Liquid metal dynamic pressure sliding bearing, groove coating manufacturing method and X-ray tube

Abstract

The application discloses a liquid metal dynamic pressure sliding bearing, a groove coating manufacturing method and an X-ray tube. The sliding bearing comprises a bearing core, a rotating shell arranged outside the bearing core and a liquid metal material arranged between the bearing core and the rotating shell. The rotating shell can rotate around the bearing core. At least a part of the surface of the rotating shell opposite to the bearing core and / or at least a part of the surface of the bearing core opposite to the rotating shell is provided with a plurality of grooves. The edge surface of the groove is provided with a wear-resistant coating composed of a wear-resistant material. The bottom surface and / or the side surface of the groove is provided with a first wetting coating composed of a wetting material.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of X-ray tube, in particular to a liquid metal dynamic pressure sliding bearing, a groove coating manufacturing method and an X-ray tube. BACKGROUND

[0002] In recent years, with the development of modern medical imaging technology and the improvement of medical diagnosis demand, higher requirements are put forward for the performance and service life of the sliding bearing of the X-ray tube. The wettability of the friction surface and the lubricating medium of the sliding lubricated bearing for the rotating anode X-ray tube, and the wear resistance between the friction surfaces, play a crucial role in the overall performance of the bearing, and directly affect the working performance and service life of the X-ray tube.

[0003] In the prior art, there are various methods for improving the performance of the sliding bearing. For example, method 1: by plating gold on the metal surface, the affinity between the liquid metal and the metal surface is improved, and finally the wetting properties of the liquid metal and the metal surface are improved.

[0004] Method 2: by using PVD method on the bearing surface, plating some carbides, borides or nitrides of transition metal elements, so that the wettability between the bearing surface and the lubricating medium is better.

[0005] Method 3: by plating tetrahedral amorphous carbon, molybdenum disulfide, diamond and polycrystalline diamond and other wear-resistant materials on the sliding surface of the bearing, so as to obtain lower sliding friction coefficient and higher wear resistance.

[0006] For method 1 and method 2, by plating film on the bearing surface, etc., the bearing surface can only obtain good wetting properties. However, the wear resistance between the bearing friction surfaces is not significantly improved, which directly restricts the further improvement of the service life of the bearing.

[0007] For method 3, by plating tetrahedral amorphous carbon, molybdenum disulfide, diamond and polycrystalline diamond and other wear-resistant materials on the sliding surface of the bearing, the wear resistance between the sliding surfaces can be improved, but the effect on improving the wettability of the bearing lubricant and the friction surface is general. In addition, method 3 also achieves the effect of simultaneously improving the wettability of the bearing lubricant and the friction surface and improving the wear resistance between the sliding surfaces by plating wear-resistant coating on the bearing surface and heating, chemical treatment and sand blasting of the bearing surface after plating. However, the heating, chemical treatment and sand blasting process of the bearing surface after plating is complex, and during the process, special protection is required for the wear-resistant coating already existing on the surface, which greatly increases the difficulty of the bearing manufacturing process. In addition, the heating, chemical treatment and sand blasting process will also cause the existing wear-resistant coating on the bearing surface to crack or fall off prematurely. Finally, the bearing surface not only cannot obtain good wetting properties, but also the wear-resistant coating on the bearing surface may be damaged, affecting the wear resistance.

[0008] In summary, the wettability of the friction surface with the lubricant and the wear resistance of the friction surfaces are crucial to the performance and service life of sliding bearings used in rotating anode X-ray tubes. Existing technologies treat the bearing surface as a single entity and apply a single coating to it. This results in a bearing surface that only improves wettability or wear resistance, but not both. Ultimately, this has limited impact on overall bearing performance.

[0009] With respect to the technical problem in the prior art that sliding bearings cannot simultaneously take into account both wettability and wear resistance, resulting in poor performance of the sliding bearings, no effective solution has been proposed so far. Summary of the Invention

[0010] The embodiments of the present application provide a liquid metal dynamic pressure sliding bearing, a groove coating manufacturing method and an X-ray tube, so as to at least solve the technical problem in the prior art that the sliding bearing cannot simultaneously take into account the wettability and wear resistance, resulting in poor performance of the sliding bearing.

[0011] According to one aspect of an embodiment of the present application, a sliding bearing is provided, comprising: a bearing core, a rotating shell arranged on the outside of the bearing core, and a liquid metal material arranged between the bearing core and the rotating shell, wherein the rotating shell is capable of rotating around the bearing core, and at least a portion of the surface of the rotating shell opposite to the bearing core and / or at least a portion of the surface of the bearing core opposite to the rotating shell is provided with a plurality of grooves, and wherein the edge surfaces of the grooves are provided with a wear-resistant coating composed of a wear-resistant material, and the bottom surface and / or side surface of the grooves are provided with a first wetting coating composed of a wettable material.

[0012] According to another aspect of an embodiment of the present application, there is provided an X-ray tube, comprising: an anode target disk; and a sliding bearing disposed on the rear side of the anode target disk and connected to the anode target disk, wherein the sliding bearing comprises: a bearing core, a rotating shell disposed outside the bearing core, and a liquid metal material disposed between the bearing core and the rotating shell, wherein the rotating shell is capable of rotating around the bearing core, and is characterized in that at least a portion of a surface of the rotating shell opposite to the bearing core and / or at least a portion of a surface of the bearing core opposite to the rotating shell is provided with a plurality of grooves, wherein the edge surfaces of the grooves are provided with a wear-resistant coating composed of a wear-resistant material, and the bottom surface and / or the side surface of the grooves are provided with a first wetting coating composed of a wettable material.

[0013] In an embodiment of the present application, a sliding bearing comprises a rotating shell, a bearing core, and a liquid metal material. The rotating shell is sleeved onto the bearing core, with the inner surface of the rotating outer shell facing the outer surface of the bearing core. The outer surface of the bearing core has grooves, with a wear-resistant coating applied to the edges of the grooves, and a wetting coating applied to the bottom and / or side surfaces of the grooves, thereby simultaneously improving the wettability and wear resistance of the sliding bearing. Prior art methods treat the bearing surface as a single unit and apply a single coating to it. This results in only improving wettability or wear resistance, not both, and ultimately has limited effect on improving the overall performance of the bearing. Compared to prior art methods, the sliding bearing of this technical solution utilizes grooves on the outer surface of the bearing core, with both a wetting coating and a wear-resistant coating applied to different locations of the grooves. This method simultaneously improves the wettability and wear resistance of the sliding bearing. Furthermore, it achieves technical benefits such as improved bearing performance, extended bearing failure time, and increased service life. This solves the technical problem in the prior art that sliding bearings cannot simultaneously take into account both wettability and wear resistance, resulting in poor performance of the sliding bearings. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0015] Figure 1 is an overall schematic diagram of the sliding bearing according to Example 1 of the present application;

[0016] Figure 2 yes Figure 1 Schematic representation of the bearing core of the sliding bearing shown;

[0017] Figure 3 yes Figure 1 Schematic representation of the rotating outer sleeve of the sliding bearing shown;

[0018] Figure 4a yes Figure 1 Schematic representation of the rotating flange of the plain bearing shown;

[0019] Figure 4b yes Figure 4a a schematic partial enlarged view of the rotating flange shown;

[0020] Figure 5a yes Figure 3 A schematic partial enlarged view of a groove of a bearing core is shown;

[0021] Figure 5b is a schematic diagram of a sliding bearing with straight grooves according to Example 1 of the present application;

[0022] Figure 5c is a schematic diagram of a sliding bearing with oblique grooves according to Example 1 of the present application;

[0023] Figure 6 is an overall schematic diagram of another sliding bearing according to Example 1 of the present application;

[0024] Figure 7a is a schematic diagram of the state of the liquid metal material before aluminum plating on the bearing surface according to Example 1 of the present application;

[0025] Figure 7b is a schematic diagram of the state of the liquid metal material before silver plating on the bearing surface according to Example 1 of the present application;

[0026] Figure 7c is a schematic diagram of the state of the liquid metal material before gold plating on the bearing surface according to Example 1 of the present application;

[0027] Figure 8a is a schematic diagram of the state of the liquid metal material after the bearing surface is aluminum-plated according to Example 1 of the present application;

[0028] Figure 8b is a schematic diagram of the state of the liquid metal material after the bearing surface is silver-plated according to Example 1 of the present application;

[0029] Figure 8c is a schematic diagram of the state of the liquid metal material after the bearing surface is gold-plated according to Example 1 of the present application;

[0030] Figure 9a is a schematic diagram of a bearing mask component according to embodiment 1 of the present application; and

[0031] Figure 9b This is another schematic diagram of the bearing mask part described in Example 1 of the present application. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the technical solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of this application.

[0033] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in a sequence other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0034] Example 1

[0035] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0036] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention 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, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0037] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0038] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0039] Figure 1 The schematic diagram of the sliding bearing described in the embodiment of the present application is shown as an example. Figure 1 As shown, a sliding bearing is provided, comprising: a bearing core 100, a rotating shell 200 arranged outside the bearing core 100, and a liquid metal material arranged between the bearing core 100 and the rotating shell 200, wherein the rotating shell 200 is capable of rotating around the bearing core 100, and at least a portion of the surface of the rotating shell 200 opposite to the bearing core 100 and / or at least a portion of the surface of the bearing core 100 opposite to the rotating shell 200 is provided with a plurality of grooves 300, and wherein the edge surface 310 of the groove 300 is provided with a wear-resistant coating composed of a wear-resistant material, and the bottom surface 320 and / or the side surface 330 of the groove 300 is provided with a first wetting coating composed of a wettable material.

[0040] Specifically, refer to Figure 1 As shown, a sliding bearing for a rotating anode X-ray tube includes a bearing core 100 and a rotating shell 200. Grooves 300 are provided on at least a portion of the outer surface of the bearing core 100, and grooves 300 are also provided on at least a portion of the inner surface of the rotating shell 200. The number of grooves 300 is not limited. The grooves 300 include an edge surface 310, a bottom surface 320, and a side surface 330. The edge surface 310 is provided with a wear-resistant coating made of a wear-resistant material, and the bottom surface 320 and / or the side surface 330 are provided with a wetting coating (i.e., a first wetting coating) made of a wetting material. The rotating shell 200 is then placed over the outer surface of the bearing core 100, and liquid metal material is placed between the rotating shell 200 and the bearing core 100. The sliding bearing is thus assembled. At this point, the inner surface of the rotating shell 200 faces the outer surface of the bearing core 100, allowing the rotating shell 200 to rotate around the bearing core 100. The rotating housing 200 is a rotating component, and the bearing core 100 is a stationary component that supports the rotating component. The rotating housing 200 and the bearing core 100 are made of metal materials that are resistant to corrosion by gallium or gallium alloy lubricants, such as tantalum, tungsten, and molybdenum. The wear-resistant coating applied to the edge surfaces 310 of the groove 300 may be, for example, molybdenum disulfide, tungsten disulfide, or diamond-like carbon. The wetting coating applied to the bottom surface 320 and side surfaces 330 of the groove 300 may be, for example, gold, silver, carbide, boride, or nitride.

[0041] As described in the background, the wettability of the friction surface of sliding bearings used in rotating anode X-ray tubes with the lubricant and the wear resistance of the friction surfaces are crucial to the bearing's performance and service life. Existing technologies treat the bearing surface as a single unit and apply a single coating to it. This results in a bearing surface that only improves wettability or wear resistance, but not both. Ultimately, this has limited impact on overall bearing performance.

[0042] To address the above-mentioned technical issues, the present invention provides a technical solution in an embodiment of a sliding bearing comprising a rotating shell, a bearing core, and a liquid metal material. The rotating shell is sleeved onto the bearing core, with the inner surface of the rotating outer shell facing the outer surface of the bearing core. The outer surface of the bearing core has grooves, with a wear-resistant coating applied to the edges of the grooves, and a wetting coating applied to the bottom and / or side surfaces of the grooves, thereby simultaneously improving the wettability and wear resistance of the sliding bearing. Prior art methods treat the bearing surface as a single entity and apply a single coating to it. This results in only improving wettability or wear resistance, not both, ultimately resulting in limited improvement in overall bearing performance. Compared to prior art methods, the sliding bearing in this technical solution utilizes grooves on the outer surface of the bearing core, with both a wetting coating and a wear-resistant coating applied to different locations of the grooves. This approach simultaneously improves the wettability and wear resistance of the sliding bearing. Furthermore, it achieves technical benefits such as improved bearing performance, extended bearing failure time, and increased service life. This solves the technical problem in the prior art that sliding bearings cannot simultaneously take into account both wettability and wear resistance, resulting in poor performance of the sliding bearings.

[0043] Optionally, a second wetting coating composed of a wetting material is provided on the surface of the bearing core 100 and / or the rotating housing 200 opposite to the groove 300 .

[0044] Specifically, the smooth surface of the bearing core 100 not provided with the grooves 300 is provided with a wetting coating (i.e., a second wetting coating). The rotating housing 200 is then sleeved over the bearing core 100, so that the smooth surface of the bearing core 100 provided with the wetting coating (i.e., the second wetting coating) faces the grooves 300 provided on the inner surface of the rotating housing 200.

[0045] Alternatively, a wetting coating (i.e., a second wetting coating) is provided on the smooth surface of the rotating shell 200 that is not provided with the grooves 300. The rotating shell 200 is then sleeved onto the bearing core 100, with the smooth surface of the rotating shell 200 provided with the wetting coating (i.e., the second wetting coating) facing the grooves 300 provided on the outer surface of the bearing core 100.

[0046] Alternatively, the smooth surface of the bearing core 100, which is not provided with the groove 300, is provided with a wetting coating (i.e., a second wetting coating). The smooth surface of the rotating shell 200, which is not provided with the groove 300, is provided with a wetting coating (i.e., a second wetting coating). After the rotating shell 200 is sleeved on the bearing core 100, the smooth surface of the bearing core 100, which is provided with the wetting coating (i.e., a second wetting coating), is opposite to the groove 300 provided on the inner surface of the rotating shell 200, and the smooth surface of the bearing core 100, which is provided with the wetting coating (i.e., a second wetting coating), is opposite to the groove 300 provided on the inner surface of the rotating shell 200.

[0047] Therefore, the technical scheme can improve the wetting and wear resistance of the sliding bearing by providing the smooth surface opposite to the groove provided with the wear-resistant coating with a wetting coating.

[0048] Alternatively, the rotating shell 200 comprises a rotating sleeve 210 and a rotating flange 220. The rotating sleeve 210 is sleeved on the outer side of the bearing core 100 from the front end of the bearing core 100 and can rotate around the bearing core 100. The rotating flange 220 is sleeved on the outer side of the bearing core 100 and connected with the rear end of the rotating sleeve 210, and can rotate around the bearing core 100. At least a part of the surface of the rotating sleeve 210 opposite to the bearing core 100, at least a part of the surface of the bearing core 100 opposite to the rotating sleeve 210, at least a part of the surface of the rotating flange 220 opposite to the bearing core 100, and / or at least a part of the surface of the bearing core 100 opposite to the rotating flange 220 is provided with the groove 300.

[0049] Specifically, the rotating shell 200 comprises a rotating sleeve 210 and a rotating flange 220. Therefore, the rotating sleeve 210 can be sleeved on the outer side of the bearing core 100 from the front end of the bearing core 100, and the rotating flange 220 can also be sleeved on the outer side of the bearing core 100 from the rear end of the bearing core 100. After that, the rotating flange 220 is connected with the rear end of the rotating sleeve 210. After the sleeve is completed, at least a part of the surface of the rotating sleeve 210 opposite to the bearing core 100 is provided with the groove 300 before the sleeve. At least a part of the surface of the bearing core 100 opposite to the rotating sleeve 210 is provided with the groove 300 before the sleeve. At least a part of the surface of the rotating flange 220 opposite to the bearing core 100 is provided with the groove 300 before the sleeve. At least a part of the surface of the bearing core 100 opposite to the rotating flange 220 is provided with the groove 300 before the sleeve.

[0050] Furthermore, the rotating outer sleeve 210 and the rotating flange 220 rotate around the bearing core 100 .

[0051] Therefore, the present technical solution can ensure the wettability and wear resistance of each component of the sliding bearing by providing grooves on at least a portion of the surface of the rotating outer sleeve 210, the rotating flange 220 and the bearing core 100.

[0052] Optionally, a second wetting coating made of a wetting material is provided on the surfaces of the bearing core 100 , the rotating outer sleeve 210 and / or the rotating flange 220 opposite to the groove 300 .

[0053] Specifically, a portion of the outer surface of the bearing core 100 is configured as a smooth surface, and a second wetting coating composed of a wettable material is provided on the smooth surface. Grooves 300 are provided on the surfaces of the rotating outer sleeve 210 and the rotating flange 220 that face the bearing core 100. After the rotating outer sleeve 210 and the rotating flange 220 are fitted over the outer surface of the bearing core 100, the surface of the bearing core 100 provided with the wetting coating (i.e., the second wetting coating) faces the groove 300 provided on the inner surface of the rotating outer sleeve 210. Furthermore, the surface of the bearing core 100 provided with the wetting coating (i.e., the second wetting coating) faces the groove 300 provided on the inner surface of the rotating flange 220.

[0054] Therefore, the present technical solution can simultaneously improve the wettability and wear resistance of the sliding bearing by providing the smooth surface opposite to the groove provided with the wear-resistant coating with the wettability coating.

[0055] Optionally, the bearing core 100 includes a bearing core body 110 , wherein at least a portion of the groove 300 is disposed on a side surface 111 of the bearing core body 110 opposite to the rotating sleeve 210 , or on an inner surface 211 opposite to the rotating sleeve 210 and the bearing core body 110 .

[0056] Specifically, refer to Figure 2 as well as Figure 3 As shown, the bearing core 100 includes a bearing core body 110 , a side surface 111 of the bearing core body 110 is provided with a groove 300 , and an inner surface 211 of the rotating outer sleeve 210 opposite to the groove 300 provided on the side surface 111 is a smooth surface.

[0057] Alternatively, the side surface 111 of the bearing core 110 is configured as a smooth surface, and the inner surface 211 of the rotating outer sleeve 210 opposite to the side surface 111 is provided with a groove 300 (not shown in the figure).

[0058] Therefore, the present technical solution can simultaneously improve the wettability and wear resistance of the sliding bearing by providing the smooth surface opposite to the groove provided with the wear-resistant coating with the wettability coating.

[0059] Optionally, the bearing core 100 further comprises a boss 120 arranged on the side surface 111 of the bearing core body 110, wherein the rotating sleeve 210 is arranged on the front side of the boss 120, and the rotating flange 220 is arranged on the rear side of the boss 120.

[0060] Specifically, referring to Figure 2 the bearing core 100 comprises the boss 120 in addition to the bearing core body 110. The boss 120 is arranged on the side surface 111 of the bearing core body 110. Thus, the rotating sleeve 210 is mounted on the front side of the boss 120, the rotating flange 220 is mounted on the rear side of the boss 120, and the rotating sleeve 210 and the rotating flange 220 are connected. Thus, the present technical solution makes it easier to disassemble and install by mounting the rotating sleeve 210 and the rotating flange 220 respectively.

[0061] Optionally, at least a part of the groove 300 is arranged on the surface opposite to the boss 120 of the rotating sleeve 210, or on the surface opposite to the rotating sleeve 210 of the boss 120.

[0062] Specifically, the surface opposite to the boss 120 of the rotating sleeve 210 is provided with the groove 300, and the surface opposite to the rotating sleeve 210 of the boss 120 is a smooth surface.

[0063] Alternatively, the surface opposite to the boss 120 of the rotating sleeve 210 is a smooth surface, and the surface opposite to the rotating sleeve 210 of the boss 120 is provided with the groove 300 (not shown in the figure).

[0064] Thus, the present technical solution can improve the lubricity and wear resistance of the sliding bearing by arranging the smooth surface opposite to the groove provided with the wear-resistant coating with the wetting coating.

[0065] Optionally, at least a part of the groove 300 is arranged on the surface opposite to the boss 120 of the rotating flange 220, or on the surface opposite to the rotating sleeve 210 of the rotating flange 220.

[0066] Specifically, referring to Figure 4a and Figure 4b the surface opposite to the boss 120 of the rotating flange 220 is provided with the groove 300, and the surface opposite to the rotating flange 220 of the boss 120 is a smooth surface. The smooth surface of the boss 120 is plated with a wetting coating, for example, gold, silver, carbide, boride, or nitride, etc.

[0067] Alternatively, a portion of the surface of the rotating flange 220 is opposite to a portion of the surface of the boss 120, the surface of the rotating flange 220 opposite to the boss 120 is set to a smooth surface, and the surface of the boss 120 opposite to the rotating flange 220 has a groove 300 (not shown in the figure).

[0068] Therefore, the present technical solution can simultaneously improve the wettability and wear resistance of the sliding bearing by providing the smooth surface opposite to the groove provided with the wear-resistant coating with the wettability coating.

[0069] Optionally, refer to Figure 5a As shown, the groove 300 is a herringbone groove 300. Thus, the present technical solution obtains multiple different surfaces through the herringbone groove, including an edge surface 310, a bottom surface 320 and a side surface 330. And refer to Figure 5b as well as Figure 5c As shown, the groove structure of this technical solution can include straight grooves, oblique grooves, and figure-eight grooves in addition to the herringbone structure. Therefore, this technical solution can improve the performance of the sliding bearing in many aspects by plating different coatings on various surfaces of the groove.

[0070] Optionally, the thickness of the wear-resistant coating provided on the edge surface 310 of the groove 300 is no greater than 5% of the depth of the groove 300. For example, it can be 500 nm to 2000 nm. Thus, the wear resistance of the sliding bearing can be improved by a reasonable film thickness.

[0071] Optionally, the thickness of the first wetting coating provided on the bottom surface 320 and the side surface 330 of the groove 300 is no greater than 5% of the depth of the groove 300. For example, it may be 500 μm to 2000 μm. Thus, a reasonable film thickness can improve the wettability of the sliding bearing.

[0072] Optionally, the thickness of the second wetting coating is no greater than 5% of the depth of the groove 300. For example, it can be 500 μm to 2000 μm. Thus, the wettability of the sliding bearing can be improved by a reasonable film thickness.

[0073] Optionally, the roughness of the wear-resistant coating provided on the edge surface 310 of the groove 300 is not greater than Ra 0.4. Thus, by setting a reasonable roughness of the wear-resistant coating, the edge surface that is easily worn can be made more wear-resistant and the service life can be extended.

[0074] In addition, this technical solution can also be applied to Figure 6 The bearing shown has thrust bearings 500 and 600 placed at both ends of a bearing core 400. The first thrust bearing 500 and the second thrust bearing 600 are disposed at both ends of the bearing core 400. The bearing core 400 is a radial bearing. The grooves on the bearing core 400 are in an "eight" shape.

[0075] also, Figures 7a to 7c as well as Figures 8a to 8c , showing the changes in wettability between the liquid metal material and the sliding bearing surface before and after plating with different metal coatings. Figure 7a It is the state of liquid metal material before aluminum plating on the bearing surface. Figure 8a It is the state of liquid metal material after the bearing surface is aluminum-plated. Figure 7b This is the state of the liquid metal material before the bearing surface is silver-plated. Figure 8b It is the state of liquid metal material after the bearing surface is silver-plated. Figure 7c This is the state of the liquid metal material before the bearing surface is plated with gold. Figure 8c This is the state of the liquid metal material after the bearing surface is gold-plated.

[0076] Before coating, the contact angle between the sliding bearing surface and the liquid metal material was greater than 90 degrees. After coating with different metal coatings, the contact angle between the bearing surface and the liquid metal material was much less than 90 degrees, and the wetting effect was significantly improved.

[0077] In addition, reference Figure 9a as well as Figure 9b As shown, the process of plating the wear-resistant coating and the wet coating for the groove 300 (the method for manufacturing the groove coating) is as follows:

[0078] (1) ultrasonically cleaning and drying the bearing mask part 800;

[0079] (2) The bearing mask part 800 is sleeved on the groove 300 of the bearing core 100, wherein the bearing mask part 800 is a hollow structure;

[0080] (3) masking the ridge surface 310 of the groove 300 by the bearing mask part 800 and exposing the bottom surface 320 and the side surface 330 , and then plating a wetting coating on the bottom surface 320 and the side surface 330 of the groove 300 using a physical vapor deposition (PVD) method;

[0081] (4) rotating the bearing mask part 800 on the bearing core 100 by one rib position, masking the bottom surface 320 and the side surface 330 of the groove 300 by using the ribs in the bearing mask part 800, and exposing the rib surface 310 of the groove 300, and then plating a wear-resistant coating on the rib surface 310 using a physical vapor deposition (PVD) method;

[0082] (5) The bearing mask part 800 is separated from the bearing core 100, thereby obtaining the edge surface 310 plated with the wear-resistant coating and the bottom surface 320 and the side surface 330 plated with the wetting coating.

[0083] According to a first aspect of the present embodiment, the sliding bearing comprises a rotating shell, a bearing core and a liquid metal material, the rotating shell is sleeved on the bearing core, that is, the inner surface of the rotating shell is opposite to the outer surface of the bearing core. The outer surface of the bearing core has a groove, and a wear-resistant coating is plated on the edge surface of the groove, and a wetting coating is plated on the bottom surface and / or the side surface of the groove, so as to improve the wetting and wear resistance of the sliding bearing at the same time. The prior art regards the bearing surface as a whole and plates a single coating on the surface. The bearing surface obtained in this way can only improve the wetting or wear resistance, and cannot improve the weting and wear resistance at the same time, so the improvement effect on the overall performance of the bearing is limited. Compared with the prior art, the sliding bearing in the technical solution can improve the wetting and wear resistance of the sliding bearing at the same time by arranging the groove on the outer surface of the bearing core and plating the wetting coating and the wear-resistant coating on different positions of the groove. The technical effects of improving the performance of the sliding bearing, prolonging the failure time of the sliding bearing and improving the service life are achieved. The technical problem of poor performance of the sliding bearing caused by the fact that the prior art cannot simultaneously consider the wetting and wear resistance of the sliding bearing is solved.

[0084] In addition, according to a second aspect of the present embodiment, an X-ray tube is provided, comprising: an anode target disc; and a sliding bearing arranged at the back side of the anode target disc and connected with the anode target disc, wherein the sliding bearing comprises: a bearing core 100, a rotating shell 200 arranged outside the bearing core 100, and a liquid metal material arranged between the bearing core 100 and the rotating shell 200, wherein the rotating shell 200 can rotate around the bearing core 100, characterized in that at least a part of the surface of the rotating shell 200 opposite to the bearing core 100 and / or at least a part of the surface of the bearing core 100 opposite to the rotating shell 200 is provided with a plurality of grooves 300, and wherein the edge surface 310 of the groove 300 is provided with a wear-resistant coating composed of a wear-resistant material, and the bottom surface 320 and / or the side surface 330 of the groove 300 is provided with a first wetting coating composed of a wetting material.

[0085] Optionally, the surface of the bearing core 100 and / or the rotating shell 200 opposite to the groove 300 is provided with a second wetting coating composed of a wetting material.

[0086] Optionally, the rotating shell 200 includes a rotating sleeve 210 and a rotating flange 220, wherein the rotating sleeve 210 is sleeved on the outside of the bearing core 100 from the front end of the bearing core 100, and the rotating sleeve 210 can rotate around the bearing core 100; and the rotating flange 220 is sleeved on the outside of the bearing core 100 and connected to the rear end of the rotating sleeve 210, and the rotating flange 220 can rotate around the bearing core 100, and wherein at least a portion of the surface of the rotating sleeve 210 opposite to the bearing core 100, at least a portion of the surface of the bearing core 100 opposite to the rotating sleeve 210, at least a portion of the surface of the rotating flange 220 opposite to the bearing core 100 and / or at least a portion of the surface of the bearing core 100 opposite to the rotating flange 220 are provided with a groove 300.

[0087] Optionally, a second wetting coating made of a wetting material is provided on the surfaces of the bearing core 100 , the rotating outer sleeve 210 and / or the rotating flange 220 opposite to the groove 300 .

[0088] Optionally, the bearing core 100 includes a bearing core body 110 , wherein at least a portion of the groove 300 is disposed on a side surface 111 of the bearing core body 110 opposite to the rotating sleeve 210 , or on an inner surface 211 opposite to the rotating sleeve 210 and the bearing core body 110 .

[0089] Optionally, the bearing core 100 further includes a boss 120 disposed on the side surface 111 of the bearing core body 110 , wherein the rotating sleeve 210 is disposed on the front side of the boss 120 , and the rotating flange 220 is disposed on the rear side of the boss 120 .

[0090] Optionally, at least a portion of the groove 300 is disposed on a surface of the rotating sleeve 210 opposite to the boss 120 , or on a surface of the boss 120 opposite to the rotating sleeve 210 .

[0091] Optionally, at least a portion of the groove 300 is disposed on a surface of the rotating flange 220 opposite to the boss 120 , or on a surface of the rotating flange 220 opposite to the rotating housing 210 .

[0092] Optionally, the groove 300 is a herringbone groove 300 .

[0093] Optionally, the thickness of the wear-resistant coating disposed on the edge surface 310 of the groove 300 is no more than 5% of the depth of the groove 300 .

[0094] Optionally, the thickness of the first wetting coating layer disposed on the bottom surface 320 and the side surface 330 of the groove 300 is no greater than 5% of the depth of the groove 300 .

[0095] Optionally, the film thickness of the second wetting coating layer is no greater than 5% of the depth of the groove 300 .

[0096] Optionally, the roughness of the wear-resistant coating provided on the edge surface 310 of the groove 300 is not greater than Ra0.4.

[0097] Therefore, according to the embodiment, the sliding bearing comprises a rotating shell, a bearing core and a liquid metal material, the rotating shell is sleeved on the bearing core, that is, the inner surface of the rotating shell is opposite to the outer surface of the bearing core. The outer surface of the bearing core has a groove, and a wear-resistant coating is plated on the edge surface of the groove, and a wetting coating is plated on the bottom surface and / or the side surface of the groove, thereby improving the wetting and wear resistance of the sliding bearing at the same time. The prior art regards the bearing surface as a whole and plates a single coating on the surface. The bearing surface obtained in this way can only improve the wetting or wear resistance, and cannot improve the wetting and wear resistance at the same time, so the improvement effect on the overall performance of the bearing is limited. Compared with the prior art, the sliding bearing in the technical solution can improve the wetting and wear resistance of the sliding bearing at the same time by providing a groove on the outer surface of the bearing core and plating a wetting coating and a wear-resistant coating on different positions of the groove. The technical effects of improving the performance of the sliding bearing, prolonging the failure time of the sliding bearing and improving the service life are achieved. The technical problem of poor performance of the sliding bearing caused by the fact that the prior art cannot simultaneously consider the wetting and wear resistance of the sliding bearing is solved.

[0098] It should be noted that, for the above-mentioned method embodiments, in order to simply describe, they are all expressed as a series of action combinations, but those skilled in the art should know that the present application is not limited by the action sequence described, because according to the present application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should know that the embodiments described in the specification all belong to preferred embodiments, and the actions and modules involved are not necessarily necessary for the present application.

[0099] Those skilled in the art can clearly understand the method according to the above-mentioned embodiments can be realized by means of software and necessary general hardware platform, of course, it can also be realized by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes a plurality of instructions for making a terminal device (which can be a mobile phone, computer, server or network device) execute the method described in each embodiment of the present application.

[0100] The above-mentioned embodiment numbers of the present application are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0101] In the above embodiments of the present invention, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0102] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods, such as 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 mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0103] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0104] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0105] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk, etc. Various media that can store program codes.

[0106] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A sliding bearing comprising: A bearing core (100), a rotating shell (200) arranged outside the bearing core (100), and a liquid metal material arranged between the bearing core (100) and the rotating shell (200), wherein the rotating shell (200) is capable of rotating around the bearing core (100), and is characterized in that: At least a portion of the surface of the rotating shell (200) opposite to the bearing core (100) and / or at least a portion of the surface of the bearing core (100) opposite to the rotating shell (200) is provided with a plurality of grooves (300), and wherein The edge surface (310) of the groove (300) is provided with a wear-resistant coating composed of a wear-resistant material, and the bottom surface (320) and / or the side surface (330) of the groove (300) are provided with a first wetting coating composed of a wettable material, and wherein, The surfaces of the bearing core (100) and / or the rotating shell (200) opposite to the groove (300) are provided with a second wetting coating composed of a wetting material.

2. The sliding bearing according to claim 1, characterized in that The rotating shell (200) includes a rotating outer shell (210) and a rotating flange (220), wherein The rotating outer sleeve (210) is sleeved on the outer side of the bearing core (100) from the front end of the bearing core (100), and the rotating outer sleeve (210) is capable of rotating around the bearing core (100); and The rotating flange (220) is sleeved on the outer side of the bearing core (100) and connected to the rear end of the rotating outer sleeve (210), and the rotating flange (220) can rotate around the bearing core (100), and wherein The groove (300) is provided on at least a portion of the surface of the rotating outer sleeve (210) opposite to the bearing core (100), at least a portion of the surface of the bearing core (100) opposite to the rotating outer sleeve (210), at least a portion of the surface of the rotating flange (220) opposite to the bearing core (100), and / or at least a portion of the surface of the bearing core (100) opposite to the rotating flange (220).

3. The sliding bearing according to claim 2, characterized in that The second wetting coating made of a wettable material is provided on the surface of the bearing core (100), the rotating outer sleeve (210) or the rotating flange (220) opposite to the groove (300).

4. The sliding bearing according to claim 2, characterized in that The bearing core (100) includes a bearing core body (110), wherein at least a portion of the groove (300) is arranged on a side surface (111) of the bearing core body (110) opposite to the rotating outer sleeve (210), or is arranged on an inner surface (211) of the rotating outer sleeve (210) opposite to the bearing core body (110).

5. The sliding bearing according to claim 4, characterized in that The bearing core (100) further comprises a boss (120) provided on the side surface (111) of the bearing core body (110), wherein the rotating outer sleeve (210) is provided on the front side of the boss (120), and the rotating flange (220) is provided on the rear side of the boss (120), wherein At least a portion of the groove (300) is provided on a surface of the rotating outer sleeve (210) opposite to the boss (120), or is provided on a surface of the boss (120) opposite to the rotating outer sleeve (210).

6. The sliding bearing according to claim 5, characterized in that At least a portion of the groove (300) is provided on a surface of the rotating flange (220) opposite to the boss (120), or on a surface of the rotating flange (220) opposite to the rotating outer sleeve (210).

7. The sliding bearing according to claim 1, characterized in that The groove (300) is a herringbone groove (300), and The thickness of the wear-resistant coating provided on the edge surface (310) of the groove (300) is not greater than 5% of the depth of the groove (300), and The thickness of the first wetting coating provided on the bottom surface (320) and the side surface (330) of the groove (300) is no greater than 5% of the depth of the groove (300), and The roughness of the wear-resistant coating provided on the edge surface (310) of the groove (300) is not greater than Ra0.

4.

8. The sliding bearing according to claim 1, characterized in that The film thickness of the second wetting coating is no greater than 5% of the depth of the groove (300).

9. An X-ray tube comprising: Anode target; and a sliding bearing according to any one of claims 1 to 8, which is arranged on the rear side of the anode target disk and connected to the anode target disk.

Images