A sliding bearing sheet with a modified polyimide

Abstract

A sliding bearing plate with modified polyimide includes a substrate layer, a transition layer, and a coating. The transition layer is located between the substrate layer and the coating. The transition layer covers the surface of the substrate layer and forms a bonding structure on the transition layer. The bonding structure is a mesh or through holes. Compared with the prior art, this invention simplifies the processing by setting a bonding structure on the surface of the transition layer. Furthermore, by creating an uneven bonding surface, the mesh or through holes in the bonding structure have a greater depth and a larger area ratio, resulting in stronger adhesion when the coating is applied. Additionally, the surface treatment of the bonding structure of the transition layer can be adjusted according to product specifications to achieve a more stable and effective bonding area.

Description

Technical Field

[0001] This utility model relates to the field of sliding bearing technology, and in particular to a sliding bearing plate with modified polyimide. Background Technology

[0002] A self-lubricating sliding bearing is a mechanical component that has a self-lubricating function, requiring no additional lubricating oil or grease. Its working principle relies on the inherent properties of the bearing material itself for lubrication; typically, solid lubricants such as graphite or molybdenum disulfide are pre-added to the material. These lubricants form a lubricating film during bearing operation, effectively reducing friction and extending the bearing's service life.

[0003] Existing self-lubricating sliding bearings are manufactured using a method that involves setting a copper powder sintered layer on a steel substrate, followed by a plastic layer on top of the copper powder sintered layer. For example, Chinese invention publication CN102345678B mentions a three-layer composite self-lubricating sliding bearing with a modified polyimide wear-resistant layer and its manufacturing method. This involves sintering a layer of porous spherical bronze powder on one surface of a steel plate. The key feature is that a layer of modified polyimide wear-resistant material is then coated onto the porous spherical bronze powder layer to form a self-lubricating sliding bearing plate. This plate is then processed using conventional methods to create a bushing-shaped sliding bearing, bearing bush, thrust washer, sliding plate, friction disc, or ball seat structure. The manufacturing process includes: preparation of modified polyimide paste, sintering of copper powder, preparation, coating, sintering of modified polyimide, precision rolling, cutting, and forming. This invention possesses excellent properties such as good rigidity, high strength, high temperature resistance, wear resistance, and lead-free characteristics, making it particularly suitable for heavy-load, variable-load, and high-PV-value sliding bearings.

[0004] This invention employs a copper powder sintering process. On the one hand, the process flow is relatively complex. On the other hand, the bonding strength of the copper powder layer is often affected by the quality of the process. For example, the thickness and particle size of the copper powder layer will affect its bonding effect with the coating. Therefore, the product manufacturing process is difficult and the production efficiency is poor. At the same time, the products produced cannot be used in sliding bearings with heavy loads, variable loads, and high PV values ​​due to the poor bonding force of the coating. Summary of the Invention

[0005] In view of this, the present invention provides a sliding bearing plate with modified polyimide to solve the above-mentioned technical problems.

[0006] A sliding bearing plate with modified polyimide includes a substrate layer, a transition layer disposed on the substrate layer, and a coating disposed on the transition layer. The transition layer is located between the substrate layer and the coating. The transition layer covers the surface of the substrate layer and forms a bonding structure on the transition layer. The bonding structure is a mesh or through-holes. The depth of the mesh or the depth of the through-holes are equal to the thickness of the transition layer, and the total area of ​​the mesh or through-holes accounts for 60% to 70% of the total area of ​​the transition layer. The coating is disposed on the side of the transition layer away from the substrate layer and covers the bonding structure of the transition layer by layering.

[0007] Furthermore, the substrate layer is a steel substrate.

[0008] Furthermore, the transition layer is formed by applying copper or aluminum as a metal cladding layer onto the substrate layer.

[0009] Furthermore, the cross-sectional shape of the grid in the transition layer is V-shaped, or a trapezoidal groove with stronger bonding force.

[0010] Furthermore, the through-holes in the transition layer have a circular or rhomboid shape.

[0011] Furthermore, the coating is applied to the bonding structure of the transition layer by scraping, brushing, or spraying, and is continuously applied and smoothed.

[0012] Compared with existing technologies, the modified polyimide sliding bearing plate provided by this utility model simplifies the processing by setting a bonding structure on the surface of the transition layer. This bonding structure creates an uneven bonding surface with a deep mesh or through-holes covering a large area, resulting in stronger adhesion during coating application. Therefore, the coating is less prone to detachment during product use, making the resulting product particularly suitable for heavy-load, variable-load, and high-PV-value sliding bearings. Furthermore, the surface treatment of the bonding structure in the transition layer can be adjusted according to product specifications to achieve a more stable and effective bonding. By using modified polyimide to create the coating, leveraging the high temperature resistance, high strength, and high stability of this special material, the produced sliding bearing simultaneously possesses excellent properties such as good rigidity, high strength, high temperature resistance, and friction resistance. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the cross-sectional structure of a sliding bearing plate with modified polyimide provided by this utility model in a vertical section.

[0014] Figure 2 for Figure 1 A top view schematic diagram of one type of transition layer in a sliding bearing plate with modified polyimide.

[0015] Figure 3 for Figure 1 Another top view schematic diagram of the transition layer in a sliding bearing plate with modified polyimide. Detailed Implementation

[0016] The specific embodiments of this utility model are described in further detail below. It should be understood that the description of the embodiments of this utility model herein is not intended to limit the scope of protection of this utility model.

[0017] like Figures 1 to 3 The diagram shown is a structural schematic of the sliding bearing plate with modified polyimide provided by this utility model. The sliding bearing plate with modified polyimide includes a substrate layer 10, a transition layer 20 disposed on the substrate layer 10, and a coating layer 30 disposed on the transition layer 20. It is conceivable that the sliding bearing plate with modified polyimide also includes other functional modules such as the connecting structure at the edge of the plate, oil injection holes, etc., which are technologies known to those skilled in the art and will not be described in detail here.

[0018] The substrate layer 10 can be a steel substrate as the basis for setting the transition layer 20 and the coating layer 30. Since steel has the advantages of good rigidity and high strength, the resulting composite material can obtain better resistance to elastic deformation and fracture resistance. It can also be made into a bushing-shaped sliding bearing or a bearing bush, thrust washer, slide plate and other structural parts according to actual use requirements.

[0019] The transition layer 20 is located between the substrate layer 10 and the coating layer 30. It can be made of copper or aluminum as a metal cladding layer on the substrate layer 10, so that the substrate layer 10 and the transition layer 20 form a single-sided composite board made by copper or aluminum cladding process. The copper or aluminum cladding process itself is an existing technology, such as hot-dip galvanizing, electrophoresis and vacuum evaporation, etc. It should be a common technology in the field of industrial production, and is not the main content of this application. Therefore, it is only briefly described here.

[0020] After the transition layer 20 covers the surface of the substrate layer 10, a bonding structure is formed on the transition layer 20. In this embodiment, the bonding structure of the transition layer 20 is formed by mechanical processing to create a grid or through holes on the transition layer 20, thereby improving the bonding force between the transition layer 20 and the coating 30. The depth of the grid or the depth of the through holes in the transition layer 20 are equal to the thickness of the transition layer 20, and the total area of ​​the grid or through holes accounts for 60% to 70% of the total area of ​​the transition layer. This results in stronger bonding force for the coating 30 disposed on the transition layer 20, preventing the coating 30 from easily detaching during product use.

[0021] The size and shape of the mesh or through-holes formed by the transition layer 20 can be adjusted according to the actual specifications and requirements of the product. For example, the cross-sectional shape of the mesh can be a conventional V-shape or a trapezoidal groove with stronger bonding force, and the shape of the through-holes includes, but is not limited to, circles, rhombuses, etc., without specific restrictions.

[0022] The coating 30 is disposed on the side of the transition layer 20 away from the substrate layer 10. It is applied to the bonding structure of the transition layer 20 by layering, that is, the paste-like material is applied to the bonding structure of the transition layer 20 by scraping, brushing, and spraying. The coating is continuously applied and smoothed, thereby ensuring that the coating 30 is uniformly distributed and that the coating 30 is fully bonded to the bonding structure of the transition layer 20 and is not easy to detach. This method is suitable for sliding bearings with heavy loads and variable loads.

[0023] The coating 30 can be a coating made of modified polyimide material. By utilizing the advantages of special materials such as high temperature resistance, high strength, and high stability, the surface of the sliding bearing plate with the coating 30 has high wear resistance and excellent high temperature resistance.

[0024] Polyimide (PI), as a special engineering material, has been widely used in aerospace, microelectronics, nanotechnology, liquid crystal, separation membrane, laser and other fields. It has good high temperature resistance and excellent mechanical properties. For example, Chinese invention patent CN115926615A discloses a high wear-resistant polyimide enameled wire enamel and its preparation method, which mentions a scheme to improve the wear resistance of polyimide by modifying it.

[0025] Compared with existing technologies, the modified polyimide sliding bearing plate provided by this utility model, through the setting of a bonding structure on the surface of the transition layer 20, not only simplifies the processing technology but also creates an uneven bonding surface. Furthermore, the mesh or through-holes in this bonding structure have a greater depth and larger area ratio, resulting in stronger bonding force when the coating 30 is applied. Therefore, the coating 30 is less prone to detachment during product use, making the resulting product particularly suitable for heavy-load, variable-load, and high-PV-value sliding bearings. Simultaneously, the surface treatment of the bonding structure of the transition layer 20 can be adjusted according to product specifications to achieve a more stable and effective bonding interface. By setting the coating 30 and using modified polyimide to create the coating, leveraging the advantages of special materials such as high temperature resistance, high strength, and high stability, the produced sliding bearing simultaneously possesses excellent properties such as good rigidity, high strength, high temperature resistance, and friction resistance.

[0026] The above are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Any modifications, equivalent substitutions or improvements within the spirit of the present utility model are covered within the scope of the claims of the present utility model.

Claims

1. A sliding bearing sheet material having a modified polyimide, characterized by: The modified polyimide sliding bearing plate includes a substrate layer, a transition layer disposed on the substrate layer, and a coating disposed on the transition layer. The transition layer is located between the substrate layer and the coating, and covers the surface of the substrate layer. A bonding structure is formed on the transition layer, which is a mesh or through-hole. The depth of the mesh or the depth of the through-hole is equal to the thickness of the transition layer, and the total area of ​​the mesh or through-hole accounts for 60% to 70% of the total area of ​​the transition layer. The coating is disposed on the side of the transition layer away from the substrate layer and covers the bonding structure of the transition layer by a layered coating method.

2. The sliding bearing plate with modified polyimide as described in claim 1, characterized in that: The substrate layer is a steel substrate.

3. The sliding bearing plate with modified polyimide as described in claim 1, characterized in that: The transition layer is formed by applying copper or aluminum as a metal cladding layer onto the substrate layer.

4. The sliding bearing plate with modified polyimide as described in claim 1, characterized in that: The cross-sectional shape of the grid in the transition layer is V-shaped, or it is a trapezoidal groove with stronger bonding force.

5. The sliding bearing plate with modified polyimide as described in claim 1, characterized in that: The through-holes in the transition layer are circular or rhomboid in shape.

6. The sliding bearing plate with modified polyimide as described in claim 1, characterized in that: The coating is applied to the bonding structure of the transition layer by scraping, brushing, and spraying processes, and is continuously applied and smoothed.

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