JP5206472B2 - Linear guide device - Google Patents

Description

  The present invention relates to a linear guide device.

A conventional example of the linear guide device will be described with reference to FIGS.
FIG. 8 is a front view showing the linear guide device with the right half of the end cap removed. FIG. 9 is a plan view of the linear guide partially shown in cross section so that the inside of the circulation path can be seen. FIG. 10 is a perspective view showing an end cap and a return guide.
As shown in these drawings, the linear guide device includes a guide rail 1, a slider (also referred to as “bearing”) 2, and a plurality of balls (rolling elements) 3.

  In the guide rail 1, two rolling grooves (rolling surfaces) 11 extending in parallel with the longitudinal direction are formed on both side surfaces. The slider 2 includes leg portions 2A disposed on both sides in the width direction of the guide rail 1, and a body portion 2B that couples both leg portions 2A. The trunk | drum 2B is arrange | positioned at the thickness direction (direction perpendicular | vertical to both the length direction and the width direction) one end side of the guide rail 1. As shown in FIG. Then, both inner side surfaces of the slider 2 are disposed opposite to both side surfaces of the guide rail 1.

The slider 2 is divided into a main body 21 and an end cap 22 in the linear movement direction, and the end caps 22 are disposed at both ends of the main body 21 in the linear movement direction. Roller grooves (rolling surfaces) 21 a facing the respective rolling grooves 11 of the guide rail 1 are formed on both inner side surfaces of the main body 21. These rolling grooves 11 and 21a form the rolling passage 12 of the ball 3.
Two straight return passages 21b are formed outside the respective rolling grooves 21a of the main body 21 of the slider 2 with an interval in the vertical direction. A female screw 21c is formed between the two return passages 21b. Also, female threads 21 d are formed on both sides of a joint (oil supply or greasing part) N of the body 2 </ b> B of the main body 21. This joint N is a joint for attaching a lubricant supply pipe to the slider 2.

As shown in FIG. 10, the end cap 22 has a pair of first portions 22 </ b> A that form ends of the slider 2 in the linear movement direction of the leg portions 2 </ b> A and a linear movement end of the body 2 </ b> B of the slider 2. It consists of two parts 22B.
On the main body side surface of the first portion 22A of the end cap 22, two semicircular arc-shaped concave portions 22a forming the outer periphery of the direction changing path and a groove (return guide groove) 22b for attaching the return guide 4 are formed. . The first portion 22A is further provided with a through hole 22c into which the shaft portion of the bolt B1 is inserted at a position corresponding to the female screw 21c of the main body 21, and the two concave portions 22a are arranged above and below the through hole 22b. Has been.

The return guide 4 is formed in a semi-cylindrical shape, and its arcuate convex surface 4a is fitted into the return guide groove 22b of the end cap 22, so that the recess 22a of the end cap 22 and the arcuate convex surface of the return guide 4 are provided. The direction change path 24 is formed by 4a. The return guide 4 is provided with two oil passage holes 41 corresponding to the two upper and lower recesses 22a.
At the center in the width direction of the second portion 22B of the end cap 22, a hole (joint attachment hole) 22d for attaching the joint N is formed. Further, through holes 22e into which the shaft portion of the bolt B2 is inserted are provided on both sides of the joint mounting hole 22d and at positions corresponding to the female screw 21d of the main body 21. On the surface of the end cap 22 on the main body side, a groove 22f that extends from the joint mounting hole 22d to the left and right (outside in the width direction), passes through the periphery of the through hole 22e, and then bends at a right angle to reach the recess 22a. Is formed. A recess 22g for attaching an under seal is also formed.

Then, by fitting the return guide 4 into the return guide groove 22b of the end cap 22, the recess 4b of the return guide 4 and the groove 22f of the end cap 22 are connected to complete the oil groove.
In this state, by attaching the end cap 22 to the main body 21 with the bolts B1 and B2, a joint mounting hole 22d is formed between the oil groove formed by the groove 22f and the concave portion 4b of the end cap 22 and the surface of the main body 21 on the end cap 22 side. An oil passage is formed toward the recess 22a. Thereby, the lubricant supplied from the lubricant supply pipe connected to the joint N passes from the joint mounting hole 22d to the direction change path 24 from the oil passage hole 41 through the groove 22f and the recess 4b constituting the oil groove. The ball 3 is lubricated by the direction change path 24.

In addition, the rolling passage 12 and the return passage 21b are communicated with each other through the direction change path 24, and a circulation path 25 that circulates the ball 3 infinitely through each of these paths is configured. Then, as the ball 3 rolls along each circulation path 25, the slider 2 slides along the guide rail 1.
In such a linear guide device, it is necessary to prevent the lubricant from leaking from the contact surface between the main body of the slider and the end cap. Since the slider body is usually made of metal and the end cap is made of synthetic resin, a large slider often has a gap between the contact surfaces.

  Therefore, in Patent Document 1 below, an oil-resistant paste-like sealant 6 is applied around the groove 22f of the end cap 22 and the recess 4b of the return guide 4 constituting the oil groove, as shown by hatching in FIG. And curing.

JP 2004-225758 A

In the method described in Patent Document 1, with the end cap attached to the main body, a gap is generated in a portion where the sealant cured product of the end cap does not exist, and the circulation path of the rolling element becomes longer than the design value. There is a possibility that foreign matter may enter through the gap.
An object of the present invention is to provide a main body, an end cap, and a return in a linear guide device in which an oil groove for introducing a lubricant into a direction change path is formed on a surface of a slider main body of an end cap and a return guide constituting the slider. It is to prevent a gap from being formed between the guide.

  In order to solve the above problems, the linear guide device of the present invention is composed of a guide rail, a slider, and a plurality of rolling elements, and rolling surfaces of the rolling elements are formed on both side surfaces of the guide rail in the width direction. The slider includes leg portions disposed on both sides of the guide rail in the width direction and a body portion disposed on one end side in the thickness direction of the guide rail and connecting the both leg portions. A rolling surface of the rolling element is formed by the rolling surface and the rolling surface of the guide rail, and a return path of the rolling element is formed at the both legs. The leg portions are also formed with a direction changing path for communicating the return path and the rolling path, and a rolling element is disposed in the circulation path constituted by the rolling path, the return path, and the direction changing path. By rolling, one of the guide rail and slider is the other In the linear guide device that linearly moves relative to the slider, the slider has a main body that is divided in the linear movement direction, an end cap, and a return guide that forms the inner periphery of the direction change path. Disposed at both ends of the linear motion direction, a recess that forms the outer periphery of the direction change path is formed on the surface on the main body side, and an oil groove for introducing lubricant into the direction change path is formed on the main body side surface of the end cap and return guide A recess formed along the oil groove is formed outside the oil groove, and a sheet made of an elastic material (for example, synthetic rubber or thermoplastic elastomer) thicker than the depth of the recess is disposed in the recess, and the sheet is elastic The main body, the end cap, and the return guide are in close contact with each other by deformation.

According to the linear guide device of the present invention, since the main body, the end cap, and the return guide are in close contact with each other by the sheet, no gap is generated between the main body, the end cap, and the return guide.
When the linear guide device of the present invention is used by arranging both the leg portions of the slider in the vertical direction, a protrusion is formed on the sheet, and the oil groove formed on one side in the width direction of the body portion by the protrusion. It is preferable to use one that is closed. According to this, by using the oil groove closed by the protrusion on the lower side, the lubricant supplied from the oil supply port arranged at the center of the trunk portion is used as the upper direction change path. Will come around.

According to the present invention, in the linear guide device in which the oil groove for introducing the lubricant into the direction change path is formed on the surface of the end cap and the return guide constituting the slider on the slider main body side, the main body, the end cap, and the return It is possible to prevent a gap from being formed between the guide.
As a result, the lubricant is prevented from leaking from between the slider body, the end cap, and the return guide, and the circulation path of the rolling element is formed as designed, and foreign matter is prevented from entering from the gap. .

It is a figure explaining 1st Embodiment of this invention, Comprising: It is a front view which shows the surface by the side of the main body of an end cap in the state in which the return guide and the sheet | seat were attached. It is AA sectional drawing of FIG. It is a figure explaining the structural member used by 1st Embodiment, (a) is a front view which shows the state in which one return guide was attached to the end cap, (b) is a side view which shows a return guide, c) is a plan view showing a sheet. It is a side view which shows the slider of the linear guide apparatus of 1st Embodiment. It is a figure explaining 2nd Embodiment of this invention, Comprising: It is a front view which shows the surface by the side of the main body of an end cap in the state in which the return guide and the sheet | seat were attached. It is AA sectional drawing of FIG. It is the top view (a) and side view (b) explaining the sheet | seat used by 2nd Embodiment. It is a front view which shows the linear guide apparatus of the state which removed the right side half of the end cap. It is a top view of the linear guide partially shown with the cross section so that the inside of a circulation path can be understood. It is a perspective view which shows an end cap and a return guide. It is a figure explaining a prior art example, Comprising: The front view which shows the surface at the side of the main body of an end cap in the state where the return guide was attached and the oil-resistant paste-form sealant was apply | coated and hardened, and the side surface of an end cap FIG.

Embodiments of the present invention will be described below.
The linear guide device of the present invention is composed of a guide rail 1, a slider 2, and a plurality of balls 3, similarly to the linear guide device shown in FIGS. The slider 2 is divided into a main body 21 and an end cap 22 in the linear motion direction, and a return guide 4 is provided. The linear guide device of the present invention is characterized by the end cap 22 and the return guide 4, and other parts can be made the same as the conventional structure.

In the first embodiment shown in FIG. 1, the linear guide device is arranged with the body 2B of the slider on the lower side and the leg 2A on the upper side, so the second portion 22B of the end cap 22 is on the lower side. One portion 22A is on the upper side.
In the first embodiment, as a difference from the end cap 22 of FIG. 10, an oil sump 22h is provided at a position where a groove 22f extending from the joint mounting hole 22d to the left and right is bent at a right angle on the surface of the end cap 22 on the main body side. . Further, as shown in FIG. 3 (a), a recess continuously extending along the oil groove around the groove 22f, around the joint mounting hole 22d continuous with the groove 22f, and around the oil reservoir 22h continuous therewith. 22i is formed.

Further, a recess 22j slightly narrower than the return guide groove 22b is formed between the return guide groove 22b and the recess 22g for attaching the under seal. Further, a short tube 23 having an inner peripheral surface continuous to the through hole 22c protrudes from the surface on the main body side.
As shown in FIG. 3B, a recess 42 is also formed on the main body side surface of the return guide 4 (an end surface extending in the axial direction of the semi-cylindrical body). The recess 42 is formed outside the recess (oil groove) 4b of the return guide 4 along the recess (oil groove) 4b. The depth of the recess 42 is the same as that of the recess 22i and the recess 22j.

With the return guide 4 attached, the planar sheet 5 shown in FIG. 3C is disposed in the recess 22i and the recess 22j of the end cap 22 and the recess 42 of the return guide 4, so that the state shown in FIG. Become.
The sheet 5 includes a planar first portion 51 corresponding to the recess 22i, a planar second portion 52 corresponding to the recess 42, and a planar third portion 53 corresponding to the recess 22j. . The sheet 5 is made of synthetic rubber or thermoplastic elastomer, and the thickness of the sheet 5 is slightly thicker than the depth of the recesses 22i, 22j, and 42.

  A slider 2 shown in FIG. 4 is formed by fixing the end cap 22 in the state of FIG. 1 to the main body 21 with bolts. In this state, the main body 21, the end cap 22, and the return guide 4 are in close contact with each other by the seat 5, so that no gap is generated between the main body 21, the end cap 22, and the return guide 4. Therefore, the lubricant is prevented from leaking from between the main body 21, the end cap 22 and the return guide 4, and the circulation path of the rolling elements is formed as designed, and foreign matter is prevented from entering through the gap. The

In the second embodiment shown in FIG. 5, since the linear guide device is arranged with the legs 2A of the slider directed in the vertical direction, one of the first portions 22A of the end cap 22 is on the upper side and the other is on the lower side.
In this embodiment, since the grease is supplied from the joint mounting hole 22d disposed in the central portion of the trunk portion 22B, the seat 50 shown in FIG. 7 is used. In this sheet 50, a part of the space sandwiched between the first portions 51 of the sheet 5 shown in FIG. 3 (c) (a portion between the joint mounting hole 22d and one through hole 22e) is closed. The projection 54 protrudes from the sheet surface. Projecting thickness of the projection 54 is equal to the depth from the bottom surface of the recess 22i of the grooves 22f. The sheet 50 may be integrally formed of the same material as that of the sheet 5 shown in FIG. 3C, or the sheet 5 may have a protrusion 54 of the same material bonded thereto.

After the return guide 4 shown in FIG. 3B is attached to the end cap 22 shown in FIG. 3A, the seat 50 shown in FIG. 7 is attached to bring the end cap 22 in this state into the state shown in FIG. The main body 21 is fixed with bolts.
Accordingly, the main body 21, the end cap 22, and the return guide 4 are in close contact with each other in the first portion 51 to the third portion 53 of the seat 50, so that there is a gap between the main body 21, the end cap 22, and the return guide 4. Does not occur. Therefore, the lubricant is prevented from leaking from between the main body 21, the end cap 22 and the return guide 4, and the circulation path of the rolling elements is formed as designed, and foreign matter is prevented from entering through the gap. The

  Further, since a part of the groove 22f (a portion between the joint mounting hole 22d and the lower through hole 22e) is blocked by the protrusion 54 of the sheet 50, the sheet 50 is supplied from the lubricant supply pipe connected to the joint N. The lubricant reaches the upper direction change path 22a from the joint mounting hole 22d.

1 Guide rail 11 Rolling groove (Rolling surface)
12 Rolling Path 2 Slider 2A Leg 2B Horizontal 21 Main Body 21a Rolling Groove (Rolling Surface)
21b Return passage 21c Female screw 21d Female screw 22 End cap 22A First part of end cap 22B Second part of end cap 22a Semi-circular recess (outer periphery of direction change path)
22b Return guide groove 22c Through hole 22d Joint mounting hole 22e Through hole 22f Groove (oil groove)
22g Concave part for attaching under seal 22h Oil reservoir 22i Concave part along oil path 22j Concave part 23 Short pipe 24 Direction change path 3 Ball (rolling element)
4 Return guide 4a Arc-shaped convex surface of return guide (inner circumference of direction change path)
4b Concave part (oil groove)
42 Concave portion along oil passage 5 Sheet 50 Sheet 51 First portion (planar portion corresponding to concave portion 22i)
52 2nd part (plane-shaped part corresponding to the recess 42)
53 3rd part (plane-shaped part corresponding to the recess 22j)
54 Protrusion 6 Sealant N Joint (Oil supply or greasing part)
B1 bolt B2 bolt

Claims (3)

Consists of a guide rail, a slider, and a plurality of rolling elements,
Rolling surfaces of the rolling elements are formed on both sides in the width direction of the guide rail,
The slider is composed of leg portions disposed on both sides in the width direction of the guide rail and a body portion that is disposed on one end side in the thickness direction of the guide rail and connects the both leg portions.
The inner surface of the both legs has a rolling surface disposed opposite to the rolling surface of the guide rail, and the rolling surface of the rolling element is formed by the rolling surface and the rolling surface of the guide rail, Both legs are formed with return passages for rolling elements, and both legs are also formed with direction changing paths for communicating the return passages with the rolling passages.
In the linear guide device in which one of the guide rail and the slider moves linearly relative to the other by rolling the rolling element in a circulation path constituted by the rolling path, the return path, and the direction changing path. ,
The slider has a main body that is divided in the linear motion direction, an end cap, and a return guide that forms the inner periphery of the direction change path,
The end caps are disposed at both ends of the main body in the linear movement direction, and concave portions forming the outer periphery of the direction changing path are formed on the main body side surface.
An oil groove for introducing a lubricant into the direction changing path is formed on the body surface of the end cap and the return guide,
A recess along the oil groove is formed outside the oil groove, and a sheet made of an elastic material thicker than the depth of the recess is disposed in the recess, and the sheet is elastically deformed so that the main body, the end cap, and the return guide are It is in close contact,
A linear guide device, wherein a protrusion is formed on the sheet, and an oil groove formed on one side in the width direction of the body portion is closed by the protrusion. The linear guide device according to claim 1 , wherein a protrusion thickness of the protrusion is equal to a depth of the oil groove from a bottom surface of the recess . The linear guide device according to claim 1, wherein the sheet and the protrusion are made of the same material, and the protrusion is bonded to the sheet.

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