JP2016183742A - Side seal of linear motion guide device, linear motion guide device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a side seal of a linear motion guide device capable of using without replacing a seal member whether a rail cover is disposed over a top face of a guide rail or not when the seal member and a holding member are separately formed.SOLUTION: A seal member 1 comprises: an upper seal part 11 having a lip part 11a coming into contact with a top face 101 of a guide rail; and each lateral seal part having lip part coming into contact with each flank of the guide rail. The upper seal part 11 and the lateral seal parts are separately formed and the upper seal part 11 is connected to the lateral seal parts movably in a vertical direction. The upper seal part 11 includes a salient 11b protruding on the side of a holding member 2. The holding member 2 includes grooves, to which the salient 11b is fitted, on a surface on the side on which the upper seal part 11 of a finish plate part 2a is disposed at a plurality of vertical positions. The position of the lip part 11a in a vertical direction is changed depending on positions of grooves 22 and 23 to which the salient 11b is fitted.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a side seal in which a seal member and a member for holding the seal member are separately formed and used by being fixed to an end portion in a moving direction of a slider constituting a linear motion guide device.

A conventional example of a linear motion guide device is shown in FIG. 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 also been proposed that the side seal is constituted by a separately formed seal member, a holding member that holds the seal member, and a cover (scraper).

  In Patent Document 1, a side seal holding member (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 member. It is described that a scraper portion is provided to be opposed to the outer surface with a gap. The holding member and the seal portion are engaged with each other with a concave and 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 seal member, a holding plate (holding member), and a cover, for the purpose of preventing a drop in the dust resistance and wear resistance of the seal member and dropping from the holding plate, It describes that the holding plate is provided with an alignment portion of the seal member 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. Further, in the case of a side seal in which a seal member and a holding member that holds the seal member are separately formed, it is necessary to prepare two types of seal members.
The subject of this invention is the case where the rail cover is arranged on the upper surface of the guide rail and the case where the rail cover is not arranged as a side seal in which the seal member and the holding member for holding it are formed separately. An object of the present invention is to provide a seal member that can be used without replacement.

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 (4).
(1) It has a seal member and a holding member for holding the seal member. The seal member and the holding member are formed separately and are used by being fixed to the moving direction end of the slider constituting the linear motion guide device.

(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 are formed separately, and the upper seal is coupled to the side seal part so as to be movable in the vertical direction. Each of the upper seal portion and the side seal portion has a held portion held by the holding member on the opposite side of the lip portion. The held portion of the upper seal portion is a convex portion that protrudes toward the holding member.

(3) The holding member includes an upper plate portion and both side plate portions that face the upper surface and both side surfaces of the guide rail with a gap therebetween. Grooves into which the convex portions are fitted are provided at a plurality of positions in the upper and lower positions on the surface of the upper plate portion on the side where the upper seal portion is disposed. A holding portion for holding the held portion is provided on a side of the side plate portion where the side seal portion is disposed.
(4) The position of the seal member in the vertical direction of the lip portion varies depending on the position of the groove into which the convex portion is fitted.
The side seal of this aspect uses only one seal member, and changes the position of the groove for fitting the convex portion of the seal member to change the position of the lip portion in the vertical direction. Can be used.

  The side seal of the present invention is a side seal of a linear motion guide device, in which a seal member and a holding member that holds the seal member are separately formed, but a 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 sectional drawing which shows the upper part part of the guide rail of the state which attached the side seal of embodiment to the linear guide apparatus, Comprising: The state (a) with which a rail cover is not arrange | positioned at a guide rail, and a rail cover are arrange | positioned State (b) 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. It is a front view of the sealing member which comprises the side seal of embodiment, Comprising: AA cross section respond | corresponds to FIG. 1, and BB cross section respond | corresponds to FIG. It is a top view which shows the coupling | bond part of the upper side seal part and side seal part of the seal member of FIG. It is a figure which shows the holding member which comprises the side seal of embodiment, Comprising: (a) is a front view of a holding member, AA cross section corresponds to FIG. 1, BB cross section corresponds to FIG. (B) is the elements on larger scale of a holding member. It is a figure explaining the example from which the shape of the upper and lower groove | channel formed in the holding member differs. 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. 7, and as shown in FIGS. 1 and 2, the seal member 1, the holding member 2, Consists of. The seal member 1 is held on the surface of the holding member 2 disposed on the slider 200 side.

The seal member 1 is arranged as viewed from the front as shown in FIG. 3, and is divided into an upper seal portion 11 disposed on the upper side of the guide rail 100 and a side seal portion 12 disposed on the left and right sides of the guide rail 100. It is done. The upper seal part 11 and the side seal part 12 are formed separately.
The upper seal portion 11 has a lip portion 11 a that is brought into contact with the upper surface 101 of the guide rail 100. The side seal portion 12 has a lip portion 12 a that is in contact with the left and right side surfaces 102 of the guide rail 100. The upper seal portion 11 and the side seal portion 12 have convex portions 11b and 12b protruding toward the holding member 2 as held portions held by the holding member 2 on the opposite sides of the lip portions 11a and 12a, respectively. Portions between the lip portions 11a and 12a and the convex portions 11b and 12b are defined as intermediate portions 11c and 12c.

As shown in FIG. 4, the boundary surface 13 between the upper seal portion 11 and the side seal portion 12 is joined by an uneven fit, and the upper seal portion 11 can move vertically with respect to the side seal portion 12. It has become. In this example, a concave portion 11 d is formed on the end surface forming the boundary surface 13 of the upper seal portion 11, and a convex portion 12 d is formed on the end surface forming the boundary surface 13 of the side seal portion 12.
As shown in FIGS. 1, 2, and 5, the holding member 2 has substantially the same surface shape as the end cap 202 constituting the slider 200, and an upper plate portion 2 a disposed on the upper side of the guide rail 100, It comprises side plate portions 2b arranged on the left and right sides of the guide rail 100. A through hole 52 through which the bolt 500 (FIG. 7) is passed and a through hole 42 to which the grease nipple 400 (FIG. 7) 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 member 2 (guide rail side), a seal holding portion 20 that holds the convex portions 11b and 12b of the seal member 1 is formed.

As shown in FIGS. 1, 2, and 5, the seal holding portion 20 is fitted with a concave portion 21 in which the intermediate portions 11 c and 12 c of the seal member 1 are disposed and a convex portion 11 b of the upper seal portion 11 of the seal member 1. The first groove 22 includes a second groove 23 into which the convex portion 11 b of the upper seal portion 11 is fitted, and a third groove 24 into which the convex portion 12 b of the side seal portion 12 is fitted.
That is, the seal holding part 20 has grooves in which the convex part 11b of the upper seal 11 is fitted on the surface of the upper plate part 2a on the side where the upper seal 11 is arranged (first and second). Grooves 22, 23) and a third groove (holding portion) 24 into which the convex portion 12 b of the side seal portion 12 is fitted on the surface of the side plate portion 2 b on the side where the side seal portion 12 is disposed. The third groove 24 formed in the side plate portion 2b is continuous with the first groove 22 formed in the upper plate portion 2a.

  The seal member 1 is made of rubber or a thermoplastic elastomer. Examples of the rubber to be used include nitrile rubber, hydrogenated nitrile rubber, acrylic rubber, silicone rubber, and fluorine rubber. Examples of the thermoplastic elastomer include polyester elastomers and urethane elastomers. The holding member 2 is made of a synthetic resin such as POM (polyoxymethylene) or 6,6 nylon.

As shown in FIGS. 1 and 2, the side seal 4 of this embodiment is used by being attached to a slider 200 of a linear motion guide device.
When the linear guide device is used without arranging the rail cover 5 on the upper surface 101 of the guide rail 100, the seal member 1 is held in the state shown in FIG. 3 as shown in FIG. 1 (a) and FIG. The side seal 4 is assembled by being held by the member 2 and fixed to the slider 200.

  Specifically, first, the intermediate portion 11c of the seal member 1 is disposed in the concave portion 21 of the holding member 2, and the convex portion 11b of the upper seal portion 11 is fitted into the first groove 22 of the upper plate portion 2a of the holding member 2. The side seal 4 is assembled by fitting the convex portion 12 b of the side seal portion 12 into the third groove 24 of the side plate portion 2 b of the holding member 2. Next, the side seal 4 is disposed outside the end cap 202 disposed at the end of the slider 200 in the moving direction, and the slider main body 201 is inserted through the end cap 202 with a bolt inserted through the through hole 52 of the holding member 2. Secure to.

Thereby, as shown in FIG. 1A, the lip portion 11 a of the upper seal portion 11 comes into contact with the upper surface 101 of the guide rail 100. Moreover, the lip | rip part 12a of the side seal part 12 contacts the side surface 102 and the rolling surface 110 of the guide rail 100, as shown in FIG.
When the rail cover 5 is arranged on the upper surface 101 of the guide rail 100 and the linear guide device is used, first, the seal member 1 is moved from the state shown in FIG. 3 to the recess 11d of the upper seal portion 11 and the side seal. The boundary surface 13 fitted with the convex portion 12d of the portion 12 is shifted, and the upper seal portion 11 is moved upward by the thickness of the rail cover 5 with respect to the side seal portion 12.

Next, in this state, the intermediate portion 11c of the seal member 1 is disposed in the concave portion 21 of the holding member 2, and the convex portion 11b of the upper seal portion 11 is fitted into the second groove 23 of the upper plate portion 2a of the holding member 2. The side seal 4 is assembled by fitting the convex portion 12 b of the side seal portion 12 into the third groove 24 of the side plate portion 2 b of the holding member 2.
Next, the side seal 4 is disposed outside the end cap 202 disposed at the end of the slider 200 in the moving direction, and the slider main body 201 is inserted through the end cap 202 with a bolt inserted through the through hole 52 of the holding member 2. Secure to.

Thereby, as shown in FIG.1 (b), the lip | rip part 11a of the upper side seal part 11 contacts on the rail cover 5. FIG. Moreover, the lip | rip part 12a of the side seal part 12 contacts the side surface 102 and the rolling surface 110 of the guide rail 100 as shown in FIG. 2 similarly to the case where the rail cover 5 is not arrange | positioned.
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.

In the above-described embodiment, the held portion of the side seal portion 12 is the convex portion 12b that is continuous with the convex portion 11b of the upper seal portion 11, but is not in a position that is not continuous with the convex portion 11b of the upper seal portion 11. A holding portion corresponding to this may be provided in the holding member.
Moreover, in the above-mentioned embodiment, although the 1st groove | channel 22 and the 2nd groove | channel 23 of the holding member 2 are formed with the same dimension, the 1st groove | channel 22 and the 2nd of the upper board part 2a of the holding member 2 are formed. The grooves 23 may be formed with different dimensions. An example is shown in FIG. In the holding member 2A of FIG. 6, the vertical dimension of the upper second groove 23 is made larger than the thickness of the convex part 11b of the upper seal part 11 of the seal member 1, and the dimension in the depth direction is set to the protruding length of the convex part 11b. It is bigger than that. The 2nd groove | channel 23 is made into the dimension which the convex part 11b of the upper side seal part 11 fits exactly.

  Specifically, in the holding member 2A of FIG. 6, the upper surface 23a of the second groove 23 is at the same position as in FIG. 1, and the lower surface 23b is slightly lowered from the case of FIG. Therefore, when used in the linear motion guide device in which the rail cover is disposed on the upper surface of the guide rail, as shown in FIG. 6A, the convex portion 11b of the upper seal portion 11 has the second groove 23. The upper surface 23a is contacted, and a gap is formed between the convex portion 11b and the lower surface 23b. Further, when used in a linear motion guide device in which no rail cover is arranged on the upper surface of the guide rail, as shown in FIG. 6B, the convex portion 11 b of the upper seal portion 11 is formed in the first groove 22. It will be in a state fitted in.

In machine tools, etc., a linear motion guide device is used by connecting a guide rail with a rail cover on the top and a guide rail without a rail cover, and reciprocating the slider over these guide rails. There is a case. In this case, when the holding member 2A shown in FIG. 6 is used, it can be expected to operate as shown below.
When the lip portion of the upper seal portion 11 moves from the rail cover to the guide rail, the upper seal portion 11 is pulled downward by the frictional force of the lip portion against the rail cover, and the convex portion 11b of the upper seal portion 11 is elastically deformed. The second groove 23 comes off and enters the first groove 22. Further, when the lip portion of the upper seal portion 11 moves from the guide rail to the rail cover, the upper seal portion 11 is pushed upward by the frictional force of the lip portion 11a against the rail cover, and the convex portion 11b of the upper seal portion 11 is elastic. Due to the deformation, it is detached from the first groove 22 and enters the second groove 23.

DESCRIPTION OF SYMBOLS 1 Seal member 11 Upper seal part 11a Lip part made to contact the upper surface of a guide rail 11b Convex part (held part) of an upper seal part
11c Middle part of the upper seal part 11d Concave part formed on the boundary surface with the side seal part of the upper seal part 12 Side seal part 12a Lip part brought into contact with the side surface of the guide rail 12b Protrusion part of the side seal part (covered) Holding part)
12c Intermediate portion of the side seal portion 12d Convex portion formed on the boundary surface with the upper seal portion of the side seal portion 13 Boundary surface of the seal member 2 Holding member 2a Upper portion of the holding member 2b Side portion of the holding member 20 Seal holding portion 20A Seal holding portion 21 Recessed portion in which intermediate portion is arranged 22 First groove 23 Second groove 23a Upper surface of second groove 23b Upper surface of second groove 24 Third groove (holding of side portion) Part)
4 Side seal 5 Rail cover 42 Through hole for attaching a grease nipple 52 Through hole for passing a bolt 100 Guide rail 101 Upper surface of the guide rail 110 Rolling surface of the guide rail 200 Slider 201 Slider body 202 End cap 203 Side seal 205 Female screw 210 Slider Rolling surface 221 Return path 222 Direction change path 300 Roller (rolling element)
400 Grease nipple 500 bolt

Claims (2)

A seal member and a holding member for holding the seal member, the seal member and the holding member are formed separately, and are used by being fixed to the moving direction end of the slider constituting the linear motion guide device,
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 are formed separately, and the upper seal part is coupled to the side seal part so as to be movable in the vertical direction,
The upper seal part and the side seal part each have a held part held by the holding member on the opposite side of the lip part, and the held part of the upper seal part is on the holding member side Is a convex part protruding to
The holding member includes an upper plate portion and both side plate portions facing the upper surface and both side surfaces of the guide rail with a gap, and the convex portion is formed on a surface of the upper plate portion on the side where the upper seal portion is disposed. A holding part for holding the held part on the side where the side seal part of the side plate part is disposed;
The seal member is a side seal of a linear motion guide device in which a position in the vertical direction of the lip portion changes depending on a position of the groove in which the convex portion is fitted.   A linear guide device in which the side seal according to claim 1 is fixed to an end portion in a moving direction of the slider.

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