Driving system and vehicle

Abstract

The invention provides a driving system and a vehicle, the driving system comprises a first motor and a second motor which are coaxially distributed, a first transmission shaft is sleeved with the first motor, a second transmission shaft is sleeved with the second motor, and the first transmission shaft and the second transmission shaft are connected through a first connector; the first transmission shaft and the first output shaft are connected through a second combination piece, the first transmission assembly comprises an inner connection planet row and an outer connection planet row arranged on the radial outer side of the inner connection planet row, and the inner connection planet row is in transmission connection with the first motor, the first transmission shaft and the outer connection planet row; the external planet row is in transmission connection with the first output shaft, and the second transmission assembly is in transmission connection between the second motor and the second transmission shaft. By controlling the connection and disconnection states of the first connector and the second connector, dual-motor distributed driving can be switched into single-motor centralized driving under the low power requirement, so that the power loss of the driving system is reduced.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the field of power transmission technology, and particularly relate to a drive system and a vehicle. BACKGROUND

[0002] In the current field of vehicle design and manufacturing, distributed drive systems are gradually becoming an important configuration choice for many vehicle models due to their significant technical advantages. This system can achieve independent control of each drive wheel of the vehicle, which not only greatly improves the power response speed and maneuverability of the vehicle, but also optimizes the driving stability through precise torque distribution.

[0003] However, the distributed drive system also has some drawbacks in actual application. The core of the problem is that each drive motor needs to maintain real-time synchronized power output state under all driving conditions of the vehicle. This results in the need for multiple motors to operate simultaneously when the vehicle is in a low power demand scenario, such as low-speed cruising, flat road driving, etc. This "full-time working" mode inevitably increases the power loss of the drive system, greatly reducing the overall operating efficiency. SUMMARY

[0004] Embodiments of the present application provide a drive system and a vehicle, aiming to improve the problem of high power loss of the existing distributed drive system in a low power demand scenario.

[0005] The present application provides a drive system, which comprises: a first motor and a second motor, the first motor and the second motor being coaxially distributed; a first transmission shaft, the first motor being sleeved on the first transmission shaft; a second transmission shaft, the second motor being sleeved on the second transmission shaft; a first coupling member, the first coupling member being arranged between the first transmission shaft and the second transmission shaft to control the power on-off between the first transmission shaft and the second transmission shaft; a first transmission assembly, the first transmission assembly comprising an in-line planetary gear set and an out-of-line planetary gear set arranged radially outside the in-line planetary gear set, the in-line planetary gear set being in transmission connection with the first motor, the first transmission shaft and the out-of-line planetary gear set; a first output shaft, the first output shaft being in transmission connection with the out-of-line planetary gear set; a second coupling member, the second coupling member being arranged between the first transmission shaft and the first output shaft to control the power on-off between the first transmission shaft and the first output shaft; and a second transmission assembly, the second transmission assembly being in transmission connection between the second motor and the second transmission shaft.

[0006] In the present application, by controlling the coupling and decoupling state of the first coupling member and the second coupling member, the first transmission assembly can both slow down and have differential effect. When the first coupling member is decoupled and the second coupling member is coupled, the first motor and the second motor can work simultaneously and drive the first output shaft and the second transmission shaft respectively to realize double-motor distributed driving. When the first coupling member is coupled and the second coupling member is decoupled, the first motor can drive the first output shaft and the second transmission shaft alone, and dynamically adjust the speed difference between the first output shaft and the second transmission shaft through the first transmission assembly to realize single-motor centralized driving. Thus, it can be applied to driving conditions with low power demand, thereby reducing the power loss of the driving system.

[0007] An optional application, the inner-connection planetary row includes: an inner-connection sun gear, which is in transmission connection with the first rotor shaft of the first motor; at least two inner-connection planet gears, which are respectively in meshing connection with the inner-connection sun gear; an inner-connection ring gear, which is in meshing connection with the outer sides of the inner-connection planet gears and is in transmission connection with the outer-connection planetary row; and an inner-connection planet carrier, which is in transmission connection with the first transmission shaft, and the inner-connection planet gears are arranged on the inner-connection planet carrier.

[0008] In the present application, the inner-connection sun gear can be driven to rotate by the first motor, and the first transmission shaft can be driven to rotate by the power output from the inner-connection sun gear to the inner-connection planet carrier, and the second transmission shaft can be driven to output power by the first transmission shaft, so as to realize single-motor power output and reduce the additional power loss of the driving system. Alternatively, the inner-connection sun gear can be driven to rotate by the first motor, the outer-connection planetary row can be driven to transmit power by the inner-connection sun gear, and the first output shaft in transmission connection with the outer-connection planetary row can output power. The second transmission assembly can be driven to transmit power by the second motor, and the second transmission shaft in transmission connection with the second transmission assembly can output power, so as to realize double-motor distributed driving of the driving system. Moreover, the inner-connection planetary row arranged along the radial outer side of the first transmission shaft and the outer-connection planetary row arranged along the radial outer side of the inner-connection planetary row make full use of the high space utilization rate of the gear set in the planetary row, so that the structure of the driving system is relatively compact, the transmission function with higher complexity can be realized in a smaller assembly space, the stability of power transmission can be ensured, and the overall weight and volume of the driving system are reduced.

[0009] An optional application, the outer-connection planetary row includes: an outer-connection sun gear, which is in transmission connection with the inner-connection ring gear; at least two outer-connection planet gears, which are respectively in meshing connection with the outer-connection sun gear; an outer-connection planet carrier, which is in fixed connection with a stationary part, and the outer-connection planet gears are arranged on the outer-connection planet carrier; and an outer-connection ring gear, which is in meshing connection with the outer sides of the outer-connection planet gears and is in transmission connection with the first output shaft.

[0010] In the present application, the outer sun gear is located radially outside the inner ring gear and is in driving connection with the inner ring gear. The outer ring gear is in driving connection with the first output shaft, so that the power output by the first motor can be transmitted to the outer planetary gear set through the inner ring gear and output through the first output shaft. Thus, the structural distribution of the inner planetary gear set and the outer planetary gear set can be relatively compact, the overall volume of the drive system is reduced, and a more complex transmission function can be realized in a smaller assembly space.

[0011] In an optional application, the inner ring gear and the outer sun gear are integrally formed.

[0012] In the present application, the inner ring gear and the outer sun gear are integrally formed, which means that the radially outer side of the inner ring gear can be provided with tooth grooves for engaging with the outer planetary gears. Thus, the inner ring gear can also serve as the outer sun gear, which can reduce the structural complexity of the first transmission assembly and further reduce the weight of the first transmission assembly, so that the structure of the drive system is more compact, and the volume and overall envelope size can be further reduced.

[0013] In an optional application, the drive system further comprises a third coupling member arranged between the first rotor shaft of the first motor and the second rotor shaft of the second motor, for controlling the power on-off between the first rotor shaft and the second rotor shaft.

[0014] In the present application, the driving connection relationship between the first rotor shaft and the second rotor shaft can be controlled by the coupling or disconnection of the third coupling member, and the output torque of the first rotor shaft or the second rotor shaft can be changed, so that it is suitable for driving conditions that require large torque output. In the working condition requiring extremely large torque output, for example, when one side of the vehicle wheel loses adhesion, the third coupling member is coupled to superimpose the power output by the first motor and the second motor, and the power is output to the first output shaft and the second transmission shaft, so that the vehicle can better escape from the trouble.

[0015] In an optional application, the drive system further comprises a fourth coupling member arranged between the second transmission assembly and the second transmission shaft, for controlling the power on-off between the second transmission assembly and the second transmission shaft.

[0016] In the present application, based on the above structural design, the power on-off between the second motor and the second transmission shaft can be controlled by the coupling or disconnection of the fourth coupling member. When the second motor needs to work, the fourth coupling member can be coupled, and the driving connection between the second motor and the second transmission shaft is established. When the second motor does not need to work, the fourth coupling member can be disconnected, and the power on the second transmission shaft will not be transmitted to the second motor, thereby avoiding drag loss and improving the overall driving efficiency of the drive system.

[0017] An optional invention content, the second transmission assembly comprises: an inner sun gear, the inner sun gear is in transmission connection with a second rotor shaft of the second motor;At least two first planetary gears, the at least two first planetary gears are respectively engaged with the inner sun gear;At least two second planetary gears, the at least two second planetary gears are in transmission connection with the first planetary gears;An inner ring gear, the inner ring gear is engaged with the second planetary gears, and the inner ring gear is fixedly connected with a stationary part;An inner carrier, the inner carrier is connected with the second transmission shaft through a fourth coupling;The first planetary gears and the second planetary gears are coaxially arranged on the inner carrier.

[0018] In the invention content, based on the structure design, the second transmission assembly can realize the adjustment requirement of different rotating speeds of the second transmission shaft output, further reduce the overall volume and overall weight of the driving system on the basis of simplifying the structure of the second transmission assembly and reducing the assembly space.

[0019] An optional invention content, the diameter of the first planetary gear is smaller than the diameter of the second planetary gear.

[0020] In the invention content, when the rotating power is input from the first planetary gear with smaller diameter to drive the second planetary gear with larger diameter, the transmission ratio is increased, thereby achieving the effect of speed reduction and torque increase.

[0021] An optional invention content, the driving system further comprises: an engine;A fifth coupling, the fifth coupling is arranged between the second transmission assembly and the engine, to control the power on-off between the engine and the second transmission assembly.

[0022] In the invention content, the engine, the fifth coupling and the second motor can constitute a power generation system, so that the driving system can increase the range mode, and the power can be supplemented through the range mode. Without additional generator, the overall weight and overall volume of the driving system can be reduced, and the production cost of the driving system can be greatly reduced.

[0023] The application provides a vehicle, the vehicle comprises a first wheel, a second wheel and a driving system according to any one of the above invention contents, the first wheel is connected with the first output shaft, and the second wheel is connected with the second transmission shaft.

[0024] In the embodiment of the present application, the first transmission shaft and the second transmission shaft are connected in transmission through the first coupling arranged between the first transmission shaft and the second transmission shaft, so that the first motor simultaneously outputs power to the first wheel and the second wheel in the low power demand working condition, and the additional efficiency loss of the driving system is reduced. The first motor drives the in-line planetary gear train and the out-line planetary gear train arranged on the radial outer side of the in-line planetary gear train to output power to the first wheel. The state of the second coupling is controlled so that the first transmission assembly can not only reduce speed but also differential. The second motor drives the second transmission assembly to output power to the second wheel. Therefore, the double-motor distributed driving of the driving system can be realized, and the single-motor driving in the low power demand working condition of the vehicle is realized, the power loss of the vehicle is reduced, and the overall weight and volume of the vehicle are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a structure integrated stick chart of a driving system provided by an embodiment of the present application;

[0026] Figure 2 is another structure integrated stick chart of a driving system provided by an embodiment of the present application;

[0027] Figure 3 is a power transmission path schematic diagram of a single-motor output mode of a driving system provided by an embodiment of the present application;

[0028] Figure 4 is a power transmission path schematic diagram of a double-motor distributed driving mode of a driving system provided by an embodiment of the present application;

[0029] Figure 5 is a power transmission path schematic diagram of a double-motor centralized driving mode of a driving system provided by an embodiment of the present application;

[0030] Figure 6 is a power transmission path schematic diagram of a double-motor differential lock first output mode of a driving system provided by an embodiment of the present application;

[0031] Figure 7 is a power transmission path schematic diagram of a double-motor differential lock second output mode of a driving system provided by an embodiment of the present application;

[0032] Figure 8 is a power transmission path schematic diagram of a double-motor differential lock third output mode of a driving system provided by an embodiment of the present application;

[0033] Figure 9 is a power transmission path schematic diagram of a single-motor centralized output range extending mode of a driving system provided by an embodiment of the present application;

[0034] Figure 10 is a schematic diagram of a power transmission path of a driving system running a single-motor differential locking output mode provided by an embodiment of the present application;

[0035] Figure 11 is a schematic diagram of a power transmission path of a driving system running a three-power-source output mode provided by an embodiment of the present application;

[0036] Legend:

[0037] 1, first motor; 11, first rotor; 12, first stator; 2, second motor; 21, second rotor; 22, second stator; 3, first transmission shaft; 4, second transmission shaft; 5, first coupling member; 6, first transmission assembly; 61, inner-connection planetary gear set; 611, inner-connection sun gear; 612, inner-connection planet gear; 613, inner-connection ring gear; 614, inner-connection carrier; 62, outer-connection planetary gear set; 621, outer-connection sun gear; 622, outer-connection planet gear; 623, outer-connection carrier; 624, outer-connection ring gear; 7, second coupling member; 8, second transmission assembly; 81, inner sun gear; 82, first planet gear; 83, second planet gear; 84, inner ring gear; 85, inner carrier; 9, third coupling member; 10, fourth coupling member; 11, engine; 12, fifth coupling member; 13, first output shaft; 14, first wheel; 15, second wheel. DETAILED DESCRIPTION

[0038] In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0039] In the current field of vehicle design and manufacturing, distributed driving systems are gradually becoming an important configuration choice for many vehicle models due to their significant technical advantages. This system can achieve independent control of each driving wheel of the vehicle, which not only greatly improves the power response speed and maneuverability of the vehicle, but also optimizes the driving stability through precise torque distribution.

[0040] However, the distributed driving system also has some drawbacks in actual application. The core of the problem is that each driving motor needs to maintain real-time synchronized power output state under all driving conditions of the vehicle. This results in the need for multiple motors to operate simultaneously when the vehicle is in a low power demand scenario, such as low-speed cruising, flat road driving, etc. This "full-time working" mode inevitably increases the power loss of the driving system, greatly reducing the overall operating efficiency.

[0041] The embodiment of the application provides a driving system, which can include a first motor 1, a second motor 2, a first transmission shaft 3, a second transmission shaft 4, a first combination 5, a first transmission assembly 6, a first output shaft 13, a second combination 7 and a second transmission assembly 8. The first motor 1 and the second motor 2 are coaxially distributed. The first motor 1 is sleeved on the first transmission shaft 3. The second motor 2 is sleeved on the second transmission shaft 4. The first combination 5 is arranged between the first transmission shaft 3 and the second transmission shaft 4, and is used for controlling the power on-off between the first transmission shaft 3 and the second transmission shaft 4. The first transmission assembly 6 includes an inner-connection planetary row 61 and an outer-connection planetary row 62 arranged on the radial outer side of the inner-connection planetary row 61, and the inner-connection planetary row 61 is in transmission connection with the first motor 1, the first transmission shaft 3 and the outer-connection planetary row 62 respectively. The first output shaft 13 is in transmission connection with the outer-connection planetary row 62. The second combination 7 is arranged between the first transmission shaft 3 and the first output shaft 13, and is used for controlling the power on-off between the first transmission shaft 3 and the first output shaft 13. The second transmission assembly 8 is in transmission connection between the second motor 2 and the second transmission shaft 4.

[0042] In the embodiment of the application, the inner-connection planetary row 61 arranged in the radial direction and in transmission connection and the outer-connection planetary row 62 arranged on the radial outer side of the inner-connection planetary row 62 are arranged, so that the first transmission assembly 6 can not only play a role of speed reduction, but also play a role of differential. In a low power demand working condition, the first transmission shaft 3 and the second transmission shaft 4 can be driven to rotate only by the first motor 1, and then power is output to a to-be-driven member, at this time, the first combination 5 is combined, the second combination 7 is disconnected, the first transmission shaft 3 and the second transmission shaft 4 are locked, part of the power of the first motor 1 is transmitted to the first transmission shaft 3 and the second transmission shaft 3 through the inner-connection planetary row 61 and is output to the to-be-driven member on one side through the second transmission shaft 4, and the other part of the power of the first motor 1 is transmitted to the first output shaft 13 through the inner-connection planetary row 61 and the outer-connection planetary row 62 and is output to the to-be-driven member on the other side, in this process, the first transmission assembly 6 plays a role of a differential to dynamically adjust the speed difference of the to-be-driven members on both sides; in a double-motor distributed driving working condition, the first motor 1 and the second motor 2 participate in driving at the same time, at this time, the first combination 5 is disconnected, the second combination 7 is combined, the first transmission shaft 3 and the first output shaft 13 are locked, the power of the second motor 2 is transmitted to the second transmission shaft 4 through the second transmission assembly 8 and is output to the to-be-driven member on one side, and the power of the first motor 1 is transmitted to the first output shaft 13 through the first transmission assembly 6 and is output to the to-be-driven member on the other side, in this process, the first transmission assembly 6 and the second transmission assembly 8 both play a role of speed reduction.

[0043] In summary, the driving system provided by the embodiments of the present application can realize both double-motor distributed driving and single-motor driving in low-power demand working conditions, so that the power loss of the driving system is low, and the overall operation efficiency is greatly improved. In addition, the first motor 1 and the second motor 2 are coaxially distributed, and the inner-connected planetary row 61 and the outer-connected planetary row 62 in the first transmission assembly 6 are arranged in a radial stacking manner, which fully utilizes the high gear set space utilization rate of the planetary row, so that the structure of the driving system is more compact, and the overall volume and overall envelope size are smaller.

[0044] Embodiment one

[0045] Referring to Figures 1-11 As shown in the figure, the first motor 1 and the second motor 2 serve as power sources to output driving force. The first motor 1 can include a first rotor 11 and a first stator 12 located outside the first rotor 11, and the first rotor 11 further includes a first rotor shaft. For example, the first motor 1 can be a complete motor device such as the first rotor 11, the first stator 12, and a housing, etc. Alternatively, the first motor 1 can also be a collection of dispersedly arranged parts of the first rotor 11 and the first stator 12. The second motor 2 can include a second rotor 21 and a second stator 22 located outside the second rotor 21, wherein the second rotor 21 further includes a second rotor shaft.

[0046] The first motor 1 and the second motor 2 are coaxially distributed, which means that the center axis of the first motor 1 coincides with the center axis of the second motor 2. The first motor 1 is sleeved on the first transmission shaft 3, which means that the center axis of the first transmission shaft 3 coincides with the center axis of the first motor 1, and the first transmission shaft 3 is rotationally connected with the first rotor shaft of the first motor 1. The second motor 2 is sleeved on the second transmission shaft 4, which means that the center axis of the second transmission shaft 4 coincides with the center axis of the second motor 2, and the second transmission shaft 4 is rotationally connected with the second rotor shaft of the second motor 2.

[0047] The first coupling 5 is located between the first transmission shaft 3 and the second transmission shaft 4, and is used to control the power on-off between the first transmission shaft 3 and the second transmission shaft 4. For example, the first coupling 5 can be a clutch device. In other words, when the first coupling 5 is in the disengaged state, the first transmission shaft 3 and the second transmission shaft 4 are disconnected. When the first coupling 5 is in the engaged state, the first transmission shaft 3 and the second transmission shaft 4 are drivingly connected. Thus, when the first transmission shaft 3 rotates, the second transmission shaft 4 can be driven to rotate synchronously, or when the second transmission shaft 4 rotates, the first transmission shaft 3 can be driven to rotate synchronously. Therefore, in low-power demand working conditions, the first coupling 5 can be in the engaged state, so that the first motor 1 can output power to the first output shaft 13 and the second transmission shaft 4, thereby reducing the additional power loss of the driving system.

[0048] The first transmission assembly 6 can include an inner planetary row 61 and an outer planetary row 62 arranged radially outside the inner planetary row 61. The inner planetary row 61 is in transmission connection with the first motor 1, the first transmission shaft 3 and the outer planetary row 62 respectively, so that the driving force output by the first motor 1 can be transmitted into the inner planetary row 61, and a part of the driving force can be transmitted to the first transmission shaft through the inner planetary row 61, and another part of the driving force can be transmitted to the outer planetary row 62. The outer planetary row 62 is in transmission connection with the first output shaft 13, and the driving force in the outer planetary row 62 can be output through the first output shaft 13.

[0049] The second coupling member 7 is arranged between the first transmission shaft 3 and the first output shaft 13, and is used to control the power on-off of the first transmission shaft 3 and the first output shaft 13. For example, the second coupling member 7 can adopt a clutch or the like. When the second coupling member 7 is in the coupling state, the first transmission shaft 3 and the first output shaft 13 are locked, i.e., can directly transmit power, and the first transmission shaft 3 can drive the first output shaft 13 to rotate synchronously. When the second coupling member 7 is in the disconnection state, the first transmission shaft 3 and the first output shaft 13 are disconnected.

[0050] The second transmission assembly 8 is in transmission connection between the second motor 2 and the second transmission shaft 4, and the second motor 4 can drive the second transmission shaft 4 to output power through the second transmission assembly 8. It should be noted that the second transmission assembly 8 and the second motor 2 can be directly connected, or can be connected through a coupling and disconnection mechanism, and the second transmission assembly 8 and the second transmission shaft 4 can be directly connected, or can be connected through a coupling and disconnection mechanism. The second transmission assembly 8 can include a planetary row assembly and / or a parallel shaft gear set.

[0051] Referring to FIGS. 1, 2 and 3, Figure 1 Figure 2 and Figure 3 When the first coupling member 5 is in the coupling state and the second coupling member 7 is in the disconnection state, the first motor 1 works and the second motor 2 does not work, the power of the first motor 1 is transmitted into the inner planetary row 61, the inner planetary row 61 transmits the power to the outer planetary row 62 and the first transmission shaft 3 respectively, the first transmission shaft 3 drives the second transmission shaft 4 to rotate synchronously, and the outer planetary row 62 drives the first output shaft 13 to rotate. Thus, under the driving of the first motor 1, the first output shaft 13 and the second transmission shaft 4 can output power, so that in the application scenario where the driving demand is not high, the first motor 1 can be used for single motor driving, and the energy consumption and additional efficiency loss of the driving system can be reduced.

[0052] Referring to FIGS. 1, 2 and 3, Figure 4 ​As shown, when the first coupling member 5 is in the disengaged state and the second coupling member 7 is in the engaged state, the first motor 1 and the second motor 2 work simultaneously, the power of the first motor 1 is transmitted to the first transmission shaft 3 and the first output shaft 13 through the first transmission assembly 6, and the power output is performed through the first output shaft 13. The power of the second motor 2 is transmitted into the second transmission assembly 62, and the second transmission shaft 4 which is in transmission connection with the second transmission assembly 62 is driven to perform power output.

[0053] In summary, by controlling the engagement and disengagement states of the first coupling member 5 and the second coupling member 7, the first transmission assembly 6 can not only play a role of speed reduction, but also play a role of differential. When the first coupling member 5 is disengaged and the second coupling member 7 is engaged, the first motor 1 and the second motor 2 can work simultaneously and drive the first output shaft 13 and the second transmission shaft 4 respectively to realize double-motor distributed driving; when the first coupling member 5 is engaged and the second coupling member 7 is disengaged, the first motor 1 can drive the first output shaft 13 and the second transmission shaft 4 alone, and dynamically adjust the speed difference between the first output shaft 13 and the second transmission shaft 4 through the first transmission assembly 6, to realize single-motor centralized driving, thereby being applicable to driving conditions with low power demand, so as to reduce the power loss of the driving system.

[0054] In one or more embodiments, reference is made to Figures 1-11 As shown, the in-line planetary set 61 can include an in-line sun gear 611, at least two in-line planet gears 612, an in-line ring gear 613, and an in-line carrier 614. The in-line sun gear 611 is in transmission connection with the first rotor shaft of the first motor 1. The at least two in-line planet gears 612 are respectively engaged with the in-line sun gear 611, the in-line ring gear 613 is engaged with the outside of the in-line planet gears 612, and is in transmission connection with the out-line planetary set 62. The in-line carrier 614 is in transmission connection with the first transmission shaft 2, and the in-line planet gears 612 are arranged on the in-line carrier 614.

[0055] In the embodiments of the present application, the in-line sun gear 611 is in transmission connection with the first rotor shaft of the first motor 1, which can be understood as that the center axis of the in-line sun gear 611 coincides with the center axis of the first transmission shaft 3, and the in-line sun gear 611 is connected with the first rotor shaft of the first motor 1. For example, the in-line sun gear 611 can be sleeved on the first rotor shaft of the first motor 1, and is in interference fit with the first rotor shaft. When the first motor 1 works to make the first rotor shaft rotate, the in-line sun gear 611 can be driven to rotate synchronously.

[0056] At least two inner planet wheels 612 are distributed around the inner sun wheel 611, and each inner planet wheel 612 is engaged with the inner sun wheel 611 respectively, and the inner sun wheel 611 can drive all the inner planet wheels 612 to drive when rotating. The inner ring gear 613 is engaged with the outer side of the inner planet wheel 612, and is in transmission connection with the outer planet set 62. The inner planet carrier 614 is in transmission connection with the first transmission shaft 3, wherein the at least two inner planet wheels 612 are arranged on the inner planet carrier 614. For example, the axial center axis of the inner planet carrier 614 coincides with the center axis of the first transmission shaft 3, and the inner planet carrier 614 is connected with the first transmission shaft 3, so that the inner planet carrier 614 can drive the first transmission shaft 3 to rotate.

[0057] Based on the above structural design, part of the power can be transmitted to the inner planet carrier 614 and drive the first transmission shaft 3 to rotate by driving the inner sun wheel 611 to rotate by the first motor 1, and the first transmission shaft 3 can drive the second transmission shaft 4 to output power, and the other part of the power can be transmitted to the first output shaft 13 through the outer planet set 62 and output power, so as to realize that the first motor 1 drives the left and right two sides to be driven to operate, so as to reduce the additional power loss of the driving system.

[0058] In one or more embodiments, referring to Figures 1-11 As shown in the figure, the outer planet set 62 can include an outer sun wheel 621, at least two outer planet wheels 622, an outer planet carrier 623, and an outer ring gear 624. The outer sun wheel 621 is in transmission connection with the inner ring gear 613. The at least two outer planet wheels 622 are engaged with the outer sun wheel 621 respectively. The outer planet carrier 623 is fixedly connected with a stationary component, and the outer planet wheels 622 are arranged on the outer planet carrier 623. The outer ring gear 624 is engaged with the outer side of the outer planet wheel 622, and is in transmission connection with the first output shaft 13.

[0059] In the embodiment of the application, the outer sun wheel 621 is in transmission connection with the inner ring gear 613. The at least two outer planet wheels 622 are distributed on the circumferential side of the outer sun wheel 621, and are engaged with the outer sun wheel 621 respectively, so as to be driven to rotate by the outer sun wheel 621. All the outer planet wheels 622 are arranged on the outer planet carrier 623, and the outer planet carrier 623 is fixedly connected with a stationary component. Wherein, the stationary component refers to a component (such as the housing of the first motor 1 and the like) in the driving system which remains stationary, or a stationary component belonging to the vehicle, so that the outer planet carrier 623 cannot rotate under the position limitation of the stationary component. Therefore, the outer planet carrier 623 does not output power of the outer planet set 62.

[0060] The outer-connection ring gear 624 is located radially outside the outer-connection planetary gears 622 and is in engagement with all the outer-connection planetary gears 622, so that the outer-connection ring gear 624 rotates synchronously when the outer-connection planetary gears 622 rotate. The outer-connection ring gear 624 is in transmission connection with the first output shaft 13 to output power through the first output shaft 13. Thus, when the second coupling member 7 is in the coupled state, the first coupling member 5 is in the uncoupled state, and the first motor 1 operates, the first output shaft 13 rotates to output power under the drive of the first transmission shaft 3 and drives the outer-connection ring gear 624 to rotate synchronously.

[0061] Based on the above structure design, the outer-connection sun gear 621 is located radially outside the inner-connection ring gear 613 and is in transmission connection with the inner-connection ring gear 613. The outer-connection ring gear 624 is in transmission connection with the first output shaft 13, so that the power output by the first motor 1 can be transmitted to the outer-connection planetary gear set 62 through the inner-connection ring gear 613 and output through the first output shaft 13. Moreover, the structure distribution of the inner-connection planetary gear set 61 arranged radially outside the first transmission shaft 3 and the outer-connection planetary gear set 62 arranged radially outside the inner-connection planetary gear set 61 fully utilizes the high space utilization rate of the gear set in the planetary gear set, so that the structure of the drive system is relatively compact, a more complex transmission function can be realized in a smaller assembly space, the stability of power transmission can be ensured, and the weight and volume of the drive system as a whole are reduced.

[0062] In one or more embodiments, the outer-connection sun gear 621 is integrally formed with the inner-connection ring gear 613.

[0063] In the embodiments of the present application, the inner-connection ring gear 613 is provided with a gear groove radially outside the inner-connection ring gear 613 for engagement with the outer-connection planetary gears 622. Thus, the inner-connection ring gear 613 can also serve as the outer-connection sun gear 621, and the same device is used to form the inner-connection ring gear 613 and the outer-connection sun gear 621, which can reduce the structural complexity of the first transmission assembly 6. Moreover, the weight and volume of the first transmission assembly 6 can be further reduced, the structure of the drive system is more compact, and the volume and overall envelope size can be further reduced.

[0064] In one or more embodiments, referring to Figures 1-11 As shown in the figure, the drive system can further include a third coupling member 9 arranged between the first rotor shaft of the first motor 1 and the second rotor shaft of the second motor 2 to control the power on-off between the first rotor shaft and the second rotor shaft.

[0065] In the embodiments of the present application, the third coupling member 9 is used to control the power on-off between the first rotor shaft of the first motor 1 and the second rotor shaft of the second motor 2. For example, the third coupling member 9 can be a clutch or the like. When the third coupling member 9 is in the disconnected state, the first rotor shaft and the second rotor shaft are disconnected and cannot transmit power. When the third coupling member 9 is in the connected state, the first rotor shaft and the second rotor shaft are connected to form a transmission connection.

[0066] Thus, based on the above structural design, the transmission connection relationship between the first rotor shaft and the second rotor shaft can be controlled by the connection or disconnection of the third coupling member 9, and the output torque of the first rotor shaft or the second rotor shaft can be changed, so as to be suitable for the driving working condition requiring large torque output. In the working condition requiring extremely large torque output, for example, when one side of the vehicle loses adhesion, the third coupling member 9 is connected so that the power output by the first motor 1 and the second motor 2 is superimposed and output to the first output shaft 13 and the second transmission shaft 4, which can make the vehicle better escape from the trouble.

[0067] In one or more embodiments, referring to Figures 1-11 As shown in the figure, the driving system further includes a fourth coupling member 10, which is arranged between the second transmission assembly 8 and the second transmission shaft 4, and is used to control the power on-off between the second transmission assembly 8 and the second transmission shaft 4.

[0068] In the embodiments of the present application, the fourth coupling member 10 is located between the second transmission assembly 8 and the second transmission shaft 4. The fourth coupling member 10 can be a bidirectional clutch or the like. When the fourth coupling member 10 is in the disconnected state, the second transmission assembly 8 and the second transmission shaft are disconnected. When the fourth coupling member 10 is in the connected state, the second transmission assembly 8 and the second transmission shaft 4 are in transmission connection.

[0069] Based on the above structural design, the power on-off between the second motor 2 and the second transmission shaft 4 can be controlled by the connection or disconnection of the fourth coupling member 10. For example, when the second motor 2 needs to generate power or participate in driving, the fourth coupling member 10 can be connected, and at this time, the second motor 2 and the second transmission shaft 4 are in transmission connection. For another example, when the second motor 2 does not need to work or participate in driving, the fourth coupling member 10 can be disconnected, and the power on the second transmission shaft 4 will not be transmitted to the second motor 2 to cause the second motor 2 to be dragged. Thus, the drag loss can be avoided, and the overall driving efficiency of the driving system can be improved.

[0070] In one or more embodiments, referring to Figures 1-11As shown, the second transmission assembly 8 can include an inner sun gear 81, at least two first planetary gears 82, at least two second planetary gears 83, an inner ring gear 84, and an inner carrier 85. The inner sun gear 81 is in driving connection with the second rotor shaft of the second motor 2. The at least two first planetary gears 82 are respectively in meshing connection with the inner sun gear 81. The at least two second planetary gears 83 are in driving connection with the first planetary gears 82. The inner ring gear 84 is in meshing connection with the second planetary gears 83, and the inner ring gear 84 is fixedly connected with a stationary part. The inner carrier 85 is connected between the second transmission shaft 4 through the fourth connecting member 10. The first planetary gears 82 and the second planetary gears 83 are coaxially arranged on the inner carrier 85.

[0071] In the embodiments of the present application, the inner sun gear 81 is in driving connection with the second rotor shaft of the second motor 2. When the second motor 2 works, the inner sun gear 81 rotates synchronously with the second rotor shaft of the second motor 2. The number of the second planetary gears 83 can be consistent with the number of the first planetary gears 82. Correspondingly, the first planetary gears 82 and the second planetary gears 83 are connected through the inner carrier 85, so that the second planetary gears 83 are driven to rotate by the inner carrier 85 in the case that the first planetary gears 82 rotate. The inner ring gear 84 is located outside the second planetary gears 83 and is in meshing connection with the second planetary gears 83. The inner ring gear 84 is fixedly connected with a stationary part. The stationary part refers to a part that remains stationary in the drive system (such as the housing of the second motor 2 and the like) or a stationary part belonging to the vehicle, so that the position of the stationary part limits the rotation of the inner ring gear 84. Therefore, the inner ring gear 84 does not serve as the power output of the second transmission assembly 8.

[0072] Since the inner ring gear 84 is fixed, the first planetary gears 82 and the second planetary gears 83 drive the inner carrier 85 to rotate. The inner carrier 85 is connected between the second transmission shaft 4 through the fourth connecting member 10. In some embodiments, the second transmission assembly 8 can be a double inner meshing planetary row (also referred to as a NW type planetary row).

[0073] Based on the above structural design, the second transmission assembly 8 can achieve the adjustment requirement of different rotating speeds on the basis of simplifying the structure of the second transmission assembly 8 and reducing the assembly space, and further reduce the overall volume and overall weight of the drive system.

[0074] In one or more embodiments, the diameter of the first planetary gears 82 is smaller than the diameter of the second planetary gears 83.

[0075] In the embodiments of the present application, when the rotating power is input from the first planetary gears 82 with smaller diameter to drive the second planetary gears 83 with larger diameter, the transmission ratio becomes larger, thereby achieving the effect of speed reduction and torque increase.

[0076] In one or more embodiments, with reference to Figures 1-11As shown, the driving system can further include the engine 11 and a fifth coupling member 12, which is arranged between the second transmission assembly 8 and the engine 11, to control the power on-off between the engine 11 and the second transmission assembly 8.

[0077] In the embodiment, the fifth coupling member 12 is arranged between the second transmission assembly 8 and the engine 11. That is, the engine 11, the fifth coupling member 12 and the second motor 2 can form a power generation system, so that the driving system can increase a range extending mode. When the fifth coupling member 12 is in the coupling state, the engine 11 and the second transmission assembly 8 are coupled to each other to form a transmission connection. When the engine 11 works, the rotating power output by the engine 11 can be transmitted to the second transmission assembly 8, and the power output by the inner sun gear 81 in the second transmission assembly 8, so as to drive the second rotor shaft of the second motor 2 to rotate to generate power. When the fifth coupling member 12 is in the disconnection state, the engine 11 and the second transmission assembly 8 are separated from each other to disconnect the transmission connection.

[0078] In one or more embodiments, the second transmission assembly 8 further includes a carrier gear ring, wherein the carrier gear ring is arranged at the radial outer side of the inner carrier 85, and when the fifth coupling member 12 is in the coupling state, the engine 11 drives the carrier gear ring to rotate and drives the inner sun gear 81 to rotate.

[0079] In summary, based on the above structure design, the driving system can increase the range extending mode, and can supplement energy through the range extending mode, without the need of additionally increasing a power generator, so as to reduce the overall weight and overall volume of the driving system, and greatly reduce the production cost of the driving system.

[0080] Based on the above structure, the driving system of the embodiment can form the working modes according to the action combinations of different coupling members, as shown in Table 1:

[0081] Table 1: Mapping table between the action combinations of different coupling members of the driving system and the working modes

[0082]

[0083] In combination with Table 1, when the first coupling member 5, the second coupling member 7, the third coupling member 9, the fourth coupling member 10 and the fifth coupling member 12 are all in the disconnection state, and the first motor 1, the second motor 2 and the engine 11 are all not working, the driving system runs in the coasting mode. As shown in Figure 1 and Figure 2 At this time, the first output shaft 13 and the second transmission shaft 4 follow the external load to rotate, the first motor 1 and the second motor 2 do not generate back electromotive force and do not generate energy loss.

[0084] Referring toFigure 3 As shown, when the first coupling member 5 is in the coupled state, and the other coupling members are in the uncoupled state, and the first motor 1 is driven, and the second motor 2 and the engine 11 are not working, the drive system runs in the single motor output mode. The first motor 1 works to drive the first transmission shaft 3 to rotate, and at the same time drives the second transmission shaft 4 to rotate for power output. The inner planetary gear set 61 drives the outer planetary gear set 62 for power transmission, so as to output power through the first output shaft 13 which is in transmission connection with the outer planetary gear set 62. Among them, the inner planetary gear set 61 plays a differential role, so that the power of the first motor 1 can be output through the first transmission shaft 3 which is in transmission connection with the inner planetary gear set 61 and the first output shaft 13 which is in transmission connection with the outer planetary gear set 62, realizing the single motor driving of the first output shaft 13 and the second transmission shaft 4. In the low power demand, the drive system running in the single motor output mode can reduce the power loss of the drive system.

[0085] Referring to Figure 4 As shown, when the second coupling member 7 and the fourth coupling member 10 are in the coupled state, and the other coupling members are in the uncoupled state, and the first motor 1 and the second motor 2 are driven, and the engine 11 is not working, the drive system runs in the dual motor distributed drive mode. In this mode, the power of the first motor 1 is transmitted to the first transmission shaft 3 and the first output shaft 13 through the first transmission assembly 6, and is output through the first output shaft 13. The second motor 2 is used to drive the second transmission assembly 8 to drive the second transmission shaft 4 for power output. Thus, the power output of the first output shaft 13 and the second transmission shaft 4 can be realized through the respective driving of the two motors.

[0086] Referring to Figure 5 As shown, when the first coupling member 5 and the third coupling member 9 are in the coupled state, and the other coupling members are in the uncoupled state, and the first motor 1 and the second motor 2 are driven, and the engine 11 is not working, the drive system runs in the dual motor concentrated drive mode. In this mode, the first rotor shaft of the first motor 1 and the second rotor shaft of the second motor 2 are combined with each other to form transmission connection, so that the two motors can be combined together to drive the inner planetary gear set 61 for power transmission, and the inner planetary gear set 61 drives the outer planetary gear set 62 to output power through the first output shaft 13. And the inner planetary gear set 61 drives the second transmission shaft 4 for power output. Thus, the inner planetary gear set 61 on one side can be driven by the dual motor combination, which can provide larger torque output, and the power output does not need to pass through the second transmission assembly 8, so as to reduce the transmission loss.

[0087] Referring to Figure 6As shown, when the first coupling member 5 and the fifth coupling member 12 are in the disengaged state, and the other coupling members are in the engaged state, and the first motor 1 and the second motor 2 are driven, and the engine 11 is not working, the driving system runs in the double-motor differential lock first output mode. In this mode, the first rotor shaft of the first motor 1 and the second rotor shaft of the second motor 2 are combined to form a transmission connection. The power of the double-motor is transmitted to the first transmission shaft 3 and the first output shaft 13 through the first transmission assembly 6, and is output through the first output shaft 13. Moreover, the double-motor drives the second transmission assembly 8, and outputs power through the second transmission shaft 4 in transmission connection with the second transmission assembly 8. By combining the first rotor shaft and the second rotor shaft together and simultaneously outputting power, the torque output through the first output shaft 13 and the torque output through the second transmission shaft 4 can be greatly improved, which can be applied to driving working conditions requiring output of super large torque.

[0088] Referring to Figure 7 As shown, when the fifth coupling member 12 is in the disengaged state, and the other coupling members are in the engaged state, and the first motor 1 and the second motor 2 are driven, and the engine 11 is not working, the driving system runs in the double-motor differential lock second output mode. In this mode, the power of the double-motor is transmitted to the first transmission shaft 3 and the first output shaft 13 through the first transmission assembly 6, and is output through the first output shaft 13, and the first transmission shaft 3 simultaneously drives the second transmission shaft 4 to rotate. Moreover, the double-motor drives the second transmission assembly 8, and outputs power through the second transmission shaft 4 in transmission connection with the second transmission assembly 8.

[0089] Referring to Figure 8 As shown, when the fourth coupling member 10 and the fifth coupling member 12 are in the disengaged state, and the other coupling members are in the engaged state, and the first motor 1 and the second motor 2 are driven, and the engine 11 is not working, the driving system runs in the double-motor differential lock third output mode. In this mode, the power of the double-motor is transmitted to the first transmission shaft 3 and the first output shaft 13 through the first transmission assembly 6, and is output through the first output shaft 13. At the same time, the first transmission shaft 3 simultaneously drives the second transmission shaft 4 to rotate, and outputs power through the second transmission shaft 4. In the embodiment of the application, the application scenarios of the double-motor differential lock second output mode and the double-motor differential lock third output mode can be the same as the application scenario of the double-motor differential lock first output mode, and are applicable to driving working conditions requiring output of large torque. For example, when one side of the vehicle loses adhesion, the third coupling member is combined to make the power output by the first motor 1 and the second motor 2 superimposed and output to the first output shaft 13 and the second transmission shaft 4, which can make the vehicle better escape from the trouble.

[0090] Referring to Figure 9As shown, when the first coupling member 5 and the fifth coupling member 12 are in the coupled state, and the other coupling members are in the uncoupled state, and the first motor 1 is driven, the second motor 2 is powered and the engine 11 is driven, the drive system operates in the single motor centralized output extended range mode. In this mode, the first motor 1 drives the first output shaft 13 and the second transmission shaft 4 to output power, the second motor 2 is transmissionally connected with the engine 11 through the second transmission assembly 8, and the second motor 2 is driven by the engine 11 to rotate and generate power, so that the drive system can be powered by the operation of the engine 11 when the battery power is low.

[0091] Referring to Figure 10 As shown, when the first coupling member 5 and the second coupling member 7 are in the coupled state, and the other coupling members are in the uncoupled state, and the first motor 1 is driven, the second motor 2 is not working and the engine 11 is not working, the drive system operates in the single motor differential lock output mode. In this mode, the first output shaft 13, the first transmission shaft 3 and the second transmission shaft 4 are locked together, and the power of the first motor 1 is output to the two sides of the driven member through the first output shaft 13, the first transmission shaft 3 and the second transmission shaft 4.

[0092] Referring to Figure 11 As shown, when the second coupling member 7 and the fourth coupling member 10 are in the uncoupled state, and the other coupling members are in the coupled state, and the first motor 1, the second motor 2 and the engine 11 are all driven, the drive system operates in the three power source output mode. In this mode, the engine 11, the first motor 1 and the second motor 2 drive the in-line planetary gear set 61 to rotate, and then drive the second transmission shaft 4 to output power, and at the same time drive the outer planetary gear set 62 through the in-line planetary gear set 61, and then drive the first output shaft 13 to output power. Thus, the three power sources in the drive system can output power at the same time. The drive system operating in the three power source output mode can quickly increase the acceleration rate of the external driving load, and is suitable for driving conditions requiring fast acceleration, such as vehicle launch and other application scenarios.

[0093] In summary, the drive system can switch between different operating modes by combining the coupled and uncoupled states of the coupling members, thereby enriching the power output modes of the drive system and expanding the power output adaptability of the drive system in different driving conditions.

[0094] Embodiment Two

[0095] The first transmission assembly 6 can further include an in-line planetary gear set 61, an outer planetary gear set 62 distributed along the radial outer side of the in-line planetary gear set 61, and a linking planetary gear set distributed along the radial outer side of the outer planetary gear set 62. Thus, the first output shaft 13 can be driven by the superposition of multiple planetary gear sets in the radial direction of the first transmission shaft 3 to output power with different transmission ratios.

[0096] The embodiment of the present application also provides a vehicle, which can comprise a first wheel 14, a second wheel 15 and the driving system of any one of the above embodiments, the first wheel 14 being connected with the first output shaft 13, and the second wheel 15 being connected with the second transmission shaft 4.

[0097] In the embodiment of the present application, the vehicle can comprise a first wheel 14 and a second wheel 15, wherein the first wheel 14 and the second wheel 15 can be front wheels of the vehicle, or can be rear wheels of the vehicle, in other words, the vehicle can be front drive or rear drive, or can be four-wheel drive, which is not limited here. The vehicle with the driving system of any one of the above embodiments can comprise a first wheel 14 connected with the first output shaft 13 and a second wheel 15 connected with the second transmission shaft 4. The first transmission shaft 3 and the second transmission shaft 4 can be combined through the first combining member 5 arranged therebetween, so that the first transmission shaft 3 and the second transmission shaft 4 are in driving connection, thereby achieving power output of the first output shaft 13 and the second transmission shaft 4 by one motor in a low power demand working condition, and reducing the additional efficiency loss of the driving system. In addition, the first motor 1 and the second motor 2 are coaxially arranged in the embodiment of the present application, and the inner-connected planetary row 61 and the outer-connected planetary row 62 in the first transmission assembly 6 are arranged in a radial stacking manner, so that the high gear set space utilization rate of the planetary row is fully utilized, the structure of the driving system is more compact, and the overall volume and overall envelope size are smaller.

[0098] Term explanation

[0099] In the present application, the first transmission assembly 6 can comprise at least two radially stacked planetary rows.

[0100] In the present application, the plurality refers to two or more than two.

[0101] In the present application, unless otherwise explicitly limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0102] The terms "first", "second", "third", "fourth" and the like (if any) in the present application are used to distinguish similar objects, and do not necessarily describe a specific order or sequence.

[0103] The term "and / or", within the context of the present application, is to be taken as a specific interpretation of the associating relationship between associated objects, indicating that there can be three relationships, for example, A and / or B can indicate that there are three cases of A alone, A and B together, and B alone. In addition, the character " / " in the present application generally indicates that the associated objects before and after are in an "or" relationship.

[0104] Unless otherwise specified, all steps in the present application can be performed in sequence or randomly. For example, a method includes steps A and B, indicating that the method can include sequentially performed steps A and B, or sequentially performed steps B and A. For example, it is mentioned that the method can further include step C, indicating that step C can be added to the method in any order, for example, the method can include steps A, B and C, or steps A, C and B, or steps C, A and B, etc.

[0105] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A drive system characterized by, The drive system comprises: a first motor and a second motor coaxially distributed; a first transmission shaft, the first motor being sleeved on the first transmission shaft; a second transmission shaft, the second motor being sleeved on the second transmission shaft; a first coupling member arranged between the first transmission shaft and the second transmission shaft to control the power on-off between the first transmission shaft and the second transmission shaft; a first transmission assembly, the first transmission assembly comprising an in-line planetary gear set and an out-line planetary gear set arranged radially outside the in-line planetary gear set, the in-line planetary gear set being in transmission connection with the first motor, the first transmission shaft and the out-line planetary gear set respectively; a first output shaft in transmission connection with the out-line planetary gear set; a second coupling member arranged between the first transmission shaft and the first output shaft to control the power on-off between the first transmission shaft and the first output shaft; a second transmission assembly in transmission connection between the second motor and the second transmission shaft.

2. The drive system of claim 1, wherein, The in-line planetary gear set comprises: an in-line sun gear in transmission connection with a first rotor shaft of the first motor; at least two in-line planet gears, the at least two in-line planet gears being in meshing with the in-line sun gear respectively; an in-line ring gear in meshing with the outside of the in-line planet gears and in transmission connection with the out-line planetary gear set; an in-line planet carrier in transmission connection with the first transmission shaft, the in-line planet gears being arranged on the in-line planet carrier.

3. The drive system of claim 2, wherein, The out-line planetary gear set comprises: an out-line sun gear in transmission connection with the in-line ring gear; at least two out-line planet gears, the at least two out-line planet gears being in meshing with the out-line sun gear respectively; an out-line planet carrier in fixed connection with a stationary component, the out-line planet gears being arranged on the out-line planet carrier; an out-line ring gear in meshing with the outside of the out-line planet gears and in transmission connection with the first output shaft.

4. The drive system of claim 3, wherein, The in-line ring gear and the out-line sun gear are integrally formed.

5. The drive system of claim 1, wherein, The drive system further comprises a third coupling member arranged between a first rotor shaft of the first motor and a second rotor shaft of the second motor to control the power on-off between the first rotor shaft and the second rotor shaft.

6. The drive system of claim 1, wherein, The drive system further comprises a fourth coupling member arranged between the second transmission assembly and the second transmission shaft to control the power on-off between the second transmission assembly and the second transmission shaft.

7. The drive system of claim 6, wherein, The second transmission assembly comprises: an in-sun gear in transmission connection with a second rotor shaft of the second motor; at least two first planet gears, the at least two first planet gears being in meshing with the in-sun gear respectively; at least two second planet gears in transmission connection with the first planet gears; an in-ring gear in meshing with the second planet gears, the in-ring gear being in fixed connection with a stationary component; An inner planet carrier connected with the second transmission shaft through the fourth coupling, the first and second planet wheels coaxially arranged on the inner planet carrier.

8. The drive system of claim 7, wherein, The diameter of the first planet wheel is smaller than that of the second planet wheel.

9. The drive system of claim 1, wherein, The drive system further comprises: An engine; A fifth coupling arranged between the second transmission assembly and the engine to control the power on-off between the engine and the second transmission assembly.

10. A vehicle characterized by comprising: The vehicle comprises a first wheel connected with the first output shaft, a second wheel connected with the second transmission shaft, and the drive system according to any one of claims 1-9.

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