JP2012082843A - Spherical slide bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spherical slide bearing device of a synthetic resin which is excellent in wear resistance, heat resistance, and a low friction characteristic, capable of securing a large oscillating angle, and can control a fitting clearance between an outer ring and an inner ring.SOLUTION: The spherical slide bearing device 1 is composed of a combination of the inner ring 2, which has a spherical outer circumferential surface 2b and in the inner circumferential surface 2a of which a bearing hole 5 through which a support shaft can be passed is formed, and the outer ring 3, which has a recessed surface 3e corresponding to the outer circumferential surface 2b. The inner ring 2 and outer ring 3 are moldings of a resin composition molded individually. The resin composition that forms the inner ring 2 is made by blending a solid lubricant with a synthetic resin having a melting point of 200°C or more, while the resin composition that forms the outer ring 3 is made by blending a reinforcement material with a synthetic resin having the melting point of 200°C or more. On one end surface of the outer ring 3, claws 3a, 3b, 3c that hold the inner ring 2 so as to be insertable are provided integrally. The claws 3a, 3b, 3c are made up of thin parts provided by slits 4 formed in the circumferential direction of the outer ring end surface.

Description

  The present invention relates to a spherical plain bearing device used for bearing parts of various industrial machines.

  In a spherical plain bearing device comprising a combination of an inner ring having a spherical outer peripheral surface and an outer ring having a concave surface corresponding to the outer peripheral surface, a spherical plain bearing device in which the inner ring and the outer ring are formed of a synthetic resin is well known and marketed. Is available at The spherical plain bearing device has a spherical sliding surface, 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, the above-mentioned spherical sliding bearing device made of synthetic resin is lightweight, inexpensive, and non-lubricated, so demand for various bearing parts (for example, joint bearing parts of office equipment, industrial machines, etc.) is demanded. Is expanding. As a method for manufacturing such a spherical plain bearing device, a method is known in which a pre-molded outer ring is charged into a mold and the inner ring is manufactured by injection molding (insert molding) (see Patent Document 1 and Patent Document 2). ).

  Regarding specific resin materials for these bearings, Patent Document 1 discloses resins having excellent heat resistance, wear resistance, and lubricity (for example, thermosetting resins such as copna resin and polyimide resin, phenol resin, carbon And a resin whose lubricity is improved by adding molybdenum disulfide, etc.). Patent Document 2 discloses that an inner ring is formed of a material (for example, polyacetal, nylon, PET, or the like) that generates molding shrinkage and satisfies good injection moldability and high oil resistance.

  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 3). 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 (FIG. 1 of Patent Document 3).

Japanese Patent Laid-Open No. 06-280879 JP 2008-032050 A JP 2007-100905 A

  However, depending on the application of the sliding bearing, the technique of Patent Document 1 has insufficient wear resistance and lubrication characteristics, and the technique of Patent Document 2 has insufficient wear resistance and heat resistance.

  Further, both of the techniques of Patent Document 1 and Patent Document 2 have 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 contrary, when an inner ring formed in advance is charged into a mold and manufactured by injection molding of the outer ring, the outer ring is hung on the inner ring, and there is a problem that rotational torque increases. For this reason, the spherical plain bearing device obtained by the methods of Patent Document 1 and Patent Document 2 is limited to use in a portion where the use conditions are loose such as low rotation and high rotational torque.

  In addition, as shown in FIG. 1 of Patent Document 3, in order to forcefully remove the outer ring made of a synthetic resin injected into the mold from the mold, the peripheral edge of the inner peripheral portion 14 of the outer ring 10 is An inner ring introduction surface 18 having a diameter smaller than the diameter of the outer peripheral surface 21 of the inner ring 20 and larger than the diameter of the end surface 22 of the inner ring 20 is formed following the spherical surface. For this reason, the arc height of the inner peripheral surface 11 of the outer ring 10 is smaller than the arc height of the outer peripheral surface 21 of the inner ring 20, and the width of the inner peripheral surface 11 of the outer ring 10 is narrower than the width of the outer ring 10. Because of such an outer ring structure, there is a problem that the allowable alignment angle is only about 20 °.

  The present invention has been made to cope with such problems, and is excellent in wear resistance, heat resistance and low friction characteristics, and can secure a large swing angle, and can provide a fitting clearance between the outer ring and the inner ring. It is an object to provide a spherical plain bearing device made of synthetic resin that can be managed.

  The spherical plain bearing device of the present invention is a set of an inner ring having a spherical outer peripheral surface and having an inner ring formed with a bearing hole through which a support shaft can be inserted, and an outer ring having a concave surface corresponding to the outer peripheral surface. A spherical plain bearing device comprising a combination, wherein the inner ring and the outer ring are molded bodies of individually molded resin compositions, and the resin composition for molding the inner ring is a synthetic resin having a melting point of 200 ° C. or higher The resin composition for forming the outer ring is blended with a synthetic resin having a melting point of 200 ° C. or higher, and a reinforcing material is blended.

  The outer ring integrally has at least one end surface of the outer ring integrally with a claw portion that is divided into two or more to hold the inner ring so that the inner ring can be inserted, and the claw portion is formed in a circumferential direction of the outer ring end surface. It consists of the thin part provided by the slit.

  The upper limit of the swing angle, which is an angle formed by the axial direction of the outer ring and the axial direction of the inner ring, is 15 to 20 °.

  The slit is formed on one end face of the outer ring, and the depth of the slit is formed up to the axial center of the outer ring.

  The solid lubricant is an organic powder. In particular, the organic powder is at least one selected from a thermosetting resin powder and a polytetrafluoroethylene (PTFE) resin powder. The reinforcing material is a carbon-based reinforcing material.

  The synthetic resin in the resin composition for molding the inner ring and the synthetic resin in the resin composition for molding the outer ring are different resins. In particular, the synthetic resin in the resin composition for molding the inner ring is a polyphenylene sulfide (PPS) resin, and the synthetic resin in the resin composition for molding the outer ring is a polyamide resin.

  The inner ring and the outer ring are injection molded bodies of the resin composition for molding each of the inner ring and the outer ring.

  The outer peripheral surface of the outer ring is formed in a cylindrical shape that can be inserted into the housing. Further, the outer ring is characterized in that a concave surface corresponding to the outer peripheral surface of the inner ring is formed in the housing.

  The axial cross-sectional shape of the inner peripheral surface of the outer ring is V-shaped.

  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. The inner ring is an injection-molded body of the resin composition that molds the inner ring, and a parting line is formed on the aspherical surface.

  The spherical plain bearing device of the present invention is a set of an inner ring having a spherical outer peripheral surface and having an inner ring formed with a bearing hole through which a support shaft can be inserted, and an outer ring having a concave surface corresponding to the outer peripheral surface. The inner ring and the outer ring are individually molded molded resin compositions, and the resin composition for molding the inner ring is blended with a synthetic resin having a melting point of 200 ° C. or higher and a solid lubricant. Thus, the resin composition for molding the outer ring is excellent in wear resistance, heat resistance, and low friction characteristics because the reinforcing material is blended with a synthetic resin having a melting point of 200 ° C. or higher. Moreover, a fitting clearance can be managed by manufacturing an inner ring and an outer ring separately. Therefore, it becomes a spherical plain bearing device having a controlled fitting gap, and there is no problem such as uneven wear.

  In the outer ring, at least one end face of the outer ring is integrally provided with a claw part divided into two or more parts for holding the inner ring so that the inner ring can be inserted, and the claw part is formed in a circumferential direction of the outer ring end face. By forming the thin portion provided by the slit, it is easy to incorporate the inner ring into the outer ring through the claw portion consisting of the divided thin portion, even when the outer peripheral surface of the inner ring has a large curvature. And it can hold reliably.

  By setting the upper limit of the swing angle that is an angle formed by the axial direction of the outer ring and the axial direction of the inner ring to be 15 to 20 °, it is suitable for joint bearing portions of office equipment, industrial machines, and the like. Become. Even if the upper limit of the swing angle is within this range, the inner ring can be easily incorporated into the outer ring by the above structure.

  The slit is formed on one end face of the outer ring, and the slit has a depth formed up to the central part in the axial direction of the outer ring, so that the strength of the claw part can be sufficiently secured. .

  By using an organic powder as the solid lubricant blended in the resin composition for forming the inner ring, the lubricating properties are excellent and the low friction properties are obtained. In particular, by using at least one selected from thermosetting resin powder and PTFE resin powder, excellent lubrication characteristics and low friction characteristics are obtained without impairing heat resistance.

  By using a carbon-based reinforcing material as the reinforcing material blended in the resin composition for forming the outer ring, a reinforcing effect can be obtained without impairing the low friction characteristics.

  By making the synthetic resin in the resin composition for molding the inner ring different from the synthetic resin in the resin composition for molding the outer ring, adhesion between the inner ring and the outer ring can be prevented. The friction characteristics can be stabilized over time. In particular, the synthetic resin in the resin composition for molding the inner ring is a PPS resin, and the synthetic resin in the resin composition for molding the outer ring is a polyamide resin, so that the wear resistance, heat resistance, and low friction are reduced. Excellent balance of characteristics.

  By using the inner ring and the outer ring as injection-molded bodies of the resin composition for molding the inner ring and the outer ring, matching by a fitting gap is facilitated.

  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. Moreover, the number of parts can be reduced by forming the concave surface corresponding to the outer peripheral surface of the said inner ring | wheel in a housing, and making this into an outer ring | wheel.

  By making the axial cross-sectional shape of the inner peripheral surface of the outer ring V-shaped, the outer ring can be easily designed and manufactured.

  In the outer peripheral surface of the inner ring, an aspheric surface portion is formed on the entire circumference of the central portion in the axial direction. Further, the inner ring is an injection-molded body of the resin composition for molding the inner ring, and the parting line is formed on the aspherical surface, so that the inner ring can be easily injection-molded and the protruding shape of the parting line Does not interfere with the sliding surface of the outer ring.

It is a perspective view which shows an example of the spherical plain bearing apparatus of this invention. It is a perspective view which shows the other example of the spherical plain bearing apparatus of this invention. 3 (a) is a front view showing the spherical plain bearing device of FIG. 2, and FIG. 3 (b) is a cross-sectional view taken along line AA of FIG. 3 (a). It is a front view which shows the other example of the outer ring | wheel of the spherical plain bearing apparatus of this invention. It is an axial sectional view showing another example of the outer ring of the spherical plain bearing device of the present invention. It is a side view which shows the other example of the inner ring | wheel of the spherical plain bearing apparatus of this invention. FIG. 4 is a perspective view showing only the inner ring when the inner ring in FIG.

  An embodiment of the spherical plain bearing device of the present invention will be described with reference to FIG. FIG. 1 is a perspective view showing an example of a spherical plain bearing device of the present invention. As shown in FIG. 1, the spherical plain bearing device 1 has a spherical outer peripheral surface 2b, an inner ring 2 in which a bearing hole 5 through which a support shaft can be inserted is formed in the inner peripheral surface 2a, and the outer peripheral surface 2b. And a combination with the outer ring 3 having the concave surface 3e corresponding to The inner ring 2 and the outer ring 3 are molded articles of resin compositions molded individually. In the inner ring 2 and the outer ring 3 that are individually molded, any method can be adopted as a method for incorporating the inner ring 2 into the outer ring 3. However, since the inner ring is excellent in assemblability and retention, it will be described later (see FIGS. 2 and 3). A method of providing the nail portion is preferable. By manufacturing the inner ring 2 and the outer ring 3 separately, the fitting gap can be managed, and problems such as uneven wear do not occur. In the spherical plain bearing device of the present invention, for example, the outer diameter of the outer ring 3 is about 5 mm to 30 mm.

  Here, (1) the resin composition for molding the inner ring 2 is formed by blending a solid lubricant with a synthetic resin having a melting point of 200 ° C. or higher, and (2) the resin composition for molding the outer ring 3 has a melting point of 200 ° C. or higher. A reinforcing material is blended with the synthetic resin.

  The synthetic resin that is the base resin of the resin composition that forms the outer ring 2 or the inner ring 3 is a synthetic resin having a melting point of 200 ° C. or higher. More preferably, it is a synthetic resin having a melting point of 200 ° C to 400 ° C. Examples of the synthetic resin that can be used in the present invention include polyamide 6 (PA6) resin, polyamide 6-6 (PA66) resin, polyamide 6-10 (PA610) resin, polyamide 6-12 (PA612) resin, and polyamide 4-6. In a polymer main chain such as an aliphatic polyamide resin such as (PA46) resin, polyamide 9-T (PA9T) resin, polyamide 6-T (PA6T) resin, polymetaxylene adipamide (polyamide MXD-6) resin Aromatic (aliphatic aromatic) polyamide resin with aromatic ring, polycarbonate (PC) resin, polyethylene terephthalate (PET) resin, PPS resin, polyetheretherketone (PEEK) resin, thermoplastic polyimide resin “Aurum” (Registered) Trademark), polyamideimide (PAI) resin, polytetrafluoroethylene Examples thereof include a tylene / perfluoroalkyl vinyl ether copolymer (PFA) resin, a tetrafluoroethylene / hexafluoropropylene copolymer (FEP) resin, and an ethylene-tetrafluoroethylene copolymer (ETFE) resin. In each polyamide resin, a number represents the number of carbon atoms between amide bonds, and T represents a terephthalic acid residue. Each of these resins may be used alone or a polymer alloy in which two or more kinds are mixed. Moreover, if it is a synthetic resin which can be injection-molded, the inner ring 2 and the outer ring 3 can be formed into an injection-molded body, which is easy to manufacture and uniform in dimensional accuracy, which is preferable in managing the fitting gap.

  As the synthetic resin serving as the base resin of the resin composition for molding the inner ring 2, it is preferable to use a lubricating resin having excellent sliding characteristics. Examples of such resins include PA6 resin, PA66 resin, PA610 resin, PA612 resin, PPS resin, PEEK resin, thermoplastic polyimide resin “Aurum” (registered trademark), PFA resin, FEP resin, and ETFE. It is preferable to use a resin or the like. Moreover, 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 if it is a synthetic resin with a low lubrication characteristic, a lubrication characteristic can be improved by adding the below-mentioned solid lubricant and lubricating oil.

  The resin composition for molding the inner ring 2 is formed by blending a solid lubricant with the synthetic resin as a base resin. By blending a solid lubricant, the low friction characteristics can be improved without reducing the wear resistance and mechanical strength of the resin molded body. Examples of the solid lubricant that can be used in the present invention include PTFE resin powder, graphite, molybdenum disulfide, thermosetting resin powder such as polyimide resin, phenol resin, and wholly aromatic polyester resin. Among these, organic powders such as PTFE resin powder and thermosetting resin powder are particularly preferable because they have excellent lubrication characteristics and low friction characteristics without impairing heat resistance. These solid lubricants may be blended in one kind or in combination of two or more kinds.

  It is preferable to use a synthetic resin excellent in mechanical strength as the synthetic resin that serves as the base resin of the resin composition for molding the outer ring 3. Examples of such resins include PA6 resin, PA66 resin, PA610 resin, PA612 resin, PA46 resin, PA9T resin, PA6T resin, PC resin, PET resin, PPS resin, PEEK resin, and thermoplastic polyimide resin. “Aurum”, PAI resin or the like is preferably used.

  The resin composition for molding the outer ring 3 is formed by blending a reinforcing material with the above synthetic resin as a base resin. By blending a reinforcing material, the mechanical strength can be increased. Examples of the reinforcing material that can be used in the present invention include glass fiber, carbon fiber, aramid fiber, various mineral fibers (whiskers), and carbon powder. Among these, carbon-based reinforcing materials such as carbon fibers, carbon whiskers, and carbon powder are particularly preferable because they can improve mechanical strength and wear resistance without impairing low friction characteristics. These reinforcing materials may be blended in one kind or in combination of two or more kinds. Further, in the resin composition for molding the outer ring 3, a solid lubricant or the like may be used in combination.

  The synthetic resin that is the base resin of the resin composition that molds the inner ring 2 and the synthetic resin that is the base resin of the resin composition that molds the outer ring 3 are preferably different resins. By using different base resins, adhesion between the inner ring outer peripheral surface and the outer ring inner peripheral surface, which is a sliding surface, can be prevented, and the low friction characteristics can be stabilized over time. When selecting a different base resin, it is preferable that the outer ring is easy to cope with the diameter expansion when the inner ring is fitted and the inner ring is not easily damaged. Therefore, the base resin for the outer ring should be a resin having a lower hardness than the base resin for the inner ring. preferable.

  In the present invention, the inner ring is molded from a PPS resin composition in which PTFE resin powder or thermosetting polyimide resin powder is blended with PPS resin, and the outer ring is molded from a PA resin composition in which polyamide resin is blended with a carbon-based reinforcing material. Thus, a spherical plain bearing device combining these is particularly preferable. With such a combination, a spherical plain bearing device is obtained in which the outer ring can easily cope with the diameter expansion when the inner ring is fitted and the inner ring is hard to be damaged, and furthermore, it has an excellent balance of wear resistance, heat resistance, and low friction characteristics.

  As another embodiment of the spherical plain bearing device of the present invention, a spherical plain bearing device having a claw portion divided into three on the outer ring will be described with reference to FIGS. FIG. 2 is a perspective view showing a spherical plain bearing device having claw portions divided into three parts, FIG. 3A is a front view showing this spherical plain bearing device, and FIG. It is sectional drawing which cut | disconnected 3 (a) by the AA line. As shown in FIG. 2 and FIG. 3, the spherical plain bearing device 1 includes a combination of an inner ring 2 having a spherical outer peripheral surface 2b and an outer ring 3 having a concave surface 3e corresponding to the outer peripheral surface 2b. Has one claw portion 3a, 3b, 3c that holds the inner ring 2 so that the inner ring 2 can be inserted integrally with the outer ring. The inner ring 2 and the outer ring 3 are molded bodies of the above-described resin composition that are individually molded.

  By providing the outer ring 3 with the claw portions 3a, 3b, and 3c formed of such thin portions, the inner ring 2 is attached to the outer ring 3 via the claw portion even when the outer peripheral surface 2b of the inner ring 2 has a large curvature. It is easy to incorporate and can be held securely. The claw portion is preferably 2 or more or 8 or less because it can be incorporated into the inner ring and cannot be easily removed.

  The claw portions 3a, 3b, 3c are formed of thin portions provided by slits 4 formed in the circumferential direction of the outer ring end surface. The slit 4 is formed on one end face of the outer ring 3, and the depth of the slit 4 is preferably formed to the axial center of the outer ring 3 as shown in FIG. By making the depth of the slit to the axial center of the outer ring, the strength of the claw portion can be sufficiently secured.

  As shown in each figure, in the inner ring 2, a bearing hole 5 through which a support shaft can be inserted is formed in the inner peripheral surface 2a. Moreover, the outer peripheral surface 3d of the outer ring 3 is formed in a cylindrical shape that can be inserted into the housing. By adopting such a shape, the incorporation into the housing is excellent. Further, the outer ring 3 may be a housing in which a concave surface corresponding to the outer peripheral surface 2b of the inner ring 2 is formed. That is, as shown in FIG. 4, a concave surface 6 a corresponding to the outer peripheral surface 2 b of the inner ring 2 may be formed directly on the housing 6 without forming the outer ring separately from the housing. In the case of such a configuration, the number of parts can be reduced. In FIG. 4, a claw portion is also formed on the housing 6.

  In the spherical plain bearing device 1, the inner peripheral surface of the outer ring 3 is a concave surface 3 e that follows the outer peripheral surface 2 b of the inner ring 2, and its axial cross-sectional shape is an arc shape except between the claw portions (FIG. 3 ( b)). As another mode, as shown in FIG. 5, the inner peripheral surface of the outer ring 3 may be a concave surface 3e 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 3 is formed by machining, the shape shown in FIG. 5 is easier to design (dimension management) and manufacture than the shape shown in FIG.

  FIG. 6 is a side view showing an example of an inner ring of the spherical plain bearing device of the present invention. As shown in FIG. 6, it is preferable to form an aspherical surface portion 2 c on the outer peripheral surface 2 b of the inner ring 2 on the entire circumference in the axial center portion of the outer peripheral surface. By forming the aspherical portion 2c, the inner ring 2 and the outer ring 3 are aligned in the axial direction of the inner ring 2 and the inner ring 2 in the outer ring 3 in the configuration shown in FIG. The outer diameter is small, and the incorporation of the inner ring 2 into the outer ring 3 is excellent. Further, since the curvature of the outer peripheral surface of the inner ring other than the aspherical surface portion 2c is the same as that without the aspherical surface portion 2c, the inner ring 2 is held by the claw portion of the outer ring 3 with the same accuracy as that without the aspherical surface portion 2c. Is done.

  As shown in FIG. 6, a parting line (PL) 2d, which is a joint of the mold divided into two, is formed in the radial direction of the aspherical surface portion 2c formed in the axial center portion of the outer peripheral surface 2b of the inner ring 2. Preferably it is formed. By providing the PL at this portion, the injection molding of the inner ring 2 having the spherical outer peripheral surface 2b is facilitated, and the protruding shape of the PL does not interfere with the sliding contact surface of the outer ring. Therefore, PL polishing can be omitted.

FIG. 7 is a perspective view showing only the inner ring when the inner ring in FIG. 3B swings. As shown in FIG. 7, in the spherical plain bearing device 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 3. The angle formed by the axial direction of the outer ring 3 and the axial direction of the inner ring 2 is the swing angle (θ). In the spherical plain bearing device 1 of the present invention, the upper limit of the swing angle (θ) is preferably 15 to 20 °. That is, the allowable angle (θ ₂ ) at which the inner ring 2 can swing with respect to the outer ring 3 is preferably 30 to 40 °.

  A manufacturing process of the spherical plain bearing device 1 having the configuration shown in FIG. 2 will be described with reference to FIG. The spherical plain bearing device 1 is manufactured by individually molding the inner ring 2 and the outer ring 3 using the resin composition described above, and then incorporating (fitting) the inner ring 2 into the outer ring 3. Assembling is performed by attaching the inner ring 2 to the claw portions 3 a, 3 b, 3 c of the outer ring 3 and inserting the inner ring 2 into the inner side of the outer ring 3. 3A and 3B, the claw portions 3a, 3b, and 3c of the outer ring 3 have division gaps 3f in the circumferential direction, and the claw portion 3a and the outer peripheral surface 3d of the outer ring 3. Since the slit 4 is formed between the inner ring 2 and the inner ring 2 having an outer diameter larger than the inner diameter of the end face of each claw part, the peripheral edge of each claw part of the outer ring 3 is turned up to the slit 4 side on the outer peripheral surface 2b. In addition, the concave surface 3e of the outer ring 3 is pushed in so as to expand the dividing gap 3f. Further, since the slit 4 and the split gap 3f are not provided on the other end face side of the outer ring 3 having no claw portions, the concave face 3e of the outer ring 3 cannot be expanded on this end face side. It is pushed to the center line in the width direction and cannot be advanced any further, and is positioned. The incorporated inner ring 2 is held by the claw portions 3a, 3b, 3c at one end of the outer ring 3 and the other end.

  The spherical plain bearing device 1 having the structure shown in FIG. 2 and the like has the claw structure divided in this way, so that the upper limit of the swing angle is as large as 15 to 20 ° (allowable angle is 30 to 40 °). Even if the curvature of the outer peripheral surface of the inner ring is large, the inner ring 2 can be easily incorporated into the outer ring 3. Further, since the spherical plain bearing device 1 completed by incorporating the inner ring 2 does not perform insert molding or the like, the fitting clearance based on the respective design values of the inner ring 2 and the outer ring 3 can be maintained, and there is no sense of incompatibility when used. It can operate smoothly. Furthermore, since the inner ring 2 and the outer ring 3 are each molded from a predetermined resin composition, they are excellent in wear resistance, heat resistance, and low friction characteristics.

  The spherical plain bearing device of the present invention is excellent in wear resistance, heat resistance and low friction characteristics, and can secure a large swing angle, and can manage the fitting gap between the outer ring and the inner ring, thereby causing problems such as uneven wear. Since it does not occur, it can be suitably used in various bearing parts such as office equipment, industrial machines, and automobiles.

DESCRIPTION OF SYMBOLS 1 Spherical plain bearing device 2 Inner ring 2a Inner ring inner surface 2b Outer ring surface of inner ring 2c Aspherical surface part 2d Parting line 3 Outer ring 3a, 3b, 3c Claw part 3d Outer ring of outer ring 3e Concave surface of outer ring 3f Dividing gap 4 Slit 5 Bearing hole 6 Housing

Claims (15)

A spherical plain bearing device comprising a combination of an inner ring having a spherical outer peripheral surface and a bearing hole through which a support shaft can be inserted into the inner peripheral surface, and an outer ring having a concave surface corresponding to the outer peripheral surface. And
The inner ring and the outer ring are individually molded resin composition molded bodies,
The resin composition for molding the inner ring is formed by mixing a solid lubricant with a synthetic resin having a melting point of 200 ° C. or higher, and the resin composition for molding the outer ring has a reinforcing material for the synthetic resin having a melting point of 200 ° C. or higher. A spherical plain bearing device characterized by being compounded.   The outer ring integrally has at least one end surface of the outer ring integrally with a claw portion that is divided into two or more to hold the inner ring so that the inner ring can be inserted, and the claw portion is formed in a circumferential direction of the outer ring end surface. 2. A spherical plain bearing device according to claim 1, wherein the spherical plain bearing device comprises a thin portion provided by a slit.   3. The spherical plain bearing device according to claim 1, wherein an upper limit of a swing angle that is an angle formed by an axial direction of the outer ring and an axial direction of the inner ring is 15 to 20 °.   4. The spherical slip according to claim 2, wherein the slit is formed on one end face of the outer ring, and the depth of the slit is formed up to an axially central portion of the outer ring. Bearing device.   The spherical plain bearing device according to any one of claims 1 to 4, wherein the solid lubricant is an organic powder.   6. The spherical plain bearing device according to claim 5, wherein the organic powder is at least one selected from a thermosetting resin powder and a polytetrafluoroethylene resin powder.   The spherical plain bearing device according to any one of claims 1 to 6, wherein the reinforcing material is a carbon-based reinforcing material.   8. The synthetic resin in the resin composition for molding the inner ring and the synthetic resin in the resin composition for molding the outer ring are different resins. The spherical plain bearing device according to one item.   The synthetic resin in the resin composition for molding the inner ring is a polyphenylene sulfide resin, and the synthetic resin in the resin composition for molding the outer ring is a polyamide resin. Item 9. A spherical plain bearing device according to any one of items 8 to 9.   The spherical plain bearing device according to any one of claims 1 to 9, wherein the inner ring and the outer ring are injection-molded bodies of the resin composition for molding the inner ring and the outer ring, respectively.   The spherical plain bearing device according to any one of claims 1 to 10, wherein an outer peripheral surface of the outer ring is formed in a cylindrical shape that can be fitted into a housing.   The spherical plain bearing device according to any one of claims 1 to 11, wherein the outer ring has a housing formed with a concave surface corresponding to the outer peripheral surface of the inner ring.   The spherical plain bearing device according to any one of claims 1 to 12, wherein an axial sectional shape of an inner peripheral surface of the outer ring is V-shaped.   14. The spherical plain bearing device according to claim 1, wherein the outer peripheral surface of the inner ring is formed with an aspherical surface at the entire circumference of the central portion in the axial direction.   The spherical plain bearing device according to claim 14, wherein the inner ring is an injection-molded body of the resin composition that molds the inner ring, and a parting line is formed on the aspherical surface portion.

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