JPH074431A - Linear slide bearing - Google Patents

Abstract

(57) [Summary] [Purpose] A direct acting slide bearing that can hold a large amount of lubricating oil by itself, does not run out of lubricating oil even at high sliding speeds, and does not contaminate peripheral equipment with lubricating oil. I will provide a. [Structure] A plain bearing 1 has a plain bearing body 2 made of synthetic resin, and a lubricating composition 3 of synthetic resin containing lubricating oil,
At least a part of the lubricating composition 3 is the sliding surface 1 of the bearing.
It is shown in a. When the sliding surface 1a is brought into contact with the sliding surface 11a of the raceway 11 and linearly moved, the lubricating oil contained in the lubricating composition 3 gradually exudes for a long period of time and is supplied to both sliding surfaces 1a and 11a. Maintain proper lubrication at all times.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear motion slide bearing used for a linear guide portion of office equipment, audio equipment, measuring equipment and the like.

[0002]

2. Description of the Related Art Conventionally, a linear slide bearing has been used as a mechanism for slidingly guiding the linear movement of parts constituting equipment. This type has a sliding surface that opposes the flat sliding surface of the way and makes a linear reciprocating motion along the way, and the sliding surface of the way is preliminarily lubricated (liquid lubricant) or grease (half By applying a solid lubricant), friction and wear between the sliding surface of the linear motion sliding bearing and the sliding surface of the way can be reduced. Further, it has also been practiced to provide a shallow recess in a part of the linear motion slide bearing to store lubricating oil or grease therein and to supply it to both slide surfaces.

[0003]

However, when lubricating oil or grease is previously applied to the sliding surface of the way,
If the coating amount is too small, the lubricant will run out in a short time. On the other hand, if the coating amount is too large, not only will the lubricant be scattered when the slide bearing slides on the slide surface of the way, it will be wasted, but also the equipment around the slide bearing due to the scattered lubricant. There was a problem that was polluted.

[0004] In the case of grease, the method of scattering is less than that of lubricating oil because it is a semi-solid state, but there is a limit to the deterioration of friction characteristics and the drawability to the sliding part (sliding surface) is poor, so
There is also a problem that the improvement of wear characteristics is worse than that of lubricating oil. Also, when lubricating oil or grease is stored in a shallow recess provided in a part of a linear motion slide bearing, if the sliding speed of the linear motion slide bearing increases, the lubricating oil and grease will scatter. The problems that the lubricant runs out over time or that the scattered lubricant contaminates peripheral devices remain unsolved.

Therefore, the present invention has been made by paying attention to the above-mentioned conventional problems. Even if the sliding speed of the linear motion sliding bearing becomes high, the lubricant is not broken and the lubricant is not used. It is an object of the present invention to provide a linear motion sliding bearing that does not pollute peripheral equipment.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to a linear motion slide bearing which has a sliding surface opposed to a sliding surface of a way and which linearly moves with respect to the way. Of the sliding bearing body and a lubricating composition of a lubricating oil-containing synthetic resin, and the lubricating composition is characterized in that at least a part thereof is exposed on the sliding surface of the bearing.

[0007]

The linear slide bearing of the present invention reciprocates linearly with respect to the way and moves with respect to the sliding surface of the way. When sliding against the sliding surface of the way, a large amount of lubricating oil contained in the lubricating composition itself, which is at least partially exposed on the sliding surface of the bearing, gradually exudes to the exposed portion, It is supplied to the sliding surfaces of bearings and rails. Lubricating oil is supplied in appropriate amounts over a long period of time to exert a good lubricating function. Therefore, the lubricant will not run out. Further, even if the sliding speed is increased, the lubricating oil does not scatter, so that the peripheral equipment is not contaminated.

Further, since the liquid lubricating oil is used, the friction characteristics are better than those of the grease, and the drawability to the sliding surface, which is the sliding portion, is good and the wear characteristics are also good.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment, which is shown in FIG.
Is a front sectional view, and FIG. This linear motion slide bearing 1 comprises a slide bearing main body 2 made of synthetic resin, and a lubricating composition 3 integrated into the slide bearing main body 2.
And the lower end surface is the sliding surface 1a.

Here, the lubricating composition is a polymer made of a polyolefin containing a lubricating oil, a thermosetting resin containing a lubricating oil, or the like. As the lubricating oil, mineral oil, synthetic oil, ester oil, diester oil is used. And so on.
The content of the lubricating oil is preferably 20 to 90% by weight. When the content of the lubricating oil is less than 20% by weight, the effect of the lubricating action is hard to be obtained. On the other hand, it is almost impossible to contain more than 90% by weight of lubricating oil.

The plain bearing main body 2 is provided with a flange 4, a cylindrical body portion 5 extending below the flange 4, and a mounting portion 6 projectingly provided on the upper surface of the flange 4. The body 5 is the lower surface 5
When a is formed into a spherical shape, an annular groove 7 for locking the lubricating composition 3 is formed at the base of the flange 4. The mounting portion 6 is composed of a two-pronged elastic protrusion 9 obtained by dividing a cylindrical column having a taper end at a split groove 8 and has a snap-fit structure in which the elastic restoring force is used for mounting.

The lubricating composition 3 is the sliding bearing body 2 described above.
The lower surface 3a is formed so as to enclose the entire surface of the body portion 5, and the lower surface 3a has a larger radius than the spherical surface of the lower surface 5a of the body portion 5 of the plain bearing body 2. Therefore, the thickness of the spherical portion of the lower surface 3a is gradually reduced toward the spherical top, and the spherical top is a very thin film, for example, 10 μm or less. This is to prevent the fluctuation of the height of the linear motion sliding bearing 1 from becoming large even if the lubricating composition 3 on the spherical top is worn away by the sliding of the bearing. If not, it may be thicker.

As described above, in this embodiment, the lubricating composition 3 is exposed on the sliding surface 1a of the linear motion sliding bearing 1. Next, the operation will be described. The linear motion slide bearing 1 is used by being attached to the lower surface of the movable table 10 as shown in FIG.
By simply inserting the two-pronged elastic projection 9 of the mounting portion 6 of the snap-fit structure into the bearing mounting hole 10a provided in the movable table 10, it can be detachably fixed and mounted with one touch.

In the movable table 10 to which the linear slide bearing 1 is attached, the planar slide surface 11a of the fixed track base 11 formed long in the axial direction is used as a guide surface, and arrows A and B in the figure are used.
Makes a straight line reciprocating in two directions indicated by. With the movement of the movable table 10, the linear slide bearing 1 also moves. During the movement, the top of the spherical sliding surface 1a of the linear motion sliding bearing covered with the film of the lubricating composition 3 becomes the sliding surface 11 of the way.
Slide on a. The lubricating oil preliminarily contained in the lubricating composition 3 oozes out to this sliding portion, and the sliding surface 1a of the linear motion sliding bearing 1 and the rail 11 which is in contact therewith.
It performs a lubricating action with the sliding surface 11a. Since a large amount of lubricating oil is retained inside the lubricating composition 3 and is supplied in an appropriate amount over a long period of time, the lubricating oil can be prevented from running out. Moreover, lubricating oil has better friction characteristics than grease,
Further, since the sliding property between the two sliding surfaces 1a and 11a, which is the sliding portion, is good, the wear characteristics are also good, and low friction, low wear, and long life are guaranteed.

Further, since the excess lubricating oil is not supplied to the sliding surface 1a, even if the sliding speed is increased, the lubricating oil is splashed by the moving direct acting sliding bearing 1 and the periphery of the bearing It does not contaminate the equipment installed in the. FIG. 3 shows a second embodiment. In this embodiment, the sliding surface 1a of the linear motion sliding bearing 1 is not a spherical surface but a circular flat surface, and the lubricating composition 3 is formed into a small-diameter columnar shape so that the axial center portion of the large-diameter cylindrical sliding bearing body 2 is formed. The point different from the above-described first embodiment is that the mounting portion 6 to be mounted on the movable table 10 has a male screw structure instead of a snap-fit structure and is screwed to the movable table 10. There is. In this case, the circular flat lower end surface 3a of the lubricating composition 3 is exposed at the center thereof as a part of the circular flat sliding surface 1a of the linear motion sliding bearing 1.

In the case of the first embodiment described above, the sliding surface 1a of the bearing is initially covered with a thin film of the lubricating composition 3, but as the sliding is repeated, the lubricating composition 3 The thin film is worn and the lower surface 5a of the plain bearing body 2 comes into direct contact with the sliding surface 11a of the raceway 11 to slide.
Therefore, the height of the linear motion sliding bearing 1 fluctuates in the initial stage of sliding, though it is very slight.

On the other hand, in the second embodiment, when the sliding surface 1a of the linear motion sliding bearing 1 comes into contact with the sliding surface 11a of the raceway 11 and slides, the sliding surface made of synthetic resin is used. From the beginning, the bearing body 2 contacts the sliding surface 11a and slides while receiving the load of the movable table 10. Therefore, there is an advantage that the fluctuation of the height of the linear motion slide bearing 1 in the initial stage of sliding becomes small.

Other functions and effects are almost the same as those of the first embodiment. FIG. 4 shows a third embodiment. In the linear motion slide bearing 1 of this embodiment, the slip surface 1a is spherical like the first embodiment. However, the difference is that the mounting portion 6 protruding from the upper surface of the flange 4 of the plain bearing main body 2 made of synthetic resin has a columnar shape, and is configured to be press-fitted and mounted in the mounting hole of the movable table 10.

The lubricating composition 3 does not wrap the entire outer surface of the body 5 of the plain bearing body 2, but divides the side surface of the body 5 from the spherical lower surface 5a into four equal parts in the axial direction. It extends in a strip shape and is formed in a cross shape at the apex portion of the sliding surface 1a, and is exposed as a part of the spherical sliding surface 1a of the linear motion sliding bearing 1. Action. The effect is almost the same as that of the first embodiment.

FIG. 5 shows a fourth embodiment. In the linear motion sliding bearing 1 of this embodiment, a synthetic resin sliding bearing main body 2 has a large-diameter columnar shape, and a circular flat surface, which is the lower end surface thereof, is the sliding surface 1a of the linear motion sliding bearing 1. There is no flange on the upper portion of the plain bearing body 2, and a columnar mounting portion 6 is directly provided on the upper end surface so as to project. Mount the mounting part 6 to the movable table 1
It is to be press-fitted into the mounting hole formed in 0.

The lubricating composition 3 is composed of four small-diameter cylinders, which are fitted into four axial through-holes 2a formed in a circumferentially equidistant portion near the outer circumference of the large-diameter cylindrical sliding bearing body 2. Have been assembled. The circular planar lower end surface 3a of the fitted lubricating composition 3 is the circular planar sliding surface 1 of the linear motion sliding bearing 1.
As a part of a, it is dispersed and exposed at four places. In addition, it is not necessary to limit the number of the lubricating composition 3 to four.

The action and effect of the fourth embodiment are almost the same as those of the second embodiment in which the lubricating composition 3 is exposed as a part of the sliding surface 1a of the linear motion sliding bearing 1.
FIG. 6 shows a fifth embodiment. In the direct acting slide bearing 1 of this embodiment, the body portion 5 of the slide bearing body 2 made of synthetic resin has a large-diameter cylindrical shape, and its lower end surface 5a is the same as in the fourth embodiment.
The circular flat surface is a sliding surface 1a of the linear motion sliding bearing 1. A flange 4 is formed on the upper portion of the plain bearing body 2, and a press-fitting type columnar mounting portion 6 is provided on the upper surface of the flange 4 so as to project therefrom.

The lubricating composition 3 is two flat plates, which are fitted and mounted in two axial deep grooves 5f provided in the body portion 5 of the plain bearing body 2 in parallel.
The planar lower end surface 3a of the plate-like lubricating composition 3 is exposed as two parallel strips as a part of the circular planar sliding surface 1a of the linear motion sliding bearing 1. The action and effect of the fifth embodiment are similar to those of the second to fourth embodiments in which the end surface of the lubricating composition 3 is exposed as a part of the sliding surface 1a of the linear motion sliding bearing 1. is there.

FIG. 7 shows a sixth embodiment. In the linear motion slide bearing 1 of this embodiment, the body portion 5 of a synthetic resin slide bearing body 2 is a square block, and a groove 20 for generating a dynamic pressure for reciprocating linear motion in an arrowhead shape is formed on the lower surface 5a. Is formed. The groove 20 for generating dynamic pressure has an arrow symbol A in the arrowhead direction.
The grooves 20A in the direction and the grooves 20B in the direction of the arrow B are alternately connected in a corrugated form and arranged at substantially equal intervals in the traveling direction. The shape of the groove 20 may be a V shape, a rhombus shape, or any other shape.

The lubricating composition 3 is attached so as to cover the front and rear end surfaces 5b of the body portion 5. The lower end surface 3a of the lubricating composition 3 has a groove 20 for generating a dynamic pressure of the body portion 5.
The front and rear sides of the lower surface 5a having the above are sandwiched and exposed in a strip shape as a part of the sliding surface 1a which is the rectangular bottom surface of the linear motion sliding bearing 1. Here, the lubricating composition 3 has a shape in which opposed flat plate portions 3b and 3b covering the front and rear end surfaces 5b and 5b of the body portion 5 of the plain bearing body 2 are connected by two bands 3c and 3c. The respective bands 3c are fitted and attached to the horizontal grooves 5d formed on the two side faces 5c, 5c of the body portion 5, respectively.

Thus, the lubricating oil gradually exuded from the lower end surface 3a of the lubricating composition 3 exposed as a part of the sliding surface 1a is supplied to the groove 20 for generating dynamic pressure. Now
When the linear motion slide bearing 1 moves linearly in the direction of arrow A along with the movement of the movable base 10, the groove 20B for generating dynamic pressure in the opposite direction is formed.
Pumping action increases the pressure of the lubricating oil at the tip of the arrow to generate dynamic pressure, and thus the linear motion slide bearing 1 and the movable base 10
Support the load of. When the linear motion slide bearing 1 linearly moves in the direction of arrow B opposite to the above, dynamic pressure is similarly generated by the pumping action of the groove 20A for generating dynamic pressure, and the linear motion slide bearing 1
And the load of the movable table 10 is supported.

In this embodiment, the groove 2 for generating dynamic pressure is used.
The dynamic pressure is generated by the pumping action of 0 and the sliding surfaces 1a, 1
Since the lubricating oil film is formed between 1a, the wear is suppressed to the lowest among the above-mentioned respective embodiments. In each of the above embodiments, only one linear motion slide bearing 1 is used, but a plurality of movable bases 10 may be used.

The shape of the linear motion slide bearing 1 is not limited to that of the embodiment, and can be appropriately selected as needed. Further, the arrangement and shape of the lubricating composition 3 are not limited to those in the above-mentioned examples, and may be a combination of the examples or a completely different arrangement and shape.

Although the sliding surface 11a of the raceway 11 has been described as a flat surface, the linear motion slide bearing of the present invention is also applicable to a raceway having a curved sliding surface. Further, although the sliding bearing body 2 and the lubricating composition 3 are described as an integrated body, the lubricating composition 3 is fitted into the sliding bearing body 2 by a clearance fit so that the lubricating composition 3 is self-weighted. It is also possible to make contact with the sliding surface 11a of the way.

[0030]

As described above, the linear motion sliding bearing of the present invention has the sliding bearing body made of synthetic resin and the lubricating composition of the lubricating oil-containing synthetic resin, and the lubricating composition is At least a part of it is exposed on the sliding surface of the bearing, so a large amount of lubricating oil contained in the lubricating composition gradually exudes to the exposed portion, and an appropriate amount of it on the sliding surface of the bearing and washer for a long time. It provides good lubrication function while being supplied one by one. As a result, the sliding surface will not run out of lubricating oil, and the lubricating oil will not scatter even if the sliding speed increases, so that the surrounding equipment will not be contaminated.

Further, since the liquid lubricating oil is used, the friction characteristics are better than those of the grease, and the pullability to the sliding surface, which is the sliding portion, is good and the wear is low.

[Brief description of drawings]

FIG. 1A is a front sectional view of a first embodiment of the present invention,
(B) is a bottom view.

2 (a) is a front sectional view of a usage example of the one shown in FIG. 1, and FIG. 2 (b) is a side sectional view.

FIG. 3 (a) is a front sectional view of a second embodiment of the present invention,
(B) is a bottom view.

FIG. 4A is a front sectional view of a third embodiment of the present invention,
(B) is a bottom view.

FIG. 5 (a) is a front sectional view of a fourth embodiment of the present invention,
(B) is a bottom view.

FIG. 6 (a) is a front sectional view of a fifth embodiment of the present invention,
(B) is a bottom view.

FIG. 7 (a) is a front view of a sixth embodiment of the present invention,
(B) is a bottom view.

[Explanation of symbols]

 1 Linear Motion Sliding Bearing 1a Sliding surface 2 Sliding bearing main body 3 Lubricating composition 11 Rail way 11a Sliding surface

Claims (1)

[Claims] 1. A direct-acting slide bearing which has a sliding surface facing a sliding surface of a way and which moves linearly with respect to the way.
A linear bearing having a plain bearing body made of a synthetic resin and a lubricating composition of a synthetic oil-containing synthetic resin, at least a part of which is exposed on the sliding surface of the bearing. Plain bearing.