JP2015178841A - Side seal of linear guide device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a side seal which can be used without exchanging a seal member in the case that a rail cover is arranged on an upper face of a guide rail and that the rail cover is not arranged thereon, as the side seal of a linear guide device which is composed of the seal member, a cover plate and a cover which are independently formed.SOLUTION: A base part of an upper-side seal part 1a of a seal member 1 has holding-plate engagement parts 121, 123a which are engaged with a holding plate 2 in irregular fitment at one face 13 in a thickness direction, and has cover engagement parts 124, 14 which are engaged with a cover 3 in a plurality of positions in irregular fitment in a vertical direction or by the contact of faces at the other face 14 in the thickness direction. An upper plate part 2a of the holding plate 2 has seal holding parts 291, 292 which can hold the holding-plate engagement part 123a in a plurality of positions in the vertical direction. An upper side part 31 of the cover 3 has a seal engagement part 33 which is engaged with the cover engagement parts 124, 14.

Description

  The present invention relates to a side seal that has a seal member, a holding plate, and a cover that are separately formed and is used by being fixed to an end portion in a moving direction of a slider that constitutes a linear motion guide device.

FIG. 9 shows a conventional example of the linear motion guide device. The linear motion guide device includes a guide rail 100, a slider (also referred to as a “bearing”) 200, and a plurality of rollers (rolling elements) 300. The guide rail 100 and the slider 200 have rolling surfaces 110 and 210 that face each other and form a rolling path of the roller 300.
The slider 200 is divided in the length direction of the guide rail 100 into a slider main body 201, end caps 202 fixed to both ends thereof, and side seals 203 fixed to both ends thereof. The rolling surface 210 is formed on the slider body 201. The side seals 203 disposed at both ends of the slider 200 in the linear motion direction seal the space between the slider 200 and the upper surface and both side surfaces of the guide rail 100 with lip portions.

The slider 200 also has a return path 221 of the roller 300 and a direction changing path 222 that connects the return path 221 and the rolling path. The return passage 221 is formed in the slider body 201, and the direction changing path 222 is formed in the end cap 202. A female screw 205 for attaching a table or the like with screws is formed on the upper surface of the slider 200.
Mounting holes for the grease nipple 400 are formed in the side seal 203 and the end cap 202. Lubricant is introduced from the grease nipple 400 into the oil passage of the end cap 202 to lubricate the linear motion guide device. The side seal 203 and the end cap 202 are fixed to the slider body 201 with bolts 500. The guide rail 100 is formed with an attachment hole 120 for attaching the guide rail 100 to the attached portion such as a base with a bolt.

In this linear motion guide device, a rolling path of the rolling element is constituted by the rolling path, the return path, and the direction changing path, and one of the guide rail 100 and the slider 200 is connected via a roller 300 circulating in the circulating path. Moves linearly relative to the other.
As a conventional example of the side seal of such a linear motion guide device, a base portion of a rubber seal member is fixed to a metal holding plate, and a lip portion of the seal member is brought into contact with an upper surface and both side surfaces of a guide rail. What is used. Further, it has been proposed that the side seal is composed of a separately formed seal member, a holding plate for holding the seal member, and a cover (scraper).

  In Patent Document 1, a side seal holding plate (case portion) and a seal member (seal portion) having a lip portion (seal lip) are configured as separate members, and a guide rail is provided on the opposite side of the seal member holding plate. It is described that a scraper portion is provided to be opposed to the outer surface with a gap. The holding plate and the seal part are engaged with each other by a concave-convex fit. According to this side seal, a relatively large foreign matter is first removed at the scraper portion, so that the life of the seal lip is extended and the operability is improved.

  In Patent Document 2, in a side seal composed of a sealing member, a holding plate, and a cover, the sealing plate is sealed to the holding plate for the purpose of preventing the sealing member from being deteriorated in dust resistance and wear resistance and from falling off the holding plate. It describes that a member alignment portion is provided and a gap is provided between the concave portion of the holding plate and the seal member.

Japanese Patent Laid-Open No. 2007-211900 Japanese Patent No. 5316700

  Conventionally, the linear motion guide device may be used with a rail cover disposed on the upper surface of the guide rail, or may be used without a rail cover. When the rail cover is disposed, the upper surface of the guide rail is positioned higher by the thickness of the rail cover. Therefore, in either case, it is necessary to use different side seals in order to make the fastening margin of the lip portion with respect to the upper surface of the guide rail the same.

That is, in the case of a side seal in which the base portion of the seal member is fixed to the holding plate, it is necessary to prepare two side seals. In the case of a side seal composed of a seal member formed separately, a holding plate for holding the seal member, and a cover (scraper), two types of seal members need to be prepared.
An object of the present invention is to provide a case where a rail cover is arranged on the upper surface of a guide rail and a rail cover as a side seal of a linear guide device including a seal member, a holding plate, and a cover (scraper) formed separately. It is to provide a device that can be used without replacement of the seal member when it is not arranged.

In order to solve the above-described problems, a side seal of a linear guide apparatus according to one aspect of the present invention has the following configurations (1) to (6).
(1) It has a seal member, a holding plate and a cover which are separately formed. It is used by being fixed to the slider moving direction end of the slider constituting the linear motion guide device. The holding plate is disposed closer to the slider than the cover, and the seal member is disposed between the holding plate and the cover.
(2) The seal member includes an upper seal portion having a lip portion that is brought into contact with an upper surface of the guide rail constituting the linear motion guide device, and each side seal portion having a lip portion that is brought into contact with each side surface of the guide rail. Consists of. The upper seal part and the side seal part have a base part held by the holding plate.

(3) The holding plate includes an upper plate portion and both side plate portions facing each other with a gap between the upper surface and both side surfaces of the guide rail. The cover includes an upper portion and both side portions that face the upper surface and both side surfaces of the guide rail with a gap therebetween.
(4) The base portion of the upper seal portion has a holding plate engaging portion that engages with the upper plate portion of the holding plate at a plurality of positions in the vertical direction by fitting unevenness on one surface (surface on the slider side). In addition, the cover engaging with the other surface in the thickness direction (the surface opposite to the slider) at a plurality of positions in the vertical direction by fitting the upper portion of the cover with the unevenness or contacting the surfaces. Part.

(5) The upper plate portion of the holding plate has a seal holding portion capable of holding the holding plate engaging portion of the base at a plurality of positions in the vertical direction. The upper part of the cover has a seal engaging part that engages with a cover engaging part of the base part of the upper seal part at a plurality of positions in the vertical direction by fitting or uneven fitting or contact between surfaces.
(6) In the seal member, the engagement position of the cover engagement portion with respect to the seal engagement portion changes in response to a change in the engagement position of the holding plate engagement portion with respect to the seal holding portion. The position of the lip portion in the vertical direction is changed by the change in the position of the seal member in the slider moving direction.

  The side seal of this aspect is used by changing the position of the lip portion in the vertical direction by using only one seal member and changing the position of the seal member in the slider moving direction. be able to.

  The side seal of the present invention is a side seal of a linear motion guide device comprising a seal member, a holding plate and a cover (scraper) that are separately formed, and the rail cover is disposed on the upper surface of the guide rail. When the rail cover is not disposed, the seal member can be used without replacement.

It is a perspective view which shows the seal member, holding plate, and cover which are the side seal component parts of embodiment. It is a front view which shows the sealing member of embodiment. It is sectional drawing (equivalent to AA sectional drawing of FIG. 2) which shows the multiple types of sealing member of embodiment. It is a front view which shows the holding plate of embodiment. It is BB sectional drawing of FIG. It is sectional drawing which shows the cover of embodiment. It is sectional drawing which shows the upper part of the guide rail of the state which attached the side seal of embodiment to the linear guide apparatus, Comprising: (a) is a case where a rail cover is not arrange | positioned, (b) is a rail cover arrange | positioned The case where it is done is shown. It is sectional drawing which shows the side part of the guide rail of the state which attached the side seal of embodiment to the linear motion guide apparatus (a holding plate is CC cross section of FIG. 4), Comprising: (a) is a rail cover arrange | positioned. (B) shows the case where the rail cover is arrange | positioned. It is a partially broken perspective view which shows the prior art example of a linear guide apparatus.

Embodiments of the present invention will be described below, but the present invention is not limited to these embodiments.
The side seal 4 of this embodiment can be used in place of the side seal 203 of the linear motion guide device shown in FIG. 9 described above, and the seal member 1, the holding plate 2 and the cover 3 having the shape shown in FIG. Consists of. The holding plate 2 is disposed closer to the slider than the cover 3.

As shown in FIG. 2, the seal member 1 is arranged as seen from the front side, and is arranged on the upper side of the guide rail 100 (FIG. 9) and on the left and right sides of the guide rail 100. It is divided into a side seal portion 1b.
The upper seal portion 1 a has a lip portion 11 a that is brought into contact with the upper surface of the guide rail 100. The side seal portion 1 b has a lip portion 11 b that is brought into contact with the left and right side surfaces of the guide rail 100. The upper seal portion 1 a and the side seal portion 1 b have a base portion 12 that is held by the holding plate 2. That is, the seal member 1 is divided into the lip portion 11 and the base portion 12 in each direction in which the upper seal portion 1a and the side seal portion 1b face the guide rail.

  As shown in FIG. 3, the base 12 of the seal member 1 has a first recess (holding plate engaging portion) 121 formed on a first surface 13 which is one surface in the thickness direction (surface on the slider side). . The base portion 12 is divided into a base end portion 122 and a front end portion 123 by the first recess 121. The first recess 121 includes a bottom 121a, a wall 121b on the proximal end 122 side, and a wall 121c on the distal end 123 side.

  The distal end portion 123 of the base portion 12 protrudes from the base end portion 122 toward the slider. That is, the first surface 13a of the distal end portion 123 is closer to the slider than the first surface 13 of the proximal end portion 122, and the corner portion 123a protruding from the proximal end portion 122 of the distal end portion 123 to the slider side is also related to the holding plate. It is a joint. The second surface 14, which is the other surface in the thickness direction of the base portion 12 (the surface opposite to the slider), is the same in the base end portion 122 and the tip end portion 123.

In the upper seal portion 1a, a second concave portion (a cover engaging portion that engages with the cover 3 by fitting the concave and convex portions) 124 is formed on the second surface 14 of the distal end portion 123 of the base portion 12. In the side seal portion 1 b, the second concave portion 124 is not formed on the second surface 14 of the distal end portion 123 of the base portion 12. The lip portion 11 of the seal member 1 is inclined from the first surface 13 side to the second surface 14 side.
As shown in FIGS. 1 and 4, the holding plate 2 has substantially the same surface shape as the end cap 202 (FIG. 9) constituting the slider 200 (FIG. 9), and is arranged on the upper side of the guide rail 100. It consists of a plate portion 2 a and side plate portions 2 b arranged on the left and right sides of the guide rail 100. A through hole 52 through which the bolt 500 (FIG. 9) is passed and a through hole 42 to which the grease nipple 400 (FIG. 9) is attached are formed in the upper plate portion 2a. A through hole 52 through which the bolt 500 passes is formed in the side plate portion 2b. Inside the holding plate 2 (guide rail side), a seal holding portion 20 that holds the base portion 12 of the seal member 1 is formed.

  As shown in FIG. 5, the seal holding unit 20 includes a first holding surface 21, a second holding surface 22, a third holding surface 23, and a fourth holding surface 24 in the upper plate portion 2 a of the holding plate 2. The fifth holding surface 25, the sixth holding surface 26, the seventh holding surface 27, and the eighth holding surface 28. The first holding surface 21 is a surface with which the third surface 15 that is the outermost surface (side away from the guide rail) of the seal member 1 can come into contact. The second holding surface 22 is a surface that can contact the first surface 13 of the base end portion 122.

  The third holding surface 23 is a surface with which the wall surface 121b on the base end portion 122 side of the recess 121 of the seal member 1 can come into contact. The fourth holding surface 24 is a surface with which the bottom surface 121a of the recess 121 of the seal member 1 can come into contact. The fifth holding surface 25 and the seventh holding surface 27 are surfaces with which the wall surface 121c on the tip end portion 123 side of the recess 121 of the seal member 1 can contact, and the seventh holding surface 27 is closer to the guide rail than the fifth holding surface 25. And it is arranged on the slider side.

The third holding surface 23, the fourth holding surface 24, and the fifth holding surface 25 form a convex portion 29 into which the concave portion 121 of the seal member 1 is fitted. The sixth holding surface 26 and the eighth holding surface 28 are surfaces with which the first surface 13a of the distal end portion 123 of the seal member 1 can come into contact.
The second holding surface 22, the fourth holding surface 24, the sixth holding surface 26, and the eighth holding surface 28 are parallel to the plate surface of the holding plate 2. The fourth holding surface 24, the sixth holding surface 26, the second holding surface 22, and the eighth holding surface 28 are arranged in this order from the opposite side of the slider toward the slider side. The first holding surface 21, the third holding surface 23, the fifth holding surface 25, and the seventh holding surface 27 are orthogonal to the plate surface of the holding plate 2 and are directed from the opposite side of the guide rail toward the guide rail side. Arranged in order. The convex portion 29 protrudes from the second holding surface 22 to the opposite side (cover side) of the slider.

That is, in the upper plate portion 2 a of the holding plate 2, as shown in FIGS. 4 and 5, the first concave portion 291 composed of the fifth holding surface 25 and the sixth holding surface 26 of the seal holding portion 20, and the seventh holding By the second concave portion 292 composed of the surface 27 and the eighth holding surface 28, the corner portion (holding plate engaging portion) 123a of the base portion 12 of the seal member 1 can be held at two places in the vertical direction.
As shown in FIGS. 4 and 5, the seal holding portion 20 of the side plate portion 2 b includes a first holding surface 28 and a fourth holding surface 24 that extend to the eighth holding surface 24 instead of the first recessed portion 291 and the second recessed portion 292. A third recess 293 made of the seventh holding surface 27 is formed. That is, the fifth holding surface 25 and the sixth holding surface 26 are not formed on the seal holding portion 20 of the side plate portion 2b. Further, the third holding surface 23, the fourth holding surface 24, and the seventh holding surface 27 form a convex portion 29 a into which the concave portion 121 of the seal member 1 is fitted.

  As shown in FIG. 1, the cover 3 has substantially the same surface shape as the end cap 202 (FIG. 9) constituting the slider 200 (FIG. 9), and a gap is formed between the upper surface of the guide rail 100 (FIG. 9). The upper part 31 which opposes, and the left-and-right side surfaces of the guide rail 100 (FIG. 9) and the upper part 32 which opposes through a clearance gap are comprised. A through hole 53 through which the bolt 500 (FIG. 9) passes and a through hole 43 to which the grease nipple 400 (FIG. 9) is attached are formed in the upper portion 31. The side portion 32 is formed with a through hole 53 through which the bolt 500 (FIG. 9) is passed.

  As shown in FIG. 6, in the upper portion 31, the first recess 31 (cover engagement portion) 124 of the seal member 1 is fitted to the first surface 31 a that is one surface (surface on the slider side) of the cover 3 in the thickness direction. A mating convex portion (seal engaging portion) 33 is formed. In the side portion 32, the convex portion 33 is not formed on the first surface 31 a of the cover 3. Further, a part of the first surface 31 a of the cover 3 is a seal engaging portion that engages with the second surface (cover engaging portion) 14 of the seal member 1 by contact between the surfaces.

That is, the upper portion 31 of the cover 3 can be engaged with the second concave portion 124 or the second surface 14 of the base portion 12 of the seal member 1 at two locations in the vertical direction by the convex portion 33 and the first surface 31a. Yes. The convex portion 33 of the upper portion 31 of the cover 3 and the second concave portion 124 of the seal member 1 are fitted with irregularities, and the first surface 31a of the cover 3 and the second surface 14 of the seal member 1 are engaged by surface-to-surface contact. To do.
The seal member 1 is made of rubber or a thermoplastic elastomer. Examples of the rubber to be used include nitrile rubber, acrylic rubber, silicone rubber, and fluorine rubber. Examples of the thermoplastic elastomer include polyester elastomers and urethane elastomers. The holding plate 2 is made of a synthetic resin such as POM (polyoxymethylene). The cover 3 is made of metal such as SUS304.

The side seal 4 of this embodiment is used as shown in FIGS.
When the linear motion guide device is used without arranging the rail cover 5 on the upper surface 101 of the guide rail 100, as shown in FIGS. 7A and 8A, the base end 122 of the seal member 1 The first surface 13 is brought into contact with the second holding surface 22 of the holding plate 2, the first surface 13 a of the distal end portion 123 is brought into contact with the eighth holding surface 28, and the first surface 31 a of the cover 3 is held by the seal of the holding plate 2. The side seal 4 is assembled by making it contact the surface in which the part 20 is formed. Then, the side seal 4 is fixed to the slider 220 with a bolt inserted through the through hole 53 of the cover 3 and the through hole 52 of the holding plate 2. Accordingly, the lip portion 11a of the upper seal portion 1a contacts the upper surface 101 of the guide rail 100, and the lip portion 11b of the side seal portion 1b contacts the side surface 102 and the rolling surface 110 of the guide rail 100.

  In this state, in the cross section showing the upper portion of the guide rail, the tip of the convex portion 33 of the cover 3 contacts the second surface 14 of the seal member 1 as shown in FIG. Further, the corner 123 a of the seal member 1 fits into the second recess 292, and the projection 29 of the holding plate 2 fits into the recess 121 of the seal member 1. Further, between the third surface 15 of the sealing member 1 and the first holding surface 21 of the holding plate 2, between the second surface 14 of the sealing member 1 and the first surface 31 a of the cover 3, the base 12 of the sealing member 1. There are gaps between the front end portion 123 and the first concave portion 291 of the holding plate 2.

In the cross section showing the side portion of the guide rail, as shown in FIG. 8A, the corner 123 a of the seal member 1 is fitted into the third recess 293, and the projection 29 a of the holding plate 2 is the recess of the seal member 1. Fits 121. Further, there are gaps between the third surface 15 of the sealing member 1 and the first holding surface 21 of the holding plate 2, and between the second surface 14 of the sealing member 1 and the first surface 31 a of the cover 3. To do.
When the rail cover 5 is arranged on the upper surface 101 of the guide rail 100 and the linear motion guide device is used, the portion arranged on the upper side of the guide rail when the side seal 4 is assembled is shown in FIG. As described above, the convex portion 33 of the cover 3 is fitted into the concave portion 124 of the seal member 1, and the second surface 14 of the seal member 1 is brought into contact with the first surface 31 a of the cover 3. In the part arrange | positioned at the side of a guide rail, the 2nd surface 14 of the sealing member 1 is made to contact the 1st surface 31a of the cover 3, as shown in FIG.8 (b). Then, the side seal 4 is fixed to the slider 220 with a bolt inserted through the through hole 53 of the cover 3 and the through hole 52 of the holding plate 2. Accordingly, the lip portion 11a of the upper seal portion 1a contacts the rail cover 5, and the lip portion 11b of the side seal portion 1b contacts the side surface 102 and the rolling surface 110 of the guide rail 100.

  In this state, in the cross section showing the upper portion of the guide rail, the third surface 15 of the seal member 1 contacts the first holding surface 21 of the holding plate 2 as shown in FIG. The corner 123 a is fitted into the first recess 291 of the holding plate 2. Between the base end portion 122 of the base portion 12 of the sealing member 1 and the second holding surface 22 of the holding plate 2, between the first surface 13 a of the sealing member 1 and the eighth holding surface 28 of the holding plate, and the holding plate 2. There are gaps between the convex portion 29 and the concave portion 121 of the seal member 1.

  In the cross section showing the side portion of the guide rail, a gap exists between the third surface 15 of the seal member 1 and the first holding surface 21 of the holding plate 2 as shown in FIG. Further, the corner 123 a of the seal member 1 comes into contact with the front side (the cover 3 side) of the third recess 293 of the holding plate 2. There are gaps between the first surface 13a of the sealing member 1 and the eighth holding surface 28 of the holding plate, and also between the convex portion 29a of the holding plate 2 and the concave portion 121 of the sealing member 1.

  As described above, the side seal 4 of this embodiment uses only one seal member 1 and is assembled by changing the position of the seal member 1 in the slider moving direction. Can be used by changing. For this reason, the seal member 1 can be used without being replaced when the rail cover 5 is disposed on the upper surface 101 of the guide rail 100 and when the rail cover 5 is not disposed.

DESCRIPTION OF SYMBOLS 1 Seal member 1a Upper side seal part 1b Side seal part 11 Lip part 11a Lip part made to contact the upper surface of a guide rail 11b Lip part made to contact the side surface of a guide rail 12 Base part 121 First recessed part (holding plate engaging part) )
121a Bottom portion of the first recess 121b Wall surface on the proximal end side of the first recess 121c Wall surface on the distal end side 122 Base end portion of the base portion 123 Base end portion of the base portion 123a Corner portion of the front end portion (holding plate engaging portion)
124 Second concave portion of the seal member (cover engaging portion that engages with an uneven fit)
13 First surface of seal member (one surface in thickness direction)
13a 1st surface of the front-end | tip part of a sealing member 14 2nd surface (The other surface of a thickness direction, the cover engaging part engaged by contact of surfaces)
DESCRIPTION OF SYMBOLS 15 3rd surface of a sealing member 2 Holding plate 2a Upper part 2b of holding plate Side part of holding plate 20 Seal holding part 21 First holding surface 22 Second holding surface 23 Third holding surface 24 Fourth holding surface 25 Fifth Holding surface 26 Sixth holding surface 27 Seventh holding surface 28 Eighth holding surface 29 Convex portion 29a Convex portion 291 First concave portion 292 of the seal holding portion 292 Second concave portion of the seal holding portion 293 Third concave portion of the seal holding portion 3 Cover 31 Upper part of cover 32 Side part of cover 4 Side seal 5 Rail cover 42 Through hole for attaching grease nipple 43 Through hole for attaching grease nipple 52 Through hole for passing bolt 53 Through hole for passing bolt 100 Guide rail 101 Upper surface of guide rail 110 Rolling surface of guide rail 200 Slider 201 Slider body 202 End cap 203 Side seal 05 internal thread 210 slider rolling surface 221 return passage 222 the direction changing passage 300 rollers (rolling elements)
400 Grease nipple 500 bolt

Claims (1)

It has a seal member, a holding plate, and a cover that are separately formed, and is used by being fixed to the slider moving direction end of the slider that constitutes the linear motion guide device.
The holding plate is disposed closer to the slider than the cover, and the seal member is disposed between the holding plate and the cover,
The seal member includes an upper seal portion having a lip portion that comes into contact with an upper surface of a guide rail that constitutes the linear motion guide device, and each side seal portion having a lip portion that comes into contact with each side surface of the guide rail,
The upper seal part and the side seal part have a base part held by the holding plate,
The holding plate is composed of an upper plate portion and both side plate portions facing each other with a gap between the upper surface and both side surfaces of the guide rail,
The cover is composed of an upper portion and both side portions facing the upper surface and both side surfaces of the guide rail with a gap therebetween,
The base part of the upper seal part has a holding plate engaging part that engages at a plurality of positions in the vertical direction by fitting unevenness with the upper plate part of the holding plate on one surface in the thickness direction. On the other surface, there is a cover engaging portion that engages at a plurality of positions in the vertical direction by fitting the upper and lower portions of the cover with each other or by contact between the surfaces,
The upper plate portion of the holding plate has a seal holding portion capable of holding the holding plate engaging portion of the base portion at a plurality of positions in the vertical direction,
The upper part of the cover has a seal engaging part that engages at a plurality of positions in the vertical direction by fitting or uneven fitting with a cover engaging part of the base part of the upper seal part or contact between surfaces,
In response to a change in the engagement position of the holding plate engaging portion with respect to the seal holding portion, the engagement position of the cover engaging portion with respect to the seal engaging portion is changed.
The side seal of the linear motion guide device in which the position in the vertical direction of the lip portion is changed by the change in the position of the seal member in the slider moving direction.

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