Oil seal assembly and motor driving system

Abstract

The utility model discloses an oil seal assembly and a motor driving system. The oil seal assembly comprises an annular body and a conductive structure, the annular body is used for being arranged on a motor rotating shaft in a sleeving mode, the conductive structure wraps the circumferential side of the annular body and makes conductive contact with the motor rotating shaft, and the conductive structure is used for leading out shaft current of the motor rotating shaft to a grounded metal part. Therefore, the shaft current flowing through the motor rotating shaft is reduced, so that the risk of electrocorrosion of the motor bearing is reduced, and the service life of the motor bearing is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of oil seals, and in particular to an oil seal assembly and a motor drive system. Background Art

[0002] In the vehicle's drive system, the motor shaft of the motor generates shaft current during rotation, and the shaft current flows through the reducer input shaft connected to the motor shaft. When a large shaft current flows through the bearings sleeved on the motor shaft or the bearings sleeved on the reducer input shaft, these bearings are easily corroded by electricity, thereby reducing the service life of these bearings. Utility Model Content

[0003] The present application provides an oil seal assembly and a motor drive system to solve at least one of the above-mentioned technical problems.

[0004] An embodiment of the present application provides an oil seal assembly, which includes an annular body and a conductive structure. The annular body is used to be sleeved on a motor shaft. The conductive structure is coated on the circumference of the annular body and is in conductive contact with the motor shaft. The conductive structure is used to conduct the shaft current of the motor shaft to a grounded metal component.

[0005] An embodiment of the present application further provides a motor drive system, which includes a motor shaft and the oil seal assembly as described above.

[0006] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0008] Figure 1 is a schematic structural diagram of an oil seal assembly according to an embodiment of the present application;

[0009] Figure 2 is a schematic structural diagram of a drive system according to an embodiment of the present application;

[0010] Figure 3 yes Figure 2 A magnified view of part a of the drive system;

[0011] Figure 4 yes Figure 2 A magnified view of part b of the drive system;

[0012] Figure 5 yes Figure 2 An enlarged view of part c of the drive system;

[0013] Figure 6 is a schematic structural diagram of an insulation assembly according to an embodiment of the present application;

[0014] Figure 7 yes Figure 2 An enlarged view of part d of the drive system;

[0015] Figure 8 It is a schematic diagram of a vehicle according to an embodiment of the present application.

[0016] Description of reference numerals:

[0017] Electric drive system 100; oil seal assembly 200; motor device 10; motor housing 11; motor shaft 12; first bearing 13; first end 120 of motor shaft; motor controller 14; stator assembly 15; stator housing 110; reducer device 20; reducer housing 21; reducer input shaft 22; second bearing 23; conductive structure 30; front housing 210; second end 121 of motor shaft; annular conductor portion 31; radial conductor portion 32; mounting hole 101; connecting portion 320; conductive brush 321; annular body 33; annular body 330; skeleton 331 ; first lip 3300; second lip 3301; isolation space 34; insulating component 16; steel sleeve 160; resin layer 161; second conductive structure 24; rear box body 211; first end 220 of reducer input shaft; second end 221 of reducer input shaft; reducer gear shaft assembly 25; conductive baffle 240; spring 241; conductive pin 242; first end 2420 of conductive pin; second end 2421 of conductive pin; main body 2110; protrusion 2111; mounting groove 2112; bottom wall 2113 of mounting groove; side wall 2114 of mounting groove; vehicle 1000. DETAILED DESCRIPTION

[0018] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0019] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may 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 clearly and specifically defined.

[0020] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0021] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0022] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the various specific processes and material examples provided by the present application, but those of ordinary skill in the art can appreciate the application of other processes and / or the use of other materials.

[0023] See also Figures 1 to 8 The embodiment of the present application provides an oil seal assembly 200, the oil seal assembly 200 includes an annular body and a conductive structure, the annular body is used to be sleeved on the motor shaft, the conductive structure is coated on the circumference of the annular body and is in conductive contact with the motor shaft, and the conductive structure is used to conduct the shaft current of the motor shaft to a grounded metal component. In this way, the shaft current flowing through the motor shaft is reduced, thereby reducing the risk of electrical corrosion of the motor bearing and increasing the service life of the motor bearing.

[0024] In some embodiments, see Figure 2 and Figure 3 The electric drive system 100 of the embodiment of the present application includes a motor device 10, a reducer device 20 and a conductive structure 30. The motor device 10 includes a motor housing 11, a motor shaft 12 and a first bearing 13. The motor shaft 12 is rotatably disposed on the motor housing 11. The first bearing 13 is sleeved on a first end 120 of the motor shaft 12.

[0025] The reducer device 20 includes a reducer housing 21, a reducer input shaft 22, and a second bearing 23. The reducer housing 21 is fixedly connected to the motor housing 11 and can be in conductive contact. The reducer input shaft 22 is rotatably arranged on the reducer housing 21. The reducer input shaft 22 is fixedly connected to the first end 120 of the motor shaft 12 and can be in conductive contact. The second bearing 23 is sleeved on one end of the reducer input shaft 22 close to the motor shaft 12.

[0026] The oil seal assembly 200 is sleeved on the first end 120 of the motor shaft 12 and is located in the gap between the first bearing 13 and the second bearing 23. The conductive structure 30 can be conductively contacted with the motor shaft 12 and can be conductively contacted with the motor housing 11 or the reduction gearbox housing 21. At least one of the motor housing 11 and the reduction gearbox housing 21 is grounded.

[0027] In the electric drive system 100 of the embodiment of the present application, the shaft current can be guided to the grounded motor housing 11 and the reduction gearbox housing 21 through the conductive structure 30, reducing the current flowing through the first bearing 13 and the second bearing 23, thereby reducing the risk of electrical corrosion of the first bearing 13 and the second bearing 23 and improving the service life of the first bearing 13 and the second bearing 23.

[0028] Specifically, the motor device 10 can be a DC motor, an AC motor, a stepper motor, or other different types of motors. The motor device 10 can also include a motor controller 14, which can control the rotation of the motor shaft 12 through a variety of control techniques. For example, the rotation of the motor shaft 12 can be controlled through pulse width modulation technology.

[0029] During the operation of the motor device 10, the motor controller 14 generates shaft current on the motor shaft 12 when controlling the rotation of the motor shaft 12. If the shaft current is not processed, the shaft current will pass through the first bearing 13 sleeved on the motor shaft 12 and the second bearing 23 sleeved on the reducer input shaft 22, which will cause the insulating oil film formed between the rollers in the first bearing 13 and the second bearing 23 and the surfaces in contact with the rollers to be electrically broken down, resulting in discharge, thereby causing electrical corrosion of the first bearing 13 and the second bearing 23.

[0030] The motor housing 11 is the external structural part of the motor device 10, and plays the role of supporting and protecting the internal components of the motor device 10. The motor shaft 12 is the rotating part of the motor device 10, and is arranged inside the motor housing 11. The first end 120 of the motor shaft 12 refers to the end of the motor shaft 12 close to the reducer device 20. The first bearing 13 may include one or more bearings, and the first bearing 13 is used to support the rotating part of the motor shaft 12, reduce friction and ensure accurate positioning. The first bearing 13 can be a rolling bearing, a sliding bearing, etc.

[0031] The reducer device 20 is used to reduce the speed output by the motor device 10 and increase the torque. The reducer housing 21 is the external structural part of the reducer device 20 and plays a role in supporting and protecting the internal components of the reducer.

[0032] The reducer input shaft 22 is a shaft connecting the motor shaft 12 and the reducer gear shaft assembly 25, and transmits the rotational motion of the motor shaft 12. During the rotation of the motor shaft 12, the shaft current generated by the motor shaft 12 will flow to the reducer input shaft 22, which is easy to cause electrical corrosion to the second bearing 23 sleeved on the reducer input shaft 22.

[0033] The conductive structure 30 provides a flow path for the shaft current. When the current flows through the first bearing 13, the second bearing 23 and the conductive structure 30 at the same time, the first bearing 13, the second bearing 23 and the conductive structure 30 are connected in parallel, and the conductive structure 30 can be used for current diversion, thereby reducing the current flowing through the first bearing 13 or the second bearing 23.

[0034] The conductive structure 30 may be a conductive ring or other conductive structure sleeved on the first end 120 of the motor shaft 12. For example, the conductive structure 30 may be a conductive ring, the inner ring of which may be sleeved on the first end 120 of the motor shaft 12, and the outer ring of which may be provided with a brush, which may be used to conductively contact the motor housing 11.

[0035] The motor device 10 may further include a stator assembly 15, and the motor housing 11 may further include a stator housing 110. The stator housing 110 is a fixed part of the motor device 10, which may be fixed to the external frame of the motor device 10, and the stator assembly 15 is installed inside. The stator housing 110 may provide support and protection for the stator assembly 15, and at the same time be connected to the external structure of the motor device 10 to ensure the stability of the motor as a whole. The stator housing 110 may be in conductive contact with the reduction box housing 21. The stator assembly 15 may generate a rotating magnetic field, and the stator assembly 15 may interact with the motor shaft 12 to realize the rotation of the motor shaft 12.

[0036] Conductive contact refers to a connection method that forms a current path between two conductors. Conductive contact can be achieved by welding, bolt connection, direct contact, etc. For example, the conductive contact between the conductive structure 30 and the motor shaft 12 can be achieved by direct contact.

[0037] See also Figure 1 , Figure 3 and Figure 4 In some embodiments, the reduction box housing 21 includes a front housing 210 connected to the motor housing 11, the front housing 210 is fixedly connected to the motor housing 11 and can be in conductive contact, the first bearing 13 and the second bearing 23 are both mounted on the front housing 210, and the first conductive structure 30 can be in conductive contact with the front housing 210;

[0038] In some embodiments, the motor housing 11 includes an end cover connected to the reduction box housing 21, the first bearing 13 and the second bearing 23 are both mounted on the end cover, and the conductive structure 30 is in conductive contact with the end cover;

[0039] In some embodiments, the reduction gearbox housing 21 includes a front housing 210 docked with the motor housing 11, the motor housing 11 includes an end cover docked with the front housing 210, the first bearing 13 is mounted on the end cover, the second bearing 23 is mounted on the front housing 210, and the first conductive structure 30 is conductively contacted with the end cover or the front housing 210.

[0040] In this way, the shaft current generated on the motor shaft 12 can be conducted to the front box body 210 through the first conductive structure 30, or conducted to the end cover through the conductive structure 30, which can reduce the current passing through the first bearing 13 and the second bearing 23, thereby reducing the risk of electrical corrosion of the first bearing 13 and the second bearing 23, and improving the service life of the first bearing 13 and the second bearing 23.

[0041] Specifically, the front housing 210 may be a part of the reducer close to the motor shaft 12, and the front housing 210 may be connected to the motor housing 11 by bolt connection, welding, etc. The first bearing 13 and the second bearing 23 may be mounted on the front housing 210 by means of shaft hole matching. The end cover is used to close the motor device 10 to protect the internal components of the motor device 10 or provide additional support. The end cover and the front housing 210 may be connected through the stator housing 110.

[0042] See also Figure 2 and Figure 5 In some embodiments, the first bearing 13 may also be sleeved on the second end 121 of the motor shaft 12 .

[0043] See also Figure 3 In some embodiments, the conductive structure 30 includes an annular conductor portion 31 and a radial conductor portion 32 fixed to the inner side of the annular conductor portion 31 and conductively contacted therewith. The radial conductor portion 32 is conductively contacted with the motor shaft 12, and the annular conductor portion 31 is conductively contacted with the motor housing 11 or the reduction gear housing 21. The motor housing 11 or the reduction gear housing 21 is provided with a mounting hole 101 fixedly matched with the annular conductor portion 31.

[0044] In this way, the shaft current can flow to the annular conductor portion 31 through the radial conductor portion 32, and then flow to the motor housing 11 or the reduction gearbox housing 21 through the annular conductor portion 31, which provides an additional shaft current flow path, thereby reducing the current flowing through the first bearing 13 and the second bearing 23, thereby reducing the risk of electrical corrosion of the first bearing 13 and the second bearing 23, and improving the service life of the first bearing 13 and the second bearing 23.

[0045] In addition, the mounting hole 101 is used to fix the annular conductor portion 31 , which enables the annular conductor portion 31 to be in stable contact with the motor housing 11 or the reduction box housing 21 , thereby reducing the probability of contact failure.

[0046] Specifically, the radial conductor portion 32 and the annular conductor portion 31 are both made of conductive materials for passing current. The radial conductor portion 32 and the annular conductor portion 31 can be made of the same material or different materials. For ease of manufacturing, the radial conductor portion 32 and the annular conductor portion 31 can be an integrally formed metal part. For ease of maintenance and replacement, the radial conductor portion 32 and the annular conductor portion 31 can also be separately formed, and when maintenance or replacement is required, only one part needs to be operated.

[0047] The shape of the mounting hole 101 can be similar to that of the annular conductor portion 31. The diameter of the mounting hole 101 can be equal to the outer diameter of the annular conductor portion 31, or smaller than the outer diameter of the annular conductor portion 31, thereby forming a transition fit or an interference fit, so that the annular conductor portion 31 and the mounting hole 101 are fixedly matched. In addition, the mounting hole 101 and the annular conductor portion 31 can also be fixedly connected by fasteners such as screws and bolts.

[0048] See also Figure 3 In some embodiments, the radial conductor portion 32 includes a connecting portion 320 and a conductive brush 321 that can be in conductive contact with the connecting portion 320. One end of the connecting portion 320 is connected to the annular conductor portion 31, and the other end extends toward the direction close to the motor shaft 12. The conductive brush 321 is connected to one end of the connecting portion 320 close to the motor shaft 12, and the conductive brush 321 can be in conductive contact with the motor shaft 12.

[0049] In this way, the use of the conductive brush 321 can reduce the mechanical wear between the radial conductor part 32 and the motor shaft 12, because the conductive brush 321 can provide stable contact when the motor shaft 12 rotates, and will not produce large friction and wear like a hard connection, and has a longer service life, which can reduce the probability of conductive contact failure between the radial conductor part 32 and the motor shaft 12. In addition, the conductive brush 321 is easy to replace after being worn, which simplifies the maintenance process and reduces maintenance costs.

[0050] The connecting portion 320 is used to connect the conductive brush 321 and the annular conductor portion 31 to ensure continuous transmission of current. The conductive brush 321 can be arranged on the end surface of the connecting portion 320 close to the motor shaft 12, and the conductive brush 321 and the connecting portion 320 can be connected by bonding, welding, etc. The conductive brush 321 can be made of materials such as copper and silver.

[0051] In some embodiments, the conductive brush 321 is made of carbon fiber material. As such, the carbon fiber material has good electrical conductivity, and the conductive brush 321 made of the carbon fiber material can ensure efficient transmission of current from the motor shaft 12 to the radial conductor portion 32 .

[0052] In addition, the carbon fiber material has high wear resistance, which makes the conductive brush 321 made of carbon fiber material have a longer service life, so that it can maintain the conductive performance during long-term operation and maintain the stability of the conductive contact between the conductive brush 321 and the motor shaft 12.

[0053] See also Figure 3 In some embodiments, the conductive structure 30 includes an annular body 33, the annular body 33 includes an annular body 330, the annular body 330 is sleeved on the first end 120 of the motor shaft 12, and is used to isolate the inner cavity of the motor housing 11 from the inner cavity of the reduction gear housing 21, the annular conductor portion 31 is covered on the circumference of the annular body 330, part of the radial conductor portion 32 is embedded in the annular body 330, and part of the radial conductor portion 32 extends out of the annular body 330 to contact the motor shaft 12.

[0054] In this way, the annular body 33 can prevent the leakage of lubricating oil and the entry of impurities. By introducing the radial conductor part 32 and the annular conductor part 31 , the annular body 33 not only provides a sealing function but also integrates a conductive function, which reduces the need for additional conductive components.

[0055] The annular conductor portion 31 wrapped around the circumference of the annular body 330 can provide electrical connection without damaging the sealing performance of the annular body 330. The annular body 330 can provide support for the annular conductor portion 31 to maintain the stability of the conductive contact between the annular conductor portion 31 and the motor housing 11 or the reduction gearbox housing 21.

[0056] Since the radial conductor portion 32 is embedded in the annular body 330 , the annular body 330 can fix the radial conductor portion 32 and reduce the adverse effects of external environmental factors on the radial conductor portion 32 .

[0057] Specifically, the annular body 330 is the main part of the annular body 33, and can be made of a flexible material to adapt to the rotational movement of the shaft and provide sealing. For example, the annular body 330 can be made of rubber, polyurethane or other flexible materials, and has good sealing performance and durability.

[0058] In one embodiment, the connection portion 320 and the annular conductor portion 31 may be conductive metal plates. The connection portion 320 and the annular conductor portion 31 may form an L-shaped structure, and the annular body 330 may be in a circular ring shape. The connection portion 320 may be the long side of the L-shaped structure, and the annular conductor portion 31 may be the short side of the L-shaped structure. The connection portion 320 and the annular conductor portion 31 may be fixed together with the annular body 330 through a vulcanization process.

[0059] The connection part 320 may extend from the inside of the annular body 330 and extend toward the motor shaft 12. The annular conductor part 31 may be located on one side of the outer edge of the annular body 330 and fit with the surface of the reduction gearbox housing 21. A positioning groove may be provided on the end surface of the connection part 320 close to the motor shaft 12, and glue may be filled in the positioning groove, and then the conductive brush 321 may be installed in the positioning groove and fixed by press fitting.

[0060] See also Figure 2 In some embodiments, the annular body 33 also includes a skeleton 331, which is embedded in the interior of the annular body 330. The skeleton 331 is used to support the annular body 330. The skeleton 331 and the radial conductor portion 32 at least partially overlap in the radial direction of the annular body 330, thereby enhancing the structural stability of the radial conductor portion 32.

[0061] In this way, the skeleton 331 of the annular body 33 supports the annular body 330 , thereby enhancing the structural stability of the annular body 33 , helping to maintain the shape and position of the annular body 33 when the motor shaft 12 rotates, and ensuring the conductivity and sealing performance of the annular body 33 .

[0062] In addition, the skeleton 331 can provide support for the radial conductor portion 32 in the radial direction of the annular body 330 , thereby ensuring the stability of the radial conductor portion 32 .

[0063] Specifically, the skeleton 331 may be made of metal or plastic, such as aluminum alloy, stainless steel or other metal materials. Along the radial direction of the annular body 330 , the orthographic projections of the skeleton 331 and the radial conductor portion 32 have an overlapping area.

[0064] See also Figure 3 In some embodiments, a first lip 3300 and a second lip 3301 are formed on one side of the annular body 330 close to the motor shaft 12. The first lip 3300 and the second lip 3301 are arranged side by side in the axial direction of the motor shaft 12. The first lip 3300 and the second lip 3301 are both in sealing contact with the circumferential surface of the motor shaft 12. A gap is set between the first lip 3300 and the second lip 3301 to form an isolation space 34. The portion of the radial conductor portion 32 that contacts the motor shaft 12 is located in the isolation space 34.

[0065] In this way, the first lip 3300 and the second lip 3301 are in sealing contact with the circumferential surface of the motor shaft 12, providing a double seal. The first lip 3300 can prevent metal impurities in the motor device 10 from contacting the radial conductor portion 32, thereby reducing the probability of the second lip 3301 being damaged and improving the sealing stability of the second lip 3301. The second lip 3301 can prevent the oil in the reducer device 20 from entering the motor device 10.

[0066] In addition, the isolation space 34 between the first lip 3300 and the second lip 3301 provides a protected environment for the conductive brush 321. The isolation space 34 helps to isolate the conductive brush 321 from the external environment, thereby preventing foreign objects from the motor device 10 or the reducer device 20 from interfering with and damaging the conductive brush 321.

[0067] Specifically, the first lip 3300 can be arranged close to the motor device 10, and the second lip 3301 can be arranged close to the reducer device 20. The isolation space 34 is a closed space defined by the first lip 3300, the second lip 3301 and the circumferential surface of the motor shaft 12. The first lip 3300 and the second lip 3301 are both annular structures.

[0068] See also Figure 3 , Figure 5 and Figure 6 In some embodiments, the motor device 10 further includes an insulating component 16 , which is disposed between the first bearing 13 and the motor housing 11 , or between the first bearing 13 and the reduction gearbox housing 21 .

[0069] In this way, the setting of the insulating component 16 forms a short circuit between the first bearing 13 and the motor housing 11, or the first bearing 13 and the reduction gearbox housing 21, thereby isolating the shaft current on the motor shaft 12 from flowing through the first bearing 13, thereby avoiding electrical corrosion of the first bearing 13 and improving the service life of the first bearing 13.

[0070] Specifically, the insulating assembly 16 is a component for blocking the flow of current to provide electrical isolation.

[0071] The insulating component 16 can be fixed on the motor housing 11, the reduction gearbox housing 21 or the first bearing 13, or embedded as an independent component between the motor housing 11 and the first bearing 13, or embedded between the reduction gearbox housing 21 and the first bearing 13. The insulating component 16 can be made of various insulating materials, such as plastic, rubber, ceramic or other non-conductive materials.

[0072] Considering the use environment of the bearing, the insulating component 16 is easy to be worn. The insulating component 16 can also be formed by adding an insulating material coating on a metal material. For example, the insulating component 16 can include a steel sleeve 160 and a resin layer 161 arranged on the steel sleeve 160, the steel sleeve 160 is used to contact the first bearing 13, and the resin is used to contact the reduction box housing 21. A bearing chamber can be provided on the reduction box housing 21 or the rear cover of the motor. During assembly, the steel sleeve 160 can be first installed in the bearing chamber so that the resin layer 161 contacts the bottom surface of the bearing chamber, and then the first bearing 13 can be installed in the steel sleeve 160, and the first bearing 13 and the steel sleeve 160 are interference fit.

[0073] See also Figure 2 and Figure 6 In some embodiments, the reducer device 20 includes a second conductive structure 24, the first end 220 of the reducer input shaft 22 is conductively contacted with the motor shaft 12, the second end 221 of the reducer input shaft 22 is conductively contacted with the second conductive structure 24, the reducer housing 21 includes a front housing 210 and a rear housing 211 fixedly connected to the front housing 210, the front housing 210 is conductively contacted with the motor housing 11, the rear housing 211 is conductively contacted with the front housing 210, and the rear housing 211 is conductively contacted with the second conductive structure 24.

[0074] In this way, after the shaft current generated by the motor shaft 12 is transmitted to the reducer input shaft 22, the shaft current will flow to the rear housing 211 through the second conductive structure 24, and then flow to the front housing 210 and the motor housing 11. This reduces the shaft current flowing through the reducer device 20, thereby reducing the risk of electrical corrosion of the reducer device 20 and improving the service life of the reducer device 20.

[0075] Specifically, the second conductive structure 24 may be a structure provided on the reducer input shaft 22 or the rear housing 211, and the second conductive structure 24 may be made of a conductive material. The second conductive structure 24 may be a conductive ring, a brush, or other structures. In one embodiment, the second conductive structure 24 may be a bearing sleeved on the reducer input shaft 22, and a connector made of a conductive material may be provided in the bearing, and a first end of the connector may be in conductive contact with the reducer input shaft 22, and a second end of the connector may be in conductive contact with the rear housing 211.

[0076] The second conductive structure 24 is used to conduct the shaft current to the rear housing 211, thereby reducing the adverse effect of the shaft current on the reducer device 20 as a whole. The first end 220 of the reducer input shaft 22 refers to an end close to the motor shaft 12. The second end 221 of the reducer input shaft 22 refers to an end close to the rear housing 211.

[0077] The rear housing 211 may be the portion of the reducer away from the motor shaft 12 . The rear housing 211 and the front housing 210 may be connected together by bolting, welding, etc., and the shaft current may be transmitted between the front housing 210 and the rear housing 211 .

[0078] The reducer device 20 may further include a reducer gear assembly 25. The reducer gear assembly 25 is a core transmission component in the reducer device 20, and may include an input gear connected to the reducer input shaft 22 and a series of other gears fixed thereon. These gears transmit torque and speed through meshing, thereby reducing the speed and increasing the torque.

[0079] See also Figure 2 and Figure 7 In some embodiments, the second conductive structure 24 includes a conductive baffle 240, a spring 241 and a conductive pin 242. The spring 241 is used to make the first end 2420 of the conductive pin 242 abut against the conductive baffle 240. The first end 2420 of the conductive pin 242 can be conductively contacted with the conductive baffle 240, the second end 2421 of the conductive pin 242 can be conductively contacted with the spring 241, and the spring 241 can be conductively contacted with the rear box body 211.

[0080] Thus, the use of the spring 241 provides elastic support for the conductive pin 242 , so that the conductive pin 242 can maintain contact with the conductive baffle 240 , thereby reducing the probability of conductive contact failure caused by separation of the conductive pin 242 from the conductive baffle 240 .

[0081] Specifically, the conductive baffle 240 may be a plate-shaped structure made of conductive material, and the conductive baffle 240 may be fixed to the reducer input shaft 22 by a retaining spring. The spring 241 may be made of conductive material to allow current to pass through.

[0082] The conductive pin 242 may be a pin made of a conductive material. The conductive pin 242 may be in a regular shape, such as a prism, a cylinder, or an irregular shape. In one embodiment, the first end 2420 of the conductive pin 242 may be configured to be spherical, which may reduce friction loss between the conductive pin 242 and the conductive baffle 240.

[0083] See also Figure 7 In some embodiments, the rear box body 211 includes a main body 2110 and a protrusion 2111 protruding from the main body 2110, the protrusion 2111 is formed with a mounting groove 2112, the spring 241 is connected to the bottom wall 2113 of the mounting groove 2112, and the conductive pin 242 is spaced from the side wall 2114 of the mounting groove 2112.

[0084] Thus, the installation of the mounting groove 2112 helps to position the spring 241 and the conductive pin 242 during installation. In addition, the mounting groove 2112 provides physical protection for the spring 241 and the conductive pin 242, reducing the risk of damage caused by external shock or vibration.

[0085] In addition, since the conductive pin 242 is spaced from the side wall 2114 of the mounting groove 2112, the conductive pin 242 can move freely along the side wall 2114 of the mounting groove 2112. Even if the conductive pin 242 or the conductive baffle 240 is worn, the two can still maintain contact under the action of the spring 241, thereby reducing the probability of conductive contact failure between the conductive pin 242 and the conductive baffle 240.

[0086] Specifically, the main body 2110 is the main contour shape part of the rear box 211, and the main body 2110 can be used to provide a support function or set a mounting structure. The protrusion 2111 is a part protruding from the main body 2110 toward the reducer input shaft 22, and is used to form a mounting groove 2112.

[0087] The mounting groove 2112 may be a groove with the groove opening facing the reducer input shaft 22. The mounting groove 2112 may be in a regular shape such as a circle or a square, or may be in an irregular shape.

[0088] The spring 241 and the bottom wall 2113 of the mounting groove 2112 may be directly connected by welding, bonding, or the like, or indirectly connected by adding components such as a support ring and a support seat to the spring 241 .

[0089] See also Figure 8 The vehicle 1000 of the embodiment of the present application includes the electric drive system 100 of any of the above embodiments.

[0090] Since the vehicle 1000 includes the electric drive system 100 described above, it at least includes all the beneficial effects of the electric drive system 100, which will not be described in detail here.

[0091] In the description of this specification, the description with reference to the terms "one embodiment", "certain embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0092] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. An oil seal assembly, characterized in that: The oil seal assembly includes an annular body and a conductive structure, wherein the annular body is used to be sleeved on the motor shaft, the conductive structure is coated on the circumference of the annular body and is in conductive contact with the motor shaft, and the conductive structure is used to conduct the shaft current of the motor shaft to a grounded metal component.

2. The oil seal assembly according to claim 1, characterized in that: The conductive structure includes an annular conductor portion and a radial conductor portion fixed to the inner side of the annular conductor portion and conductively contactable, the annular conductor portion is wrapped around the circumference of the annular body, part of the radial conductor portion is embedded in the annular body, and part of the radial conductor portion extends out of the annular body to contact the motor shaft.

3. The oil seal assembly according to claim 2, characterized in that: The radial conductor portion includes a connecting portion and a conductive brush that can be conductively contacted with the connecting portion. One end of the connecting portion is connected to the annular conductor portion, and the other end extends toward the center of the annular body. The conductive brush is connected to one end of the connecting portion close to the motor shaft, and the conductive brush is used to be conductively contacted with the motor shaft.

4. The oil seal assembly according to claim 3, characterized in that: A positioning groove may be provided on the end surface of the connecting portion close to the motor shaft, and the conductive brush is fixed in the positioning groove by glue.

5. The oil seal assembly according to claim 2, characterized in that: The oil seal assembly further includes a skeleton, which is embedded in the annular body and used to support the annular body. The skeleton and the radial conductor portion at least partially overlap in the radial direction of the annular body.

6. The oil seal assembly according to claim 2, characterized in that: A first lip and a second lip are formed on one side of the annular body close to the motor shaft. The first lip and the second lip are arranged side by side in the axial direction of the motor shaft. The first lip and the second lip are both used for sealing contact with the circumferential surface of the motor shaft. A gap is set between the first lip and the second lip to form an isolation space. The part of the radial conductor part that contacts the motor shaft is located in the isolation space.

7. The oil seal assembly according to claim 1, characterized in that: The grounded metal component may be a motor housing or a reduction gearbox housing.

8. The oil seal assembly according to claim 3, characterized in that: The connecting portion and the annular conductor portion may form an L-shaped structure.

9. The oil seal assembly according to claim 3, characterized in that: The connecting portion and the annular conductor portion may be fixed together with the annular body through a vulcanization process.

10. A motor drive system, characterized in that: The motor drive system comprises a motor shaft and an oil seal assembly according to any one of claims 1-9.

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