Electric drive system and vehicle

Abstract

The utility model discloses an electric drive system and a vehicle, and the electric drive system comprises a differential device which comprises a shell, a first output shaft and a second output shaft; the driving end of the first motor is connected with the input end of the first transmission device; the first connecting element is arranged on the output connecting shaft and can synchronously rotate along with the output connecting shaft, and the first connecting element is configured to be selectively connected with one of the output end of the first transmission device and the first output shaft; the driving end of the second motor is connected with the input end of the second transmission device; the second connecting element is arranged at the output end of the second transmission device and can synchronously rotate along with the output end of the second transmission device, and the second connecting element is configured to be selectively connected with one of the second output shaft and the shell. And switching between a dual-motor driving mode and a single-motor driving mode is realized.

Description

Technical Field

[0001] The present application relates to the field of vehicles, and in particular to an electric drive system and a vehicle. Background Art

[0002] At present, there are two basic schemes for the configuration of distributed electric drive systems: parallel shaft structure and coaxial planetary structure. The parallel shaft has two forms: input and output in different shafts and coaxial. The technology is relatively mature, but it has disadvantages such as heavy weight, loose envelope, and low power density. The coaxial planetary gearbox has the advantages of compact structure, easy layout, light weight, and high power density. In addition, the current distributed electric drive schemes all use the left and right electric drives to work simultaneously. In standard driving conditions such as long-range operation and ECO mode, the general distributed system still relies on the motors on both sides to drive the output shafts on both sides to rotate, and then drive the wheels to rotate, which is easy to cause additional power loss of the motor and reduction mechanism, which is not conducive to improving the vehicle's endurance. Utility Model Content

[0003] In order to solve the above problems, the present application provides an electric drive system and a vehicle.

[0004] According to one aspect of an embodiment of the present application, an electric drive system is disclosed, which includes a differential device, including a housing, a first output shaft and a second output shaft; a first motor and a first transmission device, wherein the driving end of the first motor is connected to the input end of the first transmission device; a first connecting element and an output connecting shaft, wherein the first connecting element is arranged on the output connecting shaft and can rotate synchronously with the output connecting shaft, and the first connecting element is configured to be able to selectively connect the output end of the first transmission device and one of the first output shaft; a second motor and a second transmission device, wherein the driving end of the second motor is connected to the input end of the second transmission device; a second connecting element is arranged on the output end of the second transmission device and can rotate synchronously with the output end of the second transmission device, and the second connecting element is configured to be able to selectively connect the second output shaft and one of the housing.

[0005] The technical solution provided by the embodiments of the present application includes at least the following beneficial effects:

[0006] The housing of the present application can drive the first output shaft and the second output shaft to rotate at different speeds. When the dual-motor drive mode needs to be realized, the first connecting element synchronously connected to the output connecting shaft is connected to the output end of the first transmission device, so that the first motor can drive the first wheel alone, and the second connecting element synchronously connected to the output end of the second transmission device is connected to the second output shaft, so that the second motor can drive the second wheel alone. When the single-motor drive mode needs to be realized, the first connecting element is connected to the first output shaft, so that the output connecting shaft is combined with the first output shaft, and the second connecting element is connected to the housing of the differential device, so that the second motor can drive the housing to rotate, and then drag the first output shaft and the second output shaft to rotate, so that the second motor drives the wheels on both sides to rotate at the same time. The present application realizes the switching between the dual-motor drive mode and the single-motor drive mode by switching the connection objects of the first connecting element and the second connecting element respectively. It can not only complete the vector control of the speed and torque of the wheels on both sides in the dual-motor drive mode, but also ensure the endurance in the single-motor drive mode.

[0007] In an exemplary embodiment, the electric drive system further includes: a third connecting element, which is disposed between the output end of the first transmission device and the output end of the second transmission device, and is configured to connect or disconnect the output end of the first transmission device and the output end of the second transmission device. When the torque on one side is zero, the third connecting element connects the output end of the first transmission device and the output end of the second transmission device to each other, so that the first transmission device and the second transmission device are connected as a whole, and the torque of the first motor and the second motor are concentrated on the wheel on the other side, increasing the torque of the wheel on this side, which is used for situations such as vehicle escape, greatly improving the vehicle's escape ability.

[0008] In an exemplary embodiment, the first transmission device includes a first sun gear, a first planetary group, a first ring gear and a first planet carrier, the driving end of the first motor is connected to the first sun gear, the first planetary group is meshed with the first sun gear, the first ring gear is fixedly arranged, the first planetary group is meshed with the first ring gear, the first planet carrier is arranged in the first planetary group and rotates synchronously with the first planetary group, and the output end of the first transmission device is located on the first planet carrier; the second transmission device includes a second sun gear, a second planetary group, a second ring gear and a second planet carrier, the driving end of the second motor is connected to the second sun gear, the second planetary group is meshed with the second sun gear, the second ring gear is fixedly arranged, the second planetary group is meshed with the second ring gear, the second planet carrier is arranged in the second planetary group and rotates synchronously with the second planetary group, and the output end of the second transmission device is located on the second planet carrier. The first sun gear, the first planetary group, the first ring gear and the first planet carrier in the first transmission device form a planetary row structure, which has a deceleration adjustment effect on the input of the first motor, and the second sun gear, the second planetary group, the second ring gear and the second planet carrier in the second transmission device form a planetary row structure, which has a deceleration adjustment effect on the input of the second motor.

[0009] In an exemplary embodiment, the first planetary gear set includes a first gear portion and a second gear portion that can rotate synchronously, the first gear portion meshes with the first sun gear, and the second gear portion meshes with the first ring gear; and / or the second planetary gear set includes a third gear portion and a fourth gear portion that can rotate synchronously, the third gear portion meshes with the second sun gear, and the fourth gear portion meshes with the second ring gear. The speed ratio of the planetary gear set structure can be increased, and the adjustment range can be improved.

[0010] In an exemplary embodiment, the first motor is coaxially arranged with the output connecting shaft; and / or the second motor is coaxially arranged with the second output shaft. The driving end of the first motor is the input end, and the output connecting shaft is connected to the first wheel as the output end. The driving end of the second motor is the input end, and the second output shaft is connected to the second wheel as the output end. The input end and the output end on both sides are coaxially arranged, so that the overall reduction structure is a coaxial planetary gear, and the overall weight is reduced by more than 1 / 3 compared with the parallel shaft design, which greatly improves the power density of the electric drive assembly and reduces energy consumption.

[0011] In an exemplary embodiment, a third connecting element is provided between the first planet carrier and the second planet carrier, and the third connecting element is configured to connect or disconnect the first planet carrier and the second planet carrier to each other, thereby simplifying the connection structure, reducing the weight of the equipment, and improving space utilization.

[0012] In an exemplary embodiment, the differential device further comprises a planetary gear set, a first gear and a second gear, the planetary gear set is synchronously connected to the housing, the first gear is arranged at one end of the first output shaft, the second gear is arranged at one end of the second output shaft, the first gear and the second gear are respectively meshed and driven to the planetary gear set; and / or the housing is rotationally connected to the first output shaft; and / or the first connecting element and the second connecting element are both clutches. When in the dual-motor drive mode, the second gear rotates under the drive of the second output shaft, and the first gear and the first output shaft are idle. When in the single-motor drive mode, the second motor drives the housing to rotate, and the housing drives the planetary gear set to rotate, thereby driving the first output shaft and the second output shaft meshed with the planetary gear set to rotate.

[0013] In an exemplary embodiment, the third connecting element includes a first coupling portion and a second coupling portion that can be connected or separated from each other; the electric drive system also includes: a first transmission assembly, including a third gear, a fourth gear, and a first transmission shaft synchronously connected to the fourth gear, the third gear is arranged at the output end of the first transmission device, the fourth gear is meshed with the third gear, the first coupling portion is arranged on the first transmission shaft, and rotates synchronously with the first transmission shaft; a second transmission assembly, including a fifth gear, a sixth gear, and a second transmission shaft synchronously connected to the sixth gear, the fifth gear is arranged at the output end of the second transmission device, the sixth gear is meshed with the fifth gear, and the second coupling portion is arranged on the second transmission shaft, and rotates synchronously with the first transmission shaft. Through the meshing of the third gear and the fourth gear, the meshing of the fifth gear and the sixth gear, and the extension of the first transmission shaft, the extension of the second transmission shaft, the output end of the first transmission device and the output end of the second transmission device are transmission-connected; the first transmission shaft and the second transmission shaft are both arranged parallel to the output connection shaft.

[0014] In an exemplary embodiment, the electric drive system further includes: a controller, which is electrically connected to the first connection element, the second connection element and the third connection element, and is used to control the electric drive system to execute a dual drive mode, a single drive mode and a differential lock mode; in the dual drive mode, the controller controls the first connection element to connect to the output end of the first transmission device, controls the second connection element to connect to the second output shaft, and controls the third connection element to disconnect the output end of the first transmission device and the output end of the second transmission device; in the single drive mode, the controller controls the first connection element to connect to the first output shaft, controls the second connection element to connect to the housing, and controls the third connection element to disconnect; in the differential lock mode, the controller controls the first connection element to connect to the output end of the first transmission device, controls the second connection element to connect to the second output shaft, and controls the third connection element to connect to the output end of the first transmission device and the output end of the second transmission device. According to the environment of the vehicle and the required driving state, the connection of the first connection element, the second connection element and the third connection element is controlled to realize the switching of the electric drive system between the dual drive mode, the single drive mode and the differential lock mode, so as to facilitate the control switching.

[0015] According to one aspect of an embodiment of the present application, a vehicle is disclosed, which includes the above-mentioned electric drive system; a first wheel is transmission-connected to the output connecting shaft and rotates under the drive of the output connecting shaft; and a second wheel is transmission-connected to the second output shaft and rotates under the drive of the second output shaft.

[0016] The technical solution provided by the embodiments of the present application includes at least the following beneficial effects:

[0017] The vehicle disclosed in the present application realizes switching between dual-motor drive mode and single-motor drive mode by respectively switching the connection objects of the first connecting element and the second connecting element. It can not only complete vector control of the wheel speed and torque on both sides in the dual-motor drive mode, but also ensure endurance in the single-motor drive mode, thereby improving the vehicle's economy.

[0018] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the description, are used to explain the principles of the present application.

[0020] Figure 1 A schematic diagram of the composition of an electric drive system provided in one embodiment of the present application;

[0021] Figure 2A schematic diagram of the composition of an electric drive system provided in another embodiment of the present application;

[0022] Figure 3 A schematic diagram of the composition of a car provided in accordance with an embodiment of the present application.

[0023] The following are the descriptions of the reference numerals:

[0024] 1-first wheel, 2-output connecting shaft, 201-first output shaft, 3-first motor, 4-first sun gear, 5-first tooth portion, 6-second tooth portion, 7-first ring gear, 8-first planetary carrier, 9-second planetary carrier, 10-second ring gear, 11-fourth tooth portion, 12-third tooth portion, 13-second sun gear, 14-second motor, 15-second output shaft, 16-second wheel, 17-second connecting element, 20-housing, 2001-first gear, 2002-second gear, 2003-planetary gear set, 22-first connecting element, 18-fifth gear, 19-sixth gear, 21-third connecting element, 23-fourth gear, 24-third gear, 310-vehicle, 320-electric drive system. DETAILED DESCRIPTION

[0025] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that the description of this application will be more comprehensive and complete, and the concept of the example embodiments will be fully conveyed to those skilled in the art.

[0026] In the description of the utility model, all the connection relationships mentioned do not refer to the direct connection of components, but refer to the fact that a better connection structure can be formed by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the utility model can be combined interchangeably without conflicting with each other.

[0027] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0028] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number, and "above", "below", "within" etc. are understood to include the number.

[0030] Reference Figure 1 The present application discloses an electric drive system, which includes a differential device, a first motor 3, a first transmission device, a first connecting element 22, an output connecting shaft 2, a second motor 14, a second transmission device and a second connecting element 17. The differential device includes a housing 20, a first output shaft 201 and a second output shaft 15; the driving end of the first motor 3 is connected to the input end of the first transmission device; the first connecting element 22 is arranged on the output connecting shaft 2 and can rotate synchronously with the output connecting shaft 2, and the first connecting element 22 is configured to be able to selectively connect to the output end of the first transmission device and one of the first output shaft 201; the driving end of the second motor 14 is connected to the input end of the second transmission device; the second connecting element 17 is arranged on the output end of the second transmission device and can rotate synchronously with the output end of the second transmission device, and the second connecting element 17 is configured to be able to selectively connect to one of the second output shaft 15 and the housing 20.

[0031] Specifically, the electric drive system disclosed in the present application comprises a first motor 3 and a second motor 14, the driving end of the first motor 3 is connected to the first transmission device, the driving end of the second motor 14 is connected to the second transmission device, the output connecting shaft 2 is connected to the external first wheel 1, the second output shaft 15 is connected to the second wheel 16, the housing 20 can drive the first output shaft 201 and the second output shaft 15 to rotate at different speeds, and when the dual-motor drive mode needs to be realized, the first connecting element 22 synchronously connected to the output connecting shaft 2 is connected to the output end of the first transmission device, so that the first motor 3 can drive the first wheel 1 alone, and the second connecting element synchronously connected to the output end of the second transmission device is connected to the second output shaft 15, so that the second motor 14 can drive the second wheel alone 16. When a single-motor drive mode is required, the first connecting element 22 is connected to the first output shaft 201, so that the output connecting shaft 2 is combined with the first output shaft 201, and the second connecting element 17 is connected to the housing 20 of the differential device, so that the second motor 14 can drive the housing 20 to rotate, thereby dragging the first output shaft 201 and the second output shaft 15 to rotate, so that the second motor 14 drives the wheels on both sides to rotate at the same time. The present application realizes the switching between the dual-motor drive mode and the single-motor drive mode by switching the connection objects of the first connecting element 22 and the second connecting element 17 respectively. It can not only complete the vector control of the speed torque of the wheels on both sides in the dual-motor drive mode, but also ensure the endurance in the single-motor drive mode, thereby improving the economy of the vehicle 310.

[0032] Further, see Figure 2The electric drive system further includes a third connecting element 21, which is disposed between the output end of the first transmission device and the output end of the second transmission device and is configured to connect or disconnect the output end of the first transmission device and the output end of the second transmission device to each other.

[0033] Specifically, it is necessary to realize that in the differential lock mode, the first connecting element 22 is connected to the output end of the first transmission device, so that the first motor 3 can drive the first wheel 1 alone, and the second connecting element 17 is connected to the second output shaft 15, so that the second motor 14 can drive the second wheel 16 alone, and on the basis of the first motor 3 and the second motor 14 both driving, the third connecting element 21 combines the output end of the first transmission device with the output end of the second transmission device, so that the first transmission device and the second transmission device are connected as a whole, when the torque on one side is zero, the torque of the first motor 3 and the second motor 14 can be concentrated on the wheel on the other side, increasing the wheel torque on the concentrated side, which is used for the vehicle 310 to get out of trouble, etc., greatly improving the ability of the vehicle 310 to get out of trouble. The present application realizes the switching of the electric drive system in the three modes of dual drive mode, single drive mode and differential lock mode by controlling the connection of the first connecting element 22, the second connecting element 17 and the third connecting element 21, and the components are simplified and the cost is low.

[0034] Furthermore, the first transmission device includes a first sun gear 4, a first planetary group, a first ring gear 7 and a first planetary carrier 8, the driving end of the first motor 3 is connected to the first sun gear 4, the first planetary group is meshed with the first sun gear 4, the first ring gear 7 is fixedly arranged, the first planetary group is meshed with the first ring gear 7, the first planetary carrier 8 is arranged in the first planetary group and rotates synchronously with the first planetary group, and the output end of the first transmission device is located on the first planetary carrier 8; the second transmission device includes a second sun gear 13, a second planetary group, a second ring gear 10 and a second planetary carrier 9, the driving end of the second motor 14 is connected to the second sun gear 13, the second planetary group is meshed with the second sun gear 13, the second ring gear 10 is fixedly arranged, the second planetary group is meshed with the second ring gear 10, the second planetary carrier 9 is arranged in the second planetary group and rotates synchronously with the second planetary group, and the output end of the second transmission device is located on the second planetary carrier 9.

[0035] Specifically, the first sun gear 4, the first planetary group, the first ring gear 7 and the first planet carrier 8 in the first transmission device form a planetary row structure, which has a deceleration adjustment effect on the input of the first motor 3, and the second sun gear 13, the second planetary group, the second ring gear 10 and the second planet carrier 9 in the second transmission device form a planetary row structure, which has a deceleration adjustment effect on the input of the second motor 14. The second connecting element 17 of the present application is positioned and connected to the second planet carrier 9, and a third connecting element 21 is provided between the first planet carrier 8 and the second planet carrier 9. The third connecting element 21 can connect or disconnect the first planet carrier 8 and the second planet carrier 9 to each other, simplify the connection structure, reduce the weight of the equipment, and improve the space utilization.

[0036] Among them, the above-mentioned dual-motor driving mode can be used in sport / off-road mode, extreme control mode, split road, tank U-turn, tire burst driving and other situations that require vector control, greatly improving the drivability and safety of the vehicle 310. The power transmission path of the dual-motor driving mode is: first motor 3→first sun gear 4→first planetary carrier 8→first connecting element 22→output connecting shaft 2→first wheel 1, second motor 14→second sun gear 13→second planetary carrier 9→second connecting element 17→second output shaft 15→second wheel 16. The single-motor driving mode can be used for long-range operation and ECO mode, reducing the power loss of the electric drive assembly, increasing the range, and greatly improving the economy of the vehicle 310. The power transmission path of the single-motor driving mode is: second motor 14→second sun gear 13→second planetary carrier 9→second connecting element 17→housing 20→transmitted to the first output shaft 201 and the second output shaft 15 located on both sides of the housing 20, respectively, and then transmitted to the first wheel 1 and the second wheel 16, which can play a differential effect.

[0037] In this embodiment, the first planetary group includes a first gear portion 5 and a second gear portion 6 that can rotate synchronously, the first gear portion 5 meshes with the first sun gear 4, and the second gear portion 6 meshes with the first ring gear 7. The first planetary group of the present application is a double gear having a first gear portion 5 and a second gear portion 6, which can increase the speed ratio of the planetary gear structure and improve the adjustment range.

[0038] Moreover, the second planetary group includes a third gear portion 12 and a fourth gear portion 11 that can rotate synchronously, the third gear portion 12 meshes with the second sun gear 13, and the fourth gear portion 11 meshes with the second ring gear 10. The second planetary group of the present application is a double gear having a third gear portion 12 and a fourth gear portion 11, which can increase the speed ratio of the planetary gear structure and improve the adjustment range.

[0039] In actual connection, the first sun gear 4 can be connected to the first motor 3 through the motor shaft as a whole by means of integration, interference, spline, etc., and the second sun gear 13 can be connected to the second motor 14 through the motor shaft as a whole by means of integration, interference, spline, etc. The first tooth portion 5 can be connected to the second tooth portion 6 as a whole by means of integration, interference, spline, welding, etc. The third tooth portion 12 can be connected to the fourth tooth portion 11 as a whole by means of integration, interference, spline, welding, etc. The first connecting element 22 can be connected to the output connecting shaft 2 as a whole by means of spline, interference, welding, etc. The first connecting element 22 can be combined with one of the first output shaft 201 and the first planetary carrier 8, the second connecting element 17 can be connected to the second planetary carrier 9 as a whole by means of spline, interference, welding, etc., and the second connecting element can be combined with one of the housing of the differential device and the second output shaft 15.

[0040] In the present application, the first motor 3 is coaxially arranged with the output connecting shaft 2, and the second motor 14 is coaxially arranged with the second output shaft 15. Specifically, the driving end of the first motor 3 is the input end, the output connecting shaft 2 is connected to the first wheel 1 as the output end, the driving end of the second motor 14 is the input end, and the second output shaft 15 is connected to the second wheel 16 as the output end. The input end and the output end on both sides are coaxially arranged, so that the overall reduction structure is a coaxial planetary gear, and the overall weight is reduced by more than 1 / 3 compared with the parallel shaft design, which greatly improves the power density of the electric drive assembly and reduces energy consumption.

[0041] Reference Figure 1 and Figure 2 The differential device also includes a planetary gear set 2003, a first gear 2001 and a second gear 2002. The planetary gear set 2003 is synchronously connected to the housing 20. The first gear 2001 is arranged at one end of the first output shaft 201, and the second gear 2002 is arranged at one end of the second output shaft 15. The first gear 2001 and the second gear 2002 are respectively meshed and transmitted to the planetary gear set 2003.

[0042] Specifically, one end of the first output shaft 201 is connected to the first gear 2001, and the other end can be selectively connected or disconnected with the first connecting element 22. When in the dual-motor drive mode, the second gear 2002 rotates driven by the second output shaft 15, and the first gear 2001 and the first output shaft 201 idle. When in the single-motor drive mode, the second motor 14 drives the housing 20 to rotate, and the housing 20 drives the planetary gear set 2003 to rotate, thereby driving the first output shaft 201 and the second output shaft 15 meshing with the planetary gear set 2003 to rotate. The present application realizes the switching between the dual-motor drive mode and the single-motor drive mode by respectively switching the connection objects of the first connecting element 22 and the second connecting element 17.

[0043] The planetary gear set 2003, the first gear 2001 and the second gear 2002 of the present application are located in the housing 20. At the same time, the first output shaft 201 is connected to the first gear 2001 inside the differential device through a spline as a whole, and the second output shaft 15 is connected to the second gear 2002 inside the differential device through a spline to form a whole. A rotating shaft is provided on the housing 20. The planetary gear set 2003 may include at least one planetary wheel, which is rotatably connected to the rotating shaft, so that the planetary gear set 2003 can revolve with the housing 20, and can also rotate under the differential meshing of the first gear 2001 and the second gear 2002.

[0044] In actual installation and connection, the housing 20 is rotationally connected to the first output shaft 201 to improve the rotation stability of the housing 20 .

[0045] In the present application, the first connecting element 22, the second connecting element 17 and the third connecting element 21 are all clutches, which can realize the switching of the connection position. In addition, the first connecting element 22, the second connecting element 17 and the third connecting element 21 can also be connecting elements such as synchronizers.

[0046] In the present application, the third connecting element 21 includes a first coupling portion and a second coupling portion that can be connected or separated from each other; the electric drive system also includes: a first transmission assembly, including a third gear 24, a fourth gear 23, and a first transmission shaft synchronously connected to the fourth gear 23, the third gear 24 is arranged at the output end of the first transmission device, the fourth gear 23 is meshed with the third gear 24, the first coupling portion is arranged on the first transmission shaft, and rotates synchronously with the first transmission shaft; the electric drive system also includes a second transmission assembly, including a fifth gear 18, a sixth gear 19, and a second transmission shaft synchronously connected to the sixth gear 19, the fifth gear 18 is arranged at the output end of the second transmission device, the sixth gear 19 is meshed with the fifth gear 18, and the second coupling portion is arranged on the second transmission shaft, and rotates synchronously with the first transmission shaft.

[0047] Specifically, the third connecting element 21 includes a first combination portion and a second combination portion, the first combination portion is arranged on the first transmission shaft, and the second combination portion is arranged on the second transmission shaft. Through the meshing of the third gear 24 and the fourth gear 23, the meshing of the fifth gear 18 and the sixth gear 19, and the extension of the first transmission shaft, the extension of the second transmission shaft, the output end of the first transmission device and the output end of the second transmission device are connected in transmission. In addition, under the premise that the installation position allows, the first combination portion can be directly arranged on the output end of the first transmission device, or the second combination portion can be directly arranged on the output end of the second transmission device, or the first combination portion is directly arranged on the output end of the first transmission device, and the second combination portion is directly arranged on the output end of the second transmission device, which can reduce the arrangement and connection of components.

[0048] In this embodiment, the first transmission shaft and the second transmission shaft are arranged parallel to the output connecting shaft 2. This facilitates spatial distribution and enables the first combining portion and the second combining portion to be smoothly combined and separated. In actual installation, the first output shaft 201, the second output shaft 15 and the output connecting shaft 2 can be coaxially designed.

[0049] The electric drive system of the present application also includes a controller, which is electrically connected to the first connecting element 22, the second connecting element 17 and the third connecting element 21, and is used to control the electric drive system to execute a dual drive mode, a single drive mode and a differential lock mode; in the dual drive mode, the controller controls the first connecting element 22 to connect to the output end of the first transmission device, controls the second connecting element 17 to connect to the second output shaft 15, and controls the third connecting element 21 to disconnect the output end of the first transmission device and the output end of the second transmission device; in the single drive mode, the controller controls the first connecting element 22 to connect to the first output shaft 201, controls the second connecting element 17 to connect to the housing 20, and controls the third connecting element 21 to disconnect; in the differential lock mode, the controller controls the first connecting element 22 to connect to the output end of the first transmission device, controls the second connecting element 17 to connect to the second output shaft 15, and controls the third connecting element 21 to connect to the output end of the first transmission device and the output end of the second transmission device.

[0050] Specifically, according to the environment in which the vehicle is located and the required driving state, the connection between the first connecting element 22, the second connecting element 17 and the third connecting element 21 is controlled to switch the electric drive system between the dual drive mode, the single drive mode and the differential lock mode, which is convenient for control switching. The controller can control the first connecting element 22, the second connecting element 17 and the third connecting element 21 by controlling driving elements such as motors or hydraulic cylinders.

[0051] Reference Figure 3 The present application also discloses a vehicle 310, which includes the above-mentioned electric drive system 320, as well as a first wheel 1 and a second wheel 16. The first wheel 1 is transmission-connected to the output connecting shaft 2 and rotates under the drive of the output connecting shaft 2; the second wheel 16 is transmission-connected to the second output shaft 15 and rotates under the drive of the second output shaft 15.

[0052] Specifically, the present application switches between the dual-motor drive mode and the single-motor drive mode by switching the connection objects of the first connection element 22 and the second connection element 17, which can not only complete the vector control of the wheel speed torque on both sides in the dual-motor drive mode, but also ensure the endurance in the single-motor drive mode, thereby improving the economy of the vehicle 310. In addition, the output connecting shaft 2 can be connected to the first wheel 1 in a transmission manner through a spline, a flange, a gear transmission structure, etc., and the second output shaft 15 can be connected to the second wheel 16 in a transmission manner through a spline, a flange, a gear transmission structure, etc.

[0053] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the utility model disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the appended claims.

Claims

1. An electric drive system, characterized in that: include: A differential device, comprising a housing, a first output shaft and a second output shaft; A first motor and a first transmission device, wherein a driving end of the first motor is connected to an input end of the first transmission device; a first connecting element and an output connecting shaft, wherein the first connecting element is disposed on the output connecting shaft and can rotate synchronously with the output connecting shaft, and the first connecting element is configured to selectively connect one of the output end of the first transmission device and the first output shaft; A second motor and a second transmission device, wherein a driving end of the second motor is connected to an input end of the second transmission device; The second connecting element is arranged at the output end of the second transmission device and can rotate synchronously with the output end of the second transmission device. The second connecting element is configured to selectively connect the second output shaft and one of the housing.

2. The electric drive system according to claim 1, characterized in that: Also includes: The third connecting element is disposed between the output end of the first transmission device and the output end of the second transmission device, and is configured to connect or disconnect the output end of the first transmission device and the output end of the second transmission device to each other.

3. The electric drive system according to claim 1 or 2, characterized in that: The first transmission device comprises a first sun gear, a first planetary group, a first ring gear and a first planet carrier, the driving end of the first motor is connected to the first sun gear, the first planetary group is meshed with the first sun gear, the first ring gear is fixedly arranged, the first planetary group is meshed with the first ring gear, the first planet carrier is arranged in the first planetary group and rotates synchronously with the first planetary group, and the output end of the first transmission device is located on the first planet carrier; The second transmission device includes a second sun gear, a second planetary group, a second ring gear and a second planetary carrier. The driving end of the second motor is connected to the second sun gear, the second planetary group is meshed with the second sun gear, the second ring gear is fixed, the second planetary group is meshed with the second ring gear, the second planetary carrier is arranged in the second planetary group and rotates synchronously with the second planetary group, and the output end of the second transmission device is located on the second planetary carrier.

4. The electric drive system according to claim 3, characterized in that: The first planetary gear set comprises a first tooth portion and a second tooth portion which can rotate synchronously, the first tooth portion meshes with the first sun gear, and the second tooth portion meshes with the first ring gear; and / or The second planetary group includes a third gear portion and a fourth gear portion that can rotate synchronously, the third gear portion meshes with the second sun gear, and the fourth gear portion meshes with the second ring gear.

5. The electric drive system according to claim 3, characterized in that: The first motor is coaxially arranged with the output connecting shaft; and / or The second motor is coaxially arranged with the second output shaft.

6. The electric drive system according to claim 3, characterized in that: A third connecting element is provided between the first planet carrier and the second planet carrier, and the third connecting element is configured to connect or disconnect the first planet carrier and the second planet carrier to each other.

7. The electric drive system according to claim 1, characterized in that: The differential device further comprises a planetary gear set, a first gear and a second gear, the planetary gear set is synchronously connected to the housing, the first gear is arranged at one end of the first output shaft, the second gear is arranged at one end of the second output shaft, and the first gear and the second gear are respectively meshed and driven with the planetary gear set; and / or The housing is rotatably connected to the first output shaft; and / or The first connecting element and the second connecting element are both clutches.

8. The electric drive system according to claim 2, characterized in that: The third connecting element includes a first connecting portion and a second connecting portion that can be connected to or separated from each other; The electric drive system also includes: A first transmission assembly includes a third gear, a fourth gear, and a first transmission shaft synchronously connected to the fourth gear, wherein the third gear is disposed at an output end of the first transmission device, the fourth gear is meshed with the third gear, and the first coupling portion is disposed on the first transmission shaft and rotates synchronously with the first transmission shaft; A second transmission assembly, comprising a fifth gear, a sixth gear, and a second transmission shaft synchronously connected to the sixth gear, wherein the fifth gear is disposed at an output end of the second transmission device, the sixth gear is meshed with the fifth gear, and the second coupling portion is disposed on the second transmission shaft and rotates synchronously with the first transmission shaft; The first transmission shaft and the second transmission shaft are both arranged parallel to the output connecting shaft.

9. The electric drive system according to claim 2, characterized in that: Also includes: a controller, electrically connected to the first connection element, the second connection element and the third connection element, for controlling the electric drive system to execute a dual drive mode, a single drive mode and a differential lock mode; In the dual-drive mode, the controller controls the first connecting element to connect to the output end of the first transmission device, controls the second connecting element to connect to the second output shaft, and controls the third connecting element to disconnect the output end of the first transmission device and the output end of the second transmission device; In the single drive mode, the controller controls the first connecting element to connect to the first output shaft, controls the second connecting element to connect to the housing, and controls the third connecting element to disconnect; In the differential lock mode, the controller controls the first connecting element to connect to the output end of the first transmission device, controls the second connecting element to connect to the second output shaft, and controls the third connecting element to connect to the output end of the first transmission device and the output end of the second transmission device.

10. A vehicle, characterized in that: include: The electric drive system according to any one of claims 1 to 9; A first wheel is drivingly connected to the output connecting shaft and rotates under the drive of the output connecting shaft; The second wheel is drivingly connected to the second output shaft and rotates under the drive of the second output shaft.

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