Sealing device and bearing

Abstract

The embodiment of the invention discloses a sealing device and a bearing. The sealing device comprises a first conductive insert, an elastic conductive part and a conductive lubricant. The first conductive insert is used for being connected and electrically conducted with the first rotating assembly. The elastic conductive piece is connected with the first conductive insert and electrically conducted, the elastic conductive piece is provided with a binding face used for being attached to the second rotating assembly in a sealed mode, and at least one groove is formed in the binding face of the elastic conductive piece. The conductive lubricants are made of conductive materials and are filled in the grooves and / or attached to the binding faces. The sealing device not only can seal the gap between the first rotating assembly and the second rotating assembly, but also can electrically conduct the first rotating assembly and the second rotating assembly so as to reduce the potential difference between the first rotating assembly and the second rotating assembly. Besides, the conductive lubricants are arranged between the elastic conductive parts and the second rotating assembly, so that the frictional resistance is reduced on the premise of ensuring electric conduction, and the abrasion of the elastic conductive parts is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sealing, in particular to a sealing device and a bearing. BACKGROUND

[0002] The sealing device is used for sealing a gap between a first rotating component and a second rotating component capable of relative rotation. In some cases, a potential difference is generated between the first rotating component and the second rotating component, which will have an adverse effect on the first rotating component and the second rotating component. For example, a bearing includes an inner ring, an outer ring, and a roller sandwiched between the inner ring and the outer ring. During relative rotation of the inner ring and the outer ring, an oil film is formed between the roller and the inner ring and the outer ring, respectively. The oil film has an insulating property. In some cases, a potential difference is generated between the inner ring and the outer ring. For example, when the bearing is a rolling bearing on a train axle box, residual voltage will affect the bearing due to the incomplete filtering of waveforms by the electric filter when the motor is working. Since the oil film is not conductive, the potential difference between the inner ring and the outer ring gradually accumulates, and when it accumulates to a certain extent, spark discharge occurs to break through the oil film, resulting in pitting on the contact surface of the roller and the inner ring and the outer ring.

[0003] At present, a metal coil is embedded in the bearing, and the metal coil is in contact with the inner ring and the outer ring to electrically conduct the inner ring and the outer ring. However, the metal coil will have serious wear with the inner ring and the outer ring, resulting in heating of the bearing and rapid decrease of the electrical conductivity. SUMMARY

[0004] Embodiments of the present application provide a sealing device and a bearing, which reduce the potential difference between a first rotating component and a second rotating component capable of relative rotation.

[0005] To solve the above technical problems, embodiments of the present application disclose the following technical solutions:

[0006] In one aspect, a sealing device is provided for sealing a gap between a first rotating component and a second rotating component capable of relative rotation. The sealing device is annularly arranged around an outer periphery of a reference axis. The sealing device includes a first conductive sealing member. The first conductive sealing member includes a first conductive insert, an elastic conductive member, and a conductive lubricating substance. The first conductive insert is made of a conductive material and is configured to be connected to and electrically conduct the first rotating component. The elastic conductive member is made of a conductive material and is connected to and electrically conducts the first conductive insert. The elastic conductive member has an abutting surface configured to abut and seal against the second rotating component. The elastic conductive member has at least one groove formed on the abutting surface. The conductive lubricating substance is made of a conductive material and is filled in the groove and / or attached to the abutting surface.

[0007] In addition to one or more features disclosed above, or as an alternative, the groove is annularly arranged around the outer periphery of the reference axis.

[0008] In addition to one or more of the above disclosed features, or alternatively, the elastic conductive member includes a body portion connected to and electrically conductive with the first conductive insert, and a lip portion connected to the body portion, the lip portion having a concave groove and a contact surface, the lip portion extending away from the body portion in a natural state, the concave groove being a plurality of concave grooves spaced along the extension direction of the lip portion in the natural state of the lip portion.

[0009] In addition to one or more of the above disclosed features, or alternatively, the body portion is connected to a radially inner end of the first conductive insert, and the lip portion is located radially inward of the body portion, the extension direction of the lip portion being obliquely arranged relative to the reference axis in the natural state, and the inner circumferential surface of the lip portion forms the contact surface.

[0010] In addition to one or more of the above disclosed features, or alternatively, the material of the elastic conductive member includes conductive rubber, and the material of the conductive lubricant includes graphite.

[0011] In addition to one or more of the above disclosed features, or alternatively, the sealing device further includes a second conductive sealing member and a flexible conductive member, the second conductive sealing member being configured to be connected to and electrically conductive with the first rotating component, and the flexible conductive member being made of conductive material and arranged between the first conductive sealing member and the second conductive sealing member, the electrical conductivity of the flexible conductive member being greater than that of the elastic conductive member of the first conductive sealing member.

[0012] In addition to one or more of the above disclosed features, or alternatively, the flexible conductive member includes a first sub-portion at a radially outer side and a second sub-portion at a radially inner side, the first sub-portion and the second sub-portion being arranged at a preset angle and connected to each other.

[0013] In addition to one or more of the above disclosed features, or alternatively, the first sub-portion is arranged outside the reference axis, and the second sub-portion includes a plurality of notches spaced along a circumferential direction, the notches being arranged at an edge of the second sub-portion away from the first sub-portion.

[0014] In addition to one or more of the above disclosed features, or alternatively, the elastic conductive member has a radially outer end provided with a protrusion, the first sub-portion being in electrically conductive contact with the elastic conductive member through the protrusion, and the second sub-portion being in electrically conductive contact with a radially inner end of the elastic conductive member.

[0015] In another aspect, a bearing is also provided, the bearing including a first rotating component, a second rotating component, and a sealing device. The first rotating component and the second rotating component are capable of relative rotation. The sealing device seals a gap between the first rotating component and the second rotating component, and is electrically conductive with the first rotating component and the second rotating component, respectively, the sealing device being any of the above sealing devices.

[0016] One of the above technical solutions has the following advantages or beneficial effects:

[0017] In the technical solution, the first conductive insert is connected with the first rotating component and electrically connected with the first rotating component in the state that the sealing device seals the gap between the first rotating component and the second rotating component, and the elastic conductive member is directly in electric contact with the second rotating component and / or electrically connected with the second rotating component through the conductive lubricant. Thus, the sealing device electrically connects the first rotating component and the second rotating component, and the potential difference between the first rotating component and the second rotating component is reduced. In addition, the conductive lubricant is arranged between the elastic conductive member and the second rotating component, and the frictional resistance is reduced under the premise of ensuring the electrical connection, so that the wear of the elastic conductive member is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] The technical solution and other beneficial effects of the present application will be apparent from the following detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings.

[0019] Figure 1 is a sectional structure schematic view of an embodiment of the bearing of the present application;

[0020] Figure 2 is a sectional structure schematic view of an embodiment of the bearing of the present application; Figure 1 is an enlarged view of the partial view A in the figure;

[0021] Figure 3 is a sectional structure schematic view of an embodiment of the bearing of the present application;

[0022] Figure 4 is a sectional structure schematic view of an embodiment of the bearing of the present application;

[0023] Figure 5 is a sectional structure schematic view of an embodiment of the bearing of the present application;

[0024] Figure 6 is a sectional structure schematic view of an embodiment of the bearing of the present application;

[0025] Figure 7 is a sectional structure schematic view of an embodiment of the bearing of the present application;

[0026] Figure 8 is a sectional structure schematic view of an embodiment of the bearing of the present application; Figure 1 is an enlarged view of the partial view B in the figure;

[0027] Figure 9 is a sectional structure schematic view of an embodiment of the bearing of the present application;

[0028] Explanation of reference signs, 100 - first rotating assembly; 101 - rotating cavity; 200 - second rotating assembly; 210 - inner ring; 220 - oil retaining ring; 221 - outer wall surface; 300 - sealing device; 310 - first conductive insert; 320 - elastic conductive piece; 321 - main body part; 322 - lip part; 323 - groove; 324 - radially outer end; 325 - protrusion; 326 - abutting surface; 327 - radially inner end; 328 - oil pumping groove; 3281 - inclined surface; 329 - labyrinth groove; 330 - elastic piece; 340 - second conductive insert; 350 - flexible sealing piece; 360 - flexible conductive piece; 361 - first sub-part; 362 - second sub-part; 363 - notch; 370 - conductive lubricant; 380 - first conductive sealing piece; 390 - second conductive sealing piece; 500 - roller; L - reference axis. DETAILED DESCRIPTION

[0029] In order to make the purposes, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below with reference to the drawings and specific embodiments. It should be understood that the specific embodiments described in the present specification are only for the purpose of explaining the present application, and are not intended to limit the present application.

[0030] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0031] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] In the present application, unless specifically stated and limited otherwise, a first feature "on" or "under" a second feature can include the first and second features being in direct contact, or can include the first and second features not being in direct contact but being in contact through another feature between them. Also, a first feature "over", "above" and "on top of" a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. A first feature "under", "below" and "underneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0033] In the related art, in order to reduce the potential difference between the outer ring and the inner ring of the bearing, the inner ring and the outer ring are electrically conducted by a metal coil respectively contacting the inner ring and the outer ring. However, the metal coil will have serious wear with the inner ring and the outer ring, resulting in heating of the bearing and rapid decrease of the electrical conductivity.

[0034] The embodiments of the present application provide a sealing device and a bearing comprising the same, which reduce the potential difference between the first rotating component and the second rotating component in another way. The bearing can include but is not limited to a tapered roller bearing.

[0035] Hereinafter, the radial direction of the second rotating component 200 is the radial direction of the bearing, and the axial direction of the second rotating component 200 is the axial direction of the bearing. The electrically conductive contact means that the contact point between two or more electronic elements or conductors has good electrical conductivity. In the figure, the D2 direction is the axial direction inward, that is, the direction toward the inside of the rotating cavity. The D1 direction is the radial direction inward.

[0036] Please refer to Figures 1 to 3 , Figure 1 which is a sectional structure schematic diagram of an embodiment of the bearing of the present application, Figure 2 which is Figure 1 an enlarged view of the partial view A in Figure 3 which is a sectional schematic diagram of the first electrically conductive sealing member 380 in the embodiment of the present application.

[0037] In some embodiments, the bearing comprises a first rotating component 100, a second rotating component 200 and a sealing device 300. The first rotating component 100 encloses a rotating cavity 101. The second rotating component 200 is rotatably arranged in the rotating cavity 101. The sealing device 300 is annularly arranged outside the reference axis L. The sealing device 300 is arranged between the first rotating component 100 and the second rotating component 200 to seal the gap between the first rotating component 100 and the second rotating component 200, and the sealing device 300 electrically conducts the first rotating component 100 and the second rotating component 200.

[0038] Specifically, the roller 500 is clamped between the first rotating assembly 100 and the second rotating assembly 200, so that the first rotating assembly 100 and the second rotating assembly 200 can relatively rotate around the reference axis L. The first rotating assembly 100 is used to connect a first rotating body (not shown in the figure), and the second rotating assembly 200 is used to connect a second rotating body (not shown in the figure), so that the first rotating body and the second rotating body can relatively rotate around the reference axis L, thereby realizing the basic function of a bearing. The first rotating body is, for example, a wheel, and the second rotating body is, for example, a shaft body. The rotating cavity 101 is filled with lubricating grease, and the sealing device 300 covers the rotating cavity 101, so as to avoid leakage of the lubricating grease and invasion of foreign matters into the rotating cavity 101.

[0039] The sealing device 300 is fixedly connected with the first rotating assembly 100 and electrically conductive. The sealing device 300 is sleeved outside the second rotating assembly 200 and elastically abuts against the outer wall surface 221 of the second rotating assembly 200 in the radial direction of the second rotating assembly 200. During the relative rotation of the first rotating assembly 100 and the second rotating assembly 200, the sealing device 300 relatively rotates with the second rotating assembly 200.

[0040] Specifically, the second rotating assembly 200 includes an inner ring 210 and an oil retaining ring 220. The roller 500 is clamped between the first rotating assembly 100 and the inner ring 210, so that the first rotating assembly 100 and the inner ring 210 can relatively rotate around the reference axis L. The inner ring 210 is used to connect the second rotating body. The oil retaining ring 220 is sleeved outside the inner ring 210 and fixedly connected with the inner ring 210. The oil retaining ring 220 is made of metal material. The sealing device 300 is sleeved outside the oil retaining ring 220 and sealingly matched with the oil retaining ring 220. The sealing device 300 and the oil retaining ring 220 can relatively rotate around the reference axis L. The inner ring 210, the oil retaining ring 220, the sealing device 300 and the first rotating assembly 100 are electrically conductive in sequence. The oil retaining ring 220 improves the sealing effect by cooperating with the sealing device 300 through a specific structure. The specific structure of the oil retaining ring 220 can refer to the existing related structure, which will not be described here. The structure of the second rotating assembly 200 is not limited to this, and other structures can also be used. For example, in some embodiments, the second rotating assembly 200 only includes the inner ring 210, and correspondingly, the sealing device 300 is directly sleeved outside the inner ring 210 and sealingly matched with the inner ring 210.

[0041] The sealing device 300 comprises a first conductive seal 380. The first conductive seal 380 comprises a first conductive insert 310, an elastic conductive member 320, and a conductive lubricant 370. The first conductive insert 310 is made of a conductive material and annularly arranged around the reference axis L. The first conductive insert 310 is electrically connected to the first rotating component 100. The elastic conductive member 320 is made of a conductive material and annularly arranged around the reference axis L. The elastic conductive member 320 is connected to and electrically connected to the first conductive insert 310. The elastic conductive member 320 has an abutting surface 326 abuttingly sealed to the second rotating component 200. The elastic conductive member 320 is provided with at least one groove 323 on the abutting surface 326. The conductive lubricant 370 is made of a conductive material and filled in the groove 323 and / or attached to the abutting surface 326.

[0042] Specifically, the first conductive insert 310 is made of a metal material. The first conductive insert 310 is nested with the first rotating component 100 around the reference axis L and electrically connected. The first conductive insert 310 has rigidity and is easier to assemble by nested cooperation with the first rotating component 100. In other embodiments, the first conductive insert 310 is directly nested in the first rotating component 100 without the second conductive insert 340. Figure 1 In the shown bearing, the first conductive insert 310 is indirectly connected to the first rotating component 100 through the second conductive insert 340 below. That is, the second conductive insert 340 is nested in the first rotating component 100, and the first conductive insert 310 is nested in the second conductive insert 340. In other embodiments, the sealing device 300 does not have the second conductive insert 340, and the first conductive insert 310 is directly nested in the first rotating component 100.

[0043] Specifically, the elastic conductive member 320 has both elasticity and conductivity. The lip 322 in the elastic conductive member 320 is elastically pressed inwardly in the radial direction to the second rotating component 200, so that there is no gap between them.

[0044] The first conductive seal 380 has strength and rigidity to facilitate fixed connection with the first rotating component 100, and also has elasticity to cooperate with the second rotating component 200 for sealing.

[0045] Specifically, the elastic conductive member 320 is radially inwardly pressed against the outer wall 221 of the second rotating assembly 200 via the contact surface 326 to achieve a sealed fit. The conductive lubricant 370 is radially interposed between the elastic conductive member 320 and the outer wall 221 of the second rotating assembly 200. The elastic conductive member 320 is in direct conductive contact with the second rotating assembly 200 and / or is electrically conductively connected via the conductive lubricant 370. The conductive lubricant 370 can reduce the coefficient of kinetic friction between the elastic conductive member 320 and the second rotating assembly 200. In embodiments where the second rotating assembly 200 includes an oil slinger 220, the conductive lubricant 370 is used to reduce the coefficient of kinetic friction between the sealing device 300 and the oil slinger 220.

[0046] The conductive lubricant 370 is conductive and improves the electrical connection between the sealing device 300 and the second rotating assembly 200 compared to conventional lubricants.

[0047] The conductive lubricant 370 is filled in the groove 323 and / or attached to the bonding surface 326 in the following cases:

[0048] In some embodiments, the conductive lubricant 370 is only filled in the groove 323. The contact surface 326 of the elastic conductive member 320 contacts and electrically contacts the outer wall 221 of the second rotating assembly 200. The conductive lubricant 370 is sandwiched between the portion of the elastic conductive member 320 corresponding to the groove 323 and the outer wall 221 of the second rotating assembly 200, creating electrical conduction through the conductive lubricant 370. The conductive lubricant 370 reduces the coefficient of kinetic friction and provides electrical conduction.

[0049] In other embodiments, the conductive lubricant 370 is both filled in the groove 323 and attached to the contact surface 326. Figure 2 As shown in FIG. 3 , a conductive lubricant 370 is sandwiched between the elastic conductive member 320 and the second rotating assembly 200 , and the conductive lubricant 370 is electrically connected to the elastic conductive member 320 . The conductive lubricant 370 not only reduces the coefficient of kinetic friction but also provides electrical connection.

[0050] In other embodiments, the conductive lubricant 370 is attached only to the contact surface 326. The conductive lubricant 370 is sandwiched between the contact surface 326 of the elastic conductive member 320 and the outer wall 221 of the second rotating assembly 200, and electrical conduction is achieved through the conductive lubricant 370. The conductive lubricant 370 reduces the coefficient of kinetic friction and provides electrical conduction.

[0051] In the technical solution, the first rotating component 100 and the second rotating component 200 are electrically connected through the sealing device 300, so that the potential difference between the first rotating component 100 and the second rotating component 200 can be reduced. In addition, the electrically conductive lubricant 370 is arranged between the elastic conductive part 320 and the second rotating component 200, so that the frictional resistance is reduced under the premise of electrical conduction, thereby reducing the abrasion of the elastic conductive part 320.

[0052] In some embodiments, the electrically conductive lubricant 370 has fluidity. When the gap is formed between the abutting surface 326 and the outer wall surface 221, the electrically conductive lubricant 370 accommodated in the groove 323 fills into the gap between the abutting surface 326 and the outer wall surface 221. The electrically conductive lubricant 370 in the groove 323 serves as a reserve, and when the electrically conductive lubricant 370 between the abutting surface 326 and the outer wall surface 221 is reduced, the electrically conductive lubricant 370 in the groove 323 fills into the gap between the abutting surface 326 and the outer wall surface 221. In this way, the maintenance frequency can be reduced.

[0053] In some embodiments, the groove 323 is annularly arranged at the outer periphery of the reference axis L. By adopting the annular groove 323, the elastic conductive part 320 can be folded more easily, so that the second rotating component 200 can be better abutted. In some other embodiments, the groove 323 can be multiple, and the multiple grooves 323 are distributed in the abutting surface 326 in a multi-point manner. The specific shape of the groove 323 can be set as required.

[0054] Please refer to Figure 3 In some embodiments, the elastic conductive part 320 includes a main body part 321 and a lip part 322. The main body part 321 is connected to and electrically connected with the first conductive insert 310. The lip part 322 is connected to the main body part 321, and the lip part 322 has the groove 323 and the abutting surface 326. In a natural state, the lip part 322 extends away from the main body part 321.

[0055] Specifically, the main body part 321 is connected to the radially inner end of the first conductive insert 310, and the lip part 322 is located radially inside the main body part 321. In the natural state, the extension direction D3 of the lip part 322 is arranged obliquely relative to the reference axis L, and the inner periphery of the lip part 322 forms the abutting surface 326.

[0056] The natural state herein refers to the state of the lip part 322 when the sealing device 300 is not assembled between the first rotating component 100 and the second rotating component 200, i.e., the state of the lip part 322 under the action of no external force.

[0057] In some embodiments, the number of the grooves 323 is multiple, and in the natural state of the lip part 322, the multiple grooves 323 are arranged at intervals along the extension direction D3 of the lip part 322.

[0058] In the case of setting multiple grooves 323, the conductive lubricant 370 can be filled in some of the grooves 323, or can be filled in all of the grooves 323.

[0059] In the embodiments of the present application, the grooves 323 are set on the lip 322, which can not only store the conductive lubricant 370, but also reduce the structural strength of the lip 322, so that the lip 322 has good flexibility and is easy to bend, and the frictional resistance between the lip 322 and the second rotating component 200 can be reduced.

[0060] In some embodiments, the material of the elastic conductive member 320 includes conductive rubber. The conductive rubber is an elastic material with conductive properties. Ordinary rubber cannot be used in applications requiring conductive properties because it is not conductive, while the conductive rubber can conduct current to a certain extent. The conductive rubber is usually made by adding conductive particles to the rubber matrix. Common conductive particles include metal particles, carbon nanotubes, graphite, etc. The addition of these conductive particles makes the rubber a conductive network that can conduct current.

[0061] In some embodiments, the material of the conductive lubricant 370 includes graphite.

[0062] The conductive lubricant 370 mainly plays a conductive and lubricating role.

[0063] Specifically, in some embodiments, the conductive lubricant 370 is powdered graphite. In an assembly scenario, before assembly, the graphite is sprayed on the fitting surface 326 of the sealing device 300 (the lip 322), so that the surface of the fitting surface 326 is coated with graphite on one side, and the grooves 323 are filled with graphite. Then the sealing device 300 is fitted outside the second rotating component 200, so that the graphite on the fitting surface 326 is clamped between the fitting surface 326 and the outer wall surface 221, playing a conductive and lubricating role. In some embodiments, the thickness of the graphite on the fitting surface 326 is 3 to 10 microns.

[0064] In other embodiments, the conductive lubricant 370 can also be in a liquid state. That is, the conductive lubricant 370 is a conductive lubricating liquid. The conductive lubricating liquid is a lubricant with conductive properties. It adds conductive particles to the conventional lubricating liquid, so that it can lubricate while having conductive properties. For example, the conductive lubricating liquid is a carbon nanotube lubricating liquid. The carbon nanotube lubricating liquid uses carbon nanotubes as conductive particles and is added to the lubricating base to make it. For example, the conductive lubricating liquid is a graphite lubricant. The graphite lubricant uses graphite powder as conductive particles and is added to the lubricating base to make it.

[0065] In some embodiments, the electrically conductive lubricant 370 is in the form of a solid. For example, the electrically conductive lubricant 370 is in the form of a solid lubricant. The solid lubricant is generally made of a solid material, such as a metal, a ceramic, a polymer, a composite material, etc. For example, the solid lubricant is made of a metal, such as silver, copper, etc.

[0066] The specific form of the electrically conductive lubricant 370 is not limited, as long as it can conduct electricity and lubricate.

[0067] In some embodiments, the electrically conductive elastic member 320 is integrally formed with the first electrically conductive insert 310. Specifically, in embodiments where the electrically conductive elastic member 320 is made of an electrically conductive rubber and the first electrically conductive insert 310 is made of a metal, the electrically conductive elastic member 320 is integrally formed with the first electrically conductive insert 310, so that a better sealing effect can be achieved between the electrically conductive elastic member 320 and the first electrically conductive insert 310, and a better electrically conductive contact effect can also be achieved between the electrically conductive elastic member 320 and the first electrically conductive insert 310.

[0068] Please refer to Figure 2 In some embodiments, the sealing device 300 further comprises an elastic member 330. The elastic member 330 is sleeved on the outer periphery of the lip portion 322. The elastic member 330 can elastically contract radially inwardly to press the lip portion 322 against the second rotating component 200.

[0069] In some embodiments, the elastic member 330 is a spring, which spirally extends along a track line around the reference axis L. In some other embodiments, the elastic member 330 is a rubber ring.

[0070] Under the action of the elastic member 330, the lip portion 322 can be elastically pressed against the second rotating component 200, which not only ensures the sealing effect, but also reduces the leakage of the electrically conductive lubricant 370 from between the lip portion 322 and the second rotating component 200.

[0071] Please refer to Figure 4 , Figure 4 is a sectional view of the second electrically conductive sealing member 390 and the elastic member 330 in the embodiments of the present application.

[0072] In some embodiments, the sealing device 300 further comprises a second electrically conductive sealing member 390. The second electrically conductive sealing member 390 is annularly arranged around the outer periphery of the reference axis L. The second electrically conductive sealing member 390 is connected to and electrically conductive with the first rotating component 100. The second electrically conductive sealing member 390 is sleeved on the second rotating component 200, and forms a labyrinth sealing structure with the second rotating component 200.

[0073] The second conductive seal 390 includes the second conductive insert 340 and the flexible seal 350. The second conductive insert 340 is connected to the first rotating assembly 100. The flexible seal 350 is arranged between the first rotating assembly 100 and the second rotating assembly 200. The flexible seal 350 includes a first portion 351 and a second portion 352. The first portion 351 is connected to the second conductive insert 340, and the second portion 352 is closer to the second rotating assembly 200 than the first portion 351. The elastic member 330 is sleeved on a side of the second portion 352 away from the second rotating assembly 200.

[0074] Specifically, the second conductive insert 340 is made of metal. The second conductive insert 340 is nested with the first rotating assembly 100 around the reference axis L and electrically contacts. The second conductive insert 340 is rigid, and the nested connection with the first rotating assembly 100 is easier to assemble. The flexible seal 350 is flexible. In some embodiments, the flexible seal 350 is made of rubber. The flexible seal 350 is arranged on the outer side of the elastic conductive member 320 in the radial direction and forms a labyrinth seal structure with the second rotating assembly 200 to block external impurities from entering the elastic conductive member 320.

[0075] With the flexible seal 350, the elastic member 330 is sleeved on the flexible seal 350 and is pressed against the lip 322 by the flexible seal 350. Specifically, the flexible seal 350 is provided with an annular groove, and the elastic member 330 is accommodated in the annular groove. In this way, the position of the elastic member 330 is more fixed.

[0076] Please refer to Figure 1 and Figure 2 In some embodiments, in the case that the sealing device 300 has the first conductive seal 380 and the second conductive seal 390, the sealing device 300 further includes a flexible conductive member 360. The flexible conductive member 360 is made of conductive material and is arranged between the first conductive seal 380 and the second conductive seal 390. The conductivity of the flexible conductive member 360 is greater than that of the elastic conductive member 320. The flexible conductive member 360 is flexible. For example, the flexible conductive member 360 is a sheet of copper material, or a copper mesh. Under the action of the extrusion force, the flexible conductive member 360 can tightly fit the first conductive seal 380 and electrically contact the first conductive seal 380.

[0077] In the case that the flexible conductive member 360 is not arranged, the electric current is transmitted through the elastic conductive member 320. After the flexible conductive member 360 is arranged, at least part of the electric current is transmitted through the flexible conductive member 360. The conductive performance of the flexible conductive member 360 is better than that of the elastic conductive member 320, thereby improving the conductive effect of the sealing device 300.

[0078] Please refer to Figures 5 to 7. Figure 5 is a schematic view of a three-dimensional structure of the flexible conductive member 360 in an embodiment of the present application. Figure 6 is a sectional view of the flexible conductive member 360 in an embodiment of the present application. Figure 7 is a schematic view of a three-dimensional structure of the sealing device 300 and the oil slinger 220 in an embodiment of the present application. In order to show the interference fit amount between the first conductive sealing member 380 and the oil slinger 220, Figure 7 in which the elastic conductive member 320 in the first conductive sealing member 380 is in a natural state without external force.

[0079] The flexible conductive member 360 includes a first sub-portion 361 on the radially outer side and a second sub-portion 362 on the radially inner side, which are arranged at a preset angle and connected to each other. The included angle between the first sub-portion 361 and the second sub-portion 362 is α.

[0080] Specifically, the flexible conductive member 360 is annularly arranged outside the reference axis L. The first sub-portion 361 and the second sub-portion 362 are annular respectively. In some embodiments, the flexible conductive member 360 is a sheet-shaped body of revolution, and the thickness ranges from 0.05 mm to 0.5 mm. The thickness is for example 0.05 mm, 0.07 mm, 0.1 mm, 0.2 mm, 0.25 mm, 0.35 mm, 0.45 mm or 0.5 mm. The flexible conductive member 360 adopts an annular structure, which can increase the contact area of the flexible conductive member 360 and the elastic conductive member 320, thereby improving the conductive effect. In other embodiments, the flexible conductive member 360 can also adopt a non-annular structure.

[0081] The flexible conductive member 360 is sleeved outside the elastic conductive member 320. The first sub-portion 361 is in conductive contact with the radially outer end 324 of the elastic conductive member 320. The second sub-portion 362 is in conductive contact with the radially inner end 327 of the elastic conductive member 320. In the embodiment in which the elastic conductive member 320 includes the main body portion 321 and the lip portion 322, the first sub-portion 361 is in conductive contact with the axially outer end surface of the main body portion 321, and the second sub-portion 362 is in conductive contact with the radially outer circumferential surface of the lip portion 322.

[0082] Since the current is transmitted in the radial direction, the flexible conductive member 360 is in conductive contact with the two ends of the elastic conductive member 320 respectively, which can make the current transmitted through the flexible conductive member 360 as much as possible and transmitted through the elastic conductive member 320 as little as possible.

[0083] The first sub-portion 361 and the second sub-portion 362 are arranged at a preset angle, so that the surface shape of the flexible conductive member 360 and the elastic conductive member 320 is more matched, thereby being able to increase the contact area and further improve the conductive effect.

[0084] The included angle between the first sub-portion 361 and the second sub-portion 362 changes with the shape of the elastic conductive member 320. After the flexible conductive member 360 is assembled to the second rotating assembly 200, the extended end of the lip portion 322 in the flexible conductive member 360 is folded outward in the radial direction, and the end of the second sub-portion 362 away from the first sub-portion 361 is also folded outward in the radial direction, so that the included angle between the first sub-portion 361 and the second sub-portion 362 decreases. The flexible conductive member 360 is flexible, and is also more likely to change in shape to fit the elastic conductive member 320.

[0085] The shape of the flexible conductive member 360 changes before and after assembly, so that the inner diameter of the end of the second sub-portion 362 away from the first sub-portion 361 also changes. In addition, in the assembled state, the second sub-portion 362 is pressed against the lip portion 322 in the radial direction, and because the lip portion 322 is elastic, its thickness changes under the pressing force, causing the inner diameter of the end of the second sub-portion 362 away from the first sub-portion 361 to also change. Specifically, because the elastic member 330 exerts a radial inward pressing force on the second portion 352 of the flexible sealing member 350, the second sub-portion 362 of the flexible conductive member 360 is pressed against the lip portion 322 under the action of the pressing force.

[0086] To enable the end of the second sub-portion 362 away from the first sub-portion 361 to adapt to the change in inner diameter and always fit the lip portion 322, embodiments of the present application are further improved as follows.

[0087] In some embodiments, the first sub-portion 361 is annularly arranged outside the reference axis L, and the second sub-portion 362 includes a plurality of notches 363 distributed in the circumferential direction, the notches 363 being arranged at the edge of the end of the second sub-portion 362 away from the first sub-portion 361.

[0088] Because of the notches 363, the end of the second sub-portion 362 away from the first sub-portion 361 can adaptively adjust the size of the inner diameter to always fit the lip portion 322.

[0089] Please refer to Figure 8 . Figure 8 is Figure 1 an enlarged view of the partial view B. To improve the effect of the radial outer end 324 of the elastic conductive member 320 in electrically contacting the flexible conductive member 360, in some embodiments, the radial outer end 324 has a protrusion 325, the first sub-portion 361 of the flexible conductive member 360 and the radial outer end 324 are arranged between the first conductive insert 310 and the second conductive insert 340, and are in electrically conductive contact through the protrusion 325. Further, the protrusion 325 protrudes in the axial direction of the second rotating assembly 200 and is annularly arranged in the circumferential direction of the second rotating assembly 200. The first conductive insert 310 and the second conductive insert 340 clamp the first sub-portion 361 and the radial outer end 324 in the axial direction.

[0090] Compared with the face-to-face contact mode, the radial outer end 324 of the elastic conductive member 320 is in contact with the flexible conductive member 360 through the protrusion 325, which improves the effect of conductive contact.

[0091] In summary, in the embodiment of the application, the first rotating assembly 100 and the second rotating assembly 200 are electrically connected through the sealing device 300, so that the potential difference between the first rotating assembly 100 and the second rotating assembly 200 can be reduced. In addition, the conductive lubricant 370 is arranged between the sealing device 300 and the second rotating assembly 200, which reduces the frictional resistance under the premise of ensuring electrical connection, thereby reducing the wear of the sealing device 300.

[0092] Please refer to FIG. 3 and FIG. 4 Figure 7 In some embodiments, in the axial direction of the second rotating assembly 200, the sealing device 300 is provided with a pump oil groove 328 on the side close to the rotating cavity 101. The pump oil groove 328 is open towards the rotating cavity 101 and open towards the second rotating assembly 200. The wall surface of the pump oil groove 328 relative to the second rotating assembly 200 includes an inclined surface 3281, which is arranged obliquely relative to the reference axis L. In the axial direction of the second rotating assembly 200, the size of the inclined surface 3281 from the reference axis L gradually increases. When the bearing rotates at high speed, under the action of centrifugal force, the lubricating grease in the pump oil groove 328 moves into the rotating cavity 101 under the guidance of the inclined surface 3281, thereby reducing the accumulation of lubricating grease at the sealing device 300.

[0093] Specifically, the number of pump oil grooves 328 is multiple, and the multiple pump oil grooves 328 are arranged at intervals in the circumferential direction of the second rotating assembly 200. The pump oil groove 328 is arranged on the main body part 321 of the elastic conductive member 320.

[0094] In some embodiments, in the radial direction of the second rotating assembly 200, the sealing device 300 is provided with a labyrinth groove 329 on the side towards the second rotating assembly 200. The labyrinth groove 329 can further prevent the lubricating grease inside the bearing from leaking. Specifically, the labyrinth groove 329 is arranged on the side of the main body part 321 towards the second rotating assembly 200 and is arranged around the reference axis L. In the axial direction of the second rotating assembly 200, the labyrinth groove 329 is arranged outside the pump oil groove 328 and inside the lip part 322.

[0095] Please refer to FIG. 5 Figure 9 , Figure 9 is a cross-sectional structure schematic diagram of another embodiment of the bearing of the application.

[0096] In some other embodiments, the bearing comprises a first rotating component 100, a second rotating component 200, and a sealing device 300. The second rotating component 200 encloses a rotating cavity 101. The first rotating component 100 is rotatably arranged in the rotating cavity 101. The sealing device 300 is annularly arranged outside the reference axis L. The sealing device 300 is arranged between the first rotating component 100 and the second rotating component 200 to seal the gap between the first rotating component 100 and the second rotating component 200, and the sealing device 300 electrically connects the first rotating component 100 and the second rotating component 200.

[0097] The sealing device 300 comprises a first conductive insert 310, an elastic conductive member 320, and a conductive lubricant (not shown).

[0098] The first conductive insert 310 is made of conductive material and annularly arranged outside the reference axis L. The first conductive insert 310 is connected to and electrically connected with the first rotating component 100.

[0099] The elastic conductive member 320 is made of conductive material and annularly arranged outside the reference axis L. The elastic conductive member 320 is connected to and electrically connected with the first conductive insert 310. The elastic conductive member 320 comprises a main body 321 and a lip 322. The main body 321 is connected to and electrically connected with the first conductive insert 310. The main body 321 is connected to the radially outer end of the first conductive insert 310. The lip 322 is connected to the main body 321. The lip 322 is located radially outside the main body 321. In a natural state, the lip 322 extends away from the main body 321. The extending direction D3 of the lip 322 is obliquely arranged relative to the reference axis L. The outer circumferential surface of the lip 322 forms a fitting surface 326. The lip 322 is elastically pressed against the inner circumferential surface of the second rotating component 200 in a radially outward direction to sealingly engage with the second rotating component 200. At least one groove 323 is formed on the fitting surface 326 of the elastic conductive member 320.

[0100] The conductive lubricant 370 is made of conductive material and filled in the groove 323 and / or attached to the fitting surface 326.

[0101] Figure 9 The bearing shown in the figure is different from the bearing shown in the figure in that the relative positions of the first rotating component 100 and the second rotating component 200 are reversed, and the structure of the sealing device 300 is correspondingly adjusted. Figure 1 The rest of the structure of the sealing device 300 in the bearing shown in the figure can refer to the sealing device 300 in the bearing shown in the figure, which will not be described here. Figure 9 The rest of the structure of the sealing device 300 in the bearing shown in the figure can refer to the sealing device 300 in the bearing shown in the figure, which will not be described here. Figure 1 The rest of the structure of the sealing device 300 in the bearing shown in the figure can refer to the sealing device 300 in the bearing shown in the figure, which will not be described here.

[0102] The sealing device in each of the above embodiments is not limited to application to bearings. For example, the first rotating component is a shaft seat, the second rotating component is a shaft that is inserted into a mounting hole of the shaft seat, and the sealing device can seal a gap between the shaft and the shaft seat.

[0103] In summary, the sealing device provided by the embodiments of the present application can seal a gap between the first rotating component and the second rotating component, and can also electrically conduct the first rotating component and the second rotating component to reduce a potential difference between the first rotating component and the second rotating component. In addition, the electrically conductive lubricant is arranged between the elastic conductive member and the second rotating component, which ensures electrical conduction and reduces frictional resistance, thereby reducing wear of the elastic conductive member.

[0104] The above steps provide an introduction for helping to understand the method, structure and core idea of the present application. For those skilled in the art, some improvements and modifications can be made to the present application without departing from the principles of the present application, and these improvements and modifications also belong to the scope of protection of the claims of the present application.

Claims

1. A sealing device for sealing a gap between a first rotating member and a second rotating member capable of relative rotation, characterized by The sealing device is annularly arranged outside the reference axis, and comprises a first conductive sealing member, which comprises: a first conductive insert made of conductive material, which is electrically connected with the first rotating component; an elastic conductive member made of conductive material, which is electrically connected with the first conductive insert and has a contact surface for sealingly contacting the second rotating component, and is provided with at least one groove on the contact surface; a conductive lubricating member made of conductive material, which is filled in the groove and / or attached to the contact surface.

2. The sealing device according to claim 1, wherein: the grooves are annularly arranged outside the reference axis.

3. The sealing device according to claim 1, wherein: the elastic conductive member comprises a main body and a lip, the main body is electrically connected with the first conductive insert, the lip is connected with the main body, the lip has the grooves and the contact surface, and in a natural state, the lip extends away from the main body; the number of the grooves is plural, and in the natural state of the lip, the plural grooves are arranged in the extension direction of the lip.

4. The sealing device according to claim 3, wherein: the main body is connected to the radially inner end of the first conductive insert, the lip is located radially inside the main body, in the natural state, the extension direction of the lip is arranged obliquely relative to the reference axis, and the inner circumferential surface of the lip forms the contact surface.

5. The sealing device according to claim 1, wherein: the material of the elastic conductive member comprises conductive rubber, and the material of the conductive lubricating member comprises graphite.

6. The sealing device of claim 1, wherein The sealing device further comprises: a second conductive sealing member, which is electrically connected with the first rotating component; a flexible conductive member made of conductive material, which is arranged between the first conductive sealing member and the second conductive sealing member, and has a higher electrical conductivity than the elastic conductive member of the first conductive sealing member.

7. The sealing device according to claim 6, wherein: the flexible conductive member comprises a first sub-member on the radially outer side and a second sub-member on the radially inner side, and the first sub-member and the second sub-member are arranged at a preset angle and connected with each other.

8. The sealing device according to claim 7, wherein: the first sub-member is annularly arranged outside the reference axis, and the second sub-member comprises a plurality of notches distributed in the circumferential direction, and the notches are arranged at the edge of the end of the second sub-member away from the first sub-member.

9. The sealing device according to claim 7, wherein: the elastic conductive member has a radially outer end provided with a protrusion, the first sub-member is in electrically conductive contact with the elastic conductive member through the protrusion, and the second sub-member is in electrically conductive contact with the radially inner end of the elastic conductive member.

10. A bearing, characterized by comprises: a first rotating component; a second rotating component, the first rotating component and the second rotating component can rotate relative to each other; A sealing device for sealing a gap between the first rotating component and the second rotating component and electrically conducting with the first rotating component and the second rotating component respectively, the sealing device being any one of the sealing devices of claims 1 to 9.

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