Interface sliding coating bearing

Abstract

The utility model provides an interface sliding coating bearing, which comprises a bearing part, a bearing part, a bearing part and a bearing part, the bearing part comprises an outer ring and an inner ring, and the inner ring is arranged on the radial inner side of the outer ring; the rolling body is positioned between the outer ring and the inner ring; the composite coatings are arranged on the surface, facing the rolling body, of the outer ring, the surface, facing the rolling body, of the inner ring and the surface of the rolling body; wherein the composite coating comprises a fluorinated diamond-like coating and a molybdenum disulfide coating, and the fluorinated diamond-like coating and the molybdenum disulfide coating are sequentially arranged on the face, facing the rolling body, of the outer ring; the fluorinated diamond-like coating and the molybdenum disulfide coating are sequentially arranged on the face, facing the rolling body, of the inner ring. The fluorinated diamond-like coating and the molybdenum disulfide coating are sequentially arranged on the surface of the rolling body. According to the embodiment of the utility model, the effects of low friction, long service life, low noise and excellent heat dissipation can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of bearings, in particular to an interface slip coating bearing. Background Art

[0002] In modern mechanical engineering, as one of the key components, the performance of bearings directly affects the operation efficiency and reliability of equipment. Especially for mechanical shaft joint bearings, they need to operate stably for a long time under high load, high speed and complex working environments. However, there are still some deficiencies in the existing bearing lubrication technologies: Insufficient wear resistance: Traditional lubricating materials are prone to wear under high load and high speed conditions, resulting in bearing failure and shortened service life. Limited corrosion resistance: When bearings work in corrosive environments such as humidity and salt spray, traditional materials are difficult to provide effective protection and are prone to corrosion damage. High friction coefficient: The existing lubricating materials have a high friction coefficient, leading to increased energy consumption and reduced operation efficiency of equipment.

[0003] In recent years, diamond-like carbon (DLC) coatings have received wide attention due to their high hardness and low friction coefficient. However, there is still room for improvement in the wear resistance and corrosion resistance of single DLC coatings. Summary of the Utility Model

[0004] In order to improve at least some of the above-mentioned disadvantages or deficiencies, an embodiment of the utility model provides an interface slip coating bearing, which realizes low friction through the combined action of a fluorinated diamond-like carbon coating and a molybdenum disulfide coating, reduces energy loss and wear, and improves system efficiency. Due to the high wear resistance and self-lubricating mechanism of the composite coating, the service life of the bearing can be extended, and due to the smooth contact and self-lubricating effect of the composite coating, the vibration and noise caused by friction are reduced.

[0005] On the one hand, an interface slip coating bearing provided by an embodiment of the utility model includes a bearing component, including an outer ring and an inner ring, the inner ring is arranged radially inside the outer ring; rolling elements, located between the outer ring and the inner ring; and a composite coating, the surface of the outer ring facing the rolling elements, the surface of the inner ring facing the rolling elements and the surface of the rolling elements are all provided with the composite coating; wherein, the composite coating includes a fluorinated diamond-like carbon coating and a molybdenum disulfide coating, the fluorinated diamond-like carbon coating and the molybdenum disulfide coating are sequentially arranged on the surface of the outer ring facing the rolling elements; the fluorinated diamond-like carbon coating and the molybdenum disulfide coating are sequentially arranged on the surface of the inner ring facing the rolling elements; the fluorinated diamond-like carbon coating and the molybdenum disulfide coating are sequentially arranged on the surface of the rolling elements.

[0006] In one embodiment, the thickness of the composite coating is 16 nanometers - 21 nanometers.

[0007] In one embodiment, the Vickers hardness of the composite coating is HV2100.

[0008] In one embodiment, the thickness of the fluorinated diamond-like carbon coating is 11.28 nm - 16.77 nm.

[0009] In one embodiment, the fluorinated diamond-like carbon coating is a diamond-like carbon coating with a fluorine content of 5% - 7%.

[0010] In one embodiment, the thickness of the molybdenum disulfide coating is 4.23 nm - 4.72 nm.

[0011] In one embodiment, the molybdenum disulfide coating includes multiple layers of molybdenum disulfide coatings, and the thickness of each layer of the molybdenum disulfide coating is 0.61 nm - 0.64 nm.

[0012] In one embodiment, the interlayer distance between every two adjacent layers of the molybdenum disulfide coatings is 1.2 nm - 1.4 nm.

[0013] In one embodiment, the bearing component further includes a cage, the cage is located between the outer ring and the inner ring, and the rolling elements are distributed on the cage; the composite coating is also provided on the surface of the cage.

[0014] As can be seen from the above, the above technical features of the present utility model can have one or more of the following beneficial effects: low friction is achieved through the combined action of the fluorinated diamond-like carbon coating and the molybdenum disulfide coating, energy loss and wear are reduced, and the system efficiency is improved. Due to the high wear resistance and self-lubricating mechanism of the composite coating, the service life of the bearing can be extended, and due to the smooth contact and self-lubricating effect of the composite coating, the vibration and noise caused by friction are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0016] Figure 1 FIG. is a three-dimensional structural schematic diagram of an interface slip coating bearing provided by an embodiment of the present utility model.

[0017] Figure 2 FIG. is another structural schematic diagram of an interface slip coating bearing provided by an embodiment of the present utility model.

[0018] Figure 3 For Figure 1Schematic diagram of the structure of the outer and inner rings, rolling elements, and composite coating.

[0019] Figure 4 For Figure 1 Schematic diagram of the structure of the inner ring, rolling elements, and composite coating.

[0020]

Reference Numerals

[0021] 10. Bearing component; 101. Outer ring; 102. Inner ring; 103. Cage; 20. Rolling element; 30. Composite coating; 301. Fluorinated diamond-like carbon coating; 302. Molybdenum disulfide coating. Detailed Implementation Manner

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0023] As Figure 1 , Figure 3 , Figure 4 shown, an interface slip coating bearing provided by an embodiment of the present invention includes a bearing component 10, rolling elements 20, and a composite coating 30. The bearing component 10 includes an outer ring 101 and an inner ring 102, and the inner ring 102 is disposed radially inside the outer ring 101. The rolling elements 20 are located between the outer ring 101 and the inner ring 102, and a composite coating 30 is provided on one side of the outer ring 101 facing the rolling elements 20, one side of the inner ring 102 facing the rolling elements 20, and the surface of the rolling elements 20. Among them, the composite coating 30 includes a fluorinated diamond-like carbon coating 301 and a molybdenum disulfide coating 302. The fluorinated diamond-like carbon coating 301 and the molybdenum disulfide coating 302 are sequentially provided on one side of the outer ring 101 facing the rolling elements 20, the fluorinated diamond-like carbon coating 301 and the molybdenum disulfide coating 302 are sequentially provided on one side of the inner ring 102 facing the rolling elements 20, and the fluorinated diamond-like carbon coating 301 and the molybdenum disulfide coating 302 are sequentially provided on the surface of the rolling elements 20. Among them, the fluorinated diamond-like carbon coating 301 (i.e., F-DLC) is a coating formed by introducing fluorine into diamond-like carbon (DLC), and the molybdenum disulfide coating 302 is a coating using molybdenum disulfide nanoparticles MoS2 nanoparticles (i.e., MoS2 nanoparticles) as the main component.

[0024] Specifically, the above composite coating 30 can be prepared through the following steps:

[0025] In the pre - treatment stage, the outer ring 101, inner ring 102 and the surface of the rolling elements 20 are thoroughly cleaned, including ultrasonic cleaning, solvent cleaning and drying, to ensure that the surface is free of oil, dust and oxides. Then, surface roughening treatment is carried out, using mechanical sandblasting and chemical etching to increase the surface roughness and activity. The surface roughness (Ra) is, for example, 5μm. Subsequently, surface passivation treatment is carried out, using dilute acid for passivation treatment and thorough rinsing to eliminate the residual active substances on the surface.

[0026] In the preparation stage of the composite coating 30, physical vapor deposition technology (PVD) is used to control the composition of the reaction gas and deposition parameters to form the required coating structure, namely the composite coating 30:

[0027] In the first step, the fluorine source is evaporated in a vacuum environment, and etching cleaning is carried out using an ion source and argon gas (i.e., Ar gas) to ensure that the surfaces of the outer ring 101, inner ring 102 and the rolling elements 20 are clean and free of impurities. The working current of the ion source is 0.2A, the working power is 200 - 350W, and the negative bias voltage of the substrate is 100V.

[0028] Furthermore, the outer ring 101, inner ring 102 and the rolling elements 20 are placed in a PECVD reaction chamber (plasma - enhanced chemical vapor deposition), and the vacuum is pumped to less than 0.1Pa. Using a high - purity graphite target, carbon tetrafluoride gas is introduced into the reaction chamber, and a radio - frequency (RF) power source is used to generate plasma in the reaction chamber to promote gas decomposition and deposition on the substrate surface to pre - prepare a fluorine - containing diamond - like solid phase. Adjust the reaction gas flow rate, power, substrate temperature (for example, 300 - 500°C) and deposition time (for example, 30 - 120 minutes) to control the thickness of the fluorinated diamond - like coating 301. Among them, the magnetron sputtering target power is, for example, 0.9 - 1.6KW, the working current is, for example, 1.5 - 3A, and the carbon tetrafluoride gas flow rate is, for example, 4.5 - 42sccm.

[0029] Furthermore, an evaporation source containing molybdenum disulfide nanoparticles (i.e., self - lubricating nanoparticles) is introduced, and the molybdenum disulfide nanoparticles are covered on the fluorinated diamond - like coating 301 through PVD technology (physical vapor deposition technology) to form a nanoscale molybdenum disulfide coating 302. The molybdenum disulfide coating 302 is stacked on the surface of the fluorinated diamond - like coating 301 in a layered microcrystalline structure and finally forms the composite coating 30. Among them, it is necessary to control the deposition rate and the distribution density of the nanoparticles to ensure the uniform distribution of the molybdenum disulfide nanoparticles. The deposition rate is, for example, 0.2 nanometers per second, and the distribution density is, for example, 100 particles per square micrometer. The molybdenum disulfide coating 302 has solid self - lubricating properties, which can further reduce friction and enhance lubrication durability.

[0030] Through the above process steps, the application effect of the composite coating 30 on the high-speed bearing can be ensured to meet the expectations, and higher performance and service life can be achieved. The achieved effects include low friction, long life, low noise, and excellent heat dissipation. The low friction is achieved through the combined action of the fluorinated diamond-like carbon coating 301 and the molybdenum disulfide coating 302, reducing energy loss and wear and improving system efficiency. The long life benefits from the high wear resistance and self-lubricating mechanism of the composite coating 30, which can extend the service life of the bearing. The low noise is mainly attributed to the smooth contact and self-lubricating effect of the composite coating 30, reducing vibration and noise caused by friction.

[0031] In one embodiment, the thickness of the composite coating 30 is 16 nanometers - 21 nanometers (nm). By controlling the deposition time, FIS coating samples with different thicknesses (10nm, 13nm, 16nm, 19nm, 21nm, 24nm, 27nm) were prepared, and the friction and wear tests were carried out on each coating sample using a ball-on-disk friction tester. The specific performance is as follows: when the coating thickness is 10nm and 13nm, the wear rates are 10.5×10⁻ 6 mm³ / Nm and 18.2×10⁻ 6 mm³ / Nm respectively, showing relatively high coating wear. In the range of 16nm - 21nm, the wear rate decreases significantly. The coatings with thicknesses of 16nm, 19nm, and 21nm are 4.3×10⁻ 6 mm³ / Nm, 2.7×10⁻ 6 mm³ / Nm and 2.5×10⁻ 6 mm³ / Nm respectively, showing relatively low wear rates. When the coating thickness increases to 24nm and 27nm, the wear rates increase again, being 5.8×10⁻ 6 mm³ / Nm and 7.1×10⁻ 6 mm³ / Nm respectively. It can be seen from the above that an appropriate coating thickness can provide effective wear protection. An overly thin coating is prone to wear, while an overly thick coating has increased internal stress and is prone to peeling, resulting in wear. Experiments show that when the coating thickness is 16 - 21 nanometers, the wear rate is relatively low.

[0032] In one embodiment, the Vickers hardness of the composite coating 30 is HV2100. This high hardness mainly comes from the DLC matrix, and the fluorine doping further optimizes the performance.

[0033] In one embodiment, the thickness of the fluorinated diamond-like carbon coating 301 is 11.28nm - 16.77nm.

[0034] In one embodiment, the fluorinated diamond-like carbon coating 301 is a diamond-like carbon coating with a fluorine content of 5% - 7%. By regulating the flow rate of the fluorine source gas during the PVD process, samples of the fluorinated diamond-like carbon coating 301 with fluorine doping concentrations of 3%, 5%, 7% and 10% were prepared respectively, and their friction coefficients and wear resistance were tested. Fluorine doping at a relatively low concentration of 3% cannot significantly reduce the friction coefficient, while too high a concentration of 10% will cause a decrease in the hardness of the fluorinated diamond-like carbon coating 301, thereby reducing the wear resistance. Fluorine elements play a role in reducing the surface energy in the DLC matrix, thereby reducing the friction coefficient, but excessive doping will weaken the hardness of the fluorinated diamond-like carbon coating 301 and affect the wear resistance. Experiments show that when the fluorine doping concentration is 5% - 7%, the fluorinated diamond-like carbon coating 301 has a relatively low friction coefficient (the friction coefficient is, for example, 0.01 - 0.03) and the best wear resistance.

[0035] In one embodiment, the thickness of the molybdenum disulfide coating 302 is 4.23 nm - 4.72 nm. The molybdenum disulfide nanoparticles are covered on the fluorinated diamond-like carbon coating 301 by PVD technology to form the molybdenum disulfide coating 302, and then the composite coating 30 is formed. The molybdenum disulfide coating 302 includes multiple layers of molybdenum disulfide coating 302, and the thickness of each layer of molybdenum disulfide coating 302 is 0.61 nm - 0.64 nm, and the interlayer distance between every two adjacent layers of molybdenum disulfide coating 302 is 1.2 nm - 1.4 nm. The MoS2 is a layered structure, and these layers interact with each other through van der Waals forces. The thickness of the molybdenum disulfide coating 302 is 4.23 nm - 4.72 nm, preferably 4.515 nm. The binding between molybdenum atoms and sulfur atoms is strong, while the binding between sulfur atoms and sulfur atoms is weak, resulting in a plane with a low shear force formed between sulfur atoms and sulfur atoms. The molybdenum disulfide coating 302 includes, for example, 3 molecular layers (i.e., the molybdenum disulfide coating 302) and 2 layers of low-shear planes (i.e., the gaps between every two adjacent layers of molybdenum disulfide coating 302). Each layer of molybdenum disulfide coating 302 consists of a molybdenum atom layer sandwiched between two sulfur atom layers (S-Mo-S), forming a sandwich structure. This layered structure enables molybdenum disulfide to have excellent lubrication performance when sliding between layers.

[0036] Specifically, the thickness range of a single layer of molybdenum disulfide coating 302 is 0.61 nm to 0.64 nm, and the ideal thickness is 0.625 nm. If the single layer thickness is too large, the coating may become uneven, affecting the mechanical properties of the coating. If the single layer thickness is too small, the coating may become too fragile and the wear resistance will decrease.

[0037] The distance range between every two adjacent molybdenum disulfide coatings 302 is 1.2 nm - 1.4 nm, and the ideal interlayer distance is 1.32 nm. If the interlayer distance is too large, the interlayer force weakens, which may lead to the instability of the coating structure and affect the lubrication performance. If the interlayer distance is too small, the interlayer interaction increases, the friction during movement increases, and the lubrication effect decreases. By precisely controlling these parameters, the lubrication performance and wear resistance of the coating can be optimized to achieve the goals of low friction and high durability.

[0038] As Figure 2 shown, in one embodiment, the bearing component 10 further includes a cage 103. The cage 103 is located between the outer ring 101 and the inner ring 102, and the rolling elements 20 are distributed on the cage 103. A composite coating 30 is also provided on the surface of the cage 103. Specifically, a fluorinated diamond-like carbon coating 301 is provided on the surface of the cage 103, and the molybdenum disulfide coating 302 is provided on the side of the fluorinated diamond-like carbon coating 301 away from the cage 103. Under high-speed, high-load, and high-temperature working conditions, the cage 103 is also a key part of friction and wear. Therefore, coating treatment in these parts is of great significance for improving the overall performance of the bearing. By providing the composite coating 30 on the cage 103, the friction coefficient is further reduced, and the overall lubrication effect and service life of the bearing are improved. The bearing is fully covered with the composite coating 30, achieving low-friction contact between various parts of the bearing, reducing the generation of frictional heat, improving the heat dissipation performance, and enhancing the thermal conductivity of the bearing, enabling the heat generated during operation to be dissipated more effectively and preventing the temperature from rising too high.

[0039] In the embodiment of the present utility model, the composite coating 30 is coated on the surfaces of the outer ring 101, the inner ring 102, and the rolling elements 20 through PVD technology to ensure that the composite coating 30 adheres to the surfaces of the outer ring 101, the inner ring 102, and the rolling elements 20 in a high-speed and high-stress environment, providing interface slip and low-friction protection. During the operation of the bearing in the application scenario, the low-friction characteristics and interface slip effect of the fluorinated diamond-like carbon coating 301 reduce the friction during startup and lower the adhesion force between the rollers and the inner and outer rings. The molybdenum disulfide coating 302 can maintain a continuous lubrication effect.

[0040] This composite coating 30 combines a DLC matrix with high hardness and low friction with self-lubricating molybdenum disulfide nanoparticles, achieving ultra-low friction and high wear resistance in an oil-free dry friction environment, and significantly improving the performance and lifespan of bearings under high-speed, high-temperature, and high-load conditions. Through physical vapor deposition (PVD) and fluorine doping treatment, the composite coating 30 has excellent chemical inertness and heat dissipation performance. By plating the composite coating 30 on the outer ring 101, inner ring 102, cage 103, and roller surfaces, the problem of easy lubrication failure of existing bearings is solved. This utility model has excellent wear resistance, corrosion resistance, and low friction characteristics, significantly improving the service life and operating efficiency, and reducing friction losses. This bearing can be widely applied in fields such as automotive wheels, industrial bearings, aerospace, heavy machinery, high-speed railways, and rail transit.

[0041] In addition, it can be understood that the foregoing various embodiments are only exemplary illustrations of the present utility model. On the premise that the technical features do not conflict, the structures are not contradictory, and the invention purpose of the present utility model is not violated, the technical solutions of the various embodiments can be arbitrarily combined and used.

[0042] In several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there can be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections between each other can be through some interfaces, and the indirect couplings or communication connections of devices or units can be in electrical, mechanical, or other forms.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present utility model.

Claims

1. An interface slip coating bearing, characterized in that, Comprising: A bearing component (10), including an outer ring (101) and an inner ring (102), wherein the inner ring (102) is disposed radially inside the outer ring (101); Rolling elements (20), located between the outer ring (101) and the inner ring (102); and A composite coating (30), provided on one side of the outer ring (101) facing the rolling elements (20), one side of the inner ring (102) facing the rolling elements (20), and the surface of the rolling elements (20); Wherein, the composite coating (30) includes a fluorinated diamond-like carbon coating (301) and a molybdenum disulfide coating (302). On one side of the outer ring (101) facing the rolling elements (20), the fluorinated diamond-like carbon coating (301) and the molybdenum disulfide coating (302) are sequentially provided; on one side of the inner ring (102) facing the rolling elements (20), the fluorinated diamond-like carbon coating (301) and the molybdenum disulfide coating (302) are sequentially provided; on the surface of the rolling elements (20), the fluorinated diamond-like carbon coating (301) and the molybdenum disulfide coating (302) are sequentially provided.

2. The interface slip coating bearing according to claim 1, characterized in that, The thickness of the composite coating (30) is 16 nm - 21 nm.

3. The interface-sliding coating bearing according to claim 1, wherein The Vickers hardness of the composite coating (30) is HV2100.

4. The interface slip coating bearing according to claim 1, wherein, The thickness of the fluorinated diamond-like carbon coating (301) is 11.28 nm - 16.77 nm.

5. The interface slip coating bearing according to claim 4, wherein The fluorinated diamond-like carbon coating (301) is a diamond-like carbon coating with a fluorine content of 5% - 7%.

6. The interfacial slip coating bearing according to claim 1, characterized in that The thickness of the molybdenum disulfide coating (302) is 4.23 nm - 4.72 nm.

7. The interface slip coating bearing according to claim 6, wherein The molybdenum disulfide coating (302) includes multiple layers of molybdenum disulfide coatings (302), and the thickness of each layer of the molybdenum disulfide coating (302) is 0.61 nm - 0.64 nm.

8. The interface slip coating bearing according to claim 7, wherein, The interlayer distance between every two adjacent layers of the molybdenum disulfide coatings (302) is 1.2 nm - 1.4 nm.

9. A kind of interface slip coating bearing according to any one of claims 1-8, characterized in that, The bearing component (10) further includes a cage (103), the cage (103) is located between the outer ring (101) and the inner ring (102), and the rolling elements (20) are distributed on the cage (103); the surface of the cage (103) is also provided with the composite coating (30).

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