Electric drive system and vehicle

Abstract

The invention provides an electric drive system and a vehicle, and relates to the technical field of electric drive. The electric drive system comprises a shell, a motor assembly and a speed reducer assembly. The shell is provided with a containing cavity, the motor assembly and the speed reducer assembly are both arranged in the containing cavity, and the speed reducer assembly comprises a center wheel, a first planet wheel, a second planet wheel, a planet support, an inner gear ring and a differential mechanism. The motor assembly comprises a motor main body and an output shaft, and the motor main body is configured to drive the output shaft to rotate; the output shaft is connected with the center wheel; the center wheel is meshed with the first planet wheel; the second planet gear is meshed with the inner gear ring; the inner gear ring is connected with the shell; the first planet gear and the second planet gear are coaxially connected to the planet support. The planet support is connected with the differential mechanism, so that a duplex planet row structure is formed, space occupation of the speed reducer assembly is reduced, and the size and the weight of an electric drive system are reduced.

Description

Technical Field

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

[0002] With the rapid popularization of new energy vehicles, electric drive systems are rapidly developing towards high power density, low cost, high integration and high efficiency. Under this trend, high power density requires the motor to be high in power and compact in size.

[0003] In the related art, 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 decelerated and output power is output through the reducer. The reducer includes multiple gears, which are meshed in sequence to perform multi-stage deceleration and transmit power. The two meshing gears of each stage are arranged radially along the gear.

[0004] However, the reducer in the current electric drive system occupies a large space, resulting in a large overall size and weight of the electric drive system. Summary of the invention

[0005] The present application provides an electric drive system and a vehicle to solve the technical problem that the reducer in the current electric drive system occupies a large space, resulting in a large overall size and weight of the electric drive system.

[0006] In a first aspect, the present 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 arranged in the receiving cavity.

[0007] Among them, the reducer assembly includes a center wheel, a first planetary wheel, a second planetary wheel, a planetary carrier, an inner ring gear and a differential; the motor assembly includes a motor body and an output shaft, and the motor body is configured to drive the output shaft to rotate; the output shaft is connected to the center wheel; the center wheel is meshed with the first planetary wheel; the second planetary wheel is meshed with the inner ring gear; the inner ring gear is connected to the housing; the first planetary wheel and the second planetary wheel are coaxially connected to the planetary carrier; the planetary carrier is connected to the differential.

[0008] The electric drive system provided by the present application forms a double planetary gear structure by arranging two coaxially connected planetary gears to cooperate with the center wheel and the differential respectively, so as to transmit the power output from the motor output shaft to the center wheel to the differential through the revolution of the planetary bracket, thereby realizing the deceleration and power transmission of the reducer assembly, reducing the space occupied by the reducer assembly, and reducing the volume and weight of the electric drive system.

[0009] As an optional embodiment, the differential may include a differential housing, a first differential gear and a second differential gear, the planetary carrier may be connected to the differential housing, the first differential gear may be connected to the differential housing; the second differential gear may be meshed with the first differential gear; and the second differential gear may be coaxially arranged with the output shaft.

[0010] With such an arrangement, the differential can utilize the axial space of the reducer assembly without being arranged on the side of the reducer gear, thereby reducing the space occupied by the reducer assembly in the accommodating cavity.

[0011] As an optional embodiment, the planetary bracket may include a bracket body and a connecting portion, wherein the bracket body is located on the side of the first planetary gear facing the motor assembly; the first end of the connecting portion is connected to the bracket body, and the second end of the connecting portion is connected to the differential housing.

[0012] With such an arrangement, the planetary carrier can be installed and positioned simultaneously with the differential housing, thereby improving assembly convenience.

[0013] As an optional implementation, the connecting portion may be located between two adjacent first planetary gears.

[0014] With such an arrangement, the gap between the first planetary gears can be utilized to reduce the axial size of the entire reducer assembly, reduce space occupancy, and improve space utilization.

[0015] As an optional embodiment, the shell has a partition wall, which divides the accommodating 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.

[0016] Among them, the isolation wall has a connecting hole, the output shaft is passed through the connecting hole, 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 structure of the bracket body is located on the inner side of the first bearing and abuts against the inner ring of the first bearing.

[0017] Such an arrangement can improve the support reliability of the planetary carrier and the differential.

[0018] As an optional implementation, the planet carrier and the differential housing may be an integrally formed part.

[0019] Such an arrangement can simplify the assembly steps and reduce production costs.

[0020] As an optional embodiment, there can be multiple first differential gears and two second differential gears, and 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; and each second differential gear is meshed with multiple second differential gears at the same time.

[0021] Such an arrangement can achieve reliability of power differential output.

[0022] As an optional embodiment, the electric drive system may further include a transmission shaft, the output shaft having a through hole, the transmission shaft passing through the through hole, and the transmission shaft being connected to the second differential gear on the side close to the motor assembly of the two second differential gears.

[0023] With such an arrangement, the power output by the differential can be transmitted to the end of the electric drive assembly that is away from the reducer assembly.

[0024] As an optional implementation, 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 inner gear ring facing the motor assembly.

[0025] Such an arrangement can improve the compactness of the planetary gear layout of the reducer assembly and improve space utilization.

[0026] As an optional embodiment, a first limit baffle is provided on the circumferential outer side of the planetary bracket, and a second limit baffle is provided on the circumferential outer side of the differential; the first limit baffle is provided on the side of the first planetary gear away from the second planetary gear, and the second limit baffle is provided on the side of the second planetary gear away from the first planetary gear.

[0027] Such an arrangement can improve the installation reliability and stability of the first planetary gear and the second planetary gear.

[0028] As an optional implementation, 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; and the multiple second planetary gears are connected to the multiple first planetary gears in a one-to-one correspondence.

[0029] Such an arrangement can improve the transmission reliability of the reducer assembly and ensure good transmission efficiency and transmission accuracy.

[0030] In a second aspect, the present application provides a vehicle comprising the electric drive system in the above technical solution.

[0031] The present application provides an electric drive system and a vehicle, the electric drive system comprising a housing, a motor assembly and a reducer assembly; the housing has a accommodating cavity, the motor assembly and the reducer assembly are both arranged in the accommodating cavity, the reducer assembly comprises a center wheel, a first planetary wheel, a second planetary wheel, a planetary bracket, an inner ring gear and a differential; the motor assembly comprises 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 wheel; the center wheel meshes with the first planetary wheel; the second planetary wheel meshes with the inner ring gear; the inner ring gear is connected to the housing; the first planetary wheel and the second planetary wheel are coaxially connected to the planetary bracket; the planetary bracket is connected to the differential, thereby forming a double planetary gear structure, and the power output from the motor output shaft to the center wheel is transmitted to the differential through the revolution of the planetary bracket, thereby realizing deceleration and power transmission of the reducer assembly, reducing the space occupied by the reducer assembly, and reducing the volume and weight of the electric drive system.

[0032] In addition to the technical problems solved by the embodiments of the present application described above, the technical features that constitute the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions, other technical problems that can be solved by the electric drive system and vehicle provided by the present application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 A schematic diagram of the structure of the electric drive system provided in an embodiment of the present application;

[0035] Figure 2 A cross-sectional view of an electric drive system provided in an embodiment of the present application;

[0036] Figure 3 for Figure 2 Partial view of position A in the middle;

[0037] Figure 4 A schematic diagram of the structure of a reducer assembly in an electric drive system provided in an embodiment of the present application;

[0038] Figure 5 A front view of a reducer assembly in an electric drive system provided in an embodiment of the present application;

[0039] Figure 6 An exploded diagram of the reducer assembly and the drive shaft in the electric drive system provided in an embodiment of the present application.

[0040] Description of reference numerals:

[0041] 10-Electric drive system;

[0042] 100-housing; 101-accommodating chamber; 101a-motor compartment; 101b-reducer compartment; 110-separation wall; 111-communication hole; 120-first bearing; 130-second bearing;

[0043] 200-motor assembly; 210-motor body; 220-output shaft; 221-through hole;

[0044] 300-reducer assembly; 310-center wheel; 320-first planetary gear; 330-second planetary gear; 340-planetary bracket; 341-bracket body; 342-connecting part; 343-first limit baffle; 350-inner gear ring; 360-differential; 361-first differential gear; 362-second differential gear; 363-differential housing; 3631-second limit baffle;

[0045] 400-Drive shaft. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0047] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the present application and are not intended to limit the scope of protection of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0048] Secondly, it should be noted that in the description of the present application, terms such as "front", "rear", "left", "right", "up", "down", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present application.

[0049] In addition, it should be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0050] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" 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 disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0051] At present, the electric drive system of new energy vehicles is developing rapidly in the direction of high power density, low cost, high integration and high efficiency. Under this trend, high power density requires the motor to be high power and compact. 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 and output power is output through the reducer. The reducer includes a plurality of gears, which mesh with each other in sequence, perform multi-stage reduction and transmit power. The two meshing gears of each stage are arranged radially along the gears to form a parallel shaft gear transmission structure. The plurality of reduction gears finally transmit the power to the differential on the side of the reducer, and the differential outputs the power to the half-axle of the vehicle.

[0052] However, in the current electric drive system, the parallel shaft reducer occupies a large space, and the differential is arranged on the side, so that the electric drive housing needs to protrude a part of the structure at the reducer end to accommodate the differential and radially arranged reducer gears, resulting in the overall large size and weight of the electric drive system. When applied to a vehicle, it will occupy a large space on the vehicle chassis, which limits the layout space of other components on the vehicle.

[0053] In response to the above-mentioned problems, an embodiment of the present application provides an electric drive system and a vehicle, by providing two coaxially connected planetary gears that respectively cooperate with the center wheel and the differential to form a double planetary gear structure, so that the power output from the motor output shaft to the center wheel is transmitted to the differential through the revolution of the planetary bracket, thereby reducing the space occupied by the reducer assembly and reducing the volume and weight of the electric drive system.

[0054] The technical solution of the present application will be described in detail below through specific embodiments.

[0055] Figure 1 A schematic diagram of the structure of the electric drive system provided in an embodiment of the present application, Figure 2 A cross-sectional view of an electric drive system provided in an embodiment of the present application, Figure 3 for Figure 2 Partial view of position A in the middle.

[0056] like Figures 1 to 3 As shown, an embodiment of the present 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 chamber 101, and the motor assembly 200 and the reducer assembly 300 are both arranged in the receiving chamber 101, which can play a role in installing and fixing the motor assembly 200 and the reducer assembly 300, and when the motor assembly 200 and the reducer assembly 300 are arranged in the receiving chamber 101, the inner wall of the housing 100 supports the motor assembly 200 and the reducer assembly 300. The motor assembly 200 can output a rotation speed after being energized, and the power of the motor assembly 200 can be transmitted to the reducer assembly 300, and the reducer assembly 300 is used to reduce the rotation speed of the motor assembly 200 and then output it.

[0057] The reducer assembly 300 includes a center wheel 310, a first planetary wheel 320, a second planetary wheel 330, a planetary carrier 340, an inner 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 wheel 310, the center wheel 310 is meshed with the first planetary wheel 320, the second planetary wheel 330 is meshed with the inner gear ring 350, the inner gear ring 350 is connected to the housing 100, and the first planetary wheel 320 and the second planetary wheel 330 are coaxially connected to the planetary carrier 340. The planetary carrier 340 is connected to the differential 360.

[0058] It is understandable that when the motor is working, the motor body 210 drives the output shaft 220 to rotate, the output shaft 220 drives the center wheel 310 to rotate, and the center wheel 310 drives the first planetary gear 320 to rotate by meshing with the first planetary gear 320. 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 and revolve around the inner ring gear 350 synchronously. 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 around the axial direction of the center wheel 310 and transmits power to the differential 360.

[0059] It should be noted that in the electric drive system 10 provided in the embodiment of the present application, a coaxially connected first planetary gear 320 and a second planetary gear 330 are respectively arranged to cooperate with the center wheel 310 and the differential 360, thereby forming a double planetary gear structure, and the power output from the motor output shaft 220 to the center wheel 310 is transmitted to the differential 360 through the revolution of the planetary bracket 340. Since the differential 360 is connected to the planetary bracket 340, the differential 360 can be arranged at the center position of the reducer assembly 300 without being eccentrically arranged relative to the output shaft 220 of the motor assembly 200. While achieving the deceleration and power transmission of the reducer assembly 300, the space occupancy of the reducer assembly 300 is reduced, and the volume and weight of the electric drive system 10 are reduced.

[0060] First, the specific connection structure between the planetary carrier 340 and the differential 360 will be described in detail below.

[0061] Figure 4 This is a schematic diagram of the structure of a reducer assembly in an electric drive system provided in an embodiment of the present application. Figure 5 A front view of a reducer assembly in an electric drive system provided in an embodiment of the present application. Figure 6 An exploded diagram of the reducer assembly and the drive shaft in the electric drive system provided in an embodiment of the present application.

[0062] Please refer to Figures 4 to 6 , and combined with Figure 2 and Figure 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, the second differential gear 362 is meshed with the first differential gear 361, and the second differential gear 362 may be coaxially arranged with the output shaft 220.

[0063] It can be understood that the output shaft 220, the inner gear ring 350, the planetary carrier 340 and the differential housing 363 are all coaxially arranged. When the planetary carrier 340 rotates around the axial direction of the output shaft 220, the differential housing 363 is driven to rotate, and the differential housing 363 drives the first differential gear 361 to revolve around the axial direction of the inner gear ring 350, so that the first differential gear 361 drives the second differential gear 362 to rotate, and the second differential gear 362 rotates, and the second differential gear 362 can output power to the outside of the electric drive system 10.

[0064] It should be noted that, since the differential housing 363 is connected to the planetary bracket 340, the differential housing 363 can be located in the middle position of the reducer assembly 300, and the differential 360 can utilize the axial space of the reducer assembly 300 without being arranged on the side of the reducer gear, thereby reducing the space occupied by the reducer assembly 300 in the accommodating cavity 101.

[0065] In some embodiments, the planetary bracket 340 may include a bracket body 341 and a connecting portion 342, wherein the bracket body 341 is located on the side of the first planetary gear 320 facing the motor assembly 200. The first end of the connecting portion 342 is connected to the bracket body 341, and the second end of the connecting portion 342 is connected to the differential housing 363, so that the planetary bracket 340 can be installed and positioned simultaneously with the differential housing 100, thereby improving assembly convenience.

[0066] The axial direction of 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, and the axial directions of the first planetary gear, the second planetary gear, the center gear 310, the differential housing 363, and the planetary bracket 340 are all parallel to the X direction.

[0067] The bracket body 341 may be annular, the bracket body 341 and the differential housing 363 may be arranged at intervals along the X direction, the first planetary gear 320 and the second planetary gear 330 may be arranged between the bracket body 341 and the differential housing 363, and the planetary bracket 340 may play a role in supporting the first planetary gear 320 and the second planetary gear 330. The connecting portion 342 may be straddled and connected between the bracket body 341 and the differential housing 363.

[0068] Exemplarily, the connection portion 342 extends along the X direction. The connection portion 342 connects the support body 341 and the differential housing 363 to form a whole, so that the support body 341 and the differential housing 363 can rotate synchronously.

[0069] Please continue to refer to Figures 2 to 6 In some embodiments, the connecting portion 342 may be located between two adjacent first planetary gears 320 , and the gap between the first planetary gears 320 may be utilized to reduce the axial size of the entire reducer assembly 300 , reduce space occupancy, and improve space utilization.

[0070] Exemplarily, there may be a plurality of connection parts 342, and the plurality of connection parts 342 may be arranged at intervals around the circumference of the bracket body 341, and the plurality of connection parts 342 may improve the connection reliability and structural strength between the bracket body 341 and the differential housing 363. The number of connection parts 342 may be one, two, three or more, and this embodiment of the application does not specifically limit this.

[0071] Please continue to refer to Figures 2 to 6In some embodiments, the housing 100 has a partition wall 110, which divides the accommodating chamber 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 inner gear ring 350, the first planetary gear 320, the second planetary gear 330, and the center wheel 310 of the reducer. The reducer compartment 101b and the motor compartment 101a are relatively isolated to prevent the lubricating oil from entering the motor compartment 101a and affecting the working environment of the motor assembly 200.

[0072] The partition wall 110 has a connecting hole 111, and the output shaft 220 is passed through the connecting hole 111, and extends from the motor compartment 101a to the reducer compartment 101b and is coaxially connected to the center wheel 310. The connecting hole 111 is provided with a first bearing 120, and at least part of the structure of the bracket body 341 is located on the inner side of the first bearing 120 and abuts against the inner ring of the first bearing 120, which can improve the support reliability of the planetary bracket 340 and the differential 360.

[0073] It can be understood that the outer ring of the first bearing 120 can be interference fit with the inner wall of the connecting hole 111, and the inner ring of the first bearing 120 can be interference fit with the circumferential outer wall of the bracket body 341. The first bearing 120 provides support for the planetary bracket 340, and the planetary bracket 340 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 bracket 340 and the differential housing 363.

[0074] In addition, a second bearing 130 may be provided at one end of the differential housing 363 away from the planetary carrier 340, and 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 overall 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.

[0075] Exemplarily, the planetary support 340 and the differential housing 363 may be an integrally formed part, thereby simplifying the assembly steps and reducing the production cost. For example, the planetary support 340 and the differential housing 363 may be made of metal or alloy such as iron or aluminum, and the planetary support 340 and the differential housing 363 may be integrally cast, or the planetary support 340 and the differential housing 363 may be welded. The specific material type and molding method of the planetary support 340 and the differential housing 363 in the embodiment of the present application are not limited.

[0076] Please continue to refer to Figures 2 to 6In some embodiments, there may be a plurality of first differential gears 361 and two second differential gears 362, and the plurality of first differential gears 361 are circumferentially spaced around the rotation axis of the differential housing 363. The two second differential gears 362 are spaced along the length direction of the output shaft 220. Each second differential gear 362 is meshed with a plurality of second differential gears 362 at the same time, so that the reliability of the power differential output can be achieved.

[0077] It can be understood that 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 differential can be output to the wheels on both sides through the differential 360.

[0078] Exemplarily, the second differential gear 362 and the first differential gear 361 can both be bevel gears. The axial direction of the first differential gear 361 is perpendicular to the rotational axis 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 .

[0079] Please continue to refer to Figures 2 to 6 As an optional embodiment, the electric drive system 10 may further include a transmission shaft 400. The output shaft 220 has a through hole 221. The transmission shaft 400 is inserted through the through hole 221. The transmission shaft 400 is connected to the second differential gear 362 of the two second differential gears 362, which is close 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.

[0080] Exemplarily, there are two second differential gears 362 and two first differential gears 361, and the two second differential gears 362 are respectively meshed with the two first differential gears 361 at the same time. 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 transmission shaft 400, and the power is transmitted to the output half shaft at one end of the electric drive system 10 through the transmission shaft 400, and the other of the two second differential gears 362 can directly transmit the power to the other output half shaft. When the vehicle is turning, there is a speed difference between the vehicles on both sides, and the differential output of the two second differential gears 362 can be achieved through the rotation of the two first differential gears 361.

[0081] In some embodiments, the diameter of the first planetary gear 320 is greater than the diameter of the second planetary gear 330, and the first planetary gear 320 is located on the side of the inner 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.

[0082] 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 sleeved on the gear shaft and rotatably connected to the planetary bracket 340 via the gear shaft.

[0083] In some embodiments, a first limiting baffle 343 is provided on the circumferential outer side of the planetary bracket 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 provided on the side of the first planetary gear away from the second planetary gear, and the second limiting baffle 3631 is provided on the side of the second planetary gear away from the first planetary gear, thereby improving the installation reliability and stability of the first planetary gear 320 and the second planetary gear 330.

[0084] For example, the first limit plate can be formed as an integral part with the planetary support 340. The second limit baffle 3631 can be formed as an integral part with the differential housing 363.

[0085] In some embodiments, there are multiple first planetary gears 320 and multiple second planetary gears 330, and the multiple first planetary gears 320 are arranged at intervals around the center wheel 310. The multiple second planetary gears 330 are connected to the multiple first planetary gears 320 in a one-to-one correspondence, thereby improving the transmission reliability of the reducer assembly 300 and ensuring good transmission efficiency and transmission accuracy.

[0086] The plurality of second planetary gears 330 are arranged at intervals around the inner gear ring 350, and the center gear 310 is meshed with the plurality of first planetary gears at the same time. For example, the number of the first planetary gears 320 and the second planetary gears 330 may be two, three, four or more, which is not specifically limited in the embodiment of the present application.

[0087] The embodiment of the present application also provides a vehicle, which may include the electric drive system 10 in the above technical solution. The vehicle provided in the embodiment of the present application may be a new energy vehicle, including but not limited to a pure electric vehicle, a hybrid electric vehicle, a hydrogen energy vehicle, etc., which is not specifically limited in the embodiment of the present application.

[0088] The vehicle provided in the embodiment of the present application has all the technical solutions and all the technical effects of the aforementioned electric drive system 10, which will not be repeated here.

[0089] The embodiment of the present 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 chamber 101, the motor assembly 200 and the reducer assembly 300 are both arranged in the receiving chamber 101, the reducer assembly 300 includes a center wheel 310, a first planetary wheel 320, a second planetary wheel 330, a planetary bracket 340, an inner ring gear 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 wheel 310 The center wheel 310 meshes with the first planetary wheel 320; the second planetary wheel 330 meshes with the inner gear ring 350; the inner gear ring 350 is connected to the housing 100; the first planetary wheel 320 and the second planetary wheel 330 are coaxially connected to the planetary carrier 340; the planetary carrier 340 is connected to the differential 360, thereby forming a double-linked planetary gear structure, and the power output from the motor output shaft 220 to the center wheel 310 is transmitted to the differential 360 through the revolution of the planetary carrier 340, thereby realizing the deceleration and power transmission of the reducer assembly 300, reducing the space occupied by the reducer assembly 300, and reducing the volume and weight of the electric drive system 10.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solution to deviate from the scope of the technical solution of the embodiments of the present application.

Claims

1. An electric drive system, characterized in that: It comprises 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 arranged in the receiving cavity; The reducer assembly includes a center wheel, a first planetary wheel, a second planetary wheel, a planetary carrier, an inner ring gear and a differential; the motor assembly includes a motor body and an output shaft, and the motor body is configured to drive the output shaft to rotate; the output shaft is connected to the center wheel; the center wheel is meshed with the first planetary wheel; the second planetary wheel is meshed with the inner ring gear; the inner ring gear is connected to the housing; the first planetary wheel and the second planetary wheel are coaxially connected to the planetary carrier; the planetary carrier is connected to the differential.

2. The electric drive system according to claim 1, characterized in that: The differential comprises a differential housing, a first differential gear and a second differential gear, the planet carrier is connected to the differential housing, the first differential gear is connected to the differential housing; the second differential gear is meshed 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, characterized in that: The planetary bracket includes a bracket body and a connecting portion, wherein the bracket body is located on the side of the first planetary gear facing the motor assembly; the first end of the connecting portion is connected to the bracket body, and the second end of the connecting portion is connected to the differential housing.

4. The electric drive system according to claim 3, characterized in that: The connecting portion is located between two adjacent first planetary gears.

5. The electric drive system according to claim 3, characterized in that: The housing has a partition wall, the partition wall divides the accommodating 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, the output shaft is passed through the connecting hole, 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 structure of the bracket body is located on the inner side of the first bearing and abuts against the inner ring of the first bearing.

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

7. The electric drive system according to any one of claims 2 to 6, characterized in that: There are multiple first differential gears and two second differential gears, and 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; and each second differential gear is meshed with multiple second differential gears at the same time.

8. The electric drive system according to claim 7, characterized in that: The electric drive system also includes a transmission shaft, the output shaft has a through hole, the transmission shaft is passed through the through hole, and the transmission shaft is connected to the second differential gear on the side close to the motor assembly among the two second differential gears.

9. The electric drive system according to any one of claims 1 to 6, characterized in that: The diameter of the first planetary gear is greater than the diameter of the second planetary gear; the first planetary gear is located on a side of the inner gear ring facing the motor assembly.

10. The electric drive system according to claim 9, characterized in that: A first limit baffle is provided on the circumferential outer side of the planetary bracket, and a second limit baffle is provided on the circumferential outer side of the differential; the first limit baffle is provided on the side of the first planetary gear away from the second planetary gear, and the second limit baffle is provided 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 to 6, characterized in that: There are multiple first planetary wheels and multiple second planetary wheels, and the multiple first planetary wheels are arranged around the center wheel at intervals; and the multiple second planetary wheels are connected to the multiple first planetary wheels in a one-to-one correspondence.

12. A vehicle, characterized in that: Comprising the electric drive system according to any one of claims 1-11.

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