Motor shaft conductive device, motor, electric assembly and vehicle

Abstract

The invention relates to a motor shaft conductive device, a motor, an electric assembly and a vehicle. The motor shaft conductive device comprises a first conductive piece and a second conductive piece, and the first conductive piece is arranged to be electrically connected with the motor shaft; the second conductive part comprises a carbon brush, one end of the carbon brush is electrically connected with the first conductive part, and the other end of the carbon brush is electrically connected with the shell. According to the motor shaft conductive device, the carbon brush is reused for conduction, and the effects of saving parts and improving the space utilization rate are achieved.

Description

Technical Field

[0001] The present application relates to the field of electronic technology, and in particular to a motor shaft conductive device, a motor, an electric assembly, and a vehicle. Background Art

[0002] Motor variable frequency technology, as an effective way to reduce energy consumption, is gaining recognition and widespread adoption. This technology uses pulse-width modulation (PWM) to control motor speed using AC power supplied by a variable frequency drive (VFD). The vector sum of the three-phase output voltage is non-zero, generating a common-mode voltage on the motor shaft through capacitive induction. This creates an electrical circuit between the motor shaft, housing, and bearings, generating shaft currents that can cause electrical discharge machining (EDM) pitting, electro-corrosion spots, and groove damage. All AC and DC motors driven by VFDs are susceptible to this fault, regardless of motor size or power. Electro-corrosion has become a leading cause of motor bearing failure, often difficult to detect early on. Gradually, motor vibration and noise increase, ultimately leading to unplanned downtime.

[0003] In the related art, in order to avoid the occurrence of electrical corrosion, a separate conductive device is set in the motor housing so that the current is transferred to the conductive device through the motor shaft and then transmitted out by the conductive device. However, the separately designed conductive device takes up a lot of space. Summary of the Invention

[0004] The present application provides a motor shaft conductive device, a motor, an electric assembly and a vehicle. The motor shaft conductive device provided in the present application reuses carbon brushes for conduction to at least partially solve the above-mentioned technical problems.

[0005] In order to achieve the above-mentioned object, according to a first aspect of the present application, a motor shaft conductive device is provided, comprising:

[0006] a first conductive member, the first conductive member being configured to be electrically connected to the motor shaft; and

[0007] The second conductive member includes a carbon brush, one end of the carbon brush is electrically connected to the first conductive member, and the other end of the carbon brush is configured to be electrically connected to the housing.

[0008] Optionally, the first conductive member is configured to be installed in a shaft hole of the motor shaft.

[0009] Optionally, a sealing member is further included, wherein the sealing member is connected to the second conductive member, and the sealing member is configured to seal the second conductive member and the motor shaft.

[0010] Optionally, the first conductive member is configured to be sealed and connected to the motor shaft.

[0011] Optionally, the sealing member is spaced apart from the first conductive member, and a receiving space for receiving carbon powder of the carbon brush is formed between the first conductive member and the sealing member.

[0012] Optionally, the first conductive member and the second conductive member are coaxially arranged.

[0013] Optionally, a receiving groove is provided on a side of the first conductive member close to the second conductive member, and the second conductive member abuts against the bottom of the receiving groove.

[0014] Optionally, a protrusion is provided at the bottom of the receiving groove, and the protrusion abuts against the second conductive member.

[0015] Optionally, a fixing bracket is further included, wherein the fixing bracket is rotatably connected to the second conductive member, and the fixing bracket is configured to be fixedly connected to the shell.

[0016] Optionally, the fixed bracket includes a first frame and a second frame, the first frame is sleeved on the second frame, the first frame is threadedly connected to the second frame, the second frame is sleeved on the second conductive member, and the end of the second conductive member facing away from the first conductive member abuts against the second frame.

[0017] Optionally, the second conductive member includes a sleeve, and the fixing bracket is sleeved on the sleeve;

[0018] The carbon brush is installed in the sleeve, one end of the carbon brush close to the first conductive member extends out of the sleeve and is connected to the first conductive member, and the other end is configured to be connected to the housing.

[0019] Optionally, the second conductive member further includes an elastic member, one end of the elastic member abuts against the carbon brush, and the other end of the elastic member abuts against the fixing bracket;

[0020] Wherein, one end of the carbon brush facing away from the elastic member abuts against the first conductive member.

[0021] Optionally, the second conductive member further includes a connecting wire, one end of the connecting wire passes through the elastic member and is connected to the fixing bracket, and the other end of the connecting wire is connected to the carbon brush.

[0022] According to a third aspect of the present application, there is further provided a motor, comprising:

[0023] case;

[0024] The motor shaft is rotatably mounted in the housing.

[0025] The above-mentioned motor shaft conductive device is used to connect the motor shaft and the housing.

[0026] Optionally, the outer side wall of the first conductive member fits into the inner wall of the shaft hole of the motor shaft.

[0027] Optionally, a first supporting boss and a second supporting boss arranged along the axial direction are formed in the hole shaft of the motor shaft, the first supporting boss is used to support the first conductive part of the motor shaft conductive device, and the second supporting boss is used to support the sealing part of the motor shaft conductive device.

[0028] According to a third aspect of the present application, an electric assembly system is also provided, comprising the above-mentioned motor.

[0029] According to a fourth aspect of the present application, a vehicle is also provided, comprising the above-mentioned electric assembly system.

[0030] Beneficial effects of this application:

[0031] In the technical solution of this application, a first conductive member is connected to the motor shaft, and a second conductive member includes a carbon brush, one end of which is connected to the first conductive member and the other end is configured to be connected to the housing. During operation, the current generated on the motor shaft is transmitted to the first conductive member, which in turn transmits the current to the carbon brush, which in turn transmits the current to the housing. This prevents the current from stagnating on the motor shaft and causing electrical corrosion to the bearings. By reusing the carbon brush as a conductive member, this application achieves the effect of saving parts and improving space utilization.

[0032] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0034] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same drawing numbers represent the same parts in the following description.

[0035] Figure 1 This is a schematic structural diagram of a portion of the structure of an embodiment of a motor provided by the present application;

[0036] Figure 2 This is a structural diagram of an embodiment of the motor shaft conductive device provided by the present application;

[0037] Figure 3 yes Figure 2Explosion diagram of the conductive device of the motor shaft;

[0038] Figure 4 yes Figure 2 A cross-sectional view of the conductive device of the motor shaft;

[0039] Figure 5 yes Figure 2 A schematic structural diagram of the first conductive member;

[0040] Figure 6 yes Figure 5 A cross-sectional view of an embodiment of the first conductive member;

[0041] Figure 7 yes Figure 5 A cross-sectional view of another embodiment of the first conductive member.

[0042] Description of reference numerals:

[0043] 1000, motor;

[0044] 100, motor shaft conductive device; 110, first conductive member; 111, receiving groove; 112, raised portion; 113, recessed portion; 120, second conductive member; 121, carbon brush; 122, sleeve; 123, elastic member; 124, connecting wire; 130, sealing member; 131, receiving space; 140, fixing bracket; 141, first frame; 142, second frame;

[0045] 200, housing;

[0046] 300, motor shaft; 310, first supporting boss; 320, second supporting boss;

[0047] 400. Bearings. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0049] Motor frequency conversion technology, as an effective way to reduce energy consumption, is gaining recognition and widespread adoption. Frequency conversion technology uses pulse-width modulation (PWM) to control motor speed using AC power supplied by a variable frequency drive (VFD). The vector sum of the three-phase output voltage is non-zero, which in turn generates a common-mode voltage on the motor shaft through capacitive induction. This creates an electrical circuit between the motor shaft, housing, and bearings 400, generating shaft currents that can cause damage from electrical discharge machining (EDM) pitting, electro-corrosion spots, and grooves. This fault is common in the bearings 400 of all AC and DC motors driven by VFDs, regardless of motor size or power. Electro-corrosion has become a major cause of motor bearing failure, often difficult to detect early on. Gradually, motor vibration and noise increase, ultimately leading to unexpected downtime. To prevent electro-corrosion, conventional conductive devices are installed within the motor housing. Current is transferred to the conductive device through the motor shaft and then outwardly transmitted by the conductive device. However, these separately designed conductive devices occupy a significant amount of space.

[0050] In view of this, the present application proposes a motor 1000, Figures 1 to 7 This is a structural schematic diagram of an embodiment of the motor 1000 provided in the present application. The motor 1000 provided in the present application conducts the current generated on the motor shaft 300 through the motor shaft conductive device 100 to avoid electrical corrosion of the bearings 400 in the motor 1000. The motor 1000 provided in the present application will be described in detail below in conjunction with the main drawings.

[0051] See also Figure 1 The present application provides a motor 1000, which includes a motor shaft 300, a housing 200, and a motor shaft conductive device 100. The motor shaft 300 is rotatably mounted within the housing 200, and the motor shaft conductive device 100 is used to connect the motor shaft 300 and the housing 200. The specific structure and connection method of the motor shaft 300 and the housing 200 can be referred to conventional arrangements in the art and will not be detailed here.

[0052] This application also provides a motor shaft conductive device 100, see Figure 1 、 Figure 2 and Figure 3 The motor shaft conductive device 100 includes a first conductive member 110 and a second conductive member 120; the first conductive member 110 is configured to be electrically connected to the motor shaft 300, and the second conductive member 120 includes a carbon brush 121, one end of the carbon brush 121 is electrically connected to the first conductive member 110, and the other end of the carbon brush 121 is configured to be electrically connected to the housing 200.

[0053] In the technical solution of the present application, a first conductive member 110 is connected to the motor shaft 300, and a second conductive member 120 includes a carbon brush 121. One end of the carbon brush 121 is connected to the first conductive member 110, and the other end is configured to be connected to the housing 200. During operation, the current generated on the motor shaft 300 is transmitted to the first conductive member 110, which in turn transmits the current to the carbon brush 121. The carbon brush 121 then transmits the current to the housing 200, thereby preventing the current from lingering on the motor shaft 300 and causing electrical corrosion to the bearing 400. By reusing the carbon brush 121 as a conductive member, the present application saves parts and improves space utilization.

[0054] In some embodiments, please refer to Figure 1 The first conductive member 110 is configured to be installed in the shaft hole of the motor shaft 300, rationally utilizing the space in the motor shaft 300, improving the structural compactness of the motor shaft conductive device 100, and saving space.

[0055] In this embodiment, the housing 200 is generally a fixed device, fixed to the ground or a certain device, and the motor shaft 300 is a rotating part, because the second conductive part 120 needs to meet the characteristics of contact sliding. Specifically, the second conductive part 120 includes a carbon brush 121. The carbon brush 121 serves as a sliding contact part, which can electrically connect the housing 200 and the motor shaft 300 without affecting the rotation of the motor shaft 300. More specifically, one end of the carbon brush 121 is connected to the first conductive part 110, and the other end of the carbon brush 121 is configured to be connected to the housing 200. During actual operation, when the motor shaft 300 transmits current to the first conductive part 110, the first conductive part 110 transmits current to the carbon brush 121, and the carbon brush 121 then transmits current to the housing 200, thereby realizing current transmission and preventing the current from staying on the motor shaft 300 and causing electrical corrosion to the bearing 400.

[0056] In some embodiments, see Figure 1 、 Figure 2 and Figure 3 The motor shaft conductive device 100 further includes a sealing member 130. To ensure the normal operation of the motor 1000, a cooling device is often provided inside the motor 1000 to cool the motor 1000 and prevent the motor 1000 from overheating. The motor 1000 is often cooled by oil cooling. During the cooling process, if cooling oil enters the motor shaft conductive device 100, the cooling oil will form an insulating protective film on the surface of the second conductive member 120, causing the second conductive member 120 to be unable to perform its conductive function. In this embodiment, a sealing member 130 is provided inside the motor shaft 300 to seal the motor shaft conductive device 100, thereby preventing cooling oil from entering the motor shaft conductive device 100.

[0057] In other embodiments, to improve structural compactness, the first conductive member 110 is configured to be sealed with the motor shaft 300. In this embodiment, the first conductive member 110 not only serves as a conductor, transmitting current on the motor shaft 300, but also as a seal, preventing the cooling oil in the motor 1000 from entering and forming an insulating oil film on the surface of the carbon brush 121, thereby preventing current transmission and causing electrical corrosion to the bearing 400.

[0058] In some embodiments, in order to simplify the installation steps and improve the compactness of the structure, the motor shaft conductive device 100 is only provided with a first conductive member 110, and no sealing member 130 is provided. The first conductive member 110 is configured to be sealed and connected to the motor shaft 300. The first conductive member 110 serves as a conductive function and is used to transmit current on the motor shaft 300. It also serves as a sealing function and is used to seal the motor shaft 300 to prevent the cooling oil in the motor 1000 from entering.

[0059] It should be noted that the carbon brush 121 is in sliding contact with the first conductive member 110. During the operation of the motor 1000, the carbon brush 121 and the first conductive member 110 are in constant frictional contact. During this frictional contact, the carbon brush 121 generates carbon powder due to friction. This carbon powder can enter the interior of the motor 1000 and cause damage to the motor 1000. To prevent this, the motor shaft conductive device 100 is further provided with a seal 130. The seal 130 is connected to the second conductive member 120 and is configured to seal the connection between the second conductive member 120 and the motor shaft 300. The seal 130 prevents the carbon powder generated by the carbon brush 121 from entering the interior of the motor 1000, thereby protecting the motor 1000.

[0060] In some embodiments, see Figure 1 The seal 130 is spaced apart from the first conductive member 110 , and a receiving space 131 for accommodating carbon powder from the carbon brush 121 is formed between the first conductive member 110 and the seal 130 . During the operation of the motor 1000 , the carbon brush 121 is in constant frictional contact with the first conductive member 110 . During this frictional contact, the carbon brush 121 generates carbon powder due to friction. The receiving space 131 can collect and seal the carbon powder particles worn between the carbon brush 121 and the first conductive member 110 , thereby preventing the worn carbon powder from entering the motor 1000 and adversely affecting the insulation system of the motor 1000 and components such as the bearing 400 .

[0061] In this example, please continue to refer to Figure 1The seal 130 is connected to the second conductive member 120, and the seal 130 is configured to seal the second conductive member 120 and the motor shaft 300. The first conductive member 110 is configured to seal the motor shaft 300. A receiving space 131 for receiving carbon powder of the carbon brush 121 is formed between the first conductive member 110 and the seal 130. In this way, carbon powder can be prevented from entering the interior of the motor 1000, and cooling oil can be prevented from entering the motor shaft conductive device 100, thereby improving the working efficiency of the motor 1000.

[0062] In some embodiments, see Figure 4 To improve space utilization, the first conductive member 110 and the second conductive member 120 are coaxially arranged. Furthermore, the carbon brush 121 is coaxially arranged with the first conductive member 110, and the carbon brush 121 abuts the center of the first conductive member 110. This position minimizes wear of the carbon brush 121 and generates the least carbon powder.

[0063] See also Figure 5 In some embodiments, in order to prevent the carbon powder generated by the carbon brush 121 from entering the motor 1000, a receiving groove is provided on the side of the first conductive member 110 close to the second conductive member 120. The receiving groove can accommodate the carbon powder. When the carbon brush 121 is severely worn, the first conductive member 110 can be removed and the carbon powder in the receiving groove can be poured out, thereby preventing the carbon powder from entering the motor 1000 and causing adverse effects on the insulation system of the motor 1000 and components such as the bearing 400. Furthermore, the second conductive member 120 can abut against the groove wall of the receiving groove 111, and the second conductive member 120 can also abut against the groove bottom of the receiving groove. As a preferred embodiment, the second conductive member 120 abuts against the groove bottom of the receiving groove. Such an arrangement can increase the contact area between the second conductive member 120 and the first conductive member 110, and better transfer the current on the motor shaft 300 to the housing 200.

[0064] In some embodiments, to ensure connection strength, the first conductive member 110 and the motor shaft 300 are interference fit, and the sealing member 130 and the motor shaft 300 are interference fit.

[0065] See also Figure 6 In some embodiments, a protrusion 112 is provided at the bottom of the receiving groove, and the protrusion 112 abuts against the second conductive member 120. The purpose of providing the protrusion 112 is to increase the contact area between the carbon brush 121 and the first conductive member 110. During actual operation, the end of the carbon brush 121 close to the first conductive member 110 will be deformed by force and wrapped around the protrusion 112, thereby increasing the contact area between the carbon brush 121 and the first conductive member 110. Figure 7In some other embodiments, a groove portion is provided at the bottom of the receiving groove, and the second conductive member 120 abuts against the groove portion. Specifically, one end of the carbon brush 121 close to the first conductive member 110 is clamped in the groove portion, thereby increasing the contact area between the carbon brush 121 and the first conductive member 110.

[0066] It should be noted that the second conductive member 120 is connected to the motor shaft 300 and rotates with the motor shaft 300. Therefore, if the second conductive member 120 is directly connected to the housing 200, friction will be generated between the second conductive member 120 and the housing 200 during the rotation of the second conductive member 120, resulting in damage to the housing 200 or the second conductive member 120. In order to avoid the above situation, in some embodiments, please refer to Figure 1 and Figure 4 The motor shaft conductive device 100 further includes a fixing bracket 140, which is used to connect the second conductive member 120 to the housing 200. Specifically, the fixing bracket 140 is rotatably connected to the second conductive member 120 and is configured to be fixedly connected to the housing 200. During actual operation, when the motor shaft 300 transmits current to the first conductive member 110, the first conductive member 110 transmits the current to the second conductive member 120, and the second conductive member 120 transmits the current to the fixing bracket 140. The fixing bracket 140 is connected to the housing 200 and then transmits the current to the housing 200, thereby achieving current transmission and preventing the current from staying on the motor shaft 300 and causing electrical corrosion to the bearing 400.

[0067] It should be noted that the specific type of the fixing bracket 140 is not limited. The fixing bracket 140 includes a first frame 141 and a second frame 142. The first frame 141 is sleeved onto the second frame 142, and the first frame 141 and the second frame 142 are threadedly connected. The second frame 142 is sleeved onto the second conductive member 120, and the end of the second conductive member 120 facing away from the first conductive member 110 is connected to the second frame 142. In this embodiment, the housing 200 is formed with a first mounting cavity, and the first frame 141 is mounted in the first mounting cavity. The first frame 141 and the first mounting cavity have an interference fit, or the first frame 141 and the housing 200 are fixed by bolts. The first frame 141 has a first through hole formed therein, and the first through hole has an internal thread. The second frame 142 has an external thread on its outer side, and the internal thread mates with the external thread to fix the second frame 142 to the first frame 141. A second mounting cavity is formed in the second frame 142 , and the second conductive member 120 is disposed in the second mounting cavity. The second conductive member 120 cooperates with the second frame 142 so that the second conductive member 120 can rotate in the second mounting cavity.

[0068] For more details, please refer to Figure 1 and Figure 4When the motor shaft 300 transmits current to the first conductive member 110, the first conductive member 110 transmits current to the second conductive member 120, the second conductive member 120 transmits current to the second bracket, the second bracket transmits current to the first bracket, and the first bracket transmits current to the housing 200, thereby realizing current transmission and preventing current from staying on the motor shaft 300 and causing electrical corrosion to the bearing 400.

[0069] See also Figure 4 In some embodiments, the second conductive member 120 further includes a sleeve 122, and the fixing bracket 140 is sleeved on the sleeve 122. More specifically, the carbon brush 121 is mounted within the sleeve 122. One end of the carbon brush 121, which is closest to the first conductive member 110, extends out of the sleeve 122 and abuts against the first conductive member 110. The other end is connected to the housing 200. Specifically, the mounting cavity within the second bracket is cylindrical, and the outer side of the sleeve 122 is also cylindrical, which facilitates the installation of the sleeve 122 within the second bracket.

[0070] In some embodiments, see Figure 1 and Figure 4 The second conductive member 120 further includes an elastic member 123. One end of the elastic member 123 abuts the carbon brush 121, and the other end of the elastic member 123 abuts the fixing bracket 140. The end of the carbon brush 121 facing away from the elastic member 123 abuts the first conductive member 110. Specifically, during installation, the elastic member 123 is installed in a compressed state within the second installation cavity. The carbon brush 121 is then installed within the second installation cavity. The elastic member 123 rebounds and pushes against the carbon brush 121, causing the carbon brush 121 to tightly abut against the first conductive member 110. Since the carbon brush 121 and the first conductive member 110 are in sliding contact, the elastic member 123 exerts a certain axial force on the carbon brush 121, ensuring good contact between the carbon brush 121 and the first conductive member 110, thereby achieving a better conductive effect.

[0071] More specifically, when the first conductive member 110 is provided with a protrusion 112 on the side facing the carbon brush 121, the elastic member 123 applies a certain axial force to the carbon brush 121, causing the side of the carbon brush 121 close to the protrusion 112 to deform, thereby tightly wrapping the protrusion 112, so that the carbon brush 121 is in good contact with the first conductive member 110, thereby achieving a better conductive effect.

[0072] The specific type of the elastic member 123 is not limited, as long as it can provide a certain axial force to the carbon brush 121 so that the carbon brush 121 has good contact with the first conductive member 110. Specifically, in some embodiments, the elastic member 123 is a spring.

[0073] In some embodiments, in order to ensure the connection strength and prevent the carbon brush 121 from being separated from the sleeve 122, please continue to refer to Figure 4The second conductive member 120 further includes a connecting wire 124 , one end of the connecting wire 124 passes through the elastic member 123 and is connected to the fixing bracket 140 , and the other end of the connecting wire 124 is connected to the carbon brush 121 .

[0074] More specifically, the shape of the carbon brush 121 is mostly rectangular. To facilitate the installation of the carbon brush 121 , the shape of the space inside the sleeve 122 is rectangular.

[0075] The motor shaft conductive device 100 provided in the present application is easy to install and can largely utilize the space inside the motor shaft 300 without occupying additional space in the motor 1000. At the same time, a receiving space 131 is formed between the first conductive member 110, the sealing member 130 and the motor shaft 300. The receiving space 131 can collect the carbon powder generated by the carbon brush 121 to prevent the carbon powder from entering other spaces in the motor 1000 and causing adverse effects on the motor 1000. At the same time, the first conductive member 110 can achieve both conductive and sealing functions, preventing the cooling oil in the motor 1000 from entering the motor shaft conductive device 100, allowing the carbon brush 121 to operate in an oil-free environment, thereby achieving better conductive effects. The carbon brush 121 and the first conductive member 110 are in axial contact, which can reduce the wear of the carbon brush 121 and is beneficial to the maintenance of the motor 1000.

[0076] Furthermore, during actual installation, the provision of elastic member 123 can reduce the length of carbon brush 121, thereby reducing the axial space required for motor shaft conductive device 100 and improving space utilization. The length of carbon brush 121 can be selected based on actual conditions. In some embodiments, the length of carbon brush 121 is 17 mm.

[0077] The working principle of the motor shaft conductive device 100 provided in the present application is as follows: during the operation of the motor 1000, a certain current will be generated on the motor shaft 300, the first conductive part 110 contacts the motor shaft 300, and the current is transmitted to the first conductive part 110, and the first conductive part 110 then transmits the current to the carbon brush 121, the carbon brush 121 transmits the current to the spring, the spring transmits the current to the second bracket, the second bracket transmits the current to the first bracket, the first bracket is connected to the shell 200, and transmits the current to the shell 200, the shell 200 is grounded, and transmits the current to the bottom surface, thereby transmitting the current out to prevent the current from staying on the motor shaft 300 and causing electrical corrosion to the bearing 400.

[0078] In some embodiments, the motor 1000 further includes a cable, one end of the cable is connected to the housing 200 of the motor 1000 , and the other end of the cable is connected to the ground, thereby transferring the current on the housing 200 to the ground.

[0079] It should be noted that the connection method between the first conductive member 110 and the motor shaft 300 is not limited, as long as the outer wall of the first conductive member 110 can contact the inner wall of the shaft hole of the motor shaft 300 to achieve the conductive function.

[0080] For example, in some embodiments, the first conductive member 110 is interference fit with the motor shaft 300 , the first conductive member 110 is directly snapped into the motor shaft 300 , and the first conductive member 110 is in close contact with the inner wall of the motor shaft 300 .

[0081] In some other embodiments, please refer to Figure 1 A first supporting boss 310 and a second supporting boss 320 are formed in the motor shaft 300 along its axial direction. The first supporting boss 310 is used to support the first conductive member 110 of the motor shaft conductive device 100, and the second supporting boss 320 is used to support the seal 130 of the motor shaft conductive device 100. This arrangement facilitates the installation of the first conductive member 110 and the seal 130, eliminates the need for additional bearings, simplifies the motor structure, and reduces costs.

[0082] According to a third aspect of the present application, an electric powertrain system is provided, which includes the aforementioned motor 1000. The electric powertrain system has all the advantages of the aforementioned motor 1000, which will not be further elaborated herein.

[0083] According to a fourth aspect of the present application, a vehicle is provided, which includes the above-mentioned electric assembly system. The vehicle has all the beneficial effects of the above-mentioned electric assembly system, which will not be described in detail in this application.

[0084] The vehicle may be a fuel vehicle, a plug-in hybrid vehicle or a new energy vehicle, etc., and this application does not make any specific restrictions on this.

[0085] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0086] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0087] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0088] The above are merely preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A motor shaft conductive device, characterized in that: include: a first conductive member, the first conductive member being configured to be electrically connected to the motor shaft; as well as, The second conductive member includes a carbon brush, one end of the carbon brush is electrically connected to the first conductive member, and the other end of the carbon brush is configured to be electrically connected to the housing.

2. The motor shaft conductive device according to claim 1, characterized in that: The first conductive member is configured to be installed in the shaft hole of the motor shaft.

3. The motor shaft conductive device according to claim 2, characterized in that: The invention also includes a sealing member, which is connected to the second conductive member and is configured to seal the second conductive member and the motor shaft.

4. The motor shaft conductive device according to claim 3, characterized in that: The first conductive member is configured to be sealed and connected to the motor shaft.

5. The motor shaft conductive device according to claim 4, characterized in that: The sealing member is spaced apart from the first conductive member, and a receiving space for receiving carbon powder of the carbon brush is formed between the first conductive member and the sealing member.

6. The motor shaft conductive device according to claim 1, characterized in that: The first conductive member and the second conductive member are coaxially arranged.

7. The motor shaft conductive device according to claim 1, characterized in that: A receiving groove is provided on a side of the first conductive member close to the second conductive member, and the second conductive member abuts against the bottom of the receiving groove.

8. The motor shaft conductive device according to claim 7, characterized in that: A protrusion is provided at the bottom of the receiving groove, and the protrusion abuts against the second conductive member.

9. The motor shaft conductive device according to claim 2, characterized in that: It also includes a fixing bracket, which is rotatably connected to the second conductive member and is configured to be fixedly connected to the shell.

10. The motor shaft conductive device according to claim 9, characterized in that: The fixed bracket includes a first frame and a second frame, the first frame is sleeved on the second frame, the first frame and the second frame are threadedly connected, the second frame is sleeved on the second conductive member, and the end of the second conductive member facing away from the first conductive member abuts against the second frame.

11. The motor shaft conductive device according to claim 9, characterized in that: The second conductive member includes a sleeve, and the fixing bracket is sleeved on the sleeve; The carbon brush is installed in the sleeve, one end of the carbon brush close to the first conductive member extends out of the sleeve and is connected to the first conductive member, and the other end is configured to be connected to the housing.

12. The motor shaft conductive device according to claim 11, characterized in that: The second conductive member further includes an elastic member, one end of the elastic member abuts against the carbon brush, and the other end of the elastic member abuts against the fixing bracket; Wherein, one end of the carbon brush facing away from the elastic member abuts against the first conductive member.

13. The motor shaft conductive device according to claim 12, characterized in that: The second conductive member further includes a connecting wire, one end of the connecting wire passes through the elastic member and is connected to the fixing bracket, and the other end of the connecting wire is connected to the carbon brush.

14. A motor, characterized in that: include: case; The motor shaft is rotatably mounted in the housing. The motor shaft conductive device according to any one of claims 1 to 13, wherein the motor shaft conductive device is used to connect the motor shaft and the housing.

15. The motor according to claim 14, characterized in that The outer wall of the first conductive member is in contact with the inner wall of the shaft hole of the motor shaft.

16. The motor according to claim 15, characterized in that A first supporting boss and a second supporting boss are formed in the hole shaft of the motor shaft along its axial direction. The first supporting boss is used to support the first conductive part of the motor shaft conductive device, and the second supporting boss is used to support the sealing part of the motor shaft conductive device.

17. An electric assembly, characterized in that: The motor comprises the motor according to any one of claims 14 to 16.

18. A vehicle, characterized in that: Comprising the electric powertrain assembly as claimed in claim 17.

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