Electric drive system and vehicle

Abstract

The present application relates to the technical field of electric drive, and provides an electric drive system and a vehicle. The electric drive system comprises a housing, a motor assembly, and a reducer assembly; the housing has an accommodating cavity, the motor assembly and the reducer assembly are both arranged in the accommodating cavity, and the reducer assembly comprises a center gear, first planetary gears, second planetary gears, a planetary carrier, an inner ring gear, and a differential; the motor assembly comprises a motor body and an output shaft, wherein the motor body is configured to drive the output shaft to rotate; the output shaft is connected to the center gear; the center gear is engaged with the first planetary gears; the second planetary gears are engaged with the inner ring gear; the inner ring gear is connected to the housing; the first planetary gears and the second planetary gears are coaxially connected to the planetary carrier; and the planetary carrier is connected to the differential. In this way, a compound planetary gear set structure is formed, thereby reducing the space occupied by the reducer assembly, and reducing the size and weight of the electric drive system.

Description

Electric drive systems and vehicles

[0001] This application claims priority to Chinese Patent Application No. 202411513667.1, filed on October 28, 2024, entitled "Electric Drive System and Vehicle", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of electric drive technology, and in particular to an electric drive system and vehicle. Background Technology

[0003] With the rapid popularization of new energy vehicles, electric drive systems are developing rapidly towards higher power density, lower cost, higher integration, and higher efficiency. Under this trend, high power density requires motors with high power and compact size.

[0004] In related technologies, the electric drive system of new energy vehicles generally integrates a motor and a reducer. The output shaft of the motor cooperates with the reducer, so that the rotation of the motor output shaft is reduced by the reducer to output power. The reducer includes multiple gears, which mesh sequentially to perform multi-stage reduction and transmit power. The two meshing gears in each stage are arranged radially along the gear axis.

[0005] However, the large space occupied by the reducer in current electric drive systems results in a large overall size and weight of the electric drive system. Summary of the Invention

[0006] This application provides an electric drive system and vehicle to solve the technical problem that the large space occupied by the reducer in the current electric drive system leads to the large overall size and weight of the electric drive system.

[0007] In a first aspect, this application provides an electric drive system, which includes a housing, a motor assembly, and a reducer assembly; the housing has a receiving cavity, and the motor assembly and the reducer assembly are both disposed within the receiving cavity.

[0008] The reducer assembly includes a center gear, a first planetary gear, a second planetary gear, a planetary carrier, an internal gear ring, and a differential; the motor assembly includes a motor body and an output shaft, the motor body being configured to drive the output shaft to rotate; the output shaft is connected to the center gear; the center gear meshes with the first planetary gear; the second planetary gear meshes with the internal gear ring; the internal gear ring is connected to the housing; the first planetary gear and the second planetary gear are coaxially connected to the planetary carrier; the planetary carrier is connected to the differential.

[0009] The electric drive system provided in this application forms a double planetary gear structure by setting two coaxially connected planetary gears that cooperate with the center gear and the differential respectively. The power output from the motor output shaft to the center gear is transmitted to the differential through the revolution of the planetary carrier, thereby realizing the deceleration of the reducer assembly and power transmission, reducing the space occupied by the reducer assembly, and reducing the size and weight of the electric drive system.

[0010] As an optional implementation, the differential may include a differential housing, a first differential gear and a second differential gear, a planetary carrier that may be connected to the differential housing, the first differential gear that may be connected to the differential housing, the second differential gear that may mesh with the first differential gear, and the second differential gear that may be coaxially arranged with the output shaft.

[0011] With this configuration, the differential can utilize the axial space of the reducer assembly without having to be placed on the side of the reducer gear, thereby reducing the space occupied by the reducer assembly within the housing cavity.

[0012] As an optional implementation, the planetary support may include a support body and a connecting part, the support body being located on the side of the first planetary gear facing the motor assembly; a first end of the connecting part is connected to the support body, and a second end of the connecting part is connected to the differential housing.

[0013] This configuration allows the planetary support to be installed and positioned simultaneously with the differential housing, improving assembly convenience.

[0014] As an alternative implementation, the connecting part can be located between two adjacent first planetary gears.

[0015] This configuration allows for the use of the gaps between the first planetary gears to reduce the axial dimensions of the entire reducer assembly, thereby reducing space occupation and improving space utilization.

[0016] As an alternative implementation, the housing has a partition wall that divides the receiving cavity into a motor compartment and a reducer compartment, with the motor body located in the motor compartment and the reducer assembly located in the reducer compartment.

[0017] The isolation wall has a connecting hole through which the output shaft passes and extends from the motor compartment to the reducer compartment; a first bearing is provided in the connecting hole, and at least part of the main body of the bracket is located inside the first bearing and abuts against the inner ring of the first bearing.

[0018] This configuration improves the reliability of the planetary support and differential.

[0019] As an alternative implementation, the planetary support and differential housing can be a single molded component.

[0020] This setup simplifies assembly steps and reduces production costs.

[0021] As an optional implementation, there can be multiple first differential gears and two second differential gears. The multiple first differential gears are circumferentially spaced around the rotation axis of the differential housing; the two second differential gears are spaced along the length of the output shaft; each second differential gear meshes with multiple second differential gears simultaneously.

[0022] This configuration ensures the reliability of the power differential output.

[0023] As an alternative implementation, the electric drive system may also include a drive shaft, an output shaft having a through hole through which the drive shaft passes, and the drive shaft being connected to the second differential gear on the side closer to the motor assembly of the two second differential gears.

[0024] With this configuration, the power output from the differential can be transmitted to the end of the electric drive assembly that is furthest from the reducer assembly.

[0025] As an alternative implementation, the diameter of the first planetary gear is larger than the diameter of the second planetary gear; the first planetary gear is located on the side of the internal gear ring facing the motor assembly.

[0026] This configuration improves the compactness of the planetary gear layout in the reducer assembly and increases space utilization.

[0027] As an optional implementation, a first limiting baffle is provided on the outer circumferential side of the planetary carrier, and a second limiting baffle is provided on the outer circumferential side of the differential; the first limiting baffle is positioned on the side of the first planetary gear that is away from the second planetary gear, and the second limiting baffle is positioned on the side of the second planetary gear that is away from the first planetary gear.

[0028] This configuration improves the reliability and stability of the installation of the first and second planetary gears.

[0029] As an optional implementation, there are multiple first planetary gears and multiple second planetary gears, with the multiple first planetary gears arranged at intervals around the central gear; and multiple second planetary gears connected to the multiple first planetary gears in a one-to-one correspondence.

[0030] This configuration improves the transmission reliability of the reducer assembly and ensures good transmission efficiency and accuracy.

[0031] Secondly, this application provides a vehicle that includes the electric drive system described above.

[0032] This application provides an electric drive system and a vehicle. The electric drive system includes a housing, a motor assembly, and a reducer assembly. The housing has a receiving cavity, in which the motor assembly and the reducer assembly are both disposed. The reducer assembly includes a center gear, a first planetary gear, a second planetary gear, a planetary carrier, an internal gear ring, and a differential. The motor assembly includes a motor body and an output shaft. The motor body is configured to drive the output shaft to rotate. The output shaft is connected to the center gear. The center gear meshes with the first planetary gear. The second planetary gear meshes with the internal gear ring. The internal gear ring is connected to the housing. The first and second planetary gears are coaxially connected to the planetary carrier. The planetary carrier is connected to the differential, thereby forming a double planetary gear set structure. The power output from the motor output shaft to the center gear is transmitted to the differential through the revolution of the planetary carrier, thereby realizing the reduction of speed and power transmission of the reducer assembly, reducing the space occupied by the reducer assembly, and reducing the size and weight of the electric drive system.

[0033] In addition to the technical problems solved by the embodiments of this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that the electric drive system and vehicle provided by this application can solve, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific embodiments. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 is a schematic diagram of the electric drive system provided in an embodiment of this application;

[0036] Figure 2 is a cross-sectional view of the electric drive system provided in an embodiment of this application;

[0037] Figure 3 is a partial view of position A in Figure 2;

[0038] Figure 4 is a schematic diagram of the reducer assembly in the electric drive system provided in the embodiment of this application;

[0039] Figure 5 is a front view of the reducer assembly in the electric drive system provided in the embodiment of this application;

[0040] Figure 6 is an exploded view of the reducer assembly and drive shaft in the electric drive system provided in the embodiment of this application.

[0041] Explanation of reference numerals in the attached drawings: 10-Electric drive system; 100-Housing housing; 101-Receiving cavity; 101a-Motor compartment; 101b-Reducer compartment; 110-Isolation wall; 111-Connecting hole; 120-First bearing; 130-Second bearing; 200-Motor assembly; 210-Motor body; 220-Output shaft; 221-Through hole; 300-Reducer assembly; 310-Center gear; 320-First planetary gear; 330-Second planetary gear; 340-Planetary support; 341-Support body; 342-Connecting part; 343-First limiting baffle; 350-Internal gear ring; 360-Differential gear; 361-First differential gear; 362-Second differential gear; 363-Differential housing; 3631-Second limiting baffle; 400-Drive shaft. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] First, those skilled in the art should understand that these embodiments are merely for explaining the technical principles of this application and are not intended to limit the scope of protection of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0044] Secondly, it should be noted that in the description of this application, the terms "front", "rear", "left", "right", "up", "down", "inner", "outer", etc., which indicate the direction or positional relationship, are based on the direction or positional relationship shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0045] Furthermore, it should be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0046] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0047] Currently, the electric drive systems of new energy vehicles are rapidly developing towards higher power density, lower cost, higher integration, and higher efficiency. Under this trend, high power density requires high-power motors with compact sizes. The electric drive systems of new energy vehicles generally integrate a motor and a reducer. The motor's output shaft cooperates with the reducer, so that the rotation of the motor's output shaft is reduced in speed by the reducer to output power. The reducer includes multiple gears that mesh sequentially to perform multi-stage reduction and transmit power. The two meshing gears in each stage are arranged radially, forming a parallel-shaft gear transmission structure. Finally, the multiple reduction gears transmit power to the differential on the side of the reducer, which then outputs power to the vehicle's half-shafts.

[0048] However, in current electric drive systems, the parallel shaft reducer occupies a large space, and the differential is located on the side. This requires the electric drive housing to protrude a portion of its structure at the reducer end to accommodate the differential and the radially arranged reducer gears. As a result, the overall size and weight of the electric drive system are large. When applied to a vehicle, it will occupy a large amount of space on the vehicle chassis, thus limiting the layout space of other components on the vehicle.

[0049] To address the aforementioned issues, this application provides an electric drive system and vehicle. By configuring two coaxially connected planetary gears that cooperate with the center gear and the differential respectively, a double planetary gear set structure is formed. This allows the power output from the motor output shaft to the center gear to be transmitted to the differential via the revolution of the planetary carrier, reducing the space occupied by the reducer assembly and lowering the size and weight of the electric drive system.

[0050] The technical solution of this application will be described in detail below through specific embodiments.

[0051] Figure 1 is a schematic diagram of the electric drive system provided in an embodiment of this application, Figure 2 is a cross-sectional view of the electric drive system provided in an embodiment of this application, and Figure 3 is a partial view of position A in Figure 2.

[0052] As shown in Figures 1 to 3, this application embodiment provides an electric drive system 10, which includes a housing 100, a motor assembly 200, and a reducer assembly 300. The housing 100 has a receiving cavity 101, in which the motor assembly 200 and the reducer assembly 300 are both disposed. The housing 101 serves to install and fix the motor assembly 200 and the reducer assembly 300, and when the motor assembly 200 and the reducer assembly 300 are disposed within the receiving cavity 101, the inner wall of the housing 100 supports the motor assembly 200 and the reducer assembly 300. When energized, the motor assembly 200 can output a rotational speed, and the power of the motor assembly 200 can be transmitted to the reducer assembly 300, which reduces the rotational speed of the motor assembly 200 before outputting the speed.

[0053] The reducer assembly 300 includes a center gear 310, a first planetary gear 320, a second planetary gear 330, a planetary carrier 340, an internal gear ring 350, and a differential 360. The motor assembly 200 includes a motor body 210 and an output shaft 220. The motor body 210 is configured to drive the output shaft 220 to rotate. The output shaft 220 is connected to the center gear 310, which meshes with the first planetary gear 320. The second planetary gear 330 meshes with the internal gear ring 350, which is connected to the housing 100. The first planetary gear 320 and the second planetary gear 330 are coaxially connected to the planetary carrier 340. The planetary carrier 340 is connected to the differential 360.

[0054] Understandably, when the motor is operating, the motor body 210 drives the output shaft 220 to rotate, which in turn drives the central gear 310 to rotate. The central gear 310, through meshing with the first planetary gear 320, drives the first planetary gear 320 to rotate. Since the first planetary gear 320 and the second planetary gear 330 are coaxially connected, the first planetary gear 320 can drive the second planetary gear 330 to rotate synchronously on its own axis and revolve synchronously around the internal gear ring 350. The first planetary gear 320 and the second planetary gear 330 are rotatably connected to the planetary carrier 340. When the first planetary gear 320 and the second planetary gear 330 revolve, the planetary carrier 340 rotates axially around the central gear 310 and transmits power to the differential 360.

[0055] It should be noted that in the electric drive system 10 provided in this application embodiment, by setting the first planetary gear 320 and the second planetary gear 330 coaxially connected to cooperate with the center gear 310 and the differential 360 respectively, a double planetary gear structure is formed. The power output from the motor output shaft 220 to the center gear 310 is transmitted to the differential 360 through the revolution of the planetary carrier 340. Since the differential 360 is connected to the planetary carrier 340, the differential 360 can be arranged at the center of the reducer assembly 300 without being eccentrically set relative to the output shaft 220 of the motor assembly 200. While realizing the deceleration and power transmission of the reducer assembly 300, the space occupied by the reducer assembly 300 is reduced, and the volume and weight of the electric drive system 10 are reduced.

[0056] The following section will first provide a detailed explanation of the specific connection structure between the planetary support 340 and the differential 360.

[0057] Figure 4 is a structural schematic diagram of the reducer assembly in the electric drive system provided in the embodiment of this application; Figure 5 is a front view of the reducer assembly in the electric drive system provided in the embodiment of this application; and Figure 6 is an exploded view of the reducer assembly and drive shaft in the electric drive system provided in the embodiment of this application.

[0058] Referring to Figures 4 to 6, and in conjunction with Figures 2 and 3, in one possible implementation, the differential 360 may include a differential housing 363, a first differential gear 361, and a second differential gear 362. The planetary carrier 340 may be connected to the differential housing 363. The first differential gear 361 is connected to the differential housing 363, and the second differential gear 362 meshes with the first differential gear 361. The second differential gear 362 may be coaxially arranged with the output shaft 220.

[0059] It is understood that the output shaft 220, internal gear ring 350, planetary carrier 340, and differential housing 363 are all coaxially arranged. When the planetary carrier 340 rotates axially around the output shaft 220, it drives the differential housing 363 to rotate. The differential housing 363 drives the first differential gear 361 to revolve axially around the internal gear ring 350, so that the first differential gear 361 drives the second differential gear 362 to rotate. The second differential gear 362 rotates on its own axis and can output power to the outside of the electric drive system 10.

[0060] It should be noted that, since the differential housing 363 is connected to the planetary support 340, the differential housing 363 can be located in the middle of the reducer assembly 300. The differential 360 can utilize the axial space of the reducer assembly 300 without having to be arranged on the side of the reducer gear, thereby reducing the space occupied by the reducer assembly 300 in the receiving cavity 101.

[0061] In some embodiments, the planetary carrier 340 may include a carrier body 341 and a connecting portion 342. The carrier body 341 is located on the side of the first planetary gear 320 facing the motor assembly 200. A first end of the connecting portion 342 is connected to the carrier body 341, and a second end of the connecting portion 342 is connected to the differential housing 363. In this way, the planetary carrier 340 and the differential housing 100 can be installed and positioned simultaneously, improving assembly convenience.

[0062] The output shaft 220 is defined as the X direction. The reducer assembly 300 is located at the end of the motor assembly 200 along the X direction. The axes of the first planetary gear, the second planetary gear, the center gear 310, the differential housing 363, and the planetary support 340 are all parallel to the X direction.

[0063] The support body 341 can be annular, and the support body 341 and the differential housing 363 can be arranged at intervals along the X direction. The first planetary gear 320 and the second planetary gear 330 can be disposed between the support body 341 and the differential housing 363, and the planetary support 340 can support the first planetary gear 320 and the second planetary gear 330. The connecting part 342 can be installed across the support body 341 and the differential housing 363.

[0064] For example, the connecting portion 342 extends in the X direction. The connecting portion 342 connects the bracket body 341 and the differential housing 363 to form a whole, so that the bracket body 341 and the differential housing 363 can rotate synchronously.

[0065] Please continue to refer to Figures 2 to 6. In some embodiments, the connecting part 342 can be located between two adjacent first planetary gears 320. The gap between the first planetary gears 320 can be used to reduce the axial dimension of the entire reducer assembly 300, reduce space occupation, and improve space utilization.

[0066] For example, there can be multiple connecting portions 342, which can be arranged circumferentially around the support body 341. Multiple connecting portions 342 can improve the connection reliability and structural strength between the support body 341 and the differential housing 363. The number of connecting portions 342 can be one, two, three or more, and this application embodiment does not specifically limit this.

[0067] Please refer to Figures 2 through 6. In some embodiments, the housing 100 has a partition wall 110 that divides the receiving cavity 101 into a motor compartment 101a and a reducer compartment 101b. The motor body 210 is located in the motor compartment 101a, and the reducer assembly 300 is located in the reducer compartment 101b. Lubricating oil is injected into the reducer compartment 101b to lubricate the internal gear ring 350, the first planetary gear 320, the second planetary gear 330, and the central gear 310 of the reducer. The reducer compartment 101b and the motor compartment 101a are relatively isolated to prevent lubricating oil from entering the motor compartment 101a and affecting the working environment of the motor assembly 200.

[0068] The isolation wall 110 has a connecting hole 111 through which the output shaft 220 passes and extends from the motor compartment 101a to the reducer compartment 101b, coaxially connected to the center wheel 310. A first bearing 120 is provided in the connecting hole 111, and at least part of the support body 341 is located inside the first bearing 120 and abuts against the inner ring of the first bearing 120, which can improve the support reliability of the planetary support 340 and the differential 360.

[0069] Understandably, the outer ring of the first bearing 120 can be interference-fitted with the inner wall of the connecting hole 111, and the inner ring of the first bearing 120 can be interference-fitted with the circumferential outer wall of the support body 341. The first bearing 120 provides support for the planetary support 340, which is connected to the differential housing 363 to form a whole. Therefore, the first bearing 120 can provide support for the whole formed by the planetary support 340 and the differential housing 363.

[0070] In addition, a second bearing 130 may be provided at the end of the differential housing 363 away from the planetary carrier 340. The second bearing 130 cooperates with the end output hole of the housing 100, so that the first bearing 120 and the second bearing 130 are respectively supported at both ends of the integral structure formed by the planetary carrier 340 and the differential housing 363, thereby improving the stability and smoothness of the overall rotation of the planetary carrier 340 and the differential housing 363.

[0071] For example, the planetary support 340 and the differential housing 363 can be integrally molded, thereby simplifying assembly steps and reducing production costs. For instance, the planetary support 340 and the differential housing 363 can be made of metals or alloys such as iron and aluminum. The planetary support 340 and the differential housing 363 can be integrally cast, or they can be welded together. The specific material type and molding method of the planetary support 340 and the differential housing 363 in this application embodiment are not limited.

[0072] Please refer to Figures 2 through 6. In some embodiments, there may be multiple first differential gears 361 and two second differential gears 362. The multiple first differential gears 361 are circumferentially spaced around the rotation axis of the differential housing 363. The two second differential gears 362 are spaced apart along the length of the output shaft 220. Each second differential gear 362 meshes with multiple second differential gears 362 simultaneously, which can achieve reliable power differential output.

[0073] Understandably, the two second differential gears 362 can respectively transmit power to the output half-shafts on both sides outside the electric drive system 10, so that when the electric drive system 10 is applied to a vehicle, the power can be differentially output to the wheels on both sides through the differential 360.

[0074] For example, both the second differential gear 362 and the first differential gear 361 can be bevel gears. The axial direction of the first differential gear 361 is perpendicular to the rotational axial direction of the output shaft 220, that is, the first differential gear 361 can be perpendicular to the X direction, and the second differential gear 362 is coaxially arranged with the output shaft 220.

[0075] Please refer to Figures 2 through 6. As an optional embodiment, the electric drive system 10 may further include a drive shaft 400, an output shaft 220 having a through hole 221, through which the drive shaft 400 passes. The drive shaft 400 is connected to one of the two second differential gears 362, the one closer to the motor assembly 200. The power output by the differential 360 can be transmitted to the end of the electric drive assembly away from the reducer assembly 300.

[0076] For example, there are two second differential gears 362 and two first differential gears 361, with each second differential gear 362 simultaneously meshing with one of the two first differential gears 361. When the electric drive system 10 is applied to a vehicle, the vehicle has two output half-shafts. One of the two second differential gears 362 is connected to the drive shaft 400 and transmits power to one end of the output half-shaft of the electric drive system 10 via the drive shaft 400. The other of the two second differential gears 362 can directly transmit power to the other output half-shaft. When the vehicle is turning, there is a speed difference between the two sides of the vehicle. The differential output of the two second differential gears 362 can be achieved by rotating the two first differential gears 361.

[0077] In some embodiments, the diameter of the first planetary gear 320 is larger than the diameter of the second planetary gear 330, and the first planetary gear 320 is located on the side of the internal gear ring 350 facing the motor assembly 200, thereby improving the compactness of the planetary gear layout of the reducer assembly 300 and improving space utilization.

[0078] The first planetary gear 320 and the second planetary gear 330 are coaxially fixedly connected. The first planetary gear 320 and the second planetary gear 330 can be simultaneously mounted on the gear shaft and rotatably connected to the planetary support 340 through the gear shaft.

[0079] In some embodiments, a first limiting baffle 343 is provided on the circumferential outer side of the planetary carrier 340, and a second limiting baffle 3631 is provided on the circumferential outer side of the differential 360 assembly. The first limiting baffle 343 is positioned on the side of the first planetary gear opposite to the second planetary gear, and the second limiting baffle 3631 is positioned on the side of the second planetary gear opposite to the first planetary gear, thereby improving the installation reliability and stability of the first planetary gear 320 and the second planetary gear 330.

[0080] For example, the first limiting plate can be integrally formed with the planetary support 340. The second limiting baffle 3631 can be integrally formed with the differential housing 363.

[0081] In some embodiments, there are multiple first planetary gears 320 and multiple second planetary gears 330. The multiple first planetary gears 320 are arranged at intervals around the central gear 310, and the multiple second planetary gears 330 are connected to the multiple first planetary gears 320 in a one-to-one correspondence. This can improve the transmission reliability of the reducer assembly 300 and ensure good transmission efficiency and transmission accuracy.

[0082] In this configuration, multiple second planetary gears 330 are circumferentially spaced around the internal gear ring 350, and the central gear 310 simultaneously meshes with multiple first planetary gears. For example, the number of first planetary gears 320 and second planetary gears 330 can be two, three, four, or more; this embodiment does not specifically limit the number.

[0083] This application also provides a vehicle that may include the electric drive system 10 described above. The vehicle provided in this application can be a new energy vehicle, including but not limited to pure electric vehicles, hybrid electric vehicles, and hydrogen fuel cell vehicles; this application does not specifically limit its application to these categories.

[0084] The vehicle provided in this application embodiment has all the technical solutions and effects of the aforementioned electric drive system 10, which will not be repeated here.

[0085] This application provides an electric drive system 10, which includes a housing 100, a motor assembly 200, and a reducer assembly 300. The housing 100 has a receiving cavity 101, in which the motor assembly 200 and the reducer assembly 300 are both disposed. The reducer assembly 300 includes a center gear 310, a first planetary gear 320, a second planetary gear 330, a planetary carrier 340, an internal gear ring 350, and a differential 360. The motor assembly 200 includes a motor body 210 and an output shaft 220, with the motor body 210 configured to drive the output shaft 220 to rotate. The output shaft 220 is connected to the center gear 310. The central gear 310 meshes with the first planetary gear 320; the second planetary gear 330 meshes with the internal gear ring 350; the internal gear ring 350 is connected to the housing 100; the first planetary gear 320 and the second planetary gear 330 are coaxially connected to the planetary carrier 340; the planetary carrier 340 is connected to the differential 360, thus forming a double planetary gear structure. The power output from the motor output shaft 220 to the central gear 310 is transmitted to the differential 360 through the revolution of the planetary carrier 340, thereby realizing the reduction of the speed reducer assembly 300 and the power transmission, reducing the space occupied by the speed reducer assembly 300, and reducing the volume and weight of the electric drive system 10.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An electric drive system, comprising a housing, a motor assembly, and a reducer assembly; the housing having a receiving cavity, wherein the motor assembly and the reducer assembly are both disposed within the receiving cavity; The reducer assembly includes a center gear, a first planetary gear, a second planetary gear, a planetary carrier, an internal gear ring, and a differential; the motor assembly includes a motor body and an output shaft, the motor body being configured to drive the output shaft to rotate; the output shaft is connected to the center gear; the center gear meshes with the first planetary gear; the second planetary gear meshes with the internal gear ring; the internal gear ring is connected to the housing; the first planetary gear and the second planetary gear are coaxially connected to the planetary carrier; the planetary carrier is connected to the differential.

2. The electric drive system according to claim 1, wherein the differential includes a differential housing, a first differential gear and a second differential gear, the planetary carrier is connected to the differential housing, and the first differential gear is connected to the differential housing; The second differential gear meshes with the first differential gear; The second differential gear is coaxially arranged with the output shaft.

3. The electric drive system according to claim 2, wherein the planetary carrier includes a carrier body and a connecting portion, the carrier body being located on the side of the first planetary gear facing the motor assembly; a first end of the connecting portion is connected to the carrier body, and a second end of the connecting portion is connected to the differential housing.

4. The electric drive system according to claim 3, wherein the connecting portion is located between two adjacent first planetary gears.

5. The electric drive system according to claim 3, wherein the housing has a partition wall that divides the receiving cavity into a motor compartment and a reducer compartment, the motor body is located in the motor compartment, and the reducer assembly is located in the reducer compartment; The isolation wall has a connecting hole, through which the output shaft passes and extends from the motor compartment to the reducer compartment; a first bearing is provided in the connecting hole, and at least a portion of the main body of the bracket is located inside the first bearing and abuts against the inner ring of the first bearing.

6. The electric drive system according to claim 2, wherein the planetary support and the differential housing are integrally formed.

7. The electric drive system according to any one of claims 2-6, wherein there are multiple first differential gears and two second differential gears, the multiple first differential gears are circumferentially spaced around the rotation axis of the differential housing; the two second differential gears are spaced along the length direction of the output shaft; each second differential gear simultaneously meshes with multiple second differential gears.

8. The electric drive system according to claim 7, the electric drive system further comprising a drive shaft, the output shaft having a through hole, the drive shaft passing through the through hole, and the drive shaft being connected to the second differential gear of the two second differential gears on the side closer to the motor assembly.

9. The electric drive system according to any one of claims 1-6, wherein the diameter of the first planetary gear is greater than the diameter of the second planetary gear; the first planetary gear is located on the side of the internal gear ring facing the motor assembly.

10. The electric drive system according to claim 9, wherein a first limiting baffle is provided on the circumferential outer side of the planetary carrier, and a second limiting baffle is provided on the circumferential outer side of the differential; the first limiting baffle is disposed on the side of the first planetary gear away from the second planetary gear, and the second limiting baffle is disposed on the side of the second planetary gear away from the first planetary gear.

11. The electric drive system according to any one of claims 1-6, wherein there are multiple first planetary gears and multiple second planetary gears, and the multiple first planetary gears are arranged at intervals around the central gear; the multiple second planetary gears are connected to the multiple first planetary gears in a one-to-one correspondence.

12. A vehicle comprising the electric drive system according to any one of claims 1-11.

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