JP3203115B2 - 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 which is applied to various devices such as a machine tool, a precision machining device, and a test device, and in which a slider reciprocates on a track rail.

[0002]

2. Description of the Related Art Conventionally, there is a linear motion rolling guide unit disclosed in Japanese Patent Application Laid-Open No. 5-138428. The linear motion rolling guide unit will be described with reference to FIGS. FIG. 3 is a partially cutaway perspective view showing an example of a conventional linear motion rolling guide unit, and FIG. 4 is a front view of an end cap incorporated in the linear motion rolling guide unit of FIG.

In the conventional linear motion rolling guide unit, track grooves 5 are formed on both side wall surfaces 22 in the longitudinal direction of the track rail 2, and the slider 1 is laid on the track rail 2 so as to be able to reciprocate. As will be described later, a plurality of mounting holes 15 are formed in the track rail 2 at intervals in the longitudinal direction. Bolts are inserted into these mounting holes 15, and the track rails 2 are fixed to bases 20 such as a bed, a machine stand, and a working table by the bolts. An embedding plug 13 is fitted into the upper part of the mounting hole 15 so that dust, moisture and the like do not enter after the bolt is inserted.

[0004] The slider 1 is relatively movable with respect to the track rail 2 and each of the track grooves 5 of the track rail 2.
The casing 3 has a raceway groove 9 formed at a position facing the raceway 5, a plurality of rolling elements 7 such as balls rolling between the raceway grooves 5 and 9, and end caps 6 attached to both ends of the casing 3, respectively. are doing. A plurality of screw holes 34 for mounting the slide table 4 are formed in an upper portion of the casing 3. Rail insertion recesses 10 are respectively formed on the lower surfaces of the casing 3 and the end cap 6 so that the casing 3 and the end cap 6 move across the track rail 2. Further, in order to prevent the rolling elements 7 from falling off the casing 3, the casing 3 is so arranged that the holding band 18 surrounds the many rolling elements 7.
And a lower surface seal 8 is mounted on the lower surface of the slider 1 to achieve a seal between the track rail 2 and the lower end of the casing 3.

As shown in FIG. 4, the end cap 6 has a raceway groove 39 on which the rolling element 7 forms a sliding surface with the track rail 2 and a direction in which the rolling element 7 is oriented for circulation of the rolling element 7. A turning path 11 for turning is formed on both sides. Further, as shown in FIG. 3, a side seal 17 for achieving a seal between the track rail 2 and both ends in the longitudinal direction of the slider 1 is attached to the end cap 6, and a side seal 17 between the track rail 2 and the slider 1 is provided. A grease nipple 30 for supplying a lubricant to the sliding surface of is mounted. The end cap 6 has a plurality of mounting holes 31.
It is attached to both end surfaces of the casing 3 by screws 32 and the like penetrating the casing 3.

The linear motion rolling guide unit is configured as described above, and the slider 1 is mounted on the track rail 2 in a state of straddling the track rail 2, and a plurality of rollers circulating along the track groove 5 of the track rail 2. It slides freely with the interposition of the moving body 7. The rolling elements 7 in the load area running in the track groove 5 of the track rail 2 are guided to a direction change path 11 formed in the end cap 6 shown in FIG. Return hole 12 formed
And the rolling elements 7 circulate infinitely in an infinite circulation path. As described above, the rolling of the loaded rolling element 7 located between the raceway groove 9 formed on the slider 1 and the raceway groove 5 formed on the track rail 2 causes the track rail 2 and the slider 1 to move relative to each other. I can exercise.

FIG. 5 is a perspective view showing an example of use of a conventional linear motion rolling guide unit. In FIG. 5, components having the same purposes as those in FIGS. 3 and 4 are denoted by the same reference numerals. As shown in FIG. 5, the linear motion rolling guide unit is
0, the track rails 2 are fixed in two rows in parallel, a plurality of slide units or sliders 1 are straddled on each track rail 2, and the slide table 4 is fixed on the sliders 1 and placed on the slide table 4. This makes the relatively heavy devices move forward and backward with high precision over a relatively long distance.

In the linear motion rolling guide unit shown in FIG. 5, each track and the rolling element
Since it is necessary to support a radial load and a moment load in each of the left and right directions, the engagement is performed in a state where the internal clearance is zero or a preload is applied. Since this linear motion rolling guide unit has the above configuration, if there is an error in the parallelism of the track rail 2, the load applied when the slider 1 slides increases, the service life of the guide unit decreases, and the sliding resistance decreases. Changes, etc., resulting in significant effects on accuracy and performance. For this reason, not only the number of assembling steps for improving the accuracy of the parallelism of the track rail 2 is remarkably increased, but also the high accuracy of several tens μm or less over the entire length of the track rail 2 having a length of several meters. Fixing the track rails 2 in parallel is a difficult task almost impossible to cope with.

The track rail 2 shown in FIG. 3 has a mounting hole 15 penetrating from the upper surface 19 to the lower surface for use in fixing to the base 20. As shown in FIG. 6, the mounting hole 15 has a head hole 26 into which the head 36 of the bolt 16 formed on the track rail 2 is fitted.
Bolt 1 formed concentrically below head hole 26
And a small-diameter hole 25 into which the sixth shank 35 is inserted. The mounting hole 15 is used when the track rail 2 is polished. That is, as shown in FIG. 8, the track rail 2 is
The bolt 16 inserted in 5 is screwed into a screw hole 33 formed in the processing table 37, and is fixed to the processing table 37. The track rail 2 fixed to the processing table 37 includes grinding wheels 38 disposed above the track rail 2 and on both sides in the longitudinal direction.
As a result, the upper surface 19 of the track rail 2 and the longitudinal side walls 22 are completely polished at once.

[0010] When the track rail 2 is fixed to the bed 20, as shown in FIG.
A screw hole 21 formed in the base 20 with the mounting hole 15
Then, the bolt 16 is inserted into the mounting hole 15 from above and screwed into the screw hole 21 to be fixed to the base 20. In this case, a bolt 16 inserted into a mounting hole 15 formed in the track rail 2 is
Is fixed, above the head upper surface of the bolt 16,
Since the remaining concave portion of the mounting hole 15 is formed, as shown in FIGS. 3 and 7, the plugs 13 and 23 are embedded in the concave portion.

A mounting hole 15 formed in the track rail 2
As a means for embedding the plug 13 in the concave portion, conventionally, a filling material such as a resin material, a copper material, an aluminum alloy material or the like is filled in the concave portion, or as disclosed in JP-A-5-138428. The molded plug 23 with the air vent hole 29 is fitted into a recess formed above the mounting hole 15 (see FIG. 7). Further, the plug 23 provided as described above is used.
When the upper surface of the plug 23 projects from the upper surface 19 of the track rail 2, the projecting portion of the plug 23 is ground so that the upper surface of the plug 23 is flush with the upper surface 19 of the track rail 2.

[0012]

However, recently, as described above, the bolt 16
To fix the track rail 2 to the base 20 (hereinafter, referred to as an upper mounting type), as well as an attaching method to fix the track rail 2 to the base 20 by inserting bolts from the base 20 side. Demands for lower mounting) have increased. As a countermeasure to meet the demand, there is a method of forming a female screw for screwing a bolt below the track rail 2 and screwing the bolt 16 from the base 20 side to the female screw to fix the track rail 2 to the base 20. Conceivable. However, in such a configuration, it is necessary to separately provide a means for fixing the track rail 2 to a base such as the worktable 37 when the above-described surface such as the track groove and the upper surface of the track rail 2 is entirely polished. Problems arise.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, and is used for fixing a track rail to a base when polishing a track groove, an upper surface, and the like of a track rail, and also, the upper surface of the track rail. In the upper mounting type used to fix the track rail to the base by inserting bolts from the upper side, it can be shared with the lower mounting type only by forming a plug hole and a mounting screw. An object of the present invention is to provide a linear motion rolling guide unit capable of securing strength and reducing costs.

[0014]

The present invention is configured as follows to achieve the above object. That is,
The present invention is directed to a track rail having a plurality of mounting holes penetrated vertically and fixed in a longitudinal direction to be fixed to a base and track grooves formed on both side surfaces in a longitudinal direction, and opposed to the track grooves. A slider having a raceway groove and end caps attached to both end surfaces of the casing, and having a slider that reciprocates across the track rail, and a rolling element that rolls between the raceway grooves. In the linear motion rolling guide unit, the mounting hole is a shank hole in which a bolt shank is inserted, a head hole in which a head of the bolt is arranged, and an plug formed in an upper end of the head hole. The shank hole is formed with a mounting screw, and the diameter of the plug hole is larger than the diameter of the head hole. A support surface for the plug is formed, and an upper surface of the plug is formed in the same plane as an upper surface of the track rail in a state of being disposed in the plug hole. The present invention relates to a rolling guide unit.

In this linear motion rolling guide unit, the plug is made of an aluminum alloy.

In this linear motion rolling guide unit, the plug hole in the mounting hole is formed to be shallower than the head hole.

In this linear motion rolling guide unit, when the track rail is mounted on the base by inserting the bolt from the upper surface of the track rail into the mounting hole, the diameter of the screw of the bolt is the shank. The diameter of the mounting hole is smaller than the diameter of the mounting screw.

In this linear motion rolling guide unit, when the bolt is inserted from the base side and the track rail is attached to the base, the screw of the bolt is the mounting screw of the shank hole. It is screwed into.

[0019]

The linear motion rolling guide unit according to the present invention is constructed as described above and operates as follows. That is, the linear motion rolling guide unit includes a mounting hole for mounting the track rail to the base, a shank hole into which the bolt shank is inserted, a head hole in which the head of the bolt is disposed, and the head hole. It is composed of an embedding hole in which an embedding formed at the upper end of the section is arranged, and a mounting screw is formed in the shank hole. When the track rail is mounted on a base such as a worktable, a bolt smaller than the diameter of the mounting screw can be inserted into the mounting hole from the upper surface side of the track rail to fix the track rail to the base. In a state where the track rail is fixed to the base, the grindstones disposed above and on both sides in the longitudinal direction of the track rail can perform the total polishing of the upper surface and the both side walls in the longitudinal direction of the track rail at one time.

Further, after the track rail is completely polished, the track rail is mounted on the base such as a bed or a machine base by inserting the bolt from the upper surface of the track rail into the mounting hole. The track rail can be fixed to the base by screwing the bolt into a screw formed in the base.
Alternatively, when the track rail is attached to the base by inserting the bolt from the base side, the screw of the bolt is screwed into the attachment screw of the shank hole, thereby attaching the track rail. It can be fixed to the base. That is, when the track rail is mounted on the base, the linear motion rolling guide unit can be compatible with either a lower mounting type or an upper mounting type.

Further, the diameter of the plug hole is formed to be larger than the diameter of the head hole to form a support surface for the plug, and the plug is disposed in the plug hole. Therefore, even if the track rail is fixed to the base by an upper mounting type or a lower mounting type, the plug can be reliably and stably arranged in the plug hole of the track rail. Further, the track rail, the plug is embedded in the plug hole, the track rail and the upper surface of the plug can be ground if necessary, the upper surface of the plug and the upper surface of the track rail. Since the same surface can be ground, no foreign matter such as dust or dust accumulates in the mounting hole, and when the slider is mounted on the track rail, the sealing performance between the track rail and the side seal is improved. Can be done.

[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 FIG. FIG. 1 is a sectional view showing an embodiment of a linear motion rolling guide unit according to the present invention. This linear motion rolling guide unit is shown in FIGS.
5 has basically the same configuration as the conventional linear motion rolling guide unit shown in FIG. 5, parts having the same functions as the parts shown in FIGS. are doing.

The linear motion rolling guide unit includes a shank hole 25 of a mounting hole 15 through which a bolt (not shown) for fixing the track rail 2 to the base 20 is inserted, and a head hole of the mounting hole 15. Plug 1 formed on the upper part of the part 26
3 is characterized by the plug hole 27 for press-fitting 3 and the plug 13. As shown in FIG. 3, the linear motion rolling guide unit has a track rail 2 provided with a track groove 5 on both side walls 22 in the longitudinal direction, and the track rail 2 extends over the track rail 2. It comprises a slidable slider 1. The slider 1 in this linear motion rolling guide unit has a casing 3 having a track groove 9 formed at a position opposing the track groove 5 of the track rail 2 and a space between the opposing track grooves 5 and 9 as shown in FIG. It has a number of rolling members 7 such as balls that can roll and move relatively, and end caps 6 attached to both ends of the casing 3 in the sliding direction, that is, in the longitudinal direction.
It has a side seal 17 and a bottom seal 8 for achieving a seal between the casing and the casing 3.

The linear motion rolling guide unit has a mounting hole 15 penetrating from the upper surface 19 to the lower surface of the track rail 2. As shown in FIG.
The holes having different inner diameters are formed so that the holes are concentric and lower in diameter. That is, a shank hole 25 having the smallest diameter is formed at the lowermost side of the mounting hole 15, and a base for fixing the track rail 2 to the base 20 by the lower mounting type is formed on the inner surface of the shank hole 25. A female screw, that is, a mounting screw 28 with which the bolt 16 inserted from the side 20 is screwed is formed. A head hole 26 is formed above the shank hole 25. The track rail 2 is fixed to the processing table 37 (FIG. 8) in the head hole 26 when the track rail 2 is completely polished. For this purpose, the head 36 of the bolt 16 inserted from above the track rail 2 is fitted.

An embedding hole 27 is formed at the upper end of the head hole 26, and the hole diameter of the embedding hole 27 is formed larger than the hole diameter of the head hole 26. Moreover, a step formed at the boundary between the plug hole 27 and the head hole 26 is formed on the support surface 40 of the plug 13. A step formed at the boundary between the head hole 26 and the shank hole 25 is formed on the support surface 42 of the bolt head. The plug 13 is press-fitted into the plug hole 27 and closed. As shown in FIG. 1, the depth of each of the shank hole 25, the head hole 26, and the plug hole 27 in the mounting hole 15 is formed such that the hole having a smaller diameter becomes deeper. .

In this linear motion rolling guide unit, when a bolt is inserted into the mounting hole 15 from the upper surface 19 of the track rail 2 and the track rail 2 is fixed to the base 20, an upper mounting type is adopted. By using a screw having a diameter smaller than the diameter of the mounting screw 28 in the shank hole 25, a bolt can be inserted into the shank hole 25 and the bolt is screwed into a screw formed in the base 20. Thus, the track rail 2 can be fixed to the base 20. When the track rail 2 is fixed to the base 20 by inserting a bolt from the side of the base 20, the bolt may be screwed into the mounting screw 28 of the shank hole 25. By using this, the track rail 2 can be fixed to the base 20 by inserting a bolt from the base 20 side and screwing the bolt into the mounting screw 28 of the shank hole 25.

The plug 13 shown in FIG. 1 is a plate-like body having a diameter slightly larger than the inner diameter of the plug hole 27 to be press-fitted and having an interference. It has the same thickness or a slightly thicker shape. The material of the plug 13 may be the same material as the casing, an aluminum alloy, brass, copper, resin, rubber, etc., but the fact that the plug 13 is made of an aluminum alloy is excellent in cost and durability. Is most preferred. After the plug 13 is pressed into the plug hole 27, the upper surface 19 of the track rail 2 and the upper surface 41 of the plug 13 are arranged so that the upper surface of the plug 13 is flush with the upper surface 19 of the track rail 2. Is ground and polished.

Referring to FIG. 2, another embodiment of the linear motion rolling guide unit according to the present invention will be described. FIG. 2 is a cross-sectional view showing a track rail in which a mounting hole for fixing the track rail 2 to the base 20 is formed. The track rail shown in FIG. 2 has the same configuration as the track rail shown in the embodiment of FIG. 1 except that the depth of the plug hole 27 and the shape of the plug 23 are different. Are denoted by the same reference numerals. In this embodiment, the plug hole 2 shown in FIG.
7 is formed deeper than the plug hole 27 shown in FIG. 1, and the plug 23 has an annular leg 24 formed around the plate-like body. Since the plug hole 27 is formed deeply and the annular leg 24 is provided around the plug 23, the contact area between the plug 23 and the inner surface of the plug hole 27 increases, so that vibration Plug 2 press-fitted into the plug hole 27 due to reasons such as
There is no fear that the protrusion 3 will protrude above the track rail 2 from the plug hole 27.

Although not shown, the plugs 13, 23
The wall surfaces of the plugs 13 and 23 may be formed in a tapered surface so that the plugs 13 are easily press-fitted, and the wall surface of the plug hole 27 may be formed in a tapered shape corresponding to the tapered surface. Alternatively, the periphery of the plug 13 on the side where the plug 13 is pressed into the plug hole 27 may be rounded or tapered to facilitate press-fitting the plug 13 into the plug hole 27.

In the linear motion rolling guide unit according to the present invention, the method of fixing the track rail 2 to the base 20 by using the mounting screw 28 formed in the shank hole 25 of the track rail 2 in the upper mounting type is described below. This is the same as the case where the rail 2 is attached to the processing table 37. After fixing the bolt to the base 20, the plug holes 13 and 23 are press-fitted into the plug hole 27 so as to press-fit the plug holes 13 and 23 above the head of the bolt. , The upper surface 41 of the plugs 13 and 23
Grinding may be performed so as to be flush with the upper surface 19.

Further, the track rail 2 in the linear motion rolling guide unit can be fixed to the base 20 by a lower mounting type. At this time, the plugs 13 and 23 are preliminarily embedded in the plug hole 27 at a factory or the like.
The upper surface 41 of the track rail 23 can be ground so as to be flush with the upper surface 19 of the track rail 2. The track rail 2 in this state is arranged on the base 20, a bolt is inserted from the base 20 side using a screw 28 formed in the shank hole 25, and the bolt screw is attached to the mounting screw 28.
It can be attached by screwing into. Alternatively, the track rail 2 can be fixed to the base 20 by a lower mounting type without using the mounting screws 28 formed in the shank hole 25. For example, although not shown, the head hole 26 is formed in a non-circular shape, the nut mounted in the head hole 26 is prevented from rotating, and a bolt inserted from the base 20 into the shank hole 25 is connected to the nut. , The track rail 2 can be fixed to the base 20 in a bottom-mounting manner.

[0032]

The linear motion rolling guide unit according to the present invention is configured as described above and has the following effects. That is, in this linear motion rolling guide unit, a mounting screw is formed on an inner surface of a shank hole of a mounting hole formed in a track rail, and an embedding hole is formed at an upper end of a head hole of the mounting hole. Therefore, the track rail can be fixed to the base by either the upper mounting type or the lower mounting type, and the track groove of the track rail,
Even when grinding the upper surface or the like, the track rail can be fixed to the processing table by using the mounting screws formed in the mounting holes.

That is, in the case of the upper mounting type, the track rail is attached to the base by using the bolt having a screw diameter smaller than that of the mounting screw in the shank hole. The track rail can be screwed into the screw of the base and fixed by inserting the bolt into the mounting hole from above. Further, in the case of the lower mounting type, the bolt is inserted from the base side using the bolt having a screw screwed to the mounting screw of the shank hole, and the bolt is used for the shank. It can be screwed and fixed to the mounting screw in the hole.

In addition, the rail of the linear motion rolling guide unit can grind and polish the upper surfaces of the track rail and the plug as required after the plug is pressed into the press-fitting portion. The upper surface of the plug can be flush with the upper surface of the track rail, and a good sealing state can be secured between the upper surface of the track rail and a side seal provided on a slider, and Since there is no step on the upper surface of the track rail, foreign matter such as cutting chips falling on the upper surface of the track rail does not enter the slider. Further, when the plug is made of an aluminum alloy, there is no step on the upper surface of the track rail,
The sliding characteristics of the side seal of the slider with the rubber seal member are good, the wear resistance of the side seal can be improved, and the life can be extended.

Conventionally, since the plug is buried in the remaining recess of the mounting hole formed above the head upper surface of the bolt inserted into the mounting hole of the track rail, the depth of the recess is not constant. In the rolling guide unit, the plug hole is formed at the upper end of the head hole of the mounting hole,
Since the plug is configured to be pressed into the plug hole, the dimensions of the plug hole and the plug can be easily measured, and the plug can be securely inserted into the plug hole. Can be set firmly.

In this linear motion rolling guide unit,
A female screw is formed on the inner surface of the shank hole of the mounting hole of the existing track rail, and a plug hole is formed at the upper end of the head hole of the mounting hole, and the plug hole is embedded in the plug hole. Since the above effects can be achieved by press-fitting the stopper, the conventional linear motion rolling guide unit can also be configured such that the track rail can be mounted on the lower side with a simple configuration change.

[Brief description of the drawings]

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

FIG. 2 is a sectional view showing another embodiment of the track rail in the linear motion rolling guide unit according to the present invention.

FIG. 3 is a partially broken perspective view showing a conventional linear motion rolling guide unit.

FIG. 4 is a front view showing an end cap of the linear motion rolling guide unit of FIG. 3;

FIG. 5 is a perspective view showing an example of a conventional linear motion rolling guide unit.

FIG. 6 is a sectional view showing an example of a track rail in a conventional linear motion rolling guide unit.

FIG. 7 is a cross-sectional view showing an example of a plug in a conventional linear motion rolling guide unit.

FIG. 8 is a sectional view showing an example of a polishing method for polishing a rail of a conventional linear motion rolling guide unit.

[Explanation of symbols]

 Reference Signs List 1 slider 2 track rail 3 casing 5, 9 raceway groove 6 end cap 7 rolling element 13, 23 plug 15 mounting hole 19 upper surface of track rail 20 base 22 longitudinal side wall surface 24 annular leg of plug 25 shank hole 26 hole for head 27 hole for plug 28 screw 38 whetstone

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-60129 (JP, A) JP-A-1-98920 (JP, U) JP-A-59-116401 (JP, U) JP-A-4- 117914 (JP, U) JP-A-2-105608 (JP, U) JP-A 1-150218 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16C 29/00-31 / 06

Claims (5)

(57) [Claims] 1. A track rail having track grooves formed on both sides in a longitudinal direction and a plurality of mounting holes penetrating in a vertical direction and fixed in a longitudinal direction for fixing to a base. A slider having a casing provided with opposed track grooves and end caps attached to both end faces of the casing and reciprocating across the track rail, and a rolling element rolling between the track grooves. In the linear motion rolling guide unit, the mounting hole has a shank hole into which a shank of a bolt is inserted, a head hole in which a head of the bolt is arranged, and a filling hole formed at an upper end of the head hole. The plug is configured with an embedding hole portion, a mounting screw is formed in the shank hole portion, and the diameter of the embedding hole portion is larger than the diameter of the head hole portion. form And a support surface for the plug is formed, and an upper surface of the plug is formed in the same plane as an upper surface of the track rail in a state of being disposed in the plug hole. Dynamic rolling guide unit. 2. The linear motion rolling guide unit according to claim 1, wherein the plug is made of an aluminum alloy. 3. The linear motion rolling guide unit according to claim 1, wherein the plug hole in the mounting hole is formed to be shallower than the head hole. 4. When the track rail is mounted on the base by inserting the bolt from the upper surface of the track rail into the mounting hole, the diameter of the screw of the bolt is the mounting screw of the shank hole. The linear motion rolling guide unit according to claim 1, wherein the diameter is smaller than the diameter of the linear motion rolling guide unit. 5. When the track rail is mounted on the base by inserting the bolt from the base side, a screw of the bolt is screwed into the mounting screw of the shank hole. The linear motion rolling guide unit according to claim 1, wherein