Electric drive system and vehicle

Abstract

The utility model 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, the speed reducer assembly comprises a center wheel, a first planet wheel, a planet support and a differential mechanism, the motor assembly comprises a motor body, an output shaft and a first bearing, and the motor body is configured to drive the output shaft to rotate; the first bearing sleeves one end, facing the speed reducer assembly, of the output shaft; the output shaft is coaxially and fixedly connected with the center wheel; the center wheel is meshed with the first planet wheel, the center wheel and the first planet wheel are both helical gears, and the helical angle of the center wheel and the helical angle of the first planet wheel are larger than or equal to 20 degrees and smaller than or equal to 35 degrees, so that good reliability and high precision are guaranteed in the transmission process, the pressure of the speed reducer assembly on a motor shaft end bearing in the transmission process is reduced, and the transmission efficiency is improved. The service life of the bearing is prolonged.

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 high power and compact size of the motor.

[0003] In related technologies, the electric drive system of new energy vehicles generally integrates a motor and a reducer. The motor's output shaft cooperates with the reducer, reducing the rotation of the motor's output shaft through the reducer to output power. The reducer includes multiple gears that mesh sequentially to achieve multi-stage reduction and power transmission. Each stage consists of two meshing gears arranged radially along the gears.

[0004] However, the gears of the reducer in the current electric drive system are prone to axial play, and the axial pressure on the motor bearings during gear transmission is large, resulting in a reduced life of the motor bearings. Utility Model Content

[0005] The present application provides an electric drive system and a vehicle to solve the technical problems in the current electric drive system in which the gears of the reducer are prone to axial stringing and the axial pressure on the motor bearings during the gear transmission process is large, resulting in a reduced life of the motor bearings.

[0006] In the 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 accommodating cavity, and the motor assembly and the reducer assembly are both arranged in the accommodating cavity, the reducer assembly includes a center wheel, a first planetary wheel, a planetary bracket and a differential, the motor assembly includes a motor body, an output shaft and a first bearing, the motor body is configured to drive the output shaft to rotate, and the first bearing is sleeved on one end of the output shaft facing the reducer assembly; the output shaft is coaxially fixedly connected to the center wheel; the center wheel is meshed with the first planetary wheel; the first planetary wheel is rotatably connected to the planetary bracket; the planetary bracket is connected to the differential.

[0007] The central gear and the first planetary gear are both helical gears, and the helix angles of the central gear and the first planetary gear are equal, and the helix angle is greater than or equal to 20° and less than or equal to 35°.

[0008] The electric drive system provided in the present application utilizes a planetary gear structure for transmission and deceleration through the structural design of the reducer assembly. The center wheel and the first planetary wheel adopt a helical tooth structure to ensure that the transmission process has good reliability and high precision. At the same time, the helix angle of the center wheel and the first planetary wheel is controlled within a preset reasonable range, thereby reducing the pressure of the reducer assembly on the first bearing at the shaft end of the motor assembly during the transmission process, improving structural reliability, and extending the life of the first bearing.

[0009] As an optional implementation, the central gear and the first planet gear have opposite rotation directions.

[0010] As an optional embodiment, there are multiple first planetary gears, and the multiple first planetary gears are circumferentially spaced around the center gear; the center distance between the first planetary gears and the center gear is D, 50mm≤D≤70mm.

[0011] As an optional implementation manner, the pressure angles of the central gear and the first planetary gear are equal, and the pressure angle is greater than or equal to 15° and less than or equal to 20°.

[0012] As an optional implementation, the tooth width of the central gear is greater than the tooth width of the first planetary gears.

[0013] As an optional implementation, the tooth width of the central gear is d1, and the tooth width of the first planetary gear is d2, wherein 15 mm ≤ d2 < d1 ≤ 25 mm.

[0014] As an optional implementation, the number of teeth of the first planetary gear is greater than the number of teeth of the central gear.

[0015] As an optional embodiment, the reducer assembly may also include a second planetary gear and an inner ring gear; the first planetary gear is coaxially fixedly connected to the second planetary gear; the second planetary gear is meshed with the inner ring gear; the inner ring gear is connected to the housing; the first planetary gear is located on the side of the second planetary gear facing the motor assembly.

[0016] As an optional embodiment, the differential may include a differential housing, a first differential gear and a second differential gear, the planetary 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; and the second differential gear is coaxially arranged with the output shaft.

[0017] In a second aspect, the present application provides a vehicle comprising the electric drive system of any one of the above technical solutions.

[0018] The present application provides an electric drive system and a vehicle, wherein the electric drive system 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; the reducer assembly includes a central wheel, a first planetary wheel, a planetary carrier and a differential; the motor assembly includes a motor body, an output shaft and a first bearing; the motor body is configured to drive the output shaft to rotate, and the first bearing is sleeved on one end of the output shaft facing the reducer assembly; the output shaft is coaxially fixedly connected to the central wheel; the central wheel is meshed with the first planetary wheel; the first planetary wheel is rotatably connected to the planetary carrier; the planetary carrier is connected to the differential, the central wheel and the first planetary wheel are both helical gears, and the helix angles of the central wheel and the first planetary wheel are equal, the helix angles are greater than or equal to 20° and less than or equal to 35°, ensuring that the transmission process has good reliability and high precision, and at the same time, the helix angles of the central wheel and the first planetary wheel are controlled within a preset reasonable range, reducing the pressure of the reducer assembly on the motor shaft end bearing during the transmission process, improving structural reliability, and extending the life of the bearing.

[0019] 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

[0020] 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 any creative work.

[0021] Figure 1 A schematic diagram of the structure of the electric drive system provided in an embodiment of the present application;

[0022] Figure 2 A cross-sectional view of an electric drive system provided in an embodiment of the present application;

[0023] Figure 3 for Figure 2 Partial view of position A in the middle;

[0024] Figure 4 A schematic structural diagram of a reducer assembly in an electric drive system provided in an embodiment of the present application;

[0025] Figure 5 A front view of a reducer assembly in an electric drive system provided in an embodiment of the present application;

[0026] 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;

[0027] Figure 7 This is a schematic structural diagram of the first planetary gear of the reducer assembly in the electric drive system provided in an embodiment of the present application.

[0028] Description of reference numerals:

[0029] 10-Electric drive system;

[0030] 100 - housing; 101 - accommodating chamber; 101a - motor compartment; 101b - reducer compartment; 110 - partition wall; 111 - communicating hole; 120 - second bearing; 130 - third bearing;

[0031] 200 - motor assembly; 210 - motor body; 220 - output shaft; 221 - through hole; 230 - first bearing;

[0032] 300 - reducer assembly; 310 - center gear; 320 - first planetary gear; 330 - second planetary gear; 340 - planetary carrier; 341 - carrier body; 342 - connecting portion; 343 - first stopper; 350 - ring gear; 360 - differential; 361 - first differential gear; 362 - second differential gear; 363 - differential housing; 3631 - second stopper;

[0033] 400-Drive shaft. DETAILED DESCRIPTION

[0034] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0035] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of this application and are not intended to limit the scope of protection of this application. Those skilled in the art may adjust them as needed to suit specific applications.

[0036] Secondly, it should be noted that in the description of this application, terms such as "front", "back", "left", "right", "up", "down", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships 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, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on this application.

[0037] Furthermore, it should be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, electrical connections, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0038] Throughout this specification, reference to terms such as "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 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 any one or more embodiments or examples.

[0039] Currently, the electric drive systems of new energy vehicles are rapidly developing toward high power density, low cost, high integration, and high efficiency. This trend requires high power density and compact size. The electric drive systems of new energy vehicles generally integrate a motor and a reducer. The motor's output shaft cooperates with the reducer, reducing the rotation of the motor output shaft through the reducer to output power. The reducer includes multiple gears that mesh sequentially, performing multi-stage reduction and power transmission. The two intermeshing gears in each stage are arranged radially along the gears, forming a parallel axis gear transmission structure. The multiple reduction gears ultimately transmit the power to the differential on the side of the reducer, which then outputs the power to the vehicle's half-axles.

[0040] However, in current electric drive systems, parallel-axis reducers occupy a large space, and the differential is positioned to the side. This requires the electric drive housing to protrude slightly at the reducer end to accommodate the differential and radially arranged reducer gears, resulting in a large and heavy electric drive system. Furthermore, the reducer gears are prone to axial play, and the gear transmission process places significant axial pressure on the motor bearings, shortening their lifespan.

[0041] In response to the above problems, the embodiments of the present application provide an electric drive system and vehicle. Through the structural design of the reducer assembly, a planetary gear structure is used for transmission and deceleration. The center wheel and the planetary wheels adopt a helical tooth structure to ensure that the transmission process has good reliability and high precision. At the same time, the helix angle of the center wheel and the planetary wheels is controlled within a preset reasonable range, reducing the pressure of the reducer assembly on the bearing at the motor shaft end during the transmission process, improving the structural reliability and the life of the motor bearings.

[0042] The technical solution of this application will be described in detail below through specific embodiments.

[0043] Figure 1 This is 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 the electric drive system provided in an embodiment of the present application, Figure 3 for Figure 2 Partial view of position A in the middle, Figure 4 This is a schematic diagram of the structure of the reducer assembly in the electric drive system provided by an embodiment of the present application. Figure 5 This is a front view of the reducer assembly in the electric drive system provided by an embodiment of the present application. Figure 6 This is an exploded view of the reducer assembly and the drive shaft in the electric drive system provided by the embodiment of the present application. Figure 7 This is a schematic structural diagram of the first planetary gear of the reducer assembly in the electric drive system provided in an embodiment of the present application.

[0044] like Figures 1 to 7 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. 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 rotational speed after being energized, and the power of the motor assembly 200 can be transmitted to the reducer assembly 300. The reducer assembly 300 is used to reduce the rotational speed of the motor assembly 200 and output it.

[0045] Among them, the reducer assembly 300 includes a center wheel 310, a first planetary wheel 320, a planetary bracket 340 and a differential 360, and the motor assembly 200 includes a motor body 210, an output shaft 220 and a first bearing 230. The motor body 210 is configured to drive the output shaft 220 to rotate, and the first bearing 230 is sleeved on one end of the output shaft 220 facing the reducer assembly 300.

[0046] The output shaft 220 is coaxially fixedly connected to the center gear 310 . The center gear 310 is meshed with the first planetary gear 320 . The first planetary gear 320 is rotatably connected to the planetary carrier 340 . The planetary carrier 340 is connected to the differential 360 .

[0047] In some embodiments, the central gear 310 and the first planetary gears 320 are both helical gears, wherein the central gear 310 and the first planetary gears 320 have the same helix angle, which is greater than or equal to 20° and less than or equal to 35°.

[0048] The helix angle refers to the acute angle between the tangent of the helical gear indexing cylindrical helix and its axis. Since the center gear 310 and the first planetary gear 320 are helical gears, they have a greater overlap, which can improve meshing strength and transmission stability.

[0049] For example, the specific value α of the helix angle of the central gear 310 and the first planetary gears 320 can be 20°, 21°, 25°, 27°, 30°, 34°, 35°, etc., which is not specifically limited in the embodiments of the present application. For example, the helix angle of the central gear 310 and the first planetary gears 320 can both be 27°.

[0050] It should be noted that the electric drive system provided in the embodiment of the present application uses a planetary gear structure for transmission and deceleration through the structural design of the reducer assembly 300. The center wheel 310 and the first planetary wheel 320 adopt a helical tooth structure to ensure that the transmission process has good reliability and high precision. At the same time, the helix angle of the center wheel 310 and the first planetary wheel 320 is controlled within a preset reasonable range, thereby reducing the pressure of the reducer assembly 300 on the first bearing 230 at the shaft end of the motor assembly 200 during the transmission process, improving the structural reliability, and extending the life of the first bearing 230.

[0051] In some embodiments, the rotation directions of the center gear 310 and the first planet gears 320 are opposite. For example, when the rotation direction of the center gear 310 is counterclockwise, the rotation direction of the first planet gears 320 is clockwise; when the rotation direction of the center gear 310 is clockwise, the rotation direction of the first planet gears 320 is counterclockwise.

[0052] Exemplarily, the gear module of the central gear 310 and the first planetary gears 320 is 0.89 mm.

[0053] For example, the center gear 310 and the first planet gears 320 are externally meshed, and the addendum coefficients of the center gear 310 and the first planet gears 320 are both 1.39, and the addendum coefficients and the top clearance coefficients of the center gear 310 and the first planet gears 320 are both 0.3. The displacement coefficient of the center gear 310 is -0.05, and the displacement coefficient of the first planet gears 320 is -0.048.

[0054] In some embodiments, there are multiple first planetary gears 320 , which are circumferentially spaced around the center gear 310 ; the center distance between the first planetary gears 320 and the center gear 310 is D, 50 mm ≤ D ≤ 70 mm.

[0055] For example, the specific value of the center distance between the first planetary gear 320 and the center gear 310 can be 50mm, 51mm, 55mm, 58mm, 60mm, 62mm, 65mm, 69mm, 70mm, etc., which is not specifically limited in the embodiments of the present application.

[0056] In some embodiments, the pressure angles of the central gear 310 and the first planetary gears 320 are equal, and the pressure angle is greater than or equal to 15° and less than or equal to 20°.

[0057] The pressure angle refers to the angle between the involute motion direction of the gear and the force direction. The center gear 310 and the first planetary gear 320 in this application are the pitch circle pressure angles thereof.

[0058] For example, the pressure angles of the two pitch circles are equal, and the pressure angles can be 15°, 17°, 19°, 20°, etc., which is not specifically limited in the embodiments of the present application.

[0059] In some embodiments, the tooth width of the central gear 310 may be greater than the tooth width of the first planetary gears 320 .

[0060] It can be understood that the tooth width of the central gear 310 is d1, and the tooth width of the first planetary gear 320 is d2, wherein 15 mm ≤ d2 < d1 ≤ 25 mm.

[0061] For example, the tooth width of the center gear 310 may be 20 mm, 20.1 mm, 21 mm, 21.1 mm, 21.5 mm, 22 mm, 22.5 mm, 22.9 mm, 22 mm, etc. The tooth width of the first planetary gear 320 may be 18 mm, 18.1 mm, 19 mm, 19.1 mm, 19.5 mm, 19.9 mm, etc. This embodiment of the present application does not specifically limit this.

[0062] In some embodiments, the number of teeth on the first planetary gears 320 is greater than the number of teeth on the center gear 310 .

[0063] For example, the number of teeth of the central gear 310 may be 40, 41, 42, 44, 45, 8, 49, 50, etc. The number of teeth of the first planetary gear 320 may be 70, 71, 75, 80, 81, 85, 89, 90, etc., which is not specifically limited in the embodiment of the present application.

[0064] In one possible implementation, the reducer assembly 300 may further include a second planetary gear 330 and an inner ring gear 350. The second planetary gear 330 is meshed with the inner ring gear 350, and the inner ring gear 350 is connected to the housing 100. The first planetary gear 320 and the second planetary gear 330 are coaxially fixedly connected to the planetary carrier 340. The first planetary gear 320 is located on the side of the second planetary gear 330 facing the motor assembly 200.

[0065] It will be appreciated that when the motor is operating, the motor body 210 drives the output shaft 220 to rotate, which in turn drives the center gear 310 to rotate. The center gear 310, in turn, meshes with the first planetary gears 320, driving the first planetary gears 320 to rotate. Because the first and second planetary gears 320 and 330 are coaxially connected, the first planetary gears 320 can drive the second planetary gears 330 to rotate synchronously and revolve around the inner ring gear 350. The first and second planetary gears 320 and 330 are rotationally connected to the planetary carrier 340. As the first and second planetary gears 320 and 330 revolve, the planetary carrier 340 rotates axially around the center gear 310 and transmits power to the differential 360.

[0066] 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 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.

[0067] First, the specific connection structure between the planetary carrier 340 and the differential 360 will be described in detail below.

[0068] 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.

[0069] It is understood that the output shaft 220, the ring gear 350, the planetary carrier 340, and the differential housing 363 are all coaxially arranged. When the planetary carrier 340 rotates about the axial direction of the output shaft 220, it drives the differential housing 363 to rotate. The differential housing 363 drives the first differential gear 361 to revolve about the axial direction of the ring gear 350. The first differential gear 361 drives the second differential gear 362 to rotate, and the second differential gear 362 rotates. The second differential gear 362 can output power to the outside of the electric drive system 10.

[0070] 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.

[0071] 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 can be installed and positioned simultaneously with the differential housing 100, improving assembly convenience.

[0072] 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. 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.

[0073] The bracket body 341 may be annular, and the bracket body 341 and the differential housing 363 may be spaced apart along the X direction. The first planetary gears 320 and the second planetary gears 330 may be disposed between the bracket body 341 and the differential housing 363. The planetary bracket 340 may support the first planetary gears 320 and the second planetary gears 330. The connecting portion 342 may be disposed across and connected between the bracket body 341 and the differential housing 363.

[0074] Illustratively, the connecting portion 342 extends along 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.

[0075] Please continue to refer to Figures 2 to 6 In some embodiments, the connecting portion 342 can be located between two adjacent first planetary gears 320. The gap between the first planetary gears 320 can be utilized to reduce the axial size of the entire reducer assembly 300, reduce space occupancy, and improve space utilization.

[0076] For example, there may be multiple connecting portions 342, which may be spaced apart circumferentially around the bracket body 341. Multiple connecting portions 342 may improve the connection reliability and structural strength between the bracket body 341 and the differential case 363. The number of connecting portions 342 may be one, two, three, or more, and this is not specifically limited in this embodiment of the present application.

[0077] Please continue to refer to Figures 2 to 6 In some embodiments, the housing 100 has a partition wall 110, which separates 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 gear 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.

[0078] The partition wall 110 has a connecting hole 111, through which the output shaft 220 passes. The output shaft 220 extends from the motor compartment 101a to the reducer compartment 101b and is coaxially connected to the center gear 310. A second bearing 120 is positioned in the connecting hole 111, and the bracket body 341 abuts the inner ring of the second bearing 120, thereby improving the support reliability of the planetary bracket 340 and the differential 360.

[0079] It is understood that the outer ring of the second bearing 120 can have an interference fit with the inner wall of the communication hole 111, and the inner ring of the second bearing 120 can have an interference fit with the circumferential outer wall of the bracket body 341. The second bearing 120 provides support for the planetary carrier 340, which is connected to the differential housing 363 to form an integral unit. Therefore, the second bearing 120 can provide support for the integral unit formed by the planetary carrier 340 and the differential housing 363.

[0080] In addition, a third bearing 130 may be provided at one end of the differential housing 363 facing away from the planetary carrier 340, and the third bearing 130 cooperates with the end output hole of the housing 100, so that the second bearing 120 and the third 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.

[0081] Exemplarily, the planetary carrier 340 and the differential housing 363 can be integrally formed, thereby simplifying assembly steps and reducing production costs. For example, the planetary carrier 340 and the differential housing 363 can be made of a metal or alloy such as iron or aluminum. The planetary carrier 340 and the differential housing 363 can be integrally cast, or welded. The specific material type and molding method of the planetary carrier 340 and the differential housing 363 are not limited in this embodiment of the present application.

[0082] Please continue to refer to Figures 2 to 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 apart around the rotation axis of the differential housing 363. The two second differential gears are spaced apart along the length of the output shaft 220. Each second differential gear 362 simultaneously meshes with multiple second differential gears 362, thereby ensuring reliable power differential output.

[0083] 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.

[0084] For example, 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 rotation 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.

[0085] 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, through which the transmission shaft 400 passes. The transmission shaft 400 is connected to the second differential gear 362 on the side closest to the motor assembly 200. The power output of the differential 360 can be transmitted to the end of the electric drive assembly away from the reducer assembly 300.

[0086] Exemplarily, there are two second differential gears 362 and two first differential gears 361, and the two second differential gears 362 are simultaneously meshed with 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 the output half-shaft at one end 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 turns, there is a speed difference between the two sides of the vehicle. The rotation of the two first differential gears 361 can achieve a differential output of the two second differential gears 362.

[0087] 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.

[0088] 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 through the gear shaft.

[0089] In some embodiments, a first stopper plate 343 is provided on the circumferential outer side of the planetary carrier 340, and a second stopper plate 3631 is provided on the circumferential outer side of the differential assembly 360. The first stopper plate 343 is provided on the side of the first planetary gear facing away from the second planetary gear, and the second stopper plate 3631 is provided on the side of the second planetary gear facing 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.

[0090] For example, the first limiting plate can be formed as an integral part with the planetary carrier 340 . The second limiting baffle 3631 can be formed as an integral part with the differential housing 363 .

[0091] 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 gear 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.

[0092] The plurality of second planetary gears 330 are circumferentially spaced apart around the inner ring gear 350, and the center gear 310 is simultaneously meshed with the plurality of first planetary gears. For example, the number of first planetary gears 320 and second planetary gears 330 can be two, three, four, or more, and this is not specifically limited in the present embodiment.

[0093] The present invention also provides a vehicle that can include the electric drive system 10 of the above technical solution. The vehicle provided in the present invention can be a new energy vehicle, including but not limited to a pure electric vehicle, a hybrid electric vehicle, a hydrogen vehicle, etc., which is not specifically limited in the present invention.

[0094] 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.

[0095] The present application provides an electric drive system and a vehicle, wherein the electric drive system 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; the reducer assembly includes a central wheel, a first planetary wheel, a planetary carrier and a differential; the motor assembly includes a motor body, an output shaft and a first bearing; the motor body is configured to drive the output shaft to rotate, and the first bearing is sleeved on one end of the output shaft facing the reducer assembly; the output shaft is coaxially fixedly connected to the central wheel; the central wheel is meshed with the first planetary wheel; the first planetary wheel is rotatably connected to the planetary carrier; the planetary carrier is connected to the differential, the central wheel and the first planetary wheel are both helical gears, and the helix angles of the central wheel and the first planetary wheel are equal, the helix angles are greater than or equal to 20° and less than or equal to 35°, ensuring that the transmission process has good reliability and high precision, and at the same time, the helix angles of the central wheel and the first planetary wheel are controlled within a preset reasonable range, reducing the pressure of the reducer assembly on the motor shaft end bearing during the transmission process, improving structural reliability, and extending the life of the bearing.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An electric drive system (10), characterized in that: The invention comprises a housing (100), a motor assembly (200) and a reducer assembly (300); the housing (100) has a receiving cavity (101), and the motor assembly (200) and the reducer assembly (300) are both arranged in the receiving cavity (101); The reducer assembly (300) includes a center wheel (310), a first planetary wheel (320), a planetary carrier (340) and a differential (360); the motor assembly (200) includes a motor body (210), an output shaft (220) and a first bearing (230); the motor body (210) is configured to drive the output shaft (220) to rotate; the first bearing (230) is sleeved on one end of the output shaft (220) facing the reducer assembly (300); the output shaft (220) is coaxially fixedly connected to the center wheel (310); the center wheel (310) is meshed with the first planetary wheel (320); the first planetary wheel (320) is rotatably connected to the planetary carrier (340); and the planetary carrier (340) is connected to the differential (360); The central gear (310) and the first planetary gears (320) are both helical gears, and the central gear (310) and the first planetary gears (320) have the same helix angle, which is greater than or equal to 20° and less than or equal to 35°.

2. The electric drive system (10) according to claim 1, characterized in that The central wheel (310) and the first planetary wheel (320) have opposite rotation directions.

3. The electric drive system (10) according to claim 1, characterized in that There are a plurality of first planetary gears (320), and the plurality of first planetary gears (320) are arranged at intervals in the circumferential direction around the center wheel (310); the center distance between the first planetary gears (320) and the center wheel (310) is D, and 50 mm ≤ D ≤ 70 mm.

4. The electric drive system (10) according to claim 1, characterized in that The pressure angles of the central gear (310) and the first planetary gear (320) are equal, and the pressure angle is greater than or equal to 15° and less than or equal to 20°.

5. The electric drive system (10) according to any one of claims 1 to 4, characterized in that: The tooth width of the central wheel (310) is greater than the tooth width of the first planetary wheels (320).

6. The electric drive system (10) according to claim 5, characterized in that The tooth width of the central wheel (310) is d1, and the tooth width of the first planetary wheel (320) is d2, wherein 15 mm ≤ d2 < d1 ≤ 25 mm.

7. The electric drive system (10) according to any one of claims 1 to 4, characterized in that: The number of teeth of the first planetary gear (320) is greater than the number of teeth of the central gear (310).

8. The electric drive system (10) according to any one of claims 1 to 4, characterized in that: The reducer assembly (300) further includes a second planetary gear (330) and an inner gear ring (350); the first planetary gear (320) and the second planetary gear (330) are coaxially fixedly connected; the second planetary gear (330) is meshed with the inner gear ring (350); the inner gear ring (350) is connected to the housing (100); and the first planetary gear (320) is located on a side of the second planetary gear (330) facing the motor assembly (200).

9. The electric drive system (10) according to claim 8, characterized in that The differential (360) includes a differential housing (363), a first differential gear (361) and a second differential gear (362); the planetary carrier (340) is 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) is coaxially arranged with the output shaft (220).

10. A vehicle, characterized in that: The electric drive system (10) comprises the electric drive system (10) according to any one of claims 1 to 9.

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