JP6930406B2 - Linear guidance device and mechanical device - Google Patents

Description

The present invention relates to a linear motion guide device and a mechanical device.

Contact seals that protect the slider, such as side seals, inner seals, under seals, and bottom seals, are used for the linear motion guide device, and there are many proposals for the lip shape. For example, in the shapes shown in Patent Document 1 and Patent Document 2, a plurality of lips are formed on the contact surface of one seal. It is generally known that when a foreign substance invades from the outside, it is better to prevent it with a plurality of lips than to prevent it with one lip, and it is often used by stacking a plurality of seals. In Patent Document 1 and Patent Document 2, even one seal has a plurality of lips, and the same effect as stacking a plurality of seals is expected. Further, in Patent Document 3, by arranging the lips symmetrically with respect to the core metal, a constant sealing property is ensured regardless of the sliding direction.

Japanese Unexamined Patent Publication No. 2010-84811 Japanese Unexamined Patent Publication No. 11-287245 JP-A-2002-266858 Japanese Unexamined Patent Publication No. 2014-163482

However, with these seal shapes, the seal property tends to be improved, while the seal frictional force tends to be large. When n lips having the same shape are brought into contact with each other as in Patent Document 1 and Patent Document 3, the sealing friction becomes n times. As in Patent Document 2, even if each lip shape is changed, the seal frictional force basically increases. In addition, since each lip is arranged side by side, the width dimension of the entire lip is larger than that of a standard single lip.
Therefore, although the seals shown in Patent Document 1, Patent Document 2, and Patent Document 3 have improved sealing properties, they have a large seal friction and a large lip width dimension, which may cause a problem depending on the usage conditions. ..
In the seal shown in Patent Document 4, the outermost lip and the inner lip do not come into contact with the mating part at the same time, and when only the outermost part comes into contact, the seal frictional force is small. However, if the squeeze margin is increased and a plurality of lips are brought into contact with each other, the sealing friction becomes large and the plurality of lips come into contact with each other, so that the effect of the multiple lips as in Patent Document 1 and Patent Document 3 can be obtained. I can't hope. Further, since it is a laminated seal, the width dimension of the entire seal becomes large, and it may be difficult to apply the seal depending on the application position of the seal.

The present invention has been made in view of the above circumstances, and an object of the present invention is a linear motion guide device capable of properly using a contact state according to an application and improving the sealing property with a width dimension equivalent to that of a single lip seal. And to provide machinery.

The present invention has the following configuration.
(1) A guide rail extending in the longitudinal direction, a slider moving along the guide rail, and a sealing member for closing a gap between the guide rail and the slider are provided.
The seal member includes a seal member main body extending in the longitudinal direction and a lip piece extending from the seal member main body toward the guide rail and contacting the guide rail with a main lip at the tip in the extending direction. Have and
A linear motion guide device in which an auxiliary lip projecting outward is formed on the surface of the lip piece from the main lip to the connecting portion connected to the seal member main body on the surface on the side in contact with the guide rail.
According to this linear motion guide device, since the seal member has an auxiliary lip in addition to the main lip, it is possible to easily adjust the contact state with the guide rail and the non-contact according to the deformation of the lip piece. .. If the seal member has a small margin with the guide rail, only the main lip comes into contact with the guide rail. When the squeeze margin is increased, the auxiliary lip in addition to the main lip also comes into contact with the guide rail. In that case, the seal can obtain the same high sealing property as the multiple lip. Therefore, in the sealing member for high dustproof use, the margin of the lip piece is set large, and the main lip and the auxiliary lip are brought into contact with the guide rail together. On the other hand, in the sealing member for low friction use, the tightness of the lip piece is set to be small so that a single lip contact is made. By adjusting the sealing margin in this way, it is possible to use the contact state properly according to the application, and it is possible to improve the sealing property with the same width dimension as the single lip seal.

(2) The sealing member can selectively set a state in which only the main lip contacts the guide rail and a state in which both the main lip and the auxiliary lip contact the guide rail (1). The linear motion guide device described in.
According to this linear motion guide device, a single lip state and a double lip state can be selectively set even though it is a single sealing member, and the sealing property and the sliding resistance have an appropriate relationship according to the purpose of use. Can be adjusted to.

(3) The linear motion guide device according to (1) or (2), wherein the auxiliary lip has an arcuate cross-sectional shape orthogonal to the longitudinal direction.
According to this linear motion guide device, the contact point of the auxiliary lip with the guide rail changes depending on the deformed state of the lip piece, but a constant contact state can be ensured because the cross-sectional shape is formed in an arc shape. ..

(4) The linear motion guide device according to (3), wherein the arc radius of the auxiliary lip is 1 to 5 times the protruding height of the auxiliary lip from the surface of the lip piece.
According to this linear motion guide device, the cross-sectional area of the auxiliary lip can be remarkably reduced by setting the arc radius of the auxiliary lip to 5 times or less the protruding height of the auxiliary lip. On the other hand, if the arc radius of the auxiliary lip is less than the same as the protruding height, a constriction is generated at the joint with the lip piece, and the strength of the auxiliary lip is reduced. Therefore, if the arc radius is set within the above range, it is possible to prevent a decrease in the strength of the auxiliary lip while suppressing friction.

(5) The seal member main body is a plate-shaped member, and the lip piece extends from one end of the seal member main body in the plate thickness direction.
The linear motion guide device according to any one of (1) to (4), wherein the width of the lip piece in the plate thickness direction is smaller than the plate thickness of the seal member main body.
According to this linear motion guide device, the width of the lip piece in the plate thickness direction is made smaller than the plate thickness of the seal member main body, so that the same dimensions as the standard single lip seal can be secured.

(6) A concave groove along the longitudinal direction is formed on the bottom surface of the slider, and the guide rail is housed in the concave groove.
The linear motion guide device according to any one of (1) to (5), wherein the seal member is a bottom seal fixed to the bottom surface of the slider and extended toward the side surface of the guide rail.
According to this linear motion guide device, the gap between the bottom surface of the slider and the side surface of the guide rail can be closed by a seal member provided as a bottom surface seal.

(7) A concave groove along the longitudinal direction is formed on the bottom surface of the slider, and the guide rail is housed in the concave groove.
A rolling element raceway surface on which a rolling element is rotatably arranged is provided on a side surface of the guide rail and an inner side surface of the concave groove of the slider facing the side surface.
The seal member is an underseal arranged on the opening side of the concave groove with respect to the rolling element raceway surface, or an inner seal arranged on the side opposite to the opening side of the concave groove (1) to (5). The linear motion guide device according to any one of the above.
According to this linear motion guide device, the gap between the rolling element raceway surface on the slider side and the rolling element raceway surface on the guide rail side formed on the opening side of the concave groove can be closed by the underseal. Further, the gap between the rolling element raceway surface on the slider side and the rolling element raceway surface on the guide rail side, which are formed on the side opposite to the opening side of the concave groove, can be closed by the inner seal.

(8) A concave groove along the longitudinal direction is formed on the bottom surface of the slider, and the guide rail is housed in the concave groove.
End caps are arranged at both ends of the slider in the longitudinal direction.
The linear motion guide device according to any one of (1) to (5), wherein the seal member is a side seal fixed to the end cap and extended toward the guide rail.
According to this linear motion guide device, the gap between the outer surface of the guide rail and the inner surface of the end cap can be closed by the side seal provided on the end cap.

(9) A mechanical device including any one of the linear motion guide devices (1) to (8).
According to this mechanical device, it is possible to suppress the entry of foreign matter such as dust, dust, chips, and chips into the gap formed between the guide rail and the slider, and it is possible to smoothly roll the rolling element over a long period of time. Become.

According to the present invention, it is possible to properly use the contact state according to the application, and it is possible to improve the sealing property with a width dimension equivalent to that of a single lip seal.

It is a perspective view of the linear motion guide device which concerns on one Embodiment of this invention. It is a perspective view of the slider of the linear motion guide device shown in FIG. It is schematic cross-sectional view which shows the cross section orthogonal to the longitudinal direction of the guide rail of a guide rail and a slider. It is a partially disassembled perspective view of the slider shown in FIG. It is sectional drawing which shows the attachment state to the slider main body of the bottom seal. It is an enlarged sectional view orthogonal to the longitudinal direction of a bottom seal. (A) is an enlarged view of a main part of the bottom seal when used for low friction applications, and (B) is an enlarged view of a main part of the bottom seal when used for high dustproof applications. It is explanatory drawing which shows the correlation between the arc radius of an auxiliary lip and the protrusion amount. It is a graph which shows the correlation between the radius ratio of the auxiliary lip, and the cross-sectional area ratio. It is a reference figure which shows the auxiliary lip which arc radius is less than 1 times the protrusion amount. It is sectional drawing of the under seal in the direction orthogonal to the longitudinal direction of a guide rail. (A) is a front view of the side seal, and (B) is a cross section taken along line AA of (A). (A) is a plan view in which the table of the transport device including the linear motion guide device is omitted, (B) is a front view of (A) including the table, and (C) is a partially enlarged view of (B).

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view of a linear motion guide device 11 according to an embodiment of the present invention, and FIG. 2 is a perspective view of a slider 15 of the linear motion guide device 11 shown in FIG.

The linear motion guide device 11 according to the present embodiment includes a guide rail 13, a slider 15 that moves with respect to the guide rail 13, a rolling element 17 and a cage 27 (see FIG. 3) described later, a lubrication unit 39, and a guide. It has a sealing member that closes the gap between the rail 13 and the slider 15. The seal member is a general term for the bottom seal 33, the under seal 35, the inner seal 37, and the side seal 41, which will be described later. A pair of guide rail side raceway surfaces (rolling body raceway surfaces) 19 are formed on the side surface portion of the guide rail 13 along the longitudinal direction of the guide rail 13. The slider 15 includes a slider main body 21 and a pair of end caps 23 provided at both ends of the slider main body 21 in the moving direction (longitudinal direction). Further, a lubrication unit 39 is fixed to the slider 15 on the outer side in the longitudinal direction of the end cap 23, and a side seal 41 is fixed on the outer side of the lubrication unit 39 by a screw 43. The lubrication unit 39 is made of a synthetic resin in which lubricating oil is contained in a large number of bubbles, and supplies lubricating oil to the guide rail side raceway surface 19 for a long period of time. The slider body 21, the end cap 23, the lubrication unit 39, and the side seal 41 are all installed so as to form a U-shaped cross section and straddle the guide rail 13. That is, the slider main body 21, the end cap 23, the lubrication unit 39, and the side seal 41 are formed with a concave groove for accommodating the guide rail 13. FIG. 3 shows the concave groove 42A of the slider main body 21, and FIG. 2 shows the concave portion 42B of the end cap 23, the concave portion 42C of the lubrication unit 39, and the concave portion 42D of the side seal.

FIG. 3 is a schematic cross-sectional view showing a cross section orthogonal to the longitudinal direction of the guide rail 13 and the guide rail 13 of the slider main body 21.
As shown in FIG. 3, a pair of slider-side raceway surfaces (rolling body raceway surfaces) 25 are provided on the inner surface of the concave groove 42A of the slider body 21 so as to face the guide rail-side raceway surface 19 (see FIG. 1). It is formed.
A plurality of rolling elements 17 and a cage 27 for holding the rolling elements 17 are provided between the slider-side raceway surface 25 and the guide rail-side raceway surface 19, and each rolling element 17 is rotatably arranged. NS. The rolling element 17 rolls in the track formed between the slider-side raceway surface 25 and the guide rail-side raceway surface 19 as the guide rail 13 and the slider 15 move relative to each other.

The rolling element 17 is, for example, a cylindrical roller, and rolls in the track and moves along the longitudinal direction of the slider main body 21. The rolling element 17 changes direction with an end cap 23 provided at one end in the longitudinal direction of the slider body 21 shown in FIG. 2, and then passes through a rolling element return passage (not shown) formed inward of the slider body 21. After changing the direction again with the end cap 23 provided at the other end of the slider main body 21 in the longitudinal direction, the slider body 21 is returned to the original track.

Here, as described above, the linear motion guide device 11 of the present embodiment is provided with a seal member called a bottom seal 33, an under seal 35, an inner seal 37, and a side seal 41. The bottom surface seal 33 is a seal that seals the gap formed between the guide rail 13 and the slider 15, the lubricating unit 39, and the side seal 41 to prevent foreign matter from entering from the outside and prevent leakage of lubricating oil. The underseal 35 and the inner seal 37 are seals that prevent the lubricating oil from leaking from the track. The side seal 41 is a seal that seals the gap between the guide rail 13 and the end cap 23 to prevent foreign matter from entering from the outside and to prevent leakage of lubricating oil.

The material of the sealing member is preferably a rubber material having oil resistance such as nitrile rubber or fluororubber, or a thermoplastic polyester elastomer or the like. Mild steel can also be used, but since there is concern about wear of the contact portion, it is necessary to make the lip thickness itself as thin as possible so that springiness can be obtained.

FIG. 4 is a partially exploded perspective view of the slider 15 shown in FIG. 2, and FIG. 5 is a cross-sectional view showing a state in which the bottom surface seal 33 is attached to the slider main body 21.
As shown in FIG. 4, the bottom surface seal 33 is formed in a plate shape in which one long side extends toward the side surface of the guide rail 13 (see FIG. 1), and is integrated with the cover 61 on the bottom surface of the slider body 21. It is assembled to. Through holes 34 and 62 are formed in the bottom seal 33 and the cover 61, respectively.

As shown in FIG. 5, a screw 63 is inserted into the through holes 34 and 62 and screwed into the tap hole 22 formed in the slider main body 21. As a result, the bottom surface seal 33 is fastened and fixed to the slider main body 21 by the screw 63.

Here, the dimensional difference between the inner diameters of the through holes 34 and 64 and the outer diameter of the screw 63 is utilized as an adjustment amount of the sealing margin. If the above dimensional difference is insufficient as an adjustment amount for the sealing margin, the through holes 34 and 64 may be elongated holes.

FIG. 6 is an enlarged cross-sectional view orthogonal to the longitudinal direction of the bottom surface seal 33.
The bottom surface seal 33 extends from the seal member main body 55 extending in the longitudinal direction and the seal member main body 55 toward the guide rail 13 (see FIG. 5), and comes into contact with the guide rail 13 by the main lip 59 at the tip in the extending direction. It has a lip piece 53 and a lip piece 53.

The seal member main body 55 is a plate-shaped member, and the lip piece 53 extends from the connecting portion 57 side, which is one end of the seal member main body 55 in the plate thickness direction, toward the other end in the plate thickness direction. The lip piece 53 extends in a direction inclined from the plate thickness direction of the seal member main body 55, and can be rotated around the connecting portion 57 by elastic deformation.

In the lip piece 53, an auxiliary lip 51 is formed on the surface of the lip piece 53 on the side in contact with the guide rail 13 between the main lip 59 and the connecting portion 57 connected to the seal member main body 55. That is, the auxiliary lip 51 is arranged between the main lip 59, which is the contact start point with the contact partner side, and the rotation center (connecting portion 57) of the main lip 59. The auxiliary lip 51 has an arcuate cross-sectional shape orthogonal to the longitudinal direction, and is formed so as to project outward (contact partner side). The main lip 59 is separated from the connecting portion 57 with the seal member main body 55 by a distance L in a no-load state. The distance L is appropriately set according to the material and application of the sealing member.

FIG. 7A is an enlarged view of a main part of the bottom surface seal 33 when used for low friction applications, and FIG. 7B is an enlarged view of a main part of the bottom surface seal 33 when used for high dustproof applications.
The auxiliary lip 51 is arranged between the main lip 59 and the connecting portion 57 which is the center of rotation of the lip piece 53, so that the auxiliary lip 51 can be brought into contact with the contacting partner side according to the deformation of the lip piece 53 due to the above-mentioned squeeze margin. The contact state can be easily adjusted and the non-contact state can be easily adjusted.

That is, the state shown in FIG. 7A is a single lip seal in which only the main lip 59 contacts the guide rail 13 which is the contact partner, and the seal has a low frictional force. On the other hand, the state shown in FIG. 7B is a state of a double lip seal in which both the main lip 59 and the auxiliary lip 51 are in contact with the guide rail 13, and the sealing property is enhanced. In this way, depending on the state in which the bottom surface seal 33 is pressed against the contact partner side, only the main lip 59 is in contact with the guide rail, and both the main lip 59 and the auxiliary lip 51 are in contact with the guide rail. Can be set selectively. That is, the single lip state and the double lip state can be selectively set, and the sealing property and the sliding resistance can be adjusted to an appropriate relationship according to the purpose of use. Since the auxiliary lip 51 of the bottom surface seal 33 has an arc shape, a constant contact state can be ensured even if the auxiliary lip 51 comes into contact with a mating part (side surface of the guide rail 13) at an arbitrary point.

Further, the width tr of the lip piece 53 shown in FIG. 6 in the plate thickness direction is smaller than the plate thickness t of the seal member main body 55. As a result, the width dimension of the seal itself can be made equivalent to that of a standard single lip seal, and a compact configuration can be achieved.

FIG. 8 is an explanatory diagram showing the correlation between the arc radius of the auxiliary lip 51 and the protrusion amount.
The surface of the auxiliary lip 51 in the vertical cross section of the guide rail 13 in the longitudinal direction is formed in an arc shape. The contact point of the auxiliary lip 51 with the contact partner side differs depending on the deformed state of the lip piece 53 (see FIG. 6). If the auxiliary lip 51 is a polygonal lip, the contact state may change depending on the position of the contact point, and as a result, the seal friction / seal property may change significantly. The auxiliary lip 51 is preferably arcuate in order to avoid this change as much as possible. By forming the cross-sectional shape of the auxiliary lip 51 into an arc shape, it is possible to secure a constant contact state even if the contact point with the contact partner side changes due to the deformation of the lip piece 53.

The contact area with the contact partner should be as small as possible for the cross-sectional area S of the auxiliary lip 51, which is determined by the arc of the arc radius r and the protrusion amount a, which is the protrusion height from the surface of the lip piece 53. Can be reduced and the sealing friction can be reduced. The cross-sectional area S of the auxiliary lip 51 is obtained by the equation (1) as a function of the arc radius r and the protrusion amount a.

The cross-sectional area S is obtained by doubling the difference between the fan-shaped ABO and the triangular BCO shown in FIG. 8, and is represented by the equation (2).

Further, from the triangle BCO, the relationship between the arc radius r, the distance x, and the protrusion amount a is expressed by the equation (3).

The above equation (1) is derived by substituting the equation (3) into the equation (2).

FIG. 9 is a graph showing the correlation between the radius ratio (r / a) of the auxiliary lip 51 and the area ratio of the cross-sectional area S.
The curve shown in FIG. 9 is a result of calculating the cross-sectional area S by changing the arc radius r with the protrusion amount a as a constant and plotting the ratio of the cross- _{sectional area S to the cross-sectional area S 0 when r = a.} .. If the arc radius r is 5 times or less of the protrusion amount a, the amount of decrease becomes steep and the cross-sectional area can be significantly reduced.

FIG. 10 is a reference diagram showing an auxiliary lip 51 whose arc radius is less than the same size as the protrusion amount.
If the arc radius r is less than 1 times the protrusion amount a, a constriction occurs at the joint portion between the auxiliary lip 51 and the lip piece 53. Therefore, a problem arises in terms of the strength of the seal member. The appropriate arc radius r of the auxiliary lip 51 is preferably 1 to 5 times the protrusion amount a.

If the arc radius r is 5 times or less of the protrusion amount a, the cross-sectional area S can be significantly reduced. On the other hand, when the arc radius of the auxiliary lip 51 is less than the same as the protrusion amount a, a constriction occurs at the joint portion between the lip piece 53 and the seal member main body 55, which causes a problem in terms of strength. Therefore, if the arc radius of the auxiliary lip 51 is set within a range of 1 to 5 times the amount of protrusion from the surface of the lip piece 53, a particularly remarkable effect can be obtained for suppressing friction and improving strength. Become.

Next, an example in which the present invention is applied to the underseal 35 and the inner seal 37, which are seal members, will be described.
As shown in FIG. 3, the underseal 35 and the inner seal 37 are attached to the cage 27 so as to seal the space surrounded by the guide rail side raceway surface 19 and the slider side raceway surface 25. The underseal 35 and the inner seal 37 are made by reversing a seal having the same shape upside down, and a seal provided on the opening side of the concave groove 42A with respect to the raceway surface is provided on the side opposite to the underseal 35 and the opening side. The seal is the inner seal 37.

FIG. 11 is a cross-sectional view of the underseal 35 (inner seal 37) in the direction orthogonal to the longitudinal direction of the guide rail 13.
The underseal 35 and the inner seal 37 extend from the seal member main body 55A extending in the longitudinal direction of the guide rail and the seal member main body 55A toward the guide rail, and come into contact with the guide rail by the main lip 59 at the tip in the extending direction. It has a lip piece 53A and a lip piece 53A. The lip piece 53A is formed with an auxiliary lip 51 projecting outward from the main lip 59 to the connecting portion 57 connected to the seal member main body 55A on the surface on the side in contact with the guide rail. The underseal 35 and the inner seal 37 are long in the longitudinal direction of the guide rail 13, and the seal friction tends to increase. Therefore, the lip piece 53A has a thin wall shape so that the sealing friction can be suppressed as much as possible. Also in this auxiliary lip 51, the arc radius r is set to be the same as the protrusion amount a (protrusion height) in order to suppress the seal friction as much as possible.

Next, an example in which the present invention is applied to the side seal 41 which is a seal member will be described.
12 (A) is a front view of the side seal 41, and FIG. 12 (B) is a cross-sectional view taken along the line AA of FIG. 12 (A).
As shown in FIG. 12A, the side seal 41 is formed in a substantially U shape when viewed from the front, and has a shape that fits on both side surfaces and the upper surface of the guide rail 13. As shown in FIG. 12B, the side seal 41 is formed so as to cover other than the steel plate 65 arranged as the core metal on the slider body side when viewed from the side and the surface of the steel plate 65 on the slider body side. It has a seal member main body 55B. A lip piece 53B thinned by the groove 68 is formed on the side seal 41. A main lip 59 that contacts the guide rail is formed at the tip of the lip piece 53B, and an auxiliary lip 51 that projects toward the contact partner side between the lip piece 53B and the connection portion 57 side with the seal member main body 55B. Is formed.

The side seal 41 is a seal that is required to have high dust resistance, and the main lip 59 of the lip portion 69 has a thick wall and a highly rigid structure. Further, in the auxiliary lip 51, the arc radius r is set to 5 times the protrusion amount a as described above.

Next, the operation of the configuration of the seal member described above will be described.
In the linear motion guide device 11 according to the present embodiment, the seal member is provided with the main lip 59 at the tip end portion in contact with the guide rail 13, and the auxiliary lip 51 is provided at the proximal end side with respect to the main lip 59. Due to the relative positional relationship between the main lip 59 and the auxiliary lip 51, the auxiliary lip 51 can adjust the contact state with the contact partner side or the non-contact state according to the deformation of the main lip 59.

When the seal member has a small tightness with the contact partner side, the main lip 59 first comes into contact with the contact partner side. When the squeeze margin is increased, the main lip 59 and the auxiliary lip 51 come into contact with each other. Therefore, the seal member can function as a single lip seal or a double lip seal according to the purpose of use, and high slidability and high sealability can be selectively obtained. Further, since the auxiliary lip 51 has a cross section orthogonal to the longitudinal direction of the guide rail 13 formed in an arc shape, it is easy to always secure a constant contact state regardless of the change in the contact point.

For example, in a seal member for high dustproof use, the contact margin between the contact partner side and the main lip 59 is increased so that the auxiliary lip 51 and the contact partner side are brought into contact with each other. On the other hand, in the seal member for low friction use, the margin between the contact partner side and the main lip 59 is reduced to make single lip contact. In this case, the main lip 59 and the auxiliary lip 51 do not come into contact with the mating parts at the same time.

As described above, in the sealing member, by adjusting the sealing margin, it is possible to properly use the contact state according to the application, and the sealing property can be improved with the same width dimension as the single lip seal.

<Example of application to linear motion guidance device>
13 (A) is a plan view in which the table 73 of the transport device 71 including the linear motion guide device 11 is omitted, (B) is a front view of (A) including the table 73, and (C) is one of (B). It is an enlarged view of a part.
The linear motion guide device 11 including the seal member can be incorporated into the transport device 71, which is one of the mechanical devices. That is, in the linear motion guide device 11 of the present embodiment, the slider 15 is fixed in two rows parallel to each other on the upper surface of the base 75, which is the attached portion of the transport device 71. A pair of guide rails 13 are attached to the lower surface of the table 73, and the table 73 moves linearly with respect to the base 75. In the transfer device 71, the table 73 is arranged above and the base 75 is arranged below with respect to the direction of gravity (indicated by arrows). The guide rail 13 is attached to the table 73 with high accuracy so as to come into contact with the step provided on the table 73, that is, the shoulder 77.

Here, when the transport device 71 is used, foreign matter such as dust may fall from above. Therefore, the bottom surface seal 33 may be attached only to the outside of the slider 15 installed in parallel on the base 75, as shown in FIG. 13 (C). This is because the side of the linear motion guide device 11 where the shoulder 77 is located is covered above by the table 73, so that the need for dustproof performance is not high. Therefore, the bottom surface seal 33 is not attached on the side with the shoulder 77.

With this configuration, it is possible to secure a large height dimension (d1) from the bottom surface portion 31 of the slider 15 to the bottom surface of the guide rail. Therefore, the slider 15 is unlikely to interfere with the shoulder 77 of the table 73, which increases the degree of freedom in designing the transport device 71. On the other hand, since the side without the shoulder 77 is not covered by the table 73, dustproofing is necessary, and the bottom surface seal 33 is attached to the side of each slider 15 without the shoulder 77. Outside the width direction of each slider 15 (horizontal direction in FIG. 13B), the dimension (d2) in the height direction from the bottom surface 31 of the guide rail 13 to the bottom surface 31 of the slider 15 is small, but here. Since there is no shoulder 77, the design of the transport device 71 is not restricted.

As described above, even when the linear motion guide device 11 of the present embodiment is applied to the transport device 71, the underseal 35 and the bottom surface seal 33 are individually fixed (see FIG. 3), and therefore FIG. 13 (B). Only the bottom seal 33 on one side of the left and right sides can be removed. Therefore, the transport device 71 whose dustproof performance can be adjusted according to the surrounding environment can be obtained. Also in this transport device 71, since only the bottom surface seal 33 at an unnecessary portion can be omitted, the cost does not increase unnecessarily.

Then, according to the transport device 71 to which the linear motion guide device 11 of the present embodiment is applied, foreign matter such as dust, dust, chips, and chips can enter the gap formed between the guide rail 13 and the slider 15. It can be suppressed, and the rolling element 17 can be smoothly rolled over a long period of time.

As described above, the present invention is not limited to the above-described embodiment, and can be modified or applied by those skilled in the art based on the combination of the configurations of the embodiments with each other, the description of the specification, and the well-known technique. This is also the subject of the present invention and is included in the scope for which protection is sought.

For example, in the above configuration example, the case where the mechanical device is a transport device has been described as an example, but the mechanical device may include various other mechanical devices such as a lathe, a drilling machine, a boring machine, a milling machine, a gear cutting machine, and a grinding machine. It may be a device of.

11 Linear guide device 13 Guide rail 15 Slider 17 Rolling body 19 Guide rail side raceway surface (rolling body raceway surface)
23 End cap 25 Slider side raceway surface (rolling body raceway surface)
33 Bottom seal (seal member)
35 Underseal (seal member)
37 Inner seal (seal member)
41 Side seal (seal member)
51 Auxiliary lip 53, 53A, 53B Lip piece 57 Connection part 59 Main lip 71 Conveyor device (mechanical device)
r arc radius

Claims (9)

A guide rail extending in the longitudinal direction, a slider moving along the guide rail, and a sealing member for closing a gap between the guide rail and the slider are provided.
The seal member includes a seal member main body extending in the longitudinal direction and a lip piece extending from the seal member main body toward the guide rail and contacting the guide rail with a main lip at the tip in the extending direction. Have and
A linear motion guide device in which an auxiliary lip projecting outward is formed on the surface of the lip piece from the main lip to the connecting portion connected to the seal member main body on the surface on the side in contact with the guide rail. The seal member according to claim 1, wherein a state in which only the main lip is in contact with the guide rail and a state in which both the main lip and the auxiliary lip are in contact with the guide rail can be selectively set. Linear guidance device. The linear motion guide device according to claim 1 or 2, wherein the cross-sectional shape of the auxiliary lip orthogonal to the longitudinal direction is arcuate. The linear motion guide device according to claim 3, wherein the arc radius of the auxiliary lip is 1 to 5 times the protruding height of the auxiliary lip from the surface of the lip piece. The seal member main body is a plate-shaped member, and the lip piece extends from one end of the seal member main body in the plate thickness direction.
The linear motion guide device according to any one of claims 1 to 4, wherein the width of the lip piece in the plate thickness direction is smaller than the plate thickness of the seal member main body. A concave groove is formed on the bottom surface of the slider along the longitudinal direction, and the guide rail is housed in the concave groove.
The linear motion guide device according to any one of claims 1 to 5, wherein the seal member is a bottom seal fixed to the bottom surface of the slider and extended toward the side surface of the guide rail. A concave groove is formed on the bottom surface of the slider along the longitudinal direction, and the guide rail is housed in the concave groove.
A rolling element raceway surface on which a rolling element is rotatably arranged is provided on a side surface of the guide rail and an inner side surface of the concave groove of the slider facing the side surface.
Claims 1 to 5 that the seal member is an underseal arranged on the opening side of the concave groove with respect to the rolling element raceway surface, or an inner seal arranged on the side opposite to the opening side of the concave groove. The linear motion guide device according to any one of the above. A concave groove along the longitudinal direction is formed on the bottom surface of the slider, and the guide rail is housed in the concave groove.
End caps are arranged at both ends of the slider in the longitudinal direction.
The linear motion guide device according to any one of claims 1 to 5, wherein the seal member is a side seal fixed to the end cap and extended toward the guide rail. A mechanical device including the linear motion guide device according to any one of claims 1 to 8.

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