JP3307504B2 - Linear motion rolling guide unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear motion rolling guide unit in which a slider comprising a casing, an end cap and the like is slidable on a track rail via a rolling element.

[0002]

2. Description of the Related Art Conventionally, a linear motion rolling guide unit is shown in FIG.
1 is known. FIG. 11 is a perspective view showing an example of a conventional linear motion rolling guide unit. The conventional linear motion rolling guide unit comprises a track rail 1 having track grooves 9 formed on both side walls 11 in the longitudinal direction, and a slider 7 slidably mounted on the track rail 1. . The slider 7 is slidable relative to the track rail 1 and is positioned at a position facing each track groove 9.
Rolling element 4 composed of a large number of balls rolling relatively movably between opposing raceway grooves 8 and 9
End caps 5 attached to both ends of the casing 2 in the sliding direction, that is, in the longitudinal direction.
And has a lower surface seal 3 disposed on the lower surface. In order to prevent the rolling elements 4 from falling off the casing 2, a holding band 17 is attached to the casing 2 so as to surround the rolling elements 4. A grease nipple 18 is provided on an end surface of the side seal 6 to supply a lubricant to a sliding surface between the track rail 1 and the slider 7.

The slider 7 is mounted on the track rail 1 so as to be laid on the track rail 1 and slides freely with the interposition of a rolling element 4 composed of a number of balls circulating along the track groove 9 of the track rail 1. is there. That is, the rolling elements 4 in the load region running in the raceway groove 9 of the raceway rail 1 are guided to a direction change path (see reference numeral 34 in FIG. 2) formed in the end cap 5, and further, the raceway groove of the casing 2. The rolling element 4 moves to the return passage hole 10 formed above the parallel to the return passage 8, and the numerous rolling elements 4 circulate infinitely in the endless circulation path. Thus, the rolling of the loaded rolling element 4 located between the raceway groove 8 formed on the slider 7 and the raceway groove 9 of the raceway rail 1 allows the raceway rail 1 and the slider 7 to slide freely. Can perform relative movement.

In the linear motion rolling guide unit, dust and dirt are formed in the raceway groove 9 of the track rail 1 and the raceway groove 8 of the slider 7.
If foreign matter such as dust, dirt, and swarf adheres, the slider 7 may hinder the smooth rolling of the rolling element 4 when sliding on the track rail 1. In order to prevent this, a seal device is provided between the slider 7 and the track rail 1. As the sealing device, there are a side seal 6 attached to the outer end surface of the end cap 5, a lower surface seal 3 provided on the lower surface of the slider 7, and the like.

Although the side seal 6 is effective for removing foreign matter adhering to the upper surface 14 of the track rail 1, the foreign matter collected in the bolt insertion hole 33 of the track rail 1 enters the inside of the slider 7. That is, the linear motion rolling guide unit is
A bolt insertion hole 33 for inserting a mounting bolt into the upper surface 14 of the track rail 1 is opened, and foreign matter easily accumulates in the opening. Such an opening or upper surface 14 of the track rail 1
It is difficult to completely wipe off the foreign matter accumulated in the side seal 6 with the side seal 6, and when the foreign matter that has passed through the side seal 6 scatters inside the slider 7, the raceway grooves 8, on which the rolling elements 4 roll,
9 may enter. Therefore, in the conventional linear motion rolling guide unit, an upper surface seal is provided in order to prevent foreign matter that has entered from the side seal 6 from entering the raceway grooves 8 and 9.

As an example of an upper surface seal constituting the above-mentioned sealing device, a seal as shown in FIG. 8 is conventionally known (see Japanese Utility Model Publication No. 6-2026). FIG. 8 is a front view of the conventional linear motion rolling guide unit, in which the right half of the end cap is cut away. The top seal 50 is
A track rail 5 is provided on a lower surface 52 of a slider 51 having a U-shaped cross section.
3 is mounted facing the upper surface 56. Top seal 5
Reference numeral 0 denotes a spring plate 54 formed by bending a steel plate upward to provide spring performance, and a pair of seal plates 55 fixed to both side edges of the spring plate 54 and extending in the longitudinal direction of the track rail 53, respectively. It is composed of Seal plate 5
5 has a rectangular cross-sectional shape, and the lower surface of the seal plate 55 is pressed against the upper surface of the track rail 53 by the spring plate 54 to make surface contact in the longitudinal direction. Alternatively, the lower surface of the seal plate 55 may be formed by forming a plurality of ridges along the longitudinal direction so that the lower surface of the seal plate 55
May be in line contact with the upper surface 56 in the longitudinal direction. The upper surface seal 50 is attached to the lower surface 52 of the slider 51 by fixing the spring plate 54 to the lower surface 52 of the slider 51 with screws 57.

In the conventional linear motion rolling guide unit, a side seal 45 constituting a sealing device is attached to an end cap 46 using a small screw 47. The side seal 45 has a semicircular seal projection 48, which is formed on the side wall of the track rail 53, and
Foreign matter adhering to 9 is removed by wiping. A grease nipple 58 is attached to the end cap 46, and the grease supplied from the grease nipple 58 is supplied to the raceway groove 59 of the slider 51.

As another conventional example of the upper surface seal, for example, the one shown in FIGS. 9 and 10 is known (see Japanese Patent Application Laid-Open No. 5-26236). FIG. 9 is an enlarged sectional view showing a conventional linear motion rolling guide unit, and FIG. 10 is a plan view of a top seal. Top seal 6
Numeral 0 is attached to a lower surface 62 inside a slider 61 having a U-shaped cross section so as to face an upper surface 64 of a track rail 63. The upper surface seal 60 includes a flat plate 65 and a pair of seal plates 66 fixed to both side edges of the plate 65 and extending long in the longitudinal direction of the track rail 63.

The plate 65 includes a base portion 68 having a width dimension equal to or larger than the opening diameter of the bolt insertion hole 67 formed in the track rail 63, and a bent portion 69 formed by bending both side edges of the base portion 68 in the longitudinal direction. have. Plate 6
As shown in FIG. 10, a pair of elastic narrow insertion portions 70 are protruded from both ends in the longitudinal direction of 5. The upper surface seal 60 is fixed to the slider 61 by inserting the insertion portion 70 into an insertion groove formed on a side surface of an end cap (not shown).

Each seal plate 66 is provided on the upper surface 6 of the track rail 63.
4, and each tip lip 71, 71 is inclined in a direction approaching each other. That is, each tip lip 71 has a shape inclined toward the center area C of the track rail 63. And the sealing plate 6
Due to the elastic force of the plate 6 itself and the elastic force of the insertion portion 70 of the plate 65, the tip lip 71 of the seal plate 66
3 is pressed against the upper surface 64 with a predetermined pressing force to form a sealing surface.

In the linear motion rolling guide unit, since the tip lip 71 of the upper surface seal 60 is inclined toward the central area C, the grease supplied from the grease nipple to the holding chamber 73 via the supply path 72. When the pressure in the holding chamber 73 becomes high, the tip lip 71 is pushed out toward the central area C, and as a result, the grease is discharged to the central area C.

[0012]

However, the conventional top seal has problems in the following points. First, FIG.
In the linear motion rolling guide unit shown in (1), the upper seal 50 is configured to press the seal plate 55 against the upper surface 56 of the track rail 53 by the elastic force of the spring plate 54. It largely depends on the manufacturing accuracy of the plate 54. Therefore, if the manufacturing accuracy of the spring plate 54 is poor, the sealing plate 5
Insufficient pressing force of No. 5 causes intrusion of foreign matter and leakage of grease. Since the upper surface seal 50 is configured so that the seal plate 55 is pressed against the upper surface 56 of the track rail 53 by the spring plate 54 manufactured by forming a steel plate into a convex shape, the lower surface 52 of the slider 51 and the track rail 53 are formed.
It is necessary to secure a certain distance between the linear motion rolling guide unit and the size or thickness of the linear motion rolling guide unit. Further, since the upper surface seal 50 is configured to screw the spring plate 54 to the lower surface 52 of the slider 51 using the screw 57, the head of the screw 57 projects toward the upper surface 56 of the track rail 53. Therefore, the thinning of the linear motion rolling guide unit is limited. Also, screw 5
In order to prevent the head of No. 7 from interfering with the upper surface 56 of the track rail 53, it is necessary to form a concave streak 56A in the central region C of the upper surface 56 of the track rail 53 in the longitudinal direction.
There is a problem that foreign matter easily accumulates on the concave streak 56A of the track rail 53. Further, the screwing has a problem that the assembling work at the time of manufacturing becomes complicated and the manufacturing cost is increased.

In the linear motion rolling guide unit shown in FIG. 9, the upper seal 60 is attached to the slider 61 at the same time when end caps (not shown) are attached to both ends in the longitudinal direction of the casing. That is, the top seal 60 is fixed to the slider 61 by screwing the end cap to the casing with the insertion portion 70 of the plate 65 inserted into the insertion groove formed on the side surface of the end cap. When the upper surface seal 60 is removed and replaced, the operation is the reverse of the above-described process. Therefore, the work of assembling the upper surface seal 60 to the slider 61 is complicated, and the manufacturing cost is increased. In addition, the sealing plate 6
6, the tip lip 71 must be further pressed against the upper surface 64 of the track rail 63 by the elastic force of the insertion portion 70 of the plate 65.

An object of the present invention is to solve the above-mentioned problems, and has a feature in a structure of a top seal capable of preventing foreign substances from entering a raceway groove and a mounting structure thereof.
When the upper seal is mounted on the lower surface of the slider, the mounting structure is so configured that the mounting work is simple and there is no part that protrudes from the upper seal toward the track rail.
The distance between the lower surface of the casing and the upper surface of the track rail is reduced to reduce the overall thickness of the device, and when attaching the upper seal to the slider, the slider is assembled by first attaching end caps to both ends in the longitudinal direction of the casing. After that, the top seal can be attached to the ceiling surface of the slider afterwards, and the top seal can be removed from the slider without removing the end cap from the casing even when removing the top seal from the slider. The object is to provide a dynamic rolling guide unit.

[0015]

SUMMARY OF THE INVENTION The present invention is directed to a track rail having track grooves formed on both side walls in the longitudinal direction, the track rail being slidable relative to the track rail, and each of the track grooves being opposed to the track groove. A casing formed, end caps attached to both ends in the longitudinal direction of the casing, rolling elements rolling between the opposed raceway grooves, side seals respectively provided on outer end faces of the end caps, and In a linear motion rolling guide unit having an upper surface seal disposed on a lower surface of the casing opposed to an upper surface, the upper surface seal includes a plate-shaped core extending along lower surfaces of the casing and the end cap, and the plate-shaped core. Lip seals which are fixed to the upper surface of the track rail and are in sliding contact with the upper surfaces of both sides of the track rail, respectively. A tongue-shaped protrusion protruding at the center of the notch, an insertion hole is formed in a lower surface of the end cap, and the tongue-shaped protrusion is formed shorter than both ends of the plate-shaped metal core; The sum of the lengths of the tongue-shaped protrusions is longer than twice the total length of the insertion of the tongue-shaped protrusions into the insertion hole, and the length of the insertion hole is equal to the insertion length of the tongue-shaped protrusion. The present invention relates to a linear motion rolling guide unit formed so as to be longer than the total sum, wherein the tongue-shaped protrusion of the plate-shaped core is inserted so as to be inserted into the insertion hole of the end cap.

In the linear motion rolling guide unit, a projection is formed on both sides of the notch formed in the plate-shaped metal core, and the projection is in contact with the side seal, and the end is provided. The insertion hole of the cap is formed in a projection projecting from a groove formed in the lower surface of the end cap. The notch formed in the plate-shaped metal core is fitted to the projection of the end cap. The tongue-shaped protrusion is inserted into the insertion hole by guiding the protrusion of the plate-shaped core metal along the groove of the end cap.

Further, the plate-shaped core is made of an elastic material. Further, the plate-shaped metal core is formed of a flat plate. Alternatively, the plate-shaped metal core may be formed so that a central portion where the tongue-shaped projections are formed is convex in a transverse cross section deviated upward from both sides, and the end cap is disposed at a position deviated from the lower surface. May be formed.

Since this linear motion rolling guide unit is constructed as described above, there is no need for a separate means for fixing the upper surface seal to the slider, and there is no component protruding from the upper surface seal to the track rail side. The distance between the lower surface of the end cap and the upper surface of the track rail can be reduced, and the entire device can be made thinner. In particular, in this linear motion rolling guide unit, the total length of the tongue-shaped projections provided at both ends in the longitudinal direction of the cored bar is larger than twice the total length of the insertion lengths of the tongue-shaped projections into the insertion holes. The length of the insertion hole is longer than the sum of the insertion lengths of the tongue-shaped protrusions, so if the top seal is slid, the tongue-shaped protrusions can be easily inserted from the insertion holes. Exit. Therefore,
The top seal can be easily removed from the slider without removing the end cap from the casing, as long as at least one of the side seals is unscrewed.
In other words, this linear motion rolling guide unit is configured so that the tongue-shaped protrusion is detachable from the insertion hole when at least one of the side seals is separated from the outer end face of the end cap. Has
What is necessary is just to loosen the screw which is screwing at least one side seal. When the screw of the side seal is loosened, the top seal, which has been restricted from moving in the longitudinal direction by the side seal, is released and becomes slidable.

Further, the upper seal is attached to the slider by incorporating a rolling element into the casing, overlapping the side seal on the outer end face of the end cap, and screwing the end cap and the side seal together to the casing. Assembled. Here, to attach the side seal to the end cap, loosen the screw,
When the side seal is separated from the outer end surface of the end cap, the tongue-shaped protrusion of the plate-like core of the top seal can be inserted into the insertion hole of the end cap. In this state, when the screw is tightened, the tongue-shaped projections of the top seal engage with the respective insertion holes of the end cap, and both end faces in the longitudinal direction of the lip seal of the top seal abut against each side seal. Since the top seal is constrained in the longitudinal direction, the top seal does not come off the slider. Further, since both end surfaces in the longitudinal direction of the lip seal of the top seal abut against each side seal, the top seal and the side seal are connected in a sealed state. When the tongue-shaped protrusion of the top seal is inserted into the insertion hole of the end cap, the top seal is slid in the longitudinal direction with the protrusion of the top seal in contact with the groove formed on the lower surface of the end cap. , The protrusion is guided by the concave groove or the lower surface,
The tongue of the top seal is easily inserted into the insertion hole of the end cap, and the top seal is attached to the end cap.

When the plate core of the top seal is made of a spring plate having high elasticity, the tongue-shaped projection can be formed by warping the plate core in the longitudinal direction without loosening the screw for attaching the side seal. The part can be inserted into the insertion hole of the end cap.

In this linear motion rolling guide unit, the end cap and the side seal are overlapped and attached to the end face of the casing together with a common screw. However, the end cap is screwed to the end face of the casing to mount the slider. For linear motion rolling guide units, in which the side seal is attached to the outer end face of the end cap after assembly by means of another screw, the top seal can also be installed or removed by loosening the screws and pulling the side seal apart. Can be.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a linear motion rolling guide unit according to the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing an embodiment of a linear motion rolling guide unit according to the present invention, and corresponds to a cross-sectional view taken along line AA of the conventional linear motion rolling guide unit shown in FIG. FIG. 2 is a side sectional view of the linear motion rolling guide unit of FIG. 1, and FIG. 3 is a bottom view of the linear motion rolling guide unit of FIG. Since this embodiment has basically the same configuration as the conventional linear motion rolling guide unit shown in FIG. 11, the same components as those of the conventional linear motion rolling guide unit shown in FIG. The same reference numerals are given and duplicate descriptions are omitted. In this embodiment, in FIG.
Although a type using a ball is shown as the example, the present invention is not limited to the ball, and can be applied to a type using a roller.

The linear motion rolling guide unit comprises a base 1
The track rail 1 has a track groove 9 formed on both side walls 11 in the longitudinal direction and has a track groove 9, and a slider 7 slidably slidably over the track rail 1. The slider 7 is relatively slidable with respect to the track rail 1 and has a track groove 8 formed at a position facing each track groove 9. It has a number of rolling elements 4 running and end caps 5 attached to both longitudinal ends of the casing 2.
A holding band 17 is attached to the casing 2 so as to surround the rolling element 4 in order to prevent the rolling element 4 from falling off the casing 2. A grease nipple 18 is attached to the end cap 5 to supply a lubricant to a sliding surface between the track rail 1 and the slider 7. The grease supplied from the grease nipple 18 is
It is held in the holding chamber 12A in the casing 2 and lubricates the opposed raceway grooves 8 and 9. The side seal 6 is for the track rail 1
And a seal portion (not shown) that slides on the side wall surface 11 and slides on the raceway groove 9.

The slider 7 is mounted on the track rail 1 in a state of being straddled, and freely slides with the interposition of a rolling element 4 composed of a plurality of balls rolling along the track groove 9 of the track rail 1. Is what you do. That is, the rolling elements 4 in the load area rolling on the track grooves 9 of the track rail 1 are guided to the direction change path 34 formed in the end cap 5, and then parallel to and above the track grooves 8 of the casing 2. The rolling element 4 moves to the return passage hole 10 formed in the infinite circulation path infinitely. Thus, the rolling of the loaded ball 4 located between the raceway groove 8 formed on the slider 7 and the raceway groove 9 of the raceway rail 1 causes the raceway rail 1 and the slider 7 to slide relative to each other. I can exercise.

The slider 7 is provided with side seals 6 disposed on the outer end surface 27 of the end cap 5, that is, on the side opposite to the casing.
The lower surface seal 3 disposed on the lower surface of the casing 2 and the end cap 5 and the lower surface 13 inside the casing 7 and the lower surface 13E of the end cap 5 extend between the lower surfaces 13 and 13E and the upper surface 14 of the track rail 1. It has an upper surface seal 19 disposed in the space 12 therebetween. The side seal 6 has a raceway groove 9 similar to the conventional one shown in FIG.
, And a seal protrusion 6A that slides on the upper surface 14 of the track rail 1. The lower seal 3 is provided with a lip 21 that slides on the side wall surface 11 of the track rail 1, and seals the track rail 1, the casing 2, and the end cap 5 in the vertical direction. The upper surface seal 19 includes a pair of lip seals 22 slidingly contacting the side region S of the upper surface 14 of the track rail 1.
And the lower surfaces 13 and 13E of the slider 7 and the track rail 1
To seal the upper surface 14 of the track rail 1
Foreign matter is prevented from entering into the space 12A communicating with the track grooves 8, 9 from the space 12 between the upper surface seal 19 and the upper surface seal 19. The width of the upper surface seal 19 is basically the same as that of the upper surface 1 of the track rail 1.
4, the width is smaller than the width of the upper surface 14 of the track rail 1. A space 12A between the track rail 1 and the slider 7 is an area containing a lubricant to be supplied to the track grooves 8, 9.

As shown in FIG. 3, the upper surface seal 19 extends along the lower surfaces 13 and 13E of the casing 2 and the end cap 5, and is fixed to the plate core 20 by baking or the like. It has a pair of elongated lip seals 22 slidably in contact with upper surfaces on both sides of the rail 1. The plate-shaped metal core 20 has a notch 35 formed at the center of both ends and a tongue-like projection 23 projecting from the center of the notch 35. The lip seal 22 is made of an elastic material such as rubber, plastic or the like, and the tip lip of the lip seal 22 is in sliding contact with the upper surface side region S of the track rail 1. The tip lip is inclined toward the center area C of the track rail 1. The plate-shaped metal core 20 is a flat plate as shown in a sectional shape in FIG. Further, the plate-shaped metal core 20 has a pair of protruding portions 16 extending in the longitudinal direction along both side edges at both ends in the longitudinal direction of the rectangular plate. The plate-shaped core 20 is
Between the pair of projections 16, there is a tongue-like projection 23 inserted into an insertion hole (described later) of the end cap. Further, the length of the tongue-shaped protrusion 23 formed on the plate-shaped cored bar 20 is formed shorter than the length of the protrusion 16.

The end cap 5 has a gate-like shape and is formed with a concave groove 28. A convex portion 24 protruding toward the track rail 1 is formed in a central region of the lower surface 13E. Has an insertion hole 25 formed along the lower surface 13E. The convex portion 24 does not extend from the inner end surface 26 of the end cap 5 abutting on the casing 2 to the outer end surface 27 of the end cap 5 to which the side seal 6 is attached.
It is formed near the outer end face 27. The lower surface 13 of the casing 2 facing the upper surface 14 of the track rail 1 has a groove 1
5, the width of the concave groove 15 is formed substantially equal to the width of the upper surface seal 19, and the plate-shaped metal core 20 of the upper surface seal 19 is fitted into the concave groove 15. The upper surface of the insertion hole 25 has the concave groove 1
5 is formed so as to be flush with the bottom surface.

The slider 7 is assembled by screwing the end cap 5 and the side seal 6 at both ends in the longitudinal direction of the casing 2 with common screws (not shown). When the upper surface seal 19 is attached to the slider 7, the lip seal 22 of the upper surface seal 19 has both ends in the longitudinal direction abutting against the side surface seal 6, so that the contact surface between the upper surface seal 19 and the side surface seal 6 is sealed. , And the top seal 19 is restrained in the longitudinal direction. When the upper surface seal 19 is attached to the slider 7, the lip seal 22 and the lower surface 13E of the end cap 5 are removed.
Is the distance of one sheet metal 20,
The gap between the lower surface 13E and the upper surface 14 of the track rail 1 is considerably smaller than that of the conventional one.

When the upper surface seal 19 is mounted on the slider 7, the insertion hole 2 of the tongue-shaped protrusion 23 is
5 is set to be short. That is, the total sum 2D of the lengths D of the tongue-shaped protrusions 23 formed at both ends in the longitudinal direction of the plate-shaped metal core 20 is equal to the insertion length L of the tongue-shaped protrusion 23 into the insertion hole 25 of the end cap 5. The length of the insertion hole 25 is set to be larger than the length D of the tongue-shaped projection 23, which is larger than twice the total sum 2L. To be precise, the length of the insertion hole 25 is
Is set to be larger than the total sum 2L of the insertion lengths L.
Therefore, when the screw of one side seal 6 is loosened, the plate core 20 can be slid toward the side seal 6 on the loosened side. Further, when the plate-shaped core metal 20 is slid, the tongue-like projection 23 comes out of the insertion hole 25 of the end cap 5 to which the other side seal 6 is attached, and the top seal 19 can be removed from the slider 7.

Next, a method of attaching the upper surface seal 19 to the slider 7 will be described. The rolling element 4 is incorporated into the raceway groove 8 of the casing 2 and the return passage hole 10 of the end cap 5, and the end cap 5 is disposed on both end surfaces in the longitudinal direction with the casing 2 interposed therebetween. The slider 7 is assembled by superposing the side seal 6 on the end face 27, that is, the end face on the side opposite to the casing, and screwing the end cap 5 and the side seal 6 to the casing 2 with screws.

When the top seal 19 is attached to the slider 7, the screws that screw the side seal 6 to the end cap 5 are slightly loosened. Thereby, the top seal 1
Since the side seal 6 that has been in contact with the protrusion 16 of the block 9 and restrained the top seal 19 so as not to move is detached from the end cap 5, the top seal 19 is slid toward the side seal 6 on the side where the screw is loosened. Will be able to do that. When the top seal 19 is slid and one of the tongue-shaped projections 23 is pushed into one of the insertion holes 25 of the end cap 5, the tip of the other tongue-shaped projection 23 is positioned at the entrance of the other insertion hole 25, and Can be inserted into the insertion hole 25. At the time of insertion, a pair of protrusions 1 formed on
6 is a concave groove 28 formed on the lower surface 13E of the end cap 5.
Of the tongue 23
Is inserted into the insertion hole 25. Next, when the screw is tightened, the longitudinal end face of the lip seal 22 comes into contact with the side seal 6, and the upper seal 19 is restrained in the longitudinal direction, and the state shown in FIG. 3 is obtained.

Conversely, when the upper surface seal 19 is removed from the slider 7 to replace the upper surface seal 19, the following method is used. First, the screw that has screwed the side seal 6 to the end cap 5 is loosened.
As a result, the side seal 19, which abuts on the protrusion 16 of the upper seal 19 and restrains the upper seal 19 from moving, is separated from the end cap 5, so that the side seal 6 on the side on which the screw is loosened is moved. The upper surface seal 19 can be slid. When the upper surface seal 19 is slid and one of the tongue-shaped protrusions 23 is pushed into one of the insertion holes 25 of the end cap 5, the other tongue-shaped protrusion 23 comes out of the other insertion hole 25. 7 can be easily removed.

As described above, in this linear motion rolling guide unit, the side seal 6 is formed on the outer end face 27 of the end cap 5.
Therefore, foreign matter adhering to the track rail 1 penetrates between the upper surface 14 of the track rail 1 and the ceiling surface 13 of the slider 7 by the side seals 6, and contacts the side wall surfaces 11 of the track rail 1. Inner surface 32 of slider 7
Is prevented.

However, when foreign matter is accumulated in the bolt insertion hole 33 opened on the upper surface 14 of the track rail 1,
It is difficult to completely wipe off the foreign matter accumulated in the bolt insertion hole 33 by the seal protrusion 6A of the side seal 6 that slides on the upper surface 14 of the track rail 1. Foreign matter that has passed through the side seal 6 scatters inside the slider 2,
Since the groove 9 is provided, foreign matter is prevented from entering the raceway grooves 8 and 9. That is, the upper surface seal 19 is used for the track rail 1.
A pair of lip seals 22 are provided for sliding contact with both side areas S of the upper surface 14 of the rail, respectively. Since the tip lip is inclined toward the center area C of the track rail 1, the side seal 6 and the track rail 1 The tip lip is strongly pressed against the upper surface 14 of the track rail 1 when foreign matter that has entered the inside of the slider 7, that is, the space 12, passes through the space between the upper surface 14 and the space groove 8, 9. And foreign matter is prevented from entering the track grooves 8 and 9.

Next, another embodiment of the linear motion rolling guide unit according to the present invention will be described. FIG. 4 is an exploded perspective view showing the linear motion rolling guide unit according to the present invention.
Among the reference numerals in the figure, the same reference numerals are used for those having the same functions as those of the embodiment shown in FIGS. 1 to 3. Referring to FIG. 4, the end cap 5 has a return passage hole 10 formed in the inner end face 26, that is, the mounting surface to the casing 2. End cap 5
Is formed in a gate shape by a concave groove 28, and a convex portion 24 protruding toward the track rail is formed in a central region of a lower surface facing the upper surface of the track rail 1. The insertion hole 25 is formed along. The protrusion 24
The end cap 5 extends from the inner end surface 26 to the outer end surface 27, and is different from the convex portion 24 of the previous embodiment, but is easy to manufacture. A concave groove 28 is formed in a side region of the lower surface. The upper surface of the insertion hole 25 is formed so as to be flush with the bottom surface of the concave groove 28.

The upper surface seal 19 comprises a plate-shaped metal core 20 made of a rectangular plate and a pair of elongated lip seals 22 fixed to both side edges of the plate-shaped metal core 20 by baking. The lip seal 22 is made of an elastic material such as rubber or plastic.
It comes into sliding contact with the upper surface side region S of the track rail 1. The tip lip is inclined toward the center area C of the track rail 1. FIG. 5 shows an end view of the top seal 19, and the plate-shaped core 20 has a flat cross section. Further, the plate-shaped metal core 20 has a pair of protrusions 16, 16 extending in the longitudinal direction along both side edges at both ends in the longitudinal direction of the rectangular plate. The width of the upper surface seal 19 is formed smaller than the width of the upper surface 14 of the track rail 1, and the width of the protrusion 16 is
The width of each of the grooves 28 formed on the lower surface 13E of the end cap 5 is smaller than the width of each of the grooves 28. Further, the plate-shaped metal core 20 has a tongue-shaped protrusion 23 formed between the pair of protrusions 16, and the tongue-shaped protrusion 23 is inserted into the insertion hole 25 of the end cap 5. As is clear from FIG. 4, the length of the tongue-shaped protrusion 23 formed on the plate-shaped core 20 is shorter than the length of the protrusion 16. Further, as shown in FIG. 5, the protruding portion 16 and the tongue-shaped protruding portion 23 are formed on the same plane.

FIG. 6 is a bottom view showing a state in which the upper seal 19 is incorporated in the linear motion rolling guide unit. The slider 7 is assembled by screwing the end cap 5 and the side seal 6 to both ends in the longitudinal direction of the casing 2 with a common screw 29. When the upper surface seal 19 is attached to the slider 7, the lip seal 22 of the upper surface seal 19 has both ends in the longitudinal direction abutting against the side surface seal 6, respectively. Therefore, the contact surface between the upper surface seal 19 and the side surface seal 6 is sealed. , And the top seal 19 is restrained in the longitudinal direction. When the upper surface seal 19 is attached to the slider 7, the distance between the lip seal 22 and the lower surface 13E of the end cap 5 is the distance of one sheet metal 20, so that the lower surface 13E and the upper surface of the track rail 1 are provided. The gap with 14 is considerably smaller than the conventional one.

The length L of the tongue-like projection 23 inserted into the insertion hole in the mounting state when the upper surface seal 19 is mounted on the slider 7 is set to be short. That is, the total sum 2D of the lengths D of the tongue-shaped protrusions 23 formed at both ends in the longitudinal direction of the plate-shaped metal core 20 is equal to the insertion length L of the tongue-shaped protrusion 23 into the insertion hole 25 of the end cap 5. The length of the insertion hole 25 is set to be larger than the length D of the tongue-shaped projection 23, which is larger than twice the total sum 2L. To be precise, the length of the insertion hole 25 is
Is set to be larger than the total sum 2L of the insertion lengths L.
Therefore, when the screw 29 of one side seal 6 is loosened, the plate core 20 can be slid toward the loosened side seal 6. Further, when the plate-shaped core metal 20 is slid, the tongue-like projection 23 comes out of the insertion hole 25 of the end cap 5 to which the other side seal 6 is attached, and the top seal 19 can be removed from the slider 7.

Next, a method of attaching the upper surface seal 19 to the slider 7 will be described. The rolling elements are incorporated into the raceway groove of the casing 2 and the return passage hole 10 of the end cap 5, and the end caps 5 are respectively arranged on both end surfaces in the longitudinal direction with the casing 2 interposed therebetween. The slider 7 is assembled by superposing the side seal 6 on the end face on the side opposite to the casing 27, and screwing the end cap 5 and the side seal 6 on the casing 2 with screws 29.

When the upper surface seal 19 is attached to the slider 7, the screw 29 that has screwed the side seal 6 to the end cap 5 is loosened slightly, so that the upper surface seal 19 comes into contact with the protruding portion 16 of the upper surface seal 19. Since the side seal 6 that restrains the side seal 6 from moving is separated from the end cap 5, the top seal 19 can be slid toward the side seal 6 on the side where the screw 29 is loosened. When the top seal 19 is slid and one of the tongue-shaped projections 23 is pushed into one of the insertion holes 25 of the end cap 5, the tip of the other tongue-shaped projection 23 is positioned at the entrance of the other insertion hole 25, and Can be inserted into the insertion hole 25. At the time of insertion, a pair of projecting portions 16 formed on
Is guided by the side wall of the concave groove 28 formed on the lower surface 13E of the end cap 5, and the tongue-like projection 23 is inserted into the insertion hole 25. Next, when the screw 29 is tightened, the longitudinal end face of the lip seal 22 comes into contact with the side seal 6 and is restrained, so that a state as shown in FIG. 6 is obtained.

When the plate-shaped core 20 of the upper surface seal 19 is made of a thin elastic leaf, the plate-shaped core 20
Can be bent in the longitudinal direction, that is, warped to insert the tongue-shaped protrusion 23 of the plate-shaped core 20 into the insertion hole 25 of the end cap 5.

Conversely, when the upper surface seal 19 is to be removed from the slider 7 for replacement or the like, the following method is used. First, by loosening the screw 29 which screwed the side seal 19 to the end cap 5, the side seal 6 which was in contact with the projection 16 of the top seal 19 and restrained the top seal 19 from moving does not end. Since it is detached from the cap 5, the upper seal 19 can be slid toward the side seal 6 on the side where the screw 29 is loosened. When the top seal 19 is slid and one of the tongue-shaped projections 23 is pushed into the insertion hole 25 of the end cap 5, the other tongue-shaped projection 23 comes out of the other insertion hole 25, so that the top seal 19 is removed from the slider 7. It can be easily removed.

Next, another embodiment of the linear motion rolling guide unit according to the present invention will be described. FIG. 7 is an end view showing another embodiment of the upper surface seal incorporated in the linear motion rolling guide unit according to the present invention. The upper surface seal 30 has a plate-shaped core 31 having a convex cross-sectional shape and a tongue-shaped projection 23.
Has the same configuration as the top seal 19 shown in FIGS. 4 to 6 except that it is formed so as to be deviated from the pair of protrusions 22. When the upper surface seal 30 is employed, instead of the end cap 5 having the convex portion 24 on the lower surface 13E as shown in FIG. An end cap formed at a position deviated from the end cap can be used.
When the upper surface seal 30 is used, for example, the shape shown in FIG. 8 may be adopted for the lower surface of the casing including the shape shown in FIG.

[0044]

Since the linear motion rolling guide unit is constructed as described above, the fixing means such as a screw does not protrude from the upper seal to the track rail side as in the prior art, and the upper seal is terminated at the end. With attached to the cap,
The distance between the lip seal of the upper seal and the lower surface of the end cap is the distance of one sheet metal. The distance between the lower surface of the casing and the upper surface of the track rail can be reduced, and the overall thickness of the device can be reduced. be able to. In particular, when removing the top seal, without removing the end cap as in the conventional linear motion rolling guide unit, simply pull the side seal away from the end cap, for example, just loosen the screw for attaching the side seal. Since the upper seal can be slid in the longitudinal direction, the upper seal can be easily removed from the slider. That is, when the screws for attaching the side seals are loosened, the linear seal rolling guide unit becomes unremovable in the longitudinal direction by the side seals.
It can be slid in the longitudinal direction, and the sum of the lengths of the tongue-shaped protrusions provided at both ends in the longitudinal direction of the plate-shaped metal core is the sum of the total length of the tongue-shaped protrusions inserted into the insertion holes. The dimensions are set to be larger than twice, and the length of the insertion hole is longer than the total insertion length of the tongue-shaped projections.
If the top seal is slid in the longitudinal direction, the tongue-like projection easily comes off the insertion hole. Therefore, without removing the end cap from the casing, the top seal can be removed from the slider as long as the screw of the side seal is loosened, and the replacement work of the top seal can be easily performed.

In this linear motion rolling guide unit, a slider is assembled by mounting a rolling element in a casing, and mounting a pair of end caps and a side seal so as to sandwich the casing in which the rolling element is inserted, and assembling the slider. Since the top seal can be attached to the slider, the top seal can be easily attached to the slider as compared with the conventional method of incorporating the top seal during the slider assembly process. The efficiency of assembly work can be improved.

The tongue-shaped protrusion formed on the plate-shaped metal core of the upper surface seal is formed shorter than the protrusion, and the end cap has a concave groove on the lower surface for guiding the protrusion of the plate-shaped metal core. Therefore, when the upper surface seal is slid in the longitudinal direction in a state where the protrusion is in contact with the groove, the protrusion is guided by the groove, that is, the protrusion formed on the lower surface of the end cap,
The tongue is inserted into the insertion hole. Therefore, also in this sense, the top seal can be easily attached to the end cap, and the manufacturing cost can be reduced. Further, since the upper surface seal can be attached simply by inserting it into the insertion hole of the end cap, there is no need for any fixing parts for mounting such as bolts or screws, so that the number of parts can be reduced. Also, no special tools or devices are required for mounting.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a linear motion rolling guide unit according to the present invention.

FIG. 2 is a side sectional view of the linear motion rolling guide unit of FIG. 1;

FIG. 3 is a bottom view of the linear motion rolling guide unit of FIG. 1;

FIG. 4 is an exploded perspective view showing another embodiment of the linear motion rolling guide unit according to the present invention.

FIG. 5 is an end view showing one embodiment of a top seal shown in FIG. 4;

FIG. 6 is a bottom view of the linear motion rolling guide unit of FIG. 4;

FIG. 7 is an end view showing another embodiment of the top seal incorporated in the linear motion rolling guide unit according to the present invention.

FIG. 8 is a front view showing an example of a conventional linear motion rolling guide unit, wherein a right half of a casing is cut away and shown.

FIG. 9 is a cross-sectional view illustrating another example of a conventional linear motion rolling guide unit.

FIG. 10 is a plan view of a top seal incorporated in the linear motion rolling guide unit of FIG. 9;

FIG. 11 is a perspective view showing an entire conventional linear motion rolling guide unit.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 track rail 2 casing 3 bottom seal 4 rolling element 5 end cap 6 side seal 8, 9 track groove 11 side wall surface 12 void 13, 13E bottom surface 14 top surface of track rail 16 protrusion 19, 30 top seal 20 plate metal core Reference Signs List 22 lip seal 23 tongue projection 24 projection 25 insertion hole 28 concave groove 35 cutout C central area S side area

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16C 29/04-29/06

Claims (7)

(57) [Claims] 1. A longitudinal sidewall surfaces the raceway grooves formed track rail, the casing raceway grooves in opposition to it and before Ki軌 canal groove capable of relative slide relative track rail are formed respectively, mounting et both longitudinal ends of the casing
The end caps, rolling elements rolling between the track grooves facing, respectively on the outer end surface of the front disappeared command cap
Was end seals, and the linear motion rolling guide unit having arranged top seals the lower surface of the casing opposite to the upper surface of the track rail, the top seal extending along the lower surface of said end cap and said casing A plate-shaped metal core and a lip seal fixed to the plate-shaped metal core and slidably in contact with the upper surface on both sides of the track rail, wherein the plate-shaped metal core has a cutout formed at the center of both ends and and a tongue portion projecting centrally on the lower surface of said end cap insertion hole is formed, said tongue portions
Are formed shorter than both ends of the plate-shaped metal core, and
The sum of the lengths of the raised portions is determined by inserting the tongue-shaped protrusion into the insertion hole.
The length of the insertion hole is longer than twice the sum of the insertion lengths.
Linear whose serial is longer than the total length of insertion of the tongue portion, the tongue portion of the plate-shaped metal core is being inserted so as to be inserted into said insertion hole of said end cap Rolling guide unit. Wherein protruding portions on both sides of the plate-shaped core a notch formed in the metal is formed, the protruding portion is in contact with the side seal, the insertion hole of said end cap said end The linear motion rolling guide unit according to claim 1, wherein the linear motion rolling guide unit is formed on a convex portion protruding from a concave groove formed on a lower surface of the cap. 3. The linear motion rolling guide unit according to claim 2, wherein the notch formed in the plate-shaped cored bar is fitted into the projection of the end cap. 4. The linear motion rolling guide unit according to claim 1, wherein the plate-shaped cored bar is formed of an elastic material. 5. The tongue-shaped protrusion is inserted into the insertion hole by guiding the protrusion of the plate-shaped core metal along the groove of the end cap. The linear motion rolling guide unit according to 1. 6. The linear motion rolling guide unit according to claim 1, wherein the plate-shaped core is formed of a flat plate. 7. The plate-shaped metal core has a central portion where the tongue-shaped protrusions are formed, and is formed in a convex cross-sectional shape that is deflected upward from both sides, and the end cap is disposed at a position deviated from the lower surface. The linear motion rolling guide unit according to claim 1, wherein an insertion hole is formed.