JP2012077870A - Spherical sliding bearing and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spherical sliding bearing having a large rocking angle and a manageable fitting gap between an outer ring and inner ring and excellent in sliding properties while capable of being manufactured by a simple manufacturing method, and its manufacturing method.SOLUTION: The spherical sliding bearing 1 is composed of a combination of the inner ring 2 having the spherical outer periphery 2a and the outer ring 5 having concave inner peripheries 3c and 4b which come in contact with the outer periphery 2a. The outer ring 5 includes the outer periphery 3a, one end face 3b, the inner periphery 3c continuing to the end face 3b and axially extending to an axial middle, which belong to the outer ring 5, an outer ring body 3 made of a metal and having an opening 3d on the other end-face side, and an outer ring cover 4 disposed in the opening 3d of the outer ring body 3 and having the other end face 4a of the outer ring 5 and the inner periphery 4b continuing to the end face 4a and axially extending to the axial middle. The inner ring 2, the outer ring body 3, and the outer ring cover 4 are formed into one piece by caulking an outer-periphery opening end 3e of the outer ring body 3 to the outer ring cover 4 under disposition of the inner ring 2 inside the outer ring body 3 and that of the outer ring cover 4 inside the opening 3d of the outer ring body 3 respectively.

Description

  The present invention relates to a spherical plain bearing used for a bearing portion of various industrial machines and a manufacturing method thereof.

  A spherical plain bearing composed of a combination of an inner ring having a spherical outer peripheral surface and an outer ring having a concave spherical surface corresponding to the outer peripheral surface is known and commercially available. A spherical plain bearing has a spherical sliding surface and can be loaded with a radial load and an axial load in both directions, and is suitable for a swinging motion or a centering motion. In particular, synthetic resin spherical plain bearings with inner rings made of synthetic resin are lightweight, inexpensive, and non-lubricated, so various bearing parts (for example, joint bearing parts for office equipment, industrial machinery, etc.) Etc.) is expanding. As a method for manufacturing such a spherical plain bearing, a method is known in which an outer ring formed in advance is charged into a mold and the inner ring is injection-molded (insert molding) (see Patent Document 1).

  Further, in a self-aligning plain bearing having an inner ring having a spherical outer peripheral surface, when the inner ring is assembled to the outer ring, the inner ring is pushed and distorted by the inner ring, and in the assembled state, the distortion is restored and the outer peripheral surface of the inner ring is restored. There is a known one having an outer ring structure that holds the ring (see Patent Document 2). In the bearing, the resin outer ring is composed of an inner peripheral portion on the inner peripheral surface side divided by grooves formed along the circumferential direction of both end surfaces, and an outer peripheral portion on the outer peripheral surface side, and the distortion of the resin is reduced. By using this, assembly of the inner ring to the outer ring is facilitated (such as FIG. 1 of Patent Document 2).

  Further, as a spherical bearing used in a place having a relatively high ambient temperature, there is known a spherical bearing in which an inner ring is slidably fitted to an inner circumference of a metal outer ring via a synthetic resin liner (Patent Document). 3).

Japanese Patent Laid-Open No. 06-280879 JP 2007-100905 A Japanese Patent Laid-Open No. 05-18412

  However, the technique of Patent Document 1 has a problem that uneven wear occurs because the fitting gap with the outer ring becomes too large due to the molding shrinkage of the inner ring. On the other hand, when an inner ring formed in advance is charged into a mold and manufactured by injection molding of the outer ring, there is a problem in that the outer ring is hung on the inner ring and the rotational torque is increased. For this reason, the resin-made spherical plain bearing obtained by the method of patent document 1 was limited to the use in the part where use conditions are loose, such as low rotation and high rotational torque.

  Further, in Patent Document 2, in order to forcibly remove the outer ring made of synthetic resin injected into the mold from the mold, the peripheral edge of the inner peripheral part of the outer ring is smaller than the diameter of the outer peripheral surface of the inner ring, An inner ring introduction surface having a diameter larger than the diameter of the end surface is formed following the spherical surface. For this reason, the arc height of the inner peripheral surface of the outer ring is smaller than the arc height of the outer peripheral surface of the inner ring, and the width of the inner peripheral surface of the outer ring is narrower than the width of the outer ring. Because of such an outer ring structure, there is a problem that the allowable alignment angle is only about 20 °.

  Moreover, since patent document 3 manufactures an outer ring | wheel by die-casting, there exists a problem that processes, such as cooling, are required and manufacture takes a long time. Furthermore, since the synthetic resin liner is exposed to the heat of die casting, a decrease in sliding characteristics due to thermal degradation of the liner is inevitable.

  The present invention has been made to cope with such a problem. Although the present invention can be manufactured by a simple manufacturing method, it has a large swing angle, can manage a fitting gap between an outer ring and an inner ring, and can slide. An object of the present invention is to provide a spherical plain bearing having excellent dynamic characteristics and a method for manufacturing the same.

  The spherical plain bearing of the present invention is a spherical plain bearing comprising a combination of an inner ring having a spherical outer peripheral surface and an outer ring having a concave inner peripheral surface in contact with the outer peripheral surface. An outer peripheral surface, one end surface, and an inner peripheral surface that is connected to the end surface to the center in the axial direction are formed, and a metal outer ring body that has an opening on the other end surface side, and is disposed in the opening of the outer ring main body. An outer ring lid formed with an inner peripheral surface which is connected to the other end surface of the outer ring and connected to the end surface up to an axially central portion, and the inner ring, the outer ring main body, and the outer ring lid are configured so that the inner ring The outer ring lid is integrated with the outer ring lid by crimping the outer peripheral opening end of the outer ring main body with the outer ring lid disposed in the opening of the outer ring main body.

  The axial cross-sectional shape of the inner peripheral surface of the outer ring is V-shaped. The inner ring surface of the inner ring is formed with a bearing hole through which the support shaft can be inserted. The outer ring lid is made of the same material as that of the outer ring main body.

  The inner ring is made of synthetic resin. Further, the synthetic resin forming the inner ring is a lubricating synthetic resin. The inner ring is an injection-molded body of the synthetic resin.

  The outer peripheral surface of the inner ring is characterized in that an aspherical surface portion is formed on the entire circumference of the central portion in the axial direction. Further, a parting line is formed on the aspherical portion.

  The outer peripheral surface of the outer ring is formed in a cylindrical shape that can be inserted into the housing.

  The inner ring is made of metal, and a lubricating coating is formed on the inner peripheral surface of the outer ring. The inner ring is made of metal, and a lubricating coating is formed on the outer peripheral surface of the inner ring. The lubricating coating is a fluororesin coating. In particular, the fluororesin film is a resin film in which a polyamideimide resin is used as a binder resin and a fluororesin powder is blended.

  A method for producing a spherical plain bearing according to the present invention is a method for producing a spherical plain bearing comprising a combination of an inner ring having a spherical outer peripheral surface and an outer ring having a concave inner peripheral surface in contact with the outer peripheral surface. The outer ring is formed with an outer peripheral surface of the outer ring, one end surface, an inner peripheral surface that is connected to the end surface and has an axially central portion, and has an opening on the other end surface side, and the opening of the outer ring main body. And the other end face of the outer ring and an outer ring lid formed with an inner peripheral surface connected to the end face and extending to the axially central part, the manufacturing method includes arranging the inner ring inside the outer ring main body, Next, the outer ring lid is disposed in the opening of the outer ring main body, and includes a step of crimping and integrating the outer peripheral opening end of the outer ring main body with the outer ring lid.

  Before the step of integrating, a step of forming a fluororesin film on the outer peripheral surface of the inner ring or a step of forming a fluororesin film on the inner peripheral surface of the outer ring is characterized.

  Prior to the integrating step, the inner ring includes a step of manufacturing the inner ring by injection molding of a synthetic resin.

  The spherical plain bearing of the present invention is a spherical plain bearing comprising a combination of an inner ring having a spherical outer peripheral surface and an outer ring having a concave inner peripheral surface in contact with the outer peripheral surface. An outer peripheral surface, one end surface, and an inner peripheral surface that is connected to the end surface to the axially central portion are formed, a metal outer ring main body having an opening on the other end surface side, and disposed at the opening of the outer ring main body, The outer ring includes the other end face of the outer ring and an outer ring lid formed with an inner peripheral surface that is connected to the end face and extends to the axially central portion. The inner ring, the outer ring main body, and the outer ring cover include: Since the outer ring body is integrally formed by crimping the outer ring opening end of the outer ring main body to the outer ring lid, the spherical bearing is not required to be insert-molded. The fitting clearance between the inner ring and the outer ring can be managed. For this reason, it becomes a spherical plain bearing which has a managed fitting gap, and problems such as uneven wear do not occur. Moreover, since the outer ring main body is made of metal, it is suitable for use in a high temperature atmosphere.

  By making the axial cross-sectional shape of the inner peripheral surface of the outer ring V-shaped, it becomes easier to manage the fitting gap between the inner ring and the outer ring. In addition, the outer ring can be easily manufactured.

  When the inner ring is made of synthetic resin by forming a bearing hole through which the support shaft can be inserted in the inner peripheral surface of the inner ring, the spherical shape of the outer peripheral surface of the inner ring does not deteriorate due to sink marks.

  By making the outer ring lid made of the same material as that of the outer ring main body, the friction characteristic with the inner ring does not change and rotation unevenness does not occur.

  By making the inner ring made of synthetic resin, there is no need to interpose a resin sheet between the inner ring and the outer ring. In particular, when the synthetic resin is a lubricating synthetic resin, the rotational torque is stably reduced. Moreover, by making the said inner ring into the injection molding body of this synthetic resin, manufacture of an inner ring is easy and the dimensional accuracy between products is excellent.

  In the outer peripheral surface of the inner ring, an aspheric surface part is formed on the entire circumference of the central part in the axial direction. In addition, since the parting line is formed on the aspherical portion, the deburring at the time of injection molding can be simplified, and the manufacture becomes easy.

  By forming the outer peripheral surface of the outer ring into a cylindrical shape that can be fitted into the housing, the incorporation into the housing is excellent.

  In the spherical plain bearing, the inner ring is made of metal, and the lubricating film is formed on the inner peripheral surface of the outer ring or the outer peripheral surface of the inner ring, so that it is suitable for use in a high temperature atmosphere and has excellent sliding characteristics.

  Further, the rotational torque is stably reduced by using a fluororesin film as the lubricating film. In particular, when the fluororesin film is a resin film in which a polyamideimide resin is used as a binder resin and a fluororesin powder is blended, heat resistance and abrasion resistance are further improved.

  In the method of manufacturing a spherical plain bearing according to the present invention, the inner ring is disposed inside the outer ring main body, the outer ring lid is then disposed in the opening of the outer ring main body, and the outer peripheral opening end of the outer ring main body is crimped to the outer ring lid. Therefore, the manufacturing time can be shortened and the manufacturing process can be simplified.

  Before the step of integrating, (1) a step of forming a fluororesin coating on the outer peripheral surface of the inner ring, or (2) a step of forming a fluororesin coating on the inner peripheral surface of the outer ring, Since it is manufactured through an integration process, the coating film is not exposed to high temperatures, and the sliding characteristics are not deteriorated due to thermal degradation. For this reason, a bearing having a low rotational torque can be manufactured stably.

  Before the step of integrating, the inner ring has a step of manufacturing by injection molding of synthetic resin, and then manufactured through the step of unifying, so that the inner ring made of synthetic resin is exposed to high temperature. The sliding characteristics are not deteriorated due to thermal deterioration.

It is a perspective view which shows an example of the spherical plain bearing of this invention. It is an axial sectional view showing an example of a spherical plain bearing of the present invention. It is an axial sectional view showing another example of the outer ring of the spherical plain bearing of the present invention. It is a notch sectional view which shows the other example of the inner ring | wheel of the spherical plain bearing of this invention. It is a figure which shows a state when an inner ring | wheel rock | fluctuates only by an inner ring with a perspective view. It is a figure which shows the manufacturing process of the spherical plain bearing of this invention.

  An embodiment of the spherical plain bearing of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view of a spherical plain bearing of the present invention, and FIG. 2 is an axial sectional view of the spherical plain bearing. As shown in FIGS. 1 and 2, the spherical plain bearing 1 is composed of a combination of an inner ring 2 having a spherical outer peripheral surface 2a and an outer ring 5 having concave inner peripheral surfaces 3c and 4b in contact with the outer peripheral surface 2a. Become.

  The outer ring 5 includes (1) a metal having an outer peripheral surface 3a of the outer ring 5, one end surface 3b, and an inner peripheral surface 3c connected to the end surface 3b and having an axially central portion, and an opening 3d on the other end surface side. An outer ring main body 3 and (2) an outer ring lid that is disposed in the opening 3d of the outer ring main body 3 and is formed with the other end surface 4a of the outer ring 5 and the inner peripheral surface 4b that is connected to the end surface 4a and extends to the central portion in the axial direction. 4 is a two-piece structure. That is, the inner peripheral surface of the outer ring main body 3 constitutes one (half in the axial direction) inner peripheral surface 3c of the outer ring 5, and the inner peripheral surface of the outer ring lid 4 is the other (half in the axial direction) of the outer ring 5. The inner peripheral surface 4b is structured. The inner peripheral surface 3 c and the inner peripheral surface 4 b are surfaces that are symmetrical with respect to the axial center surface of the spherical plain bearing 1.

  The inner ring 2, the outer ring main body 3, and the outer ring lid 4 are arranged such that the inner ring 2 is disposed inside the outer ring main body 3 and the outer ring lid 4 is disposed in the opening 3 d of the outer ring main body 3. 3 are integrated by caulking the outer peripheral opening end 3e. As a manufacturing method (procedure), for example, as will be described later, first, the inner ring 2 is arranged inside the outer ring main body 3, and then the outer ring lid 4 is arranged in the opening 3 d of the outer ring main body 3. Then, the outer peripheral open end 3e of the outer ring main body 3 is crimped and integrated. The outer peripheral opening end 3 e is an end of the outer peripheral surface 3 a of the outer ring main body 3 on the opening 3 d side.

  In the inner ring 2, a bearing hole 6 through which the support shaft can be inserted is formed in the inner peripheral surface 2b. Moreover, the outer peripheral surface 3a of the outer ring 5 is formed in a cylindrical shape that can be fitted into a housing (not shown).

  In the spherical plain bearing 1 shown in FIGS. 1 and 2, the inner peripheral surfaces 3c and 4b of the outer ring 5 are concave spherical surfaces that follow the outer peripheral surface 2a of the inner ring 2, and the axial cross-sectional shape thereof is an arc shape. As another mode, as shown in FIG. 3, the inner peripheral surfaces 3 c and 4 b of the outer ring 5 may be concave surfaces connected by two straight lines like a abacus-like shape. In this case, the axial sectional shape of the inner peripheral surface is V-shaped. When the outer ring 5 is formed by machining, the shape shown in FIG. 3 is preferable to the shape shown in FIGS. 1 and 2 because the manufacturing itself and dimensional management are easier.

  The outer ring 5 has a two-piece structure of the outer ring main body 3 and the outer ring lid 4 as described above, but at least the outer ring main body 3 needs to be made of metal. The outer ring body 3 can be crimped by being made of metal. On the other hand, the outer ring lid 4 may be made of metal or synthetic resin, but is preferably made of metal of the same material as the outer ring main body 3. By using the same material, variations in the fitting gap due to differences in linear expansion coefficient and changes in friction characteristics do not occur and rotation unevenness does not occur.

  The material of the inner ring 2 is not particularly limited, and can be made of a metal such as an aluminum alloy, stainless steel, or steel, a synthetic resin, or a ceramic. If the use atmosphere of the bearing is about 250 ° C. or less, a synthetic resin having heat resistance to the use temperature can be used. In that case, the resin material is selected in consideration of the working surface pressure and the rotational speed. A synthetic resin that can be injection-molded is preferable in terms of managing the fitting gap because it can be easily manufactured and the dimensional accuracy can be made uniform.

  The synthetic resin used for the inner ring 2 is preferably a lubricious synthetic resin. For example, injection moldable fluorine such as polyacetal resin, nylon resin, polytetrafluoroethylene / perfluoroalkyl vinyl ether copolymer resin, tetrafluoroethylene / hexafluoropropylene copolymer resin, ethylene-tetrafluoroethylene copolymer resin, etc. Examples thereof include resins, injection-moldable polyimide resins, polyphenylene sulfide resins, wholly aromatic polyester resins, polyether ether ketone resins, and polyamideimide resins. Each of these resins may be used alone or a polymer alloy in which two or more kinds are mixed. Or the polymer alloy which mix | blended said synthetic resin with the synthetic resin with low lubrication characteristics other than the above may be sufficient.

  Moreover, even a synthetic resin having low lubricating properties can be used by enhancing the lubricating properties by adding a solid lubricant or lubricating oil. Examples of the solid lubricant include polytetrafluoroethylene, graphite, and molybdenum disulfide. In addition, strength may be increased by blending these synthetic resins with glass fiber, carbon fiber, various mineral fibers, and the like.

  When the inner ring 2 is made of metal or ceramics, it is suitable for use in a high-temperature atmosphere, but is inferior in lubrication characteristics (sliding characteristics) with the outer ring sliding surface made of metal. Therefore, in this case, it is preferable to form a lubricant film on one of (1) the outer peripheral surface 2 a of the inner ring 2 and (2) the inner peripheral surfaces 3 c and 4 b of the outer ring 5.

  As the lubricating coating, a fluororesin coating is preferable because the rotational torque is stably reduced. In particular, a fluororesin film obtained by blending a fluororesin powder such as polytetrafluoroethylene (hereinafter referred to as PTFE) resin powder with a polyamideimide resin as a binder resin is preferable because of excellent heat resistance, wear resistance, and lubrication characteristics. Moreover, as PTFE resin powder, since it is excellent in uniform dispersibility and abrasion resistance, the PTFE baking powder which heat-fired PTFE resin above the melting | fusing point is preferable.

  FIG. 4 is a cut-away sectional view showing another example of the inner ring of the spherical plain bearing of the present invention. As shown in FIG. 4, it is preferable to form an aspheric surface portion 2c on the outer peripheral surface 2a of the inner ring 2 around the entire circumference of the axial center portion of the outer peripheral surface 2a. By forming the aspheric surface portion 2c, the inner ring 2 and the outer ring are aligned in the axial direction, and when the inner ring 2 is assembled into the outer ring main body of the outer ring, the inner ring outer diameter is smaller than that without the aspheric surface portion 2c. Is easy to incorporate into the outer ring body. Similarly, the outer ring lid can be easily incorporated into the outer ring main body in which the inner ring 2 is incorporated.

  Further, as shown in FIG. 4, a parting line (PL) which is a seam of the mold divided into two in the radial direction of the aspherical surface portion 2c formed at the axially central portion of the outer peripheral surface 2a of the inner ring 2. 2d is preferably formed. By providing PL in this portion, when the inner ring 2 having the spherical outer peripheral surface 2a is manufactured by injection molding of synthetic resin, injection molding becomes easy, and the protruding shape of the PL does not interfere with the inner peripheral surface of the outer ring. . Therefore, PL polishing can be omitted.

  In the spherical plain bearing 1 of the present invention, the outer ring 5 has a two-piece structure as described above, and the inner ring 2 having a spherical outer peripheral surface is brought into contact with the outer peripheral surface by simple assembly without insert molding or the like. Since the bearing can be combined with the outer ring 5 having the concave inner peripheral surface, the fitting clearance based on the design values of the inner ring 2 and the outer ring 3 can be maintained, and it can operate smoothly without a sense of incongruity during use. Can do. Moreover, problems such as uneven wear do not occur.

  FIG. 5 is a perspective view showing only the inner ring 2 when the inner ring 2 swings. As shown in FIG. 5, in the spherical plain bearing 1 of the present invention, the inner ring 2 slides on the spherical surface, and the inner ring 2 can swing with respect to the outer ring 5. The angle formed by the axial direction of the outer ring 5 and the axial direction of the inner ring 2 is the swing angle (θ). In the spherical plain bearing 1 of the present invention, since the outer ring 5 has the two-piece structure as described above, it can be incorporated into the outer ring 5 manufactured corresponding to any curvature of the outer peripheral surface of the inner ring 2. Also, a large swing angle can be obtained. For example, the swing angle (θ) can be set to 15 to 20 °, and the allowable angle (θ2) at which the inner ring 2 can swing with respect to the outer ring 5 can be set to 30 to 40 °. .

  A method for manufacturing the spherical plain bearing of the present invention will be described with reference to FIG. FIG. 6 is a diagram showing a manufacturing process of the spherical plain bearing. In the manufacturing method, first, the inner ring 2 is arranged inside the outer ring main body 3 (FIGS. 6A and 6B). More specifically, the inner ring 2 contacts the outer peripheral surface 2a of the inner ring 2 and the inner peripheral surface 3c of the outer ring main body 3 from the opening 3d side of the outer ring main body 3 with the axial directions of the inner ring 2 and the outer ring main body 3 aligned. Incorporate Next, the outer ring lid 4 is disposed in the opening 3d of the outer ring main body 3 (FIG. 6C). More specifically, the outer ring main body 3 in which the inner ring 2 is incorporated and the outer ring lid 4 are aligned in the axial direction, and the outer ring cover 4 is fitted into the opening 3 d of the outer ring main body 3 and incorporated. At this time, the outer peripheral surface 2a of the inner ring 2 and the inner peripheral surface 4b of the outer ring lid 4 are in contact with each other. Finally, the outer peripheral open end 3e of the outer ring main body 3 is crimped onto the outer ring lid 4 (FIG. 6D). The inner ring 2, the outer ring main body 3, and the outer ring lid 4 are integrated by the above procedure.

  The method of caulking is not particularly limited. For example, a roller having a surface inclined by 45 ° with respect to the outer peripheral surface 3a can be pressed against the outer peripheral opening end 3e. By the above method, the outer ring main body 3 and the outer ring lid 4 are firmly integrated by caulking the outer ring chamfer (C chamfer) on the end face 4a side of the outer ring cover 4 so as to be covered with the outer peripheral opening end 3e of the outer ring main body 3. The

  Since the manufacturing method of the spherical plain bearing of the present invention includes such a process of incorporation and caulking, the manufacturing time can be shortened and the manufacturing process can be reduced compared to the case of manufacturing the outer ring by die casting. Simplification can be achieved.

  Further, when a lubricating film such as a fluororesin film is formed on the outer peripheral surface 2a of the inner ring 2 or the inner peripheral surfaces 3c and 4b of the outer ring 5, it is performed before the integration step. In the manufacturing method of the spherical plain bearing of the present invention, the integration is performed by the steps of assembling and caulking, and the inner ring and the outer ring are not exposed to high temperature. Even when a lubricating coating is formed on the surface, the sliding characteristics are not deteriorated due to thermal deterioration.

  The spherical plain bearing of the present invention can be manufactured by a simple manufacturing method, has a large swing angle, can manage the fitting gap between the outer ring and the inner ring, and has excellent sliding characteristics. It can be suitably used in various bearing parts such as industrial machines. Moreover, it can utilize suitably also for the use whose atmosphere temperature is comparatively high.

DESCRIPTION OF SYMBOLS 1 Spherical plain bearing 2 Inner ring 2a Outer peripheral surface 2b Inner peripheral surface 2c Aspherical surface part 2d Parting line 3 Outer ring main body 3a Outer peripheral surface 3b End surface 3c Inner peripheral surface 3d Opening 3e Outer peripheral opening end 4 Outer ring lid 4a End surface 4b Inner peripheral surface Outer ring 6 Bearing hole

Claims (18)

A spherical plain bearing comprising a combination of an inner ring having a spherical outer peripheral surface and an outer ring having a concave inner peripheral surface in contact with the outer peripheral surface,
The outer ring includes an outer peripheral surface of the outer ring, one end surface, an inner peripheral surface that is connected to the end surface and has an axial center portion, and has an opening on the other end surface side, and the outer ring main body. An outer ring lid formed with an inner peripheral surface that is connected to the other end surface of the outer ring and connected to the end surface up to the axially central portion,
The inner ring, the outer ring main body, and the outer ring lid are configured such that the inner ring is disposed in the outer ring main body and the outer ring lid is disposed in the opening of the outer ring main body, with respect to the outer ring main body. A spherical plain bearing characterized by being integrated by caulking the outer peripheral opening end of the bearing.   The spherical plain bearing according to claim 1, wherein an axial cross-sectional shape of an inner peripheral surface of the outer ring is V-shaped.   3. A spherical plain bearing according to claim 1, wherein a bearing hole through which a support shaft can be inserted is formed on an inner peripheral surface of the inner ring.   4. The spherical plain bearing according to claim 1, wherein the outer ring lid is made of a metal made of the same material as the outer ring main body.   The spherical plain bearing according to any one of claims 1 to 4, wherein the inner ring is made of a synthetic resin.   6. The spherical plain bearing according to claim 5, wherein the synthetic resin forming the inner ring is a lubricating synthetic resin.   The spherical plain bearing according to claim 5 or 6, wherein the inner ring is an injection molded body of the synthetic resin.   8. The spherical plain bearing according to claim 1, wherein the outer peripheral surface of the inner ring is formed with an aspherical surface at an entire circumference in a central portion in the axial direction.   The spherical plain bearing according to claim 8, wherein a parting line is formed on the aspherical portion.   10. The spherical plain bearing according to claim 1, wherein an outer peripheral surface of the outer ring is formed in a cylindrical shape that can be inserted into a housing.   The spherical plain bearing according to any one of claims 1 to 4, wherein the inner ring is made of metal, and a lubricant film is formed on an inner peripheral surface of the outer ring.   The spherical plain bearing according to any one of claims 1 to 4, wherein the inner ring is made of metal, and a lubricant film is formed on an outer peripheral surface of the inner ring.   The spherical plain bearing according to claim 11 or 12, wherein the lubricating coating is a fluororesin coating.   14. The spherical plain bearing according to claim 13, wherein the fluororesin coating is a resin coating in which a fluororesin powder is blended using a polyamideimide resin as a binder resin. A method for producing a spherical plain bearing comprising a combination of an inner ring having a spherical outer peripheral surface and an outer ring having a concave inner peripheral surface in contact with the outer peripheral surface,
The outer ring is formed with an outer peripheral surface of the outer ring, one end surface, an inner peripheral surface that is connected to the end surface and has an axially central portion, and has an opening on the other end surface side, and the opening of the outer ring main body. An outer ring lid formed on the other end surface of the outer ring and an inner peripheral surface that is connected to the end surface and has an axial center.
In the manufacturing method, the inner ring is arranged inside the outer ring main body, then the outer ring lid is arranged in the opening of the outer ring main body, and the outer peripheral opening end of the outer ring main body is crimped to the outer ring lid to be integrated. The manufacturing method of the spherical plain bearing characterized by having a process to make.   16. The method of manufacturing a spherical plain bearing according to claim 15, further comprising a step of forming a fluororesin film on the outer peripheral surface of the inner ring before the step of integrating.   16. The method of manufacturing a spherical plain bearing according to claim 15, further comprising a step of forming a fluororesin film on the inner peripheral surface of the outer ring before the step of integrating.   The method of manufacturing a spherical plain bearing according to claim 15, 16 or 17, further comprising a step of manufacturing the inner ring by injection molding of a synthetic resin before the step of integrating.

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