JPH1047345A - Direct acting block - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive direct acting block without generating noise and needing no oil supply. SOLUTION: In an inner part upper surface 106 of a direct acting block 1, a slide member 2 integrally formed with a holder 3 is firmly bonded, and a protruded plane of the slide member 2 is protruded downward to be placed horizonally. Similarly, in an inner part left side surface 102 and an inner part right side surface 103, the slide member 2 integrally formed with the holder 3 is firmly bonded, the protruded plane of the slide member 2 is protruded in an inner part surface direction. The slide member 2 is manufactured of a carbon fiber dispersed resin or carbon fiber dispersed porous ceramics. A slide surface of the slide member is slid into direct contact with a running surface of a direct acting guide rail.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear motion block which is guided by a linear motion guide rail and linearly moves.

[0002] The linear guide rail has a substantially rectangular cross section and is an elongated member. The linear drive block according to the present invention has an inverted U-shaped cross section and extends over both side surfaces and the upper surface of the linear guide rail. Traveling straight in the longitudinal direction, so-called L
An M linear guide rail and an LM linear block.

[0003]

2. Description of the Related Art FIG. 8 is a perspective view including a partial cross section of a conventional LM linear guide rail and LM linear block. FIG.
FIG. 2 is a sectional view of a conventional LM linear motion block.

The LM linear motion block 32 has an inverted U-shaped cross section, and has side portions 322 and 323 extending downward from the left and right ends of the upper portion 321 at right angles, respectively.

A ball bearing running groove 331 having a semicircular cross section is provided at an inner corner at the boundary between the upper portion 321 and the left side portion 322.
A circular ball bearing travel hole 335 is bored inside the LM linear motion block 32 in the upper left direction of the ball bearing travel groove 331. At both ends (not shown) of the ball bearing travel groove 331, It is connected to both ends (not shown) of the ball bearing running hole 335 and forms a circulation path through which the ball bearing runs. Similarly, a ball bearing running groove 333 is formed in an inner corner at a boundary between the upper portion 321 and the right side portion 323, and a ball bearing running hole 337 is bored in the upper right direction.

A ball bearing running groove 332 having a semicircular cross section is formed at an inner corner of the boundary between the jaw 328 below the left side 322 and the side 322. A circular ball bearing running hole 336 is bored in the lower left direction. Both ends (not shown) of the ball bearing running groove 332 are respectively connected to both ends (not shown) of the ball bearing running hole 336 to form a circulation path through which the ball bearing runs. Similarly, the right side 323
A ball bearing running groove 334 is formed in an inner corner at a boundary between the ball bearing and the jaw portion 329, and a ball bearing running hole 338 is formed in a lower right direction inside thereof.

[0007] Before and after the LM linear motion block,
An end block 6 in which a return path connecting the ball bearing running groove and the ball bearing running hole is formed is disposed. A large number of ball bearings 5 are connected to the ball bearing running groove, the ball bearing running hole and the return path with almost no gap, and are pressed against each other,
Circulate. A dust-prevention plate 7 made of a flexible material such as rubber or plastics is disposed on the surface of the end block 6.
It is screwed to 2. The dust blocking plate 7 prevents dust from entering between the LM translation block 32 and the LM translation guide rail 41.

On the other hand, the LM linear guide rail 41 has a substantially rectangular cross section, and a constriction is formed continuously at the center of the left and right side surfaces. Further, ball bearing running grooves 415 and 417 having a semicircular cross section are formed continuously at the boundary between the upper surface and the left and right side surfaces, respectively. Further, ball bearing running grooves 416 and 418 each having a semicircular cross section are formed continuously in the upper jaw.

Then, as shown in FIG. 8, the LM linear motion block 32 straddles both side surfaces and the upper surface of the LM linear motion guide rail 41, and linearly moves in the longitudinal direction via the ball bearing 5. The LM translation block 32 and the LM translation guide rail 41 slide via the ball bearing 5 without contact.

[0010]

However, since a large number of ball bearings are interposed between the conventional linear motion block and the linear motion guide rail, they roll and push each other to run and circulate. The bearing running hole and return path must be precisely drilled in the linear motion block.Furthermore, after machining, the ball bearing must be circulated for a predetermined period of time to allow the ball bearing and its circulation path to fit together. There is a problem that the cost of the moving block is high. Secondly, there is a problem that, due to a small amount of dust, rust, breakage, or abrasion, the ball bearings may not be smoothly circulated due to the use of the ball bearings, or aging may easily occur. Third, there is a problem that noise is generated as the ball bearing travels. Fourth, there is a problem that when the ball bearing runs continuously, heat of abrasion is generated and the temperature rises in a short time. Fifth, when the ball bearing runs, there is a problem that metal powder is generated due to abrasion and the linear motion guide rail becomes dirty. Further, there is a problem that the allowable dimensional range of the linear motion block, the linear motion guide rail, and the ball bearing and the assembly clearance range thereof are extremely narrow, the occurrence rate of assembly failure is high, and the yield is poor.

Therefore, the present invention solves the above problems,
An object of the present invention is to provide an inexpensive linear motion block that does not generate noise, does not require refueling, and is inexpensive.

[0012]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a linear motion block according to the present invention, namely, a linear motion block having a substantially C-shaped cross section. A plate-shaped sliding member made of carbon fiber-dispersed resin or carbon fiber-dispersed porous ceramic is attached to the surface, and the sliding surface of the sliding member and the guide surface of the guide rail contact and slide. Achieved by the characteristic linear motion block.

In a preferred embodiment of the present invention, a large number of columnar projections are provided on the surface of the sliding member, and the upper surface of the columnar projection serves as a sliding surface. ing.

In another preferred embodiment of the present invention, the sliding member is provided with a plurality of frusto-conical protrusions on the surface thereof, and the upper portion of the frusto-conical protrusion is provided. The bottom surface of the small circle is a sliding surface.

In still another preferred embodiment of the present invention, the sliding member is provided with a large number of cylindrical projections with dimples on the surface of the sliding member. A portion of the upper bottom surface other than the concave portion is a sliding surface.

[0016]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a view showing an embodiment of a linear motion block according to the present invention. FIG. 1 (a) is a plan view and FIG. 1 (b) is a front view.

The linear motion block 1 has a C-shaped cross section.
The central part is arranged horizontally, and both sides are suspended and used. The inner upper surface 106 is parallel to the upper surface 101 and forms the bottom surface of the rectangular groove. Internal side 105, 1
07 is inclined with respect to the vertical line, and the inner upper surface 1
06 and the inner left side surface 105 are acute angles, preferably about 60 °, and similarly, the angle between the inner upper surface 106 and the inner right side surface 107 is also an acute angle, preferably about 6 °.
0 °. The cross-sectional shape of the linear motion block 1 is desirably line-symmetric with respect to the perpendicular bisector of the upper surface 101. The inner left side surface 105 and the inner right side surface 107 each form a bottom surface of a rectangular groove. The upper surface 101, the left side surface 102, the bottom surface 104, and the right side surface 103 form a rectangular parallelepiped outer surface. The upper surface 101 is provided with a screw hole 109 for mounting a table or the like. The front surface 110 and the rear surface 111 are provided with screw holes 108 for attaching a dust mixing prevention plate (not shown) or the like.

An aluminum alloy,
A sliding member 2 integrally formed on a holder 3 made of metal or alloy such as stainless steel is firmly adhered.
Has a horizontal plane protruding downward. Similarly,
A sliding member 2 integrally formed with the holder 3 is firmly adhered to each of the inner left side surface and the inner right side surface, and a projecting plane of the sliding member 2 projects toward the inner surface.

FIGS. 2A and 2B are views showing a holder according to the embodiment of the present invention, wherein FIG. 2A is a plan view and FIG. 2B is a front view. The holder 311 is a rod-shaped material having a C-shaped cross section. It may be made of a metal such as an aluminum alloy or stainless steel, or an alloy, or may be made of a plastic or hard rubber. Since the cross section is constant, a long extruded material or a drawn material can be cut into a predetermined length and used. And the central part 31
A through-hole 315 is formed at a predetermined interval in the center of 2. When the sliding member is mainly composed of a resin which can be heated and melted, the through-hole 315 functions as a relief in order to firmly adhere the holder and the sliding member without any gap in the injection molding die. I do. Further, the central portion 312 and the left portion 313 form an acute angle, and have such a shape that a sliding member formed on the inner surface side of the holder does not fall off the holder. Similarly, the central portion 312 and the right side 314 form an acute angle.

FIG. 3 is a view showing a sliding member according to a first embodiment of the present invention, in which (a) is a plan view thereof,
(B) is a front view thereof. The sliding member 211 of the first embodiment is a rod-like body having a substantially trapezoidal cross section and a constant cross section. It is surrounded by a short bottom surface 215 as a sliding surface, a left side surface 213, a long bottom surface 212, and a right side surface 214. The short bottom surface 215 as a sliding surface is flat. The material of the sliding member is carbon fiber-dispersed resin or carbon fiber-dispersed porous ceramic called "wood ceramic".
The base material of the carbon fiber-dispersed resin is one of an epoxy resin, a polyimide resin, a polyetheretherketone or an ethylene tetrafluoride resin. The base material of the carbon fiber-dispersed porous ceramic is one of zirconia, silicon nitride, boron nitride and the like. The mixing ratio of carbon fiber is
It is determined from the viewpoint of lubrication characteristics and elastic deformation characteristics of the sliding member, and is desirably in the range of 5 to 45% by weight.

FIG. 4 is a view showing a sliding member according to a second embodiment of the present invention, in which (a) is a plan view thereof,
(B) is a front view thereof, and (c) is a partially enlarged front view thereof. The sliding member 211 according to the second embodiment is characterized in that the short bottom surface 215 is provided with a large number of cylindrical projections 22 having a low height. The arrangement of the columnar protrusions 22 is staggered in three rows in the short side direction of the short bottom surface 215 of the sliding member 211. Also, as shown in FIG.
The cylindrical protruding portion 22 has a short cylindrical shape including a circular upper bottom 221 and a side surface 222. Top bottom 2 of columnar projection 22
By changing the sum of the areas 21, the contact area of the sliding member changes and the sliding resistance changes, and the heat radiation characteristics, dust removal characteristics and elastic deformation characteristics also change. Considering these characteristics comprehensively, the upper bottom 221 of the columnar protrusion 22 is
It is preferable to design the diameter and the position of the columnar protrusion 22. Further, the height should be designed in consideration of the fact that not only the compression deformation but also the susceptibility of the slip deformation changes depending on the height of the columnar projection 22.

FIG. 5 is a view showing a sliding member according to a third embodiment of the present invention, wherein (a) is a plan view thereof,
(B) is a front view thereof, and (c) is a partially enlarged front view thereof. Short bottom surface 2 of sliding member 211 of third embodiment
15 has a frusto-conical projection 2 as shown in FIG.
Many 3 are provided. The lower bottom surface 233 is the sliding member 21.
The lower bottom surface 233 is larger than the upper bottom surface 231 in diameter. Therefore, the angle between the side surface 232 and the short bottom surface 215 is an obtuse angle. By making the shape of the projection a frusto-conical shape, the sliding contact area can be reduced while maintaining elastic deformation strength.

FIG. 6 is a view showing a sliding member according to a fourth embodiment of the present invention, wherein FIG.
(B) is a front view thereof, and (c) is a partially enlarged front view thereof. On the short bottom surface 215 of the sliding member 211 of the fourth embodiment, a large number of column-shaped projections 24 with dimples are provided.
As shown in FIG. 6C, the cylindrical projection with dimples 24 has a cylindrical recess 242 having a smaller diameter and having a common center with the upper bottom 241, formed from the surface of the upper bottom 241. In the fourth embodiment, the height of the concave portion 242 is smaller than the height of the cylindrical projection 24 with dimples, but may be changed so that the height is equal or deeper. Lubricating oil and dust are trapped inside the concave portion 242, so that oil does not run out and the sliding surface is less likely to be damaged by dust.

FIG. 7 shows a linear guide rail.
(A) is the top view, (b) is the front view. The cross-sectional shape of the linear guide rail 4 is such that
The lower portion is close to an inverted home base shape including a bottom surface 404, and has a shape in which they are joined at upper and lower intermediate portions, and is constant in the longitudinal direction. Further, a mounting hole 407 penetrating from the upper surface 401 to the bottom surface 404 is formed. Mounting hole 407
Threads may be cut on the inner surface of the.

[0026]

According to the present invention, a sliding member made of carbon fiber-dispersed resin or carbon fiber-dispersed porous ceramic is attached to the sliding surface of the linear motion block of the present invention, and slides directly on a linear motion guide rail made of metal or alloy. First, there is almost no noise, second, there is little change over time, and almost constant accuracy can be maintained. Third, it is applicable to products with a wide range of accuracy from widespread accuracy to high accuracy Fourth, there is an effect that almost no maintenance is required, and fifthly, it is inexpensive.

Providing the sliding member with a protruding portion has the following effects. First, the sliding resistance is reduced, the range of change is wide, and second, the heat radiation and the dust discharge are excellent.

When dimples are attached to the protruding portions, lubricating oil is trapped in the dimples, and there is no oil shortage, and the elastic deformation resistance and rigidity are kept high.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of a linear motion block according to the present invention, wherein (a) is a plan view thereof and (b) is a front view thereof.

FIG. 2 is a view showing a holder according to the embodiment of the present invention;
(A) is the top view, (b) is the front view.

FIGS. 3A and 3B are views showing a sliding member according to the first embodiment of the present invention, in which FIG. 3A is a plan view and FIG. 3B is a front view.

FIGS. 4A and 4B are views showing a sliding member according to a second embodiment of the present invention, in which FIG. 4A is a plan view, FIG. 4B is a front view, and FIG. FIG.

5A and 5B are views showing a sliding member according to a third embodiment of the present invention, wherein FIG. 5A is a plan view, FIG. 5B is a front view, and FIG. FIG.

FIGS. 6A and 6B are views showing a sliding member according to a fourth embodiment of the present invention, wherein FIG. 6A is a plan view, FIG. 6B is a front view, and FIG. FIG.

7A and 7B are diagrams showing a linear guide rail, wherein FIG. 7A is a plan view thereof, and FIG. 7B is a front view thereof.

FIG. 8 is a perspective view including a partial cross section of a conventional LM linear guide rail and LM linear block.

FIG. 9 is a cross-sectional view of a conventional LM linear motion block.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Linear motion block 101 Top surface 102 Left side 103 Right side 104 Bottom 105 Inner side 106 Inner upper surface 107 Inner side 108 Screw hole 109 Screw hole 110 Front 111 Back 2 Sliding member 211 Sliding member 212 Long bottom 213 Left side 214 Right side 215 Short bottom surface 22 Cylindrical protrusion 221 Upper bottom 222 Side surface 23 Truncated conical protrusion 231 Upper bottom surface 232 Side surface 233 Lower bottom surface 24 Cylindrical protrusion with dimple 241 Upper bottom 242 Recess 243 Lower bottom 244 Side surface 3 Holder 311 Holder 312 Central part 313 Left part 314 Right part 315 Through hole 4 Linear guide rail 401 Top side 402 Side 403 Side 404 Bottom 407 Mounting hole 410 Front 411 Back 32 LM linear motion block 321 Top 322 Side 323 Side 328 Jaw 29 Jaw 331 Ball bearing running groove 332 Ball bearing running groove 333 Ball bearing running groove 334 Ball bearing running groove 335 Ball bearing running hole 336 Ball bearing running hole 337 Ball bearing running hole 338 Ball bearing running hole 41 LM linear motion guide rail 415 Bearing running groove 416 Bearing running groove 417 Bearing running groove 418 Bearing running groove 5 Ball bearing 6 End block 7 Dust prevention plate

Claims (4)

[Claims] In a linear motion block having a substantially C-shaped cross section, a plate-like sliding member made of carbon fiber-dispersed resin or carbon fiber-dispersed porous ceramic is attached to an inner upper surface, an inner left surface, and an inner right surface. A linear motion block, wherein a sliding surface of the sliding member and a guide surface of a guide rail contact and slide. 2. The linear motion block according to claim 1, wherein a large number of cylindrical projections are provided on a surface of the sliding member, and an upper surface of the cylindrical projection serves as a sliding surface. 3. The linear motion according to claim 1, wherein a plurality of frusto-conical projections are provided on the surface of the sliding member, and a bottom surface of an upper small circle of the frusto-conical projection serves as a sliding surface. block. 4. The sliding member according to claim 1, wherein a plurality of cylindrical projections with dimples are provided on the surface of the sliding member, and a portion other than the concave portion on the upper bottom surface of the cylindrical projection with dimples becomes a sliding surface. The linear motion block described.