High-speed thrust bearing bush with polymer coating

Abstract

The invention relates to the technical field of sliding bearings, and provides a high-speed thrust bearing bush with a polymer coating, the high-speed thrust bearing bush comprises a bearing bush body, a composite coating is arranged on the surface, in contact with a thrust disc, of the bearing bush body, the composite coating is composed of a bonding bottom layer and a working surface layer, and the bonding bottom layer is located between the bearing bush body and the working surface layer. The bearing bush body is made of steel, the bonding bottom layer is made of tin-based bearing alloy, the tin-based bearing alloy is used for improving the friction compliance, the embedding property and the running-in property of the bearing bush body, and the working surface layer is made of a high polymer material. By spraying the composite coating on the contact surface of the bearing bush body and the thrust disc, the overall bonding resistance and wear resistance of the bearing bush body can be improved, the bonding bottom layer is made of tin-based bearing alloy, the friction compliance, embedding performance and running-in performance of the bearing bush body can be improved, and the working surface layer on the outer side is made of a high polymer material and can assist in lubrication; friction heating of the high-speed bearing is reduced, and coking and carbonization of lubricating oil caused by too high oil temperature are prevented.

Description

Technical Field

[0001] The invention relates to the technical field of sliding bearings, and in particular to a high-speed thrust bearing bush with a polymer coating. Background Art

[0002] In mechanical transmission systems, high-speed bearings are key components that support rotating shafts, transmit torque, and reduce friction and wear. With the rapid development of industrial technology, the performance requirements for high-speed bearings are increasing, especially under high speed, high load and harsh working conditions. The wear resistance, heat resistance, lubrication performance and service life of bearings have become key factors restricting the overall performance of equipment.

[0003] Traditional thrust bearings are mostly made of babbitt alloys, copper-based alloys, etc. Although these materials have certain load-bearing capacity and wear resistance, in high-speed operation, due to the instability of the lubricating oil film, the bearing and the thrust plate will have solid contact. When the load is relatively large and the speed is relatively high, a lot of heat will be generated at the contact point, resulting in welding. At this time, if the thrust plate and the bearing continue to move relative to each other, material adhesion and migration will occur on the surface of the bearing. In addition, the heat generated by the friction of the high-speed bearing will cause the oil temperature to be too high, resulting in coking and carbonization of the lubricating oil, and even cause the bearing to fail, affecting the stable operation of the equipment. In addition, during the running-in process, the changes in the surface microstructure of the metal bearing are difficult to control, which may cause greater initial wear and affect the service life.

[0004] In order to overcome the above problems, researchers began to explore the application of composite coating technology on the surface of bearings, by coating one or more layers of coatings with different properties on the metal substrate to improve the tribological properties of the bearings. Among them, polymer materials have become one of the most promising candidate materials in composite coatings due to their excellent lubricity, wear resistance and thermal stability. The polymer coating can form a lubricating film between the bearing and the thrust plate, effectively reducing the friction coefficient and wear rate, while reducing the heat generated by friction, and improving the heat dissipation performance and service life of the bearing. However, the bonding strength between the simple polymer coating and the metal substrate is often insufficient, making it difficult to withstand the complex stress under high-speed operation and prone to peeling. Therefore, it is necessary to provide a high-speed thrust bearing with a polymer coating to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a high-speed thrust bearing with a polymer coating, aiming to solve the problems mentioned in the background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a high-speed thrust bearing with a polymer coating, comprising a bearing body, wherein the surface of the bearing body in contact with the thrust plate is provided with a composite coating, wherein the composite coating is composed of a bonding bottom layer and a working surface layer, and the bonding bottom layer is located between the bearing body and the working surface layer.

[0007] As a further solution of the present invention, the bearing body is made of steel, the bonding bottom layer is a tin-based bearing alloy, the tin-based bearing alloy is used to increase the friction compliance, embeddability and running-in properties of the bearing body, the working surface layer is a polymer material, the polymer material is used to assist lubrication and reduce frictional heat generation of high-speed bearings, and the polymer material is polytetrafluoroethylene or polyetheretherketone.

[0008] As a further solution of the present invention, the bonding bottom layer is evenly distributed on the surface where the bearing body contacts the thrust plate, and the working surface layer is evenly distributed on the surface of the bonding bottom layer.

[0009] As a further solution of the present invention, the bonding bottom layer is connected to the surface of the bearing body by casting.

[0010] As a further solution of the present invention, the bearing body and the bonding bottom layer are machined together, cleaned, degreased and dried together, and then the bearing body and the bonding bottom layer are preheated together.

[0011] As a further solution of the present invention, the working surface layer is coated on the surface of the bonding base layer, wherein the coating is thermal spraying.

[0012] As a further solution of the present invention, the bearing body, the bonding bottom layer and the working surface layer are cured.

[0013] In summary, the beneficial effects of the present invention are:

[0014] By spraying a composite coating on the surface of the bearing body in contact with the thrust plate, the overall anti-adhesion and wear resistance of the bearing body can be improved. The bonding bottom layer is a tin-based bearing alloy, which can increase the friction compliance, embedding and running-in of the bearing body. The outer working surface layer is a polymer material, which can assist in lubrication, reduce the friction and heat generation of high-speed bearings, and prevent the lubricating oil from coking and carbonizing due to excessive oil temperature. The present invention can effectively improve the friction reduction and wear resistance of the bearing through the provision of a composite coating, thereby increasing the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0016] Figure 1 The figure is a schematic structural diagram of a high-speed thrust bearing with a polymer coating according to an embodiment of the present invention.

[0017] Figure 2 The present invention is a schematic diagram of the structure of a composite coating in a high-speed thrust bearing with a polymer coating according to an embodiment of the present invention.

[0018] Figure numerals: 1-bearing body, 2-composite coating, 3-bonding base layer, 4-working surface layer. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0021] See also Figure 1 and Figure 2 A high-speed thrust bearing with a polymer coating provided by an embodiment of the present invention includes a bearing body 1, and a composite coating 2 is provided on the surface of the bearing body 1 that contacts the thrust plate. The composite coating 2 is composed of a bonding bottom layer 3 and a working surface layer 4. Spraying the composite coating 2 on the surface of the bearing body 1 that contacts the thrust plate can improve the overall anti-adhesion and wear resistance of the bearing body 1. The bonding bottom layer 3 is located between the bearing body 1 and the working surface layer 4.

[0022] In an embodiment of the present invention, the bearing body 1 is made of steel, the bonding bottom layer 3 is a tin-based bearing alloy, the tin-based bearing alloy is used to increase the friction compliance, embeddability and running-in properties of the bearing body 1, and the working surface layer 4 is a polymer material, which is used to assist lubrication and reduce frictional heat generated by high-speed bearings, thereby preventing the oil temperature from being too high and causing coking and carbonization of the lubricating oil.

[0023] In the embodiment of the present invention, the bonding bottom layer 3 is evenly distributed on the surface where the bearing body 1 contacts the thrust plate, and the working surface layer 4 is evenly distributed on the surface of the bonding bottom layer 3 .

[0024] In the embodiment of the present invention, the polymer material is polytetrafluoroethylene or polyetheretherketone, wherein polytetrafluoroethylene is a polymer obtained by polymerization of tetrafluoroethylene as a monomer, with the chemical formula (C2F4)n, excellent heat resistance and cold resistance, can be used for a long time at -180 to 260°C, and has the characteristics of acid and alkali resistance and resistance to various organic solvents. At the same time, polytetrafluoroethylene has the characteristics of high temperature resistance, and its friction coefficient is extremely low and has good lubrication properties, which can reduce the friction coefficient and wear rate. Polyetheretherketone (PEEK) is a high-performance thermoplastic with extremely high wear resistance, chemical resistance and heat resistance; it can maintain excellent mechanical properties and dimensional stability at high temperatures, and is suitable for bearing coatings under extreme working conditions; PEEK also has good lubrication properties, which can reduce friction and wear.

[0025] In the embodiment of the present invention, the bonding bottom layer 3 is connected to the surface of the bearing body 1 by casting. After the bearing body 1 and the bonding bottom layer 3 are machined together, they are cleaned, degreased and dried together, and then the bearing body 1 and the bonding bottom layer 3 are preheated together. The working surface layer 4 is coated on the surface of the bonding bottom layer 3, wherein the coating is thermal spraying. The bearing body 1, the bonding bottom layer 3 and the working surface layer 4 will be cured.

[0026] In the embodiment of the present invention, the manufacturing process of the high-speed thrust bearing with polymer coating is as follows:

[0027] Step S1, bonding the bottom layer 3 to the bearing body 1 by casting;

[0028] Step S2, the bearing body 1 and the bonding bottom layer 3 are machined together;

[0029] Step S3, the bearing body 1 and the bonding bottom layer 3 are cleaned, degreased and dried together;

[0030] Step S4, preheating the bearing body 1 and the bonding bottom layer 3 together;

[0031] Step S5, coating the working surface layer 4 on the bonding bottom layer 3, wherein the coating is thermal spraying, and the coating needs to be uniform;

[0032] Step S6, curing the bearing body 1, the bonding bottom layer 3 and the working surface layer 4;

[0033] Step S7, inspect and sort the bearing body 1, the bonding bottom layer 3 and the working surface layer 4 to ensure that the product is qualified.

[0034] The working principle of the embodiment of the present invention is as follows: first, spraying the composite coating 2 on the surface of the bearing body 1 in contact with the thrust plate can improve the overall anti-adhesion and wear resistance of the bearing body 1, the bonding bottom layer 3 is a tin-based bearing alloy, which can increase the friction compliance, embedding and running-in of the bearing body 1, and the outer working surface layer 4 is a polymer material, which can assist in lubrication, reduce the friction and heat generation of high-speed bearings, and prevent the lubricating oil from coking and carbonizing due to excessive oil temperature. The present invention can effectively improve the friction reduction and wear resistance of the bearing through the provision of the composite coating 2, thereby increasing the service life.

[0035] For those skilled in the art, although several embodiments and examples of the present invention are described, these embodiments and examples are presented as examples and are not intended to limit the scope of the invention. These new embodiments can be implemented in various other ways, and various omissions, substitutions, and changes can be made without departing from the scope of the subject matter of the invention. These embodiments and their variations are included in the scope and subject matter of the invention, and are included in the invention described in the claims and the scope of their equivalents.

[0036] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A high-speed thrust bearing with a polymer coating, comprising a bearing body (1), characterized in that: The surface of the bearing body (1) in contact with the thrust plate is provided with a composite coating (2), the composite coating (2) being composed of a bonding bottom layer (3) and a working surface layer (4), the bonding bottom layer (3) being located between the bearing body (1) and the working surface layer (4).

2. The high-speed thrust bearing with polymer coating according to claim 1, characterized in that: The bearing body (1) is made of steel, the bonding bottom layer (3) is a tin-based bearing alloy, the tin-based bearing alloy is used to increase the friction compliance, embedding and running-in properties of the bearing body (1), the working surface layer (4) is a polymer material, the polymer material is used to assist lubrication and reduce frictional heat generation of high-speed bearings, and the polymer material is polytetrafluoroethylene or polyetheretherketone.

3. The high-speed thrust bearing with polymer coating according to claim 2, characterized in that: The bonding bottom layer (3) is evenly distributed on the surface where the bearing shell body (1) contacts the thrust plate, and the working surface layer (4) is evenly distributed on the surface of the bonding bottom layer (3).

4. The high-speed thrust bearing with polymer coating according to claim 1, characterized in that: The bonding bottom layer (3) is connected to the surface of the bearing shell body (1) by casting.

5. The high-speed thrust bearing with polymer coating according to claim 4, characterized in that: After the bearing body (1) and the bonding bottom layer (3) are machined together, they are cleaned, degreased and dried together, and then the bearing body (1) and the bonding bottom layer (3) are preheated together.

6. The high-speed thrust bearing with polymer coating according to claim 5, characterized in that: The working surface layer (4) is coated on the surface of the bonding base layer (3), wherein the coating is performed by thermal spraying.

7. The high-speed thrust bearing with polymer coating according to claim 6, characterized in that: The bearing body (1), the bonding bottom layer (3) and the working surface layer (4) are subjected to a curing treatment.

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