Electric drive axle structure and vehicle having the same

Abstract

The application provides an electric drive axle structure and a vehicle with the same. The electric drive axle structure comprises an electric drive axle housing and two drive structures arranged in the electric drive axle housing, the two drive structures are respectively used for corresponding connection with left and right drive wheels of the vehicle, each drive structure comprises a first planetary gear set, a second planetary gear set, a first gear shifting assembly, a second gear shifting assembly and a drive motor; the first planetary gear set is connected with the second planetary gear set through the first gear shifting assembly and the second gear shifting assembly, so that four gear shifting connections are formed between the first planetary gear set and the second planetary gear set; the output end of the drive motor is connected with the first planetary gear set, so as to input power to the first planetary gear set, and the power is output to the left and right drive wheels through the second planetary gear set. The application solves the problem that the electric drive axle structure in the prior art is difficult to meet the large output torque requirement of the wheel end of a heavy vehicle.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drive axle, in particular to an electric drive axle structure and a vehicle with the same. BACKGROUND

[0002] At present, with the innovation and popularization of new energy technology, as a key component connecting the motor and the wheel, the structural design of the drive axle is facing unprecedented challenges. Especially in the field of heavy vehicles, the market requires higher integration, large speed ratio and volume power density of the electric drive axle to meet the dual demands of high torque and high efficiency of heavy vehicles in complex working conditions. The prior art provides a three-gear electric drive axle structure which can meet the power transmission requirements of the vehicle to a certain extent.

[0003] However, with the rapid development of new energy technology, the application of electric drive axle system in commercial vehicles is becoming more and more widespread, and the market demand for integration, large speed ratio and high volume power density of electric drive axle is increasing. The one-gear speed ratio design of this prior art is too small, resulting in insufficient output torque of the wheel end in heavy vehicle applications. In order to meet the power demand of the wheel end, it is necessary to select high-performance motors with high cost, which not only increases the overall cost of the system, but also brings challenges to the selection and integration of the motor. In addition, the limitations of power flow path and shift strategy limit the economy and efficiency of the vehicle in different working conditions, making it difficult to achieve the best balance between power and economy. SUMMARY

[0004] The main purpose of the present application is to provide an electric drive axle structure and a vehicle with the same to solve the problem that the electric drive axle structure in the prior art cannot meet the large output torque demand of the wheel end of the heavy vehicle.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present application, an electric drive axle structure is provided, which comprises an electric drive axle housing and two drive structures arranged in the electric drive axle housing, the two drive structures are respectively used for corresponding connection with left and right drive wheels of a vehicle, each drive structure comprises: a first planetary gear set and a second planetary gear set; a first shift assembly and a second shift assembly, the first planetary gear set is connected with the second planetary gear set through the first shift assembly and the second shift assembly, so that four gear connections are formed between the first planetary gear set and the second planetary gear set; a drive motor, an output end of the drive motor is connected with the first planetary gear set, so as to input power to the first planetary gear set, and output power to the left and right drive wheels through the second planetary gear set.

[0006] Further, each driving structure further comprises a first switching assembly comprising a first switching piece A, a first switching piece B, a first switching piece C, a first switching piece D and a first switching piece E, the first switching piece A is an electric drive axle housing, the first switching piece B is a second sun gear shaft of the second planetary gear set, the first switching piece C is a second sun gear shaft of the second planetary gear set, the first switching piece D is a first sun gear shaft of the first planetary gear set, and the first switching piece E is a first sun gear shaft of the first planetary gear set.

[0007] Further, the first switching assembly comprises a first motor, a first shift sleeve connected to an output end of the first motor, and two first connecting portions respectively provided on the first shift sleeve, so that the first motor drives the first shift sleeve to drive the two first connecting portions to be connected to corresponding two connecting portions of the first switching piece A, the first switching piece B, the first switching piece C, the first switching piece D and the first switching piece E.

[0008] Further, two first spline teeth are respectively provided on inner surfaces of the first shift sleeve at the two first connecting portions, so as to be respectively engaged with first outer spline teeth on the first switching piece A, the first switching piece B, the first switching piece C, the first switching piece D and the first switching piece E.

[0009] Further, each driving structure further comprises a second switching assembly comprising a second switching piece a, a second switching piece b and a second switching piece c, the second switching piece a is an electric drive axle housing, the second switching piece b is a first sun gear shaft of the first planetary gear set, and the second switching piece c is a second sun gear shaft of the second planetary gear set.

[0010] Further, the second switching assembly comprises a second motor, a second shift sleeve connected to an output end of the second motor, and two second connecting portions respectively provided on the second shift sleeve, so that the second motor drives the second shift sleeve to drive the two second connecting portions to be connected to corresponding two connecting portions of the second switching piece a, the second switching piece b and the second switching piece c.

[0011] Further, two second spline teeth are respectively provided on inner surfaces of the second shift sleeve at the two second connecting portions, so as to be respectively engaged with second outer spline teeth on the second switching piece a, the second switching piece b and the second switching piece c.

[0012] Further, the electric drive axle structure further comprises a differential arranged in the electric drive axle housing, the two second sun gear shafts of the two second planetary gear sets are respectively connected to the differential, and the differential is respectively connected to a left driving wheel and a right driving wheel through two half shafts, so that the power output by the two second planetary gear sets is respectively transmitted to the left driving wheel and the right driving wheel after being reduced by the differential.

[0013] Further, the first planetary gear set comprises: a first ring gear connected with a first ring gear shaft, the first ring gear shaft being connected with the electric drive axle housing; a first planetary gear meshingly connected with the first ring gear; a first carrier, the first planetary gear being arranged on the first carrier, the first carrier being provided with a first carrier shaft, the first carrier shaft being used for being connected with the first shift assembly and the second shift assembly respectively; a first sun gear meshingly connected with the first planetary gear, the first sun gear being provided with a first sun gear shaft, the first sun gear shaft being connected with the output end of the driving motor and used for being connected with the first shift assembly.

[0014] Further, the second planetary gear set comprises: a second ring gear connected with a second ring gear shaft, the second ring gear shaft being used for being connected with the second shift assembly; a second planetary gear meshingly connected with the second ring gear; a second carrier, the second planetary gear being arranged on the second carrier, the second carrier being provided with a second carrier shaft, the second carrier shaft being used for being connected with the first shift assembly; a second sun gear meshingly connected with the second planetary gear, the second sun gear being provided with a second sun gear shaft, the second sun gear shaft being used for being connected with the first shift assembly.

[0015] According to another aspect of the present application, a vehicle is provided, comprising the electric drive axle structure mentioned above.

[0016] The technical scheme of the present application provides an electric drive axle structure, which comprises an electric drive axle housing and two driving structures arranged in the electric drive axle housing, the two driving structures being used for being connected with left and right driving wheels of a vehicle respectively, each driving structure comprising a first planetary gear set, a second planetary gear set, a first shift assembly, a second shift assembly and a driving motor; the first planetary gear set is connected with the second planetary gear set through the first shift assembly and the second shift assembly, so that four shift connections are formed between the first planetary gear set and the second planetary gear set; the output end of the driving motor is connected with the first planetary gear set, so as to input power to the first planetary gear set and output power to the left and right driving wheels through the second planetary gear set.

[0017] In this way, through cooperation of the first shift assembly and the second shift assembly, four shift connections are formed between the first planetary gear set and the second planetary gear set, so that the electric drive axle can provide a wider speed ratio range, better power performance and economy can be achieved, the requirement for motor performance is reduced, more flexible and efficient power transmission can be provided for the vehicle under different working conditions, so as to meet the demand of heavy commercial vehicle wheel end for large output torque, and thus the problem that the electric drive axle structure in the prior art is difficult to meet the demand of heavy vehicle wheel end for large output torque is solved. Moreover, through coaxial arrangement of the two driving structures in the single electric drive axle housing, through combined use of the first planetary gear set and the second planetary gear set, the structure of the electric drive axle is simplified, and the compactness of the system is effectively improved, which is beneficial to layout optimization and space utilization of the vehicle chassis. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings, which form a part of this specification, are included to provide a further understanding of the application, and are incorporated into and constitute a part of this specification. The drawings illustrate one illustrative embodiment of the application and, together with the description, serve to explain the application. In the drawings:

[0019] Figure 1 A first structural schematic diagram provided by an embodiment of the electric drive axle structure according to the application is shown;

[0020] Figure 2 A second structural schematic diagram provided by an embodiment of the electric drive axle structure according to the application is shown.

[0021] Among the above drawings, the following reference signs are included:

[0022] 1, first switching piece A; 2, first switching piece B; 3, first switching piece C; 4, first switching piece D; 5, first switching piece E; 6, second switching piece a; 7, second switching piece b; 8, second switching piece c;

[0023] 10, electric drive axle housing; 11, drive motor;

[0024] 20, drive structure; 21, left drive wheel; 22, right drive wheel;

[0025] 30, first planetary gear set; 31, first ring gear; 32, first planet gear; 33, first carrier; 330, first carrier shaft; 34, first sun gear; 340, first sun gear shaft;

[0026] 40, second planetary gear set; 41, second ring gear; 410, second ring gear shaft; 42, second planet gear; 43, second carrier; 430, second carrier shaft; 44, second sun gear; 440, second sun gear shaft;

[0027] 50, first gear shifting assembly; 51, first motor; 52, first gear shifting sleeve; 520, first connecting part;

[0028] 60, second gear shifting assembly; 61, second motor; 62, second gear shifting sleeve; 620, second connecting part; 70, differential. DETAILED DESCRIPTION

[0029] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0030] In order to solve the problem that the electric drive axle structure in the prior art is difficult to meet the large output torque requirement of the wheel end of a heavy vehicle, the present application provides an electric drive axle structure and a vehicle having the same.

[0031] Reference is made to Figure 1 As shown in the figure, one aspect of the technical solution of the present application provides an electric drive axle structure, which comprises an electric drive axle housing 10 and two drive structures 20 arranged in the electric drive axle housing 10, the two drive structures 20 are respectively used for corresponding connection with a left drive wheel 21 and a right drive wheel 22 of a vehicle, each drive structure 20 comprises a first planetary gear set 30, a second planetary gear set 40, a first gear shifting assembly 50, a second gear shifting assembly 60 and a drive motor 11; the first planetary gear set 30 is connected with the second planetary gear set 40 through the first gear shifting assembly 50 and the second gear shifting assembly 60, so that four gear shifting connections are formed between the first planetary gear set 30 and the second planetary gear set 40; an output end of the drive motor 11 is connected with the first planetary gear set 30, so as to input power to the first planetary gear set 30, and output power to the left drive wheel 21 and the right drive wheel 22 through the second planetary gear set 40.

[0032] According to one aspect of the technical solution of the present application, through the cooperation of the first gear shifting assembly 50 and the second gear shifting assembly 60, four gear shifting connections can be formed between the first planetary gear set 30 and the second planetary gear set 40, so that the electric drive axle can provide a wider speed ratio range, better balance power and economy, reduce the requirement for motor performance, and provide more flexible and efficient power transmission for the vehicle under different working conditions, so as to meet the demand of heavy commercial vehicle wheel end for large output torque, and solve the problem that the electric drive axle structure in the prior art cannot meet the demand of heavy vehicle wheel end for large output torque. Moreover, by integrating the two drive structures 20 in the single electric drive axle housing 10 in the coaxial structure, and by using the combination of the first planetary gear set 30 and the second planetary gear set 40, not only the structure of the electric drive axle is simplified, but also the compactness of the system is effectively improved, which is beneficial to the layout optimization and space utilization of the vehicle chassis.

[0033] In the present embodiment, the drive motor 11 is a large-torque and high-power motor with a certain hollow degree; the first planetary gear set 30 and the second planetary gear set 40 are both NWG planetary gear sets; the sun gear shafts of the first planetary gear set 30 and the second planetary gear set 40 are both hollow shafts, and the first planetary carrier shaft 330 of the first planetary gear set 30, the second sun gear shaft 440 and the second planetary carrier shaft 430 of the second planetary gear set 40 all pass through the first sun gear shaft 340 of the first planetary gear set 30.

[0034] As Figure 1As shown, each driving structure 20 further comprises a first switching assembly, which comprises a first switching piece A1, a first switching piece B2, a first switching piece C3, a first switching piece D4 and a first switching piece E5. The first switching piece A1 is the electric drive bridge housing 10, the first switching piece B2 is the second planet carrier shaft 430 of the second planetary gear set 40, the first switching piece C3 is the second sun gear shaft 440 of the second planetary gear set 40, the first switching piece D4 is the first planet carrier shaft 330 of the first planetary gear set 30, and the first switching piece E5 is the first sun gear shaft 340 of the first planetary gear set 30. In this way, the first planetary gear set 30 and the second planetary gear set 40 inside the electric drive bridge are connected through different switching pieces, which can realize more complex power transmission paths and gear shifting modes. This helps the vehicle to achieve optimal power distribution and torque output under various driving conditions, improves the driving experience and overall performance of the vehicle, and thus the optimal gear can be selected according to the real-time running state and driving demand of the vehicle to improve the efficiency and economy of power output.

[0035] Specifically, the first gear shifting assembly 50 comprises a first motor 51 and a first gear shifting sleeve 52. The first gear shifting sleeve 52 is connected to the output end of the first motor 51, and two first connecting portions 520 are respectively arranged on the first gear shifting sleeve 52, so that the first motor 51 drives the first gear shifting sleeve 52 to drive the two first connecting portions 520 to be connected with the corresponding two connecting portions of the first switching piece A1, the first switching piece B2, the first switching piece C3, the first switching piece D4 and the first switching piece E5. In this way, through the switching of the two first connecting portions 520 on the first gear shifting sleeve 52, the first planetary gear set 30 and the second planetary gear set 40 are coupled and connected in different transmission paths, and thus the power transmission path can be flexibly selected according to the real-time demand of the vehicle, thereby improving the power transmission efficiency while reducing energy loss, especially in heavy vehicle applications requiring high torque output.

[0036] Specifically, the first shift sleeve 52 is provided with two first spline teeth on the inner surfaces of the two first connecting portions 520 respectively, for corresponding meshing connection with the first outer spline on the first shift member A1, the first shift member B2, the first shift member C3, the first shift member D4 and the first shift member E5 respectively. In this way, the first shift sleeve 52 can be accurately connected with different first shift members through the meshing of the spline teeth and the outer spline, ensuring the accuracy and reliability of gear shifting. This mechanical connection mode provides a more stable and direct power transmission path compared to other forms of connection. Through the connection of the first shift sleeve 52, different power coupling connection modes between the first planetary gear set 30 and the second planetary gear set 40 can be more intuitively realized, the power can be accurately transmitted from the first planetary gear set 30 to the second planetary gear set 40, and power distribution can be performed at different speed ratios, improving the adaptability and efficiency of the electric drive axle under complex working conditions.

[0037] As shown in Figure 1 The driving structure 20 further includes a second shift assembly, which includes a second shift member a6, a second shift member b7 and a second shift member c8. The second shift member a6 is the electric drive axle housing 10, the second shift member b7 is the first carrier shaft 330 of the first planetary gear set 30, and the second shift member c8 is the second ring gear shaft 410 of the second planetary gear set 40. In this way, the second shift assembly provides an additional power path selection, which can intelligently switch the power transmission path from the driving motor 11 to the wheels according to the actual working condition of the vehicle. In combination with the first shift sleeve 52, the electric drive axle can realize power transmission at different speed ratios by controlling the connection of the two second connecting portions 620 of the second shift sleeve 62 with different second shift members, thereby reducing the requirements and design of the performance of the driving motor 11, and improving the driving efficiency while ensuring the power performance of the vehicle.

[0038] Specifically, the second shift assembly 60 includes a second motor 61 and a second shift sleeve 62. The second shift sleeve 62 is connected to the output end of the second motor 61, and the second shift sleeve 62 is provided with two second connecting portions 620 respectively, so that the second motor 61 drives the second shift sleeve 62 to drive the two second connecting portions 620 to connect with the corresponding two of the second shift member a6, the second shift member b7 and the second shift member c8 respectively. In this way, the plurality of second shift members correspond to the structures in the first planetary gear set 30 and the second planetary gear set 40 respectively, so that the two second connecting portions 620 on the second shift sleeve 62 are selectively connected with two second shift members, so that the electric drive axle can intelligently switch the connection state according to the driving demand of the vehicle, realize the power transmission path at multiple speed ratios, and improve the flexibility.

[0039] Specifically, the second shift sleeve 62 is provided with second spline teeth on the inner surfaces of the two second connecting portions 620, respectively, for meshing connection with the second outer spline on the second switching piece a6, or the second switching piece b7 or the second switching piece c8, to realize different power coupling between the first planetary gear set 30 and the second planetary gear set 40. In this way, through the meshing of the second spline teeth and the second outer spline, the accuracy and stability of the connection of the second shift sleeve 62 with different second switching pieces when switching the power path are ensured. This precise mechanical connection mode reduces unnecessary energy loss in the process of power transmission, improves transmission efficiency. At the same time, it helps to optimize the internal structure layout of the entire electric drive axle, making it more compact, reducing space occupation, and facilitating vehicle chassis design and installation.

[0040] According to the architecture design of the present application, the functions of different gears are as follows:

[0041] Gear First shift sleeve Second shift sleeve 1st gear C, D a, c 2nd gear A, C b, c 3rd gear C, E b, c 4th gear B, E Neutral

[0042] In first gear, the two first connecting portions 520 of the first shift sleeve 52 interlock the first switching piece C3 and the first switching piece D4, that is, the first planet carrier shaft 330 is interlocked with the second sun gear shaft 440. The two second connecting portions 620 of the second shift sleeve 62 interlock the second switching piece a6 and the second switching piece c8, that is, the second ring gear shaft 410 is connected with the electric drive axle housing 10 to realize fixation. The output power of the drive motor 11 is output to the second sun gear shaft 440 through the first planetary gear set 30 after deceleration, and the power is output to the second planet carrier shaft 430 after deceleration through the second planetary gear set 40. The second planet carrier shaft 430 is the output to output the power to the differential 70, and the differential 70 outputs the power to the left drive wheel 21 and the right drive wheel 22 after deceleration on both sides, thereby completing the power flow transmission in first gear, and realizing a large speed ratio in first gear, which can reduce the performance requirements of the drive motor 11 under the condition of meeting the wheel end power performance.

[0043] In second gear, the two first connecting portions 520 of the first shift sleeve 52 interlock the first switching piece A1 and the first switching piece C3, and the second sun gear shaft 440 is fixedly connected with the electric drive axle housing 10, and the second sun gear shaft 440 is constrained. The two second connecting portions 620 of the second shift sleeve 62 interlock the second switching piece b7 and the second switching piece c8, and the first planet carrier shaft 330 is power output to the second ring gear shaft 410. The second ring gear 41 of the second planetary gear set 40 is taken as input, the second sun gear 44 is fixed, and the second planet carrier 43 is taken as output. The power of the drive motor 11 is decelerated through the first planetary gear set 30 and the second planetary gear set 40, and then output to the differential 70, and finally to the left drive wheel 21 and the right drive wheel 22 after wheel edge deceleration, thereby completing the power flow transmission in second gear.

[0044] In the third gear, the two first connecting parts 520 of the first shift sleeve 52 interlock the first switching piece B2 and the first switching piece E5, and the two second connecting parts 620 of the second shift sleeve 62 are in the neutral position. At this time, the first planetary gear set 30 and the second planetary gear set 40 do not participate in power transmission, and the power of the driving motor 11 is directly output to the differential 70, and then transmitted to the left drive wheel 21 and the right drive wheel 22 after being reduced by the wheel side reduction.

[0045] In the fourth gear, the two first connecting parts 520 of the first shift sleeve 52 interlock the first switching piece B2 and the first switching piece E5, and the two second connecting parts 620 of the second shift sleeve 62 are in the neutral position. At this time, the first planetary gear set 30 and the second planetary gear set 40 do not participate in power transmission, and the power of the driving motor 11 is directly output to the differential 70, and then transmitted to the left drive wheel 21 and the right drive wheel 22 after being reduced by the wheel side reduction.

[0046] As shown in Figure 1 , the electric drive axle structure further includes a differential 70, which is arranged in the electric drive axle housing 10. The second carrier shafts 430 of the two second planetary gear sets 40 are respectively connected with the differential 70, and the differential 70 is respectively connected with the left drive wheel 21 and the right drive wheel 22 through two half shafts, so that the power output by the two second planetary gear sets 40 is respectively transmitted to the left drive wheel 21 and the right drive wheel 22 after being reduced by the differential 70. In this way, the differential 70 can automatically adjust and distribute the power output from the second planetary gear set 40 according to the difference in frictional force between the left drive wheel 21 and the right drive wheel 22 and the ground, so as to ensure that the other side of the wheel can obtain sufficient torque when the vehicle turns or one side of the wheel slips, thereby maintaining the stability and controllability of the vehicle. Through the reduction effect of the differential 70, the power output by the second planetary gear set 40 can be further optimized to adapt to the torque demand of the vehicle under different working conditions, especially when the vehicle is driving at low speed or climbing, a greater torque can be provided to improve the driving efficiency.

[0047] In another embodiment of the present application, as shown in Figure 2 , the differential 70 is cancelled, the second switching piece a6 is the first carrier shaft 330 of the first planetary gear set 30, the second switching piece b7 is the second ring gear shaft 410 of the second planetary gear set 40, and the second switching piece c8 is the electric drive axle housing 10. The differential function can be realized through the vehicle strategy, thereby optimizing the layout space and design cost.

[0048] In the present embodiment, the first planetary gear set 30 includes a first ring gear 31, a first planet gear 32, a first carrier 33, and a first sun gear 34. The first ring gear 31 is connected with a first ring gear shaft, and the first ring gear shaft is connected with the electric drive axle housing 10. The first planet gear 32 is meshingly connected with the first ring gear 31. The first planet gear 32 is arranged on the first carrier 33, and the first carrier 33 is provided with a first carrier shaft 330 for connecting with the first shift assembly 50 and the second shift assembly 60 respectively. The first sun gear 34 is meshingly connected with the first planet gear 32, and the first sun gear 34 is provided with a first sun gear shaft 340 for connecting with the output end of the driving motor 11 and the first shift assembly 50. With the above arrangement, the first planetary gear set 30 can efficiently convert and transmit power at different speed ratios. When the first sun gear 34 is used as the power input and the first carrier 33 is used as the output, the effect of speed reduction and torque increase can be achieved. Conversely, when the first carrier 33 is used as the input and the first sun gear 34 is used as the output, the effect of speed increase and torque reduction can be achieved, thereby adapting to different driving conditions. Moreover, the compact design of the first planetary gear set 30 enables it to be closely integrated with other components such as the electric drive axle housing 10 and the driving motor 11, thereby reducing the space occupation and facilitating the overall layout of the electric drive axle and the design optimization of the vehicle chassis.

[0049] In the present embodiment, the second planetary gear set 40 includes a second ring gear 41, a second planet gear 42, a second carrier 43, and a second sun gear 44. The second ring gear 41 is connected with a second ring gear shaft 410 for connecting with the second shift assembly 60. The second planet gear 42 is meshingly connected with the second ring gear 41. The second planet gear 42 is arranged on the second carrier 43, and the second carrier 43 is provided with a second carrier shaft 430 for connecting with the first shift assembly 50. The second sun gear 44 is meshingly connected with the second planet gear 42, and the second sun gear 44 is provided with a second sun gear shaft 440 for connecting with the first shift assembly 50. With the above arrangement, the second carrier shaft 430 is connected with the first shift assembly 50, and the second ring gear shaft 410 is connected with the second shift assembly 60, so that the power can be distributed between the two planetary gear sets. In some conditions, a part of the power can be directly transmitted to the differential 70 through the second planetary gear set 40, and another part of the power can be converted through additional gears to provide more flexible driving modes for the vehicle. At the same time, the second planetary gear set 40 is compactly integrated in the electric drive axle housing 10 and closely cooperates with the first planetary gear set 30, the differential 70, and the shift assemblies, thereby reducing the additional transmission devices and making the entire drive axle system more compact, which is conducive to the layout optimization of the vehicle chassis and reduces the weight, thereby improving the handling and fuel economy of the vehicle.

[0050] According to another aspect of the technical solution of the present application, a vehicle is provided, which comprises the electric drive axle structure mentioned above. In this way, the power flow path can be intelligently adjusted according to the driving state of the vehicle through the electric drive axle structure, so that the driving motor 11 can maintain high-efficiency operation in different gears, unnecessary energy loss is reduced, energy utilization efficiency is improved, driving range per charge is prolonged, and operating cost is reduced. In addition, additional speed reduction and torque increase effect can be provided when large torque output is required by the vehicle, which significantly enhances the load capacity and traction of the vehicle and enhances the adaptability of heavy vehicles.

[0051] From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects:

[0052] The electric drive axle structure comprises an electric drive axle housing 10 and two driving structures 20 arranged in the electric drive axle housing 10, the two driving structures 20 are respectively used for corresponding connection with a left driving wheel 21 and a right driving wheel 22 of the vehicle, each driving structure 20 comprises a first planetary gear set 30, a second planetary gear set 40, a first gear shifting assembly 50, a second gear shifting assembly 60 and a driving motor 11; the first planetary gear set 30 is connected with the second planetary gear set 40 through the first gear shifting assembly 50 and the second gear shifting assembly 60, so that four gear connections are formed between the first planetary gear set 30 and the second planetary gear set 40; the output end of the driving motor 11 is connected with the first planetary gear set 30, so as to input power to the first planetary gear set 30, and output power to the left driving wheel 21 and the right driving wheel 22 through the second planetary gear set 40. In this way, through the cooperation of the first gear shifting assembly 50 and the second gear shifting assembly 60, four gear connections can be formed between the first planetary gear set 30 and the second planetary gear set 40, so that the electric drive axle can provide a wider speed ratio range, better balance power and economy, reduce the requirement for motor performance, and provide more flexible and efficient power transmission for the vehicle under different working conditions, so as to meet the demand of heavy commercial vehicle wheel end for large output torque, and thus solve the problem that the electric drive axle structure in the prior art cannot meet the demand of heavy vehicle wheel end for large output torque. In addition, by integrating the two driving structures 20 in the single electric drive axle housing 10 in the coaxial architecture, and by using the combination of the first planetary gear set 30 and the second planetary gear set 40, the structure of the electric drive axle is simplified, and the compactness of the system is effectively improved, which is beneficial to the layout optimization and space utilization of the vehicle chassis.

[0053] It should be noted that the terms used herein are only intended to describe specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that, when the terms "comprise" and / or "include" are used in the specification, there is a presence of the features, steps, operations, devices, components and / or combinations thereof.

[0054] The foregoing is considered as illustrative only of the principles of the application. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the application to the exact construction and practice described. Accordingly, all such variations are intended to be included within the scope of the present application as defined in the following claims, along with full equivalents thereof.

[0055] In the description of the present application, it is to be understood that the orientation or positional relationships indicated by terms such as "front", "back", "up", "down", "left", "right", "lateral", "vertical", "horizontal", "top", "bottom", and the like are generally based on the orientation or positional relationships shown in the drawings, and are merely intended to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be construed as limiting the scope of protection of the present application. The orientation terms "inner", "outer" refer to the inner and outer relative to the contour of the components themselves.

[0056] For the convenience of description, spatial relative terms such as "above", "upper", "top", "up", and the like can be used herein to describe the spatial relationship of one device or feature to another device or feature as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawings is inverted, the device described as "above" or "on" the other device or structure will be positioned "below" or "under" the other device or structure. Thus, the exemplary term "above" can include both the "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations) and the spatial relative descriptions used herein will be interpreted accordingly.

[0057] In addition, it should be noted that the use of the terms "first", "second", and the like do not have a special meaning, and therefore should not be construed as limiting the scope of protection of the present application, unless otherwise stated.

[0058] The above merely provides the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. An electric drive axle structure, comprising an electric drive axle housing (10) and two drive structures (20) arranged in the electric drive axle housing (10), the two drive structures (20) being respectively arranged to be connected to a left drive wheel (21) and a right drive wheel (22) of a vehicle, characterized in that, Each of the drive structures (20) comprises: a first planetary gear set (30) and a second planetary gear set (40); a first shift assembly (50) and a second shift assembly (60), the first planetary gear set (30) being connected with the second planetary gear set (40) through the first shift assembly (50) and the second shift assembly (60) respectively, so that four shift connections are formed between the first planetary gear set (30) and the second planetary gear set (40); a drive motor (11), an output end of the drive motor (11) being connected with the first planetary gear set (30) for inputting power to the first planetary gear set (30) and outputting power to the left drive wheel (21) and the right drive wheel (22) through the second planetary gear set (40); Each of the drive structures (20) further comprises a first switching assembly comprising a first switching piece A (1), a first switching piece B (2), a first switching piece C (3), a first switching piece D (4) and a first switching piece E (5), the first switching piece A (1) being the electric drive axle housing (10), the first switching piece B (2) being a second planet carrier shaft (430) of the second planetary gear set (40), the first switching piece C (3) being a second sun gear shaft (440) of the second planetary gear set (40), the first switching piece D (4) being a first planet carrier shaft (330) of the first planetary gear set (30), and the first switching piece E (5) being a first sun gear shaft (340) of the first planetary gear set (30). Each of the drive structures (20) further comprises a second switching assembly comprising a second switching piece a (6), a second switching piece b (7) and a second switching piece c (8), the second switching piece a (6) being the electric drive axle housing (10), the second switching piece b (7) being the first planet carrier shaft (330) of the first planetary gear set (30), and the second switching piece c (8) being a second ring gear shaft (410) of the second planetary gear set (40).

2. The electric drive axle structure according to claim 1, characterized in that The first shift assembly (50) comprises: a first motor (51); a first shift sleeve (52) connected with an output end of the first motor (51), two first connecting portions (520) being respectively arranged on the first shift sleeve (52), so that the first motor (51) drives the first shift sleeve (52) to drive the two first connecting portions (520) to be connected with corresponding two of the first switching piece A (1), the first switching piece B (2), the first switching piece C (3), the first switching piece D (4) and the first switching piece E (5).

3. The electric drive axle structure according to claim 2, characterized in that Two first spline teeth are respectively arranged on inner surfaces of the first shift sleeve (52) at the two first connecting portions (520), for being respectively engaged with first outer splines on the first switching piece A (1), the first switching piece B (2), the first switching piece C (3), the first switching piece D (4) and the first switching piece E (5).

4. The electric drive axle structure according to claim 1, characterized in that, The second shift assembly (60) comprises: a second motor (61); A second shift sleeve (62) is connected with the output end of the second motor (61), two second connecting portions (620) are respectively arranged on the second shift sleeve (62), so that the second motor (61) drives the second shift sleeve (62) to drive the two second connecting portions (620) to be connected with two corresponding connecting portions of the second switching part a (6), the second switching part b (7) and the second switching part c (8).

5. The electric drive axle structure according to claim 4, characterized in that Second spline teeth are arranged on the inner surfaces of the second shift sleeve (62) at the two second connecting portions (620), and are respectively used for meshing connection with the second outer spline on the second switching part a (6), the second switching part b (7) and the second switching part c (8).

6. The electric drive axle structure according to claim 1, characterized in that, The electric drive axle structure further comprises: A differential (70) is arranged in the electric drive axle housing (10), the second planet carrier shafts (430) of the two second planetary gears (40) are respectively connected with the differential (70), and the differential (70) is respectively connected with the left drive wheel (21) and the right drive wheel (22) through two half shafts, so that the power output by the two second planetary gears (40) is respectively transmitted to the left drive wheel (21) and the right drive wheel (22) after being decelerated by the differential (70).

7. The electric drive axle structure according to claim 1, characterized in that, The first planetary gear (30) comprises: A first ring gear (31) is connected with a first ring gear shaft, and the first ring gear shaft is connected with the electric drive axle housing (10); A first planet wheel (32) is meshingly connected with the first ring gear (31); A first planet carrier (33) is arranged on the first planet carrier (33), a first planet carrier shaft (330) is arranged on the first planet carrier (33), and the first planet carrier shaft (330) is used for being respectively connected with the first shift assembly (50) and the second shift assembly (60); A first sun gear (34) is meshingly connected with the first planet wheel (32), a first sun gear shaft (340) is arranged on the first sun gear (34), and the first sun gear shaft (340) is connected with the output end of the drive motor (11) and used for being connected with the first shift assembly (50).

8. The electric drive axle structure according to claim 1, characterized in that, The second planetary gear (40) comprises: A second ring gear (41) is connected with a second ring gear shaft (410), and the second ring gear shaft (410) is used for being connected with the second shift assembly (60); A second planet wheel (42) is meshingly connected with the second ring gear (41); A second planet carrier (43) is arranged on the second planet carrier (43), a second planet carrier shaft (430) is arranged on the second planet carrier (43), and the second planet carrier shaft (430) is used for being connected with the first shift assembly (50); A second sun gear (44) is connected in meshing connection with the second planetary gear (42), a second sun gear shaft (440) is arranged on the second sun gear (44), and the second sun gear shaft (440) is used to be connected with the first gear shifting assembly (50).

9. A vehicle comprising an electric drive axle arrangement, characterized in that The electric drive axle structure is the electric drive axle structure according to any one of claims 1 to 8.

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