JPH09250541A - Linear motion guiding device with feed screw and its inner block forming method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To try to perform weight saving while stiffness is being kept high, and furthermore facilitate its forming. SOLUTION: Both side surface parts in which a rolling body rolling surface 42 is formed out of the circumferential part of a block main body 31, is formed out of thin wall members 33, the solid part of the block main body 31 is formed out of filling material 33 filling a space between the thin wall members 33, and a feed screw hole 5 and a linear guiding rolling body return hole 43 are filled with the filling material 34. Besides, when the feed screw is made into a ball screw, a ball return hole 63 for the ball screw for circulating balls 6, is provided for the filling material 34 consisting of the solid part of an inner block 31, and ball direction change-over routes 64 for the ball screw, are provided for side closures 32, which guide the balls 6 existing in each loading area between the grooves 61 and 62 for a feed screw shaft 7 and the feed screw hole 5, to the ball return hole 63 for the ball screw.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear motion guide device with a feed screw, which is used in a linear guide portion of various industrial machines such as machine tools, and more particularly to a technique for reducing weight and facilitating molding.

[0002]

2. Description of the Related Art A conventional linear motion guide device of this type is, for example, as shown in FIG. That is,
A pair of side walls 1 provided in parallel with each other with a predetermined space therebetween.
01 and 101, and the track rail 1 inserted between the side walls 101 and 101 of the track rail 100.
00, which is provided so as to be reciprocally movable in the longitudinal direction, and a large number of linear guide rolling elements 103 which are rotatably interposed between the left and right side surfaces of the inner block 102 and the side walls 101, 101 of the track rail 100. And a feed screw shaft 105 screwed into a feed screw hole 104 formed through the inner block 102.

The inner block 102 is a block body 1
06, and side covers 107, 107 attached to both ends of the block body 106 in the axial direction. Then, the rolling element rolling grooves 10 formed on the inner surfaces of the side walls 101, 101 of the track rail 100 on both sides of the block body 106.
Rolling element rolling grooves 109, 10 so as to face 8, 108
9 is formed, and the feed screw hole 104 is formed to penetrate through the central portion of the block body 106, and a straight line that axially penetrates into a solid portion between both side surfaces of the block body 106 and the feed screw hole 104. A guide rolling element return hole 110 is formed.

On the other hand, the side cover 107 has the track rail 1
00 and the rolling element rolling surface 10 of the block body 106 facing each other
A linear guide rolling element direction change path 111 is provided for changing the direction of the rolling element 103 in the load region rolling between 8 and 109 to the linear guide rolling element return hole 110.

[0005]

However, in the case of the above-mentioned prior art, it is necessary to form the screw hole of the feed screw shaft and the rolling element return hole for linear guide in the inner block 102, which is troublesome to process.

Further, there is a problem that the inner block 102 is heavy and the responsiveness at the time of starting and stopping is poor due to inertial force.

The present invention has been made in order to solve the above-mentioned problems of the prior art. The object of the present invention is to reduce the weight while maintaining high rigidity and to facilitate the forming of a feed screw. To provide a linear motion guide device and a method for forming an inner block.

[0008]

In order to achieve the above object, in a linear motion guide device of the present invention, a track rail having a pair of side walls provided in parallel with each other at a predetermined interval, An inner block inserted between the side walls of the track rail so as to be reciprocally movable in the longitudinal direction of the track rail, and a number of linear guides rotatably interposed between the left and right side surfaces of the inner block and the side walls of the track rail. A rolling screw; and a feed screw shaft screwed into a feed screw hole formed through the inner block. The inner block includes a block body and side lids attached to both axial ends of the block body. A rolling element rolling groove is formed on both side surfaces of the block body so as to face the rolling element rolling groove formed on the inner surface of the side wall of the track rail, and the center of the block body is provided. The feed screw holes were formed through, to form a more solid portion linear guide for rolling elements which penetrate axially return hole between the screw hole and the feed sides of the block body,
On the other hand, on the side lid, the rolling elements for linear guides that change the direction of the rolling elements in the load range rolling between the rolling elements rolling surfaces of the track rail and the block body facing each other to the linear guide rolling element return holes In a linear motion guide device with a feed screw having a passage, a thin wall having pressure resistance against a load acting through the rolling element at least both side surfaces of the outer peripheral portion of the block body where the rolling element rolling surface is formed It is characterized in that it is constituted by a race member, the solid part of the block main body is constituted by a filling material filling the space between the thin race members, and the feed screw hole and the linear guide rolling element return hole are formed in the filling material.

A hard material such as steel having pressure resistance is used for the thin race member, and a thermoplastic resin is used as the filler.
Die casting, granite, aluminum (Al) -based light metal or the like is used. Here, the term "granite" itself means granite, but here it is used as a meaning of a structural material in which epoxy resin and crushed stone such as granite are mixed and cast into a mold.

The thin race member may constitute only the left and right side surfaces which form the rolling element rolling surface of the block body, or the cross-sectional shape formed by the left and right side surfaces of the block body and the upper surface portion or the lower surface portion. It may be formed in a V-shape or an inverted U-shape in cross section, or may be a quadrangular closed cross-section structure that surrounds the entire circumference of the left and right side surfaces and the upper and lower surface portions.

If the hollow structural member is molded into a predetermined sectional shape by pulling out the pipe material, the yield is good and the molding can be carried out extremely efficiently.

According to the present invention, since the rolling element rolling surface is formed of the thin race member and the solid portion is formed of the filler, the pressure resistance against the load acting through the rolling element is ensured. The weight can be reduced.

In particular, the thin race member has a U-shaped cross section, an inverted U-shaped cross section, or a closed cross-sectional structure,
The rigidity of the block body can be increased, and a highly rigid yet lightweight block body can be molded. Moreover, the thin lace member is reinforced by the filler, and the rigidity is further increased.

Further, since the feed screw hole of the feed screw and the linear guide rolling element return hole are formed by molding with the filling material, the molding can be easily performed as compared with the case where a hard block is processed as in the conventional case.

The block main body is integrally molded by a mold molding in which a thin lace member is inserted into a mold and filled with a filler.
If the feed screw hole and the linear guide rolling element return hole are formed by die molding, there is no need to post-process the feed screw hole and the linear guide rolling element return hole, and the processing can be extremely simplified.

Further, if the inner circumferential portion of the rolling element direction change path for the linear guide is integrally formed by the filling material, the number of parts can be reduced and the assembling process can be reduced. Since there is no step between the running groove and the inner peripheral portion of the direction changing passage and between the rolling element return hole and the inner peripheral portion of the direction changing passage, a smooth rolling transition of the rolling element can be realized.

Further, along the rolling element rolling groove formed in the thin race member, when the inner block is removed from the raceway rail, the rolling element located in the rolling element rolling groove of the block body is prevented from falling off. It is characterized in that it has a member, and that the holding member is formed of the same material as the filler and is formed integrally with the thin race member.

As described above, if the rolling element holding member is integrally formed with the race member by using the filler, the assembling process can be reduced and the space between the rolling element and the rolling element holding member in the state where the inner block is assembled to the track rail is reduced. The gap can be kept constant, and the interference between the rolling element and the rolling element holding member can be avoided.

The feed screw is a ball screw in which a large number of balls are interposed between the feed screw shaft and the screw groove of the feed screw hole, and the balls are circulated in the filler which constitutes the solid part of the inner block. Ball return hole for ball screw is provided,
The side cover is provided with a ball screw ball direction changing path for guiding balls in a load region between the feed screw shaft and the screw groove of the feed screw hole to the ball screw ball return hole.

As described above, the ball-screw ball-return hole is also provided with the feed screw hole and the linear guide rolling element return hole.
If it is integrally molded with the filler that constitutes the solid portion of the block body, the circulation path of the ball for the ball screw can be easily molded.

Further, if the inner peripheral portion of the ball direction changing passage for the ball screw is also integrally formed by the filler, a step is formed between the inner peripheral portion of the ball direction changing passage for the ball screw and the ball return hole and the female screw groove. Instead, the ball rolls smoothly.

However, the feed screw may be a slide screw in which the threaded portion of the feed screw shaft is in direct sliding contact with the threaded portion of the feed screw hole. In that case, the threaded portion of the feed screw hole should be molded with a filling material. Is preferred.

Further, the feed screw hole may be formed by integrally embedding a cylindrical race member having a thread groove portion in a filling material.

The inner block molding method of the present invention is a mold having a linear convex portion engaging with the rolling element rolling groove of the linear guide rolling element and a core having a core corresponding to the axial hole of the screw shaft. Prepare a thin-walled race member having a linear ball rolling groove and place it in the mold, and press the thin-walled race member against the convex portion of the mold by the filling pressure of the molding material filled in the mold. By pressing and accurately positioning the thin-walled race member in the mold, the relative positional relationship between the feed screw hole of the feed screw shaft and the rolling element rolling groove is set to an accurate positional relationship to form the inner block. It is characterized by being molded.

With this configuration, the positional relationship between the feed screw hole of the inner block and the rolling element rolling groove on the side surface is accurately determined.

A die having a screw core provided with a linear convex portion which engages with the rolling element rolling groove of the linear guide rolling element and a spiral convex portion which engages with the screw groove of the screw shaft is provided. A thin race member is prepared and inserted into the mold, and the linear rolling element rolling groove provided in the thin race member is engaged with the linear convex portion of the mold, while the inner circumference of the cylindrical race member is prepared. Screw-engage with the spiral protrusion on the outer periphery of the screw core in the mold, and press the thin race member against the protrusion of the mold by the filling pressure of the molding material filled in the mold. By accurately locating the position of the thin-walled race member in the It is characterized by molding.

With this arrangement, the position of the inner block can be accurately determined with reference to the rolling element rolling groove of the linear guide rolling element on the side surface.

Further, the thin-walled race member has a mounting surface for a mating member in addition to the side surface where the rolling element rolling groove of the linear guide rolling element is provided, while the die corresponds to the mounting surface. The mounting surface forming part is provided, and the mounting surface of the thin race member is pressed against the mounting surface forming part of the mold by the filling pressure of the molding material, and the relative position between the mounting surface and the rolling element rolling groove of the linear guide rolling element. The feature is that the inner block is molded by accurately determining the relationship.

With this configuration, the positional relationship between the mounting surface of the inner block and the rolling element rolling groove can be accurately determined.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on the illustrated embodiments.

[First Embodiment] FIGS. 1 and 2 show a linear motion guide device with a feed screw according to a first embodiment of the present invention.

This linear motion guide device 1 with a feed screw is
A pair of side walls 2 provided in parallel with each other with a predetermined space therebetween.
Track rails 2 and 1, inner blocks 3 inserted between the side walls 21 and 21 of the track rails 2 so as to be reciprocally movable in the longitudinal direction of the track rails 2, left and right side surfaces of the inner blocks 3, and the track rails. 2 for guiding a large number of linear guide balls 4 as rolling elements for linear guides rotatably interposed between the side walls 21 and 21, and a large number of ball screws for feed screw holes 5 penetratingly formed in the inner block 3. A ball screw shaft 7 as a feed screw shaft screwed through the ball 6 is provided.

The inner block 3 is a block body 3
1 and side covers 32 attached to both ends of the block body 31 in the axial direction.

Ball rolling grooves 42, 42 facing the ball rolling grooves 41, 41 formed on the inner side surfaces of the side walls 21, 21 of the track rail 2 are formed on both side surfaces of the block main body 31. The feed screw hole 5 is formed through the solid portion of the block main body 31, and the linear guide ball return hole 43 axially penetrates through the solid portion between the side surfaces of the block main body 31 and the feed screw hole 5. Are formed.

On the other hand, in the side lid 32, the linear guide balls 4 in the load region rolling between the ball rolling grooves 41 and 42 of the track rail 2 and the block main body 3 facing each other are provided with the linear guide ball return holes 43. To the ball screw ball return hole 63 for the ball screw ball 6 in the load region between the ball screw shaft 7 and the screw grooves 61 and 62 of the feed screw hole 5 and the ball guide shaft outer peripheral portion 44a for linear guide. A ball screw direction changing passage outer peripheral portion 64a for changing direction is provided. On the block body 3 side, in combination with the inner peripheral portions 44a and 64a of the above-described linear guide and ball screw ball direction changing paths, the linear guide and ball screw ball direction changing paths 4 are combined.
There are provided ball guide direction changing path inner peripheral portions 44b and 64b for the linear guide and the ball screw, which constitute 4,46.

At least both side surfaces of the outer peripheral portion of the block body 3 where the rolling element rolling grooves 42 are formed are constituted by a thin race member 33 having pressure resistance against a load acting through the linear guide balls 4. There is. Further, the solid portion of the block body 3 is constituted by the filling material 34 filling the space between the thin race members 33, and the feed screw hole 5, the linear guide ball returning hole 43 and the ball screw ball returning hole 63 are provided in the filling material 34. It is provided.

A cylindrical thread race member 51 having a spiral thread groove 62 formed in its inner periphery is embedded in the feed screw hole 5. This thread race member 51 has a thread groove 6
Although 2 is cut, for example, an extremely thin thin-walled cylinder may be formed into a screw shape by plastic deformation, or the thread race member may be omitted.

A hard material such as steel having pressure resistance is used for the thin race member 33 and the screw race member 51.
The thin race member 33 has a quadrangular closed cross-section structure that surrounds the entire circumference of the left and right side surfaces and the upper and lower surface portions.

A mounting hole 36 for the mating member is formed on the upper surface of the block body 31, but since the thin race member 33 forming the upper surface of the block body 31 is thin, the mounting hole 36 is formed on the thin race member 33. To reach the solid filling material 34. In this example, as shown in FIG. 4C, a threaded insert 37 made of plastic or the like having a threaded hole for a mounting bolt is screwed into a threaded hole 38 previously formed in the thin race member 33, and is formed in this state. Shape and remove the threaded insert 37 after forming. This eliminates the need for threading the mounting hole 36.

However, the thin race member 33 has at least the ball rolling groove 42 in the outer peripheral portion of the block body 31.
It suffices if the left and right side surfaces constituting the
Like the thin-walled race member 332 shown in FIG. 3, it may be a two-member configuration that configures only the left and right side surfaces, or, like the thin-walled race member 331 shown in FIG. As shown in FIG. 3 (c), a U-shaped cross-section that opens upward, or a thin lace member 333 shown in FIG.
It may be formed in an inverted U-shaped cross section that opens downward to form the left and right side surfaces and the upper surface.

The thin race member 33 is preferably formed into a predetermined sectional shape by pulling out the pipe material. By doing so, the yield is good and the molding can be performed extremely efficiently.

On the other hand, the filler 34 is made of thermoplastic resin, die cast, granite, aluminum (Al) type light metal, or the like, and is densely filled in the space between the thin race members 33. The filler 34 can be easily molded by thermoplastic resin molding, die casting, granite casting, or pipe drawing using an Al-based light metal as a core metal.

As described above, the granite is a structural material formed by mixing the epoxy resin and crushed stone such as granite and pouring the mixture into a mold, and has an advantage that damping and thermal deformation are small. . Since the ball in the inner block 2 circulates in an unloaded state, the circulating sound of the ball becomes a problem, and if granite is used, quietness can be improved.

In this embodiment, as the material of the filling material 34, the same resin as the linear guide ball direction change passage inner peripheral portion 44b, the ball screw ball direction change passage inner peripheral portion 64b and the linear guide ball holding member 35 is used. A material is used, and the linear guide ball holding member 35, the linear guide ball direction change passage inner peripheral portion 44b, and the ball screw ball direction change passage inner peripheral portion 64b are integrally formed with the thin race member 33.

Further, when the thin race member 33 is drawn out, instead of filling the filling material 34 by molding,
The material for molding the thin race member 33 is drawn out by using the material for molding the filler 34 as a core metal, the thin race member 33 is molded into a predetermined cross-sectional shape, and the soft filler 34 is made to follow the cross-sectional shape of the thin race member 33. If the pultrusion is plastically deformed and the pultrusion molded article is cut into a predetermined size, the filling material 34 can be filled simultaneously with the pultrusion step. In the case where the core metal is used for the drawing and filling as described above, it is necessary to separately process the linear guide ball return hole 43 and the ball screw ball return hole 63.

In the present invention, since the linear guide ball rolling groove 42 is formed by the thin race member 33 and the solid portion is formed by the filler 34, the linear guide ball 4 is formed.
It is possible to reduce the weight while ensuring the pressure resistance against the load acting through.

In particular, by forming the thin race member 33 into a U-shaped cross section, an inverted U-shaped cross section, or a closed cross-section structure, the rigidity of the block body 31 can be increased, and the highly rigid yet lightweight block body 31 can be molded. . Further, the thin race member 33 is reinforced by the filler 34, so that the rigidity can be further increased.

Further, since the feed screw hole 5 of the feed screw and the ball return hole 43 for linear guide are formed by molding with the filling material 34, molding is easier than in the case of processing into a hard block as in the past. it can.

The block main body 31 is integrally formed by inserting the thin race member 33 into the mold and filling the filling material 34, and the feed screw hole 5 and the linear guide ball return hole 4 are formed.
If 3 is formed by molding, it is not necessary to post-process the feed screw hole 5 and the linear guide ball return hole 43, and the processing can be extremely simple.

Furthermore, the inner peripheral portion 44b of the ball direction changing passage for the linear guide and the inner peripheral portion 6 of the ball direction changing passage for the ball screw.
If 4b is also integrally molded with the filler 34, the number of parts can be reduced and the assembly process can be reduced.
A step between the ball rolling groove 42 and the linear guide ball direction changing path inner peripheral portion 44b and a step between the linear guide ball returning hole 43 and the linear guide ball direction changing path inner peripheral portion 44b due to an assembly error or the like. , There is no step between the screw groove 62 of the feed screw hole 5 and the ball screw ball direction changing passage inner peripheral portion 64b and the step between the ball screw ball return hole 64 and the ball screw ball changing direction passage inner peripheral portion 64b. A smooth rolling transition of the linear guide balls 4 and the ball screw balls 6 can be realized.

Further, if the linear guide ball holding member 35 is integrally molded with the thin race member 33 by the filling material 34, the assembling process can be reduced and the linear guide in the state where the inner block 3 is assembled to the track rail 2 is reduced. The gap between the guide ball 4 and the linear guide ball holding member 35 can be kept constant, and the interference between the linear guide ball 4 and the linear guide ball holding member 35 can be avoided.

Next, a molding method of the inner block 3 will be described with reference to FIG.

First, the thin race member 33 and the cylindrical race member 51 are drawn out and formed into a predetermined shape by press molding or the like. In this embodiment, the thin race member 51
Has a quadrangular cross section, and ball rolling grooves 41, 42 of the linear guide ball 4 extending linearly are formed on the outer peripheries of both side surfaces.

Next, the thin race member 33 and the cylindrical race member 51 are inserted into the mold 200 to perform molding. For molding, various molding methods such as injection molding with molding pressure, transfer molding, die casting, etc. can be applied depending on the molding material.

The mold 200 is composed of a fixed mold 210 and a movable mold 220. The fixed mold 210 has a first fixed mold 211 having an inner hole of a quadrangular cross section that follows the outer peripheral cross sectional shape of the inner block 3. It is composed of a screw core 212 located substantially at the center of the inner hole of the first fixed die 211. Inner side walls 213 facing the inner hole of the first fixed mold 211.
The 213 is provided with linear protrusions 214, 214 that engage with the ball rolling groove 42 of the linear guide ball 4. Further, the screw core 212 is provided with a spiral protrusion 215 that is screwed into the ball screw groove 61. This screw core 212
Is rotatably supported with respect to the first fixed die 211 and is rotationally driven, the molded body is automatically inserted into and released from the fixed die 210 by rotating the screw core 212. be able to. On the other hand, the movable die 220 has a small diameter pin 2 corresponding to the ball return hole 43 of the linear guide ball 4 and the ball return hole 63 of the ball screw ball.
21 and 222 are projected.

The first cavity 201 is provided between the inner circumference of the thin race member 33 and the outer circumference of the cylindrical race member 51, and the linear guide ball holding member 3 is provided on the outer circumference of the side face portion of the thin race member 33.
5, a second cavity 202 for molding 5 and a third cavity 203 for molding the inner peripheral portion 44b of the direction changing path of the linear guide ball 4 on both ends of the side surface of the thin rail member 33 are cylindrical rails. Fourth cavities 204 for molding the inner peripheral portion 64b of the direction change path of the ball 6 for the ball screw are provided at both ends of the member 51.

At the time of insert molding, the thin race member 3
The ball rolling grooves 42 on the both side walls are engaged with the linear convex portions 214 of the first fixed die 211, and the thin race member 33 is positioned in the mold 200 with reference to the ball rolling grooves 42. . Therefore, the center of the cylindrical race member 41 is accurately determined with reference to the ball rolling groove 42. Further, no burr is generated in the ball rolling groove 42.

Moreover, since both side portions of the thin race member 33 are pressed against the linear convex portions 214 on the inner side wall of the first fixed die 211 by the filling pressure of the molding material, the positioning is extremely accurate.

Further, depending on the filling pressure, the thin race member 3
The mounting surface 33b of No. 3 swells and becomes the first fixed mold 21.
Since it is pressed against the first mounting surface forming portion 211b, the mounting surface 33b is also accurately molded with the ball rolling groove 42 as a reference.

Further, the positions of the unloaded ball return hole 43 and the retainer portion 35, and the positions of the inner circumferential portions 44b and 64b of the direction change path are accurately determined with reference to the ball rolling groove 42, so that the ball circulation path is formed. It is possible to accurately set the relative positional relationship among the loaded ball rolling path, the direction changing path, and the unloaded ball return hole that compose the above.

After that, the balls 4 are housed in the circulation path of the linear guide balls 4 of the inner block 3 and the ball circulation path of the ball screw, and the side lid 32 is attached.

FIG. 6 shows a second embodiment of the present invention.

The second embodiment is a case where the feed screw shaft 6 is a slide screw which directly makes sliding contact with the thread portion of the feed screw hole 5. The thread portion of the feed screw hole 5 is directly molded with the filler 34.

Therefore, unlike the first embodiment, the block main body 31 does not have a ball screw ball return hole, a ball screw ball direction changing passage inner peripheral portion, and the side lid also has a ball screw ball. The outer periphery of the turning path is not formed.

Regarding other constitutions and operations,
Since it is completely the same as the embodiment, the same reference numerals are given to the same components and the description thereof will be omitted.

The inner block molding method in this case is as follows.
In FIG. 4, the molding material may be brought into direct contact with the screw core without providing the thread race member 51. Other configurations and operations are exactly the same as those of the molding method shown in FIG.

[0067]

As described above, according to the present invention,
Since the rolling element rolling surface is formed by the thin race member and the solid portion is formed by the filler, it is possible to reduce the weight while ensuring the pressure resistance against the load acting through the rolling element.

In particular, the thin race member has a U-shaped cross section, an inverted U-shaped cross section, or a closed cross section structure,
The rigidity of the block body can be increased, and a highly rigid yet lightweight block body can be molded. Moreover, the thin lace member is reinforced by the filler, and the rigidity is further increased.

Further, since the feed screw hole of the feed screw and the rolling element return hole for linear guide are formed by molding with the filling material, the molding can be facilitated as compared with the case where the conventional hard block is processed.

The block main body is integrally molded by a mold molding in which a thin race member is inserted into a mold and a filler is filled.
If the feed screw hole and the linear guide rolling element return hole are formed by die molding, there is no need to post-process the feed screw hole and the linear guide rolling element return hole, and the processing can be extremely simplified.

Furthermore, if the inner peripheral portion of the linear guide rolling element direction changing path is also integrally formed by the filler, the number of parts can be reduced and the assembling process can be reduced. Since there is no step between the running groove and the inner peripheral portion of the direction changing passage and between the rolling element return hole and the inner peripheral portion of the direction changing passage, a smooth rolling transition of the rolling element can be realized.

Furthermore, if the rolling element holding member for linear guide is integrally formed with the thin race member by the filling material,
The number of assembly steps can be reduced, and the gap between the rolling elements and the rolling element retaining members can be kept constant when the inner block is assembled to the track rails, and interference between the rolling elements and rolling element retaining members can be avoided. it can.

When the feed screw is a ball screw, the filling material forming the solid portion of the inner block is provided with a ball screw ball return hole for circulating the ball, and the side lid has a feed screw shaft and a feed screw hole. If the ball screw ball direction changing path for guiding the balls in the load area between the screw grooves to the ball screw ball return hole is provided, the ball screw ball circulation path can be easily formed.

If the inner peripheral portion of the ball-direction changing passage for the ball screw is also integrally formed with the filling material, a step is formed between the inner peripheral portion of the ball-direction changing passage for the ball screw and the ball return hole and the female screw groove. Instead, the ball rolls smoothly.

Further, by pressing the thin race member against the convex portion of the mold by the filling pressure of the molding material filled in the mold, the thin race member is accurately positioned in the mold. , The relative positional relationship between the shaft hole of the screw shaft and the ball rolling groove is set to an accurate positional relationship. Further, burrs do not occur in the rolling groove of the rolling element, and smooth movement of the rolling element is guaranteed.

Further, when the inner circumference of the cylindrical race member is screwed into the spiral projection on the outer circumference of the core in the mold, the inner block is positioned with reference to the ball rolling groove of the linear guide ball on the side surface. Accurately determined.

Further, if the mounting surface of the thin race member is brought into pressure contact with the mounting surface forming portion of the mold by the filling pressure of the molding material, the relative positional relationship between the mounting surface and the ball rolling groove of the linear guide ball can be accurately measured. Can be decided.

[Brief description of the drawings]

FIG. 1 is a diagram showing a linear motion guide device with a feed screw according to a first embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view of the linear motion guide device with a feed screw in FIG.

FIG. 3 is a view showing another mode of the thin lace member of the block body.

FIG. 4 is a diagram showing a method for molding an inner block of the present invention.

FIG. 5 is a diagram showing a linear motion guide device according to a second embodiment of the present invention.

FIG. 6 is a cross-sectional view of a conventional linear motion guide device with a feed screw.

[Explanation of symbols]

1 Linear motion guide device with feed screw 2 Track rail 21 Side wall 3 Inner block 31 Block body 32 Side lid 33 Thin race member 34 Filling material 35 Linear guide ball holding member 4 Linear guide ball (rolling element) 41, 42 Ball rolling Groove 43 Linear guide ball return hole 44a, 44b Linear guide ball direction change path outer peripheral portion,
Inner peripheral portion 5 Feed screw hole 51 Screw race member 6 Ball screw ball 61, 62 Screw groove 63 Ball screw ball return hole 64a, 64b Ball screw ball direction change path outer peripheral portion, inner peripheral portion 7 Ball screw shaft

Claims (11)

[Claims] 1. A track rail having a pair of side walls provided in parallel with each other at a predetermined interval, and an inner block inserted between the side walls of the track rail and reciprocally movable in the longitudinal direction of the track rail. A large number of linear guide rolling elements which are rotatably interposed between the left and right side surfaces of the inner block and the side walls of the track rail, and a feed screw shaft screwed into a feed screw hole penetratingly formed in the inner block. The inner block includes a block body and side lids attached to both ends in the axial direction of the block body, and the rolling elements formed on the inner side surfaces of the side walls of the track rail on both side surfaces of the block body. The rolling element rolling groove is formed so as to face the rolling groove, and the feed screw hole is formed through the solid portion of the block main body, and further, both side surfaces of the block main body and the feed screw hole are formed. A rolling element return hole for linear guide that penetrates in the axial direction is formed on the side of the rail. In a linear motion guide device with a feed screw, which is provided with an outer peripheral portion of a linear guide rolling element turning path for changing direction to a rolling element return hole for guiding, a rolling element rolling surface is formed at least in an outer peripheral portion of the block body. Both side surface parts are made of thin thin race members, the solid part of the block body is made of a filling material filling the space between the thin race members, and the feed screw hole and the rolling element return hole for linear guide are formed in the filling material. A linear motion guide device with a feed screw. 2. A block main body is integrally formed by die molding in which a thin lace member is inserted into a die and a filler is filled therein.
The linear movement guide device with a feed screw according to claim 1, wherein the feed screw hole and the rolling element return hole for linear movement are formed by molding. 3. The linear motion guide device with a feed screw according to claim 1, wherein the inner peripheral portion of the rolling element direction changing passage is formed of a filler. 4. A holding member for preventing a rolling element located in the rolling element rolling groove of the block body from falling off when the inner block is removed from the track rail along the rolling element rolling groove formed in the thin race member. 4. The linear motion guide device with a feed screw according to claim 1, further comprising a member, wherein the holding member is formed of the same material as the filler and is integrally formed with a thin race member. 5. The feed screw is a ball screw in which a large number of balls are interposed between a feed screw shaft and a screw groove of a feed screw hole, and the balls are circulated in a filler material forming a solid part of the inner block. Ball return hole for ball screw for
4. A ball screw ball direction changing path for guiding a ball in a load area between the feed screw shaft and the screw groove of the feed screw hole to the ball screw ball return hole on the side lid.
Alternatively, the linear motion guide device with a feed screw described in 4 above. 6. The linear movement guide device with a feed screw according to claim 5, wherein the inner peripheral portion of the ball direction changing passage for the ball screw is formed of a filler. 7. The feed screw is a slide screw in which the screw portion of the feed screw shaft is in direct sliding contact with the screw portion of the feed screw hole,
The linear motion guide device with a feed screw according to claim 1, 2, 3 or 4, wherein the thread portion of the feed screw hole is formed of a filler. 8. A straight line with a feed screw according to claim 1, 2, 3, 4, 5, or 6, wherein a cylindrical race member for forming the feed screw hole to form a thread groove is integrally embedded in the filler. Exercise guidance device. 9. A die having a linear convex portion engaging with a ball rolling groove of a linear guide ball and a core corresponding to a shaft hole of a feed screw shaft is prepared, and the linear ball rolling groove is The formed thin-walled race member is placed in the mold, and the thin-walled race member is pressed against the convex portion of the mold by the filling pressure of the molding material filled in the mold, and the thin-walled race member in the mold By accurately positioning the position of the feed screw shaft, the inner block is molded by setting the relative positional relationship between the feed screw shaft hole and the rolling element rolling groove to an accurate positional relationship. Inner block molding method for linear motion guide device. 10. A mold having a screw core provided with a linear convex portion that engages with a rolling element rolling groove of a linear guide rolling element and a spiral convex portion that engages with a screw groove of a feed screw shaft. , A thin race member is inserted into the mold, and a linear rolling element rolling groove provided in the thin race member is engaged with a linear convex portion of the mold. The periphery is screw-engaged with the spiral protrusion on the outer periphery of the screw core in the mold, and the thin race member is pressed against the protrusion of the mold by the filling pressure of the molding material filled in the mold, By accurately positioning the thin race member inside the inner race block, the relative positional relationship among the cylindrical race member with which the screw shaft is screwed, the thin race member, and the rolling element rolling groove is set to an accurate positional relationship. Inner block of linear motion guide device with feed screw characterized by molding The method of molding. 11. A thin race member has a mounting surface for a mating member in addition to a side surface where a rolling element rolling groove of a linear guide rolling element is provided, and a die corresponds to the mounting surface. The mounting surface forming part is provided, and the mounting surface of the thin race member is pressed against the mounting surface forming part of the mold by the filling pressure of the molding material, and the relative position between the mounting surface and the rolling element rolling groove of the linear guide rolling element. The linear motion guide device with a feed screw according to claim 9 or 10, wherein the inner block is molded by accurately determining the relationship.