Self-lubricating knuckle bearing composed of duplex stainless steel and copper alloy

Abstract

The utility model relates to the technical field of bearings, in particular to a self-lubricating joint bearing consisting of duplex stainless steel and copper alloy, which comprises a bearing outer ring, a bearing inner ring is arranged in the bearing outer ring in a penetrating manner, and the surface of the bearing inner ring is in interference fit with the inner wall surface of the bearing outer ring. A groove is formed in the outer wall surface of the bearing inner ring, the groove is of a circular groove structure, a solid lubricant is inserted into the groove, and the surface of the solid lubricant is in interference fit with the inner wall surface of the groove. The self-lubricating knuckle bearing composed of the duplex stainless steel and the copper alloy embedded with the solid lubricant has better corrosion resistance than a common knuckle bearing. The duplex stainless steel of the outer ring of the knuckle bearing has high chromium and molybdenum content, so that the duplex stainless steel has high overall corrosion resistance to organic acids such as formic acid and acetic acid, and also has high corrosion resistance to inorganic acids, especially inorganic acids containing chlorides. And the copper alloy of the inner ring also has better corrosion resistance.

Description

Technical Field

[0001] The utility model relates to the technical field of bearings, in particular to a self-lubricating spherical bearing composed of duplex stainless steel and copper alloy. Background Art

[0002] Bearings are a key mechanical component used to support rotating or sliding parts, reduce friction and transmit loads. Bearings are usually used to support shafts and other rotating parts to ensure the smooth operation of the machine and improve its efficiency. Bearings can be divided into many types according to different designs and applications.

[0003] The choice of bearing depends on the specific application scenario, including factors such as load size, direction, speed, operating temperature, vibration and corrosion. The correct bearing selection can greatly improve the performance and life of mechanical equipment.

[0004] Spherical bearings are mechanical components that allow objects to move in multiple directions. They are usually used to connect two parts so that they can rotate or swing relative to each other.

[0005] Spherical plain bearings can accommodate axial and radial loads and provide smooth movement over a wide angular range.

[0006] Spherical bearings are widely used in the fields of automobiles, aerospace, robotics, industrial equipment, etc. They play a vital role in realizing various complex movements of mechanical equipment.

[0007] Many of the spherical bearings inlaid with solid lubricants on the market are spherical bearings made of bearing steel and copper alloy inlaid with solid lubricants. Bearing steel has a certain corrosion resistance, but in some occasions, there are higher requirements for the corrosion resistance of spherical bearings. Spherical bearings usually made of bearing steel materials are difficult to meet harsh environmental requirements. Utility Model Content

[0008] The utility model aims to solve the above-mentioned shortcomings in the prior art and proposes a self-lubricating spherical bearing composed of duplex stainless steel and copper alloy.

[0009] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0010] A self-lubricating spherical bearing composed of duplex stainless steel and copper alloy is designed, comprising a bearing outer ring, a bearing inner ring is arranged inside the bearing outer ring, and the surface of the bearing inner ring is interference fit with the inner wall surface of the bearing outer ring, a groove is arranged on the outer wall surface of the bearing inner ring, and the groove is a circular groove structure, a solid lubricant is inserted into the groove, and the surface of the solid lubricant is interference fit with the inner wall surface of the groove, an exhaust groove is arranged on the outer wall surface of the solid lubricant, and the exhaust groove is a strip structure, a bump is welded on the inner wall surface of the groove, a built-in groove is arranged at the bottom of the solid lubricant, and the surface of the bump is inserted into the inside of the built-in groove by interference fit.

[0011] In detail, the bearing outer ring is made of high-performance duplex stainless steel 2507 material.

[0012] In detail, the bearing inner ring is made of copper alloy material.

[0013] In detail, the exhaust groove is a channel structure and is arranged parallel to the axis of the groove.

[0014] In detail, the solid lubricant is a cylindrical block structure, and the interference with the groove is 0.02-0.1 mm.

[0015] The design scheme proposed by the utility model has the following beneficial effects during application:

[0016] 1. A self-lubricating spherical plain bearing composed of duplex stainless steel and copper alloy inlaid with solid lubricant has better corrosion resistance than ordinary spherical plain bearings. The higher chromium and molybdenum content of the duplex stainless steel in the outer ring of the spherical plain bearing makes it have strong overall corrosion resistance to organic acids such as formic acid and acetic acid, and it also has strong corrosion resistance to inorganic acids, especially those containing chlorides. The copper alloy of the inner ring also has good corrosion resistance.

[0017] 2. During the use of duplex stainless steel and self-lubricating spherical plain bearings inlaid with solid lubricants, the solid lubricant can be transferred to the surface of the friction pair to form a solid lubricating film, which effectively separates the direct contact of metal components. It has a low friction coefficient and a small wear rate, so the service life of the spherical plain bearing is longer. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the inner ring of the bearing of the utility model;

[0020] Figure 3 It is an enlarged schematic diagram of point a of the utility model;

[0021] Figure 4 This is a schematic diagram of the distribution of the solid lubricant and the exhaust groove of the utility model;

[0022] Figure 5 It is a front cross-sectional schematic diagram of the utility model;

[0023] Figure 6 It is an enlarged schematic diagram of point b of the utility model.

[0024] In the figure: 1. outer ring of bearing; 2. inner ring of bearing; 3. groove; 4. solid lubricant; 5. exhaust groove; 6. built-in groove; 7. bump. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0026] Reference Figure 1-Figure 6 A self-lubricating spherical plain bearing composed of duplex stainless steel and copper alloy, comprising a bearing outer ring 1, a bearing inner ring 2 is arranged inside the bearing outer ring 1, the bearing outer ring 1 is made of high-performance duplex stainless steel 2507 material, and the bearing inner ring 2 is made of copper alloy material. The spherical plain bearing has both high load-bearing capacity and good corrosion resistance, and the surface of the bearing inner ring 2 is interference-fitted with the inner wall surface of the bearing outer ring 1, and a groove 3 is opened on the outer wall surface of the bearing inner ring 2, and the groove 3 is a circular groove structure;

[0027] A solid lubricant 4 is inserted into the groove 3. The solid lubricant 4 is a cylindrical block structure, and the interference with the groove 3 is 0.02-0.1 mm, and the surface of the solid lubricant 4 is interference-fitted with the inner wall surface of the groove 3;

[0028] An exhaust groove 5 is provided on the outer wall surface of the solid lubricant 4, and the exhaust groove 5 is a strip structure. A bump 7 is welded on the inner wall surface of the groove 3. An internal groove 6 is provided at the bottom of the solid lubricant 4, and the surface of the bump 7 is inserted into the internal part of the internal groove 6 by interference fit.

[0029] It should be further explained that the exhaust groove 5 is a channel structure and is arranged parallel to the axis of the groove 3 .

[0030] Working method: The outer ring matrix of the self-lubricating spherical plain bearing composed of duplex stainless steel and copper alloy inlaid with solid lubricant is made of high-performance duplex stainless steel 2507. After forging, it is heat-treated and annealed, and then roughly processed into a bearing blank. After rough turning, it is solution treated. The temperature of the solution treatment is 1150-1200℃ and maintained for a long enough time to dissolve the soluble components into the matrix. It is cooled at a faster rate so that the components that may precipitate from the matrix have no time to precipitate and are still solid-dissolved in the matrix in a supersaturated state. In this way, the duplex stainless steel has a relatively ideal duplex structure with an α / γ ratio of about 50 / 50, and its hardness is between HRC29-32. It is further fine-turned and ground to the finished product size required by the drawing.

[0031] The inner ring matrix of the self-lubricating spherical plain bearing composed of duplex stainless steel and copper alloy inlaid with solid lubricant is made of ZCuA l9Fe4N i4Mn2 copper alloy. It is rough-turned after casting and semi-finished on the spherical surface after completion.

[0032] Drill blind holes on the semi-finished copper alloy inner ring substrate of the spherical bearing. Select solid lubricants with an interference fit of 0.02-0.10 mm between the holes. Use a rubber hammer to knock the prepared solid lubricants into the holes.

[0033] Since it is a blind hole inlay, the exhaust groove should be made. After one-time inlay is completed, effective exhaust treatment is required for 24 hours. After the exhaust treatment, solid lubricant is knocked again to make it more firmly and reliably embedded in the hole.

[0034] The inner ring of the self-lubricating spherical plain bearing is made of duplex stainless steel and copper alloy inlaid with solid lubricants. The solid lubricant on the inner ring can be transferred to the surface of the friction pair during use to form a solid lubricating film, which effectively separates the direct contact of metal components.

[0035] The inner ring and the outer ring of the spherical plain bearing are matched and processed to meet the clearance matching requirements, so as to manufacture a self-lubricating spherical plain bearing composed of duplex stainless steel and copper alloy inlaid with solid lubricant.

[0036] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A self-lubricating spherical plain bearing composed of duplex stainless steel and copper alloy, comprising a bearing outer ring (1), characterized in that: The inner ring (2) of the bearing is penetrated by the inner ring (1), and the surface of the inner ring (2) is interference-fitted with the inner wall of the outer ring (1). The outer wall of the inner ring (2) is provided with a groove (3), and the groove (3) is a circular groove structure. A solid lubricant (4) is inserted into the inner wall of the groove (3), and the surface of the solid lubricant (4) is interference-fitted with the inner wall of the groove (3). The outer wall of the solid lubricant (4) is provided with an exhaust groove (5), and the exhaust groove (5) is a strip structure. A convex block (7) is welded on the inner wall of the groove (3). The bottom of the solid lubricant (4) is provided with a built-in groove (6), and the surface of the convex block (7) is inserted into the inner wall of the built-in groove (6) by interference fit.

2. The self-lubricating spherical plain bearing composed of duplex stainless steel and copper alloy according to claim 1, characterized in that: The bearing outer ring (1) is made of high-performance duplex stainless steel 2507 material.

3. The self-lubricating spherical plain bearing composed of duplex stainless steel and copper alloy according to claim 1, characterized in that: The bearing inner ring (2) is made of copper alloy material.

4. The self-lubricating spherical plain bearing composed of duplex stainless steel and copper alloy according to claim 1, characterized in that: The exhaust groove (5) is a channel structure and is arranged parallel to the axis of the groove (3).

5. The self-lubricating spherical plain bearing composed of duplex stainless steel and copper alloy according to claim 1, characterized in that: The solid lubricant (4) is in the form of a cylindrical block, and the interference with the groove (3) is 0.02-0.1 mm.

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