Power drive assembly and transport vehicle

Abstract

This application relates to the field of power drive technology, and more particularly to a power drive assembly and a transportation vehicle. The power drive assembly includes a drive power module, a range extender module, and a drive transmission module. The drive power module includes a first drive motor and a second drive motor coaxially arranged; the axes of both the first and second drive motors are arranged along a first direction. The drive transmission module includes a first transmission device coaxially connected to the first drive motor and a second transmission device coaxially connected to the second drive motor. The first and second drive motors are located between the first and second transmission devices. The range extender module includes an engine and a generator; the output shaft of the engine and the axis of the generator are both arranged along the first direction, and the engine and generator are parallel in the first direction. The range extender module and the drive power module are arranged parallel in a second direction, which is perpendicular to the first direction. The above-described power drive assembly has a compact structure and small size.

Description

Technical Field

[0001] This application relates to the field of power drive technology, and more specifically, to a power drive assembly and a transport vehicle. Background Technology

[0002] With the rapid iteration of new energy vehicle technology and the continuous improvement of users' requirements for vehicle range and handling performance, power drive systems that combine range extenders and distributed drive functions have gradually become the focus of industry research. Range extenders can use an internal combustion engine to drive a generator to replenish the battery, effectively solving the range anxiety of pure electric vehicles. Distributed drive can significantly improve the vehicle's handling and power response speed by independently controlling each drive wheel and precisely distributing torque through the motor. The combination of the two can achieve both long range and agile handling.

[0003] However, in related technologies, distributed drive systems already occupy a considerable amount of space due to the use of multiple drive motors that drive the corresponding wheels through reduction gears. When the aforementioned range extender is added to the power drive assembly, this type of power drive assembly, which integrates the range extender and distributed drive functions, must consider the overall layout of the range extender (such as whether the engine is placed longitudinally or laterally) in practical applications, and also reserve sufficient installation space for the distributed drive system to avoid interference between components. Therefore, it inevitably increases the complexity of the structural design and the difficulty of layout, resulting in a larger overall envelope size of the drive system. Utility Model Content

[0004] This application provides a power drive assembly and a transportation vehicle.

[0005] According to a first aspect of this application, embodiments of this application provide a power drive assembly, including a drive power module, a range extender module, and a drive transmission module. The drive power module includes a first drive motor and a second drive motor, the second drive motor being coaxially arranged with the first drive motor; the axes of both the first and second drive motors are arranged along a first direction. The drive transmission module includes a first transmission device and a second transmission device, the first transmission device being coaxially connected to the first drive motor; the second transmission device being coaxially connected to the second drive motor; in the first direction, the first and second drive motors are located between the first and second transmission devices. The range extender module includes an engine and a generator driveably connected to the engine, the output shaft of the engine and the axis of the generator being both arranged along the first direction, and the engine and generator being parallel in the first direction. The range extender module and the drive power module are arranged parallel in a second direction, the second direction being perpendicular to the first direction.

[0006] In some optional embodiments, the generator and engine are coaxially arranged, and the range extender module also includes a torsional damping device that is driven between the generator and the engine.

[0007] In some optional embodiments, the range extender module further includes a speed-up transmission device, which is driveably connected between the torsional damping device and the generator. The speed-up transmission device includes at least one of a planetary gear set mechanism and a parallel shaft gear mechanism. In some optional embodiments, the input shaft of the generator is directly connected to the torsional damping device.

[0008] In some alternative embodiments, the generator shaft is parallel to the engine output shaft, and the range extender module also includes a speed-up transmission device that is drive-connected between the engine and the generator. The speed-up transmission device includes at least one of a planetary gear set mechanism and a parallel shaft gear mechanism.

[0009] In some optional embodiments, the power drive assembly further includes a control module, which is electrically connected to the generator, the first drive motor, and the second drive motor, respectively; at least a portion of the structure of the control module is arranged parallel to the engine in a first direction.

[0010] In some optional embodiments, the control module and the drive power module are arranged side by side in the third direction and located on one side of the generator's radial direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other.

[0011] In some optional embodiments, the control module includes a first control unit and a second control unit connected to each other. The first control unit and the engine are arranged side by side in a first direction, and the second control unit and the engine are arranged side by side in a second direction.

[0012] In some optional embodiments, the power drive assembly further includes a housing module with a receiving space, in which a generator, a first drive motor, and a second drive motor are disposed, and an engine is disposed outside the receiving space and connected to the housing module.

[0013] In some optional embodiments, the control module is disposed within the accommodating space. The control module includes a three-motor integrated controller, which is electrically connected to the generator, the first drive motor, and the second drive motor, respectively. In other optional embodiments, the control module is disposed within the accommodating space and includes a generator controller and a drive motor integrated controller. The drive motor integrated controller is electrically connected to the first drive motor and the second drive motor, respectively, and the generator controller is electrically connected to the generator.

[0014] In some optional embodiments, the housing module includes a main housing, a generator end cover, and a controller end cover. A receiving space is disposed within the main housing. The main housing also has a first opening, a second opening, and a third opening communicating with the receiving space. The first and second openings are located at opposite ends of the main housing, and the third opening is disposed on the housing portion of the main housing between the first and second openings. The generator end cover is disposed at the first opening, and the generator is disposed adjacent to and connected to the generator end cover. The engine is disposed at the second opening and covers the second opening. The control module is disposed adjacent to the third opening, and the controller end cover covers the third opening.

[0015] In some optional embodiments, the control module is located outside the accommodating space. The control module includes a controller housing and a three-motor integrated controller disposed within the controller housing. The three-motor integrated controller is electrically connected to the generator, the first drive motor, and the second drive motor, respectively. The controller housing is fixedly connected to the housing module.

[0016] In some optional embodiments, the control module is located outside the accommodating space. The control module includes a controller housing and a generator controller and a drive motor integrated controller disposed within the controller housing. The drive motor integrated controller is electrically connected to the first drive motor and the second drive motor, respectively. The generator controller is electrically connected to the generator. The controller housing is fixedly connected to the housing module.

[0017] In some optional embodiments, the first transmission device is disposed at the end of the first drive motor away from the second drive motor, and the first transmission device includes at least one of a planetary reduction mechanism and a parallel shaft gear reduction mechanism. The second transmission device is disposed at the end of the second drive motor away from the first drive motor, and the second transmission device includes at least one of a planetary reduction mechanism and a parallel shaft gear reduction mechanism.

[0018] In some optional embodiments, the power drive assembly further includes a first housing, a second housing, and an end cover. A first drive motor and a second drive motor are disposed within the first housing. The second housing is disposed at one end of the first housing and connected to it, with its internal space communicating with the internal space of the first housing. A first transmission device and a generator are disposed within the second housing. The end cover is disposed at the end of the first housing opposite to the second housing and seals the internal space of the first housing. The second transmission device is installed within the end cover. The end cover, the first housing, and the second housing are arranged side-by-side along a first direction.

[0019] In some optional embodiments, the power drive assembly further includes a locking module disposed between the first drive motor and the second drive motor. The locking module is detachably connected between the first drive motor and the second drive motor so that the power of the first drive motor and the power of the second drive motor can be coupled.

[0020] In some optional embodiments, at least one of the first drive motor and the second drive motor is an axial flux motor. The axial flux motor includes a stator, a first rotor and a second rotor arranged coaxially. The stator is located between the first rotor and the second rotor. The first rotor and the second rotor are connected to the drive transmission module through an output shaft.

[0021] In some optional embodiments, at least one of the first drive motor and the second drive motor is an axial flux motor. The axial flux motor includes a rotor, a first stator and a second stator arranged coaxially. The rotor is located between the first stator and the second stator and is connected to the drive transmission module through an output shaft.

[0022] According to a second aspect of this application, embodiments of this application also provide a transport vehicle, including a body and a power drive assembly of any of the above, the power drive assembly being disposed on the body.

[0023] In the embodiments provided in this application, the first direction can be understood as the width direction of the transport vehicle, that is, the direction of the axis of the two coaxial wheels. The second direction can be understood as the length direction of the transport vehicle, that is, the direction of the line connecting the front and rear of the transport vehicle. Therefore, in the embodiments of this application, the engine axis is set along the first direction, which can be understood as a traditional "transverse engine", which can avoid occupying too much space in the length direction of the transport vehicle and compressing the space of the passenger compartment. At the same time, the generator axis is also set along the first direction, so that the generator axis is approximately parallel to or coincides with the engine axis. This allows the generator to be placed in the spare space at the end of the engine without excessively increasing the size of the range extender module in the first direction, thus meeting the current limitations on the width direction of vehicles.

[0024] Therefore, the range extender module can be considered as being arranged along the first direction. Based on this, the drive power module is arranged on one side of the range extender module, and the two are arranged side-by-side in the second direction. That is, the engine and generator are arranged side-by-side on the radial side of the first and second drive motors, so that the axial directions of the engine and generator are substantially parallel to the axial directions of the first and second drive motors, without excessively occupying space in the second direction. Therefore, in the power drive assembly provided in this application embodiment, under the current limitations of vehicle width dimensions, the space in the width direction (first direction) can be fully utilized to arrange the engine and generator. Simultaneously, the drive power module and range extender module are arranged along the length direction (second direction) of the transport vehicle, giving the power drive assembly a smaller length dimension, without encroaching on the space of the power battery pack, which is beneficial for a more flexible and spacious overall spatial layout of the transport vehicle. Furthermore, placing the first and second drive motors between the first and second transmission devices in the first direction allows full utilization of the space between the first and second transmission devices, achieving a layout of a distributed drive system that is as compact as possible, and also facilitates the assembly operation of the first and second drive motors. Based on this, the first drive motor and the second drive motor are coaxial, and both are coaxial with the first transmission device and the second transmission device. These axes are arranged along the first direction, which can avoid these components occupying additional space in the second direction. This helps to reduce the space occupied by the power drive assembly in the length direction of the transport vehicle, thereby reserving more space for the passenger compartment or battery compartment. Attached Figure Description

[0025] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 A schematic diagram of the structure of a transport vehicle provided in some embodiments of this application is shown.

[0027] Figure 2 It shows Figure 1 A schematic diagram of the power drive assembly of the transport vehicle shown.

[0028] Figure 3 It shows Figure 1 A schematic diagram of the end projection of the power drive assembly of the transport vehicle shown.

[0029] Figure 4 It shows Figure 1 A schematic diagram of the internal components of the power drive assembly of the transport vehicle shown.

[0030] Figure 5 It shows Figure 4 The diagram shows a structural schematic of a range extender module for the power drive assembly.

[0031] Figure 6 It shows Figure 4 This is another schematic diagram of the range extender module of the power drive assembly shown.

[0032] Figure 7 It shows Figure 4 The diagram shows a structural schematic of the drive power module of the power drive assembly.

[0033] Figure 8 It shows Figure 1 Another schematic diagram of the power drive assembly of the transport vehicle shown.

[0034] Figure 9 It shows Figure 1 This is another structural schematic diagram of the power drive assembly of the transport vehicle shown.

[0035] Figure 10 It shows Figure 1 A schematic diagram of the internal components and housing of the power drive assembly of the transport vehicle shown.

[0036] Figures 11 to 14 It shows Figure 10 The diagram shows end-face projections of various structures of the power drive assembly of the transport vehicle.

[0037] Figure 15 It shows Figure 10 The diagram shows the structural schematic of the power drive assembly of the transport vehicle.

[0038] Figure 16 It shows Figure 1 Another structural schematic diagram of the internal components and housing of the power drive assembly of the transport vehicle shown.

[0039] Figure 17 It shows Figure 2 The diagram shows a structural schematic of an axial flux motor in the power drive assembly shown.

[0040] Figure 18 It shows Figure 2 Another structural schematic diagram of the axial flux motor of the power drive assembly shown.

[0041] Label Explanation: 100 Powertrain 400 transport vehicles 10 Range extender module 401 body 12 engine 405 Driving system 14 dynamo 407 Power battery pack 16 Torsional damping device 409 tank 18 Speed-up transmission device 521 First planetary support 30 Drive power module 522 First-level planetary gear 32 First drive motor 523 First and second level planetary gears 34 Second drive motor 524 First gear ring 50 Drive transmission module 525 First Sun Gear 52 First transmission device 801 storage space 54 Second transmission device 811 First shell 60 Control module 813 Second shell 61 Controller housing 541 Second planetary support 62 Three-motor integrated controller 542 Second-level planetary gear 63 Generator controller 543 Second and second-level planetary gears 64 Drive motor integrated controller 544 Second gear ring 68 First Control Department 545 Second Sun Gear 69 Second Control Unit 8011 First opening 70 Locking module 8013 Second opening 80 housing module 8015 Third opening 81 main housing X Second direction 82 Generator end cover Y First direction 83 Controller end cover Z Third direction 91 stator 94 Rotor 92 First rotor 95 First stator 93 Second rotor 96 Second stator Detailed Implementation

[0042] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative effort are within the scope of protection of the present application.

[0043] If certain terms are used in the specification and claims to refer to specific components, those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. The specification and claims do not distinguish components based on differences in name, but rather on differences in function. For example, the term "comprising" used throughout the specification and claims is an open-ended term and should be interpreted as "including but not limited to"; "generally" means that those skilled in the art can solve the technical problem and basically achieve the technical effect within a certain margin of error.

[0044] In this application, unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or merely surface contact. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0046] The power drive assembly and transport vehicle proposed in this application will be further described below with reference to specific embodiments and accompanying drawings.

[0047] Please see Figure 1 This application provides a power drive assembly 100 and a transport vehicle 400 configured with the power drive assembly 100.

[0048] The transport vehicle 400 may include a body 401 and the aforementioned power drive assembly 100. The body 401 is provided with a passenger compartment for providing seating space, and the power drive assembly 100 is disposed within the body 401. The specific structure of the transport vehicle 400 is not limited to this application specification; it may be a land vehicle, a water vehicle, an air vehicle, or an amphibious or triphibious vehicle, etc. In these cases, the power drive assembly 100 provides the power for the transport vehicle 400 to move. Specifically, the transport vehicle 400 may also include a driving system 405, which is connected to the power drive assembly 100. The driving system 405 may include at least one mechanism such as wheels, a flight propeller, or a marine propeller to realize the driving function of the transport vehicle 400. Specifically, in this application specification, the transport vehicle 400 is described using a car as an example, which can be a range-extended electric vehicle. In this case, the driving system 405 includes multiple wheels.

[0049] In some embodiments, the transport vehicle 400 may further include a power battery pack 407, which is electrically connected to the power drive assembly 100, for example, via a high-voltage cable. The power drive assembly 100 converts the electrical energy input from the power battery pack 407 into mechanical energy, thereby inputting driving motion into the driving system 405. In some embodiments, the transport vehicle 400 may further include a fuel tank 409, which is connected to the engine in the power drive assembly 100 via a fuel line to supply fuel to the engine. The engine converts the heat energy from fuel combustion into mechanical energy; the engine may be a diesel engine, a gasoline engine, an alcohol engine, or other types of engine.

[0050] Please also refer to Figure 2 and Figure 3In this embodiment, the power drive assembly 100 includes a range extender module 10, a drive power module 30, and a drive transmission module 50. The drive power module 30 includes a first drive motor 32 and a second drive motor 34. The second drive motor 34 can be coaxially arranged with the first drive motor 32; for example, the second drive motor 34 can be located at one end of the first drive motor 32 along its axial direction. The axes of both the first drive motor 32 and the second drive motor 34 are arranged along a first direction Y. The drive transmission module 50 includes a first transmission device 52 and a second transmission device 54. The first transmission device 52 is coaxially connected to the first drive motor 32. The second transmission device 54 is coaxially connected to the second drive motor 34. In the first direction Y, the first drive motor 32 and the second drive motor 34 are located between the first transmission device 52 and the second transmission device 54. The range extender module 10 includes an engine 12 and a generator 14 connected to the engine 12. The output shaft of the engine 12 and the axis of the generator 14 are both arranged along the first direction Y, and the engine 12 and the generator 14 are parallel in the first direction Y. The range extender module 10 and the drive power module 30 are arranged side by side in the second direction X, which is perpendicular to the first direction Y.

[0051] In this embodiment, the first direction Y can be understood as the width direction of the transport vehicle 400, that is, the axis direction of the two coaxial wheels. The second direction X can be understood as the length direction of the transport vehicle 400, that is, the direction of the line connecting the front and rear of the transport vehicle 400. Therefore, in this embodiment, the axis of the engine 12 is set along the first direction Y, which can be understood as a traditional "transverse engine", which can avoid occupying too much space in the length direction of the transport vehicle 400 and compressing the space of the passenger compartment. Furthermore, the axis of the generator 14 is set along the first direction Y, so that the axis of the generator 14 is approximately parallel or coincident with the axis of the engine 12. The extra space at the end of the engine 12 can be used to place the generator 14, without excessively increasing the size of the range extender module 10 in the first direction Y, thus meeting the current vehicle width dimension limitations.

[0052] Therefore, the range extender module 10 can be considered as being arranged along the first direction Y. Based on this, the drive power module 30 and the drive transmission module 50 are arranged on one side of the range extender module 10, and the two are arranged side by side in the second direction X. That is, the engine 12 and the generator 14 are arranged side by side on the radial side of the first drive motor 32 and the second drive motor 34, so that the axial direction of the engine 12 and the generator 14 can be basically parallel to the axial direction of the first drive motor 32 and the second drive motor 34, and will not occupy too much space in the second direction X. Therefore, in the power drive assembly 100 provided in this application embodiment, under the current vehicle width dimension limitation, the space in the width direction (first direction Y) can be fully utilized to arrange the engine 12 and the generator 14. At the same time, the drive power module 30 and the range extender module 10 are arranged along the length direction (second direction X) of the transport vehicle 400, so that the power drive assembly 100 has a smaller length dimension, does not encroach on the space of the power battery pack 407, and is conducive to a more spacious and flexible overall spatial layout of the transport vehicle 400. Furthermore, positioning the first drive motor 32 and the second drive motor 34 in the first direction Y, between the first transmission device 52 and the second transmission device 54, fully utilizes the space between them, achieving a layout of the most compact distributed drive system possible. This also facilitates the assembly of the first drive motor 32 and the second drive motor 34. Based on this, the first drive motor 32 and the second drive motor 34 are coaxial, and both are coaxial with the first transmission device 52 and the second transmission device 54. Since these axes are arranged along the first direction Y, these components avoid occupying additional space in the second direction X. This helps reduce the space occupied by the power drive assembly 100 along the length of the transport vehicle 400, thus reserving more space for the passenger compartment or battery compartment.

[0053] It should be understood that the statement in this application that a component A and another component B are "arranged side by side in a certain direction" should be interpreted broadly, and not merely as meaning that the geometric centers of components A and B must lie on the same straight line extending along that certain direction. The broad interpretation should be that components A and B are arranged sequentially in roughly the same direction—not strictly limited to being arranged on the same straight line—and that when projected onto a plane perpendicular to that direction, the projections of components A and B have overlapping portions. For example, the statement that the first drive motor 32 and the second drive motor 34 are arranged side by side along the first direction Y should not be narrowly interpreted as meaning that the axes of the first drive motor 32 and the second drive motor 34 lie on the same straight line and both extend along the first direction Y. Rather, it should be understood that when projected onto a plane perpendicular to the first direction Y, the projections of the first drive motor 32 and the second drive motor 34 have overlapping portions, not limited to complete overlap, nor should it be limited to overlapping projections of their rotation axis centers. In fact, the first drive motor 32 and the second drive motor 34 can also be slightly offset in the first direction Y. Similarly, features such as the engine 12 and generator 14 being arranged side by side in the first direction Y, and the range extender module 10 and drive power module 30 being arranged side by side in the second direction X, including similar side-by-side features that will appear below, should also be interpreted in the above general sense, and will not be elaborated upon in this specification.

[0054] Please see Figure 4In some embodiments, the first drive motor 32 and the second drive motor 34 are coaxially arranged, which facilitates the integrated installation of the first drive motor 32 and the second drive motor 34 within the overall housing of the power drive assembly 100. This allows for higher space utilization within the overall housing, thereby achieving miniaturization of the power drive assembly 100, as will be described in detail below. As an example, the generator 14 is located on one side of the first drive motor 32 in the radial direction, and the axis of the generator 14 is substantially parallel to the axis of the first drive motor 32. The engine 12 is located on one side of the second drive motor 34 in the radial direction, and the output shaft of the engine 12 is substantially parallel to the axis of the second drive motor 34. By setting the corresponding positional relationship of the above-mentioned components, this embodiment defines the parallel or coaxial relationship of the axes of the first drive motor 32, the second drive motor 34, the generator 14, and the engine 12. This allows the axes of these components to extend along the first direction Y, without occupying additional space in the second direction X, thereby minimizing the size occupied by these components in the second direction X. As another example, if the generator 14 or engine 12 is large in size, or if the distance between the generator 14 and engine 12 is large, the first drive motor 32 can be located on one side of the output shaft of the engine 12 in the radial direction, instead of on one side of the generator 14 in the radial direction. In this case, the generator 14 and the first drive motor 32 do not need to be aligned in the second direction X. In this case, the second drive motor 34 is also located on one side of the output shaft of the engine 12 in the radial direction, which is beneficial to the overall compact structure of the power drive module 30.

[0055] Please see Figure 5 Furthermore, the generator 14 and engine 12 can be coaxially arranged, which facilitates close contact between the generator 14 and engine 12, thereby reducing the size / space occupied by them in the first direction Y and the second direction X. In this embodiment, a transmission device may be provided between the generator 14 and engine 12 or not (for example, their shafts may be directly connected). As an example, the range extender module 10 also includes a torsional damping device 16, which is drive-connected between the generator 14 and engine 12. The torsional damping device 16 is used to reduce the torsional stiffness between the crankshaft of engine 12 and generator 14, which can effectively reduce the tilt and sway of the transport vehicle 400 during operation. The torsional damping device 16 may include springs, dampers, and rotating components, which can reduce or suppress the transmission of vibration by means of torsion and deformation, in conjunction with the friction and damping effect of the damper, thereby improving the stability and durability of the structure. In this embodiment, the torsional damping device 16 can be bolted to the flywheel of engine 12.

[0056] In some examples, a transmission device may not be provided between the generator 14 and the engine 12. The input shaft of the generator 14 is directly connected to the torsional damping device 16, thus directly connecting to the engine 12. By directly coaxially connecting the generator 14 and the engine 12, the generator 14 and the engine 12 can be placed close together, thereby reducing the size / space occupied by them in the first direction Y. At the same time, by utilizing the difference in height between the engine 12 and the generator 14 in the height direction (third direction Z) of the transport vehicle 400, space can be freed up on top of the generator 14 to place other components, such as electric drive control devices, which is beneficial for forming a compact layout.

[0057] In other examples, the range extender module 10 may also include a speed-up transmission 18, which is driveably connected between the torsional damping device 16 and the generator 14 to increase the rotational speed of the input shaft of the generator 14. Specifically, the speed-up transmission 18 may include at least one of a planetary gear set mechanism and a parallel shaft gear mechanism.

[0058] exist Figure 5In the illustrated embodiment, the speed-up transmission device 18 includes a planetary gear set mechanism, which is coaxially arranged with the engine 12 and the generator 14. The planetary gear set mechanism includes a planet carrier 181, a ring gear 182, planet gears 183, and a sun gear 184. The sun gear 184 is coaxially connected to the input shaft of the generator 14. The planet carrier 181 is rotatably mounted and connected to a torsional damping device 16. For example, the planet carrier 181 is splined to the torsional damping device 16 and is driven to rotate by the torsional damping device 16. The planet carrier 181 surrounds the outer periphery of the sun gear 184. The ring gear 182 is fixedly mounted and surrounds the outer periphery of the planet carrier 181. The planet gears 183 are movably engaged with the planet carrier 181 and mesh between the ring gear 182 and the sun gear 184. When the torsional damping device 16 rotates, the planet carrier 181 drives the planet gears 183 and the sun gear 184 to rotate, thereby driving the input shaft of the generator 14 to rotate. This embodiment employs a planetary gear set mechanism as the transmission between the generator 14 and the engine 12, achieving high transmission efficiency and thus high power generation efficiency for the generator 14. Furthermore, the planetary gear set mechanism can be configured to be coaxial with both the output shaft (crankshaft) of the engine 12 and the generator 14. Compared to the problem of excessive radial dimensions caused by the offset of the generator and engine shafts in related technologies, the radial dimensions of the engine 12, generator 14, and planetary gear set mechanism in this embodiment can be minimized, avoiding excessive occupation of space in the length direction (second direction X) of the transport vehicle 400. This allows the generator 14, planetary gear set mechanism, and engine 12 to be placed close together, thereby reducing the size / space occupied by the three components in the second direction X. Simultaneously, utilizing the dimensional difference between the engine 12 and the planetary gear set structure in the height direction (third direction Z) of the transport vehicle 400, space can be freed up on top of the planetary gear set structure to place other components, such as electric drive control devices, facilitating a compact layout.

[0059] exist Figure 6 In the illustrated embodiment, the speed-up transmission device 18 includes a parallel shaft gear mechanism. The parallel shaft gear mechanism includes a speed-up driving gear 185 and a speed-up driven gear 186. The speed-up driving gear 185 is rotatably mounted and coaxially connected to the torsional damping device 16, while the speed-up driven gear 186 is coaxially connected to the input shaft of the generator 14 and meshes with the speed-up driving gear 185. Therefore, in this embodiment, the axis of the generator 14 is parallel to the output shaft of the engine 12, but they are offset. Using a parallel shaft gear mechanism as the transmission between the generator 14 and the engine 12 simplifies its structure and installation, which helps to reduce costs to some extent.

[0060] In other embodiments, the speed-up transmission device 18 may include both the parallel shaft gear mechanism and the planetary gear set mechanism described above, which will not be repeated here. Of course, in other embodiments, to achieve a configuration where the axis of the generator 14 is parallel to the output shaft of the engine 12, the parallel shaft gear mechanism may also include other transmission gears. For example, one or more intermediate transmission gears may be added between the speed-up driving gear 185 and the speed-up driven gear 186, ensuring that the speed-up transmission device 18 meets the speed-up transmission ratio while maintaining the parallelism between the axis of the generator 14 and the output shaft of the engine 12. In other embodiments, to achieve a configuration where the axis of the generator 14 is offset from the output shaft of the engine 12, the planetary gear set mechanism may also include other transmission gears. For example, one or more intermediate transmission gears may be added to the front or rear end of the planetary gear set mechanism, ensuring that the speed-up transmission device 18 meets the speed-up transmission ratio while maintaining the offset between the axis of the generator 14 and the output shaft of the engine 12.

[0061] Please see Figure 7In some embodiments, the drive transmission module 50 is driveably connected between the drive power module 30 and the driving system 405, and is used for acceleration or deceleration. The first transmission device 52 and the second transmission device 54 of the drive transmission module 50 are respectively disposed on both sides of the drive power module 30. Specifically, the first transmission device 52 is disposed at the end of the first drive motor 32 away from the second drive motor 34 and is connected to the shaft of the first drive motor 32. The second transmission device 54 is disposed at the end of the second drive motor 34 away from the first drive motor 32 and is connected to the shaft of the second drive motor 34. In this embodiment, the first drive motor 32 and the second drive motor 34 drive the two wheels respectively, forming a distributed motor drive architecture, which can provide greater driving force and driving torque. The first drive motor 32 and the second drive motor 34 are arranged laterally (along the first direction Y). Based on this, the first transmission device 52 and the second transmission device 54 are respectively arranged at the two ends of the drive power module 30, taking advantage of the extra space at both ends of the first direction Y inherent in the distributed motor drive architecture itself. Compared with the longitudinal engine and motor schemes of related technologies, with other components of the same type (e.g., battery, frame, suspension, steering gear, and wheel specifications are basically the same), the drive transmission module 50 and the drive power module 30 of this embodiment are arranged laterally, with smaller dimensions in the second direction X (length direction). In the second direction X, it does not need to occupy or occupies very little space in the power battery pack 407 or the front suspension, and also frees up more space for the passenger compartment. Furthermore, in this embodiment, the drive transmission module 50 and the drive power module 30 can be installed close to the engine 12 in the second direction X. The dimensional difference between the drive transmission module 50 and the drive power module 30 and the engine 12 in the height direction (third direction Z) can be used to free up space on top of the drive transmission module 50 and / or the drive power module 30 to place other components, such as electric drive control devices, which is beneficial to forming a compact layout.

[0062] As an example, the first transmission device 52 may include at least one of a planetary reduction mechanism and a parallel shaft gear reduction mechanism.

[0063] For example, if the first transmission device 52 includes a parallel shaft gear reduction mechanism, the parallel shaft gear reduction mechanism may include a first input shaft assembly, a first intermediate shaft assembly, and a first output shaft assembly (none shown in the figure). The first input shaft assembly is connected to the output end of the first drive motor 32, the first intermediate shaft assembly meshes with the first input shaft assembly, and the first output shaft assembly meshes with the first intermediate shaft assembly. The first input shaft assembly, the first intermediate shaft assembly, and the first output shaft assembly may each have their own axis, and the axes of the three are parallel to each other and not coplanar. Each of the three includes one or more transmission gears, thereby constituting a parallel shaft gear reduction mechanism.

[0064] For example, in Figure 7 In the illustrated embodiment, when the first transmission device 52 includes a planetary reduction mechanism, the planetary reduction mechanism of the first transmission device 52 can be a two-stage planetary reduction structure, which may include a first planet carrier 521, a first-stage planetary gear 522, a first-stage planetary gear 523, a first ring gear 524, and a first sun gear 525. The first sun gear 525 is coaxially connected to the output shaft of the first drive motor 32, and the first planet carrier 521 is sleeved on the outer periphery of the first sun gear 525. The first ring gear 524 surrounds the outer periphery of the first planet carrier 521. The first-stage planetary gear 522 is rotatably engaged with the first planet carrier 521 and meshes with the first sun gear 525. The first-stage planetary gear 523 is coaxially connected to the first-stage planetary gear 522 and rotatably engaged with the first planet carrier 521. The number of teeth of the first-stage planetary gear 523 is less than the number of teeth of the first-stage planetary gear 522, and the first-stage planetary gear 523 also meshes with the first ring gear 524. When the first drive motor 32 rotates, it drives the first planetary carrier 521 to rotate via the first sun gear 525, the first first-stage planetary gear 522, and the first second-stage planetary gear 523. The shaft of the first planetary carrier 521 is connected to one of the wheels in the driving system 405, thereby driving that wheel to rotate. In this embodiment, a planetary reduction mechanism is used as the output transmission of the first drive motor 32, which has the advantages of high transmission efficiency and uniform force distribution. In other embodiments, a parallel shaft gear reduction mechanism can be used as the output transmission of the first drive motor 32. The parallel shaft gear reduction mechanism can include multiple gears meshing in sequence, which will not be described in detail here. In other embodiments, the first transmission device 52 can simultaneously include the planetary reduction mechanism and the parallel shaft gear reduction mechanism of the above embodiments to obtain a more efficient reduction system. In this case, the planetary reduction mechanism can be driven between the first drive motor 32 and the parallel shaft gear reduction mechanism, or the parallel shaft gear reduction mechanism can be driven between the first drive motor 32 and the planetary reduction mechanism.

[0065] As an example, the second transmission device 54 may include at least one of a planetary reduction mechanism and a parallel shaft gear reduction mechanism.

[0066] For example, if the second transmission device 54 includes a parallel shaft gear reduction mechanism, the parallel shaft gear reduction mechanism may include a second input shaft assembly, a second intermediate shaft assembly, and a second output shaft assembly (none shown in the figure). The second input shaft assembly is connected to the output end of the second drive motor 34, the second intermediate shaft assembly meshes with the second input shaft assembly, and the second output shaft assembly meshes with the second intermediate shaft assembly. The second input shaft assembly, the second intermediate shaft assembly, and the second output shaft assembly may each have their own axis, and the axes of the three are parallel to each other and not coplanar. Each of the three includes one or more transmission gears, thereby constituting a parallel shaft gear reduction mechanism.

[0067] For example, in Figure 7 In the illustrated embodiment, the second transmission device 54 includes a planetary reduction mechanism, which can be a two-stage planetary reduction structure. This mechanism may include a second planet carrier 541, a second-stage planetary gear 542, a second-stage planetary gear 543, a second ring gear 544, and a second sun gear 545. The second sun gear 545 is coaxially connected to the output shaft of the second drive motor 34, and the second planet carrier 541 is fitted around the outer circumference of the second sun gear 545. The second ring gear 544 surrounds the outer circumference of the second planet carrier 541. The second-stage planetary gear 542 rotatably engages with the second planet carrier 541 and meshes with the second sun gear 545. The second-stage planetary gear 543 is coaxially connected to the second-stage planetary gear 542 and rotatably engages with the second planet carrier 541. The number of teeth on the second-stage planetary gear 543 is less than the number of teeth on the second-stage planetary gear 542, and the second-stage planetary gear 543 also meshes with the second ring gear 544. When the second drive motor 34 rotates, it drives the second planetary carrier 541 to rotate via the second sun gear 545, the second first-stage planetary gear 542, and the second second-stage planetary gear 543. The shaft of the second planetary carrier 541 is connected to one of the wheels in the driving system 405, thereby driving that wheel to rotate. In this embodiment, a planetary reduction mechanism is used as the output transmission of the second drive motor 34, which has the advantages of high transmission efficiency and uniform force distribution. In other embodiments, only a parallel shaft gear reduction mechanism can be used as the output transmission of the second drive motor 34. The parallel shaft gear reduction mechanism can include multiple gears meshing in sequence, which will not be described in detail here. In other embodiments, the second transmission device 54 can simultaneously include the planetary reduction mechanism and the parallel shaft gear reduction mechanism of the above embodiments to obtain a more efficient reduction system. In this case, the planetary reduction mechanism can be driven between the second drive motor 34 and the parallel shaft gear reduction mechanism, or the parallel shaft gear reduction mechanism can be driven between the second drive motor 34 and the planetary reduction mechanism.

[0068] In some embodiments, the power drive assembly 100 may further include a locking module 70 disposed between the first drive motor 32 and the second drive motor 34. The locking module 70 is detachably connected between the first drive motor 32 and the second drive motor 34 to couple the power of the first drive motor 32 and the second drive motor 34. It should be understood that "power coupling" as referred to in this specification should be understood as: achieving dynamic coordinated output of multiple power sources through a specific transmission mechanism, ensuring efficient synthesis and directional transmission of energy from multiple power sources in the spatiotemporal dimension, for example, enabling the torque / energy / speed of the first drive motor 32 and the second drive motor 34 to be output towards the same wheel axle of the driving system 405 through the locking module 70.

[0069] Specifically, when the transport vehicle 400 is in normal operation, the first drive motor 32 and the second drive motor 34, as distributed electric drives, drive the two wheels to rotate respectively, without power coupling between them. If the wheel corresponding to one of the motors, such as the first drive motor 32, slips (the wheel gets stuck on a low-traction surface, such as ice, mud, or sand), to avoid wasting the power output of the first drive motor 32, the locking module 70 can be connected between the first drive motor 32 and the second drive motor 34. This allows the power from both the first and second drive motors to be output to the wheel corresponding to the second drive motor 34, thereby increasing the torque of the wheel corresponding to the second drive motor 34. This facilitates quickly pushing the transport vehicle 400 out of the slippage situation, resulting in higher off-road performance for the transport vehicle 400.

[0070] In specific application examples, the locking module 70 can employ a mechanical locking mechanism, an electronic locking mechanism, or a combination thereof. Taking a mechanical locking mechanism as an example, the locking module 70 can include two rotatable locking gears. The end faces of the locking gears can be provided with splines for meshing. The two locking gears are respectively located at the ends of the shafts of the first drive motor 32 and the second drive motor 34 and are arranged opposite to each other. For example, when the first drive motor 32 increases its speed due to wheel slippage and reduced resistance, its corresponding locking gear will slide towards the other locking gear along the highly rotating shaft, thereby causing the two locking gears to mesh and creating a rigid connection between the ends of the shafts of the first drive motor 32 and the second drive motor 34. This transfers power from the slipping wheel to the other wheel, realizing torque transfer of the first drive motor 32. Taking the electronic locking mechanism as an example, the locking module 70 may include a rigid coupling structure and a speed sensor. For instance, when the first drive motor 32 increases its speed due to wheel slippage and reduced resistance, its corresponding speed sensor can detect that when the speed difference between the first drive motor 32 and the second drive motor 34 is greater than a preset value, the locking module 70, based on the detection result of the speed sensor, rigidly connects the shaft ends of the first drive motor 32 and the second drive motor 34 through the rigid coupling structure. Other examples of the locking module 70 are not described in detail in this specification.

[0071] Please see Figure 8 In some embodiments of this application, the power drive assembly 100 may further include a control module 60, which is electrically connected to the generator 14, the first drive motor 32, and the second drive motor 34, and is used to control the speed or power of the generator 14, the first drive motor 32, and the second drive motor 34.

[0072] In some embodiments, at least a portion of the structures of the control module 60 and the drive power module 30 are arranged side-by-side in the third direction Z, wherein the first direction Y, the second direction X, and the third direction Z are perpendicular to each other, and the third direction Z can be understood as the height direction of the transport vehicle 400. Further, the control module 60 is located on one radial side of the generator 14, utilizing the space formed by the dimensional difference between the engine 12 and the generator 14 in the height direction (third direction Z). Arranging the control module 60 in this space allows for a relatively compact overall structure of the power drive assembly 100, which is beneficial for reducing the overall volume of the power drive assembly 100 and facilitating the layout and installation of the power drive assembly 100's housing.

[0073] Furthermore, in this embodiment, at least a portion of the structure of the control module 60 and the engine 12 are arranged side-by-side in the first direction Y. This can be understood as the control module 60 being positioned at one end of the engine 12 along its axial direction, allowing the space at the end of the engine 12's output shaft to be used for mounting the control module 60, resulting in a more compact structural arrangement. When projected vertically towards a reference line O1 set along the third direction Z, the projection of the control module 60 and the projection of the engine 12 at least partially overlap. In short, when projected along the first direction Y, the projection of the control module 60 and the projection of the engine 12 at least partially overlap. In this embodiment, the projection line for the aforementioned vertical projection can be set along the first direction Y. That is, when projecting along the reference line O1, the projection of the engine 12 on the reference line O1 forms a line segment L1, and the projection of the control module 60 on the reference line O1 forms a line segment L2. L1 and L2 have at least partial overlap (for example, L1 covers part or all of L2). It can be seen that in the third direction Z, the space where the control module 60 and the engine 12 are located is reused. The two are not stacked along the third direction Z. This will not increase the size of the power drive assembly 100 in the third direction Z, making the structural layout of the power drive assembly 100 more compact, which is beneficial for miniaturization.

[0074] As an example, the control module 60 may be entirely parallel to the engine 12 in the first direction Y. For example, when projected along the first direction Y, the projection of the engine 12 may cover the projection of the control module 60.

[0075] As another example, please refer to Figure 9A portion of the structure of the control module 60 is parallel to the engine 12 in the first direction Y. Specifically, the control module 60 may include a first control unit 68 and a second control unit 69 connected to each other. The first control unit 68 and the engine 12 are arranged side by side in the first direction Y, and the second control unit 69 is arranged side by side with the engine 12 in the second direction X. In this example, the first control unit 68 and the second control unit 69 refer to different parts of the control module 60 in terms of its external structure, and do not mean that the control module 60 is divided into different functions. The first control unit 68 extends generally along the second direction X and is located at one end in the axial direction of the engine 12. The second control unit 69 is connected to one end of the first control unit 68 and extends relative to the first control unit 68 in the first direction Y, so that the structure of the control module 60 is generally "L" shaped. Therefore, in this example, the second control unit 69 is located on one side of the engine 12 in the second direction X. Furthermore, the second control unit 69 is arranged side by side with the drive transmission module 50 and / or the drive power module 30 in the third direction Z, so that the control module 60 is arranged around the outer periphery of the engine 12. This allows full use of the spare space around the engine 12, such as the space formed by the height difference between the engine 12 and the generator 14, and the space formed by the height difference between the engine 12 and the drive transmission module 50 and / or the drive power module 30. This enables effective use of space and makes the structural envelope of the power drive assembly 100 relatively small.

[0076] In some embodiments of this application, please refer to Figure 10 The power drive assembly 100 may further include a housing module 80, which has a receiving space 801. The generator 14, the first drive motor 32, and the second drive motor 34 are disposed within the receiving space 801, while the engine 12 is disposed outside the receiving space 801 and connected to the housing module 80. By enclosing the generator 14, the first drive motor 32, and the second drive motor 34 within the housing module 80, the modular integration of the power drive assembly 100 is facilitated. The above embodiments of this application provide a compact drive layout. Based on this, by using the same housing module 80 to install the aforementioned drive and transmission components, the installation structure of the power drive assembly 100 can be further simplified, making its structure more compact, while retaining the distributed drive motors.

[0077] In the embodiments of this application, the control module 60 may be disposed inside the housing module 80 or outside the housing module 80.

[0078] For example Figure 11In the illustrated embodiment, the control module 60 is located outside the accommodating space 801, which facilitates the installation and maintenance of the control module 60. As an example, the control module 60 may include a controller housing 61 and a three-motor integrated controller 62 disposed within the controller housing 61. The controller housing 61 is fixedly connected to the housing module 80 of the power drive assembly 100. The three-motor integrated controller 62 is electrically connected to the generator 14, the first drive motor 32, and the second drive motor 34, respectively. By setting the three-motor integrated controller 62 to control the generator 14, the first drive motor 32, and the second drive motor 34, a three-in-one control is achieved. This reduces the need for separate housings, connectors, and high-voltage wiring harnesses required for each motor controller, significantly reducing the size and weight of the control module 60, achieving relatively high power density / volume density / weight density, etc. It also further ensures a more compact structure for the power drive assembly 100 and facilitates the design of a cooling circuit with the three motors, reducing the difficulty of design and assembly.

[0079] As another example, such as Figure 12 As shown, the control module 60 may include a controller housing 61, a generator controller 63, and a drive motor integrated controller 64. The controller housing 61 is fixedly connected to the housing module 80 of the power drive assembly 100. The generator controller 63 and the drive motor integrated controller 64 are disposed within the controller housing 61. The drive motor integrated controller 64 is electrically connected to the first drive motor 32 and the second drive motor 34, respectively, and the generator controller 63 is electrically connected to the generator 14. In this example, by physically separating the generator 14 and the controllers of the two drive motors, a single point of failure (such as overheating) does not affect the operation of the drive power module 30. After a failure, the faulty controller can be replaced individually, reducing maintenance costs. Furthermore, the separate controller layout can reduce crosstalk of high-frequency switching signals and meet the stringent requirements of EMC electromagnetic interference.

[0080] For example Figure 13 In the embodiment shown, the control module 60 is disposed within the receiving space 801. The housing module 80 can be used as the outer shell of the control module 60, eliminating the need for an additional driver housing and complex wiring. This simplifies the materials, reduces installation costs to some extent, and improves the integration of the power drive assembly 100.

[0081] As an example, the control module 60 may include a three-motor integrated controller 62, which is electrically connected to the generator 14, the first drive motor 32, and the second drive motor 34 respectively. By setting up the three-motor integrated controller 62 to control the generator 14, the first drive motor 32, and the second drive motor 34, a three-in-one control is achieved. This reduces the need for separate housings, connectors, and high-voltage wiring harnesses required for each motor controller, further ensuring a more compact structure for the power drive assembly 100. It also facilitates the design of a cooling circuit with the three motors, reducing the difficulty of design and assembly.

[0082] As another example, such as Figure 14 As shown, the control module 60 may include a generator controller 63 and a drive motor integrated controller 64. The drive motor integrated controller 64 is electrically connected to the first drive motor 32 and the second drive motor 34, respectively, and the generator controller 63 is electrically connected to the generator 14. Both the generator controller 63 and the drive motor integrated controller 64 are located inside the housing module 80. In this example, by physically separating the controllers of the generator 14 and the two drive motors, a single point of failure (such as overheating) does not affect the operation of the drive power module 30. After a failure, the faulty controller can be replaced individually, reducing maintenance costs. Furthermore, the separate controller layout can reduce crosstalk of high-frequency switching signals and meet the stringent requirements of EMC electromagnetic interference.

[0083] Please also refer to Figure 10 and Figure 14 , Figure 15In some embodiments of this application, the housing module 80 may include a main housing 81, a generator end cover 82, and a controller end cover 83, with a receiving space 801 disposed inside the main housing 81. The main housing 81 also has a first opening 8011, a second opening 8013, and a third opening 8015 communicating with the receiving space 801. The first opening 8011 and the second opening 8013 are respectively located at opposite ends of the main housing 81, and the third opening 8015 is disposed on the housing portion of the main housing 81 between the first opening 8011 and the second opening 8013. Specifically, the first opening 8011 and the second opening 8013 are respectively located at both ends of the main housing 81 in the first direction Y, and their opening directions are respectively arranged along the first direction Y. The third opening 8015 can be located in the space between the plane of the first opening 8011 and the plane of the second opening 8013. The direction of the third opening 8015 is set along the third direction Z. Thus, when installed inside the transport vehicle 400, the third opening 8015 can be regarded as being located on the top surface of the main housing 81, and the first opening 8011 and the second opening 8013 are respectively located on the left and right sides of the main housing 81. The generator end cover 82 is covered by the first opening 8011, and the generator 14 is disposed adjacent to the first opening 8011 and connected to the generator end cover 82. The engine 12 is disposed at the second opening 8013 and covers the second opening 8013. The engine 12 can be bolted to the main housing 81. The control module 60 is disposed adjacent to the third opening 8015, and the controller end cover 83 covers the third opening 8015. In this embodiment, by setting the above-mentioned multiple opening mounting structure, it is convenient to install the control module 60 and the generator 14, and the housing module 80 can be closely attached to the engine 12, making the structure of the power drive assembly 100 more compact. It should be understood that the accompanying drawings are schematic diagrams made for ease of description only. These drawings are intended to show the general relative positions of the components, and the specific shapes of the housings, end caps, controllers, drive motors or generators shown should not limit the specific structure of the components in the embodiments of this application.

[0084] Based on the embodiments provided above in this specification, please refer to Figure 16In some embodiments of this application, the main housing 81 may include a first housing 811 and a second housing 813, which are used to mount the aforementioned motors, transmission mechanisms, etc. The housing module 80 may also include an end cover 84, with the end cover 84, the first housing 811, and the second housing 813 arranged side-by-side along a first direction Y. The second housing 813 is disposed at one end of the first housing 811 and connected to it. The internal space of the second housing 813 communicates with the internal space of the first housing 811 to facilitate transmission and power transfer between the aforementioned moving parts. The end cover 84 covers the end of the first housing 811 opposite to the second housing 813 and seals the internal space of the first housing 811. The first opening 8011 is located on the second housing 813, the second opening 8013 is located on the first housing 811, and the third opening 8015 may be located on either the first housing 811 or the second housing 813. The connection structures between the generator end cover 82, end cover shell 84, first shell 811 and second shell 813 can all be connected by threaded fasteners such as screws or bolts.

[0085] The first drive motor 32 and the second drive motor 34 are disposed within the first housing 811. For example, the stator of the first drive motor 32 is fixed to the first housing 811 by bolts or a heat-fitted interference fit, and the rotor of the first drive motor 32 is supported on the first housing 811 and the second housing 813 by bearings; the stator of the second drive motor 34 is fixed to the first housing 811 by bolts or a heat-fitted interference fit, and the rotor of the second drive motor 34 is supported on the first housing 811 and the end cover 84 by bearings. By disposing of the first drive motor 32 and the second drive motor 34 within the same housing, this embodiment improves integration and eliminates the need for separate housings in drive motors that are separately configured in related technologies, significantly reducing the space occupied by the first drive motor 32 and the second drive motor 34.

[0086] Furthermore, in some embodiments, the torsional damping device 16 and the locking module 70 are also disposed within the first housing 811. The torsional damping device 16 is located within the first housing 811 near the second opening 8013, utilizing the space within this area and facilitating connection to the engine 12. The locking module 70 can be fixedly disposed within the first housing 811 via a locking bracket, and is located in the spare space between the first drive motor 32 and the second drive motor 34, further maximizing space utilization within the first housing 811 and achieving a compact installation.

[0087] In some embodiments, the first transmission device 52 and the generator 14 are arranged side-by-side approximately along the second direction X, and both are housed within the second housing 813. For example, the stator of the generator 14 is mounted on the second housing 813 by bolts or a heat-shrink interference fit, and the rotor of the generator 14 is supported by bearings on the second housing 813 and the generator end cover 82. Furthermore, the speed-up transmission device 18 can also be housed within the second housing 813. Therefore, in this embodiment, the generator 14 and the speed-up transmission device 18 are arranged side-by-side approximately along the second direction X with the first transmission device 52, which effectively reduces the size occupied by the three in the first direction Y. The shared second housing 813 achieves a high space utilization rate and frees up space in the upper part of the third direction Z for installing the control module 60. In other embodiments, such as when the generator 14 or engine 12 is large or when the distance between the generator 14 and engine 12 is large, the first transmission device 52 and the engine 12 are arranged side by side approximately along the second direction X. For example, the first transmission device 52 may be located on one side of the output shaft of the engine 12 in the radial direction, rather than on one side of the generator 14 in the radial direction. In this case, the generator 14 and the first transmission device 52 do not need to be aligned in the second direction X. Combined with the structure of the second transmission device 54 being located on one side of the output shaft of the engine 12 in the radial direction, this makes the overall structure of the power drive module 30 more compact.

[0088] The second transmission device 54 is installed inside the end cover shell 84. Instead of squeezing the second transmission device 54 into the space-constrained first shell 811, it is installed inside the end cover shell 84. The end cover shell 84 is then installed as a whole inside the first shell 811 so that the second transmission device 54 and the second drive motor 34 are connected in transmission. This makes it easier to make the size of the first shell 811 smaller in the first direction Y and simplifies the installation of the second transmission device 54.

[0089] In some embodiments, at least one of the first drive motor 32 and the second drive motor 34 described above is an axial flux motor. For example, the first drive motor 32 can be an axial flux motor and the second drive motor 34 can be a radial flux motor; or, for example, the first drive motor 32 can be a radial flux motor and the second drive motor 34 can be an axial flux motor; or, for example, both the first drive motor 32 and the second drive motor 34 can be implemented using axial flux motors. By setting at least one of the first drive motor 32 and the second drive motor 34 as an axial flux motor, compared to the radial flux motor in the related art—where the torque of a radial flux motor is proportional to the square of its rotor radius—an axial flux motor can generate a torque proportional to the cube of its rotor radius, thereby obtaining a higher torque value. Therefore, under the same output power conditions, the volume of an axial flux motor is 50% smaller and its weight is 50% lighter than that of a radial flux motor. This advantage in size and weight allows for more economical use of materials. For example, they can be arranged in smaller spaces, such as in the recess of the wheel hub of wheel 405, thus simplifying the configuration of components such as the drive transmission module 50 and reducing kinetic energy loss. Consequently, the axial flux motor has higher drive efficiency and more direct torque compensation, resulting in better overall handling performance of the transport vehicle 400.

[0090] Please see Figure 17 As an example, the aforementioned axial flux motor may include a stator 91, a first rotor 92, and a second rotor 93 arranged coaxially. The stator 91 is located between the first rotor 92 and the second rotor 93. The first rotor 92 and the second rotor 93 are connected to the drive transmission module 50 via an output shaft. The first rotor 92 and the second rotor 93 may each include a plurality of circumferentially arranged permanent magnets 921. The stator 91 may include a plurality of circumferentially arranged coil windings 911. The magnetic field lines formed by these coil windings after energization are approximately parallel to the shaft of the axial flux motor. Of course, the axial flux motor may also include components such as an iron core, a shaft, and a bracket, which will not be elaborated in this embodiment. Based on the advantage of the axial flux motor having no yoke, this embodiment adopts a single stator structure. Especially when a segmented iron core is used, the amount of coil windings and iron core (e.g., silicon steel sheets) may be less, further reducing the weight of the axial flux motor. Furthermore, the axial flux motor in this embodiment has two rotors, which can output greater torque for the same volume or weight, and has higher power density and torque density. In a specific example, when the first drive motor 32 is an axial flux motor, the first rotor 92 and the second rotor 93 are connected to the first input shaft assembly 521 of the first transmission device 52 through the output shaft; when the second drive motor 34 is an axial flux motor, the first rotor 92 and the second rotor 93 are connected to the second input shaft assembly 541 of the second transmission device 54 through the output shaft.

[0091] Please see Figure 18 As another example, the aforementioned axial flux motor may include a rotor 94, a first stator 95, and a second stator 96 arranged coaxially. The rotor 94 is located between the first stator 95 and the second stator 96, and is connected to the drive transmission module 50 via an output shaft. The first stator 95 and the second stator 96 may each include multiple coil windings 951 arranged circumferentially in sequence. The magnetic field lines formed by these coil windings after energization are approximately parallel to the shaft of the axial flux motor. The rotor 94 may include multiple permanent magnets 941 arranged circumferentially in sequence. Of course, the axial flux motor may also include components such as an iron core, a shaft, and a bracket, which will not be elaborated in this embodiment. The axial flux motor in this embodiment has two stators located on both sides, which facilitates the arrangement of its cooling channels and makes thermal management more reliable. Furthermore, the rotor is arranged between the two stators, making the overall structure of the axial flux motor symmetrical, effectively counteracting axial magnetic pull, and resulting in relatively low operating noise. In a specific example, when the first drive motor 32 is an axial flux motor, the rotor 94 is connected to the first input shaft assembly 521 of the first transmission device 52 via the output shaft; when the second drive motor 34 is an axial flux motor, the rotor 94 is connected to the second input shaft assembly 541 of the second transmission device 54 via the output shaft.

[0092] In summary, by utilizing the structural features of the aforementioned housing module 80, and combining the placement and distribution of each component within the housing module 80, a highly compact power drive assembly 100 can be obtained. Since the power drive assembly 100 uses a first drive motor 32 and a second drive motor 34 to drive two wheels respectively, forming a distributed motor drive architecture, in a specific application example, the transport vehicle 400 can set the torque requests corresponding to the first drive motor 32 and the second drive motor 34 in the control module 60 according to the driving conditions of each wheel. Under control, the first drive motor 32 and the second drive motor 34 will then respond with the required torque output. The two drive motors can simultaneously output positive or negative torque, and the torque values ​​can be the same or different. Alternatively, one drive motor can output positive torque while the other outputs negative torque. Therefore, it not only enables the separate driving of the left or right wheel and the reasonable control of the torque requirements of the two wheels, but also enables pure electric drive and range-extending power generation for the transport vehicle 400. Furthermore, it significantly improves the range, NVH performance, and layout space requirements of the transport vehicle 400 for various vehicle models.

[0093] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A power drive assembly, characterized in that, This includes the drive power module, the range extender module, and the drive transmission module; The drive power module includes a first drive motor and a second drive motor, the second drive motor being coaxially arranged with the first drive motor; the axes of the first drive motor and the second drive motor are both arranged along a first direction; the drive transmission module includes a first transmission device and a second transmission device, the first transmission device being coaxially connected to the first drive motor; the second transmission device being coaxially connected to the second drive motor; in the first direction, the first drive motor and the second drive motor are located between the first transmission device and the second transmission device; The range extender module includes an engine and a generator connected to the engine via a transmission. The output shaft of the engine and the axis of the generator are both arranged along the first direction, and the engine and the generator are arranged side by side in the first direction. The range extender module and the drive power module are arranged side by side in a second direction, which is perpendicular to the first direction.

2. The power drive assembly as described in claim 1, characterized in that, The generator and the engine are coaxially arranged, and the range extender module also includes a torsional damping device, which is driven between the generator and the engine.

3. The power drive assembly as described in claim 2, characterized in that, The range extender module further includes a speed-up transmission device, which is driveably connected between the torsional damping device and the generator. The speed-up transmission device includes at least one of a planetary gear set mechanism and a parallel shaft gear mechanism; or... The input shaft of the generator is directly connected to the torsional damping device.

4. The power drive assembly as described in claim 1, characterized in that, The generator's axis is parallel to the engine's output shaft. The range extender module also includes a speed-up transmission device, which is connected between the engine and the generator. The speed-up transmission device includes at least one of a planetary gear set mechanism and a parallel shaft gear mechanism.

5. The power drive assembly as described in claim 1, characterized in that, The power drive assembly further includes a control module, which is electrically connected to the generator, the first drive motor, and the second drive motor, respectively; at least a portion of the structure of the control module is arranged side-by-side with the engine in the first direction.

6. The power drive assembly as described in claim 5, characterized in that, The control module and the drive power module are arranged side by side in a third direction and located on one side of the generator's radial direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other.

7. The power drive assembly as described in claim 5, characterized in that, The control module includes a first control unit and a second control unit connected to each other. The first control unit and the engine are arranged side by side in a first direction, and the second control unit and the engine are arranged side by side in a second direction.

8. The power drive assembly as described in claim 5, characterized in that, The power drive assembly also includes a housing module, which has an accommodating space. The generator, the first drive motor, and the second drive motor are disposed within the accommodating space, and the engine is disposed outside the accommodating space and connected to the housing module.

9. The power drive assembly as described in claim 8, characterized in that, The control module is disposed within the accommodating space. The control module includes a three-motor integrated controller, which is electrically connected to the generator, the first drive motor, and the second drive motor, respectively. or, The control module is disposed within the accommodating space. The control module includes a generator controller and a drive motor integrated controller. The drive motor integrated controller is electrically connected to the first drive motor and the second drive motor, respectively. The generator controller is electrically connected to the generator.

10. The power drive assembly as described in claim 9, characterized in that, The housing module includes a main housing, a generator end cover, and a controller end cover. The accommodating space is disposed in the main housing. The main housing is also provided with a first opening, a second opening, and a third opening that communicate with the accommodating space. The first opening and the second opening are respectively located at opposite ends of the main housing. The third opening is disposed on the housing portion of the main housing between the first opening and the second opening. The generator end cover is disposed over the first opening, and the generator is disposed adjacent to the first opening and connected to the generator end cover; The engine is positioned at the second opening and the second opening is sealed. The control module is located adjacent to the third opening, and the controller end cap covers the third opening.

11. The power drive assembly as described in claim 8, characterized in that, The control module is located outside the accommodating space. The control module includes a controller housing and a three-motor integrated controller disposed within the controller housing. The three-motor integrated controller is electrically connected to the generator, the first drive motor, and the second drive motor, respectively. The controller housing is fixedly connected to the housing module; or... The control module is located outside the accommodating space. The control module includes a controller housing and a generator controller and a drive motor integrated controller disposed within the controller housing. The drive motor integrated controller is electrically connected to the first drive motor and the second drive motor, respectively. The generator controller is electrically connected to the generator. The controller housing is fixedly connected to the housing module.

12. The power drive assembly as described in claim 1, characterized in that, The first transmission device is located at the end of the first drive motor away from the second drive motor, and the first transmission device includes at least one of a planetary reduction mechanism and a parallel shaft gear reduction mechanism. The second transmission device is located at the end of the second drive motor away from the first drive motor, and the second transmission device includes at least one of a planetary reduction mechanism and a parallel shaft gear reduction mechanism.

13. The power drive assembly as described in claim 12, characterized in that, The powertrain also includes: A first housing, wherein the first drive motor and the second drive motor are disposed within the first housing; A second housing is disposed at one end of the first housing and connected to the first housing; the internal space of the second housing communicates with the internal space of the first housing; the first transmission device and the generator are disposed within the second housing; and An end cap is provided on the end of the first housing opposite to the second housing and seals the internal space of the first housing; the second transmission device is installed inside the end cap; wherein the end cap, the first housing, and the second housing are arranged side by side along the first direction.

14. The power drive assembly as described in any one of claims 1 to 13, characterized in that, The power drive assembly also includes a locking module, which is disposed between the first drive motor and the second drive motor. The locking module is detachably connected between the first drive motor and the second drive motor so that the power of the first drive motor and the power of the second drive motor can be coupled.

15. The power drive assembly as described in any one of claims 1 to 13, characterized in that, At least one of the first drive motor and the second drive motor is an axial flux motor. The axial flux motor includes a stator, a first rotor and a second rotor arranged coaxially. The stator is located between the first rotor and the second rotor. The first rotor and the second rotor are connected to the drive transmission module through an output shaft. or At least one of the first drive motor and the second drive motor is an axial flux motor. The axial flux motor includes a rotor, a first stator and a second stator arranged coaxially. The rotor is located between the first stator and the second stator and is connected to the drive transmission module through an output shaft.

16. A transport vehicle, characterized in that, include: Organism; The power drive assembly as described in any one of claims 1 to 15 is disposed in the body.

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