Power transmission system and vehicle

Abstract

The invention discloses a power transmission system and a vehicle, the power transmission system comprises a first wheel, a second wheel, a third wheel and a fourth wheel; the first motor is arranged to be in power connection with the first wheel or to be in power connection with the first wheel and the second wheel at the same time, and the second motor is arranged to be in power connection with the second wheel or to be in power connection with the first wheel and the second wheel at the same time; the range extender is selectively in power connection with the first motor; the third motor is in power connection with the third wheel, and the fourth motor is in power connection with the fourth wheel. According to the power transmission system, independent driving of all the wheels can be achieved, the escape capacity is improved, the number of independent generators can be reduced, the first motor and the second motor can drive the first wheel and the second wheel, and the power performance of the vehicle during pure electric driving can be enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle manufacturing, and in particular to a power transmission system and a vehicle having the power transmission system. Background Art

[0002] With the continuous penetration of new energy technologies, more and more car companies have their own new energy routes. In off-road vehicles, the traditional ICE (internal combustion engine) power has high fuel consumption due to the large displacement of the engine, and it is difficult to meet future fuel consumption regulations. All car companies are exploring new energy technology routes for off-road vehicles. In related technologies, independent motors and range extenders are used to achieve power generation. The number of motors is large, the setting cost is high, and the ability of each wheel to get out of trouble is low, which cannot adapt to relatively complex road conditions. There is room for improvement. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a power transmission system, which can not only drive four wheels independently through four motors to improve the ability to get out of trouble, but also use one of the motors as a range-extending motor to reduce the installation cost.

[0004] According to an embodiment of the present invention, a power transmission system includes: a first wheel, a second wheel, a third wheel and a fourth wheel; a first motor and a second motor, wherein the first motor is configured to be power-connected to the first wheel or to the first wheel and the second wheel at the same time, and the second motor is configured to be power-connected to the second wheel or to the first wheel and the second wheel at the same time; a range extender, wherein the range extender is selectively power-connected to the first motor; a third motor and a fourth motor, wherein the third motor is power-connected to the third wheel, and the fourth motor is power-connected to the fourth wheel.

[0005] According to the power transmission system of the embodiment of the present invention, each wheel can be driven independently, which is beneficial to improving the vehicle's ability to escape from difficulties and reducing the setting of a separate generator. When the first motor is generating electricity, the effective driving of each wheel can still be guaranteed, ensuring the power of the vehicle during the power generation process. The first motor and the second motor can both drive the first wheel and the second wheel, which is beneficial to enhancing the power of the vehicle when it is driven purely electrically.

[0006] According to some embodiments of the present invention, the power transmission system also includes a differential, the first wheel is connected to a first axle, the second wheel is connected to a second axle, and the differential is respectively connected to the first axle and the second axle in terms of power; wherein the first motor is selectively connected to the first axle and the differential in terms of power, and the second motor is selectively connected to the second axle and the differential in terms of power.

[0007] A power transmission system according to some embodiments of the present invention further includes a first input shaft, which is power-connected to the first motor. The first input shaft is provided with a first transmission gear, a second transmission gear, and a first synchronizer. The first synchronizer is used to power-connect the first input shaft to the first transmission gear or the second transmission gear. The first output shaft is provided with a first output gear that meshes with the first transmission gear, and the differential is provided with a differential gear that meshes with the second transmission gear; and / or, it further includes a second input shaft, which is power-connected to the second motor. The second input shaft is provided with a third transmission gear, a fourth transmission gear, and a second synchronizer. The second synchronizer is used to power-connect the second input shaft to the third transmission gear or the fourth transmission gear. The second output shaft is provided with a second output gear that meshes with the third transmission gear, and the differential is provided with a differential gear that meshes with the fourth transmission gear.

[0008] In the power transmission system according to some embodiments of the present invention, the first motor is provided with a first motor gear, and the first input shaft is provided with a first input gear, and the first input gear meshes with the first motor gear; and / or, the second motor is provided with a second motor gear, and the second input shaft is provided with a second input gear, and the second input gear meshes with the second motor gear.

[0009] In the power transmission system according to some embodiments of the present invention, the axis of the first output shaft coincides with the axis of the second output shaft, and the first motor and the second motor are respectively located on the front and rear sides of the first output shaft.

[0010] The power transmission system according to some embodiments of the present invention further includes an extender gear. The first motor is connected to a first motor gear, the first motor gear meshes with the extender gear, and a clutch is provided between the extender gear and the extender.

[0011] In the power transmission system according to some embodiments of the present invention, the third wheel is connected to a third output shaft, the third output shaft is provided with a third output gear, the third motor is provided with a third motor gear, and the third motor gear is power-connected to the third output gear through a gear set; the fourth wheel is connected to a fourth output shaft, the fourth output shaft is provided with a fourth output gear, the fourth motor is provided with a fourth motor gear, and the fourth motor gear is power-connected to the fourth output gear through a gear set.

[0012] In the power transmission system according to some embodiments of the present invention, the first wheel and the second wheel are both set as front wheels, and the third wheel and the fourth wheel are both set as rear wheels.

[0013] According to some embodiments of the present invention, for the power transmission system, both the range extender and the first motor are located in front of the front wheel axle, and the second motor is located between the front wheel axle and the rear wheel axle; and / or, both the third motor and the fourth motor are located behind the rear wheel axle.

[0014] The present invention also provides a vehicle.

[0015] The vehicle according to the embodiments of the present invention is provided with the power transmission system according to any of the above embodiments.

[0016] The vehicle and the above power transmission system have the same advantages as compared with the prior art, and will not be elaborated herein.

[0017] The additional aspects and advantages of the present invention will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present invention. Description of the Drawings

[0018] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0019] Figure 1 is a schematic structural diagram of a power transmission system according to an embodiment of the present invention.

[0020] Reference Numerals:

[0021] Power transmission system 100,

[0022] First wheel 11, second wheel 12, third wheel 13, fourth wheel 14,

[0023] First motor 21, first motor gear 211, second motor 22, second motor gear 221, third motor 23, third motor gear 231, fourth motor 24, fourth motor gear 241, range extender 25, range extender gear 251,

[0024] First wheel axle 31, first output gear 311, second wheel axle 32, second output gear 321, third wheel axle 33, third output gear 331, fifth transmission gear 332, sixth transmission gear 333, fourth wheel axle 34, fourth output gear 341, seventh transmission gear 342, eighth transmission gear 343, first input shaft 35, first input gear 351, first transmission gear 352, second transmission gear 353, second input shaft 36, second input gear 361, third transmission gear 362, fourth transmission gear 363,

[0025] First synchronizer 41, second synchronizer 42, clutch 43,

[0026] Differential 5, differential gear 51. Detailed implementation manners

[0027] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or a power connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0030] Unless otherwise specified, the front-rear direction in this application is the longitudinal direction of the vehicle, i.e., the X direction; the left-right direction is the transverse direction of the vehicle, i.e., the Y direction; and the up-down direction is the vertical direction of the vehicle, i.e., the Z direction.

[0031] Next, refer to Figure 1 Describe the power transmission system 100 according to an embodiment of the present invention. By providing the power transmission system 100, the four wheels of the vehicle can be independently driven, enabling each wheel to have an independent ability to escape from trouble. At the same time, one of the motors corresponding to the wheels can be used as a range extender motor to cooperate with the range extender 25, eliminating the need to provide a separate generator for cooperating with the range extender 25, thereby reducing the number of motors provided and lowering the installation cost.

[0032] As Figure 1As shown, a power transmission system 100 according to an embodiment of the present invention includes: a first wheel 11, a second wheel 12, a third wheel 13, a fourth wheel 14, a first motor 21, a second motor 22, a range extender 25, a third motor 23, and a fourth motor 24.

[0033] The first wheel 11, the second wheel 12, the third wheel 13, and the fourth wheel 14 are respectively the four wheels of the vehicle. In other words, the power transmission system 100 in the present invention is applicable to four-wheel vehicle models. That is, one of the first wheel 11, the second wheel 12, the third wheel 13, and the fourth wheel 14 is the left front wheel of the vehicle, one is the right front wheel, one is the left rear wheel, and one is the right rear wheel. That is to say, in actual design, the first wheel 11, the second wheel 12, the third wheel 13, and the fourth wheel 14 can be flexibly paired with the left front wheel, the right front wheel, the left rear wheel, and the right rear wheel. That is, the first wheel 11 is not limited to the left front wheel and can also be other wheels, and the same applies to other wheels. The setting method is flexibly selectable.

[0034] The first motor 21 is arranged to be power-connected to the first wheel 11 or simultaneously to the first wheel 11 and the second wheel 12. That is to say, the first motor 21 can be used to drive the first wheel 11 alone or simultaneously drive the first wheel 11 and the second wheel 12, which is beneficial to increasing the uses of the first motor 21. At the same time, the second motor 22 is arranged to be power-connected to the second wheel 12 or simultaneously to the first wheel 11 and the second wheel 12, that is, the second motor 22 can be used to drive the second wheel 12 alone or simultaneously drive the first wheel 11 and the second wheel 12. Among them, during actual operation, when the first motor 21 drives the first wheel 11 alone, the second wheel 12 can be driven alone by the second wheel 12, so as to realize the simultaneous driving of the first wheel 11 and the second wheel 12. Or when the first motor 21 drives the first wheel 11 and the second wheel 12 simultaneously, the second motor 22 can also drive the first wheel 11 and the second wheel 12 simultaneously, so that the power states of the first wheel 11 and the second wheel 12 can be flexibly selected to realize power switching in different modes.

[0035] In addition, the range extender 25 is selectively power-connected to the first motor 21. That is to say, the range extender 25 can be selectively power-connected or power-disconnected from the first motor 21. Among them, it should be noted that the range extender 25 can be an engine. When the engine is power-connected to the first motor 21, the engine can drive the first motor 21 to generate electricity. Thus, the first motor 21 in the present invention can be used both for active power generation in cooperation with the range extender 25 and for driving the first wheel 11 alone or simultaneously driving the first wheel 11 and the second wheel 12 to rotate, realizing a setting with multiple uses.

[0036] Among them, it should be noted that the first motor 21 and the second motor 22 can both drive the first wheel 11 and the second wheel 12, that is, the first wheel 11 and the second wheel 12 can be two wheels facing each other in the transverse direction, such as the first wheel 11 and the second wheel 12 are both two front wheels, or the first wheel 11 and the second wheel 12 are both two rear wheels, which is convenient for realizing the path arrangement and power transmission from the first motor 21 and the second motor 22 to the wheels.

[0037] The third motor 23 is connected to the third wheel 13 by power, and the fourth motor 24 is connected to the fourth wheel 14 by power, so that the third motor 23 can drive the third wheel 13 to output power, and the fourth motor 24 can drive the fourth wheel 14 to output power, so that both the third wheel 13 and the fourth wheel 14 can be driven separately. Therefore, the power transmission system 100 of the present invention can be applied to four-wheel drive vehicles.

[0038] Thus, the first wheel 11, the second wheel 12, the third wheel 13 and the fourth wheel 14 in the present invention can be driven by a separate motor, so that each wheel can rotate independently, which is conducive to improving the overall escape ability of the vehicle, adapting to different types of running road conditions, and improving the vehicle power performance; at the same time, the first motor 21 can be used to drive the first wheel 11 for power driving, and can also be used as a generator to cooperate with the range extender 25 for power, so as to realize the setting of two functions of the same motor, reduce the setting of a separate power generator, and reduce the setting cost. When the first motor 21 is running as a generator, the second motor 22 can also drive the first wheel 11 and the second wheel 12 for power driving at the same time, which can well avoid the problem that the first wheel 11 cannot be effectively driven when the first motor 21 is used for power generation, and ensure the power state of each wheel, and the first motor 21 does not need to be used for power generation and driving at the same time, which reduces the working difficulty of the first motor 21 and ensures the reliability of the power transmission system 100. And when the first motor 21 and the second motor 22 actively drive the first wheel 11 and the second wheel 12 at the same time, the power of the first wheel 11 and the second wheel 12 can be enhanced.

[0039] According to the power transmission system 100 of the embodiment of the present invention, each wheel can be driven independently, which is beneficial to improving the escape ability of the whole vehicle and can reduce the setting of a separate generator. When the first motor 21 is generating electricity, it can still ensure the effective driving of each wheel and ensure the dynamic performance of the vehicle during the power generation process. The first motor 21 and the second motor 22 can both drive the first wheel 11 and the second wheel 12, which is beneficial to enhancing the dynamic performance of the vehicle when it is driven purely electrically.

[0040] In some embodiments, the powertrain 100 further includes a differential 5. The first wheel 11 is connected to a first axle 31, and the second wheel 12 is connected to a second axle 32. The differential 5 is respectively in power connection with the first axle 31 and the second axle 32. As Figure 1 shown, the differential 5 is located between the first axle 31 and the second axle 32, and the differential 5 can be simultaneously in power connection with the first axle 31 and the second axle 32.

[0041] Among them, the first motor 21 is selectively in power connection with the first axle 31 and the differential 5. That is to say, the first motor 21 can be either in power connection with the first axle 31 or selectively in power connection with the differential 5. Specifically, when the first motor 21 is in power connection with the first axle 31, the first motor 21 can be used to independently drive the first wheel 11 to rotate. When the first motor 21 is in power connection with the differential 5, the first motor 21 can be used to drive the first wheel 11 and the second wheel 12 to rotate. Similarly, the second motor 22 is selectively in power connection with the second axle 32 and the differential 5. The second motor 22 can be either in power connection with the second axle 32 or selectively in power connection with the differential 5. Specifically, when the second motor 22 is in power connection with the second axle 32, the second motor 22 can be used to independently drive the second wheel 12 to rotate. When the second motor 22 is in power connection with the differential 5, the second motor 22 can be used to drive the first wheel 11 and the second wheel 12 to rotate.

[0042] And in the specific design, the first axle 31 and the second axle 32 can be simultaneously set as front axles, or can be simultaneously set as rear axles. For example, one of the first axle 31 and the second axle 32 is set as the left front axle, and the other is set as the right front axle. The differential 5 is arranged between the left front axle and the right front axle, so that when the power of the first motor 21 or the second motor 22 is transmitted to the differential 5, the power can be respectively output from the differential 5 to the first wheel 11 and the second wheel 12. Specifically, as Figure 1 shown, the first motor 21 is selectively in power connection with the right front axle, the second motor 22 is selectively in power connection with the left front axle, and the first axle 31 is set as the right front axle, and the second axle 32 is set as the left front axle.

[0043] In some embodiments, the powertrain 100 further includes a first input shaft 35. The first input shaft 35 is in power connection with the first motor 21. The first input shaft 35 is provided with a first transmission gear 352, a second transmission gear 353, and a first synchronizer 41. The first synchronizer 41 is used to power-connect the first input shaft 35 with the first transmission gear 352 or the second transmission gear 353. That is to say, the first motor 21 can transmit power to the first input shaft 35, and by switching the state of the first synchronizer 41, the power can be flexibly input from the first input shaft 35 to the first transmission gear 352 or the second transmission gear 353.

[0044] The first wheel shaft 31 is provided with a first output gear 311 that meshes with the first transmission gear 352. As Figure 1 shown, a first output gear 311 is sleeved outside the first wheel shaft 31. The first output gear 311 is in circumferential transmission cooperation with the first wheel shaft 31. In this way, when the first synchronizer 41 power-connects the first transmission gear 352 with the first input shaft 35, the power on the first motor 21 can be transmitted to the first wheel shaft 31 through the first input shaft 35, the first transmission gear 352, and the first output gear 311, and then the first wheel 11 can be driven to rotate alone. Also, the differential 5 is provided with a differential gear 51 that meshes with the second transmission gear 353. As Figure 1 shown, a differential gear 51 is provided outside the housing of the differential 5. The differential gear 51 and the housing of the differential 5 are an integral whole. In this way, when the first synchronizer 41 power-connects the second transmission gear 353 with the first input shaft 35, the power on the first motor 21 can be transmitted to the differential 5 through the first input shaft 35, the second transmission gear 353, and the differential gear 51, and then be transmitted from the differential 5 to the first wheel shaft 31 and the second wheel shaft 32 respectively, realizing the co-driving of the first wheel 11 and the second wheel 12.

[0045] Thus, the first motor 21 can cooperate with the first transmission gear 352, the second transmission gear 353, and the first synchronizer 41 on the first input shaft 35 to realize the switching of the power output state, and flexibly select to drive the first wheel 11 alone or drive the first wheel 11 and the second wheel 12 simultaneously. It should be noted that the first synchronizer 41 has three working positions. As Figure 1 shown, when the first synchronizer 41 is in the upper position, it can be combined with the first transmission gear 352. When in the lower position, it can be combined with the second transmission gear 353. And when the first synchronizer 41 is in the middle position, the power of the first motor 21 is not output from the first input shaft 35. At this time, the range extender 25 can be in power connection with the first motor 21, so that the range extender 25 is used to drive the first motor 21 to operate and generate electricity.

[0046] In some embodiments, the first motor 21 is provided with a first motor gear 211, and the first input shaft 35 is provided with a first input gear 351. The first input gear 351 meshes with the first motor gear 211. Specifically, as Figure 1 shown, the first motor gear 211 is fixedly sleeved on the motor shaft of the first motor 21. When the first motor 21 rotates, the first motor gear 211 can rotate accordingly. At the same time, the meshing of the first motor gear 211 and the first input gear 351 can drive the first input gear 351 to rotate. Among them, the first input gear 351 and the first input shaft 35 are circumferentially fixedly connected, so that the first input gear 351 can drive the first input shaft 35 to rotate, thereby realizing the power output of the first motor 21.

[0047] Thus, by setting the transmission cooperation between the first motor gear 211 and the first input gear 351, not only can the power transmission from the first motor 21 to the first input shaft 35 be realized, but also the first motor 21 and the first input shaft 35 can be sequentially distributed in the longitudinal direction of the vehicle, so as to reasonably utilize the space in the longitudinal direction of the vehicle and avoid too compact structural installation in the transverse direction.

[0048] In some embodiments, the power transmission system 100 further includes a second input shaft 36. The second input shaft 36 is power-connected to the second motor 22. The second input shaft 36 is provided with a third transmission gear 362, a fourth transmission gear 363 and a second synchronizer 42. The second synchronizer 42 is used to power-connect the second input shaft 36 with the third transmission gear 362 or the fourth transmission gear 363. That is to say, the second motor 22 can transmit power to the second input shaft 36, and by switching the state of the second synchronizer 42, the power can be flexibly input from the second input shaft 36 to the third transmission gear 362 or the fourth transmission gear 363.

[0049] The second wheel shaft 32 is provided with a second output gear 321 that meshes with the third transmission gear 362. As Figure 1 shown, a second output gear 321 is sleeved outside the second wheel shaft 32. The second output gear 321 is in circumferential transmission cooperation with the second wheel shaft 32. In this way, when the second synchronizer 42 power-connects the third transmission gear 362 and the second input shaft 36, the power on the second motor 22 can be transmitted to the second wheel shaft 32 through the second input shaft 36, the third transmission gear 362, and the second output gear 321, and then the second wheel 12 can be driven to rotate independently. And, the differential 5 is provided with a differential gear 51 that meshes with the fourth transmission gear 363. As Figure 1As shown in the figure, a differential gear 51 is provided outside the housing of the differential 5. The differential gear 51 can mesh with the fourth transmission gear 363. The differential gear 51 and the housing of the differential 5 are an integral body. In this way, when the second synchronizer 42 connects the fourth transmission gear 363 with the second input shaft 36 for power transmission, the power on the second motor 22 can be transmitted to the differential 5 through the second input shaft 36, the fourth transmission gear 363, and the differential gear 51, and then be respectively transmitted from the differential 5 to the first wheel shaft 31 and the second wheel shaft 32 to realize the common drive of the first wheel 11 and the second wheel 12.

[0050] Therefore, the second motor 22 can cooperate with the third transmission gear 362, the fourth transmission gear 363, and the second synchronizer 42 on the second input shaft 36 to realize the switching of the power output state, and flexibly select to drive the first wheel 11 alone or drive the first wheel 11 and the second wheel 12 simultaneously. It should be noted that the second synchronizer 42 has three working positions. As Figure 1 shown in the figure, when the second synchronizer 42 is in the upper position, it can be combined with the fourth transmission gear 363. When in the lower position, it can be combined with the third transmission gear 362. And when the second synchronizer 42 is in the middle position, the power of the second motor 22 is not output from the second input shaft 36.

[0051] In some embodiments, the second motor 22 is provided with a second motor gear 221, and the second input shaft 36 is provided with a second input gear 361. The second input gear 361 meshes with the second motor gear 221. Specifically, as Figure 1 shown in the figure, the second motor gear 221 is fixedly sleeved on the motor shaft of the second motor 22. When the second motor 22 rotates, the second motor gear 221 can rotate accordingly. At the same time, the meshing of the second motor gear 221 and the second input gear 361 can drive the second input gear 361 to rotate. Among them, the second input gear 361 is circumferentially fixedly connected to the second input shaft 36, so that the second input gear 361 can drive the second input shaft 36 to rotate, thereby realizing the power output of the second motor 22.

[0052] Therefore, by setting the transmission cooperation between the second motor gear 221 and the second input gear 361, not only can the power transmission from the second motor 22 to the second input shaft 36 be realized, but also the second motor 22 and the second input shaft 36 can be sequentially distributed in the longitudinal direction of the vehicle, so as to reasonably utilize the space in the longitudinal direction of the vehicle and avoid too compact structural installation in the transverse direction.

[0053] In some embodiments, the axis of the first wheel shaft 31 coincides with the axis of the second wheel shaft 32. That is, the first wheel shaft 31 and the second wheel shaft 32 are arranged opposite to each other in the lateral direction of the vehicle. In other words, one of the first wheel shaft 31 and the second wheel shaft 32 can be set as the left front wheel shaft, and the other can be set as the right front wheel shaft, or one of the first wheel shaft 31 and the second wheel shaft 32 can be set as the left rear wheel shaft, and the other can be set as the right rear wheel shaft, that is, used to drive the two front wheels or the two rear wheels.

[0054] And the first motor 21 and the second motor 22 are respectively located on the front and rear sides of the second wheel shaft 32. Among them, the second wheel shaft 32 extends along the lateral direction of the vehicle. Thus, the first motor 21 can be located on the front side of the second wheel shaft 32, and the second motor 22 can be located on the rear side of the second wheel shaft 32, or the first motor 21 can be located on the rear side of the second wheel shaft 32, and the second motor 22 can be located on the front side of the second wheel shaft 32. Specifically, as Figure 1 shown, the first wheel shaft 31 is the right front wheel shaft, the second wheel shaft 32 is the left front wheel shaft, and the first motor 21 is located in front of the second wheel shaft 32, and the second motor 22 is located behind the second wheel shaft 32, so that the first motor 21 and the second motor 22 can respectively utilize the space in the front and rear directions of the second wheel shaft 32, making the arrangement of the first motor 21 and the second motor 22 relatively dispersed and not too compactly installed.

[0055] In some embodiments, the power transmission system 100 further includes an extender gear 251. The first motor 21 is connected with a first motor gear 211, and the first motor gear 211 meshes with the extender gear 251. Thus, the first motor 21 can realize the power connection with the extender 25 through the meshing transmission of the first motor gear 211 and the extender gear 251. In this way, when the extender 25 outputs driving force, the driving force can be transmitted to the first motor gear 211 through the extender gear 251, and then transmitted to the first motor 21 through the first motor gear 211 to drive the first motor 21 and further realize power generation.

[0056] Wherein, a clutch 43 is provided between the extender gear 251 and the extender 25, that is, the state of the clutch 43 can be switched to flexibly switch the connection state between the extender 25 and the extender gear 251. In other words, when driving the first motor 21 to generate electricity through the extender 25, the extender 25 and the extender gear 251 can be power-connected through the clutch 43, so that the power of the extender 25 can be output to the extender gear 251 and further transmitted to the first motor gear 211 and the first motor 21 to realize power generation. When it is not necessary to drive the first motor 21 to generate electricity through the extender 25, the extender 25 and the extender gear 251 are separated through the clutch 43, and the power between them is disconnected.

[0057] Thus, by meshing the range extender 25 with the first motor gear 211 through the range extender gear 251, not only can the range extender 25 be controlled to drive the first motor 21 for power generation, but also the power can be transmitted to the differential and the wheel half shafts through the first motor gear 211, realizing the drive of the vehicle by the engine and enriching the working modes.

[0058] In some embodiments, the third wheel 13 is connected to a third wheel shaft 33. The third wheel shaft 33 is provided with a third output gear 331, and the third motor 23 is provided with a third motor gear 231. The third motor gear 231 and the third output gear 331 are power-connected through a gear set. Among them, the third motor gear 231 is fixedly sleeved on the motor shaft of the third motor 23, so that the driving force output by the third motor 23 can be output to the third wheel shaft 33 through the third motor gear 231, the gear set, and the third output gear 331 in sequence, realizing the power output to the third wheel 13.

[0059] Among them, the gear set between the third motor gear 231 and the third output gear 331 may include a fifth transmission gear 332 and a sixth transmission gear 333. The fifth transmission gear 332 and the sixth transmission gear 333 are coaxially arranged, and the third motor gear 231 meshes with the fifth transmission gear 332, and the third output gear 331 meshes with the sixth transmission gear 333. By setting the power transmission of the fifth transmission gear 332 and the sixth transmission gear 333, the speed ratio change from the third motor gear 231 to the third output gear 331 can be realized, the adjustment of the power output of the third motor 23 can be realized, and the gear rotation direction from the third motor gear 231 to the third output gear 331 can be changed.

[0060] Moreover, the fourth wheel 14 is connected to a fourth wheel shaft 34. The fourth wheel shaft 34 is provided with a fourth output gear 341, and the fourth motor 24 is provided with a fourth motor gear 241. The fourth motor gear 241 and the fourth output gear 341 are power-connected through a gear set. Among them, the fourth motor gear 241 is fixedly sleeved on the motor shaft of the fourth motor 24, so that the driving force output by the fourth motor 24 can be output to the fourth wheel shaft 34 through the fourth motor gear 241, the gear set, and the fourth output gear 341 in sequence, realizing the power output to the fourth wheel 14.

[0061] Among them, the gear set between the fourth motor gear 241 and the fourth output gear 341 may include a seventh transmission gear 342 and an eighth transmission gear 343. The seventh transmission gear 342 and the eighth transmission gear 343 are coaxially arranged, and the fourth motor gear 241 meshes with the seventh transmission gear 342, and the fourth output gear 341 meshes with the eighth transmission gear 343. By setting the power transmission of the seventh transmission gear 342 and the eighth transmission gear 343, the speed ratio change from the fourth motor gear 241 to the fourth output gear 341 can be realized, the adjustment of the power output of the fourth motor 24 can be achieved, and the gear rotation direction from the fourth motor gear 241 to the fourth output gear 341 can be changed.

[0062] And in a further embodiment, the first wheel 11 and the second wheel 12 are both set as front wheels, the third wheel 13 and the fourth wheel 14 are both set as rear wheels, the first motor 21 and the second motor 22 can be used to drive the two front wheels to rotate, and the third motor 23 and the fourth motor 24 can be used to drive the two rear wheels to rotate.

[0063] Specifically, as Figure 1 shown, the first wheel 11 is a right front wheel, the second wheel 12 is a left front wheel, the third wheel 13 is a right rear wheel, and the fourth wheel 14 is a left rear wheel. Correspondingly, the first wheel axle 3131 is a right front wheel axle, the second wheel axle 32 is a left front wheel axle, the third wheel axle 33 is a right rear wheel axle, and the fourth wheel axle 34 is a left rear wheel axle.

[0064] Thus, the first motor 21 can be used to drive the right front wheel to rotate, and can also be used to cooperate with the range extender 25 to generate power. At the same time, the second motor 22 can be used to drive the left front wheel to rotate, and can also drive the left front wheel and the right front wheel to rotate simultaneously. The third motor 23 is used to drive the right rear wheel to rotate, and the fourth motor 24 is used to drive the left rear wheel to rotate. Thus, the four motors can be used to drive the four wheels to rotate respectively, with a simple structure and being beneficial to improving the vehicle's off-road ability.

[0065] In some embodiments, both the range extender 25 and the first motor 21 are located in front of the front wheel axle, and the second motor 22 is located between the front wheel axle and the rear wheel axle. That is, in this embodiment, both the first wheel axle 31 and the second wheel axle 32 are front wheel axles, the first wheel axle 31 is a right front wheel axle, and the second wheel axle 32 is a left front wheel axle. At the same time, both the third wheel axle 33 and the fourth wheel axle 34 are rear wheel axles, the third wheel axle 33 is a right rear wheel axle, and the fourth wheel axle 34 is a left rear wheel axle.

[0066] Thus, the range extender 25 and the first motor 21 are both located in the front area of ​​the vehicle, which is conducive to shortening the power transmission path between the first motor 21 and the first axle 31, and at the same time, the power transmission parts between the range extender 25 and the first motor 21 can be reduced, so as to realize the setting of effective power generation and driving. At the same time, the second motor 22 is located in the middle area of ​​the vehicle, so that the second motor 22 can maintain a shorter power path with the second axle 32, and the second motor 22 does not need to be compactly installed in the front area of ​​the vehicle with the range extender 25 and the first motor 21, so that the middle space of the vehicle is well utilized to avoid crowding in the front area of ​​the vehicle.

[0067] Furthermore, the third motor 23 and the fourth motor 24 are both located behind the rear axle. In other words, the third motor 23 and the fourth motor 24 are both located in the rear area of ​​the vehicle. This is not only conducive to reducing the distance between the third motor 23 and the third axle 33, but also reducing the distance between the fourth motor 24 and the fourth axle 34, and can better utilize the rear space of the vehicle. It is understandable that when the vehicle is actually arranged, a large number of in-vehicle structures are arranged in the middle space of the vehicle, while the rear area of ​​the vehicle is relatively empty. Therefore, locating the third motor 23 and the fourth motor 24 in the rear area of ​​the vehicle can make the weight of the entire vehicle relatively balanced in the front-to-back direction, and realize the reasonable arrangement of the positions of various components.

[0068] Therefore, in the present invention, by setting the above-mentioned power transmission system 100, four modes in which each motor works can be realized; 1) pure electric four-wheel drive mode, the first motor 21, the second motor 22, the third motor 23 and the fourth motor 24 drive the four wheels respectively, realize the functions of 4-wheel torque vector control, turning on the spot, etc., improve the vehicle's handling stability and off-road escape ability, and have good maneuverability; 2) extended-range mode, the first motor 21 is connected to the range extender 25 by power, the second motor 22 drives the two front wheels at the same time, and the third motor 23 and the fourth motor 24 drive the two rear wheels respectively; 3) parallel mode, the position of the clutch and the synchronizer is the same as in the pure electric four-wheel drive mode, and the engine can drive the right front wheel independently or drive the right front wheel together with the first motor; 4) engine direct drive mode, the engine is connected to the left and right half shafts of the vehicle at the same time, such as the power of the engine enters the differential, to achieve simultaneous driving of the wheels on both sides.

[0069] Furthermore, in some embodiments, a differential lock may be selectively provided on the rear axle, and similarly, a differential lock may also be provided on the front axle, so as to flexibly implement differential locking.

[0070] The present invention also provides a vehicle.

[0071] The vehicle according to the embodiment of the present invention is provided with the power transmission system 100 of any of the above embodiments. Figure 1As shown, the vehicle is provided with a left front wheel, a right front wheel, a left rear wheel and a right rear wheel. Among them, the first motor 21 and the range extender 25 can be selectively power-connected, and the first motor 21 can be selectively power-connected to the right front wheel, and the first motor 21 can also be selectively power-connected to the differential 5. At the same time, the second motor 22 can be selectively power-connected to the left front wheel, and the second motor 22 can also be selectively power-connected to the differential 5, so that the first motor 21 and the second motor 22 can be jointly used to drive the two front wheels to rotate. Moreover, the first motor 21 and the second motor 22 can both drive the left front wheel and the right front wheel to rotate simultaneously through the differential 5, so that when the first motor 21 is used to cooperate with the range extender 25 to generate electricity, the second motor 22 can drive the two front wheels to rotate simultaneously.

[0072] As Figure 1 As shown, the third motor 23 is power-connected to the right rear wheel through a gear set, and the fourth motor 24 is power-connected to the left rear wheel through a gear set, so that the third motor 23 and the fourth motor 24 can drive the two rear wheels to rotate simultaneously. Thus, independent drive of the four wheels can be achieved.

[0073] Thus, by setting the power transmission system 100, independent drive of each wheel can be achieved, which is beneficial to improving the vehicle's off-road ability, and the setting of a separate generator can be reduced. Moreover, when the first motor 21 generates electricity, effective drive of each wheel can still be ensured, guaranteeing the power performance of the vehicle during the power generation process.

[0074] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0075] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A power transmission system, characterized in that, comprising: a first wheel, a second wheel, a third wheel and a fourth wheel; a first motor and a second motor, the first motor being configured to be power-connected to the first wheel or simultaneously to the first wheel and the second wheel, and the second motor being configured to be power-connected to the second wheel or simultaneously to the first wheel and the second wheel; a range extender, the range extender being selectively power-connected to the first motor; a third motor and a fourth motor, the third motor being power-connected to the third wheel and the fourth motor being power-connected to the fourth wheel.

2. The power transmission system according to claim 1, characterized in that, further comprising a differential, the first wheel being connected to a first axle, the second wheel being connected to a second axle, and the differential being respectively power-connected to the first axle and the second axle; wherein, the first motor is selectively power-connected to the first axle and the differential, and the second motor is selectively power-connected to the second axle and the differential.

3. The power transmission system according to claim 2, characterized in that, further comprising a first input shaft, the first input shaft being power-connected to the first motor, the first input shaft being provided with a first transmission gear, a second transmission gear and a first synchronizer, and the first synchronizer being configured to power-connect the first input shaft to the first transmission gear or the second transmission gear; the first axle being provided with a first output gear meshing with the first transmission gear, and the differential being provided with a differential gear meshing with the second transmission gear; and / or, further comprising a second input shaft, the second input shaft being power-connected to the second motor, the second input shaft being provided with a third transmission gear, a fourth transmission gear and a second synchronizer, and the second synchronizer being configured to power-connect the second input shaft to the third transmission gear or the fourth transmission gear; the second axle being provided with a second output gear meshing with the third transmission gear, and the differential being provided with a differential gear meshing with the fourth transmission gear.

4. The power transmission system according to claim 3, characterized in that, the first motor is provided with a first motor gear, the first input shaft is provided with a first input gear, and the first input gear meshes with the first motor gear; and / or, the second motor is provided with a second motor gear, the second input shaft is provided with a second input gear, and the second input gear meshes with the second motor gear.

5. The power transmission system according to claim 2, characterized in that, the axis of the first axle coincides with the axis of the second axle, and the first motor and the second motor are respectively located on the front and rear sides of the first axle.

6. The power transmission system according to any one of claims 1-5, characterized in that, further comprising a range extension gear, the first motor being connected to a first motor gear, the first motor gear meshing with the range extension gear, and a clutch being provided between the range extension gear and the range extender.

7. The power transmission system according to any one of claims 1-5, It is characterized in that the third wheel is connected with a third wheel axle, the third wheel axle is provided with a third output gear, the third motor is provided with a third motor gear, and the third motor gear is power-connected with the third output gear through a gear set; the fourth wheel is connected with a fourth wheel axle, the fourth wheel axle is provided with a fourth output gear, the fourth motor is provided with a fourth motor gear, and the fourth motor gear is power-connected with the fourth output gear through a gear set.

8. The power transmission system according to any one of claims 1-5, It is characterized in that the first wheel and the second wheel are both set as front wheels, and the third wheel and the fourth wheel are both set as rear wheels.

9. The power transmission system according to claim 8, It is characterized in that the range extender and the first motor are both located in front of the front wheel axle, and the second motor is located between the front wheel axle and the rear wheel axle; and / or, the third motor and the fourth motor are both located behind the rear wheel axle.

10. A vehicle, It is characterized in that it is provided with the power transmission system according to any one of claims 1-9.

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