Electric drive axle assembly and vehicle with same

Abstract

The invention provides an electric drive axle assembly and a vehicle with the same, and relates to the technical field of vehicles. The electric drive axle assembly comprises a drive motor; the differential mechanism is connected with a vehicle wheel end through a half shaft; the first planetary gear train at least comprises a first sun gear and a first planetary gear, the first sun gear is connected with an output shaft of the driving motor, and the first planetary gear is arranged on a first planetary carrier; the second planetary gear train at least comprises a second sun gear and a second planetary gear, the second planetary gear is arranged on a second planetary carrier, and the output end of the second planetary carrier is connected with the differential mechanism; and the transmission gear system is connected with the first planetary gear system and the second planetary gear system, and the transmission gear system is used for transmitting power of any one of the first planet carrier and the first sun gear to any one of the second planet carrier and the second sun gear. The problems that an electric drive axle of a commercial vehicle is large in size and unreasonable in gear-speed ratio setting are solved.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to an electric drive axle assembly and a vehicle having the same. Background Art

[0002] Currently, there are many configurations of electric drive axles used in heavy-duty commercial vehicles, one of which is a parallel shaft arrangement or an external motor. The so-called parallel shaft means that the output shaft of the drive motor and the output shaft of the wheel end are arranged in parallel, and heavy-duty electric drive axles have gradually developed from the initial two gears to multiple gears.

[0003] In the prior art, 4 gears are achieved by using 2 sets of shifting mechanisms, with fewer shaft systems, smoother gear power flow planning, fewer transmission levels, and high gears are all three-stage transmissions. The designed torque capacity is large, power control is convenient, and the design scheme is more modular, but the gear transmission path is long and the gear efficiency is low; or 4 gears are achieved by using 2 sets of shifting mechanisms. The shifting structure is simple and easy to implement, and can be expanded to a dual-motor form with a centered center of mass, but there are only 3 levels of reduction transmission, the speed ratio is limited, and the vehicle requirements of high torque conditions in low gear and high speed in high gear cannot be taken into account at the same time.

[0004] Currently, no effective solution has been proposed for the above-mentioned technical problems. Summary of the invention

[0005] The main purpose of the present invention is to provide an electric drive axle assembly and a vehicle having the same, so as to solve the problems in the prior art that the electric drive axle of a commercial vehicle is large in size and the gear ratio is unreasonable.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided an electric drive axle assembly, comprising: a drive motor; a differential, the differential being connected to the vehicle wheel end through a half shaft; a first planetary gear system, the first planetary gear system at least comprising a first sun gear and a first planetary gear, the first sun gear being connected to the output shaft of the drive motor, and the first planetary gear being arranged on the first planet carrier; a second planetary gear system, the second planetary gear system at least comprising a second sun gear and a second planetary gear, the second planetary gear being arranged on the second planet carrier, and the output end of the second planet carrier being connected to the differential; a transmission gear system, the transmission gear system being connected to the first planetary gear system and the second planetary gear system, and the transmission gear system being used to transmit power of any one of the first planet carrier and the first sun gear to any one of the second planet carrier and the second sun gear.

[0007] Further, the transmission gear train includes a first transmission gear assembly, a second transmission gear assembly, a third transmission gear assembly, a first shifting assembly, and a second shifting assembly. The first transmission gear assembly is connected to the output end of the first planet carrier. The third transmission gear assembly is connected to the output end of the first sun gear. The second transmission gear assembly is selectively connected to either the first transmission gear assembly or the third transmission gear assembly through the first shifting assembly. The second transmission gear assembly is selectively connected to either the second planet carrier or the second sun gear through the second shifting assembly.

[0008] Further, the first transmission gear assembly includes: a first driving gear connected to the output end of the first planet carrier; a first driven gear meshing with the first driving gear; wherein, the first driving gear is configured to transmit the power of the first planet carrier to the first driven gear.

[0009] Further, the third transmission gear assembly includes: a third driving gear connected to the first sun gear; a third driven gear meshing with the third driving gear; wherein, the third driving gear is configured to transmit the power of the first sun gear to the third driven gear.

[0010] Further, the first shifting assembly includes: a shifting gear drivingly connected to the second transmission gear assembly; a first shifting sleeve slidably meshing with the shifting gear. The first shifting sleeve has a first gear state meshing with the first driven gear and a second gear state meshing with the third driven gear. When the first shifting sleeve is in the first gear state, the first shifting sleeve transmits the power on the first driven gear to the shifting gear. When the first shifting sleeve is in the second gear state, the first shifting sleeve transmits the power on the third driven gear to the shifting gear.

[0011] Further, the second transmission gear assembly includes: a second driving gear drivingly connected to the shifting gear; a second driven gear meshing with the second driving gear; wherein, the second driving gear is configured to transmit the power of the shifting gear to the second driven gear.

[0012] Further, the second shifting assembly includes: a second shifting sleeve slidably meshing with the second driven gear. The second shifting sleeve has a third gear state drivingly connected to the input power of the second sun gear and a fourth gear state drivingly connected to the second planet carrier. When the second shifting sleeve is in the third gear state, the second shifting sleeve transmits the power on the second driven gear to the second sun gear. When the second shifting sleeve is in the fourth gear state, the second shifting sleeve transmits the power on the second driven gear to the second planet carrier.

[0013] Further, the second planetary gear system further includes a transmission gear coaxially arranged with the second sun gear. When the second shifting sleeve is in the third gear state, the second shifting sleeve meshes with the transmission gear to transmit the power on the second driven gear to the second sun gear.

[0014] Further, the electric drive axle assembly further includes a power take-off, and the power take-off meshes with the second driven gear through a power take-off gear. The power take-off is used to extract power from the second driven gear.

[0015] According to another aspect of the present invention, a vehicle is provided, and the vehicle has an electric drive axle assembly, and the electric drive axle assembly is the above-mentioned electric drive axle assembly.

[0016] Applying the technical solution of the present invention, the output shaft of the drive motor can selectively output power to the first planetary gear system or directly output power to the transmission gear system. The power can achieve primary deceleration through the first planetary gear system. The transmission gear system can selectively transmit the power to the second sun gear in the second planetary gear system or transmit the power to the second planet carrier in the second planetary gear system. The power can also achieve primary deceleration through the second planetary gear system. By selecting the connection relationship between the transmission gear system and the first planetary gear system and the second planetary gear system, it is possible to adjust and construct a reasonable deceleration ratio and speed ratio. At the same time, combined with the deceleration ratio set in the transmission gear system, the power transmitted to the differential can fully take into account the requirements of large torque in low gears and high vehicle speed in high gears, and different deceleration levels in various gear modes of the vehicle can be achieved, improving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The specification drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0018] Figure 1 shows a schematic structural diagram of an embodiment of an electric drive axle assembly according to the present invention;

[0019] Figure 2 shows a schematic diagram of the power transmission path of the first embodiment of the electric drive axle assembly according to the present invention;

[0020] Figure 3 shows a schematic diagram of the power transmission path of the second embodiment of the electric drive axle assembly according to the present invention;

[0021] Figure 4 shows a schematic diagram of the power transmission path of the third embodiment of the electric drive axle assembly according to the present invention;

[0022] Figure 5 shows a schematic diagram of the power transmission path of the fourth embodiment of the electric drive axle assembly according to the present invention.

[0023] Among them, the above-mentioned drawings include the following reference numerals:

[0024] 10. Driving motor;

[0025] 20. Differential; 21. Half shaft; 22. Wheel end;

[0026] 30. First planetary gear train; 31. First sun gear; 32. First planetary gear; 33. First planetary carrier;

[0027] 40. Second planetary gear train; 41. Second sun gear; 42. Second planetary gear; 43. Second planetary carrier; 44. Transmission gear;

[0028] 51. First transmission gear assembly; 511. First driving gear; 512. First driven gear; 52. Second transmission gear assembly; 521. Second driving gear; 522. Second driven gear; 53. Third transmission gear assembly; 531. Third driving gear; 532. Third driven gear; 54. First shifting assembly; 541. Shifting gear; 542. First shifting sleeve; 55. Second shifting assembly; 551. Second shifting sleeve;

[0029] 60. Power take-off; 61. Power take-off gear. Detailed implementation manners

[0030] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0031] It should be noted that the terms used herein are only for describing the specific implementation manners and are not intended to limit the exemplary embodiments according to this application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations.

[0032] It should be noted that the terms "first", "second", etc. in the description, claims and the above-mentioned drawings of this application are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances, so that the embodiments of this application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that comprises a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0033] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many different forms and should not be construed as being limited only to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of the present application is thorough and complete, and the concept of these exemplary embodiments is fully conveyed to those of ordinary skill in the art. In the drawings, for clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to denote the same devices, and thus their description will be omitted.

[0034] Combined with Figures 1 to 5 As shown, according to a specific embodiment of the present application, an electric drive axle assembly is provided.

[0035] Specifically, as Figure 1 shown, the electric drive axle assembly includes a drive motor 10, a differential 20, a first planetary gear train 30, a second planetary gear train 40, and a transmission gear train; the differential 20 is connected to the vehicle wheel end 22 through a half shaft 21; the first planetary gear train 30 includes at least a first sun gear 31 and a first planetary gear 32, the first sun gear 31 is connected to the output shaft of the drive motor 10, and the first planetary gear 32 is disposed on a first planetary carrier 33; the second planetary gear train 40 includes at least a second sun gear 41 and a second planetary gear 42, the second planetary gear 42 is disposed on a second planetary carrier 43, and the output end of the second planetary carrier 43 is connected to the differential 20; the transmission gear train is connected to the first planetary gear train 30 and the second planetary gear train 40, and the transmission gear train is used to transmit the power of any one of the first planetary carrier 33 and the first sun gear 31 to any one of the second planetary carrier 43 and the second sun gear 41.

[0036] Applying the technical solution of this embodiment, the output shaft of the drive motor 10 can selectively output power to the first planetary gear train 30 or directly output power to the transmission gear train. The power can achieve primary reduction through the first planetary gear train 30. The transmission gear train can selectively transmit power to the second sun gear 41 in the second planetary gear train 40 or transmit power to the second planet carrier 43 in the second planetary gear train 40. The power can also achieve primary reduction through the second planetary gear train 40. By selecting the connection relationship between the transmission gear train and the first planetary gear train 30 and the second planetary gear train 40, the reasonable reduction stage number and speed ratio size can be adjusted and constructed. At the same time, combined with the reduction stage number set in the transmission gear train, the power transmitted to the differential 20 can fully take into account the low gear high torque demand and the high gear high vehicle speed demand, realizing different reduction levels in various gear modes of the vehicle and improving the efficiency.

[0037] It should be noted that the gear radius and tooth speed ratio between the first sun gear 31 and the first planetary gear 32 in the first planetary gear train 30 can be adjusted according to the specific vehicle and the setting of the specific reduction level, so that the power output from the first sun gear 31 or the first planet carrier 33 meets the preset output requirements; the gear radius and tooth speed ratio between the second sun gear 41 and the second planetary gear 42 in the second planetary gear train 40 can also be adjusted according to the specific vehicle and the setting of the specific reduction level, so that the power transmitted from the second sun gear 41 to the second planetary gear 42 is decelerated according to the preset level, and then the power that meets the requirements is selected and output to the differential 20.

[0038] In an exemplary embodiment of the present application, the first planetary gear train 30 outputs the power after primary reduction by the planetary gear through the first planet carrier 33, and the second planetary gear train 40 outputs the power after primary reduction by the planetary gear through the second planet carrier 43.

[0039] In another embodiment of the present application, the first planetary gear train 30 can directly output the power of the engine through the first sun gear 31.

[0040] Specifically, as Figure 1As shown in the figure, the transmission gear train includes a first transmission gear assembly 51, a second transmission gear assembly 52, a third transmission gear assembly 53, a first shift assembly 54, and a second shift assembly 55. The first transmission gear assembly 51 is connected to the output end of the first planet carrier 33. The third transmission gear assembly 53 is connected to the output end of the first sun gear 31. The second transmission gear assembly 52 is selectively connected to either the first transmission gear assembly 51 or the third transmission gear assembly 53 through the first shift assembly 54. The second transmission gear assembly 52 is selectively connected to either the second planet carrier 43 or the second sun gear 41 through the second shift assembly 55. The first transmission gear assembly 51 is directly connected to the output end of the first planet carrier 33. The power output by the driving motor 10 is transmitted to the first planet gear 32 through the first sun gear 31 after deceleration. The first planet gear 32 can transmit the power to the first transmission gear assembly 51, and the first transmission gear assembly 51 can perform primary deceleration on the power. The third transmission gear assembly 53 is directly fixedly connected to the first sun gear 31. The power output by the driving motor 10 can be directly transmitted to the third transmission gear assembly 53 through the first sun gear 31, and the third transmission gear assembly 53 can perform primary deceleration on the power. The first shift assembly 54 is disposed between the first transmission gear assembly 51 and the third transmission gear assembly 53. The first shift assembly 54 can be selectively connected to the first transmission gear assembly 51 or the third transmission gear assembly 53, so as to realize the selection of performing secondary deceleration or primary deceleration on the output power of the driving motor 10.

[0041] In this embodiment, the first shift assembly 54 can selectively output the power on the first transmission gear assembly 51 or the third transmission gear assembly 53 to the second transmission gear assembly 52. The second transmission gear assembly 52 can perform primary deceleration on the power again. The second transmission gear assembly 52 transmits the decelerated power through the second shift assembly 55 and can be selectively connected to the second planet carrier 43 or the second sun gear 41. Since the output end of the second planet carrier 43 is connected to the differential 20, the power on the second planet carrier 43 can be directly transmitted to the differential 20, and the differential 20 then transmits the power to the wheel end 22 through the half shaft 21. Then the second shift assembly 55 can selectively transmit the power directly to the second planet carrier 43 or select to transmit the power to the second sun gear 41. The second sun gear 41 and the second planet gear 42 perform primary deceleration on the power and then transmit it to the second planet carrier 43, that is, the selection of the last-stage deceleration is realized.

[0042] As can be seen from the above embodiments, by switching the power output path through the first shifting component 54 and the second shifting component 55, the switching of different reduction levels from a total of two-stage reduction to four-stage reduction can be achieved, greatly enriching the gear configuration, meeting the power requirements under different driving conditions, realizing the power distribution of multiple gears, and ensuring that the drive motor can operate in its most efficient operating range whether in the case of low-speed high torque or high-speed cruising. Furthermore, the driving performance and energy utilization efficiency of the vehicle are improved. At the same time, the system can select the power transmission path with the least resistance and the highest efficiency according to the actual working conditions, ensuring that the motor efficiency and the overall efficiency of the electric drive axle can be maximized throughout the driving range.

[0043] Furthermore, the first transmission gear assembly 51 includes a first driving gear 511 and a first driven gear 512. The first driving gear 511 is connected to the output end of the first planet carrier 33; the first driven gear 512 meshes with the first driving gear 511; wherein, the first driving gear 511 is used to transmit the power of the first planet carrier 33 to the first driven gear 512. In this embodiment, during the operation of the electric drive axle, after the power from the drive motor is transmitted and torque-distributed by the first planetary gear set assembly, it is output by the first planet carrier 33. At this time, the first driving gear 511, as the direct driving object of the first planet carrier 33, receives and converts this power. Subsequently, through meshing with the first driven gear 512, the power is transmitted to the first driven gear 512 and can then be connected to more downstream power components. At the same time, primary reduction can be achieved between the first sun gear 31 and the first planetary gear 32, and between the first driving gear 511 and the first driven gear 512. According to the selection of different gears, precise power distribution and control can be realized.

[0044] Furthermore, the third transmission gear assembly 53 includes a third driving gear 531 and a third driven gear 532. The third driving gear 531 is connected to the first sun gear 31; the third driven gear 532 meshes with the third driving gear 531; wherein, the third driving gear 531 is used to transmit the power of the first sun gear 31 to the third driven gear 532. In this embodiment, the first planetary gear train 30 selects to directly transmit the power to the third driving gear 531 through the first sun gear 31. Through meshing with the third driven gear 532, the power continues to descend to deeper components of the electric drive axle, and primary reduction can also be achieved between the third driving gear 531 and the third driven gear 532.

[0045] Further, the first shifting component 54 includes a shifting gear 541 and a first shifting sleeve 542. The shifting gear 541 is in transmission connection with the second transmission gear assembly 52. The first shifting sleeve 542 is slidably engaged with the shifting gear 541. The first shifting sleeve 542 has a first gear state of engaging with the first driven gear 512, and the first shifting sleeve 542 has a second gear state of engaging with the third driven gear 532. Wherein, when the first shifting sleeve 542 is in the first gear state, the first shifting sleeve 542 transmits the power on the first driven gear 512 to the shifting gear 541. When the first shifting sleeve 542 is in the second gear state, the first shifting sleeve 542 transmits the power on the third driven gear 532 to the shifting gear 541. By sliding, the first shifting sleeve 542 can be selectively engaged with the first driven gear 512 to switch to the first gear state, or engaged with the third driven gear 532 to switch to the second gear state, so as to selectively transmit the power on the first driven gear 512 to the shifting gear 541, or select to transmit the power on the third driven gear 532 to the shifting gear 541. The shifting gear 541 is in transmission connection with the second transmission gear assembly 52, and can further transmit the power to the second transmission gear assembly 52. Thus, through the first shifting component 54, the power output by the drive motor 10 can be selectively transmitted to the second transmission gear assembly 52 through one-stage deceleration or through two-stage deceleration, that is, two-stage two-speed reduction is achieved.

[0046] It should be noted that the first shifting component 54 can also use a synchronizer, a dual clutch or a transmission mechanism, etc. for gear shifting, and select to transmit the power on the first driven gear 512 or the third driven gear 532 to the second transmission gear assembly 52. For example, through the synchronizer, the rotational speeds of the shifting gear and the target gear can also be synchronously set during gear shifting, so as to reduce the impact and noise during gear shifting, and improve the smoothness of gear shifting and driving comfort.

[0047] Further, the second transmission gear assembly 52 includes a second driving gear 521 and a second driven gear 522. The second driving gear 521 is in transmission connection with the shifting gear 541. The second driven gear 522 is engaged with the second driving gear 521. Wherein, the second driving gear 521 is used to transmit the power of the shifting gear 541 to the second driven gear 522. In this embodiment, after the power is transmitted from the shifting gear 541 to the second driving gear 521, through the gear pair of the second driving gear 521 and the second driven gear 522, the power can be decelerated by one stage, and the second driven gear 522 then transmits the power to the next-stage component of the electric drive axle.

[0048] Further, the second shifting component 55 includes a second shifting sleeve 551 which is in sliding engagement with the second driven gear 522. The second shifting sleeve 551 has a third gear state in which it is power-connected to the input end of the second sun gear 41, and a fourth gear state in which it is in transmission connection with the second planet carrier 43. When the second shifting sleeve 551 is in the third gear state, the second shifting sleeve 551 transmits the power on the second driven gear 522 to the second sun gear 41. When the second shifting sleeve 551 is in the fourth gear state, the second shifting sleeve 551 transmits the power on the second driven gear 522 to the second planet carrier 43. The second shifting sleeve 551 is in sliding engagement with the second driven gear 522, one end of which is engaged with the second driven gear 522, and the other end of which is selectively connected to the second sun gear 41 (i.e., switched to the third gear state) or connected to the second planet carrier 43 (i.e., switched to the fourth gear state). When the second shifting sleeve 551 is in the third gear state, the second shifting sleeve 551 transmits the power on the second driven gear 522 to the second sun gear 41. Since the differential 20 is connected to the output end of the second planet carrier 43, the second sun gear 41 also needs to reduce the power by one stage through the second planet gear 42 before transmitting it to the second planet carrier 43. When the second shifting sleeve 551 is in the fourth gear state, the second shifting sleeve 551 directly transmits the power to the second planet carrier 43. Thus, the second shifting component 55 can selectively transmit the power output by the second driven gear 522 to the differential 20 after one-stage deceleration or two-stage deceleration, that is, two-speed two-stage deceleration is achieved.

[0049] It should be noted that the second shifting component 55 can also use a synchronizer, a dual clutch or a transmission mechanism, etc. for gear shifting.

[0050] Through the above embodiments, after the power is output by the driving motor 10, it is output to the differential 20 after passing through the first planetary gear system 30, the transmission gear system, and the second planetary gear system 40. Due to the first shifting component 54 and the second shifting component 55 in the transmission gear system, different deceleration levels of the power can be selectively adjusted, and different reduction ratios can be achieved through the first planetary gear system 30 and the second planetary gear system 40. Finally, four gear selections and four levels of deceleration selection can be achieved.

[0051] Further, the second planetary gear system 40 further includes a transmission gear 44 coaxially arranged with the second sun gear 41. When the second shift sleeve 551 is in the third gear state, the second shift sleeve 551 meshes with the transmission gear 44 to transmit the power on the second driven gear 522 to the second sun gear 41. When the second shift sleeve 551 is in the third gear state, the power on the second driven gear 522 is transmitted to the transmission gear 44, and the transmission gear 44 directly transmits the power to the second sun gear 41. By means of the transmission gear 44, the power transmission path is simplified, and the smoothness of the power flow is improved.

[0052] Further, the electric drive axle assembly further includes a power take-off 60. The power take-off 60 meshes with the second driven gear 522 through a power take-off gear 61, and the power take-off 60 is used to extract power from the second driven gear 522. The power take-off 60 can extract power from the power transmission path of the electric drive axle through the power take-off gear 61 for other non-driving requirements of the vehicle. For example, the power take-off 60 can take out power to drive a working device, drive a generator to generate electricity for on-vehicle electrical equipment and batteries, and provide power for equipment such as the vehicle's air conditioner and compressor. By meshing the power take-off gear 61 with the second driven gear 522, the power take-off 60 can extract a part of the power without affecting the output of the main power to the wheels, ensuring that the main driving performance of the vehicle can be maintained even when the power take-off 60 is in use.

[0053] According to another specific embodiment of the present application, a vehicle is further provided. The vehicle has an electric drive axle assembly, and the electric drive axle assembly is the electric drive axle assembly in the above embodiment.

[0054] Specifically, as Figures 2 to 5 shown, the vehicle has a first gear four-stage deceleration mode, a second gear three-stage deceleration mode, a third gear three-stage deceleration mode, and a fourth gear two-stage deceleration mode. When the first shift sleeve 542 is in the first gear state and the second shift sleeve 551 is in the third gear state, the vehicle is in the first gear four-stage deceleration mode; when the first shift sleeve 542 is in the second gear state and the second shift sleeve 551 is in the third gear state, the vehicle is in the second gear three-stage deceleration mode; when the first shift sleeve 542 is in the first gear state and the second shift sleeve 551 is in the fourth gear state, the vehicle is in the third gear three-stage deceleration mode; when the first shift sleeve 542 is in the second gear state and the second shift sleeve 551 is in the fourth gear state, the vehicle is in the fourth gear two-stage deceleration mode. Applying this electric drive axle assembly to the vehicle, the gear shifting device on the vehicle can be used to control the first shifting component 54 and the second shifting component 55 to realize the adjustable gears of the vehicle. At the same time, through the gear combination of the planetary gear system, different modes of multi-stage deceleration can be realized.

[0055] When the first shift sleeve 542 is in the first gear state and the second shift sleeve 551 is in the third gear state, the vehicle enters the first gear four-stage deceleration mode. At this time, the power transmission path is output from the drive motor 10 and sequentially passes through the first planet carrier 33 of the first planetary gear system 30, the first transmission gear assembly 51, the second transmission gear assembly 52, and the second sun gear 41 of the second planetary gear system 40. The second sun gear of the second planetary gear system 40 and the second planetary gear 42 are further decelerated by one stage and then pass through. The second planet carrier 43 finally transmits the power to the differential 20 and the wheel end 22. The multi-stage deceleration in the first gear four-stage deceleration mode ensures high torque output at extremely low speeds and is suitable for working conditions such as vehicle starting or climbing that require strong driving force.

[0056] When the first shift sleeve 542 is in the second gear state and the second shift sleeve 551 is in the third gear state, the vehicle is in the second gear three-stage deceleration mode. At this time, the power transmission path is output from the drive motor 10 and sequentially passes through the first sun gear 31 of the first planetary gear system 30, the third transmission gear assembly 53, the second transmission gear assembly 52, and the second sun gear 41 of the second planetary gear system 40. Since the first-stage deceleration between the first sun gear 31 and the first planetary gear 32 is reduced, the second gear three-stage deceleration mode is achieved, which is suitable for the vehicle to be used under working conditions of low speed but not requiring high torque.

[0057] When the first shift sleeve 542 is in the first gear state and the second shift sleeve 551 is in the fourth gear state, the vehicle enters the third gear three-stage deceleration mode. At this time, the power transmission path is output from the drive motor 10 and sequentially passes through the first planet carrier 33 of the first planetary gear system 30, the first transmission gear assembly 51, the second transmission gear assembly 52, and the second planet carrier 43 of the second planetary gear system 40, and finally transmits the power to the differential 20 and the wheel end 22. Since the second transmission gear assembly 52 directly transmits the power to the second planet carrier 43 at this time, the first-stage deceleration between the second sun gear 41 and the second planetary gear 42 is reduced, and the third gear three-stage deceleration mode is achieved. The third gear three-stage deceleration mode provides a higher vehicle speed while maintaining an appropriate torque.

[0058] When the first shift sleeve 542 is in the second gear state and the second shift sleeve 551 is also in the fourth gear state, the vehicle enters the fourth gear two-stage deceleration mode. At this time, the power transmission path is output from the drive motor 10 and sequentially passes through the first sun gear 31 of the first planetary gear system 30, the third transmission gear assembly 53, the second transmission gear assembly 52, and the second planet carrier 43 of the second planetary gear system 40, and finally transmits the power to the differential 20 and the wheel end 22. The fourth gear two-stage deceleration mode reduces the two-stage deceleration between the two planetary gear systems and achieves the two-stage deceleration of the fourth gear. In this mode, the power transmission path is the shortest, the reduction ratio is the smallest, and the vehicle can obtain the highest driving speed, which is suitable for cruising on the highway.

[0059] In this embodiment, by reasonably planning the power transmission path and reduction ratio, the drive motor 10 can be maintained in the efficient operation range at different gears. At the same time, the layout of the shafting is optimized to reduce the center of gravity shift and improve the vehicle stability. Under various driving conditions, the best torque and vehicle speed matching can be provided, while the volume of the drive motor 10 is reduced and the overall efficiency is improved.

[0060] This application also provides a preferred embodiment of an electric drive axle assembly. The electric drive axle assembly includes a set of motor components, and the electrode components include a drive motor 10; a set of power output components, and the power output components include half shafts 21 on both sides and wheel ends 22; a set of four-speed power components, including a first planetary gear system 30 arranged in parallel axes, a transmission gear system, and a second planetary gear system 40; a differential assembly, including a differential 20, fixedly connected to the half shaft 21, and the differential transmits power to the wheel end 22; a power take-off assembly, including a power take-off 60 and a power take-off gear 61.

[0061] Through the above electric drive axle assembly, a single-motor four-speed mode can be realized, which is specifically as follows:

[0062] Single-motor first gear mode: As Figure 2 shown, the drive motor 10 transmits power to the first sun gear 31, transmits power to the first planet carrier 33 through the first planetary gear 32, the first planet carrier 33 transmits power to the first driving gear 511, the first driving gear 511 meshes with the first driven gear 512, so as to transmit power to the first driven gear 512. The first shifting sleeve 542 moves leftward to connect with the first driven gear 512 to transmit power. The power is transmitted from the first shifting sleeve 542 to the shifting gear 541 and then to the second driving gear 521. The second driving gear 521 transmits power to the second driven gear 522. The power is transmitted from the second driven gear 522 to the transmission gear 44 through the second shifting sleeve 551. The transmission gear 44 is fixedly connected to the second sun gear 41. The power is transmitted to the second sun gear 41 and transmitted to the second planet carrier 43 through the second planetary gear 42. Finally, the power from the two paths of the second planet carrier 43 is transmitted to the differential 20, and then transmitted to the wheel end 22 through the half shaft 21.

[0063] Single-motor second gear mode: As Figure 3As shown in the figure, the driving motor 10 transmits power to the first sun gear 31. At this time, the first sun gear 31 is fixedly connected to the third driving gear 531. The third driving gear 531 meshes with the third driven gear 532, and the power is transmitted to the third driven gear 532. The first shift sleeve 542 moves to the right to connect with the third driven gear 532 to transmit power. The power is transmitted from the first shift sleeve 542 to the shift gear 541 and then to the second driving gear 521. The second driving gear 521 transmits power to the second driven gear 522. The power is transmitted from the second driven gear 522 to the transmission gear 44 through the second shift sleeve 551. The transmission gear 44 is fixedly connected to the second sun gear 41, and the power is transmitted to the second sun gear 41. The power is transmitted to the second planet carrier 43 through the second planet gear 42. Finally, the two paths of power from the second planet carrier 43 are transmitted to the differential 20, and then to the wheel end 22 through the half shaft 21.

[0064] Single-motor three-speed mode: As Figure 4 shown in the figure, the driving motor 10 transmits power to the first sun gear 31, and transmits power to the first planet carrier 33 through the first planet gear 32. The first planet carrier 33 transmits power to the first driving gear 511. The first driving gear 511 meshes with the first driven gear 512, so as to transmit power to the first driven gear 512. The first shift sleeve 542 moves to the left to connect with the first driven gear 512 to transmit power. The power is transmitted from the first shift sleeve 542 to the shift gear 541 and then to the second driving gear 521. The second driving gear 521 transmits power to the second driven gear 522. The power is transmitted to the second planet carrier 43 through the second shift sleeve 551. Finally, the two paths of power from the second planet carrier 43 are transmitted to the differential 20, and then to the wheel end 22 through the half shaft 21.

[0065] Single-motor four-speed mode: As Figure 5 shown in the figure, the driving motor 10 transmits power to the first sun gear 31. At this time, the first sun gear 31 is fixedly connected to the third driving gear 531. The third driving gear 531 meshes with the third driven gear 532, and the power is transmitted to the third driven gear 532. The first shift sleeve 542 moves to the right to connect with the third driven gear 532 to transmit power. The power is transmitted from the first shift sleeve 542 to the shift gear 541 and then to the second driving gear 521. The second driving gear 521 transmits power to the second driven gear 522. The power is transmitted to the second planet carrier 43 through the second shift sleeve 551. Finally, the two paths of power from the second planet carrier 43 are transmitted to the differential 20, and then to the wheel end 22 through the half shaft 21.

[0066] Meanwhile, the drive motor 10 adopts a high-speed oil-cooled motor, significantly reducing the volume of the drive motor 10 and improving the efficiency performance. It has four-stage reduction in the first gear, three-stage reduction in the second gear, three-stage reduction in the third gear, and two-stage reduction in the fourth gear, constructing a reasonable number of reduction stages and gear ratio sizes, which can fully balance the large torque requirements in low gears and the high vehicle speed requirements in high gears. The gear ratio configuration in the fourth gear is smaller, which can further improve the efficiency performance during high-speed cruising, ensuring that the drive motor 10 in each gear operates in the optimal efficiency range, thereby improving the system efficiency performance; it is arranged in a three-axis system, with the drive motor 10 close to the reduction housing and a smaller center of gravity offset; an optional power take-off 60 can be installed to achieve power take-off while the vehicle is stationary.

[0067] From the above description, it can be seen that this solution has the following beneficial effects:

[0068] 1) The first-stage reduction adopts the star row shunt of the planetary gear train, and there are two options for output from the planet carrier and the sun gear.

[0069] 2) The vehicle's first gear uses two-stage cylindrical gears and two-stage planetary rows to achieve four-stage reduction, the second gear uses two-stage cylindrical gears and one-stage planetary row to achieve three-stage reduction, the third gear uses one-stage planetary row and two-stage cylindrical gears to achieve three-stage reduction, and the fourth gear uses two-stage cylindrical gears to achieve two-stage reduction, achieving the shortest transmission path and the optimal gear ratio in each gear, and the drive motor 10 operates in the best efficiency range.

[0070] 3) The second-stage reduction can avoid using an idler gear and adopt a larger reduction ratio.

[0071] For the sake of convenience in description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "upper...", etc. can be used here to describe the spatial position relationship between a device or feature shown in the figure and other devices or features. It should be understood that spatial relative terms are intended to include different orientations during use or operation in addition to the orientation described in the figure for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will be positioned as "below other devices or structures" or "under other devices or structures" afterwards. Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding explanations should be made for the spatial relative descriptions used here.

[0072] In addition to the above, it should be noted that the "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in connection with that embodiment being included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in connection with any one embodiment, it is intended that the implementation of such feature, structure or characteristic in connection with other embodiments also falls within the scope of the present invention.

[0073] In the above embodiments, the descriptions of each embodiment have their own emphases. For the parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0074] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An electric drive axle assembly, characterized in that, Comprising: A drive motor (10); A differential (20), which is connected to a vehicle wheel end (22) through a half shaft (21); A first planetary gear train (30), which at least includes a first sun gear (31) and a first planetary gear (32), the first sun gear (31) is connected to the output shaft of the drive motor (10), and the first planetary gear (32) is arranged on a first planetary carrier (33); A second planetary gear train (40), which at least includes a second sun gear (41) and a second planetary gear (42), the second planetary gear (42) is arranged on a second planetary carrier (43), and the output end of the second planetary carrier (43) is connected to the differential (20); A transmission gear train, which is connected to the first planetary gear train (30) and the second planetary gear train (40), and is used to transmit the power of any one of the first planetary carrier (33) and the first sun gear (31) to any one of the second planetary carrier (43) and the second sun gear (41).

2. The electric drive bridge assembly according to claim 1, wherein The transmission gear train includes a first transmission gear assembly (51), a second transmission gear assembly (52), a third transmission gear assembly (53), a first shifting assembly (54) and a second shifting assembly (55), the first transmission gear assembly (51) is connected to the output end of the first planetary carrier (33), the third transmission gear assembly (53) is connected to the output end of the first sun gear (31), the second transmission gear assembly (52) is selectively connected to any one of the first transmission gear assembly (51) and the third transmission gear assembly (53) through the first shifting assembly (54), and the second transmission gear assembly (52) is selectively connected to any one of the second planetary carrier (43) and the second sun gear (41) through the second shifting assembly (55).

3. The electric drive bridge assembly according to claim 2, wherein, The first transmission gear assembly (51) includes: A first driving gear (511), which is connected to the output end of the first planetary carrier (33); A first driven gear (512), which meshes with the first driving gear (511); Wherein, the first driving gear (511) is used to transmit the power of the first planetary carrier (33) to the first driven gear (512).

4. The electric drive bridge assembly according to claim 3, characterized in that, The third transmission gear assembly (53) includes: A third driving gear (531), which is connected to the first sun gear (31); A third driven gear (532), which meshes with the third driving gear (531); Wherein, the third driving gear (531) is used to transmit the power of the first sun gear (31) to the third driven gear (532).

5. The electric drive axle assembly according to claim 4, wherein, The first shifting assembly (54) includes: A shift gear (541), the shift gear (541) is drivingly connected to the second transmission gear assembly (52); A first shift sleeve (542), the first shift sleeve (542) is slidably engaged with the shift gear (541), the first shift sleeve (542) has a first gear state engaged with the first driven gear (512), and the first shift sleeve (542) has a second gear state engaged with the third driven gear (532); Wherein, when the first shift sleeve (542) is in the first gear state, the first shift sleeve (542) transmits the power on the first driven gear (512) to the shift gear (541), and when the first shift sleeve (542) is in the second gear state, the first shift sleeve (542) transmits the power on the third driven gear (532) to the shift gear (541).

6. The electric drive bridge assembly according to claim 5, characterized in that, The second transmission gear assembly (52) includes: A second driving gear (521), the second driving gear (521) is drivingly connected to the shift gear (541); A second driven gear (522), the second driven gear (522) is engaged with the second driving gear (521); Wherein, the second driving gear (521) is used to transmit the power of the shift gear (541) to the second driven gear (522).

7. The electric drive bridge assembly according to claim 6, characterized in that, The second shift assembly (55) includes: A second shift sleeve (551), the second shift sleeve (551) is slidably engaged with the second driven gear (522), the second shift sleeve (551) has a third gear state drivingly connected to the input end power of the second sun gear (41), and the second shift sleeve (551) has a fourth gear state drivingly connected to the second planet carrier (43); When the second shift sleeve (551) is in the third gear state, the second shift sleeve (551) transmits the power on the second driven gear (522) to the second sun gear (41), and when the second shift sleeve (551) is in the fourth gear state, the second shift sleeve (551) transmits the power on the second driven gear (522) to the second planet carrier (43).

8. The electric drive bridge assembly according to claim 7, characterized in that The second planetary gear train (40) further includes a transmission gear (44), the transmission gear (44) is coaxially arranged with the second sun gear (41), and when the second shift sleeve (551) is in the third gear state, the second shift sleeve (551) is engaged with the transmission gear (44) to transmit the power on the second driven gear (522) to the second sun gear (41).

9. The electric drive axle assembly according to claim 6, wherein, The electric drive axle assembly further includes a power take-off (60), the power take-off (60) is engaged with the second driven gear (522) through a power take-off gear (61), and the power take-off (60) is used to extract power from the second driven gear (522).

10. A vehicle, characterized in that, The vehicle has an electric drive axle assembly, and the electric drive axle assembly is the electric drive axle assembly described in any one of claims 1-9.

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