Four-gear electric drive axle assembly and vehicle

Abstract

The invention relates to the technical field of automobile power, and particularly discloses a four-gear electric drive axle assembly and a vehicle, and the four-gear electric drive axle assembly comprises a motor, a first two-gear power assembly, a second two-gear power assembly and a power takeoff assembly. According to the four-gear electric drive axle assembly, the power take-off output shaft is connected with the planet carrier through the transmission mechanism, so that power on the planet carrier can be transmitted to the power take-off output shaft through the transmission mechanism, then the power is transmitted to professional equipment through the power take-off output shaft, multifunctional operation of the four-gear electric drive axle assembly is achieved, the power utilization rate of the four-gear electric drive axle assembly is increased, and the service life of the four-gear electric drive axle assembly is prolonged. The problem that in the prior art, an electric drive axle assembly is not provided with a power takeoff, power cannot be transmitted to other equipment, and the utilization rate of the electric drive axle assembly is low is effectively solved. Through cooperation of the first two-gear power assembly and the second two-gear power assembly, the purpose of four gears can be achieved, the four gears are achieved through few gear train structures, the transmission efficiency can be improved, the device adapts to a motor, and the efficiency of the motor is fully exerted.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive power, and particularly to a four-speed electric drive axle assembly and a vehicle. Background Art

[0002] Currently, in order to make the electric drive axle assembly of an automobile more efficient while meeting the power performance indicators, an increasing number of gear positions are now often adopted. If a parallel shaft form is used, when the number of reduction stages increases, it will cause a problem of excessive space; if a planetary gear set form is used, when the number of reduction stages increases, it will cause a problem of low efficiency, and at the same time, it will also cause an increase in cost.

[0003] In the multi-speed electric drive axle structure in the related art, its power output is realized by two motors cooperating with different speed ratios. The motors fully operate in the high-efficiency area. Among them, the last stage of reduction uses a planetary gear set, with the sun gear as the input and the planetary carrier as the output, making the overall structure more compact. However, the above multi-speed electric drive axle structure uses four gear train structures, reducing the advantages in terms of weight and space, and the electric drive axle assembly has no power take-off, so it is impossible to transmit power to special equipment to achieve multi-functional operations. Summary of the Invention

[0004] The purpose of the present invention is to provide a four-speed electric drive axle assembly and a vehicle, so as to solve the problem that the electric drive axle assembly in the prior art uses four gear train structures, occupies a large space, and is not equipped with a power take-off, and cannot transmit power to other devices, resulting in a low utilization rate of the electric drive axle assembly.

[0005] On the one hand, the present invention provides a four-speed electric drive axle assembly, including: a motor; a first two-speed power component, including a first transmission shaft, a second transmission shaft, a first shifting mechanism, and two driving gears. The motor is drivingly connected to the first transmission shaft, the two driving gears are fixedly arranged on the first transmission shaft, the first shifting mechanism is arranged on the second transmission shaft, and the first shifting mechanism can selectively be in transmission connection with any one of the two driving gears to transmit the power of the first transmission shaft to the second transmission shaft, and the first shifting mechanism has two gear states; a second two-speed power component, including a reduction mechanism and a second shifting mechanism. The reduction mechanism includes a sun gear and a planetary carrier, the sun gear can be in transmission connection with the planetary carrier, the reduction mechanism can be in transmission connection with the second transmission shaft, and the second shifting mechanism has two gear states. In the first gear state, the second shifting mechanism is fixedly connected to the sun gear, and in the second gear state, the second shifting mechanism is connected to the planetary carrier; a power take-off component, including a transmission mechanism and a power take-off output shaft. The power take-off output shaft is connected to the planetary carrier through the transmission mechanism, and the power take-off output shaft can be connected to special equipment.

[0006] As an alternative technical solution of the four-speed electric drive axle assembly, the transmission mechanism includes a power take-off output gear and a transmission structure. The power take-off output gear is connected to the planet carrier, and the power take-off output gear is connected to the power take-off output shaft through the transmission structure.

[0007] As an alternative technical solution of the four-speed electric drive axle assembly, the transmission structure includes a power take-off transmission shaft, a first-stage driven gear, a second-stage driving gear, a second-stage driven gear, a second-stage driven coupling gear, and a shift sleeve. The first-stage driven gear and the second-stage driving gear are arranged on the power take-off transmission shaft. The second-stage driven gear, the second-stage driven coupling gear, and the shift sleeve are arranged on the power take-off output shaft. The first-stage driven gear meshes with the power take-off output gear. The second-stage driving gear meshes with the second-stage driven gear. The shift sleeve is movably arranged to be able to mesh with the second-stage driven coupling gear.

[0008] As an alternative technical solution of the four-speed electric drive axle assembly, the first two-speed power component further includes a first driven gear fixedly connected to the second transmission shaft. The first driven gear is in transmission connection with the reduction mechanism.

[0009] As an alternative technical solution of the four-speed electric drive axle assembly, the first shifting mechanism includes a second driven gear, a third driven gear, a gear hub, and a shifting element. The second driven gear and the third driven gear can slide on the second transmission shaft. The gear hub is fixedly connected to the second transmission shaft. The shifting elements are respectively arranged on the second driven gear and the third driven gear. The gear hub is selectively in transmission connection with the shifting element arranged on the second driven gear or the third driven gear.

[0010] As an alternative technical solution of the four-speed electric drive axle assembly, the reduction mechanism further includes a planet gear and a ring gear. The sun gear is in transmission connection with the planet gear. The planet gear is rotatably connected to the planet carrier. The ring gear is in transmission connection with the planet gear and is in transmission connection with the second transmission shaft.

[0011] As an alternative technical solution of the four-speed electric drive axle assembly, the second shifting mechanism includes a fixed coupling gear, an intermediate coupling gear, a sun gear coupling gear, and a planet carrier coupling gear. The fixed coupling gear is in transmission connection with the intermediate coupling gear. The intermediate coupling gear is selectively meshed with the sun gear coupling gear or the planet carrier coupling gear. The sun gear coupling gear is fixedly connected to the sun gear. The planet carrier coupling gear is fixedly connected to the planet carrier.

[0012] As an alternative technical solution of the four-speed electric drive axle assembly, the intermediate coupling gear has a first internal coupling gear, a second internal coupling gear, and an external coupling gear. The first internal coupling gear can mesh with the sun gear coupling gear, the second internal coupling gear can mesh with the planet carrier coupling gear, and the external coupling gear meshes with the fixed coupling gear.

[0013] As an alternative technical solution of the four-speed electric drive axle assembly, the four-speed electric drive axle assembly further includes a differential and a first output half shaft and a second output half shaft arranged on the differential. The differential is fixedly connected to the planet carrier.

[0014] On the other hand, the present invention provides a vehicle including the four-speed electric drive axle assembly in any of the above solutions.

[0015] The beneficial effects of the present invention are as follows:

[0016] The present invention provides a four-speed electric drive axle assembly, which includes a motor, a first two-speed power component, a second two-speed power component, and a power take-off component. Among them, the first two-speed power component includes a first transmission shaft, a second transmission shaft, a first shifting mechanism, and two driving gears; the second two-speed power component includes a reduction mechanism and a second shifting mechanism; the power take-off component includes a transmission mechanism and a power take-off output shaft. By using the four-speed electric drive axle assembly of the present invention, the power take-off output shaft is connected to the planet carrier through the transmission mechanism, so that the power on the planet carrier can be transmitted to the power take-off output shaft through the transmission mechanism, and then the power is conveyed to the professional equipment through the power take-off output shaft, thereby realizing the multi-functional operation of the four-speed electric drive axle assembly, improving the power utilization rate of the four-speed electric drive axle assembly, and effectively solving the problem that the electric drive axle assembly in the prior art is not equipped with a power take-off and cannot transmit power to other equipment, resulting in a low utilization rate of the electric drive axle assembly; at the same time, the purpose of four speeds can be achieved by using the first two-speed power component and the second two-speed power component. Different from the four gear train structures used in the prior art, the present invention realizes four speeds with fewer gear train structures, which can increase the transmission efficiency and adapt to the motor, and fully exerts the motor efficiency. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of the four-speed electric drive axle assembly in the embodiment of the present invention;

[0018] Figure 2 It is a schematic structural diagram of the power take-off component in the embodiment of the present invention;

[0019] Figure 3 It is a schematic structural diagram of the first two-speed power component in the embodiment of the present invention;

[0020] Figure 4 It is a schematic structural diagram of the second two-speed power component in the embodiment of the present invention.

[0021] In the figure:

[0022] 1. Motor

[0023] 2. First two-speed power assembly; 21. First transmission shaft; 22. Second transmission shaft; 23. First shifting mechanism; 231. Second driven gear; 232. Third driven gear; 233. Gear hub; 24. Driving gear; 25. First driven gear

[0024] 3. Second two-speed power assembly; 31. Reduction mechanism; 311. Sun gear; 312. Planet gear; 313. Planet carrier; 314. Ring gear; 32. Second shifting mechanism; 321. Fixed engaging tooth; 322. Intermediate engaging tooth; 3221. First internal engaging tooth; 3222. Second internal engaging tooth; 3223. External engaging tooth; 323. Sun gear engaging tooth; 324. Planet carrier engaging tooth

[0025] 4. Power take-off assembly; 41. Transmission mechanism; 411. Power take-off output tooth; 412. Transmission structure; 4121. Power take-off transmission shaft; 4122. First-stage driven gear; 4123. Second-stage driving gear; 4124. Second-stage driven gear; 4125. Second-stage driven engaging tooth; 4126. Shifting gear sleeve; 42. Power take-off output shaft

[0026] 51. Differential; 52. First output half shaft; 53. Second output half shaft Detailed implementation mode

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "under" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0029] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "mounted", "connected" and "coupled" shall be construed broadly. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation on the present invention.

[0031] As Figures 1 to 4As shown in the figure, this embodiment provides a four-speed electric drive axle assembly, which includes a motor 1, a first two-speed power component 2, a second two-speed power component 3, and a power take-off component 4. Among them, the first two-speed power component 2 includes a first transmission shaft 21, a second transmission shaft 22, a first shifting mechanism 23, and two driving gears 24. The motor 1 and the first transmission shaft 21 are drivingly connected. The two driving gears 24 are fixedly arranged on the first transmission shaft 21. The first shifting mechanism 23 is arranged on the second transmission shaft 22. The first shifting mechanism 23 can selectively be in transmission connection with any one of the two driving gears 24 to transmit the power of the first transmission shaft 21 to the second transmission shaft 22, and the first shifting mechanism 23 has two gear states; the second two-speed power component 3 includes a reduction mechanism 31 and a second shifting mechanism 32. The reduction mechanism 31 includes a sun gear 311 and a planet carrier 313. The sun gear 311 can be in transmission connection with the planet carrier 313. The reduction mechanism 31 can be in transmission connection with the second transmission shaft 22. The second shifting mechanism 32 has two gear states. In the first gear state, the second shifting mechanism 32 is fixedly connected to the sun gear 311. In the second gear state, the second shifting mechanism 32 is connected to the planet carrier 313; the power take-off component 4 includes a transmission mechanism 41 and a power take-off output shaft 42. The power take-off output shaft 42 is connected to the planet carrier 313 through the transmission mechanism 41. The power take-off output shaft 42 can be connected to a special equipment.

[0032] By adopting the four-speed electric drive axle assembly of the present invention, the power take-off output shaft 42 is connected to the planet carrier 313 through the transmission mechanism 41. In this way, the power on the planet carrier 313 can be transmitted to the power take-off output shaft 42 through the transmission mechanism 41, and then the power is conveyed to the professional equipment through the power take-off output shaft 42, so as to realize the multi-functional operation of the four-speed electric drive axle assembly, improve the power utilization rate of the four-speed electric drive axle assembly, and effectively solve the problem in the prior art that the electric drive axle assembly is not equipped with a power take-off and cannot transmit the power to other equipment, resulting in a low utilization rate of the electric drive axle assembly; at the same time, the purpose of four speeds can be achieved by using the first two-speed power component 2 and the second two-speed power component 3. Different from the four gear train structures used in the prior art, the present invention realizes four speeds with fewer gear train structures, can increase the transmission efficiency and adapt to the motor, and gives full play to the motor efficiency. Among them, the diameters of the two driving gears 24 are different.

[0033] It should be noted that, since the first shift mechanism 23 can be selectively connected to any one of the two driving gears 24 to transmit the power of the first transmission shaft 21 to the second transmission shaft 22, and the first shift mechanism 23 has two gear states, and the second shift mechanism 32 has two gear states, in the first gear state, the second shift mechanism 32 is fixedly connected to the sun gear 311, and in the second gear state, the second shift mechanism 32 is connected to the planetary carrier 313. In this way, the first shift mechanism 23 and the second shift mechanism 32 cooperate with each other, so that the four-speed electric drive axle assembly can have four gears. Compared with the electric drive axle assembly in the prior art, the four-speed electric drive axle assembly provided by the present invention occupies less longitudinal space, has high transmission efficiency, and has a more compact structure.

[0034] In some embodiments, the transmission mechanism 41 includes a power output tooth 411 and a transmission structure 412. The power output tooth 411 is connected to the planet carrier 313, so that the planet carrier 313 can transmit power to the power output tooth 411. Since the power output tooth 411 is connected to the power output shaft 42 through the transmission structure 412, the power output tooth 411 can transmit power to the power output shaft 42, thereby achieving the purpose of transmitting power to the special equipment. The transmission structure 412 includes but is not limited to a multi-stage tooth transmission structure to meet actual needs.

[0035] Specifically, the transmission structure 412 includes a power take-off transmission shaft 4121, a primary driven gear 4122, a secondary driving gear 4123, a secondary driven wheel 4124, a secondary driven combining tooth 4125 and a gear sleeve 4126. The primary driven gear 4122 and the secondary driving gear 4123 are arranged on the power take-off transmission shaft 4121, the secondary driven wheel 4124, the secondary driven combining tooth 4125 and the gear sleeve 4126 are arranged on the power take-off output shaft 42, the primary driven gear 4122 is meshed with the power take-off output tooth 411, and the secondary driving gear 4123 is meshed with the secondary driven wheel 4124. When the gear sleeve 4126 moves, the power take-off output shaft 42 is fixedly connected to the secondary driven wheel 4124, and the planetary carrier 313 outputs power and transmits it to the primary driven gear 4122 through the power take-off output gear 411, the primary driven gear 4122 is fixedly connected to the secondary driving gear 4123, and the power is transmitted to the secondary driven wheel 4124 through the secondary driving gear 4123, thereby transmitting the power to the power take-off output shaft 42, and then transmitting the power to special equipment to realize multi-functional operation.

[0036] Specifically, the first two-speed power assembly 2 also includes a first driven gear 25 fixedly connected to the second transmission shaft 22. The first driven gear 25 is transmission-connected to the reduction mechanism 31, so that the transmission connection between the first two-speed power assembly 2 and the second two-speed power assembly 3 can be achieved.

[0037] In this embodiment, the first shifting mechanism 23 includes a second driven gear 231, a third driven gear 232, a gear hub 233 and a shifting element. The second driven gear 231 and the third driven gear 232 can be slidably arranged on the second transmission shaft 22, the gear hub 233 is fixedly connected to the second transmission shaft 22, and the shifting element is respectively arranged on the second driven gear 231 and the third driven gear 232. In this way, the gear hub 233 can be selectively connected to the shifting element arranged on the second driven gear 231 or the third driven gear 232 through transmission, so as to achieve the purpose of shifting.

[0038] Wherein, the shift element is a shift engaging tooth.

[0039] Specifically, in order to realize the transmission between the speed reduction mechanism 31, the speed reduction mechanism 31 also includes a planetary gear 312 and a ring gear 314. The sun gear 311 is connected to the planetary gear 312, the planetary gear 312 is connected to the planet carrier 313, and the ring gear 314 is connected to the planetary gear 312 and the second transmission shaft 22. In this way, a planetary gear train can be formed. The ring gear 314 is used to transmit power to the planetary gear 312 and the sun gear 311, so that the purpose of shifting gears while realizing the transmission connection can be achieved.

[0040] In this embodiment, the second shift mechanism 32 includes a fixed combination tooth 321, an intermediate combination tooth 322, a sun gear combination tooth 323 and a planet carrier combination tooth 324. The fixed combination tooth 321 is transmission-connected with the intermediate combination tooth 322. The intermediate combination tooth 322 can selectively mesh with the sun gear combination tooth 323 or the planet carrier combination tooth 324. The sun gear combination tooth 323 is fixedly connected to the sun gear 311, and the planet carrier combination tooth 324 is fixedly connected to the planet carrier 313. Further, the intermediate combination tooth 322 has a first inner combination tooth 3221, a second inner combination tooth 3222 and an outer combination tooth 3223. The first inner combination tooth 3221 can mesh with the sun gear combination tooth 323, the second inner combination tooth 3222 can mesh with the planet carrier combination tooth 324, and the outer combination tooth 3223 meshes with the fixed combination tooth 321.

[0041] The second shift mechanism 32 includes two gear positions. In the first gear position, the first inner tooth 3221 on the middle tooth 322 in the second shift mechanism 32 is fixedly connected to the sun gear 311, the outer tooth 3223 is fixedly connected to the fixed tooth 321, and the first inner tooth 3221 does not participate in meshing, so that the sun gear 311 is fixed and does not rotate, and the planet carrier 313 can rotate. In the second gear position, the first inner tooth 3221 on the middle tooth 322 in the second shift mechanism 32 is fixedly connected to the sun gear 311, the second inner tooth 3222 is connected to the planet carrier 313, and the outer tooth 3223 does not participate in meshing, so that the sun gear 311 is connected to the planet carrier 313, and the two rotate together.

[0042] Specifically, the four-speed electric drive axle assembly further includes a differential 51, a first output half shaft 52 and a second output half shaft 53 disposed on the differential 51. The differential 51 is fixedly connected to the planet carrier 313. The differential 51 enables the first output half shaft 52 and the second output half shaft 53 to work simultaneously at different speeds.

[0043] Optionally, the motor 1 and the first two-speed power assembly 2 are two groups. The two groups of the motor 1 and the first two-speed power assembly 2 are respectively on both sides of the second two-speed power assembly 3 to achieve a dual-motor configuration, generate more gear combination modes, and improve the modularization ability and overall efficiency of the four-speed electric drive axle assembly.

[0044] This embodiment also provides a vehicle, including the four-speed electric drive axle assembly in the above solution. Since it includes the above four-speed electric drive axle assembly, the vehicle in the embodiment of the present invention has all the advantages and beneficial effects of the above embodiment, which will not be elaborated here.

[0045] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A four-speed electric drive axle assembly, characterized in that Comprising: A motor (1); A first two-speed power assembly (2), including a first transmission shaft (21), a second transmission shaft (22), a first shifting mechanism (23) and two driving gears (24). The motor (1) is drivingly connected to the first transmission shaft (21). The two driving gears (24) are fixedly arranged on the first transmission shaft (21). The first shifting mechanism (23) is arranged on the second transmission shaft (22). The first shifting mechanism (23) is selectively drivingly connected to any one of the two driving gears (24) to transmit the power of the first transmission shaft (21) to the second transmission shaft (22), and the first shifting mechanism (23) has two gear states; A second two-speed power assembly (3), including a reduction mechanism (31) and a second shifting mechanism (32). The reduction mechanism (31) includes a sun gear (311) and a planet carrier (313). The sun gear (311) can be drivingly connected to the planet carrier (313). The reduction mechanism (31) can be drivingly connected to the second transmission shaft (22). The second shifting mechanism (32) has two gear states. In the first gear state, the second shifting mechanism (32) is fixedly connected to the sun gear (311). In the second gear state, the second shifting mechanism (32) is connected to the planet carrier (313); A power take-off assembly (4), including a transmission mechanism (41) and a power take-off output shaft (42). The power take-off output shaft (42) is connected to the planet carrier (313) through the transmission mechanism (41). The power take-off output shaft (42) can be connected to a special equipment.

2. The four-speed electric drive axle assembly according to claim 1, wherein, The transmission mechanism (41) includes a power take-off output gear (411) and a transmission structure (412). The power take-off output gear (411) is connected to the planet carrier (313). The power take-off output gear (411) is connected to the power take-off output shaft (42) through the transmission structure (412).

3. The four-speed electric drive bridge assembly according to claim 2, wherein, The transmission structure (412) includes a power take-off transmission shaft (4121), a first-stage driven gear (4122), a second-stage driving gear (4123), a second-stage driven gear (4124), a second-stage driven engaging tooth (4125) and a gear shifting sleeve (4126). The first-stage driven gear (4122) and the second-stage driving gear (4123) are arranged on the power take-off transmission shaft (4121). The second-stage driven gear (4124), the second-stage driven engaging tooth (4125) and the gear shifting sleeve (4126) are arranged on the power take-off output shaft (42). The first-stage driven gear (4122) meshes with the power take-off output gear (411). The second-stage driving gear (4123) meshes with the second-stage driven gear (4124). The gear shifting sleeve (4126) is movably arranged to be able to mesh with the second-stage driven engaging tooth (4125).

4. The four-speed electric drive axle assembly according to claim 1, wherein The first two-speed power assembly (2) further includes a first driven gear (25) fixedly connected to the second transmission shaft (22), and the first driven gear (25) is in transmission connection with the reduction mechanism (31).

5. The four-speed electric drive axle assembly according to claim 4, wherein, The first shifting mechanism (23) includes a second driven gear (231), a third driven gear (232), a gear hub (233) and a shifting element. The second driven gear (231) and the third driven gear (232) are slidably disposed on the second transmission shaft (22), the gear hub (233) is fixedly connected to the second transmission shaft (22), the shifting element is respectively disposed on the second driven gear (231) and the third driven gear (232), and the gear hub (233) is selectively in transmission connection with the shifting element disposed on the second driven gear (231) or the third driven gear (232).

6. The four-speed electric drive axle assembly according to claim 1, characterized in that, The reduction mechanism (31) further includes a planetary gear (312) and a ring gear (314). The sun gear (311) is in transmission connection with the planetary gear (312), the planetary gear (312) is rotatably connected to the planet carrier (313), the ring gear (314) is in transmission connection with the planetary gear (312) and is in transmission connection with the second transmission shaft (22).

7. The four-speed electric drive axle assembly according to claim 6, characterized in that The second shifting mechanism (32) includes a fixed engaging tooth (321), an intermediate engaging tooth (322), a sun gear engaging tooth (323) and a planet carrier engaging tooth (324). The fixed engaging tooth (321) is in transmission connection with the intermediate engaging tooth (322), the intermediate engaging tooth (322) is selectively engaged with the sun gear engaging tooth (323) or the planet carrier engaging tooth (324), the sun gear engaging tooth (323) is fixedly connected to the sun gear (311), and the planet carrier engaging tooth (324) is fixedly connected to the planet carrier (313).

8. The four-speed electric drive axle assembly according to claim 7, characterized in that, The intermediate engaging tooth (322) has a first inner engaging tooth (3221), a second inner engaging tooth (3222) and an outer engaging tooth (3223). The first inner engaging tooth (3221) can be engaged with the sun gear engaging tooth (323), the second inner engaging tooth (3222) can be engaged with the planet carrier engaging tooth (324), and the outer engaging tooth (3223) is engaged with the fixed engaging tooth (321).

9. The four-speed electric drive axle assembly according to claim 1, wherein, The four-speed electric drive axle assembly further includes a differential (51) and a first output half shaft (52) and a second output half shaft (53) disposed on the differential (51), and the differential (51) is fixedly connected to the planet carrier (313).

10. A vehicle, characterized in that, Including the four-speed electric drive axle assembly according to any one of claims 1-9.

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