JP2002242929A - Spherical slide bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing capable of achieving high reliability, especially applicable to aircrafts and space devices, without problems of damage in a solid lubricating coating in assembling the bearing, or deterioration of a bearing function due to opening or the like in outer ring split bodies when a load is applied. SOLUTION: This spherical slide bearing is provided with an inner ring 1 having a convex slide surface 3 and an outer ring 2 having a concave slide surface 4. On either or both of the slide surface 3 of the inner ring 1 and the slide surface 4 of the outer ring 2, solid lubricating coating 9 is provided. The outer ring 2 is split to the outer ring split bodies 2a and 2b arranged in a circumferential direction. On an outer diametric surface of the outer ring 2, an outer circle 5 is provided to be engaged in an interference fit state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spherical sliding bearing which oscillates under a load and permits a tilt of a shaft, the sliding surface of which is provided with a solid lubricating film. And spherical bearings used for aerospace equipment such as artificial satellites.

[0002]

2. Description of the Related Art As shown in FIG.
This is a combination of an inner ring 11 having a convex spherical sliding surface 13 and an outer ring 12 having a concave spherical sliding surface 14. The inner ring 11 rotates or swings while receiving a load, and the inclination of the shaft is reduced. Has been tolerated. In the case of spherical plain bearings for aircraft and space equipment, the inner ring 11 and the outer ring 12 are provided so that a long lubrication life can be obtained without requiring maintenance and that the atmosphere is not contaminated by evaporation of the lubricant.
The sliding surfaces 13 and 14 are often provided with a solid lubricating film.

In this type of conventional spherical plain bearing, in order to facilitate assembly, the outer ring 12 is divided at one location in the circumferential direction, or the outer ring 12 is divided into two outer ring divided bodies arranged in the circumferential direction. Thus, the inner ring 11 is incorporated inside the outer ring 12. In a type in which the outer race 12 is divided at one place in the circumferential direction, the inner race 11 is press-fitted inside the outer race 12 at the time of assembly. In a type in which the outer ring 12 is divided into two outer ring divided bodies, as shown in FIG. 14, the outer ring is formed by a band 15 made of a coil spring, a steel belt, or the like in a state where the two outer ring divided bodies hold the inner ring 11. 12 is restrained from the outer diameter side so that the outer ring split body does not separate.

[0004]

Among these conventional examples, a spherical plain bearing of the type in which the outer ring is divided at one place is described below.
When the inner ring is incorporated inside the outer ring, the sliding surface 13 of the inner ring 11 and the inner diameter of the outer ring 12 come into contact as shown in FIG. Therefore, the sliding surfaces 13, 1 of the inner ring 11 and the outer ring 12
In the case where the solid lubricating film is applied to a surface-treated solid lubricating film, the solid lubricating film may be damaged due to the above-mentioned contact during assembly. This coating is so thin that it is easily damaged. In addition, since the outer race 12 is deformed at the time of assembly, accuracy is deteriorated.

[0005] Among the above conventional examples, in the case of a spherical plain bearing in which the outer ring is divided into two outer ring divided bodies, the solid lubricating film is not damaged at the time of assembly, but the two outer rings are restrained by the band. When a load is applied to the divided bodies, the divided bodies may be shifted from each other in the axial direction and open, which may impair the bearing function. Spherical plain bearings used in aircraft and space require particularly high reliability, so that damage such as peeling of the solid lubricating film during assembly as described above is not allowed. Must be designed so as not to interfere with If the damage of the solid lubricating film on the spherical plain bearings greatly affects the rotational torque and the lubrication performance, space equipment such as satellites cannot be maintained, causing serious damage such as stopping the entire system. . Therefore, a highly reliable spherical plain bearing is required.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a lubricating performance excellent in durability by a solid lubricating film, and to improve the bearing function due to damage of the solid lubricating film at the time of assembling the bearing and displacement of the outer ring split body when a load is applied. An object of the present invention is to provide a spherical plain bearing which can obtain high reliability without a problem of deterioration.

[0007]

According to a first aspect of the present invention, a spherical plain bearing includes an inner ring having a convex spherical sliding surface and an outer ring having a concave spherical sliding surface fitted to the sliding surface. And a solid lubricating film is provided on one or both of the sliding surface of the inner ring and the sliding surface of the outer ring. In the spherical plain bearing of this premise, the outer ring is assumed to be divided into two outer ring divided bodies arranged in a circumferential direction,
An outer ring is provided that fits tightly on the outer diameter surface of the outer ring. According to this configuration, since the outer ring is divided into two outer ring divided bodies arranged in the circumferential direction, the inner ring can be assembled by combining the two outer ring divided bodies at the time of assembling the bearing, and the assembly process is impossible. The contact does not occur and the solid lubricating coating is not damaged. Although the outer ring is divided into two outer ring divided bodies, it is constrained by an outer ring fitted in an outer diameter surface in a tightly fitted state. Bearing performance is maintained without mutual opening. As described above, there is no problem of damage to the solid lubricating film at the time of assembling or opening of the outer ring at the time of use, and high reliability can be obtained. for that reason,
It is also possible to apply to aircraft, space equipment, and the like.

In the present invention, the material of the outer ring may be a material having the same linear expansion coefficient as the material of the inner ring or the outer ring. Thereby, the change of the interference of the interference fit between the outer ring and the outer ring due to the temperature change is reduced, and even if there is a large temperature change, the outer ring can be securely tightened by the outer ring. Therefore, high reliability can be maintained even when used in an environment with a large temperature change such as an aircraft or a space device.

A spherical sliding bearing according to a second aspect of the present invention includes an inner ring having a convex spherical sliding surface, and an outer ring having a concave spherical sliding surface fitted to the sliding surface. In one or both of the sliding surface and the sliding surface of the outer ring provided with a solid lubricating coating, the outer ring is divided into two outer ring divided bodies arranged in the axial direction. They are joined together by fastening parts. According to this configuration, since the outer ring is divided into two outer ring divided bodies arranged in the axial direction, the inner ring can be assembled by combining the two outer ring divided bodies at the time of assembling the bearing. It does not damage the solid lubricating coating. Since the outer ring segments on both sides are connected to each other by the fastening part, they can be firmly connected. Therefore, even if a large load is applied during the use of the bearing, the outer ring split bodies do not shift and open each other, and the bearing performance is maintained. Thus, damage to the solid lubricating coating during assembly,
There is no problem of the outer ring opening during use, and high reliability can be obtained. Therefore, the present invention can be applied to aircraft, space equipment, and the like.

[0010] In the present invention, the two outer ring divided bodies arranged in the axial direction may be fitted with an inlay cage. By fitting the seals in this way, it is possible to accurately prevent the two outer ring split bodies from shifting in the radial direction, and to prevent the solid lubricating coating from being damaged by a minute shift in the radial direction. for that reason,
Even higher reliability can be obtained. Further, in this example, the fastening component only needs to be able to obtain an axial fastening force, and does not have to have a radial restraining function.

In the present invention, the solid lubricating coating comprises:
It may be made of a solid lubricant for vacuum for use in outer space. The solid lubricant for vacuum does not cause evaporation or the like in a vacuum environment. In the present invention, the use of such a solid lubricant makes the lubricant suitable for space equipment such as artificial satellites.

In the present invention, the material of the outer ring and the inner ring may be stainless steel. This prevents the outer ring and the inner ring from rusting, and provides high reliability over a long period.

[0013]

FIG. 1 shows a first embodiment of the present invention.
And FIG. The spherical plain bearing of the present embodiment includes an inner ring 1 having a convex spherical sliding surface 3 and an outer ring 2 having a concave spherical sliding surface 4 fitted to the sliding surface 3.
A solid lubricating coating 9 is provided on one or both of the sliding surface 3 of the inner ring 1 and the sliding surface 4 of the outer ring 2.
FIG. 1B shows an example in which a solid lubricating coating 9 is provided on both the inner ring 1 and the outer ring 2. The outer ring 2 is divided into two outer ring divided bodies 2a and 2b arranged in a circumferential direction, and an outer ring 5 is fitted on the outer diameter surface of the outer ring 2 in a tightly fitted state. To be precise, the outer ring 2 is divided into two outer ring divided bodies 2a and 2b along a plane passing through the central axis of the outer ring 2 and parallel to the central axis. In this division, the cutting margin of the tool is generated in the cutting by the tool. Therefore, after manufacturing the integral ring-shaped outer ring 2, the outer ring 2 is divided by a so-called natural split. The outer diameter surface of the outer ring 2 is formed with a notch for natural splitting.

The outer ring 5 has a circular front shape and a L-shaped cross section having a flange-like shoulder 5a protruding toward the inner diameter side at one end in the axial direction. This shoulder 5a
Then, the width surface of the outer race 2 is engaged. Notches 6 are formed in the shoulder 5a at a plurality of positions in the circumferential direction. The outer ring 5 is thicker than the outer ring 2. The material of the inner ring 1 and the outer ring 2 is stainless steel. The material of the outer ring 5 is a material having the same coefficient of linear expansion as the material of the inner ring 1 or the outer ring 2, and for example, stainless steel, titanium alloy, or the like is used.

The material of the solid lubricating coating 9 can be resin, molybdenum disulfide (MoS2), gold, silver, lead or the like. As a method for forming the solid lubricating film 9, application, baking, thermal spraying, sputtering, ion plating or the like can be applied. When this bearing is used in outer space, it is preferable to use a solid lubricant for vacuum as a material of the solid lubricating film 9. As a solid lubricant for vacuum, molybdenum disulfide (MoS2), gold, silver, lead and the like can be used. The method of forming a film differs depending on the material. In the case of a resin, coating is used. In the case of molybdenum disulfide (MoS2), firing or sputtering is preferable, and in the case of lead, thermal spraying or ion plating is preferable. In the case of gold and silver, ion plating is used.

In the spherical plain bearing of this configuration, the outer ring 2 is divided into two outer ring divisions 2a and 2b arranged in the circumferential direction.
By combining a and 2b, the inner ring 1 can be assembled, and the solid lubricating coating 9 is not damaged due to excessive contact during the assembly process. Two outer ring divided bodies 2a, 2
b, since the outer ring 5 is fitted by interference fit,
The binding force is stronger than that of a conventional band that gives a binding force. Therefore, when a large load is applied during use of the bearing, the outer ring split bodies 2a and 2b do not shift and the outer ring 2 does not open, and high reliability can be secured. In the case of the conventional band, the material is limited, but in the case of the outer ring 5, the degree of freedom of the material is increased, so that the design becomes easy. Outer ring 2
A delicate step may occur on the mating surface formed between the split outer ring divided bodies 2a and 2b, and this step may damage the solid lubricating film 9 of the inner ring 1, but in this embodiment, the outer ring 2 is Since the ring 5 is firmly constrained, the step can be removed by post-processing. Therefore, it is possible to prevent the solid lubricant film 9 from being damaged due to the step. In the conventional restraint using a band, since the restraining force is small, it is difficult to remove the step by post-processing.

As described above, in this spherical plain bearing, the two outer ring divided bodies 2a and 2b arranged in the circumferential direction are firmly restrained by the outer ring 5 fitted to the outer diameter surface in a tight fit state. Not only does the solid lubricating coating 9 not be damaged during assembly, but also the outer ring 2 does not open when receiving a load, and high reliability can be obtained. The material of the outer ring 5 is a material (stainless steel, titanium alloy, etc.) having a linear expansion coefficient similar to that of the material of the inner ring 1 and the outer ring 2 (stainless steel). The change in the interference of the interference fit is reduced, and even if there is a large temperature change, the outer ring is securely tightened by the outer ring. Therefore, high reliability can be maintained even when used in an environment with a large temperature change such as an aircraft or a space device.

In this embodiment, since the outer ring 5 is provided with the shoulder 5a for engaging the width surface of the outer ring 2,
The axial position of the outer ring 5 with respect to the outer ring 2 is accurately determined. Therefore, when the bearing is installed on the bearing-using device via the outer ring 5, the axial center position of the bearing with respect to the bearing-installed device is accurately determined. The presence of the shoulders 5a hinders the workability of separating the outer ring 5 from the outer ring 2, but since the notches 6 are formed at a plurality of locations on the shoulders 5a, the pressing jig can be removed from these notches 6. By inserting, the outer ring 5
And the outer ring 2 can be easily separated. When high accuracy is required, it is necessary to set an appropriate margin for the entire circumference of the outer ring 5 with respect to the outer ring 2, and re-cut the inner diameter surface of the outer ring 5 or the outer diameter surface of the outer ring 2 many times. I do. That is, a process of assembling the bearing and performing a use condition test is performed, and a process of reshaping a tightly tightened portion after disassembling the bearing is repeated several times. For this reason, the outer ring 5 needs to be easily detached from the outer ring 2, and such a demand can be dealt with by the notch 6 of the shoulder 5a.

The notch 6 in the shoulder 5a is not always necessary, and the outer ring 5 does not have the notch 6 in the shoulder 5a as in the second embodiment shown in FIGS. Is also good.

FIGS. 5 and 6 show a sectional view and a side view of a third embodiment of the present invention. The spherical plain bearing of this embodiment is the same as the spherical plain bearing of the first embodiment shown in FIGS. 1 and 2 except that the shoulder 5a of the outer ring 5 is omitted.
The axial widths of the outer ring 2 and the outer ring 5 are the same. Other configurations are the same as those of the first embodiment.

FIGS. 7 and 8 show a sectional view and a side view of a fourth embodiment of the present invention. The spherical slide bearing of this embodiment is different from the spherical slide bearing of the first embodiment shown in FIGS. 1 and 2 in that the outer peripheral shape of the outer ring 5 is not circular but square. The outer ring 5 does not have the shoulder 5a in the embodiment of FIG. The outer peripheral shape of the outer ring 5 may be a free shape other than the circular shape. As shown in FIG. 8B, the outer ring 5 may be provided with a bolt hole or a hole 17 serving as a through hole for bolting. Thus, the spherical plain bearing can be directly attached to the device without using a housing. Incidentally, in the case of the conventional example in which the split outer ring is restrained by a band, a housing is necessarily required.

FIGS. 9 and 10 show a cross-sectional view and a side view of a fifth embodiment of the present invention. The spherical plain bearing of this embodiment includes an inner ring 1 having a convex spherical sliding surface 3 and an outer ring 2 having a concave spherical sliding surface 4 fitted to the sliding surface 3. The outer ring 2 is divided into two outer ring divided bodies 2c and 2d arranged in the axial direction. These outer ring divided bodies 2c and 2d are fitted with a ring-shaped convex portion 31 provided on the outer peripheral edge of the opposing surfaces of the two and an annular concave portion 32 fitted into the ring-shaped convex portion 31, and are fitted in the circumferential direction. Are integrally connected by the fastening part 7 at a plurality of locations. The fastening part 7 is made of a rebed, and is divided into two outer ring divided bodies 2c and 2d.
And is fastened by being inserted into a fastening component insertion hole with a counterbore provided in alignment with the hole. Sliding surface 3 of inner ring 1 and outer ring 2
Solid lubricating film 9 on one or both of the sliding surfaces 4
Is the same as in the first embodiment.

In the spherical plain bearing of this embodiment, the outer ring 2 is divided into two outer ring divisions 2c and 2d arranged in the axial direction, so that the solid lubricating coating 9 is not damaged during assembly. The two outer ring divided bodies 2c and 2d are connected to a fastening part 7 made of rivets.
, The binding force is stronger than in the case of the conventional example in which a binding force is applied by a band. Therefore, when a load is applied, the outer ring divided bodies 2c and 2d shift and
Can be opened and high reliability can be secured. Thus, also in this embodiment, prevention of damage to the solid lubricating coating 9 and reliability of the bearing function are ensured.

Also, two outer ring divided bodies 2 arranged in the axial direction
Since c and 2d are fitted with the Inro cage, the two outer ring divided bodies 2
The displacement of c and 2d in the radial direction can be prevented with high accuracy, and the minute displacement in the radial direction can also be prevented from damaging the solid lubricating coating. Therefore, higher reliability can be obtained.
Further, when the intaglio fitting is performed in this manner, the fastening component 7 only needs to be able to obtain a fastening force in the axial direction, and does not need to have a radial restraining function.

FIGS. 11 and 12 are a sectional view and a side view of a sixth embodiment of the present invention. The spherical slide bearing of this embodiment is different from the spherical slide bearing of the fifth embodiment shown in FIGS.
A bolt is used instead of the rivet as the fastening member 8 for integrally connecting the 2d. Other configurations are shown in FIGS.
This is the same as the fifth embodiment.

[0026]

According to a first aspect of the present invention, a spherical plain bearing includes an inner ring having a convex spherical sliding surface and an outer ring having a concave spherical sliding surface fitted to the sliding surface. Wherein a solid lubricating coating is provided on one or both of the sliding surface of the inner ring and the sliding surface of the outer ring, and the outer ring is divided into two outer ring divided bodies arranged in a circumferential direction, Since the outer ring fitted with an interference fit on the outer diameter surface of the outer ring is provided, lubricating performance with excellent durability is obtained by the solid lubricating film, and when the solid lubricating film is damaged at the time of assembling the bearing or when a load is applied. There is no problem of the deterioration of the bearing function due to the displacement of the outer ring divided body, and high reliability can be obtained.
A spherical sliding bearing according to a second aspect of the present invention includes an inner ring having a convex spherical sliding surface, and an outer ring having a concave spherical sliding surface fitted to the sliding surface, A solid lubricating film is provided on one or both of the sliding surface of the inner ring and the sliding surface of the outer ring, and the outer ring is divided into two outer ring divided bodies arranged in the axial direction, and the two outer ring divided bodies are fastened. Solid lubricating performance is obtained by solid lubricating film because they are integrally joined by parts, and damage to the solid lubricating film when assembling the bearing and deterioration of bearing function due to displacement of the outer ring split body when load is applied, etc. And high reliability can be obtained.

[Brief description of the drawings]

FIG. 1A is a sectional view of a spherical plain bearing according to a first embodiment of the present invention, and FIG. 1B is a partially enlarged sectional view thereof.

FIG. 2 is a side view of the spherical plain bearing.

FIG. 3 is a sectional view of a spherical plain bearing according to a second embodiment of the present invention.

FIG. 4 is a side view of the spherical plain bearing.

FIG. 5A is a sectional view of a spherical plain bearing according to a third embodiment of the present invention, and FIG. 5B is a partially enlarged sectional view thereof.

FIG. 6 is a side view of the spherical plain bearing.

FIG. 7A is a sectional view of a spherical plain bearing according to a fourth embodiment of the present invention, and FIG. 7B is a partially enlarged sectional view thereof.

FIGS. 8A and 8B are side views of an example in which a hole for a bolt is provided and an example in which the hole is not provided in the spherical bearing.

FIG. 9A is a sectional view of a spherical plain bearing according to a fifth embodiment of the present invention, and FIG. 9B is a partially enlarged sectional view thereof.

FIG. 10 is a side view of the spherical plain bearing.

11A is a sectional view of a spherical plain bearing according to a sixth embodiment of the present invention, and FIG. 11B is a partially enlarged sectional view thereof.

FIG. 12 is a side view of the spherical plain bearing.

FIG. 13 is a sectional view of a conventional example.

FIG. 14 is a cross-sectional view of another conventional example.

FIG. 15 is an explanatory view of a problem at the time of assembly in the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Inner ring 2 ... Outer ring 2a, 2b ... Outer ring division body 2c, 2d ... Outer ring division body 3 ... Inner ring sliding surface 4 ... Outer ring sliding surface 5 ... Outer ring 7 ... Fastening part 8 ... Fastening part

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3J011 JA01 KA04 SB02 SB12 SB15 SE04 3J012 AB01 BB03 DB03 3J105 AA25 AB31 AC10 CC21 CE07 CE15

Claims (6)

[Claims] 1. A spherical plain bearing having an inner ring having a convex spherical sliding surface and an outer ring having a concave spherical sliding surface fitted to the sliding surface, wherein the sliding surface of the inner ring and the outer ring are provided. A solid lubricating film is provided on one or both of the sliding surfaces of the outer ring, and the outer ring is divided into two outer ring divided bodies arranged in the circumferential direction, and the outer ring is fitted to the outer diameter surface of the outer ring in a tight fit state. Spherical plain bearing with an outer ring that is 2. The spherical plain bearing according to claim 1, wherein the material of the outer ring is a material having a linear expansion coefficient similar to that of the material of the inner ring or the outer ring. 3. A spherical plain bearing having an inner ring having a convex spherical sliding surface and an outer ring having a concave spherical sliding surface fitted to the sliding surface, wherein the sliding surface of the inner ring and the outer ring are provided. A spherical lubricating system in which a solid lubricating film is provided on one or both of the sliding surfaces, and the outer ring is divided into two outer ring divided bodies arranged in the axial direction, and both outer ring divided bodies are integrally connected by fastening parts. bearing. 4. The spherical plain bearing according to claim 3, wherein the two outer ring divided bodies arranged in the axial direction are fitted with each other. 5. The spherical plain bearing according to claim 1, wherein the solid lubricating coating is made of a solid lubricant for vacuum use in outer space. 6. The spherical plain bearing according to claim 1, wherein the outer ring and the inner ring are made of stainless steel.