JPH0725335U - Sealing device for linear guide - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a sealing device for a linear guide having excellent sealing performance. [Structure] A linear guide sealing device mounted on an end face in a moving direction of a slider 2 which is slidable over a guide rail 1 and relatively linearly moves on the rail, and seals a gap between an inner surface of the slider and an outer surface of the guide rail. Yes, guide rail 1
Has a side seal plate 10 of rubber or synthetic resin having a seal lip L closely contacting the outer surface of the side seal plate, and the side seal plate 10 is arranged in a state of being axially aligned before and after the side seal plate 10 via a spacing member 20. It is fixed to the outside of the end cap 2B of the slider 2. The interposing of the spacing member 20 improves the sealing performance of the side seal plate 10.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a seal device for a linear guide used in machine tools, industrial machines, measuring instruments, etc., and particularly to improve the sealing performance of a side seal to extend the life of the linear guide.

[0002]

[Prior art]

 Conventionally, for example, a linear guide as shown in FIG. 5 is known. This is provided with a guide rail 1 extending in the axial direction and a slider 2 having a substantially U-shaped transverse cross section movably straddling the guide rail 1. Two ball rolling grooves 3 extending in the axial direction are formed on both side surfaces of the guide rail 1. The slider body 2A of the slider 2 has ball rolling grooves (not shown) facing the ball rolling grooves 3 on the inner surfaces of both sleeve portions thereof. A large number of balls as rolling elements are rotatably loaded between the ball rolling grooves facing each other, and the slider 2 moves axially on the guide rail 1 through the rolling of the balls. It is designed to move. A ball return passage (not shown) penetrating in the axial direction is formed within the thickness of the sleeve portion of the slider body 2A, and an end cap 2B having a substantially U-shaped cross section attached to the front and rear ends of the slider body 2A is formed. A U-shaped curved path that connects the ball return path and the ball rolling groove 3 is formed to form an endless ball circulation path.

A ball rolling between the guide rail 1 and the slider 2 travels in a ball rolling groove as the slider 2 advances, moves to one end of the slider body 2A, and is guided to a curved path there. It makes a U-turn, moves through the ball return path to the other end of the slider body 2A, is guided to the other curved path, makes a reverse U-turn this time, and returns to the ball rolling groove.

Incidentally, g in FIG. 5 is a grease nipple for supplying a lubricant to a ball rolling portion or the like inside the slider 2. By the way, when foreign matter such as dust, dust, and cutting chips enters into the gap interposed between the guide rail 1 and the slider 2 which moves over the guide rail 1 relative to each other, and adheres to the ball rolling groove surface or the like, The smooth rolling of the ball is hindered. Therefore, a side seal 10 is attached to the outer end surface of the end cap 2B as a sealing device for preventing foreign matter from entering through the gaps at the front and rear ends in the moving direction of the slider 2.

The conventional side seal 10 is generally a reinforcing steel plate having a U-shaped cross section welded with a sealing member made of nitrile rubber or urethane rubber, for example. The end caps 2B are attached one by one to each other by bolts and slidably contact the outer surface of the guide rail 1 to prevent foreign matter from entering from the front and rear ends of the slider 2.

When the linear guide is installed in a particularly dusty place, two standard side seals, which are usually used as one piece, can be assembled together to improve the sealing performance and the wiping performance of foreign matter. I'm wearing.

[0007]

[Problems to be solved by the device]

 However, even with a sealing device in which two side seals are stacked and assembled in this way, sufficient sealing performance cannot be obtained in harsh environments, such as the extremely large amount of dust associated with wood processing. was there. Therefore, the present invention has been made by paying attention to the problems of such a conventional linear guide sealing device, and provides a linear guide sealing device that exhibits excellent sealing performance even in an extremely harsh environment. The purpose is to do.

[0008]

[Means for Solving the Problems]

 The present invention that achieves the above-mentioned object is mounted on the end face in the moving direction of a slider which is straddled over a guide rail and moves relatively linearly on the guide rail, and between the inner surface of the slider and the outer surface of the guide rail. The present invention relates to a sealing device for a linear guide that seals a gap. The sealing device has a rubber or synthetic resin side seal plate having a seal lip shaped to be in close contact with the outer surface of the guide rail. It is arranged in a state of being axially aligned in front of and behind the spacing member via a spacing member having a U-shaped vertical section, and is fixed to the outside of the end cap of the slider.

Here, it is possible to house and attach a porous member having a seal lip having a shape in close contact with the outer surface of the guide rail inside the spacing member. Further, the porous member may contain lubricating oil.

[0010]

[Action]

 In the linear guide sealing device of the present invention, the side seal plates are arranged in the axial direction in front of and behind the spacing member via the spacing member having a U-shaped vertical cross section so as to be located outside the end cap of the slider. It is configured to be fixed to. Therefore, a space is formed between the two side seals, and minute foreign matter that has entered the inside from the outer side seal stays in that space and the pressure is released, so the sealing effect of the second side seal works effectively. . In addition, since each side seal is supported independently, the seal pressure can be adjusted independently. As a result, the sealing performance such as sealing performance and foreign matter wiping performance is improved compared to the case where two side seal plates are simply stuck together.

In the case where the porous member having a shape surrounding the outer surface of the guide rail is housed and attached inside the spacing member, the dustproof performance and the wiping performance of the outer surface of the guide rail are further enhanced. By including lubricating oil in the porous member, it is possible to obtain a lubricating effect on the guide rail raceway surface and a rust preventive effect on the guide rail outer surface.

[0012]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same or corresponding parts as in the conventional case are designated by the same reference numerals. FIG. 1 shows a standard side seal plate mounted on the end surface of the linear guide in the moving direction of the slider 2. The side seal plate 10 is formed by bonding or baking a seal plate 11 made of rubber or synthetic resin to the outer surface of a side seal reinforcement plate (not shown) made of a substantially U-shaped thin steel plate that fits the outer shape of the end cap 2B. It is fixedly formed by means of. The seal plate 11 has a U-shape that is protruded more inward than the side seal reinforcement plate, and has a seal lip L that is in close contact with the outer peripheral surface of the guide rail 1 at the inner peripheral edge of the central recess 12 that receives the guide rail. is doing.

That is, at both inner edges of the central recess 12 of the seal plate 11 which face each other, the lower half semi-circular ball rolling groove 3 formed on each side surface of the guide rail 1 and the groove bottom thereof. In order to be in close contact with the cage escape groove 3a, the groove sliding contact protrusions 13 having a shape matching the shapes of the ball rolling groove 3 and the cage escape groove 3a are provided. Further, in the corner portion of the central recess 12, a quadrant shape closely contacting the upper quadrant ball rolling groove 3 formed at the ridge where the upper surface and the side surface of the guide rail 1 intersect. The groove-sliding contact protrusion 14 is provided in a protruding manner. Of the inner peripheral edge of the seal lip L, the portions other than the groove sliding contact projections 13 and the groove sliding contact projections 14 are formed in a size and shape capable of sliding contact with the upper surface of the guide rail 1 and the flat portions on both side surfaces. .

On the plate surface of the side seal plate 10, there are formed a through hole 15 with a counterbore through which the mounting bolt B1 for the end cap 2B is inserted, and a grease nipple through hole 16 also with a counterbore. FIG. 2 is a perspective view of the spacing member 20 interposed between the two side seal plates 10. The spacing member 20 of this embodiment is formed of, for example, a thin steel plate, and the size and shape of the front surface 20a and the back surface 20b of the spacing member 20 are seals protruding from the side seal plate 10 in FIG. 1 to the inner peripheral edge of the central recess. The lip L has a substantially U shape with the same size as that of the lip L removed, and the width of the side surface 20c thereof, that is, the thickness T of the spacing member 20 is arbitrary, but is about twice the thickness of the side seal plate. desirable.

Thus, a U-shaped space 21 surrounded by the front surface 20 a, the back surface 20 b, and the side surface 20 c is formed inside the spacing member 20. In addition, in order to attach the spacing member 20 to the slider, a bolt hole 22 penetrating the front surface 20a and the back surface 20b is provided, and a through hole 23 for a connector screw for attaching a grease nipple is provided.

FIG. 3 shows an embodiment of the linear guide sealing device of the present invention. The sealing device of the present invention is usually used by being attached to both front and rear ends in the moving direction of the slider 2, and the following description will be made in the order of assembling the illustrated example on one end side. First, the side seal plate 10a is applied to the end surface of the end cap 2B of the slider of the linear guide. A ring-shaped color 25 is fitted into the through hole 15 with the counterbore of the side seal plate 10a to fill the counterbore. Further, a ring-shaped collar 26 is fitted into the grease nipple through hole 16 to fill the counterbore.

Next, the spacing member 20 is put on the surface of the side seal plate 10a so as to be overlapped, the guide rail 1 is inserted into the slider 2, and is protruded from the central recess 12 of the side seal plate 10a to the outside. Then, the other side seal plate 10b is applied to the surface 20a of the spacing member 20, and the mounting bolt B1 is passed through the counterbore through hole 15 of the side sealing plate 10b, and the bolt hole 22 of the spacing member 20, the other side. After passing through each of the through holes 15 of the side seal plate 10a, it is screwed into a screw hole (not shown) provided on the end surface of the end cap 2B and tightened. As a result, the linear guide sealing device in which the side seal plate 10a, the spacing member 20, and the side seal plate 10b are integrally stacked is fixed to the end surface of the slider 2.

Finally, the connector bolt B2 is passed through the grease nipple through hole 16 of the outer side seal plate 10b, and the through holes 23 of the connector screw of the spacing member 20 and the through hole 16 of the other side seal plate 10a are inserted. After the passage, the end cap 2B is screwed into a screw hole provided in the end face of the end cap 2B, and the grease nipple g is screwed into the female screw 26 of the connector bolt B2.

By attaching the linear guide seal device thus attached to the front and rear ends of the slider body 2a, the seal lips L of the side seal plates 10a and 10b are attached to the side surface of the guide rail 1 and the ball rolling groove 3 thereof. And the groove surface of the cage escape groove 3a and the upper surface of the guide rail, respectively, to seal the openings in the front and rear of the gap between the opposing surfaces of the guide rail 1 and the slider 2 to prevent dust from entering the front and rear of the slider 2. Prevent.

In this case, since the space 21 formed by the spacing member 20 is provided between the two side seal plates 10a and 10b, the two side seal plates 10 are simply stuck together and Excellent sealing performance such as sealing performance and foreign matter wiping performance. In the above-mentioned embodiment, the space member 20 is left as the space 21. However, the present invention has a structure in which the space member 20 has a shape as shown in FIG. If a plurality of porous members 30 made of sponge etc. are stacked and arranged, the sealing performance is further improved. The porous member 30 is substantially U-shaped, and the central recess 31 is shaped and dimensioned so as to surround and closely contact the outer surface of the guide rail 1, and the through hole 32 of the side seal mounting bolt B1 and the connector bolt B2 are provided. A through hole 33 is provided.

By accommodating and attaching the porous member 30 in the spacing member 20, there is an advantage that the dustproof performance and the wiping performance of the outer surface of the guide rail are further enhanced. Further, the spacing member 20 may be provided with the oil supply hole 24 so that the porous member 30 may contain the lubricant. In that case, the lubricant contained in the porous member 30 gradually exudes and is automatically supplied to the sliding contact surface of the guide rail 1. As a result, the lubrication effect of the groove surface of the ball rolling groove 3 of the guide rail 1 and the rust prevention effect of the outer surface of the guide rail can be obtained, and a smooth operation can be obtained for a long period of time.

Further, in the present invention, the seal pressure of the front and rear side seals 10a and 10b can be changed. Effective sealing is possible by making the front side sealing pressure slightly higher than the rear side sealing pressure. In other words, the front and rear side seals are fixed via the U-shaped spacer, and the lip is elastically supported, so even if the seal pressure is increased, the seal lip due to the runout of the guide rail surface Excessive damage is prevented.

The linear guide device to which the present invention is applied may be of any type as long as the slider 2 is mounted across the guide rail 1. For example, in the above embodiment, the ball rolling groove 3 has one side. Although two rows are described, one row on one side or two or more rows may be used. In that case, it goes without saying that the groove sliding projections 13 and 14 of the side seal 10 are also formed in accordance with the ball rolling groove 3.

Further, although the case where the balls are used as the rolling elements has been described, the invention can be applied to the case where the rollers are used.

[0025]

[Effect of device]

 As described above, the seal device for a linear guide of the present invention has a rubber or synthetic resin side seal plate having a seal lip shaped to be in close contact with the outer surface of the guide rail. Since they are arranged in a state of being axially aligned in front of and behind the spacing member via a U-shaped spacing member and are fixed to the outside of the end cap of the slider, sealing performance and foreign matter wiping performance are achieved. It is possible to obtain a linear guide device having improved sealing performance such as that of the related art.

Further, in a case where a porous member having a shape surrounding the outer surface of the guide rail is housed and attached inside the spacing member, even greater dustproof performance and wiping performance of the outer surface of the guide rail can be obtained. However, if the porous member is made to contain a lubricant, a lubricating effect for the guide rail raceway surface and an anticorrosive effect for the guide rail outer surface can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of a side seal plate constituting a linear guide sealing device of the present invention.

FIG. 2 is a perspective view of an embodiment of a spacing member constituting the linear guide sealing device of the present invention.

FIG. 3 is an exploded perspective view illustrating the mounting of the linear guide sealing device of the present invention.

FIG. 4 is a perspective view of members constituting another embodiment of the linear guide sealing device of the present invention.

FIG. 5 is a perspective view of a conventional linear guide.

[Explanation of symbols]

 1 Guide Rail 2 Slider 10 Side Seal Plate 11 Rubber or Synthetic Resin Seal Plate L Seal Lip 20 Spacing Member

Claims (1)

[Scope of utility model registration request] 1. A seal for a linear guide, which is attached to an end face in a moving direction of a slider which is straddled over a guide rail and relatively linearly moves on the guide rail, and seals a gap between an inner surface of the slider and an outer surface of the guide rail. In the device, the sealing device has a side seal plate made of rubber or synthetic resin having a seal lip shaped to be in close contact with the outer surface of the guide rail, and the side seal plate has a U-shaped vertical section. A sealing device for a linear guide, which is arranged in front and rear of the spacing member via a member in an axially aligned state and is fixed to the outside of an end cap of the slider.