Electric drive assembly

Abstract

The present invention provides an electric drive assembly comprising multiple motors, two output half-shafts connected by a differential, and a central shaft sleeved on one of the output half-shafts. A first transmission mechanism is provided between each motor and the central shaft, and a second transmission mechanism and a third transmission mechanism are provided between the central shaft and the differential. Each first transmission mechanism is selectively connected to the central shaft via a first gear transmission unit or a second gear transmission unit, the second transmission mechanism is selectively connected to the differential via a third gear transmission unit or a fourth gear transmission unit, and the third transmission mechanism is connected to the differential via a fifth gear transmission unit or directly to the differential. The electric drive assembly of the present invention facilitates gear adjustment, enabling different torque outputs to adapt to different vehicle speeds and loads. It also improves reliability and stability during use.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile parts, and in particular to an electric drive assembly. Background Art

[0002] With the country's increasing demands for energy conservation and environmental protection, and with people's growing environmental awareness, electric vehicles are gaining popularity and becoming a primary means of daily transportation. The quality of an electric vehicle's electric drive assembly directly impacts its performance. However, current electric drive assemblies suffer from drawbacks such as large space requirements, high costs, and low transmission efficiency. This not only makes the assembly difficult to place within the vehicle, but also leads to poor shifting smoothness and reliability due to inappropriate design.

[0003] While the conventional electric drive assembly structure can improve the performance of the drive assembly to a certain extent, it still suffers from inconvenience and poor stability during gear shifting, thus affecting vehicle comfort. Summary of the Invention

[0004] In view of this, the present invention aims to provide an electric drive assembly that can facilitate gear shifting and has good stability in use.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] An electric drive assembly includes a plurality of motors, two output half-shafts connected by a differential, and a central shaft sleeved on one of the output half-shafts, wherein:

[0007] A first transmission mechanism is provided between each of the motors and the central shaft, and a second transmission mechanism and a third transmission mechanism are provided between the central shaft and the differential;

[0008] Each of the first transmission mechanisms comprises a first intermediate shaft transmission-connected to the motor, a first shifting device sleeved on the first intermediate shaft, and a first gear transmission unit and a second gear transmission unit with different transmission ratios disposed between the first shifting device and the central shaft, and the first shifting device can be selectively transmission-connected to the central shaft via either the first gear transmission unit or the second gear transmission unit;

[0009] The second transmission mechanism comprises a second shifting device sleeved on the central shaft, and a third gear transmission unit and a fourth gear transmission unit having different transmission ratios are provided between the second shifting device and the differential, and the second shifting device can be selectively connected to the differential through the third gear transmission unit or the fourth gear transmission unit;

[0010] The third transmission mechanism has a third shifting device sleeved on the central shaft, and a fifth gear transmission unit is provided between the third shifting device and the differential, and the third shifting device can be connected to the differential transmission through the fifth gear transmission unit, or directly connected to the differential transmission.

[0011] Furthermore, the first gear transmission unit includes a first driving gear arranged on one side of the first shifting device, and a first driven gear arranged on the central shaft and meshing with the first driving gear; the second gear transmission unit includes a second driving gear arranged on the other side of the first shifting device, and a second driven gear arranged on the central shaft and meshing with the second driving gear; each of the first gear transmission units shares one first driven gear, and / or each of the second gear transmission units shares one second driven gear.

[0012] Furthermore, a plurality of second intermediate shafts are provided on the radial outside of the central shaft, and the plurality of second intermediate shafts are connected to the differential drive through a second transmission gear set; the third gear transmission unit, the fourth gear transmission unit and the fifth gear transmission unit are all connected to the differential drive through a plurality of second intermediate shafts.

[0013] Furthermore, the third gear transmission unit includes a third driving gear arranged on one side of the second shifting device, and a third driven gear arranged on the second intermediate shaft and meshing with the third driving gear; the fourth gear transmission unit includes a fourth driving gear arranged on the other side of the second shifting device, and a fourth driven gear arranged on each of the second intermediate shafts and meshing with the fourth driving gear; the fifth gear transmission unit includes a fifth driving gear arranged on one side of the third shifting device, and a fifth driven gear arranged on the second intermediate shaft and meshing with the fifth driving gear.

[0014] Furthermore, the second transmission gear set includes a seventh driven gear connected to the differential, and a seventh driving gear respectively provided on each of the second intermediate shafts, and each of the seventh driving gears is meshed with the seventh driven gear.

[0015] Furthermore, the motor is coaxially arranged with the first intermediate shaft and connected to one end of the first intermediate shaft; or, the motor is connected to the first intermediate shaft through a first transmission gear set and is offset to one side of the first intermediate shaft.

[0016] Furthermore, the motor is coaxially arranged with the first intermediate shaft and connected to one end of the first intermediate shaft; or, the motor is connected to the first intermediate shaft through a first transmission gear set and is offset to one side of the first intermediate shaft.

[0017] Furthermore, the radial distances between the second intermediate shaft and the first intermediate shaft and the central shaft are the same or different, the differential is arranged at one end of the electric drive assembly, and each of the motors is arranged at the other end of the electric drive assembly relative to the differential.

[0018] Furthermore, the motor is connected to the first intermediate shaft through a first transmission gear set, and is offset on one side of the first intermediate shaft; the second intermediate shaft and the first intermediate shaft are arranged in parallel and staggered on the radial outside of the central shaft, the motor and the second intermediate shaft are arranged in staggered manner on the radial outside of the central shaft, and the motor is arranged close to the differential.

[0019] Furthermore, each of the two output half shafts is provided with a planetary gear reduction mechanism, and each of the output half shafts is connected to the wheel transmission through the planetary gear reduction mechanism.

[0020] Furthermore, the first transmission gear set includes a sixth driving gear provided on the motor, and a sixth driven gear provided on the first intermediate shaft and meshing with the sixth driving gear, and the outer diameter of the sixth driving gear is smaller than that of the sixth driven gear.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] In the electric drive assembly described in the present invention, the first shifting device can be selectively connected to the central shaft transmission through the first gear transmission unit or the second gear transmission unit, the second shifting device can be selectively connected to the differential transmission through the third gear transmission unit or the fourth gear transmission unit, and the third shifting device can be connected to the differential transmission through the fifth gear transmission unit, or directly connected to the differential transmission, which can facilitate gear adjustment and output different torques, thereby adapting to different vehicle speeds and loads, thereby improving versatility in use; at the same time, it can also improve the reliability and stability of the electric drive assembly in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 A schematic structural diagram of the electric drive assembly according to the first embodiment of the present invention;

[0025] Figure 2 This is another structural schematic diagram of the electric drive assembly according to the first embodiment of the present invention;

[0026] Figure 3 A schematic structural diagram of the electric drive assembly according to the second embodiment of the present invention;

[0027] Figure 4 This is another structural schematic diagram of the electric drive assembly according to the second embodiment of the present invention;

[0028] Description of reference numerals:

[0029] 1. First motor; 2. Second motor; 3. First shifting device; 4. Second shifting device; 5. Third shifting device;

[0030] 10. First motor output shaft; 11. Sixth driving gear; 12. Sixth driven gear; 13. Second motor output shaft;

[0031] 30. First intermediate shaft; 31. First driving gear; 32. Second driving gear;

[0032] 40. Central shaft; 41. First driven gear; 42. Second driven gear;

[0033] 50. Second intermediate shaft; 51. Third driving gear; 52. Fourth driving gear; 53. Fifth driving gear; 54. Seventh driving gear; 55. Third driven gear; 56. Fourth driven gear; 57. Fifth driven gear;

[0034] 60. Output half shaft; 62. Differential; 64. Seventh driven gear;

[0035] 70. Planetary gear reduction mechanism. DETAILED DESCRIPTION

[0036] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0037] In the description of the present invention, it should be noted that if terms such as "upper," "lower," "inner," and "back" appear to indicate orientation or positional relationships, these are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, if terms such as "first" through "eighth" appear, they are used solely for descriptive purposes and should not be construed as indicating or implying relative importance.

[0038] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0039] Example 1

[0040] This embodiment relates to an electric drive assembly comprising multiple motors, two output half-shafts 60 connected by a differential 62, and a central shaft 40 sleeved on one of the output half-shafts 60. A first transmission mechanism is provided between each motor and the central shaft 40, and a second transmission mechanism and a third transmission mechanism are provided between the central shaft 40 and the differential 62.

[0041] like Figure 1 As shown in FIG, as a preferred embodiment, this embodiment specifically illustrates the structure of the electric drive assembly using two motors as an example. Each first transmission mechanism comprises a first intermediate shaft 30 drivingly connected to the motor, a first shifting device 3 sleeved on the first intermediate shaft 30, and first and second gear transmission units with different transmission ratios disposed between the first shifting device 3 and the central shaft 40. The first shifting device 3 can be selectively connected to the central shaft 40 via either the first gear transmission unit or the second gear transmission unit.

[0042] For the convenience of description below, in this embodiment, Figure 1 The orientation shown is the reference. Figure 1 The upper motor is called the first motor 1, and the lower motor is called the second motor 2. Meanwhile, as a preferred embodiment, the two first intermediate shafts 30, and the first motor 1 and the second motor 2 are all arranged symmetrically with the central axis 40 as the center.

[0043] In a specific implementation, each motor is coaxially arranged with the first intermediate shaft 30 and connected to one end of the first intermediate shaft 30. Figure 1 As shown in FIG, the first intermediate shaft 30 arranged on the same side as the first motor 1 is coaxially arranged with the first motor output shaft 10 of the first motor 1, and the first intermediate shaft 30 arranged on the same side as the second motor 2 is coaxially arranged with the second motor output shaft 13 of the second motor 2. Figure 1 The motor shown in FIG is coaxially arranged with the first intermediate shaft 30, as shown in FIG. Figure 2 As shown, the motor in this embodiment can also be connected to the first intermediate shaft 30 via the first transmission gear set, and is offset to one side of the first intermediate shaft 30 .

[0044] In order to facilitate the distinction of description, in this embodiment, Figure 1 The electric drive assembly in is called the first structure, and Figure 2 As shown in , the electric drive assembly after adding the first transmission gear set based on the first structure is called the second structure.

[0045] In terms of specific structure, refer to Figure 2As shown in the figure, in the second structure, the first transmission gear set includes a sixth driving gear 11 provided on the motor, and a sixth driven gear 12 provided on the first intermediate shaft 30 and meshing with the sixth driving gear 11. The outer diameter of the sixth driving gear 11 is smaller than that of the sixth driven gear 12, and both the first motor 1 and the second motor 2 drive the sixth driving gear 11 to rotate, thereby driving the sixth driven gear 12 to transmit power, thereby driving the first intermediate shaft 30 on the same side to rotate.

[0046] Still refer to Figure 1 As shown in FIG, in the electric drive assembly of this embodiment, the first gear transmission unit includes a first driving gear 31 provided on one side of the first shifting device 3, and a first driven gear 41 provided on a central shaft 40 and meshing with the first driving gear 31. The second gear transmission unit includes a second driving gear 32 provided on the other side of the first shifting device 3, and a second driven gear 42 provided on the central shaft 40 and meshing with the second driving gear 32.

[0047] The first shifting device 3 in this embodiment can be a bidirectional synchronizer in the prior art, which is a mature product and is convenient for connecting to the central shaft 40 through the first gear transmission unit or the second gear transmission unit. The different transmission ratios of the first gear transmission unit and the second gear transmission unit facilitate the adjustment of two different gear positions.

[0048] As a preferred embodiment, still refer to Figure 1 As shown in FIG, the two first gear transmission units share a first driven gear 41, and the two second gear transmission units share a second driven gear 42. This arrangement is conducive to improving the integration effect of the entire electric drive assembly, thereby reducing production costs and reducing the space occupied in the vehicle.

[0049] It is understandable that in this embodiment, it is also possible to make only the two first gear transmission units share a first driven gear 41, or only the two second gear transmission units share a second driven gear 42. In this case, a better use effect can also be achieved. However, compared with the solution of sharing the first driven gear 41 and the second driven gear 42 at the same time, there is no advantage in space occupation and cost. In addition, it is also possible to make each first gear transmission unit include a separately provided first driving gear 31 and a first driven gear 41, and to make each second gear transmission unit include a separately provided second driving gear 32 and a second driven gear 42, but it will take up more axial space.

[0050] The second transmission mechanism in this embodiment includes a second shifting device 4 mounted on a central shaft 40, and a third gear transmission unit and a fourth gear transmission unit having different transmission ratios are provided between the second shifting device 4 and the differential 62. The second shifting device 4 can be selectively connected to the differential 62 via either the third gear transmission unit or the fourth gear transmission unit.

[0051] The third transmission mechanism includes a third shifting device 5 mounted on the central shaft 40, and a fifth gear transmission unit is provided between the third shifting device 5 and the differential 62. The third shifting device 5 can be connected to the differential 62 through the fifth gear transmission unit or directly connected to the differential 62.

[0052] In this embodiment, the different transmission ratios of the third gear transmission unit and the fourth gear transmission unit, as well as the provision of the fifth gear transmission unit, are conducive to changing the torque transmitted to the differential 62, thereby changing the output gear.

[0053] In the electric drive assembly described in this embodiment, the first shifting device 3 can be selectively connected to the central shaft 40 through the first gear transmission unit or the second gear transmission unit, the second shifting device 4 can be selectively connected to the differential 62 through the third gear transmission unit or the fourth gear transmission unit, and the third shifting device 5 can be connected to the differential 62 through the fifth gear transmission unit, or directly connected to the differential 62, and can adjust the gear position to adapt to different vehicle speeds and loads, thereby improving versatility in use; and by providing the central shaft 40, the reliability and stability of the electric drive assembly in use can be improved.

[0054] Based on the overall introduction of the second transmission mechanism and the third transmission mechanism, still refer to Figure 1 A plurality of second intermediate shafts 50 are provided radially outwardly of the central shaft 40. Each second intermediate shaft 50 is drivingly connected to the differential 62 via a second transmission gear set. The third, fourth, and fifth gear transmission units are all drivingly connected to the differential 62 via the plurality of second intermediate shafts 50.

[0055] Specifically, the second and third shifting devices 4, 5 also utilize conventional bidirectional synchronizers. During operation, only one of the second and third shifting devices 4, 5 is operational, while the other is in neutral. During shifting, the dual motor input power is canceled, effectively interrupting torque transmission.

[0056] As an exemplary structure, the third gear transmission unit includes a third driving gear 51 provided on one side of the second shifting device 4, and a third driven gear 55 provided on each second intermediate shaft 50 and meshing with the third driving gear 51. The fourth gear transmission unit includes a fourth driving gear 52 provided on the other side of the second shifting device 4, and a fourth driven gear 56 provided on each second intermediate shaft 50 and meshing with the fourth driving gear 52.

[0057] The fifth gear transmission unit in this embodiment includes a fifth driving gear 53 provided on one side of the third shifting device 5 , and a fifth driven gear 57 provided on each second intermediate shaft 50 and meshing with the fifth driving gear 53 .

[0058] The second transmission gear set further includes a seventh driven gear 64 connected to the differential 62, and a seventh driving gear 54 provided on each of the two second intermediate shafts 50. Each seventh driving gear 54 meshes with the seventh driven gear 64. This arrangement facilitates further adjustment of the torque transmitted to the differential 62.

[0059] In this embodiment, as a preferred implementation, two second intermediate shafts 50 are also provided, located on either side of the central shaft 40. The two second intermediate shafts 50 are symmetrically arranged on opposite sides of the central shaft 40, and are also provided in a one-to-one correspondence with the first intermediate shafts 30 and the central shaft 40 in the two first transmission mechanisms. This further improves the reliability of the electric drive assembly during use.

[0060] In the electric drive assembly of this embodiment, the specifications of the motor can be as small as possible while meeting the usage requirements, which is conducive to reducing the production cost of the electric drive assembly and reducing the space occupied in the vehicle.

[0061] The electric drive assembly in this embodiment adopts Figure 1 When the structure shown in , it can be used in heavy commercial vehicles with small wheelbase torque load requirements. Figure 2 When the structure shown in FIG is used, the electric drive assembly has higher reliability and enhanced load-bearing capacity, and is used in heavy-duty and ultra-heavy-duty commercial vehicles.

[0062] Moreover, the transmission paths of the motors in the electric drive assembly of this embodiment are basically the same in different gears when in use. Figure 1 The first structure is described as an example, wherein the transmission path when the first motor 1 is in use is as follows:

[0063] When the first motor 1 is in first gear, it drives the first intermediate shaft 30 on the same side of the transmission via its first motor output shaft 10. The first shifting device 3 transmits torque to the center shaft 40 through the cooperation of the first driving gear 31 and the first driven gear 41. The second shifting device 4 then transmits torque to the second intermediate shaft 50 on the same side through the cooperation of the third driving gear 51 and the third driven gear 55. At this point, the third shifting device 5 is in neutral. The second intermediate shaft 50 transmits torque to the differential 62 through the cooperation of the seventh driving gear 54 and the seventh driven gear 64. The torque is then transmitted to both ends of the output half-shaft 60 via the differential 62.

[0064] When the first motor 1 is in second gear, it drives the first intermediate shaft 30 on the same side of the transmission via its first motor output shaft 10. The first shifting device 3 transmits torque to the center shaft 40 via the cooperation of the second driving gear 32 and the second driven gear 42. The second shifting device 4 then transmits torque to the second intermediate shaft 50 on the same side via the cooperation of the third driving gear 51 and the third driven gear 55. At this point, the third shifting device 5 is in neutral. The second intermediate shaft 50 transmits torque to the differential 62 via the cooperation of the seventh driving gear 54 and the seventh driven gear 64. The torque is then transmitted to both ends of the output half-shaft 60 via the differential 62.

[0065] When the first motor 1 is in third gear, it is driven by the first motor 1, via its first motor output shaft 10, to rotate the first intermediate shaft 30 on the same side. The first shifting device 3 transmits torque to the center shaft 40 through the cooperation of the first driving gear 31 and the first driven gear 41. The second shifting device 4 then transmits torque to the second intermediate shaft 50 on the same side through the cooperation of the fourth driving gear 52 and the fourth driven gear 56. At this point, the third shifting device 5 is in neutral. The second intermediate shaft 50 transmits torque to the differential 62 through the cooperation of the seventh driving gear 54 and the seventh driven gear 64. The torque is then transmitted to both ends of the output half-shaft 60 via the differential 62.

[0066] When the first motor 1 is in the fourth gear, the first motor 1 drives the first intermediate shaft 30 on the same side to rotate via the first motor output shaft 10 of the first motor 1. The first shifting device 3 transmits torque to the center shaft 40 through the cooperation of the second driving gear 32 and the second driven gear 42. Then, the second shifting device 4 transmits torque to the second intermediate shaft 50 on the same side through the cooperation of the fourth driving gear 52 and the fourth driven gear 56. At this time, the third shifting device 5 is in the neutral position. The second intermediate shaft 50 transmits torque to the differential 62 through the cooperation of the seventh driving gear 54 and the seventh driven gear 64. The torque is then transmitted to both ends of the output half shaft 60 through the differential 62.

[0067] When the first motor 1 is in fifth gear, the first motor 1 drives the first intermediate shaft 30 on the same side to rotate via the first motor output shaft 10 of the first motor 1. The first shifting device 3 transmits torque to the central shaft 40 through the cooperation of the first driving gear 31 and the first driven gear 41. At this time, the second shifting device 4 is in neutral. The central shaft 40 transmits torque to the second intermediate shaft 50 through the cooperation of the fifth driving gear 53 and the fifth driven gear 57. The second intermediate shaft 50 transmits torque to the differential 62 through the cooperation of the seventh driving gear 54 and the seventh driven gear 64. The torque is then transmitted to both ends of the output half-shaft 60 via the differential 62.

[0068] When the first motor 1 is in the sixth gear, the first motor 1 drives the first intermediate shaft 30 on the same side to rotate via the first motor output shaft 10 of the first motor 1. The first shifting device 3 transmits torque to the central shaft 40 through the cooperation of the second driving gear 32 and the second driven gear 42. At this time, the second shifting device 4 is in the neutral position. The central shaft 40 transmits torque to the second intermediate shaft 50 through the cooperation of the fifth driving gear 53 and the fifth driven gear 57. The second intermediate shaft 50 transmits torque to the differential 62 through the cooperation of the seventh driving gear 54 and the seventh driven gear 64. The torque is then transmitted to both ends of the output half-shaft 60 via the differential 62.

[0069] When the first motor 1 is in seventh gear, the first motor 1 drives the first intermediate shaft 30 on the same side to rotate via the first motor output shaft 10 of the first motor 1. The first shifting device 3 transmits torque to the central shaft 40 through the cooperation of the first driving gear 31 and the first driven gear 41. At this time, the second shifting device 4 is in neutral position, and the central shaft 40 is connected to the differential 62 via the seventh driven gear 64. The torque is then transmitted to both ends of the output half-shaft 60 through the differential 62.

[0070] When the first motor 1 is in eighth gear, it is driven by the first motor 1, via the first motor output shaft 10, to rotate the first intermediate shaft 30 on the same side. The first shifting device 3 transmits torque to the center shaft 40 through the cooperation of the second driving gear 32 and the second driven gear 42. At this time, the second shifting device 4 is in neutral, and the center shaft 40 is connected to the differential 62 via the seventh driven gear 64. The torque is then transmitted to both ends of the output half-shaft 60 via the differential 62.

[0071] That is, in this embodiment, the first motor 1 and the second motor 2 each have first to eighth gears and a neutral gear when in use. In specific use, the first motor 1 and the second motor 2 can operate synchronously, or only the first motor 1 or the second motor 2 can operate. When the two motors operate synchronously, the specific gear combinations of the first motor 1 and the second motor 2 in this embodiment are as follows:

[0072] When the first motor 1 is in the first gear and the second gear, the second motor 2 can switch between the first gear, the second gear, or neutral. When the first motor 1 is in the third gear and the fourth gear, the second motor 2 can switch between the third gear, the fourth gear, or neutral. When the first motor 1 is in the fifth gear and the sixth gear, the second motor 2 can switch between the fifth gear, the sixth gear, or neutral. When the first motor 1 is in the seventh gear and the eighth gear, the second motor 2 can switch between the seventh gear, the eighth gear, or neutral.

[0073] When the second motor 2 is in a different gear, the gear that the first motor 1 can adjust is aligned with the corresponding gear of the first motor 1 and the second motor 2. In this embodiment, while one motor is in the current gear, the other motor can be shifted, thereby enabling uninterrupted shifting, improving shifting smoothness and stability during use.

[0074] In this embodiment, the two motors in gears 1 through 6 utilize a four-stage torque reduction and torque increase method to deliver torque, enabling high-torque driving under heavy loads, medium loads, and low to medium speeds. In gears 7 and 8, the two motors utilize a two-stage, highly efficient torque transfer method, enabling dual-motor driving under medium- and high-speed, full-power cruising conditions. Under low-load conditions, one motor can be disengaged and shut down, allowing the other to operate independently, thereby improving driving efficiency under low-load conditions.

[0075] In this embodiment, it should be noted that, in addition to the two motors mentioned above, three, four or more motors may be arranged circumferentially along the central axis 40. When three or more motors are used, the entire electric drive assembly can adjust more gears and has a wider adaptability. Of course, in a specific implementation, the number of motors can be selected according to the use requirements, as long as the use requirements are met. Preferably, when the number of motors is more than two, each first gear transmission unit can still share a first driven gear 41, and each second gear transmission unit can still share a second driven gear 42, so that the first gear transmission unit and the second gear transmission unit are respectively connected to the transmission of the central axis 40.

[0076] Of course, it is also feasible to have each first gear transmission unit individually connected to the central shaft 40 via a first driven gear 41, and each second gear transmission unit individually connected to the central shaft 40 via a second driven gear 42. However, this solution requires more space for arrangement and is more expensive to produce.

[0077] In addition, it should be noted that in this embodiment, in addition to making the radial distances between the second intermediate shaft 50 and the first intermediate shaft 30 and the central axis 40 the same, it is also possible to make the radial distances between the second intermediate shaft 50 and the first intermediate shaft 30 and the central axis 40 different, so that the two are parallel to each other but staggered. Figure 1 and Figure 2 In the various structures shown, the differential 62 is specifically arranged at one end of the electric drive assembly, and the motors are arranged at the other end of the electric drive assembly relative to the differential 62 .

[0078] Example 2

[0079] This embodiment also relates to an electric drive assembly, which has a structure substantially the same as that of the electric drive assembly in the first embodiment, except that: Figure 3 As shown in FIG, the example of using two motors is still used for the purpose of explanation. In this embodiment, each motor is connected to the first intermediate shaft 30 via a first transmission gear set and is offset to one side of the first intermediate shaft 30. The second intermediate shaft 50 and the first intermediate shaft 30 are arranged parallel and staggered radially outward from the center shaft 40. The motors are also arranged parallel and staggered radially outward from the second intermediate shaft 50 and the center shaft 40, and are also located close to the differential 62.

[0080] It is understandable that Figure 3 The arrangement of the electric drive assembly is a variation of the second structure in the first embodiment. Figure 3 As shown in the above, the structure shown in this embodiment is Figure 2The main difference compared with the second structure shown in the figure is that the first intermediate shaft 30 and the second intermediate shaft 50 are arranged in parallel and staggered on the radial outside of the central shaft 40, and each motor and the second intermediate shaft 50 are arranged in parallel and staggered on the radial outside of the central shaft 40, and specifically, the second intermediate shaft 50 and the motor are arranged in an inside-outside nested manner in the radial direction of the central shaft 40.

[0081] This embodiment Figure 3 The structural arrangement shown in the figure can make full use of the radial outer space of the central axis 40 and significantly reduce the radial size of the central axis 40 of the electric drive assembly. This is conducive to further reducing the axial length of the entire electric drive assembly, and thus is more convenient for layout and implementation in the vehicle. Figure 3 The electric drive assembly of the shown structure can be used in heavy trucks.

[0082] In addition, in this embodiment, as one implementation, a planetary gear reduction mechanism 70 may be provided on each of the two output half-shafts 60. This planetary gear reduction mechanism 70 may be a fixed-speed reduction mechanism, so that each output half-shaft 60 is transmission-connected to the wheels via the fixed-speed planetary gear reduction mechanism 70. The planetary gear reduction mechanism 70 in this embodiment may employ a mature structure in the prior art. This has the advantages of being a mature product, having a small footprint, and having high transmission efficiency.

[0083] The electric drive assembly in this embodiment, by providing a planetary gear reduction mechanism 70, can effectively reduce the rotational speed and increase the torque, thereby improving the transmission efficiency. When used on super-heavy trucks, it has good driving effect and operational stability.

[0084] In terms of specific structure, Figure 4 As shown in the figure, the electric drive assembly shown is based on Figure 3 The structure shown in the figure is increased by a planetary gear reduction mechanism 70. Figure 4 The electric drive assembly of the structure shown can be applied to super-heavy trucks to achieve better driving effect and stability in use.

[0085] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An electric drive assembly, characterized in that: The invention comprises a plurality of motors, two output half shafts (60) connected by a differential (62), and a central shaft (40) sleeved on one of the output half shafts (60), wherein: A first transmission mechanism is provided between each of the motors and the central shaft (40), and a second transmission mechanism and a third transmission mechanism are provided between the central shaft (40) and the differential (62); Each of the first transmission mechanisms comprises a first intermediate shaft (30) connected to the motor, a first shifting device (3) sleeved on the first intermediate shaft (30), and a first gear transmission unit and a second gear transmission unit with different transmission ratios arranged between the first shifting device (3) and the central shaft (40), and the first shifting device (3) can be selectively connected to the central shaft (40) through the first gear transmission unit or the second gear transmission unit; The second transmission mechanism comprises a second shifting device (4) sleeved on the central shaft (40), and a third gear transmission unit and a fourth gear transmission unit having different transmission ratios are provided between the second shifting device (4) and the differential (62), and the second shifting device (4) can be selectively connected to the differential (62) through the third gear transmission unit or the fourth gear transmission unit; The third transmission mechanism comprises a third shifting device (5) sleeved on the central shaft (40), and a fifth gear transmission unit is provided between the third shifting device (5) and the differential (62), and the third shifting device (5) can be connected to the differential (62) through the fifth gear transmission unit, or directly connected to the differential (62); A plurality of second intermediate shafts (50) are provided radially outside the central shaft (40), and the plurality of second intermediate shafts (50) are transmission-connected to the differential (62) via a second transmission gear set; the third gear transmission unit, the fourth gear transmission unit, and the fifth gear transmission unit are all transmission-connected to the differential (62) via the plurality of second intermediate shafts (50); The motor is connected to the first intermediate shaft (30) through a first transmission gear set and is offset to one side of the first intermediate shaft (30); the second intermediate shaft (50) and the first intermediate shaft (30) are arranged in parallel and staggered on the radial outside of the central shaft (40); the motor and the second intermediate shaft (50) are arranged in parallel and staggered on the radial outside of the central shaft (40), and the motor is arranged close to the differential (62); the second intermediate shaft (50) and the motor are arranged in an inner and outer nested manner in the radial direction of the central shaft (40).

2. The electric drive assembly according to claim 1, characterized in that: The first gear transmission unit comprises a first driving gear (31) provided on one side of the first shifting device (3), and a first driven gear (41) provided on the central shaft (40) and meshing with the first driving gear (31); The second gear transmission unit comprises a second driving gear (32) arranged on the other side of the first shifting device (3), and a second driven gear (42) arranged on the central shaft (40) and meshing with the second driving gear (32); Each of the first gear transmission units shares one first driven gear (41), and / or each of the second gear transmission units shares one second driven gear (42).

3. The electric drive assembly according to claim 1, characterized in that: The third gear transmission unit comprises a third driving gear (51) provided on one side of the second shifting device (4), and a third driven gear (55) provided on each of the second intermediate shafts (50) and meshing with the third driving gear (51); The fourth gear transmission unit comprises a fourth driving gear (52) arranged on the other side of the second shifting device (4), and a fourth driven gear (56) arranged on each of the second intermediate shafts (50) and meshing with the fourth driving gear (52); The fifth gear transmission unit includes a fifth driving gear (53) arranged on one side of the third shifting device (5), and a fifth driven gear (57) arranged on each of the second intermediate shafts (50) and meshing with the fifth driving gear (53).

4. The electric drive assembly according to claim 1, characterized in that: The second transmission gear set includes a seventh driven gear (64) connected to the differential (62), and a seventh driving gear (54) respectively provided on each of the second intermediate shafts (50), and each of the seventh driving gears (54) is meshed with the seventh driven gear (64).

5. The electric drive assembly according to claim 1, characterized in that: A planetary gear reduction mechanism (70) is provided on each of the two output half shafts (60), and each output half shaft (60) is connected to the wheel through the planetary gear reduction mechanism (70).

6. The electric drive assembly according to claim 1, characterized in that: The first transmission gear set comprises a sixth driving gear (11) arranged on the motor, and a sixth driven gear (12) arranged on the first intermediate shaft (30) and meshing with the sixth driving gear (11), wherein the outer diameter of the sixth driving gear (11) is smaller than that of the sixth driven gear (12).

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