Electric drive device, power assembly and vehicle

Abstract

The invention discloses an electric driving device which comprises a shell, a first shaft, a second shaft and a conducting ring, the first shaft is rotatably supported on the shell, the second shaft is in coaxial transmission connection with the first shaft and rotatably supported on the shell, and the conducting ring is arranged on the shell and comprises a first electric contact part and a second electric contact part. The first electrical contact is in electrical contact with the first shaft, and the second electrical contact is in electrical contact with the second shaft. By arranging the conducting ring, shaft current in the electric drive device is led out through two paths, the leading-out efficiency of the shaft current in the electric drive device is improved, and the anti-electrocorrosion effect of parts such as a bearing and a gear in the electric drive device is enhanced.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to the field of electric drive technology. Background Art

[0002] An electric drive device is usually composed of a motor and a transmission. During the operation of the motor, the shaft current generated on the motor shaft will cause electrical corrosion to the bearings and gears on the transmission shaft inside the electric drive device, thus affecting the life of the device. The electric drive device of the related art has poor anti-electrical corrosion effect. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide an electric drive device that can effectively protect components such as bearings and gears in the electric drive device from shaft current corrosion.

[0004] The present invention provides an electric drive device, comprising a shell, a first shaft, a second shaft and a conductive ring, wherein the first shaft is rotatably supported on the shell, the second shaft is coaxially connected to the first shaft and rotatably supported on the shell, and the conductive ring is arranged on the shell and comprises a first electrical contact portion and a second electrical contact portion, the first electrical contact portion is in electrical contact with the first shaft, and the second electrical contact portion is in electrical contact with the second shaft.

[0005] According to the electric drive device of the present invention, a first electrical contact portion is arranged on the conductive ring, and the first electrical contact portion is in electrical contact with the first shaft to form a first shaft current extraction path between the first shaft and the housing; a second electrical contact portion is arranged on the conductive ring, and the second electrical contact portion is in electrical contact with the second shaft to form a second shaft current extraction path between the second shaft and the housing; by providing a conductive ring, the shaft current in the electric drive device can be extracted through two paths, thereby improving the extraction efficiency of the shaft current in the electric drive device and enhancing the anti-electrical corrosion effect of parts such as bearings and gears in the electric drive device. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0007] Figure 1 is a schematic diagram of an electric drive device according to an embodiment of the present invention;

[0008] Figure 2 yes Figure 1 One of the partial enlarged images of point A in the middle;

[0009] Figure 3 yes Figure 1 The second partial enlarged image of the A in the middle;

[0010] Figure 4 This is one of the partial structural schematic diagrams of the electric drive device according to an embodiment of the present invention;

[0011] Figure 5 This is the second schematic diagram of the partial structure of the electric drive device according to the embodiment of the present invention;

[0012] Figure 6 This is the third schematic diagram of the structure of the electric drive device according to the embodiment of the present invention;

[0013] Figure 7 This is a fourth schematic diagram of a partial structure of an electric drive device according to an embodiment of the present invention;

[0014] Figure 8 This is the fifth schematic diagram of the structure of the electric drive device according to the embodiment of the present invention;

[0015] Fig. 9 This is the sixth schematic diagram of the structure of the electric drive device according to the embodiment of the present invention;

[0016] Fig.10 This is the seventh schematic diagram of the structure of the electric drive device according to the embodiment of the present invention;

[0017] Fig.11 is a schematic diagram of the appearance of a conductive ring according to an embodiment of the present invention;

[0018] Fig.12 is a schematic front view of a conductive ring according to an embodiment of the present invention;

[0019] Fig.13 is a schematic side cross-sectional view of a conductive ring according to an embodiment of the present invention;

[0020] Fig.14 is a schematic front view of a first conductive brush according to an embodiment of the present invention;

[0021] Fig.15 is a schematic side cross-sectional view of a first conductive brush according to an embodiment of the present invention.

[0022] Reference numerals:

[0023] 100-conductive ring, 110-first electrical contact portion, 120-second electrical contact portion, 130-conductive ring body, 131-first sealing portion, 1311-first sealing body, 1312-first sealing lip, 132-second sealing portion, 1321-second sealing body, 1322-second sealing lip, 133-third sealing portion, 1331-third sealing body, 1332-third sealing lip, 134-fourth sealing portion, 135-fifth sealing portion, 136-sixth sealing portion, 137-first oil passage, 1371-oil inlet, 1372-first oil outlet, 1373-second oil outlet, 140-first conductive brush, 141-conductive brush base, 142-conductive brush bristles, 143-elastic pin, 150-second conductive brush, S1-first sealing space, S2-second sealing space, S3-third sealing space,

[0024] 200-housing, 210-lubricating oil passage,

[0025] 300-first axis,

[0026] 400 - Second axis,

[0027] 500-first bearing,

[0028] 600-Second bearing. DETAILED DESCRIPTION

[0029] Embodiments of the present invention are described in detail below, examples of which 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 invention, and cannot be understood as limiting the present invention.

[0030] In the description of the present invention, 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", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0031] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0032] In the description of the present invention, "plurality" means two or more than two, and "several" means one or more.

[0033] The present invention proposes an electric drive device, including a shell 200, a first shaft 300, a second shaft 400 and a conductive ring 100, wherein the first shaft 300 is rotatably supported on the shell 200, the second shaft 400 is coaxially connected to the first shaft 300 and is rotatably supported on the shell 200, and the conductive ring 100 is arranged on the shell 200 and includes a first electrical contact portion 110 and a second electrical contact portion 120, the first electrical contact portion 110 is in electrical contact with the first shaft 300, and the second electrical contact portion 120 is in electrical contact with the second shaft 400.

[0034] The present invention provides a first electrical contact portion 110 on a conductive ring 100, and the first electrical contact portion 110 is in electrical contact with the first shaft 300 to form a first shaft current extraction path between the first shaft 300 and the housing 200. A second electrical contact portion 120 is provided on the conductive ring 100, and the second electrical contact portion 120 is in electrical contact with the second shaft 400 to form a second shaft current extraction path between the second shaft 400 and the housing 200. By providing a conductive ring 100, the shaft current in the electric drive device can be extracted through two paths, thereby improving the extraction efficiency of the shaft current in the electric drive device and enhancing the anti-electrocorrosion effect of parts such as bearings and gears in the electric drive device.

[0035] The electric drive device usually includes a motor and a transmission. During the operation of the motor, the shaft current generated on the motor shaft will cause electrical corrosion to the bearings, gears, etc. on the motor shaft and other transmission shafts connected thereto, thus affecting the life of the electric drive device. Some related technologies set a conductive ring 100 between the motor shaft and the housing 200, which largely avoids the motor bearings from being harmed by electrical corrosion, but part of the shaft current is still transmitted to the transmission, which will cause electrical corrosion to parts such as bearings and gears on the transmission. The conductive ring 100 of the present invention simultaneously forms two conductive paths between the motor shaft and the housing 200 and between the transmission shaft and the housing 200, which simultaneously conducts the shaft current on the motor shaft and the shaft current on the transmission shaft, thereby effectively protecting the parts in the electric drive device from electrical corrosion.

[0036] The first shaft 300 and the second shaft 400 coaxially arranged and transmission-connected in the electric drive device are usually the motor shaft and the transmission input shaft. The first shaft current extraction path extracts most of the shaft current on the source of the shaft current - the motor shaft, and the remaining small amount of shaft current on the motor shaft will be introduced into the transmission input shaft coaxially connected thereto. The second shaft current extraction path further extracts this part of the shaft current, effectively preventing the shaft current from forming a conductive path between the bearing and the housing 200 or the gear pair and the housing 200, causing electrical corrosion to components such as the bearing and the gear pair.

[0037] like Figure 1In the embodiment shown, the housing 200 is provided with a mounting hole for the conductive ring 100, and the conductive ring 100 can be press-fitted in the mounting hole by interference fit. The conductive ring 100 is also sleeved on the first shaft 300, and the first electrical contact portion 110 is located radially inward of the conductive ring 100 and contacts the outer peripheral surface of the first shaft 300, so as to form a conductive path between the first shaft 300 and the housing 200. The second shaft 400 is located on one side of the axial direction of the conductive ring 100, and a second electrical contact portion 120 is provided between the second shaft 400 and the conductive ring 100, so as to form a conductive path between the second shaft 400 and the housing 200. Specifically, the flow path of the current on the first shaft 300 is: first shaft 300 → first electrical contact portion 110 (conductive ring 100) → housing 200, and the flow path of the current on the second shaft 400 is: second shaft 400 → second electrical contact portion 120 (conductive ring 100) → housing 200.

[0038] It can be understood that the first shaft 300 and the second shaft 400 are supported in the housing 200 through bearings. Since there is usually a lubricating oil film between the inner and outer rings of the bearings and between the gear pairs, the resistivity of the current breaking through the oil film is higher, that is, the resistivity of the above two current flow paths is lower than that of the current flowing from the first shaft 300 and / or the second shaft 400 through the bearings or gear pairs to the housing 200. Therefore, the above two conductive paths can provide short-circuit protection for the bearings and gear pairs.

[0039] It can also be understood that the conductive ring 100 and the housing 200 are made of conductive materials, such as metal. Metal is a good conductor of electricity and is also a carrier and protector of mechanical devices with good mechanical properties.

[0040] In some embodiments, the first shaft 300 is a motor shaft, and the second shaft 400 is a transmission shaft, specifically, an input shaft of the transmission.

[0041] In other embodiments, the first shaft 300 is a transmission shaft, and the second shaft 400 is a motor shaft.

[0042] The conductive ring 100 is arranged between the motor shaft and the transmission input shaft and the housing 200. Since the shaft current is generated on the motor shaft and the transmission input shaft is a shaft directly connected to the motor shaft, such an arrangement can extract the shaft current from the source of the shaft current in the electric drive device, further enhancing the anti-electrocorrosion effect of the parts in the electric drive device.

[0043] In some embodiments of the present invention, the conductive ring 100 further includes a conductive ring body 130 , which is sleeved on the first shaft 300 , and the first electrical contact portion 110 is located between the conductive ring body 130 and the first shaft 300 , and the first electrical contact portion 110 is in electrical contact with the outer circumference of the first shaft 300 .

[0044] Since the first shaft 300 and the shell 200 rotate relative to each other, the conductive ring 100 includes a conductive ring body 130 and a first electrical contact portion 110, which is beneficial for the two parts of the conductive ring 100 to contact the rotating first shaft 300 and the stationary shell 200 respectively, and is also beneficial for setting the materials and / or structures of the two parts of the conductive ring 100 to be different, so as to facilitate the first electrical contact portion 110 and the rotating first shaft 300 to maintain sufficiently constant electrical contact.

[0045] like Figure 2 In the illustrated embodiment, the conductive ring 100 is sleeved on the first shaft 300. In the radial outward direction of the first shaft 300, the first shaft 300, the first electrical contact portion 110, the conductive ring body 130 and the housing 200 are arranged in sequence. The first electrical contact portion 110 is in electrical contact with the outer peripheral surface of the first shaft 300 to continuously and stably conduct the shaft current on the first shaft 300 to the housing 200 through the conductive ring 100.

[0046] In some embodiments of the present invention, the second electrical contact portion 120 is located between the conductive ring body 130 and the end surface of the second shaft 400. In the axial direction of the second shaft 400, the second electrical contact portion 120 is located between the end surface of the second shaft 400 and the conductive ring body 130, and the second electrical contact portion 120 is in electrical contact with the end surface of the second shaft 400. The shaft current on the second shaft 400 can be sequentially conducted to the housing 200 through the second electrical contact portion 120 and the conductive ring body 130.

[0047] The above arrangement, relative to the arrangement in which the second electrical contact portion 120 is located between the outer circumference of the second shaft 400 and the conductive ring body 130, reduces the axial length of the second shaft 400 on the one hand, which is conducive to reducing the profile size of the electric drive device in the axial direction. If the second electrical contact portion 120 and the second shaft 400 are in radial electrical contact, a section of the second shaft 400 close to the first shaft 300 needs to be reserved for abutment with the second electrical contact portion 120, which will increase the length of the second shaft 400. On the other hand, the second electrical contact portion 120 and the second shaft 400 are in axial electrical contact, which reduces the installation coaxiality requirements between the first shaft 300 and the housing 200. If the second electrical contact portion 120 is in radial electrical contact with the outer circumference of the second shaft 400, in order to ensure that the two are in full and stable contact, the conductive ring 100 disposed on the housing 200 needs to maintain a certain degree of coaxiality with the second shaft 400. If the two are eccentric, the second electrical contact portion 120 on the conductive ring 100 will not partially contact the outer circumference of the second shaft 400, or the second electrical contact portion 120 will not contact the outer circumference of the second shaft 400 evenly. Since the second shaft 400 is a high-speed rotating part, the second electrical contact portion 120 will wear after being in contact with the outer circumference of the second shaft 400 for a long time. After wear, partial contact or poor contact will also lead to unstable shaft current extraction.

[0048] like Figure 5and Fig.10 In the illustrated embodiment, the second electrical contact portion 120 is located between the conductive ring body 130 and the end surface of the second shaft 400. The second electrical contact portion 120 is in electrical contact with the end surface of the second shaft 400, which is beneficial to reducing the length of the second shaft 400 and reducing the installation coaxiality of the conductive ring 100 and the second shaft 400.

[0049] In some embodiments of the present invention, the electric drive device also includes a second bearing 600, the second shaft 400 is supported on the housing 200 through the second bearing 600, the second electrical contact portion 120 is located between the conductive ring body 130 and the inner ring of the second bearing 600, and the second electrical contact portion 120 is in electrical contact with the inner ring of the second bearing 600.

[0050] like Figures 1 to 4 As shown, in this embodiment, the inner ring of the second bearing 600 is sleeved and attached to the outer circumferential surface of the second shaft 400, and the second electrical contact portion 120 disposed between the inner ring of the second bearing 600 and the conductive ring body 130 can guide the shaft current on the second shaft 400 to the housing 200. In other words, the shaft current on the second shaft 400 flows to the housing 200 through the inner ring of the second bearing 600, the second electrical contact portion 120, and the conductive ring body 130 in sequence.

[0051] The second electrical contact portion 120 is located between the conductive ring body 130 and the end surface of the second shaft 400, and the second electrical contact portion 120 is in electrical contact with the end surface of the second shaft 400, which is equivalent to the conductive ring 100 directly exporting the shaft current on the second shaft 400 to the housing 200 through the second electrical contact portion 120. The second electrical contact portion 120 is located between the conductive ring body 130 and the inner ring of the second bearing 600, and the second electrical contact portion 120 is in electrical contact with the inner ring of the second bearing 600, which is equivalent to the conductive ring 100 indirectly exporting the shaft current on the second shaft 400 to the housing 200 through the second electrical contact portion 120.

[0052] The beneficial effect of the indirect axial electrical contact between the second electrical contact portion 120 and the second shaft 400 for deriving the shaft current has been pointed out above and will not be repeated here. Compared with the direct electrical contact between the second electrical contact portion 120 and the second shaft 400, when the second electrical contact portion 120 and the second shaft 400 are in indirect electrical contact through the inner ring of the second bearing 600, since the diameter of the inner ring of the second bearing 600 is larger than the diameter of the bearing mounting portion of the second shaft 400, the electrical contact between the second electrical contact portion 120 and the inner ring of the second bearing 600 is equivalent to increasing the electrical contact area of ​​the second electrical contact portion 120, which is beneficial to improving the speed of deriving the shaft current on the second shaft 400.

[0053] like Figure 1 , 2In the embodiments shown in Figures , 3, 4, 6, 7, 8, and 9, the electric drive device also includes a second bearing 600, the inner ring of the second bearing 600 is sleeved and interference-fitted on the shaft end of the second shaft 400 close to the first shaft 300, and the second electrical contact portion 120 is located between the conductive ring body 130 and the inner ring of the second bearing 600, thereby increasing the electrical contact area of ​​the second electrical contact portion 120, which is beneficial to quickly conduct the shaft current on the second shaft 400 to the housing 200.

[0054] In some embodiments of the present invention, the first electrical contact portion 110 includes a first conductive brush 140, one end of which is fixed to the conductive ring body 130, and the other end of the first conductive brush 140 abuts against the outer circumference of the first shaft 300. Since the first shaft 300 is a rotating part, a conductive brush that can be deformed and has good conductivity becomes a better choice to ensure that an effective conductive path is formed between the moving first shaft 300 and the stationary housing 200. Since the conductive brush is soft in texture and can be deformed to fully abut against the outer circumference of the first shaft 300, even if the electric drive device is in a bumpy and vibrating working environment, the conductive brush can ensure good electrical contact with the first shaft 300, thereby increasing the working reliability of the electric drive device.

[0055] The conductive brush may be of a structure and material in the prior art, and this application does not limit this. Figures 13 to 15 As shown, the first conductive brush 140 includes a conductive brush base 141 and conductive bristles 142. The conductive brush base 141 is annular, and the number of conductive bristles 142 is multiple groups. The multiple groups of conductive bristles 142 are arranged at equal intervals on the radial inner side of the conductive brush base 141. The first end of each group of conductive bristles 142 is fixed to the radial inner side of the conductive brush base 141, and the other end extends radially inward in a free state. The radial outer side of the conductive brush base 141 is fixedly connected to the conductive ring body 130. The first conductive brush 140 is sleeved on the first shaft 300, and the free end of each group of conductive bristles 142 abuts against the outer peripheral surface of the first shaft 300. It can be understood that in order to ensure that each group of conductive bristles 142 is in full contact with the first shaft 300, the diameter of the circle formed by the radially inner connection structure of the free ends of each group of conductive bristles 142 is smaller than the diameter of the contact portion between the first shaft 300 and the conductive bristles 142. This arrangement can not only ensure that the conductive bristles 142 are in full contact with the outer circumference of the first shaft 300 in the initial state, but also ensure that the conductive bristles 142 have a certain wear margin.

[0056] In some embodiments, such as Figures 1 to 3The conductive ring body 130 is provided with a mounting groove on the radial inner side, and the mounting groove has two side walls. Elastic pins 143 are provided on both axial sides of the conductive brush base 141, and the elastic pins 143 can be compressed or stretched in the axial direction. The conductive brush base 141 can be clamped in the mounting groove on the inner side of the conductive ring body 130, and the elastic pins 143 abut against the side walls of the mounting groove by the compression elastic force. In order to firmly install the conductive brush base 141 on the conductive ring body 130, there can be multiple elastic pins 143 on the conductive brush to increase the clamping elastic force.

[0057] In some embodiments, the conductive bristles 142 may be carbon fiber conductive bristles 142 .

[0058] In some embodiments, such as Figures 1 to 3 The two side walls of the installation groove of the conductive brush base 141 on the conductive ring body 130 can reuse the side walls of the first sealing body 1311 and the side walls of the second sealing body 1321, that is, the elastic pins 143 on both axial sides of the conductive brush base 141 can be elastically clamped on the opposite sides of the first sealing body 1311 and the second sealing body 1321. The structure, position and other functions of the first sealing body 1311 and the second sealing body 1321 will be introduced and explained below.

[0059] In some embodiments of the present invention, the conductive ring body 130 includes a first sealing portion 131 and a second sealing portion 132, the first sealing portion 131 extends from the radial inner side of the conductive ring body 130 to the outer circumference of the first shaft 300, and the second sealing portion 132 extends from the radial inner side of the conductive ring body 130 to the outer circumference of the first shaft 300; the first conductive brush 140 is located between the first sealing portion 131 and the second sealing portion 132; the radial inner side of the conductive ring 100, the first sealing portion 131, the second sealing portion 132 and the outer circumference of the first shaft 300 enclose a first sealed space S1, so that the first conductive brush 140 is located in the first sealed space S1.

[0060] Since the friction surfaces of the transmission structure, such as gear pairs and bearings, need lubrication and cooling, there will be lubricating oil inside the electric drive device and on the surface of the first shaft 300, that is, there will be lubricating oil between the conductive brush and the first shaft 300. The lubricating oil usually has a high resistivity and is not easy to conduct electricity, which affects the electrical contact between the first conductive brush 140 and the first shaft 300, and further affects the effect of the shaft current extraction on the first shaft 300. In order to ensure that a good conductive path is formed between the first conductive brush 140 and the first shaft 300, the first conductive brush 140 is set in a sealed space to prevent the lubricating oil from entering between the conductive brush and the first shaft 300.

[0061] Specifically, Figure 3The conductive ring body 130 includes a first sealing portion 131 and a second sealing portion 132. The first sealing portion 131 extends from the radial inner side of the conductive ring body 130 to the outer peripheral surface of the first shaft 300, and the second sealing portion 132 extends from the radial inner side of the conductive ring body 130 to the outer peripheral surface of the first shaft 300. The first sealing portion 131 and / or the second sealing portion 132 can be integrally formed with the conductive ring body 130, and the radial outer ends of the first sealing portion 131 and / or the second sealing portion 132 can also be sealed and fixedly connected to the radial inner side of the conductive ring body 130 by welding, bonding, etc. The radial inner ends of the first sealing portion 131 and the second sealing portion 132 are both sealed and abutted against the outer peripheral surface of the first shaft 300. In this way, the conductive ring body 130 itself can enclose a sealed space with the first shaft 300, namely the first sealed space S1, so as to isolate and seal the first conductive brush 140 in the oil-free space, thereby ensuring the conductive ring 100 to extract the shaft current from the first shaft 300. At the same time, there is no need to set up an additional sealing structure in the electric drive device to provide sealing protection for the first conductive brush 140, thereby making the structure of the electric drive device more compact.

[0062] In some embodiments of the present invention, the first sealing portion 131 includes a first sealing body 1311 and a first sealing lip 1312, the first sealing body 1311 is connected between the conductive ring body 130 and the first sealing lip 1312, the radial outer side of the first sealing lip 1312 is sealed with the first sealing body 1311, and the radial inner side of the first sealing lip 1312 is elastically connected to the outer peripheral surface of the first shaft 300 to form a sealing structure therebetween;

[0063] And / or, the second sealing portion 132 includes a second sealing body 1321 and a second sealing lip 1322, the second sealing body 1321 is connected between the conductive ring body 130 and the second sealing lip 1322, the radial outer side of the second sealing lip 1322 is sealed to the second sealing body 1321, and the radial inner side of the second sealing lip 1322 is elastically connected to the outer peripheral surface of the first shaft 300 to form a sealing structure therebetween.

[0064] For details, please continue to see Figure 3The first sealing part 131 forms a sealing structure by sealingly connecting the first sealing lip 1312 on the radial inner side thereof and the outer peripheral surface of the first shaft 300, and the second sealing part 132 forms a sealing structure by sealingly connecting the second sealing lip 1322 on the radial inner side thereof and the outer peripheral surface of the first shaft 300, so that the first sealing part 131 and the second sealing part 132 respectively form a rotating sealing structure with the first shaft 300. The sealing structure between the first sealing lip 1312 and the first sealing body 1311 and the first shaft 300 can refer to the sealing structure of the rotary oil seal in the prior art in combination with the actual use situation, and the present application does not limit it. Similarly, the sealing structure between the second sealing lip 1322 and the second sealing body 1321 and the first shaft 300 can refer to the sealing structure of the rotary oil seal in the prior art in combination with the actual use situation.

[0065] In some embodiments of the present invention, the second electrical contact portion 120 includes a second conductive brush 150 , one end of the second conductive brush 150 is fixed to the conductive ring body 130 , and the other end of the second conductive brush 150 abuts against the inner ring end surface of the second bearing 600 .

[0066] like Figures 1 to 3 The second conductive brush 150 is electrically connected between the conductive ring body 130 and the inner end surface of the second bearing 600, and can stably and continuously guide the shaft current on the second shaft 400 to the housing 200. The beneficial effect of providing a conductive brush between the inner ring of the second bearing 600 that rotates with the second shaft 400 and the conductive ring body 130 to form a shaft current path is the same as that of the first conductive brush 140, which will not be repeated here.

[0067] In some embodiments of the present invention, Figure 1 The second shaft 400 includes a hollow section, which is sleeved on the first shaft 300, and the second bearing 600 is arranged on the radially outer side of the hollow section. The hollow here means that this part of the second shaft 400 is a hollow structure, specifically, the second shaft 400 is axially dug out from the end face close to the first shaft 300 to form a semi-enclosed space in the second shaft 400 or an open space that runs through the two end faces of the second shaft 400. It can be understood that the inner wall surface of the space is a cylinder with the axis of the second shaft 400 as the axis center line.

[0068] The second shaft 400 and the first shaft 300 are sleeved through a hollow section. On the one hand, it is convenient to set a power transmission structure between the first shaft 300 and the second shaft 400. Compared with the power transmission between two shafts that are not sleeved through a coupling, the second shaft 400 is sleeved on the outside of the first shaft 300, and the second shaft 400 and the first shaft 300 can be keyed, which has a simple structure, convenient processing, and low cost. Specifically, there can be a keyway on the second shaft 400, and a key can be set on the first shaft 300. Of course, the key connection here can be a flat key connection, a spline connection, or other forms of key connection.

[0069] The second shaft 400 and the first shaft 300 are connected by a hollow section. Secondly, compared with the coupling connection, the connection structure is more compact. More importantly, the distance from the end face of the second shaft 400 to the conductive ring 100 sleeved on the first shaft 300 close to one end of the second shaft 400 is shortened, so as to facilitate the setting of the conductive structure between the end face of the second shaft 400 or the end face of the second bearing 600 and the conductive ring body 130.

[0070] In some embodiments of the present invention, the conductive ring body 130 further includes a third sealing portion 133 and a fourth sealing portion 134, wherein the third sealing portion 133 extends from the axial side surface of the conductive ring body 130 to the inner ring end surface of the second bearing 600; one end of the fourth sealing portion 134 is sealed and connected to the conductive ring body 130, and the other end of the fourth sealing portion 134 is sealed and connected to the inner ring end surface of the second bearing 600, and the third sealing portion 133, the inner ring end surface of the second bearing 600, the fourth sealing portion 134 and the axial side surface of the conductive ring body 130 enclose a second sealed space S2; or, one end of the fourth sealing portion 134 is sealed and connected to the conductive ring body 130, and the other end of the fourth sealing portion 134 is sealed and connected to the second shaft 40 0, the third sealing part 133, the inner ring end face of the second bearing 600, the end face of the second shaft 400, the fourth sealing part 134 and the axial side face of the conductive ring body 130 enclose a second sealed space S2; or, one end of the fourth sealing part 134 is sealedly connected to the conductive ring body 130, and the other end of the fourth sealing part 134 is sealedly connected to the outer circumferential surface of the first shaft 300, and the third sealing part 133, the inner ring end face of the second bearing 600, the end face of the second shaft 400, the outer circumferential surface of the first shaft 300, the fourth sealing part 134, the axial side face of the conductive ring body 130 and the radial side face of the conductive ring body 130 together enclose a second sealed space S2; the second conductive brush 150 is located in the second sealed space S2.

[0071] Specifically, Figure 6The conductive ring body 130 includes a third sealing part 133 and a fourth sealing part 134. One end of the third sealing part 133 is sealed and connected to the conductive ring body 130, and the other end of the third sealing part 133 is sealed and connected to the end face of the second bearing 600. One end of the fourth sealing part 134 is sealed and connected to the conductive ring body 130, and the other end of the fourth sealing part 134 is sealed and connected to the inner ring end face of the second bearing 600. The third sealing part 133, the inner ring end face of the second bearing 600, the fourth sealing part 134 and the axial side of the conductive ring body 130 enclose a second sealed space S2, and the second conductive brush 150 is located in the second sealed space S2. The second conductive brush 150 is sealed in the second sealed space S2 to isolate it from the lubricating oil liquid inside the electric drive device, so as to prevent the lubricating oil liquid from entering the contact gap between the second conductive brush 150 and the end face of the second bearing 600, forming an insulating diaphragm, and affecting the extraction of the shaft current on the second shaft 400.

[0072] In some embodiments, Figure 7 One end of the third sealing portion 133 is sealed and connected to the conductive ring body 130, and the other end of the third sealing portion 133 is sealed and connected to the end face of the second bearing 600. One end of the fourth sealing portion 134 is sealed and connected to the conductive ring body 130, and the other end of the fourth sealing portion 134 is sealed and connected to the end face of the second shaft 400. The third sealing portion 133, the inner ring end face of the second bearing 600, the end face of the second shaft 400, the fourth sealing portion 134 and the axial side face of the conductive ring body 130 enclose a second sealed space S2, and the second conductive brush 150 is located in the second sealed space S2.

[0073] Since the inner ring of the second bearing 600 needs to rotate together with the second shaft 400, the inner ring of the second shaft 400 is usually press-fitted onto the second shaft 400 with interference fit, and therefore, the inner ring of the second bearing 600 and the second shaft 400 are also sealed. In this embodiment, the second conductive brush 150 is also sealed in the second sealed space S2 to be isolated from the lubricating oil inside the electric drive device, so as to prevent the lubricating oil from entering the contact gap between the second conductive brush 150 and the end surface of the second bearing 600, forming an insulating diaphragm, and affecting the extraction of the shaft current on the second shaft 400.

[0074] In some embodiments, Figure 8, one end of the third sealing part 133 is sealed and connected to the conductive ring body 130, the other end of the third sealing part 133 is sealed and connected to the end face of the second bearing 600, one end of the fourth sealing part 134 is sealed and connected to the conductive ring body 130, the other end of the fourth sealing part 134 is sealed and connected to the outer peripheral surface of the first shaft 300, the third sealing part 133, the inner ring end face of the second bearing 600, the end face of the second shaft 400, the outer peripheral surface of the first shaft 300, the fourth sealing part 134, the axial side face of the conductive ring body 130 and the radial side face of the conductive ring body 130 together enclose the second sealed space S2, and the second conductive brush 150 is located in the second sealed space S2. In this embodiment, the second conductive brush 150 is also sealed in the second sealed space S2 to isolate it from the lubricating oil liquid inside the electric drive device, so as to prevent the lubricating oil liquid from entering the contact gap between the second conductive brush 150 and the end face of the second bearing 600, thereby forming an insulating diaphragm and affecting the extraction of the shaft current on the second shaft 400.

[0075] Figure 6 , Figure 7 and Figure 8 In the three illustrated embodiments, the setting positions of the fourth sealing portion 134 are all different. In actual implementation, the specific setting position of the fourth sealing portion 134 can be comprehensively considered based on factors such as the shaft diameter of the second shaft 400 and the inner ring thickness of the second bearing 600.

[0076] In some embodiments of the present invention, Fig. 9 The first electrical contact portion 110 includes a first conductive brush 140, one end of which is fixed to the conductive ring body 130, and the other end of which abuts against the outer circumferential surface of the first shaft 300; the second electrical contact portion 120 includes a second conductive brush 150, one end of which is fixed to the conductive ring body 130, and the other end of which abuts against the end surface of the second shaft 400 or the end surface of the inner ring of the second bearing 600; the conductive ring body 130 includes a fifth sealing portion 135 and a sixth sealing portion 136, and the fifth sealing portion 135 is fixed to the conductive ring body 130, and the other end of which abuts against the end surface of the second shaft 400 or the end surface of the inner ring of the second bearing 600. The sixth sealing portion 136 extends from the axial side surface of the conductive ring body 130 to the inner ring end surface of the second bearing 600, and the sixth sealing portion 136 extends from the radial inner side surface of the conductive ring body 130 to the outer peripheral surface of the first shaft 300; the fifth sealing portion 135, the inner ring end surface of the second bearing 600, the end surface of the second shaft 400, the outer peripheral surface of the first shaft 300, the sixth sealing portion 136, the radial inner side surface of the conductive ring body 130 and the axial side surface of the conductive ring body 130 together enclose a third sealed space S3, and the first conductive brush 140 and the second conductive brush 150 are both located in the third sealed space S3.

[0077] In this embodiment, the first conductive brush 140 and the second conductive brush 150 share a sealed space, which is different from providing each conductive brush with a sealed space. The two sealing parts are omitted, and the conductive ring 100 has a simpler structure, is easier to manufacture, and has lower costs.

[0078] In some embodiments of the present invention, Fig.10 The conductive ring body 130 includes a first sealing portion 131 and a second sealing portion 132. The first sealing portion 131 extends from the radial inner side of the conductive ring body 130 to the outer peripheral surface of the first shaft 300, and the second sealing portion 132 extends from the radial inner side of the conductive ring body 130 to the outer peripheral surface of the first shaft 300; the first conductive brush 140 is located between the first sealing portion 131 and the second sealing portion 132; the radial inner side of the conductive ring 100, the first sealing portion 131, the second sealing portion 132 and the outer peripheral surface of the first shaft 300 enclose a first sealed space S1, so that the first conductive brush 140 is located in the first sealed space S1; the second electrical contact portion 120 includes a second conductive Brush 150, one end of the second conductive brush 150 is fixed on the conductive ring body 130, and the other end of the second conductive brush 150 abuts against the end face of the inner ring of the second shaft 400 or the second bearing 600; the conductive ring body 130 also includes a third sealing portion 133, and the third sealing portion 133 extends from the axial side of the conductive ring body 130 to the inner ring end face of the second bearing 600; the first sealing portion 131, the axial side of the conductive ring body 130, the third sealing portion 133, the inner ring end face of the second bearing 600, the end face of the second shaft 400 and the outer peripheral surface of the first shaft 300 enclose a second sealed space S2, and the second conductive brush 150 is located in the second sealed space S2.

[0079] In this embodiment, the first sealing portion 131 is reused as a part of forming the second sealed space S2. Similarly, the first conductive brush 140 is isolated in the first sealed space S1, and the second conductive brush 150 is isolated in the second sealed space S2, so as to prevent lubricating oil from entering the first sealed space S1 and the second sealed space S2, which is beneficial to enhancing the effect of the conductive ring 100 on the extraction of shaft current on the first shaft 300 and the second shaft 400.

[0080] In some embodiments, the third sealing portion 133 may also include a third sealing body 1331 and a third sealing lip 1332. Figure 3 As shown, the third sealing body 1331 is connected between the conductive ring body 130 and the third sealing lip 1332, one end of the third sealing lip 1332 is sealedly connected to the third sealing body 1331, and the other end of the third sealing lip 1332 is elastically connected to the end face of the inner ring of the second bearing 600 to form a sealing structure between the two.

[0081] It should be noted that Figures 8 to 10In the illustrated embodiment, when the end surface of the second shaft 400 and the end surface of the first shaft 300 are required to enclose a part of the first sealed space S1 or the second sealed space S2 or the third sealed space S3, a seal (not shown in the figure) needs to be provided between the first shaft 300 and the second shaft 400. Specifically, a sealing groove may be provided on the first shaft 300, and a sealing ring or an oil seal may be provided in the sealing groove to form a sealed connection between the first shaft 300 and the second shaft 400.

[0082] In some embodiments of the present invention, Figures 11 to 13 The conductive ring 100 is configured to be symmetrical on both sides of the axial direction, which facilitates the processing and manufacturing of the conductive ring 100, eliminates the error-proofing requirements for the assembly of the conductive ring 100, and improves the production efficiency of the electric drive device. Specifically, the second conductive brush 150 and the corresponding sealing structure are provided on both sides of the axial direction of the conductive ring body 130. When assembling the conductive ring 100, there is no need to specifically confirm that the side of the conductive ring 100 provided with the second conductive brush 150 is assembled toward the second bearing 600, thereby improving the production cycle.

[0083] In some embodiments, when the second conductive brushes 150 are disposed on both sides of the conductive ring body 130, Figure 1 As shown, the first conductive brush 140 can be omitted, and the conductive brushes on both sides of the conductive ring 100 are in electrical contact with the inner ring end faces of the second bearing 600 and the inner ring end faces of the first bearing 500 respectively. The conductive ring 100 simultaneously conducts the shaft current on the first shaft 300 and the second shaft 400 to the housing 200 through the conductive brushes on both sides of the axial direction, and protects the bearings on the first shaft 300 and the second shaft 400 from electrical corrosion damage.

[0084] In some embodiments of the present invention, Figure 3 The first shaft 300 is supported on the housing 200 through a first bearing 500, the second shaft 400 is supported on the housing 200 through a second bearing 600, and the conductive ring 100 is located between the first bearing 500 and the second bearing 600; the conductive ring 100 includes a conductive ring body 130, the conductive ring body 130 is disposed on the housing 200, one end of the first electrical contact portion 110 is fixedly connected to the conductive ring body 130, the other end of the first electrical contact portion 110 is in electrical contact with the first shaft 300, and one end of the second electrical contact portion 120 is in electrical contact with the first shaft 300. The conductive ring body 130 is fixedly connected, and the other end of the second electrical contact portion 120 is electrically contacted with the second shaft 400; the first oil channel 137 is provided on the conductive ring body 130, and the first oil channel 137 has an oil inlet 1371, a first oil outlet 1372 and a second oil outlet 1373. A lubricating oil channel 210 is provided on the shell 200, and the lubricating oil channel 210 is connected to the oil inlet 1371, and the first oil outlet 1372 discharges oil toward the raceway of the first bearing 500, and the second oil outlet 1373 discharges oil toward the raceway of the second bearing 600.

[0085] The cooling and lubrication of the bearing are crucial to its own life and the life of the electric drive device. In some use occasions, splash lubrication through gear oil stirring cannot meet the lubrication and cooling needs of the bearing, and the amount of lubricating oil and / or lubrication parts may not meet the use requirements. In this case, active oil spray lubrication becomes a better option. Some related technologies set lubricating oil pipes at the lubrication demand parts of the bearings in the electric drive device, and the lubricating oil is sprayed and lubricated at the required flow rate through the oil pipes under the action of the oil pump; another part of the related technology sets a lubricating oil channel 210 on the bearing mounting seat of the housing 200 to perform close-range oil spray lubrication and cooling of the bearing. However, when a conductive ring 100 is set near the bearing of the housing 200 to ensure that the bearing is protected from the harm of the shaft current, and a lubricating oil channel 210 is set to lubricate and cool the bearing, on the one hand, the structure of the electric drive device is complicated, and on the other hand, processing the first oil channel 137 with an oil inlet 1371, a first oil outlet 1372 and a second oil outlet 1373 on the housing 200 increases the difficulty of processing the housing 200.

[0086] In this embodiment, by setting the first oil passage 137 on the conductive ring 100, the first oil passage 137 sprays oil to the second bearing 600 through the first oil outlet 1372, and at the same time, sprays oil to the first bearing 500 through the second oil outlet 1373, the conductive ring 100 with a relatively simple structure and processing is used to ensure lubrication and cooling of the first bearing 500 and the second bearing 600. It can be understood that in order to ensure the lubrication effect of the bearings, the first oil outlet 1372 discharges oil toward the raceway of the second bearing 600, and the second oil outlet 1373 discharges oil toward the raceway of the first bearing 500.

[0087] It can also be understood that the first oil passage 137 is connected to the lubrication system of the electric drive device, namely the lubrication oil passage 210. In order to omit the external oil pipe connecting the first oil passage 137 and the lubrication oil passage 210 on the conductive ring 100, the lubrication oil passage 210 is formed on the housing 200, and the conductive ring 100 is installed in the mounting hole on the housing 200 with interference fit. The first oil passage 137 is arranged on the conductive ring body 130, which facilitates the communication between the inlet of the first oil passage 137 and the lubrication oil passage 210, and also facilitates the isolation of the first conductive brush 140 and / or the second conductive brush 150 from the lubrication oil. Such an arrangement improves the integration of the electric drive device and reduces the processing difficulty of the housing 200.

[0088] In recent years, in order to improve the power density of motors, the speed of motors has become higher and higher. For high-speed rotating bearings, the lubricating oil will inevitably be impacted by airflow, atomized, and centrifuged before reaching the rolling elements in the raceway. That is, there is a "wind barrier", which greatly reduces the amount of effective lubricating oil entering the bearing raceway.

[0089] In some embodiments of the present invention, Figure 3, in the radial direction of the first shaft 300 or the second shaft 400, the distance from the first oil outlet 1372 to the inner side of the outer ring of the second bearing 600 is L1, and the distance from the first oil outlet 1372 to the outer side of the inner ring of the second bearing 600 is L2, L1>L2; and / or, the distance from the second oil outlet 1373 to the inner side of the outer ring of the first bearing 500 is L3, and the distance from the second oil outlet 1373 to the outer side of the inner ring of the first bearing 500 is L4, L3>L4. In other words, in the radial direction, the first oil outlet 1372 is arranged closer to the inner ring of the second bearing 600, so that the oil entering the raceway of the second bearing 600 from the first oil outlet 1372 passes through the raceway of the second bearing 600 for a longer time or a larger amount, and the centrifugal force on the centrifugal splashing effect of the lubricating oil is reduced, so as to more fully and effectively lubricate and cool the second bearing 600. Similarly, the second oil outlet 1373 is arranged closer to the inner ring of the first bearing, so that the oil entering the raceway of the first bearing 500 from the second oil outlet 1373 passes through the raceway of the first bearing 500 for a longer time or more, reducing the centrifugal splashing effect of the centrifugal force on the lubricating oil, thereby more fully and effectively lubricating and cooling the first bearing 500. In this way, the life of the first bearing 500 and the second bearing 600 is improved, and then the life of the electric drive device is improved.

[0090] In some embodiments, Fig.12 The number of the first oil outlet 1372 and / or the second oil outlet 1373 is multiple, which can improve the lubrication and cooling effect of the first oil channel 137 on the first bearing 500 and the second bearing 600.

[0091] In some embodiments, multiple first oil outlets 1372 and / or second oil outlets 1373 are arranged at equal intervals in the circumferential direction of the conductive ring body 130, further improving the uniformity of cooling and lubricating the first oil channel 137 to the first bearing 500 and the second bearing 600, thereby enhancing the cooling and lubrication effect.

[0092] An embodiment of the present invention further provides a powertrain, including the above-mentioned electric drive device. The powertrain provided by the present invention has all the beneficial effects of the above-mentioned electric drive device. The powertrain can be a pure electric powertrain, a hybrid powertrain, and of course a fuel powertrain.

[0093] An embodiment of the present invention further provides a vehicle, comprising the above-mentioned electric drive device or power assembly. The vehicle provided by the present invention has all the beneficial effects of the above-mentioned electric drive device or power assembly.

[0094] In the description of this specification, the description with reference to the terms "specific embodiment", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0095] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An electric drive device, characterized in that: include: case; A first shaft rotatably supported on the housing; A second shaft, coaxially connected to the first shaft and rotatably supported on the housing; The conductive ring is disposed on the housing and includes a first electrical contact portion and a second electrical contact portion, wherein the first electrical contact portion is in electrical contact with the first shaft, and the second electrical contact portion is in electrical contact with the second shaft.

2. The electric drive device according to claim 1, characterized in that: The conductive ring further comprises a conductive ring body, the conductive ring is sleeved on the first shaft, the first electrical contact portion is located between the conductive ring body and the first shaft, and the first electrical contact portion is in electrical contact with an outer circumferential surface of the first shaft.

3. The electric drive device according to claim 2, characterized in that: The second electrical contact portion is located between the conductive ring body and the end surface of the second shaft, and the second electrical contact portion is in electrical contact with the end surface of the second shaft.

4. The electric drive device according to claim 2, characterized in that: It also includes a second bearing, the second shaft is supported on the housing through the second bearing, the second electrical contact portion is located between the conductive ring body and the inner ring of the second bearing, and the second electrical contact portion is in electrical contact with the inner ring of the second bearing.

5. The electric drive device according to claim 2, characterized in that: The first electrical contact portion includes a first conductive brush, one end of which is fixed to the conductive ring body, and the other end of which is in contact with the outer peripheral surface of the first shaft.

6. The electric drive device according to claim 5, characterized in that: The conductive ring body comprises a first sealing portion and a second sealing portion, wherein the first sealing portion extends from the radial inner side of the conductive ring body to the outer peripheral surface of the first shaft, and the second sealing portion extends from the radial inner side of the conductive ring body to the outer peripheral surface of the first shaft; The first conductive brush is located between the first sealing portion and the second sealing portion; The radial inner side surface of the conductive ring, the first sealing portion, the second sealing portion, and the outer peripheral surface of the first shaft enclose a first sealed space, so that the first conductive brush is located in the first sealed space.

7. The electric drive device according to claim 6, characterized in that: The first sealing portion comprises a first sealing body and a first sealing lip, wherein the first sealing body is connected between the conductive ring body and the first sealing lip, the radial outer side of the first sealing lip is sealingly connected to the first sealing body, and the radial inner side of the first sealing lip is elastically connected to the outer peripheral surface of the first shaft to form a sealing structure therebetween; And / or, the second sealing portion includes a second sealing body and a second sealing lip, the second sealing body is connected between the conductive ring body and the second sealing lip, the radial outer side of the second sealing lip is sealed to the second sealing body, and the radial inner side of the second sealing lip is elastically connected to the outer peripheral surface of the first shaft to form a sealing structure therebetween.

8. The electric drive device according to claim 4, characterized in that: The second electrical contact portion includes a second conductive brush, one end of which is fixed to the conductive ring body, and the other end of which is in contact with an inner ring end surface of the second bearing.

9. The electric drive device according to claim 8, characterized in that: The second shaft comprises a hollow section, the hollow section is sleeved on the first shaft, and the second bearing is arranged on the radial outer side of the hollow section.

10. The electric drive device according to claim 8, characterized in that: The conductive ring body further includes a third sealing portion and a fourth sealing portion, wherein the third sealing portion extends from the axial side surface of the conductive ring body to the inner ring end surface of the second bearing; One end of the fourth sealing portion is sealed and connected to the conductive ring body, and the other end of the fourth sealing portion is sealed and connected to the inner ring end surface of the second bearing. The third sealing portion, the inner ring end surface of the second bearing, the fourth sealing portion and the axial side surface of the conductive ring body enclose a second sealed space, and the second conductive brush is located in the second sealed space. Alternatively, one end of the fourth sealing portion is sealedly connected to the conductive ring body, the other end of the fourth sealing portion is sealedly connected to the end surface of the second shaft, the third sealing portion, the inner ring end surface of the second bearing, the end surface of the second shaft, the fourth sealing portion and the axial side surface of the conductive ring body enclose a second sealed space, and the second conductive brush is located in the second sealed space; Alternatively, one end of the fourth sealing portion is sealed and connected to the conductive ring body, and the other end of the fourth sealing portion is sealed and connected to the outer circumferential surface of the first shaft, and the third sealing portion, the inner ring end face of the second bearing, the end face of the second shaft, the outer circumferential surface of the first shaft, the fourth sealing portion, the axial side face of the conductive ring body and the radial side face of the conductive ring body together enclose a second sealed space, and the second conductive brush is located in the second sealed space.

11. The electric drive device according to claim 5, characterized in that: The second electrical contact portion comprises a second conductive brush, one end of which is fixed to the conductive ring body, and the other end of which is in contact with the end surface of the second shaft or the end surface of the inner ring of the second bearing; The conductive ring body comprises a fifth sealing portion and a sixth sealing portion, wherein the fifth sealing portion extends from the axial side surface of the conductive ring body to the inner ring end surface of the second bearing, and the sixth sealing portion extends from the radial inner side surface of the conductive ring body to the outer peripheral surface of the first shaft; The fifth sealing portion, the inner ring end face of the second bearing, the end face of the second shaft, the outer peripheral surface of the first shaft, the sixth sealing portion, the radial inner side face of the conductive ring body and the axial side face of the conductive ring body together enclose a third sealed space, and the first conductive brush and the second conductive brush are both located in the third sealed space.

12. The electric drive device according to claim 6, characterized in that: The second electrical contact portion comprises a second conductive brush, one end of which is fixed to the conductive ring body, and the other end of which is in contact with the end surface of the second shaft or the inner ring of the second bearing; The conductive ring body further includes a third sealing portion, and the third sealing portion extends from the axial side surface of the conductive ring body to the inner ring end surface of the second bearing; The first sealing portion, the axial side surface of the conductive ring body, the third sealing portion, the inner ring end surface of the second bearing, the end surface of the second shaft and the outer peripheral surface of the first shaft enclose a second sealed space, and the second conductive brush is located in the second sealed space.

13. The electric drive device according to any one of claims 1 to 12, characterized in that: The first shaft is supported on the housing through the first bearing, the second shaft is supported on the housing through the second bearing, and the conductive ring is located between the first bearing and the second bearing; The conductive ring comprises a conductive ring body, the conductive ring body is arranged on the housing, one end of the first electrical contact portion is fixedly connected to the conductive ring body, the other end of the first electrical contact portion is in electrical contact with the first shaft, one end of the second electrical contact portion is fixedly connected to the conductive ring body, the other end of the second electrical contact portion is in electrical contact with the second shaft; The first oil channel is arranged on the conductive ring body, and the first oil channel has an oil inlet, a first oil outlet and a second oil outlet. A lubricating oil channel is arranged on the shell, and the lubricating oil channel is connected to the oil inlet. The first oil outlet discharges oil toward the raceway of the first bearing, and the second oil outlet discharges oil toward the raceway of the second bearing.

14. The electric drive device according to claim 13, characterized in that: The number of the first oil outlet and / or the second oil outlet is plural.

15. A powertrain, characterized in that Includes the electric drive device described in any one of items 1-14.

16. A vehicle, comprising the powertrain according to claim 15 or the electric drive device according to any one of claims 1 to 14.

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