Four-speed electric drive axle and vehicle

Abstract

The present invention relates to the technical field of electric drive axles, and in particular to a four-speed electric drive axle and a vehicle. The four-speed electric drive axle provided by the present invention comprises a pair of output half shafts, a differential, a first intermediate shaft transmission mechanism, a second intermediate shaft transmission mechanism, a first shift mechanism, a second shift mechanism and a motor; wherein the pair of output half shafts are coaxially arranged, the differential is arranged between the pair of output half shafts, and the power output part of the differential is connected to the output half shafts; the first intermediate shaft transmission mechanism and the second intermediate shaft transmission mechanism are respectively arranged on both sides of the pair of output half shafts; the motor is offset to one side of the pair of output half shafts. The four-speed electric drive axle and the vehicle provided by the present invention can realize four gears, and a large torque output can be achieved by a smaller motor, which can effectively reduce the cost of the electric drive axle, and the service life can be guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of electric drive axles, and in particular to a four-speed electric drive axle and a vehicle. Background Art

[0002] The electric drive axle system, that is, the motor-driven axle system, includes a motor, a gear transmission device, a shift device and an output shaft arranged on the axle of the vehicle.

[0003] With the rapid development of electrification of medium and heavy commercial vehicles, matching electric drive axle systems has become mainstream. In related technologies, due to the large wheel traction requirements of heavy commercial vehicles, the existing technology uses motors with larger torque to meet the large wheel traction requirements, which leads to higher motor costs. Moreover, the gear transmission devices of the electric drive axle are usually concentrated on the same side of the output shaft. Due to the high vibration of the working conditions of the electric drive axle, this arrangement is difficult to meet the design requirements of long vehicle life.

[0004] Therefore, how to solve the problem of high cost and short service life of electric drive bridges in the prior art has become an important technical problem to be solved by those skilled in the art. Summary of the invention

[0005] The present invention provides a four-speed electric drive axle and a vehicle, which can realize four gears and achieve high torque output through a relatively small motor, can effectively reduce the cost of the electric drive axle, and can ensure the service life.

[0006] A first aspect of the present invention provides a four-speed electric drive axle, comprising a pair of output half shafts, a differential, a first intermediate shaft transmission mechanism, a second intermediate shaft transmission mechanism, a first shift mechanism, a second shift mechanism and a motor; wherein the pair of output half shafts are coaxially arranged, the differential is arranged between the pair of output half shafts, and the power output part of the differential is connected to the output half shafts; the first intermediate shaft transmission mechanism and the second intermediate shaft transmission mechanism are respectively arranged on both sides of the pair of output half shafts; the motor is offset to one side of the pair of output half shafts;

[0007] The first intermediate shaft transmission mechanism comprises: a first intermediate shaft and a first gear, a second gear and a fourth gear arranged on the first intermediate shaft; the second intermediate shaft transmission mechanism comprises: a second intermediate shaft and a fifth gear, a sixth gear and a seventh gear arranged on the second intermediate shaft; the pair of output half shafts are provided with an eighth gear, a ninth gear, a tenth gear, an eleventh gear, a twelfth gear and a thirteenth gear;

[0008] The motor is drivingly connected to the first intermediate shaft;

[0009] The ninth gear is connected to the power input part of the differential and meshes with the sixth gear, the eighth gear is meshed with the seventh gear, the tenth gear is meshed with the fifth gear, the eleventh gear is meshed with the second gear, the twelfth gear is meshed with the first gear, and the thirteenth gear is meshed with the fourth gear;

[0010] The first shift mechanism can be switched between a first position, a second position and a third position. In the first position, the tenth gear is coupled to the eleventh gear. In the second position, the tenth gear is coupled to the twelfth gear. In the third position, the tenth gear, the eleventh gear and the twelfth gear are disconnected from each other.

[0011] The second shift mechanism can switch between a fourth position, a fifth position and a sixth position. In the fourth position, the thirteenth gear is coupled to the eighth gear. In the fifth position, the thirteenth gear is coupled to the power input part of the differential. In the sixth position, the thirteenth gear, the eighth gear and the power input part of the differential are disengaged from each other.

[0012] According to the four-speed electric drive axle provided by the present invention, the first intermediate shaft transmission mechanism is provided in a pair and is symmetrically distributed on both sides of the pair of output half shafts.

[0013] According to the four-speed electric drive axle provided by the present invention, the second intermediate shaft transmission mechanism is provided in a pair and is symmetrically distributed on both sides of the pair of output half shafts.

[0014] According to the four-speed electric drive axle provided by the present invention, the motors are arranged as a pair, and the pair of motors are transmission-connected with a pair of intermediate shaft transmission mechanisms in a one-to-one correspondence.

[0015] According to the four-speed electric drive axle provided by the present invention, the first intermediate shaft transmission mechanism also includes a third gear arranged on each of the first intermediate shafts, and a fourteenth gear is arranged on the output shaft of each of the motors, and the fourteenth gear is meshed with the third gear.

[0016] According to the four-speed electric drive axle provided by the present invention, the pair of output half-shafts are respectively a first output half-shaft and a second output half-shaft, wherein the thirteenth gear and the eighth gear are loosely mounted on the first output half-shaft.

[0017] According to the four-speed electric drive axle provided by the present invention, the tenth gear, the eleventh gear and the twelfth gear are all loosely mounted on the second output half shaft.

[0018] According to the four-speed electric drive axle provided by the present invention, the tenth gear is loosely mounted on the output half shaft via the first intermediate shaft, and the thirteenth gear is loosely mounted on the output half shaft via the second intermediate shaft.

[0019] According to the four-speed electric drive axle provided by the present invention, the output shaft of the motor is arranged in parallel with the pair of output half-shafts.

[0020] A second aspect of the present invention provides a vehicle, provided with an axle, wherein the axle is configured as a four-speed electric drive axle as described in any one of the above items.

[0021] In the technical solution provided by the present invention, the first intermediate shaft transmission mechanism and the second intermediate shaft transmission mechanism are respectively distributed on both sides of a pair of output half shafts, and the weight on both sides of the output half shafts is relatively balanced, that is, the weight on both sides of the axle of the electric drive axle is relatively balanced. Compared with the prior art, in which the weight of the electric drive axle is concentrated on one side of the axle, this arrangement is more stable and reliable, and is conducive to improving the service life of the electric drive axle. In addition, through the technical solution provided by the present invention, a four-speed transmission mode can be realized, and then, high-speed and high-torque transmission can be achieved. The power transmission routes of the four-speed transmission mode are as follows:

[0022] First gear (first shift mechanism is in the second position, second shift mechanism is in the sixth position): motor → first intermediate shaft → first gear → twelfth gear → first shift mechanism → tenth gear → fifth gear → second intermediate shaft → sixth gear → ninth gear → differential → output half shaft;

[0023] Second gear (the first shift mechanism is in the first position, the second shift mechanism is in the sixth position): motor → first intermediate shaft → second gear → eleventh gear → first shift mechanism → tenth gear → fifth gear → second intermediate shaft → sixth gear → ninth gear → differential → output half shaft;

[0024] The third gear (the first shift mechanism is in the third position, the second shift mechanism is in the fourth position): motor → first intermediate shaft → fourth gear → thirteenth gear → second shift mechanism → eighth gear → seventh gear → second intermediate shaft → sixth gear → ninth gear → differential → output half shaft;

[0025] Fourth gear (the first shift mechanism is in the third position, the second shift mechanism is in the fifth position): motor → first intermediate shaft → fourth gear → thirteenth gear → second shift mechanism → differential → output half shaft;

[0026] Among them, the fourth gear provides the shortest mechanical transmission path, has high mechanical efficiency, and is suitable for low-load driving in the full speed range. The technical solution provided by the present invention can realize multi-gear switching of the electric drive bridge and can realize power output from low-speed high torque to full-speed low torque. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a schematic diagram of a single motor offset four-speed electric drive bridge in the first embodiment of the present invention;

[0029] Figure 2 It is a schematic diagram of a single motor offset four-speed electric drive bridge in a second embodiment of the present invention;

[0030] Figure 3 It is a schematic diagram of a dual-motor offset four-speed electric drive bridge in the third embodiment of the present invention;

[0031] Figure 4 It is a schematic diagram of a single motor offset four-speed electric drive bridge in a fourth embodiment of the present invention;

[0032] Figure 5 It is a schematic diagram of a single motor offset four-speed electric drive bridge in a fifth embodiment of the present invention;

[0033] Figure 6 It is a schematic diagram of a dual-motor offset four-speed electric drive bridge in the sixth embodiment of the present invention.

[0034] Reference numerals:

[0035] 10: output shaft of motor MG; 11: fourteenth gear; 20: first intermediate shaft; 21: first gear; 22: second gear; 23: third gear; 24: fourth gear; 30: second intermediate shaft; 31: seventh gear; 32: sixth gear; 33: fifth gear; 40: first intermediate shaft; 41: twelfth gear; 42: eleventh gear; 43: tenth gear; 50: second intermediate shaft; 51: thirteenth gear; 52: eighth gear; 60: output half shaft; 61: differential; 62: ninth gear; K1: first shift mechanism; K2: second shift mechanism; MG: motor. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] It should be understood that the electric drive axle is an electric drive device that integrates the motor, gear transmission system, and shift mechanism on the vehicle axle. It is different from the power structure of gasoline vehicles and hybrid vehicles in the prior art. The power structure of the electric drive axle is integrated with the vehicle axle, which has higher transmission efficiency. In addition, the layout of the electric drive axle has a high degree of integration, which can effectively save space and facilitate the layout of the vehicle power battery.

[0038] In the prior art, the motor of the electric drive axle is coaxially arranged with the output shaft of the axle. The liquid cooling seal of the motor of the electric drive axle with the coaxially arranged motor is difficult to set and the cost is relatively high. In addition, the electric drive axle in the prior art is usually only set to two gears, and the torque output range is relatively narrow. In order to meet the high torque requirements of medium and heavy-duty commercial vehicles, the electric drive axle in the prior art is usually equipped with a planetary gear reduction mechanism on the wheel side, and the output shaft of the electric drive axle drives the wheel through the planetary gear reduction mechanism, which can further improve the torque output. However, the arrangement of the wheel side planetary gear reduction mechanism increases the complexity of the transmission mechanism, and the planetary gear reduction mechanism is complex in structure, heavy in weight, and high in cost.

[0039] In addition, the gear transmission system of the electric drive axle in the prior art is mostly concentrated on the same side of the axle housing, resulting in uneven weight distribution of the axle on both sides of the output shaft. As the vehicle is used, the electric drive axle is prone to deformation and damage.

[0040] Combine the following Figures 1 to 6 A four-speed electric drive axle and a vehicle provided in an embodiment of the present invention are described.

[0041] The four-speed electric drive axle provided in the embodiment of the present invention includes a pair of output half shafts 60, a differential 61, a first intermediate shaft transmission mechanism, a second intermediate shaft transmission mechanism, a first shift mechanism K1, a second shift mechanism K2 and a motor MG.

[0042] A pair of output half shafts 60, a differential 61, a first intermediate shaft transmission mechanism, a second intermediate shaft transmission mechanism, a first shift mechanism K1 and a second shift mechanism K2 are all integrated inside the axle housing. The first intermediate shaft transmission mechanism and the second intermediate shaft transmission mechanism are respectively distributed on both sides of the output half shaft 60. The motor MG can be arranged on the outside of the axle housing, and the output shaft 10 of the motor MG extends into the axle housing and is connected to the first intermediate shaft transmission mechanism through gear transmission.

[0043] The electric drive axle provided in this embodiment has a first intermediate shaft transmission mechanism and a second intermediate shaft transmission mechanism respectively distributed on both sides of the output half shaft 60, that is, the main gear transmission system is distributed on both sides of the output half shaft 60, and the weight is evenly distributed to avoid weight concentration on one side of the output half shaft 60. In a vibrating use environment, it has a long service life.

[0044] In addition, the electric drive axle provided in this embodiment has an offset motor MG (the output shaft 10 of the motor MG is offset from the output half shaft 60), and the liquid cooling system of the motor MG can be arranged separately. The liquid cooling system has a simple structure, which effectively reduces the cost of use.

[0045] Moreover, the electric drive axle provided in this embodiment can realize a four-speed transmission mode through the arrangement of the first intermediate shaft transmission mechanism and the second intermediate shaft transmission mechanism, meeting the requirements of various working conditions from low speed and high torque output to high speed and low torque output. In order to realize the four-gear transmission mode, the first intermediate shaft transmission mechanism includes: a first intermediate shaft 20 and a first gear 21, a second gear 22, and a fourth gear 24 arranged on the first intermediate shaft 20. The second intermediate shaft transmission mechanism includes: a second intermediate shaft 30 and a fifth gear 33, a sixth gear 32, and a seventh gear 31 arranged on the second intermediate shaft 30. An eighth gear 52, a ninth gear 62, a tenth gear 43, an eleventh gear 42, a twelfth gear 41, and a thirteenth gear 51 are mounted on a pair of output half shafts;

[0046] The motor MG is in driving connection with the first intermediate shaft 20 ; in some embodiments, the two may be connected via a primary gear transmission, or via secondary or higher gears.

[0047] The ninth gear 62 is connected to the power input part of the differential 61 and meshes with the sixth gear 32, the eighth gear 52 meshes with the seventh gear 31, the tenth gear 43 meshes with the fifth gear 33, the eleventh gear 42 meshes with the second gear 22, the twelfth gear 41 meshes with the first gear 21, and the thirteenth gear 51 meshes with the fourth gear 24.

[0048] The first shift mechanism K1 can be switched between the first position, the second position and the third position. When the first shift mechanism K1 is in the first position, the sliding sleeve of the first shift mechanism K1 couples and connects the tenth gear 43 with the eleventh gear 42. When the first shift mechanism K1 is in the second position, the sliding sleeve of the first shift mechanism K1 couples and connects the tenth gear 43 with the twelfth gear 41. When the first shift mechanism K1 is in the third position, the sliding sleeve of the first shift mechanism K1 is disengaged from the gear, that is, the tenth gear 43, the eleventh gear 42 and the twelfth gear 41 are disconnected from each other.

[0049] The second shift mechanism K2 can be switched between the fourth position, the fifth position and the sixth position. When the second shift mechanism K2 is in the fourth position, the thirteenth gear 51 is coupled to the eighth gear 52. When the second shift mechanism K2 is in the fifth position, the thirteenth gear 51 is coupled to the power input part of the differential 61. When the second shift mechanism K2 is in the sixth position, the thirteenth gear 51, the eighth gear 52 and the power input part of the differential are disconnected from each other.

[0050] With this setting, the transmission routes of the four gear modes are:

[0051] First gear position (the first shift mechanism K1 is in the second position, the second shift mechanism K2 is in the sixth position): motor MG→first intermediate shaft 20→first gear 21→twelfth gear 41→first shift mechanism K1→tenth gear 43→fifth gear 33→second intermediate shaft 30→sixth gear 32→ninth gear 62→differential 61→output half shaft 60;

[0052] Second gear position (the first shift mechanism K1 is in the first position, the second shift mechanism K2 is in the sixth position): motor MG→first intermediate shaft 20→second gear 22→eleventh gear 42→first shift mechanism K1→tenth gear 43→fifth gear 33→second intermediate shaft 30→sixth gear 32→ninth gear 62→differential 61→output half shaft 60;

[0053] The third gear (the first shift mechanism K1 is in the third position, the second shift mechanism K2 is in the fourth position): the motor MG→the first intermediate shaft 20→the fourth gear 24→the thirteenth gear 51→the second shift mechanism K2→the eighth gear 52→the seventh gear 31→the second intermediate shaft 30→the sixth gear 32→the ninth gear 62→the differential 61→the output half shaft 60;

[0054] Fourth gear (the first shift mechanism K1 is in the third position, the second shift mechanism K2 is in the fifth position): motor MG→first intermediate shaft 20→fourth gear 24→thirteenth gear 51→second shift mechanism K2→differential 61→output half shaft 60;

[0055] Among them, the fourth gear provides the shortest mechanical transmission path, has high mechanical efficiency, and is suitable for low-load driving in the full speed range. The technical solution provided by the embodiment of the present invention can realize multi-gear switching of the electric drive bridge and can realize power output from low-speed high torque to full-speed low torque.

[0056] In this way, the electric drive axle provided by the embodiment of the present invention can be provided with a motor MG with relatively small torque to replace the high-torque motor MG in the prior art, which can effectively reduce costs. Moreover, in some embodiments, the electric drive axle provided by this embodiment can achieve high torque output without using a wheel-side planetary gear reducer, which effectively reduces the wheel-side mass, simplifies the mechanical structure, and reduces costs.

[0057] The electric drive axle provided in this embodiment requires fewer gears and only two shift mechanisms to achieve four-speed transmission, with fewer intermediate transmission gears and high transmission efficiency.

[0058] In addition, in the present embodiment, the motor MG may be arranged between two gears on the first intermediate shaft 20 , which may significantly reduce the axial space of the electric drive axle occupied by the motor MG.

[0059] In a further embodiment, Figure 2 As shown, the second intermediate shaft transmission mechanism is arranged in a pair and is symmetrically distributed on both sides of a pair of output half shafts 60. That is, the second intermediate shaft 30 and the fifth gear 33, the sixth gear 32, and the seventh gear 31 arranged on the second intermediate shaft 30 are arranged in pairs, and each pair of second intermediate shaft transmission mechanisms is symmetrically distributed on both sides of a pair of output half shafts 60.

[0060] In this configuration, the pair of fifth gears 33 are simultaneously meshed with the tenth gear 43, the pair of sixth gears 32 are simultaneously meshed with the ninth gear 62, and the pair of seventh gears 31 are simultaneously meshed with the eighth gear 52. The pair of second intermediate shaft transmission mechanisms can effectively improve the load capacity of the transmission mechanism and are suitable for commercial vehicles with heavy load requirements.

[0061] In another embodiment, if Figure 3 As shown, the first intermediate shaft transmission mechanism is arranged in a pair and is symmetrically distributed on both sides of a pair of output half shafts 60. That is, the first intermediate shaft 20 and the first gear 21, the second gear 22, and the fourth gear 24 arranged on the first intermediate shaft 20 are arranged in pairs, and each first intermediate shaft transmission mechanism is symmetrically distributed on both sides of a pair of output half shafts 60.

[0062] In this configuration, the pair of first gears 21 are simultaneously meshed with the twelfth gear 41, the pair of second gears 22 are simultaneously meshed with the eleventh gear 42, and the pair of fourth gears 24 are simultaneously meshed with the thirteenth gear 51. The pair of first intermediate shaft transmission mechanisms can effectively improve the load capacity of the transmission mechanism and are suitable for commercial vehicles with heavy load requirements.

[0063] In some embodiments, for a vehicle with a smaller torque requirement, only one motor MG may be provided. Figure 1 and Figure 2 shown.

[0064] In another embodiment, when the vehicle has a greater torque demand, such as Figure 3 As shown, a pair of motors MG and a pair of first intermediate shaft transmission mechanisms may be provided, the pair of motors MG and the pair of first intermediate shaft transmission mechanisms are in one-to-one transmission connection, and the pair of first intermediate shaft transmission mechanisms are symmetrically distributed at both sides of a pair of output half shafts 60, and the pair of motors MG are also symmetrically distributed at both sides of a pair of output half shafts 60. In addition, the output shaft 10 of the motor MG is arranged in parallel with the pair of output half shafts 60.

[0065] The pair of motors MG can simultaneously output torque to the pair of output half shafts 60 through the first intermediate shaft transmission mechanism and the second intermediate shaft transmission mechanism, thereby effectively improving the torque output of the vehicle.

[0066] Using a pair of motors MG can output a greater torque, and the cost of a pair of low-torque motors MG can be effectively reduced relative to the cost of a high-torque motor.

[0067] In some embodiments, the motor MG can be connected to the first intermediate shaft transmission mechanism through a first-stage gear transmission. Specifically, the first intermediate shaft transmission mechanism also includes a third gear 23 arranged on each first intermediate shaft 20, and a fourteenth gear 11 is arranged on the output shaft 10 of each motor MG, and the fourteenth gear 11 is meshed with the third gear 23.

[0068] In a further embodiment, the pair of output half shafts 60 are respectively a first output half shaft 60 and a second output half shaft 60, wherein the thirteenth gear 51 and the eighth gear 52 are loosely mounted on the first output half shaft 60. The tenth gear 43, the eleventh gear 42 and the twelfth gear 41 are all loosely mounted on the second output half shaft 60.

[0069] In this way, the transmission shaft gear mechanism for realizing the third gear and the fourth gear, that is, the fourth gear 24, the thirteenth gear 51, the second shift mechanism K2, the eighth gear 52 and the seventh gear 31 are located on the same side as the first output half shaft 60. The transmission shaft gear mechanism for realizing the first gear and the second gear, that is, the first gear 21, the second gear 22, the twelfth gear 41, the first shift mechanism K1, the tenth gear 43, the eleventh gear 42, the fifth gear 33 and the second output half shaft 60 are located on the same side, and the limited axial space of the output half shaft 60 is fully and evenly utilized.

[0070] In some embodiments, the tenth gear 43 is loosely sleeved on the output half shaft 60 through the first intermediate shaft 40, and the thirteenth gear 51 is loosely sleeved on the output half shaft 60 through the second intermediate shaft 50. The first intermediate shaft 40 and the second intermediate shaft 50 have a hollow structure and can be sleeved on the output half shaft 60 through a bearing, and a gear structure is provided at one end of the intermediate shaft to couple with the shift mechanism. The eighth gear 52 can be loosely sleeved on the second intermediate shaft 50.

[0071] It should be noted that, in other embodiments, the gears on the output half shaft 60 may also be centrally arranged on one output half shaft 60, such as Figure 4-Figure 6 As shown. In this embodiment, the first intermediate shaft transmission mechanism and the second intermediate shaft transmission mechanism are also respectively arranged at the two sides of the output half shaft 60, and the first intermediate shaft transmission mechanism can be provided with only one set or a pair. Similarly, the second intermediate shaft transmission mechanism can also be provided with only one set or a pair. According to the torque requirement of the vehicle, the motor MG can also be provided with one or two.

[0072] The embodiment of the present invention also provides a vehicle, which is provided with a four-speed electric drive axle as in any of the above embodiments. With such a configuration, the vehicle provided in this embodiment can achieve four gears, and a large torque output can be achieved through a smaller motor, which can effectively reduce the cost of the electric drive axle, and the service life can be guaranteed. The derivation process of this beneficial effect is generally similar to the derivation process of the beneficial effect brought by the above-mentioned four-speed electric drive axle, and will not be repeated here.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention 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 make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A four-speed electric drive axle, characterized in that: The invention comprises a pair of output half shafts (60), a differential (61), a first intermediate shaft transmission mechanism, a second intermediate shaft transmission mechanism, a first gear shift mechanism (K1), a second gear shift mechanism (K2), and a motor; wherein the pair of output half shafts (60) are coaxially arranged, the differential (61) is arranged between the pair of output half shafts (60), and a power output part of the differential (61) is connected to the output half shafts (60); the first intermediate shaft transmission mechanism and the second intermediate shaft transmission mechanism are respectively arranged on both sides of the pair of output half shafts (60); and the motor is offset to one side of the pair of output half shafts (60); The first intermediate shaft transmission mechanism comprises: a first intermediate shaft (20) and a first gear (21), a second gear (22) and a fourth gear (24) arranged on the first intermediate shaft (20); the second intermediate shaft transmission mechanism comprises: a second intermediate shaft (30) and a fifth gear (33), a sixth gear (32) and a seventh gear (31) arranged on the second intermediate shaft (30); an eighth gear (52), a ninth gear (62), a tenth gear (43), an eleventh gear (42), a twelfth gear (41) and a thirteenth gear (51) are sleeved on the pair of output half shafts (60); The motor is drivingly connected to the first intermediate shaft (20); The ninth gear (62) is connected to the power input portion of the differential (61) and meshes with the sixth gear (32); the eighth gear (52) meshes with the seventh gear (31); the tenth gear (43) meshes with the fifth gear (33); the eleventh gear (42) meshes with the second gear (22); the twelfth gear (41) meshes with the first gear (21); and the thirteenth gear (51) meshes with the fourth gear (24); The first shift mechanism is capable of switching between a first position, a second position and a third position; in the first position, the tenth gear (43) is coupled to the eleventh gear (42); in the second position, the tenth gear (43) is coupled to the twelfth gear (41); and in the third position, the tenth gear (43), the eleventh gear (42) and the twelfth gear (41) are disconnected from each other; The second shift mechanism is capable of switching between a fourth position, a fifth position, and a sixth position. In the fourth position, the thirteenth gear (51) is coupled to the eighth gear (52). In the fifth position, the thirteenth gear (51) is coupled to the power input portion of the differential (61). In the sixth position, the thirteenth gear (51), the eighth gear (52), and the power input portion of the differential (61) are disconnected from each other.

2. The four-speed electric drive axle according to claim 1, characterized in that: The first intermediate shaft transmission mechanisms are arranged in a pair and are symmetrically distributed on both sides of the pair of output half shafts (60).

3. The four-speed electric drive axle according to claim 1, characterized in that: The second intermediate shaft transmission mechanisms are arranged in a pair and are symmetrically distributed on both sides of the pair of output half shafts (60).

4. The four-speed electric drive axle according to claim 2, characterized in that: The motors are arranged in a pair, and the pair of motors are transmission-connected with a pair of intermediate shaft transmission mechanisms in a one-to-one correspondence.

5. The four-speed electric drive axle according to claim 4, characterized in that: The first intermediate shaft transmission mechanism further comprises a third gear (23) arranged on each of the first intermediate shafts (20), and a fourteenth gear (11) is arranged on the output shaft of each of the motors, the fourteenth gear (11) being meshed with the third gear (23).

6. The four-speed electric drive axle according to claim 1, characterized in that: The pair of output half shafts (60) are respectively a first output half shaft and a second output half shaft, wherein the thirteenth gear (51) and the eighth gear (52) are loosely mounted on the first output half shaft.

7. The four-speed electric drive axle according to claim 6, characterized in that: The tenth gear (43), the eleventh gear (42) and the twelfth gear (41) are all loosely mounted on the second output half shaft.

8. The four-speed electric drive axle according to claim 1, characterized in that: The tenth gear (43) is loosely mounted on the output half shaft (60) via the first intermediate shaft (40), and the thirteenth gear (51) is loosely mounted on the output half shaft (60) via the second intermediate shaft (50).

9. The four-speed electric drive axle according to claim 1, characterized in that: The output shaft of the motor is arranged in parallel with the pair of output half shafts (60).

10. A vehicle, characterized in that: An axle is provided, and the axle is configured as a four-speed electric drive axle as described in any one of claims 1-9.

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