Detachable self-lubricating joint bearing and manufacturing method thereof

Abstract

The invention provides a detachable self-lubricating knuckle bearing which comprises an inner ring, a male die outer ring, a female die outer ring and a self-lubricating coating, and the inner ring, the self-lubricating coating, the male die outer ring and the female die outer ring are sequentially arranged from inside to outside. The outer surface of the inner ring comprises a first spherical surface, the inner surface of the male die outer ring comprises a second spherical surface, the inner surface of the female die outer ring comprises a third spherical surface, and the second spherical surface and the third spherical surface are matched with the first spherical surface; the self-lubricating coatings are arranged on the second spherical surface and the third spherical surface; the male die outer ring and the female die outer ring are detachably connected. The bearing comprises the inner ring, the male die outer ring, the female die outer ring and the self-lubricating coating, the outer ring is divided into the male die outer ring and the female die outer ring which are detachably connected, and the combination mode that the inner spherical surface of the outer ring is integrally matched with the outer spherical surface of the inner ring in the prior art is different; the abrasion condition of the self-lubricating coating can be conveniently checked, the lubricating coating material can be conveniently repaired, and the service life of the self-lubricating knuckle bearing is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of spherical plain bearings, and particularly to a detachable self-lubricating spherical plain bearing and a manufacturing method thereof. Background Art

[0002] A self-lubricating spherical plain bearing is a special spherical plain bearing that does not require supplementary lubricant. It has a simple structure, small size, large load-bearing capacity, resistance to impact and corrosion, and has an automatic centering function, suitable for a variety of harsh working conditions, especially widely used in aerospace and national defense weapons. The failure of self-lubricating spherical plain bearings is mainly caused by the self-lubricating liner, and the overload deformation of the inner and outer rings and the uneven assembly clearance of the inner and outer rings directly affect the performance of the liner.

[0003] The prior patent document with the publication number CN110332232A discloses a self-lubricating spherical plain bearing and its method, including a bearing body, the bearing body includes a bearing outer ring (1), a bearing inner ring (2) and multiple sections of self-lubricating liners (3), the bearing outer ring (1), the self-lubricating liner (3) and the bearing inner ring (2) are arranged in sequence from outside to inside; the inner surface of the bearing outer ring (1) is spherical; the outer surface of the bearing inner ring (2) is spherical, and the spherical surface can be surface-treated; the self-lubricating liner (3) is bonded in sections on the inner spherical surface of the bearing outer ring (1).

[0004] The prior patent document with the publication number CN105499298A discloses an extrusion molding die and process for a self-lubricating spherical plain bearing. The inner walls of the upper die cavity and the lower die cavity are both spherical structures. When the upper die moves towards the lower die until the upper die abuts against the lower die, the inner walls of the upper die cavity and the lower die cavity are located on the same spherical surface.

[0005] The self-lubricating spherical plain bearing structure in the prior art solutions has the following deficiencies: the bearing outer ring, the self-lubricating liner and the bearing inner ring are arranged in sequence from outside to inside, the inner spherical surface of the outer ring is integrally matched with the outer spherical surface of the inner ring, and the self-lubricating coating material is attached to the inner spherical surface of the outer ring, thus causing the following effects:

[0006] (1) The requirements for the self-lubricating coating material are relatively strict. During the extrusion and rolling processes of the bearing outer ring, the self-lubricating coating material also needs to bend and deform under high loads, so it needs to have strong load-bearing and anti-deformation capabilities;

[0007] (2) The requirements for the materials of the inner and outer rings of the bearing are relatively strict. The hardness of the inner ring part material should be higher than that of the bearing outer ring material, and the bearing outer ring material needs to have a high yield strength and the hardness cannot be too high, otherwise it is difficult for the outer ring to complete plastic shaping;

[0008] (3) For the production of self-lubricating spherical plain bearings with large diameters or high hardness of the outer ring material, the requirements for equipment such as extrusion and rolling are more stringent. Summary of the Invention

[0009] Aiming at the defects in the prior art, the purpose of the present invention is to provide a detachable self-lubricating spherical plain bearing and its manufacturing method.

[0010] A detachable self-lubricating spherical plain bearing according to the present invention includes an inner ring, a male outer ring, a female outer ring and a self-lubricating coating. The inner ring, the self-lubricating coating, the male outer ring and the female outer ring are arranged in sequence from inside to outside.

[0011] The outer surface of the inner ring includes a first spherical surface, the inner surface of the male outer ring includes a second spherical surface, the inner surface of the female outer ring includes a third spherical surface, and the second spherical surface and the third spherical surface match the first spherical surface.

[0012] The self-lubricating coating is arranged on the second spherical surface and the third spherical surface.

[0013] The male outer ring and the female outer ring are detachably connected.

[0014] Preferably, the male outer ring and the female outer ring are connected by fastening bolts.

[0015] Threaded holes are provided on the circumferential side of the male outer ring, mounting grooves are provided on the circumferential side of the female outer ring, the threaded part of the fastening bolt is connected to the threaded holes, and the head of the fastening bolt is installed in the mounting grooves.

[0016] Preferably, the inner side of the female outer ring includes a first part and a second part. The first part includes a first cylindrical surface, and the second part includes a third spherical surface.

[0017] The outer surface of the male outer ring includes a second cylindrical surface, and the first cylindrical surface matches the second cylindrical surface.

[0018] Preferably, a stepped surface is connected between the first cylindrical surface and the third spherical surface.

[0019] Preferably, the length of the vertical projection of the first cylindrical surface on the rotation axis of the assembly is equal to the length of the vertical projection of the third spherical surface on the rotation axis of the assembly.

[0020] Preferably, a through hole is provided in the middle of the inner ring.

[0021] Preferably, the centers of the first spherical surface, the second spherical surface and the third spherical surface coincide.

[0022] Preferably, the thickness of the self-lubricating coating provided on the second spherical surface is equal to the thickness of the self-lubricating coating provided on the third spherical surface.

[0023] A manufacturing method of a detachable self-lubricating spherical plain bearing provided by the present invention comprises the following steps:

[0024] Step S1: Set a self-lubricating coating on the second spherical surface and the third spherical surface;

[0025] Step S2: Assemble the inner ring and the outer punch ring into the outer die ring in sequence, so that the first spherical surface fits with the second spherical surface and the third spherical surface;

[0026] Step S3: Detachably connect the outer punch ring and the outer die ring.

[0027] Preferably, the first spherical surface, the second spherical surface and the third spherical surface are all machined by turning.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. By setting that the bearing includes an inner ring, an outer punch ring, an outer die ring and a self-lubricating coating, and the outer ring is divided into a detachable outer punch ring and an outer die ring, which is different from the combination mode of the inner spherical surface of the outer ring in one-piece matching with the outer spherical surface of the inner ring in the prior art, it is beneficial to conveniently check the wear condition of the self-lubricating coating and repair the lubricating coating material, and extend the service life of the self-lubricating spherical plain bearing;

[0030] 2. By setting that the bearing includes an inner ring, an outer punch ring, an outer die ring and a self-lubricating coating, and the outer ring is divided into a detachable outer punch ring and an outer die ring, which is different from the combination mode of the inner spherical surface of the outer ring in one-piece matching with the outer spherical surface of the inner ring in the prior art, it is beneficial to produce large-diameter self-lubricating spherical plain bearings;

[0031] 3. By setting that the bearing includes an inner ring, an outer punch ring, an outer die ring and a self-lubricating coating, and the outer ring is divided into a detachable outer punch ring and an outer die ring, which is different from the combination mode of the inner spherical surface of the outer ring in one-piece matching with the outer spherical surface of the inner ring in the prior art, it is beneficial to change the manufacturing methods of the inner and outer rings of the bearing, get rid of the traditional manufacturing methods of extrusion and rolling, and reduce the performance and process requirements for the materials of the inner and outer rings and the self-lubricating coating material;

[0032] 4. By setting that the outer ring includes an outer punch ring and an outer die ring, the shapes of the outer punch ring and the outer die ring match each other and can match with the outer spherical surface of the inner ring, which not only forms an outer ring that is easy to match with the outer spherical surface of the inner ring, but also forms an outer ring that is easy to disassemble, breaking the technical concept of the traditional one-piece outer ring design;

[0033] 5. The manufacturing method of the present invention by setting the turning of the first spherical surface, the second spherical surface and the third spherical surface is beneficial to avoiding the extrusion and roll forming of the self-lubricating spherical plain bearing in the traditional technology, as well as various technical conditions such as process and materials. It can manufacture self-lubricating spherical plain bearings of different materials, different specifications and even larger specifications, further improving the dimensional processing and assembly accuracy of parts, and expanding the selection range and manufacturing methods of the materials for the inner and outer rings and the lubricating coating materials of the self-lubricating spherical plain bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Other features, objects and advantages of the present invention will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0035] Figure 1 Schematic assembly structure diagram mainly showing the self-lubricating spherical plain bearing of the present invention;

[0036] Figure 2 Front view mainly showing the cross-section of the outer ring of the punch along the axial direction of the present invention;

[0037] Figure 3 Side view mainly showing the cross-section of the outer ring of the punch along the axial direction of the present invention;

[0038] Figure 4 Front view mainly showing the cross-section of the outer ring of the die along the axial direction of the present invention;

[0039] Figure 5 Side view mainly showing the cross-section of the outer ring of the die along the axial direction of the present invention.

[0040] As shown in the figure:

[0041] Second cylindrical surface 302 of the inner ring 1

[0042] First spherical surface 101 of the outer ring of the die 4

[0043] Through hole 102 of the third spherical surface 401

[0044] Fastening bolt 2 of the first cylindrical surface 402

[0045] Step surface 403 of the outer ring of the punch 3

[0046] Second spherical surface 301 of the self-lubricating coating 5 DETAILED DESCRIPTION OF THE EMBODIMENTS

[0047] The present invention will be described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0048] As Figure 1 shown, a detachable self-lubricating spherical plain bearing provided by the present invention includes an inner ring 1, a male outer ring 3, a female outer ring 4, and a self-lubricating coating 5. The inner ring 1, the self-lubricating coating 5, the male outer ring 3, and the female outer ring 4 are arranged in sequence from inside to outside. The outer surface of the inner ring 1 includes a first spherical surface 101, the inner surface of the male outer ring 3 includes a second spherical surface 301, and the inner surface of the female outer ring 4 includes a third spherical surface 401. The second spherical surface 301 and the third spherical surface 401 match the first spherical surface 101. The self-lubricating coating 5 is provided on the second spherical surface 301 and the third spherical surface 401. The male outer ring 3 and the female outer ring 4 are detachably connected.

[0049] The detachable self-lubricating spherical plain bearing of the present invention includes an inner ring 1, a male outer ring 3, a female outer ring 4, and a self-lubricating coating 5. Among them, the outer ring is divided into a male outer ring 3 and a female outer ring 4. The outer spherical surface of the inner ring 1 is segmented and attached to the inner spherical surfaces of the male outer ring 3 and the female outer ring 4, which is different from the technical means of directly matching the inner spherical surface of an outer ring in the prior art with the outer spherical surface of the inner ring 1. It can effectively get rid of the restrictions of traditional self-lubricating spherical plain bearing extrusion molding, rolling and other equipment, as well as technical conditions such as processes and materials. In particular, it is suitable for the production and manufacture of larger-sized self-lubricating spherical plain bearings, further expanding the selection range of materials for the inner and outer rings of self-lubricating spherical plain bearings and the self-lubricating coating 5 materials, as well as the manufacturing methods; the detachable connection between the male outer ring 3 and the female outer ring 4 can more conveniently check the wear condition of the self-lubricating coating 5 and repair the lubricating coating material during application, extending the service life of the self-lubricating spherical plain bearing.

[0050] Specifically, the male outer ring 3 and the female outer ring 4 are connected by fastening bolts 2. Threaded holes are provided on the circumferential side of the male outer ring 3, and mounting grooves are provided on the circumferential side of the female outer ring 4. The threaded portion of the fastening bolt 2 is connected to the threaded hole, and the head of the fastening bolt 2 is installed in the mounting groove. Preferably, a plurality of threaded holes and mounting grooves are provided. Any threaded hole corresponds to any mounting groove. The plurality of threaded holes are evenly arranged on the circumferential side of the male outer ring 3, and the plurality of mounting grooves are evenly arranged on the circumferential side of the female outer ring 4. The fastening bolt 2 is preferably a standard part and is set as an internal hexagon. The material of the fastening bolt 2 includes, but is not limited to, metal materials such as stainless steel, aluminum alloy, and titanium alloy, polymer materials such as polyimide and polyether ether ketone, and inorganic non-metallic materials.

[0051] Specifically, a through hole 102 is provided in the middle of the inner ring 1, and the outer surface is the first spherical surface 101. The material of the inner ring 1 includes, but is not limited to, metal materials such as stainless steel, aluminum alloy, and titanium alloy, polymer materials such as polyimide and polyether ether ketone, and inorganic non-metallic materials.

[0052] Specifically, the thickness of the self-lubricating coating 5 provided on the second spherical surface 301 is equal to the thickness of the self-lubricating coating 5 provided on the third spherical surface 401, and the thickness of the self-lubricating coating 5 is in the range of 0.05 mm to 3 mm. The material of the self-lubricating coating 5 includes but is not limited to high molecular materials such as fabric-type self-lubricating pads, molded pads, high molecular weight polyethylene, polyimide, polyether ether ketone, and inorganic non-metallic material coatings.

[0053] Specifically, as Figures 2 to 5 shown, the inner side of the outer die ring 4 includes a first part and a second part. The first part includes a first cylindrical surface 402, and the second part includes a third spherical surface 401. The outer surface of the punch outer ring 3 includes a second cylindrical surface 302. The first cylindrical surface 402 is matched with the second cylindrical surface 302. A stepped surface 403 is connected between the first cylindrical surface 402 and the third spherical surface 401. The length of the vertical projection of the first cylindrical surface 402 on the rotation axis of the assembly is equal to the length of the vertical projection of the third spherical surface 401 on the rotation axis of the assembly. The centers of the first spherical surface 101, the second spherical surface 301, and the third spherical surface 401 coincide, and the point of their coincidence is located on the central axis of the through hole 102.

[0054] A feasible implementation method is as follows:

[0055] The outer side of the punch outer ring 3 is integrally set as the second cylindrical surface 302, and one or more threaded holes are provided on the circumferential side for fixing the fastening bolt 2. A chamfer is provided at the connection between the edge of the punch outer ring 3 and the outer die ring 4. A self-lubricating coating 5 is bonded on the second spherical surface 301 on the inner side of the punch outer ring 3. The material of the punch outer ring 3 includes but is not limited to metal materials such as stainless steel, aluminum alloy, and titanium alloy, high molecular materials such as polyimide and polyether ether ketone, and inorganic non-metallic materials.

[0056] The outer side of the outer die ring 4 is integrally set as the first cylindrical surface 402, and one or more mounting grooves (through holes 102) are provided on the circumferential side for assembling the fastening bolt 2, and the head of the fastening bolt 2 is installed inside the mounting groove. The left half of the inner side of the outer die ring 4 is set as the first cylindrical surface 402, and the right half is set as the third spherical surface 401. A self-lubricating coating 5 is bonded on the third spherical surface 401. A stepped surface 403 is connected between the first cylindrical surface 402 on the left half and the third spherical surface 401 on the right half, so that there is a certain height difference between the first cylindrical surface 402 and the third spherical surface 401. The material of the outer die ring 4 includes but is not limited to metal materials such as stainless steel, aluminum alloy, and titanium alloy, high molecular materials such as polyimide and polyether ether ketone, and inorganic non-metallic materials.

[0057] The present invention also provides a manufacturing method for a detachable self-lubricating spherical plain bearing, including the following steps:

[0058] Step S1: Set a self-lubricating coating 5 on the second spherical surface 301 and the third spherical surface 401;

[0059] Step S2: Assemble the inner ring 1 and the outer punch ring 3 into the outer die ring 4 in sequence, such that the first spherical surface 101 is in contact with the second spherical surface 301 and the third spherical surface 401;

[0060] Step S3: Detachably connect the outer punch ring 3 and the outer die ring 4.

[0061] Among them, the first spherical surface 101, the second spherical surface 301, and the third spherical surface 401 are all processed by turning.

[0062] Generally, the outer die ring 4 is placed on an annular base, then the inner ring 1 is installed, and then the outer punch ring 3 is placed. The fitting tolerance between the outer punch ring 3 and the outer die ring 4 is small, and a rubber rod can be used for appropriate knocking for installation.

[0063] The detachable self-lubricating spherical plain bearing of the present invention adopts different manufacturing methods. Compared with the traditional extrusion and rolling manufacturing methods (taking the patent document CN110332232A as an example for specific description), it has the following advantages:

[0064] 1) In the patent document CN110332232A, the manufacturing process of the outer ring of the bearing is an integral forming extrusion deformation process. The formation of the inner spherical surface of the outer ring requires the use of extrusion and rolling equipment. When the size of the outer ring increases, it is necessary to greatly improve the processing capacity of the extrusion and rolling equipment tonnage. For example, when manufacturing an inner diameter exceeding 65 mm, a press of more than 300T is usually required. When using a larger-tonnage extrusion equipment, during the extrusion forming process, the integrity of the self-lubricating gasket or the solid lubricating coating may be damaged, and the parts of the self-lubricating gasket material or the solid lubricating coating with larger local stress may be crushed. The present invention completely abandons the extrusion forming process route and can complete the processing of the inner spherical surface of the outer ring by using turning equipment, greatly reducing the processing difficulty coefficient.

[0065] 2) In CN110332232A, the spherical surface of the inner surface of the outer ring of the bearing needs to use the spherical surface of the inner ring of the bearing as a mold, and on this basis, the inner spherical surface of the outer ring is formed. Therefore, when processing according to CN110332232A, it is required that the hardness of the material of the inner spherical surface of the inner ring must be high enough and much higher than the hardness of the material of the outer ring. Otherwise, during the extrusion process, it is easy to cause damage or deformation of the inner spherical surface of the inner ring. At the same time, during the extrusion deformation process, the self-lubricating gasket or the solid lubricating coating needs to be deformed from a cylindrical surface to a spherical surface, and the middle stressed part needs to bear a large extrusion force. Therefore, there are relatively high requirements for the load-bearing and deformation capabilities of the self-lubricating gasket or the solid lubricating coating. The present invention has no such strict restrictions on equipment and materials.

[0066] 3) The extrusion deformation process in CN110332232A is an irreversible process, and it is difficult to control the consistency of the radial and axial clearances of the inner and outer rings. During the manufacturing process, generally, the first-piece inspection after extrusion and batch extrusion are required for sampling inspection, and destructive tests are used to verify the clearance consistency. By using the method of the present invention, finish machining can be directly carried out, with high dimensional fit accuracy and good consistency. Moreover, due to the detachable feature, the surface coating or self-lubricating gasket material can be repaired, extending the service life of the bearing.

[0067] Example 1

[0068] The self-lubricating spherical plain bearing is composed of an inner ring 1, fastening bolts 2, a male outer ring 3, a female outer ring 4, and a self-lubricating coating 5. When manufacturing the self-lubricating spherical plain bearing, first, the same self-lubricating coating 5 with a thickness of 0.40 mm and made of PTFE / Nomex woven self-lubricating gasket is evenly set on the third spherical surface 401 of the female outer ring 4 made of stainless steel 05Cr17Ni4Cu4Nb and the second spherical surface 301 of the male outer ring 3 part made of stainless steel 05Cr17Ni4Cu4Nb. Then, the inner ring 1 made of stainless steel G95Cr18 and the male outer ring 3 are assembled into the female outer ring 4 in sequence, so that the first spherical surface 101 of the inner ring 1 fits with the second spherical surface 301 of the male outer ring 3 and the third spherical surface 401 of the female outer ring 4. Then, by installing steel fastening bolts 2, the male outer ring 3 and the female outer ring 4 are connected together to form a complete steel self-lubricating spherical plain bearing.

[0069] Example 2

[0070] The self-lubricating spherical plain bearing is composed of an inner ring 1, fastening bolts 2, a male outer ring 3, a female outer ring 4, and a self-lubricating coating 5. When manufacturing the self-lubricating spherical plain bearing, first, the same self-lubricating coating 5 with a thickness of 0.30 mm and made of ultra-high molecular weight polyethylene is evenly set on the third spherical surface 401 of the female outer ring 4 made of 7075 material and the second spherical surface 301 of the male outer ring 3 part made of 7075 material. Then, the inner ring 1 made of stainless steel 7075 and the male outer ring 3 are assembled into the female outer ring 4 in sequence, so that the first spherical surface 101 of the inner ring 1 fits with the second spherical surface 301 of the male outer ring 3 and the third spherical surface 401 of the female outer ring 4. Then, by installing aluminum fastening bolts 2, the male outer ring 3 and the female outer ring 4 are connected together to form a complete aluminum self-lubricating spherical plain bearing.

[0071] Example 3

[0072] The self-lubricating spherical plain bearing consists of five parts: inner ring 1, fastening bolt 2, male outer ring 3, female outer ring 4, and self-lubricating coating 5. When manufacturing the self-lubricating spherical plain bearing, first, the same self-lubricating coating 5 with a thickness of 0.25 mm and made of molded gasket is evenly set on the third spherical surface 401 of the female outer ring 4 made of polyimide and the second spherical surface 301 of the male outer ring 3 part made of polyimide. Then, the inner ring 1 made of polyimide and the male outer ring 3 are sequentially assembled into the female outer ring 4, so that the first spherical surface 101 of the inner ring 1 fits with the second spherical surface 301 of the male outer ring 3 and the third spherical surface 401 of the female outer ring 4. Then, by installing the fastening bolt 2 made of polyimide, the male outer ring 3 and the female outer ring 4 are connected together to form a complete self-lubricating spherical plain bearing prepared from all composite materials.

[0073] By using a detachable self-lubricating spherical plain bearing and manufacturing method provided by the present invention and comparing with traditional self-lubricating spherical plain bearings and manufacturing methods, it is found that: the present invention avoids the restrictions of various technical conditions such as equipment for extrusion molding and roll pressing of self-lubricating spherical plain bearings, as well as processes and materials in the prior art. By using the detachable self-lubricating spherical plain bearing and manufacturing method of the present invention, self-lubricating spherical plain bearings of different materials, different specifications, and even larger specifications can be manufactured, further improving the dimensional processing and assembly accuracy of parts, expanding the selection range of materials for the inner and outer rings of self-lubricating spherical plain bearings and lubricating coating materials, and manufacturing methods. And during application, the wear condition of the self-lubricating coating 5 can be conveniently inspected and the lubricating coating material can be repaired, prolonging the service life of the self-lubricating spherical plain bearing.

[0074] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0075] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. Without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A detachable self-lubricating spherical plain bearing, characterized in that, It includes an inner ring (1), a punch outer ring (3), a die outer ring (4), and a self-lubricating coating (5). The inner ring (1), the self-lubricating coating (5), the punch outer ring (3), and the die outer ring (4) are arranged in sequence from the inside out. The outer surface of the inner ring (1) includes a first spherical surface (101). The inner surface of the punch outer ring (3) includes a second spherical surface (301). The inner surface of the die outer ring (4) includes a third spherical surface (401). The second spherical surface (301) and the third spherical surface (401) match the first spherical surface (101). The self-lubricating coating (5) is provided on the second spherical surface (301) and the third spherical surface (401). The punch outer ring (3) and the die outer ring (4) are detachably connected.

2. The detachable self-lubricating spherical plain bearing according to claim 1, wherein, The punch outer ring (3) and the die outer ring (4) are connected by a fastening bolt (2). Threaded holes are provided on the circumferential side of the punch outer ring (3). An installation groove is provided on the circumferential side of the die outer ring (4). The threaded portion of the fastening bolt (2) is connected to the threaded hole, and the head of the fastening bolt (2) is installed in the installation groove.

3. The detachable self-lubricating spherical plain bearing according to claim 1, wherein, The inner side of the die outer ring (4) includes a first part and a second part. The first part includes a first cylindrical surface (402), and the second part includes a third spherical surface (401). The outer surface of the punch outer ring (3) includes a second cylindrical surface (302). The first cylindrical surface (402) matches the second cylindrical surface (302).

4. The detachable self-lubricating spherical plain bearing according to claim 3, characterized in that, A stepped surface (403) is connected between the first cylindrical surface (402) and the third spherical surface (401).

5. The detachable self-lubricating spherical plain bearing according to claim 3, wherein The length of the vertical projection of the first cylindrical surface (402) on the rotation axis of the assembly is equal to the length of the vertical projection of the third spherical surface (401) on the rotation axis of the assembly.

6. The detachable self-lubricating spherical plain bearing according to claim 1, wherein A through hole (102) is provided in the middle of the inner ring (1).

7. The detachable self-lubricating spherical plain bearing according to claim 1, characterized in that, The centers of the first spherical surface (101), the second spherical surface (301), and the third spherical surface (401) all coincide.

8. The detachable self-lubricating spherical plain bearing according to claim 1, characterized in that, The thickness of the self-lubricating coating (5) provided on the second spherical surface (301) is equal to the thickness of the self-lubricating coating (5) provided on the third spherical surface (401).

9. A manufacturing method of a detachable self-lubricating spherical plain bearing according to any one of claims 1-8, characterized in that, It includes the following steps: Step S1: Set the self-lubricating coating (5) on the second spherical surface (301) and the third spherical surface (401). Step S2: Sequentially assemble the inner ring (1) and the punch outer ring (3) into the die outer ring (4) so that the first spherical surface (101) fits with the second spherical surface (301) and the third spherical surface (401). Step S3: Detachably connect the punch outer ring (3) and the die outer ring (4).

10. The manufacturing method of the detachable self-lubricating spherical plain bearing according to claim 9, characterized in that, The first spherical surface (101), the second spherical surface (301), and the third spherical surface (401) are all machined by turning.

Images