JP2884066B2 - Plain bearing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding bearing, and more particularly to a sliding bearing having a function of constantly lubricating a journal of a rotating shaft with a lubricant.

[0002]

2. Description of the Related Art Heretofore, as this type of plain bearing, a so-called oilless type plain bearing manufactured by impregnating a sintered metal with a lubricating oil is known. In this device, fine voids of a sintered metal holding a lubricating oil are opened on an inner peripheral surface in contact with a journal of a rotating shaft.

[0003]

However, according to the above-described conventional slide bearing, the opening of the minute gap which is open on the inner peripheral surface is caused by the sliding between the journal and the inner peripheral surface. There is a problem that clogging is likely to occur due to dust or the like, and if the opening is clogged, the sliding portion between the journal of the rotating shaft and the slide bearing is not sufficiently lubricated. Also,
There is also a possibility that the journal or the like may be damaged by dust entering the sliding portion from the outside.

[0004] The present invention has been made in view of the above problems, and fine dust is generated by sliding between the journal of the rotating shaft and the inner peripheral surface, or fine dust is generated on the sliding portion from the outside. Provided is a sliding bearing in which even if it invades, the lubrication of the sliding portion between the journal of the rotating shaft and the sliding bearing is not impaired by the dust, and the journal and the inner peripheral surface are not likely to be damaged. The purpose is to do.

Another object of the present invention is to provide a sliding bearing capable of effectively feeding a necessary and sufficient amount of a lubricant over the entire sliding portion.

Another object of the present invention is to provide a plain bearing which is easy to manufacture and assemble.

[0007]

According to a first aspect of the present invention, there is provided a sliding bearing in which a journal of a rotating shaft is slidably and rotatably fitted inside so that an inner peripheral surface of the bearing body and an outer peripheral surface thereof come into contact with the journal. A lubricant storage space is provided between
The lubricant storage space is communicated with a through hole having an opening opened in a slit shape in the axial direction of the bearing main body on the inner peripheral surface, and the space and the through hole are filled with a lubricant. The opening that is opened in a slit shape is
The opening width in the circumferential direction of the body is the same as the axial direction on the inner peripheral surface.
From the position corresponding to the central part of the
, Gradually narrowing toward the edge of .

According to the sliding bearing of the present invention, since the opening opened in the inner peripheral surface of the bearing main body is formed in a slit shape in the axial direction of the bearing main body, sliding between the journal of the rotary shaft and the inner peripheral surface is performed. Even if fine dust is generated due to fine dust or fine dust enters the sliding part from the outside, such dust or dust enters the above space through the through hole from the opening and is confined there. Therefore, there is no possibility that the opening is clogged with dust or dust. Therefore, the lubricant filled in the lubricant storage space or the through hole is always normally supplied to the sliding portion through the opening, and the lubricating property of the sliding portion is always kept good. Further, since the dust or dust entering the sliding portion does not stay in the sliding portion forever,
1 is less likely to be damaged by dust or dust.

According to the sliding bearing of the present invention,
The amount of lubricant fed from the opening to the sliding part is
The closer to the edge in the axial direction of the inner peripheral surface, the less,
Moreover, the edge of the opening is inclined with respect to the axial direction of the bearing body.
To become oblique form, fed to the sliding portion from said apertures
By the rotation of the journal,
The center of the inner peripheral surface in the axial direction along the edge
Guided to the department. These phenomena make it necessary and sufficient
A large amount of lubricant spreads over the entire sliding part.
As well as lubricant from both ends of the bearing body in the axial direction to the outside.
Leakage is prevented.

According to a second aspect of the present invention, in the sliding bearing according to the first aspect, the opening which is opened in a slit shape is formed in the axially intermediate portion of the inner peripheral surface, and is formed in the axial direction. A part of the inner peripheral surface is located on both sides of the opening. According to the sliding bearing of the present invention, since the end of the opening in the axial direction has a closed shape, the shape of the end of the opening is deformed by sliding between the journal and the inner peripheral surface. In addition, at both ends in the axial direction of the bearing body, the entire circumference of the journal is completely covered by the inner peripheral surface, so that the lubrication of the sliding portion can be maintained well for a long period of time.

According to a third aspect of the present invention, in the sliding bearing according to the first or second aspect, the through hole is positioned closer to the rotation direction of the rotary shaft as the position is closer to the opening. It is inclined. According to a fourth aspect of the present invention, in the sliding bearing according to the first or second aspect, the through hole is located closer to the rotation direction of the rotating shaft as the position is closer to the opening. It is that it is inclined to.

According to the sliding bearings of the present invention, the amount of lubricant supplied to the sliding portion with the rotation of the journal is adjusted by changing the inclination angle of the through hole. In particular, according to the sliding bearing of the invention according to claim 3 ,
Since the amount of lubricant supplied to the sliding portion increases, it becomes easier to cope with high-speed rotation of the rotating shaft.

According to a fifth aspect of the present invention, there is provided the plain bearing according to the first or second aspect, wherein the axially central portion of the inner peripheral surface extends in an annular shape crossing the opening. That is, a lubricant flow groove is formed. According to the sliding bearing of the present invention, since the lubricant is supplied from the lubricant flow groove to the portion between the adjacent openings, the lubricant is uniformly distributed around the entire circumference of the sliding portion. No lubricant is fed.

According to a sixth aspect of the present invention, there is provided the sliding bearing according to the first or second aspect, wherein the wall surfaces on both sides in the circumferential direction in the lubricant storage space are close to each other in the through hole. It is inclined to become gradually narrower. According to the sliding bearing of the present invention, the lubricant does not stay in the lubricant storage space.

According to a seventh aspect of the present invention, in the sliding bearing according to any one of the first, second, third, fourth, fifth, and sixth aspects, the lubricant is stored. The bearing main body including the space and the through hole is divided into a plurality of members in the axial direction, and the divided members are coupled in the axial direction.

The sliding bearing according to the present invention is formed by joining a plurality of divided members, so that the lubricant storage space and the through hole having the opening can be easily formed. Whether the bearing is a synthetic resin sliding bearing or a metal sliding bearing such as a casting, the bearing can be easily manufactured without any trouble.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a partially cutaway front view showing a sliding bearing according to an embodiment of the present invention, and FIG.
FIG. 3 is an enlarged view of a main part of FIG. 2, and FIG. 4 is a sectional view of the sliding bearing according to a modification taken along the line II-II of FIG. FIG. 5 is a longitudinal sectional front view in which main parts of the above-described sliding bearing according to another modification are enlarged, and FIG. 6 is a longitudinal sectional side view showing the sliding bearing in an exploded manner.

As can be seen from FIG. 1, FIG. 2 or FIG. 6, in this plain bearing, the bearing body 10 is divided into two members, that is, a first member 1 and a second member 2 in the axial direction. The first member 1 and the second member 2 are connected in the axial direction. Specifically, the first member 1 is provided with an annular portion 11 in an annular shape and an annular flange portion 12 provided on the annular portion 11, and the second member 2 fitted to the annular portion 11 is provided.
Are connected to the first member 1.

The bearing body 10 has an inner peripheral surface 31 in which a journal of a rotating shaft (not shown) is slidably and rotatably internally fitted and comes into contact with the journal. Also,
A lubricant storage space (hereinafter, referred to as a “space”) 4 having eight cavities between the inner peripheral surface 31 and the outer peripheral surface 32 of the bearing body 10 at equal intervals in the circumferential direction of the bearing body 10. Are provided, and a straight through-hole 5 is communicated with the space 4. The through hole 5 is provided in the bearing main body 1.
0 has an opening 51 opened on the inner peripheral surface 31. The opening 51 is open in a slit shape that is long in the axial direction of the bearing body 10. As illustrated in FIG. 2, the opening 51 is formed at the axially intermediate portion of the inner peripheral surface 31, and the opening 51 is formed at both sides of the opening 51 in the axial direction. Part 31a, 31 of inner peripheral surface
a is located. The space 4 has a diameter of 0.3 mm.
An air vent hole 42 composed of a small hole of about 2 to 0.3 mm communicates. The air vent hole 42 has a role of releasing air when the space 4 is filled with a lubricant such as grease.

In the sliding bearing shown in FIG.
The shape of the space 4 as viewed from the 0 axis is a rectangle or a rectangle as shown by a hidden line (broken line) in FIG.
As shown in FIGS. 1 and 5, the wall surfaces 41, 41 on both sides in the circumferential direction of the bearing body 10 in the space 4 are inclined so that the mutual interval gradually narrows toward the through hole 5. I have. More specifically, those wall surfaces 41,
41 is a symmetrical surface curved so as to project outward.

As shown in FIGS. 2 and 3, the opening 51, which is opened in a slit shape, is formed so that the opening width in the circumferential direction of the bearing main body 10 is at the center of the inner circumferential surface 31 in the axial direction. From the corresponding position, it gradually narrows toward the axial edge of the inner peripheral surface 31, and the edge has an arc-shaped closed shape. In other words, as described above, the opening 51 is formed at the axially intermediate portion of the inner peripheral surface 31, and the portions 31 a, 31 a of the inner peripheral surface are located on both sides of the opening 51. Therefore, the opening 51 does not open at the axial end surface of the bearing body 10.

A lubricant flow groove (hereinafter, referred to as an "annular groove") 6 extending in an annular shape intersecting with the opening 51 is formed at the central portion of the inner peripheral surface 31 in the axial direction.

The above-described space 4, the through-hole 5 having the opening 51, and the annular groove 6 are formed by dividing the bearing body 10 into the first member 1 and the second member 2. Are provided symmetrically. The space 4 and the through hole 5 are filled with a lubricant (not shown). Grease can be suitably used as the lubricant, and wax can also be used. When grease is used as the lubricant, the limit PV value as a reference value for suppressing the heat generation limit and the seizure limit due to friction becomes extremely large, and the high-speed rotation performance is improved. The lubricant that can be used has such a viscosity that it does not flow out of the opening 51 indefinitely when the journal of the rotating shaft is internally fitted to the inner peripheral surface 31, and the lubricant that flows from the opening 51 when the rotating shaft rotates. It is preferable to use a material having fluidity such that an appropriate amount of lubricant is evenly fed to a sliding portion between the journal and the inner peripheral surface 31. If such a property is provided, It may be a solid lubricant (including powder) or a liquid lubricant.

According to the sliding bearing described above, the opening 51 opened on the inner peripheral surface 31 of the bearing body 10 is
Since the slit is long in the axial direction of 0, fine dust is generated due to sliding between the journal of the rotating shaft and the inner peripheral surface 31 or fine dust is externally generated in a sliding portion between the two. Even if it enters, the dust and dust enter the space 4 from the opening 51 through the through hole 5 and are confined therein, so that the opening 51 is not likely to be clogged. The possibility that the journal or the inner peripheral surface 31 is damaged by dust or dust entering the sliding portion is reduced. for that reason,
The lubricant is always normally supplied to the sliding portion through the opening 51, and the lubricating property of the sliding portion is always kept good, and at the same time, the service life due to the damage of the journal and the inner peripheral surface 31 is improved. Is suppressed.

Here, the diameter of the inner peripheral surface 31 is 8-10.
When the opening 51 is shaped as shown in FIG. 3 in a slide bearing formed to have a maximum opening width W of the opening 51 in the circumferential direction of the bearing body 10 of 0.
3 to 0.7 mm, and the radius R of the arc-shaped edge is 0.1 to
When the thickness is set to 0.2 mm, clogging of the opening 51 does not occur, and the amount of lubricant fed from the opening 51 to the sliding portion is appropriately maintained in accordance with the rotation speed of the rotating shaft. Dripping. In addition, since the end of the opening 51 in the axial direction has a closed shape, the end of the opening 51 does not break or violently wear due to sliding with the journal. Moreover, at both ends in the axial direction of the bearing body 10, the entire inner periphery of the journal is completely wrapped by the circular inner peripheral surface 31 as can be seen in FIG. Well maintained.

The opening 51 has a wedge shape at both ends as shown in FIG.
Of the opening 51,
Therefore, the amount of the lubricant supplied to the sliding portion decreases as the portion of the inner peripheral surface 31 closer to the axial end edge decreases. Moreover, the edge 52 of the opening 51 is slightly inclined with respect to the axial direction of the bearing body 10 (the direction of the arrow a in FIG. 3).
For this reason, the flow (arrow f) of the lubricant fed from the opening 51 to the sliding portion is caused by the rotation of the journal in the direction of arrow S along the rim 52 along the inner peripheral surface 31.
At the center in the axial direction. Due to these phenomena, a necessary and sufficient amount of the lubricant spreads over the entire sliding portion.

Further, the annular groove 6 is formed on the inner peripheral surface 31.
Is formed, the lubricant entering the annular groove 6 from the opening 51 is supplied from the annular groove 6 to a location between the adjacent openings 51. The lubricant is uniformly supplied to the entire circumference of the sliding portion.

Further, since the wall surfaces 41 of the space 4 are inclined so that the distance between them gradually becomes smaller as approaching the through hole 5, the lubricant does not stagnate in the space 4 and the lubricant 4 There is an advantage that waste is eliminated.

In the plain bearing described above, the first
The through hole 5 having the space 4 and the opening 51 provided separately for the member 1 and the second member 2 is provided on the inner peripheral surface 31.
Are arranged symmetrically with respect to the above-mentioned central portion in the axial direction, but this point is different from the plain bearing according to the modification shown in FIG. The through hole 5 having 51 may be displaced.

FIG. 5 shows the through hole 5 inclined such that the closer to the opening 51, the closer to the rotation direction S of the rotation shaft. Symbol θ is the inner peripheral surface 3
1 shows an inclination angle of the through hole 5 with respect to one radial direction. In this way, by changing the inclination angle θ of the through-hole 5, the amount of lubricant supplied to the sliding portion with the rotation of the journal is adjusted. That is, the smaller the inclination angle θ is, the smaller the amount of lubricant supplied is. Therefore, if the through-hole 5 is inclined in the direction of FIG. 5, the amount of lubricant supplied increases as compared with the case where the through-hole 5 is oriented in the radial direction. It will be easier. Such a lubricating agent feed amount adjusting effect is exerted even when the through hole 5 is inclined to the side opposite to FIG.
By doing so, the feed amount of the lubricant can be kept extremely small, so that it is easy to cope with low-speed rotation of the rotating shaft.

The above-mentioned plain bearing can be manufactured from a synthetic resin molded body, especially a synthetic resin molded body having a high heat resistance, chemical resistance and abrasion resistance. It is very beneficial to divide 10 into a first member 1 and a second member 2. That is, if the space 4 and the through-hole 5 are separately provided for the first member 1 and the second member 2, the molding thereof becomes easy. In addition, as a means for joining the first member 1 and the second member 2 separately molded of a synthetic resin, it is preferable to employ a high-frequency welding method. In this case, as shown in FIG. If the projections 21 are provided at a plurality of locations on one end face of the second 2,
The welding time can be shortened and the production efficiency is improved. Also, the first
In order to ensure the airtightness of the joint surface between the member 1 and the second member 2, it is desirable to employ the high frequency welding method.

FIG. 7 shows a slide bearing in which the annular flange 12 of the first member 1 in the slide bearing shown in FIG. 4 is omitted. In the plain bearing of FIG. 3, the other configuration and operation are the same as those described above, and therefore, the same portions are denoted by the same reference numerals and detailed description thereof will be omitted.

Although the bearing body 10 of the above-described embodiment has the bearing body 10 divided into the first member 1 and the second member 2, this point is that the bearing body 10 is divided into three or more members in the axial direction. May be divided into a plurality of members.

[0034]

According to the sliding bearing of the present invention, the lubricant is fed to the sliding portion between the journal of the rotating shaft and the sliding bearing from the opening opened on the inner peripheral surface of the bearing body, and the opening is formed in the above-mentioned manner. Since it is open in a slit shape on the inner peripheral surface, the opening is not clogged and the lubrication of the sliding part is not impaired, and the lubrication of the sliding part is always kept good. The effect obtained is as follows.

Further, according to the sliding bearing of the present invention, a necessary and sufficient amount of lubricant can be effectively fed over the entire sliding portion.

Further, it is possible to provide a plain bearing which is easy to manufacture and assemble.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of a sliding bearing according to an embodiment of the present invention.

FIG. 2 is a vertical sectional side view of a portion along the line II-II in FIG.

FIG. 3 is an enlarged view of a main part of FIG. 2;

FIG. 4 shows the sliding bearing according to a modified example as II-I in FIG.
It is a vertical side view represented by the cross section of the part which follows the I line.

FIG. 5 is an enlarged longitudinal sectional front view of a main part of the plain bearing according to another modification.

FIG. 6 is an exploded longitudinal side view of the slide bearing.

FIG. 7 shows the sliding bearing according to another modified example as II in FIG.
FIG. 2 is a vertical cross-sectional side view of a portion along a line II.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st member 2 2nd member 4 Space (lubricant storage space) 5 Through-hole 6 Annular groove part (lubricant circulation groove part) 10 Bearing main body 31 Inner peripheral surface 31a Part of inner peripheral surface 32 Outer peripheral surface 41 Wall surface 51 Opening S Rotation axis rotation direction

Claims (7)

(57) [Claims] 1. A lubricant storage space is provided between an inner peripheral surface of the bearing body in which the journal of the rotating shaft is slidably and rotatably fitted inside and an outer peripheral surface thereof in contact with the journal, and the lubricant is provided. The storage space is communicated with a through-hole having an opening opened in a slit shape in the axial direction of the bearing body on the inner peripheral surface, and the lubricant is filled in the lubricant storage space and the through-hole. The above opening, which is open in a slit shape
The opening width of the bearing body in the circumferential direction is
From the position corresponding to the axial center in the inner circumference
A sliding bearing characterized in that the surface gradually narrows toward the axial edge . 2. The slit-shaped opening is formed at an intermediate portion in the axial direction on the inner peripheral surface, and a part of the inner peripheral surface is located on both sides of the opening in the axial direction. The plain bearing according to claim 1. 3. The sliding bearing according to claim 1, wherein the through hole is inclined such that the closer to the opening, the closer to the rotation direction of the rotation shaft. 4. The slide bearing according to claim 1, wherein the through hole is inclined such that the closer to the opening, the more the position is opposite to the rotation direction of the rotating shaft. 5. The sliding bearing according to claim 1, wherein a lubricant flow groove extending in an annular shape crossing the opening is formed at a central portion of the inner peripheral surface in the axial direction. 6. The wall surface on both sides in the circumferential direction in the lubricant storage space is inclined so that the mutual interval gradually becomes narrower as approaching the through hole.
The slide bearing described in 1. 7. The bearing body including the lubricant storage space and the through hole is divided into a plurality of members in the axial direction, and the divided members are connected in the axial direction. Claim 1, Claim 2, Claim 3, Claim 4,
A plain bearing according to any one of claims 5 and 6 .