such as dust passes through the gap 22 formed between the side surface portion 2 a of the guide rail 2 and the inner wall surface portion 4 a of the slider 4. If the slider 4 enters and adheres to the rolling element 10, it becomes difficult to smoothly move the slider 4 in the longitudinal direction of the guide rail 2. Therefore, in the linear motion guide device shown in FIGS. 8 and 9, the gap 22 formed between the side surface portion 2 a of the guide rail 2 and the inner wall surface portion 4 a of the slider 4 is attached to the lower surface portion of the slider 4. A seal 24 (see FIG. 10) is used to prevent dust from entering. In the figure, reference numeral 26 denotes a rivet for fixing the under seal 24 to the slider 4.

However, in the above-described conventional linear motion guide device, the under seal 24 is composed of a single seal plate 28. Therefore, if the contact pressure of the under seal 24 against the guide rail 2 is too strong, the under seal 24 is easily worn. Therefore, there is a problem that it is difficult to ensure stable dustproof performance over a long period of time. On the contrary, if the contact pressure of the under seal 24 against the guide rail 2 is too weak, a gap is generated between the side surface of the guide rail 2 and the under seal 24, making it difficult to obtain the required dustproof performance. There was a problem of becoming.
The present invention has been made paying attention to such problems, and an object of the present invention is to provide a linear motion guide device capable of maintaining stable dustproof performance over a long period of time.

In order to achieve the above object, the invention of claim 1 is directed to a linear motion guide device comprising an under seal that seals a gap formed between a side surface portion of a guide rail and an inner wall surface portion of a slider. The under seal is composed of a plurality of seal plates, and these seal plates are stacked in the height direction of the guide rail.
According to a second aspect of the present invention, in the linear motion guide device according to the first aspect, the seal plate has a seal member having a seal lip portion that contacts a side surface portion of the guide rail, and a metal member that reinforces the seal member. It consists of a reinforcing plate.

According to a third aspect of the present invention, in the linear motion guide device according to the second aspect, the material of the plurality of seal plates is harder than the seal member of the seal plate positioned on the upper side of the seal member positioned on the lower side. It is formed by.
According to a fourth aspect of the present invention, in the linear motion guide device according to the second aspect, the seal member of at least one of the plurality of seal plates is formed of a material containing a lubricant. .
According to a fifth aspect of the present invention, in the linear motion guide device according to any one of the second to fourth aspects, the seal lip portion of the seal member has an inclined surface inclined with respect to the side surface portion of the guide rail. Features.

  According to the linear motion guide device according to the first and second aspects of the present invention, the under seal that seals the gap formed between the side surface portion of the guide rail and the inner wall surface portion of the slider is composed of a plurality of plate-like seal members. In addition, by laminating these seal members in the height direction of the guide rail, the seal performance of the under seal is improved compared to the one in which the under seal is composed of a single plate-like seal member, so stable dustproof performance Can be kept for a long time.

According to the linear motion guide device of the third aspect of the present invention, the lower seal plate is less likely to wear than the upper seal plate, so that stable dustproof performance can be maintained for a longer period of time. .
According to the linear motion guide device of the fourth aspect of the present invention, since the frictional resistance generated between the seal lip portion of the seal member and the guide rail can be reduced by the lubricant, wear of the seal lip portion can be suppressed. Thus, stable dustproof performance can be maintained for a longer period of time.
According to the linear motion guide device of the fifth aspect of the present invention, since the space portion is formed between the upper seal lip portion and the lower seal lip portion, and this space portion acts as a lubricant reservoir, The wear of the seal can be suppressed, whereby stable dustproof performance can be maintained for a longer period.

Hereinafter, the first embodiment of the present invention will be described with reference to FIGS. 1 and 2.
FIG. 1 is a view showing a main part of a linear guide apparatus according to a first embodiment of the present invention. As shown in the figure, a slit 30 formed in a slider 4 has a side surface of a guide rail 2. An under seal 24 that seals the gap 22 formed between the portion 2 a and the inner wall surface portion 4 a of the slider 4 is incorporated. The under seal 24 includes two seal plates 28, and these seal plates 28 are stacked in the height direction of the guide rail 2.

FIG. 2 is a cross-sectional view of a seal plate constituting an under seal. As shown in FIG. 2, the seal plate 28 includes a seal member 32 having a seal lip portion 32a that contacts a side surface portion of the guide rail, and the seal member. It is composed of a metal reinforcing plate 34 that reinforces the member 32.
The seal lip portion 32a has an inclined surface 36 (see FIG. 2) inclined with respect to the side surface portion of the guide rail, and the two seal plates 28 constituting the under seal 24 are inclined with respect to the seal lip portion 32a. It overlaps with the height direction of the guide rail 2 so that the surface 36 may face upward. The seal member 32 of the seal plate 28 located on the upper side of the two seal plates 28 constituting the under seal 24 is made of rubber, and the seal member 32 of the seal plate 28 located on the lower side is located on the upper side. The seal plate 28 is made of a material harder than the seal member 32 (for example, an elastomer resin).

  In the first embodiment configured as described above, the under seal 24 that seals the gap 22 formed between the side surface portion 2 a of the guide rail 2 and the inner wall surface portion 4 a of the slider 4 is provided with two seal plates 28. Since these seal plates 28 are laminated in the height direction of the guide rail 2, the sealing performance of the under seal 24 is improved as compared with the case where the under seal is constituted by a single seal plate. The dustproof performance can be maintained for a long time.

Further, the seal member 32 of the seal plate 28 positioned on the lower side of the two seal plates 28 is formed of a material harder than the seal member 32 of the seal plate 28 positioned on the upper side. Since the seal plate 28 is less likely to wear than the seal plate 28 positioned on the upper side, stable dustproof performance can be maintained for a longer period of time.
Further, by providing an inclined surface 36 inclined to the side surface 2a of the guide rail 2 in the seal lip 32a of the seal member 32, the gap between the upper seal lip 32a and the lower seal lip 32a is increased. Since a space 38 (see FIG. 1) is formed and this space 38 acts as a lubricant reservoir, it is possible to suppress wear of the under seal 24, thereby maintaining stable dustproof performance for a longer period of time. it can.

In addition, this invention is not limited to embodiment mentioned above. For example, in the first embodiment, the seal member 32 of the seal plate 28 located on the upper side of the two seal plates 28 constituting the under seal 24 is made of rubber. However, as shown in FIG. The sealing member 32 of at least one sealing plate 28 among the plurality of sealing plates 28, preferably the sealing member 32 of the sealing plate 28 located on the upper side may be formed of rubber or resin containing a lubricant.
According to such a configuration, since the frictional resistance generated between the seal lip portion 32a of the seal member 32 and the guide rail 2 can be reduced by the lubricant, wear of the seal lip portion 32a can be suppressed. Stable dustproof performance can be maintained for a longer period.

In the first embodiment, the under seal 24 that seals the gap 22 formed between the side surface portion 2a of the guide rail 2 and the inner wall surface portion 4a of the slider 4 is composed of two seal plates 28. As shown in FIG. 4, the same effect can be obtained even if the under seal 24 is constituted by three or more seal plates 28.
Furthermore, in the first embodiment, the two seal plates 28 are overlapped in the height direction of the guide rail 2 so that the inclined surfaces 36 of the two seal lip portions 32a face upward. As shown, the two seal plates 28 may be overlapped in the height direction of the guide rail 2 so that the inclined surfaces 36 of the two seal lip portions 32a face each other.

In the first embodiment, a seal lip portion having a wedge shape is used as the seal lip portion 32a contacting the side surface portion 2a of the guide rail 2, but the seal lip portion 32a having a cross section as shown in FIG. May be used.
Furthermore, in the first embodiment, the under seal 24 is inserted into the slit 30 formed in the slider 4 to seal the gap 22 between the guide rail 2 and the slider 4. However, the resin or metal rivet is used. The under seal 24 may be fixed to the lower surface of the slider 4 to seal the gap 22.

It is a figure which shows the principal part of the linear motion guide apparatus which concerns on the 1st Embodiment of this invention. It is sectional drawing of the sealing board shown in FIG. It is a figure which shows the principal part of the linear motion guide apparatus which concerns on the 2nd Embodiment of this invention. It is a figure which shows the principal part of the linear motion guide apparatus which concerns on the 3rd Embodiment of this invention. It is a figure which shows the principal part of the linear motion guide apparatus which concerns on the 4th Embodiment of this invention. It is a figure which shows the principal part of the linear motion guide apparatus which concerns on the 5th Embodiment of this invention. It is a figure which shows the principal part of the linear motion guide apparatus which concerns on the 6th Embodiment of this invention. It is a front view of the conventional linear motion guide apparatus. It is a partial cross section top view of the linear motion guide apparatus shown in FIG. It is an enlarged view of the A section shown in FIG.

Explanation of symbols

2 Guide rail 4 Slider 6 Rail side raceway groove 8 Slider side raceway groove 10 Rolling body 12 Rolling body rolling path 14 End cap 16 Rolling body return path 18 Curved path 20 Side seal 22 Gap 24 Under seal 26 Rivet 28 Seal plate 30 Slit 32 Seal member 32a Seal lip part 34 Reinforcement plate 36 Inclined surface 38 Space part

Claims (5)

  In a linear motion guide device provided with an under seal that seals a gap formed between a side surface portion of a guide rail and an inner wall surface portion of a slider, the under seal is composed of a plurality of seal plates, and these seal plates are A linear motion guide device, wherein the guide rails are stacked in the height direction.   The linear motion guide device according to claim 1, wherein the seal plate includes a seal member having a seal lip portion that contacts a side surface portion of the guide rail, and a reinforcing plate that reinforces the seal member.   The linear motion guide device according to claim 2, wherein a seal member of a lower seal plate among the plurality of seal plates is formed of a material harder than a seal member of an upper seal plate. Linear motion guide device.   The linear motion guide device according to claim 2, wherein a seal member of at least one of the plurality of seal plates is formed of a material containing a lubricant.   5. The linear motion guide device according to claim 2, wherein the seal lip portion of the seal member has an inclined surface that is inclined with respect to a side surface portion of the guide rail. 6. .

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